Patent Application
20240196431
The present application claims priority to Indian Provisional Patent Application No. 202141020670, filed May 6, 2021, titled “A SINGULAR/DIFFERENTIAL STATISTICAL APPROACH FOR NARROW BEAM-BASED CHANNEL ACCESS,” which is hereby incorporated by reference in its entirety as if fully set forth below and for all applicable purposes.
This application relates to wireless communication systems, and more particularly to narrow beam-based channel access for communications in a wireless communication network operating over an unlicensed spectrum.
Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). A wireless multiple-access communications system may include a number of base stations (BSs), each simultaneously supporting communications for multiple communication devices, which may be otherwise known as user equipment (UE).
To meet the growing demands for expanded mobile broadband connectivity, wireless communication technologies are advancing from the long term evolution (LTE) technology to a next generation new radio (NR) technology, which may be referred to as 5th Generation (5G). For example, NR is designed to provide a lower latency, a higher bandwidth or a higher throughput, and a higher reliability than LTE. NR is designed to operate over a wide array of spectrum bands, for example, from low-frequency bands below about 1 gigahertz (GHz) and mid-frequency bands from about 1 GHz to about 6 GHz, to high-frequency bands such as millimeter wave (mmWave) bands. NR is also designed to operate across different spectrum types, from licensed spectrum to unlicensed and shared spectrum. Spectrum sharing enables operators to opportunistically aggregate spectrums to dynamically support high-bandwidth services. Spectrum sharing can extend the benefit of NR technologies to operating entities that may not have access to a licensed spectrum.
One approach to avoiding collisions when communicating in a shared spectrum or an unlicensed spectrum is to use a listen-before-talk (LBT) procedure to ensure that the shared channel is clear before transmitting a signal in the shared channel. For example, a transmitting node may listen to the channel to determine whether there are active transmissions in the channel. When the channel is idle, the transmitting node may transmit a preamble to reserve a transmission opportunity (TXOP) in the shared channel and may communicate with a receiving node during the TXOP. As use cases and diverse deployment scenarios continue to expand in wireless communication, channel access technique improvements may also yield benefits.
The following summarizes some aspects of the present disclosure to provide a basic understanding of the discussed technology. This summary is not an extensive overview of all contemplated features of the disclosure and is intended neither to identify key or critical elements of all aspects of the disclosure nor to delineate the scope of any or all aspects of the disclosure. Its sole purpose is to present some concepts of one or more aspects of the disclosure in summary form as a prelude to the more detailed description that is presented later.
In one aspect of the disclosure, a method of wireless communication performed by a first wireless communication device, the method includes receiving, from a second wireless communication device, one or more signals associated with a beam parameter; determining, at each of a plurality of locations, a signal measurement for at least one received signal of the one or more received signals; and determining, based at least in part on an p-th percentile signal measurement and a q-th percentile signal measurement of the signal measurements at the plurality of locations, whether the second wireless communication device satisfies an interference condition.
In an additional aspect of the disclosure, a method of wireless communication performed by a wireless communication device, the method includes selecting a channel access configuration for transmitting a communication signal in an unlicensed frequency band using a transmission beam, where the selecting is based at least in part on an p-th percentile signal measurement and a q-th percentile signal measurement of signal measurements associated with the transmission beam, where the signal measurements include one signal measurement at each of a plurality of locations; and transmitting, based on the channel access configuration and using the transmission beam, the communication signal in the unlicensed frequency band.
In an additional aspect of the disclosure, a first wireless communication device includes a memory; a transceiver; and at least one processor coupled to the memory and the transceiver, where the at least one processor is configured to receive, from a second wireless communication device via the transceiver, one or more signals associated with a beam parameter; determine, at each of a plurality of locations, a signal measurement for at least one received signal of the one or more received signals; and determine, based at least in part on an p-th percentile signal measurement and a q-th percentile signal measurement of the signal measurements at the plurality of locations, whether the second wireless communication device satisfies an interference condition.
In an additional aspect of the disclosure, a wireless communication device includes a memory; a transceiver; and at least one processor coupled to the memory and the transceiver, where the at least one processor is configured to select a channel access configuration for transmitting a communication signal in an unlicensed frequency band using a transmission beam, where the selecting is based at least in part on an p-th percentile signal measurement and a q-th percentile signal measurement of signal measurements associated with the transmission beam, where the signal measurements include one signal measurement at each of a plurality of locations; and transmit, via the transceiver based on the channel access configuration and using the transmission beam, the communication signal in the unlicensed frequency band.
In an additional aspect of the disclosure, a non-transitory computer-readable medium having program code recorded thereon, the program code includes code for causing a first wireless communication device to receive, from a second wireless communication device, one or more signals associated with a beam parameter; code for causing the first wireless communication device to determine, at each of a plurality of locations, a signal measurement for at least one received signal of the one or more received signals; and code for causing the first wireless communication device to determine, based at least in part on an p-th percentile signal measurement and a q-th percentile signal measurement of the signal measurements at the plurality of locations, whether the second wireless communication device satisfies an interference condition.
In an additional aspect of the disclosure, a non-transitory computer-readable medium having program code recorded thereon, the program code includes code for causing a wireless communication device to select a channel access configuration for transmitting a communication signal in an unlicensed frequency band using a transmission beam, where the selecting is based at least in part on an p-th percentile signal measurement and a q-th percentile signal measurement of signal measurements associated with the transmission beam, where the signal measurements include one signal measurement at each of a plurality of locations; and code for causing the wireless communication device to transmit, based on the channel access configuration and using the transmission beam, the communication signal in the unlicensed frequency band.
In an additional aspect of the disclosure, a first wireless communication device includes means for receiving, from a second wireless communication device, one or more signals associated with a beam parameter; means for determining, at each of a plurality of locations, a signal measurement for at least one received signal of the one or more received signals; and means for determining, based at least in part on an p-th percentile signal measurement and a q-th percentile signal measurement of the signal measurements at the plurality of locations, whether the second wireless communication device satisfies an interference condition.
In an additional aspect of the disclosure, a wireless communication device includes means for selecting a channel access configuration for transmitting a communication signal in an unlicensed frequency band using a transmission beam, where the selecting is based at least in part on an p-th percentile signal measurement and a q-th percentile signal measurement of signal measurements associated with the transmission beam, where the signal measurements include one signal measurement at each of a plurality of locations; and means for transmitting, based on the channel access configuration and using the transmission beam, the communication signal in the unlicensed frequency band.
In an additional aspect of the disclosure, a method of wireless communication performed by a first wireless communication device, the method includes receiving, from a second wireless communication device, one or more signals associated with a beam parameter; determining, at each of a plurality of locations, a signal measurement for at least one received signal of the one or more received signals; and determining, based on a k-th percentile signal measurement of the signal measurements at the plurality of locations, whether the second wireless communication device satisfies an interference condition.
In an additional aspect of the disclosure, a method of wireless communication performed by a wireless communication device, the method includes selecting a channel access configuration for transmitting a communication signal in an unlicensed frequency band using a transmission beam, where the selecting is based at least in part on a k-th percentile signal measurement of signal measurements associated with the transmission beam, where the signal measurements include one signal measurement at each of a plurality of locations; and transmitting, based on the channel access configuration and using the transmission beam, the communication signal in the unlicensed frequency band.
In an additional aspect of the disclosure, a first wireless communication device includes a transceiver configured to receive, from a second wireless communication device, one or more signals associated with a beam parameter; and a processor configured to determine, at each of a plurality of locations, a signal measurement for at least one received signal of the one or more received signals; and determine, based on a k-th percentile signal measurement of the signal measurements at the plurality of locations, whether the second wireless communication device satisfies an interference condition.
In an additional aspect of the disclosure, a wireless communication device includes a processor configured to select a channel access configuration for transmitting a communication signal in an unlicensed frequency band using a transmission beam, where the selecting is based at least in part on a k-th percentile signal measurement of signal measurements associated with the transmission beam, where the signal measurements include one signal measurement at each of a plurality of locations; and a transceiver configured to transmit, based on the channel access configuration and using the transmission beam, the communication signal in the unlicensed frequency band.
In an additional aspect of the disclosure, a non-transitory computer-readable medium having program code recorded thereon, the program code includes code for causing a first wireless communication device to receive, from a second wireless communication device, one or more signals associated with a beam parameter; code for causing the first wireless communication device to determine, at each of a plurality of locations, a signal measurement for at least one received signal of the one or more received signals; and code for causing the first wireless communication device to determine, based on a k-th percentile signal measurement of the signal measurements at the plurality of locations, whether the second wireless communication device satisfies an interference condition.
In an additional aspect of the disclosure, a non-transitory computer-readable medium having program code recorded thereon, the program code includes code for causing a wireless communication device to select a channel access configuration for transmitting a communication signal in an unlicensed frequency band using a transmission beam, where the selecting is based at least in part on a k-th percentile signal measurement of signal measurements associated with the transmission beam, where the signal measurements include one signal measurement at each of a plurality of locations; and code for causing the wireless communication device to transmit, based on the channel access configuration and using the transmission beam, the communication signal in the unlicensed frequency band.
In an additional aspect of the disclosure, a first wireless communication device includes means for receiving, from a second wireless communication device, one or more signals associated with a beam parameter; means for determining, at each of a plurality of locations, a signal measurement for at least one received signal of the one or more received signals; and means for determining, based on a k-th percentile signal measurement of the signal measurements at the plurality of locations, whether the second wireless communication device satisfies an interference condition.
In an additional aspect of the disclosure, a wireless communication includes means for selecting a channel access configuration for transmitting a communication signal in an unlicensed frequency band using a transmission beam, where the selecting is based at least in part on a k-th percentile signal measurement of signal measurements associated with the transmission beam, where the signal measurements include one signal measurement at each of a plurality of locations; and means for transmitting, based on the channel access configuration and using the transmission beam, the communication signal in the unlicensed frequency band.
Other aspects, features, and embodiments will become apparent to those of ordinary skill in the art, upon reviewing the following description of specific, exemplary aspects in conjunction with the accompanying figures. While features may be discussed relative to certain aspects and figures below, all aspects can include one or more of the advantageous features discussed herein. In other words, while one or more aspects may be discussed as having certain advantageous features, one or more of such features may also be used in accordance with the various aspects discussed herein. In similar fashion, while exemplary aspects may be discussed below as device, system, or method aspects it should be understood that such exemplary aspects can be implemented in various devices, systems, and methods.
The detailed description set forth below, in connection with the appended drawings, is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of the various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In some aspects, well-known structures and components are shown in block diagram form in order to avoid obscuring such concepts.
This disclosure relates generally to wireless communications systems, also referred to as wireless communications networks. In various aspects, the techniques and apparatus may be used for wireless communication networks such as code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, single-carrier FDMA (SC-FDMA) networks, LTE networks, Global System for Mobile Communications (GSM) networks, 5th Generation (5G) or new radio (NR) networks, as well as other communications networks. As described herein, the terms “networks” and “systems” may be used interchangeably.
An OFDMA network may implement a radio technology such as evolved UTRA (E-UTRA), Institute of Electrical and Electronics Engineers (IEEE) 802.11, IEEE 802.16, IEEE 802.20, flash-OFDM and the like. UTRA, E-UTRA, and GSM are part of universal mobile telecommunication system (UMTS). In particular, long term evolution (LTE) is a release of UMTS that uses E-UTRA. UTRA, E-UTRA, GSM, UMTS and LTE are described in documents provided from an organization named “3rd Generation Partnership Project” (3GPP), and cdma2000 is described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2). These various radio technologies and standards are known or are being developed. For example, the 3rd Generation Partnership Project (3GPP) is a collaboration between groups of telecommunications associations that aims to define a globally applicable third generation (3G) mobile phone specification. 3GPP long term evolution (LTE) is a 3GPP project which was aimed at improving the UMTS mobile phone standard. The 3GPP may define specifications for the next generation of mobile networks, mobile systems, and mobile devices. The present disclosure is concerned with the evolution of wireless technologies from LTE, 4G, 5G, NR, and beyond with shared access to wireless spectrum between networks using a collection of new and different radio access technologies or radio air interfaces.
In particular, 5G networks contemplate diverse deployments, diverse spectrum, and diverse services and devices that may be implemented using an OFDM-based unified, air interface. In order to achieve these goals, further enhancements to LTE and LTE-A are considered in addition to development of the new radio technology for 5G NR networks. The 5G NR will be capable of scaling to provide coverage (1) to a massive Internet of things (IoTs) with a ULtra-high density (e.g., ˜1M nodes/km2), ultra-low complexity (e.g., ˜10s of bits/sec), ultra-low energy (e.g., ˜10+ years of battery life), and deep coverage with the capability to reach challenging locations; (2) including mission-critical control with strong security to safeguard sensitive personal, financial, or classified information, ultra-high reliability (e.g., ˜99.9999% reliability), ultra-low latency (e.g., ˜ 1 ms), and users with wide ranges of mobility or lack thereof; and (3) with enhanced mobile broadband including extreme high capacity (e.g., ˜ 10 Tbps/km2), extreme data rates (e.g., multi-Gbps rate, 100+ Mbps user experienced rates), and deep awareness with advanced discovery and optimizations.
The 5G NR may be implemented to use optimized OFDM-based waveforms with scalable numerology and transmission time interval (TTI); having a common, flexible framework to efficiently multiplex services and features with a dynamic, low-latency time division duplex (TDD)/frequency division duplex (FDD) design; and with advanced wireless technologies, such as massive multiple input, multiple output (MIMO), robust millimeter wave (mmWave) transmissions, advanced channel coding, and device-centric mobility. Scalability of the numerology in 5G NR, with scaling of subcarrier spacing, may efficiently address operating diverse services across diverse spectrum and diverse deployments. For example, in various outdoor and macro coverage deployments of less than 3 GHZ FDD/TDD implementations, subcarrier spacing may occur with 15 kHz, for example over 5, 10, 20 MHZ, and the like bandwidth (BW). For other various outdoor and small cell coverage deployments of TDD greater than 3 GHZ, subcarrier spacing may occur with 30 kHz over 80/100 MHz BW. For other various indoor wideband implementations, using a TDD over the unlicensed portion of the 5 GHz band, the subcarrier spacing may occur with 60 kHz over a 160 MHz BW. Finally, for various deployments transmitting with mmWave components at a TDD of 28 GHz, subcarrier spacing may occur with 120 kHz over a 500 MHz BW. In certain aspects, frequency bands for 5G NR are separated into multiple different frequency ranges, a frequency range one (FR1), a frequency range two (FR2), and FR2x. FR1 bands include frequency bands at 7 GHz or lower (e.g., between about 410 MHz to about 7125 MHZ). FR2 bands include frequency bands in mmWave ranges between about 24.25 GHZ and about 52.6 GHz. FR2x bands include frequency bands in mmWave ranges between about 52.6 GHZ to about 71 GHz. The mmWave bands may have a shorter range, but a higher bandwidth than the FR1 bands. Additionally, 5G NR may support different sets of subcarrier spacing for different frequency ranges.
The scalable numerology of the 5G NR facilitates scalable TTI for diverse latency and quality of service (QOS) requirements. For example, shorter TTI may be used for low latency and high reliability, while longer TTI may be used for higher spectral efficiency. The efficient multiplexing of long and short TTIs to allow transmissions to start on symbol boundaries. 5G NR also contemplates a self-contained integrated subframe design with UL/downlink scheduling information, data, and acknowledgement in the same subframe. The self-contained integrated subframe supports communications in unlicensed or contention-based shared spectrum, adaptive UL/downlink that may be flexibly configured on a per-cell basis to dynamically switch between UL and downlink to meet the current traffic needs.
Various other aspects and features of the disclosure are further described below. It should be apparent that the teachings herein may be embodied in a wide variety of forms and that any specific structure, function, or both being disclosed herein is merely representative and not limiting. Based on the teachings herein one of an ordinary level of skill in the art should appreciate that an aspect disclosed herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, such an apparatus may be implemented or such a method may be practiced using other structure, functionality, or structure and functionality in addition to or other than one or more of the aspects set forth herein. For example, a method may be implemented as part of a system, device, apparatus, and/or as instructions stored on a computer readable medium for execution on a processor or computer. Furthermore, an aspect may comprise at least one element of a claim.
To enable coexistence among multiple devices in a shared or unlicensed spectrum, a listen-before-talk (LBT) procedure may be used to assess whether a shared channel is clear before transmitting a signal in the channel. During the LBT procedure, a device may perform a clear channel assessment (CCA) for a predetermined duration to contend for a channel occupancy time (COT). During the CCA, the device may compare the energy level detected in the channel to a threshold value. If the energy level exceeds the threshold, the device may determine that the channel is occupied, refrain from transmitting a signal in the channel, and repeat the CCA after a period of time, or the device may reduce its transmit power to avoid interfering with other devices that may be using the channel. If the energy level is below the threshold, the device may determine that the channel is unoccupied (indicating the device won the contention) and proceed with transmitting a signal in the COT.
The unlicensed spectrum that are available for wireless communications may include 5 gigahertz (GHz) bands, 6 GHZ bands, and 60 GHz bands. One of the key driver for LBT in the 60 GHz bands is European Telecommunications Standards Institute (ETSI). To that end, in a first ETSI operating mode, a mobile or fixed wireless communication device or node is mandated to perform an LBT prior to accessing an unlicensed band in the 60 GHz range. However, performing an LBT prior to each and every transmission can be an inefficient use of resources as a result of the overhead and delays associated with the LBT. Further, a device or node communicating over a 60 GHz band is likely to use beamformed signals to compensate the high signal attenuation at the high frequency. A beamformed signal may focus its signal energy in a specific beam direction towards an intended receiver, and thus multiple transmitters can transmit at the same time in different spatial directions without interfering with each other or with a minimal interference. Accordingly, in a second ETSI operating mode (which is under studies for standardization), a mobile or fixed wireless communication device or node may transmit without performing an LBT if the device or node uses a certain antenna gain for the transmission. Antenna gain may be correlated to a transmission beam width. For example, a high antenna gain may produce a narrower beam than a lower antenna gain. That is, the second ETSI operating mode allows a device to skip LBT when a transmission is transmitted using a narrow transmission beam. While utilizing a high antenna gain to generate a narrow beam for transmission and/or reception can reduce the likelihood of collisions, beam collisions can occur and there is no detection or mitigation when LBT is simply skipped.
In some examples, a transmitting node may perform long-term sensing in addition to LBT to mitigate beam collision. For long-term sensing, a transmitting node may monitor for interferences in a shared channel over a long period of time, for example, across multiple transmission periods or COTs (e.g., at periodic measurement occasions) instead of performing sensing only when there is data ready for transmission. In further examples, a transmitting node may combine LBT and/or long-term sensing with other coexistence techniques, such as setting a limit to the beam-width of a transmission beam, setting a limit for a transmit power, setting a limit for a duty cycle (e.g., a transmission to be within D % of total time), or setting a limit for beam dwell time (e.g., a maximum transmission duration along a certain beam direction) to further mitigate beam collision and/or interference.
As used herein, the term “transmission beam” may refer to a transmitter transmitting a beamformed signal in a certain spatial direction or beam direction and/or with a certain beam width covering a certain spatial angular sector. The transmission beam may have characteristics such as the beam direction and the beam width. The term “reception beam” may refer to a receiver using beamforming to receive a signal from a certain spatial direction or beam direction and/or within a certain beam width covering a certain spatial angular sector. The reception beam may have characteristics such as the beam direction and the beam width.
In certain aspects, a transmitting node may utilize one set of channel access procedures (e.g., without an LBT and/or long-term sensing) for channel access when the transmitting node utilizes a transmission beam that satisfies a narrow beam condition, and may utilize another set of channel access procedures for channel access when the transmitting node utilizes a transmission beam that fails to satisfy a narrow beam condition. That is, narrow-beam based channel access operates on the assumption that a narrow transmission beam may cause limited interference to surrounding nodes. Accordingly, it may be desirable to define a metric that test for the narrowness of a transmission beam. The narrowness of a beam as discussed herein is in the context of interference. Accordingly, the narrowness of a beam may not be limited to the geometrical perspective (e.g. beam width) of the beam, but may refer to the interference footprint of the beam on a network level. For instance, a fat or wide transmission beam (with a wide beamwidth) with a low gain and/or a low transmit power can be considered as narrow in terms of its interference to surrounding nodes.
The present disclosure provides techniques for determining whether a wireless communication device (e.g., a UE, a BS) satisfies an interference condition (e.g., a narrow beam condition) using a statistical approach, for example, based on multiple percentiles of signal measurements associated with a transmission beam at a plurality of locations. According to one aspect of the present disclosure, a first wireless communication device may be a testing device, and a second wireless communication device may be a device under test (e.g., a BS, a UE), for example, during a manufacturing test or a conformance test. During testing, the second wireless communication device may transmit, and the first wireless communication device may receive one or more signals associated with a beam parameter. The beam parameter may be associated with a transmission beam used by the second wireless communication device to transmit the one or more signals. The beam parameter may be associated with a beam characteristic (e.g., a beam direction) of the transmission beam. The beam parameter may identify the transmission beam from a set of transmission beams that can be generated by the second wireless communication device. The one or more signals may be any suitable signals (e.g., channel state information-reference signal (CSI-RS) and/or synchronization signal block (SSB)) that can facilitate beam measurements. The first wireless communication device may measure the received signal power (e.g., effective isotropic radiated power (EIRP)) of the one or more received signals at a plurality of locations. For instance, the first wireless communication device may determine, at each location of the plurality of locations (e.g., measurement locations), a signal measurement for at least one of the one or more received signals. Each of the plurality of locations may be at a respective azimuth angle and a respective elevation angle with respect to the second wireless communication device. In some aspects, the plurality of locations may be distributed over a surface of a spherical space enclosing the second wireless communication device. In general, the plurality of locations can be arranged in any suitable manner or over any suitable angular spatial sector of the second wireless communication device. In some aspects, the range and/or granularity of the elevation angles and azimuth angles associated with the plurality of locations may be dependent on operating parameters (e.g., frequency of operation, mobility conditions, type of wireless devices, device power class, class of services, interference tolerance levels, regulations, etc.) and conditions (e.g., density of wireless devices in the area of the second wireless communication device).
To determine whether the second wireless communication device satisfies the interference condition, the first wireless communication device may compute a cumulative distribution function (CDF) of the signal measurements measured at the plurality of locations. The first wireless communication device may subtract an offset value from the signal measurements before computing the CDF. The offset value may be associated with an antenna array gain of the second wireless communication device. In some instances, the offset value may be a maximum transmit power that can be used by the second wireless communication device for transmission. In other instances, the offset value may be a maximum signal measurement from among the signal measurements. The first wireless communication device may determine a first metric for the interference condition by determining a difference between a p-th percentile signal measurement and a q-th percentile signal measurement from the CDF. The first metric is a differential statistical metric. A first criterion for the interference condition may be based on a comparison of the first metric to a first predetermined threshold. For instance, for the first criterion, if the difference between the p-th percentile signal measurement and the q-th percentile signal measurement is greater than the first threshold, the second wireless communication device satisfies the interference condition. If, however, the difference between the p-th percentile signal measurement and the q-th percentile signal measurement is less than or equal to the first threshold, the second wireless communication device fails to satisfy the interference condition. In some aspects, the first wireless communication device may determine the value p for the p-th percentile signal measurement, the value q for the q-th percentile signal measurement, and/or the first threshold based on operating parameters (e.g., frequency of operation, mobility conditions, type of wireless devices, device power class, class of services, interference tolerance levels, regulations, etc.) and conditions (e.g., density of wireless devices in the area of the second wireless communication device).
Additionally or alternatively, the first wireless communication device may determine a second metric for the interference condition, where the second metric may be a k-th percentile signal measurement from the CDF, where k may be less than p and less than q. A second criterion of the interference condition may be based on a comparison of the second metric to a second predetermined threshold. For instance, for the second criterion, if the k-th percentile signal measurement is less than the second threshold, the second wireless communication device satisfies the interference condition. If, however, the k-th percentile signal measurement is greater than or equal to the second threshold, the second wireless communication device fails to satisfy the interference condition. In some aspects, the first wireless communication device may determine the value k for the k-th percentile signal and/or the second threshold based on operating parameters (e.g., frequency of operation, mobility conditions, type of wireless devices, device power class, class of services, interference tolerance levels, regulations, etc.) and conditions (e.g., density of wireless devices in the area of the second wireless communication device).
In some aspects, the first wireless communication device may determine to test the second wireless communication device for the interference condition (using the statistical approach) when the second wireless communication device is to utilize a transmit power that exceeds a certain threshold for transmission. In some aspects, the first wireless communication device may determine the threshold transmit power based on operating parameters (e.g., frequency of operation, mobility conditions, type of wireless devices, device power class, class of services, interference tolerance level, regulations, etc.) and conditions (e.g., density of wireless devices in the area of the second wireless communication device).
In some aspects, the interference condition may be associated with a narrow beam condition. Accordingly, if the second wireless communication device satisfies the interference condition, the second wireless communication device may satisfy the narrow beam condition.
According to another aspect of the disclosure, a wireless communication device (e.g., a BS, a UE) may select a channel access configuration for transmitting a communication signal in an unlicensed frequency band using a transmission beam. The selecting may be based at least in part on a p-th percentile signal measurement and a q-th percentile signal measurement of signal measurements associated with the transmission beam, where the signal measurements include one signal measurement at each of a plurality of locations. For instance, the wireless communication device may be configured with one or more tables of CDFs of signal measurements associated with the transmission beam, for example, stored at a memory of the wireless communication device. The wireless communication device may perform a table lookup to obtain the p-th percentile signal measurement and the q-th percentile signal measurement and compare a difference between the p-th percentile signal measurement and the q-th percentile signal measurement to a first predetermined threshold. For instance, if the difference between the p-th percentile signal measurement and the q-th percentile signal measurement is greater than the first threshold, the second wireless communication device satisfies the interference condition. If, however, the difference between the p-th percentile signal measurement and the q-th percentile signal measurement is less than or equal to the threshold, the second wireless communication device fails to satisfy the interference condition.
Additionally or alternatively, the wireless communication device may determine whether a k-th percentile signal measurement of the signal measurements satisfies a second predetermined threshold. For instance, if the k-th percentile signal measurement is less than the second threshold, the second wireless communication device satisfies the interference condition. If, however, the k-th percentile signal measurement is greater than or equal to the second threshold, the second wireless communication device fails to satisfy the interference condition.
The wireless communication device may transmit, based on the channel access configuration and using the transmission beam, the communication signal in the unlicensed frequency band. For instance, if the interference condition is satisfied, the wireless communication device may transmit the communication signal using the transmission beam without performing channel sensing (e.g., an LBT or long-term sensing).
In some aspects, if a transmit power to be used for transmitting the communication signal with the transmission beam is below a threshold, the wireless communication device may not test for the interference condition. For instance, the wireless communication device may transmit the communication signal using the transmission beam without performing channel sensing (e.g., an LBT or long-term sensing).
In some aspects, the wireless communication device may determine whether the wireless communication device satisfies the interference condition based on operating parameter(s) and/or condition(s) of the second wireless communication device. For example, the value p for p-th percentile, the value q for the q-th percentile, the value k for the k-th percentile, the first threshold (e.g., the comparison threshold for the difference between the p-th percentile signal measurement and the q-th percentile signal measurement), and/or the second threshold (e.g., the comparison threshold for the k-th percentile signal measurement) may be based on operating parameters (e.g., frequency of operation, mobility conditions, type of wireless devices, device power class, class of services, interference tolerance level, regulations, etc.) and conditions (e.g., density of wireless devices in the area of the second wireless communication device).
In some aspects, the interference condition can be based on a singular statistical metric. For instance, the determination of whether a transmission beam of a wireless communication device satisfies the interference condition may be based on a comparison of a k-th percentile signal measurement of signal measurements of the transmission beam to a predetermined threshold (e.g., similar to the second criterion discussed above). The signal measurements can be measured at a plurality of locations as discussed above. In some aspects, the k-th percentile signal measurement can be obtained from a CDF of signal measurements of the transmission beam measured at the plurality of locations. In other aspects, an offset value (e.g., associated with an antenna array gain of the wireless communication device) can be subtracted from the signal measurements, and the k-th percentile signal measurement can be obtained from a CDF of the signal measurements with the offset applied. In some aspects, the singular statistical-based mechanisms for determining whether a transmission beam of a wireless communication device satisfies the interference condition may be applied to offline testing (e.g., in a conformance test or a manufacturing test). In some aspects, the singular statistical-based mechanisms for determining whether a transmission beam of a wireless communication device satisfies the interference condition may be applied for selecting a channel access procedure during real-time operations.
Aspects of the present disclosure can provide several benefits. For example, if a wireless device satisfies the inference condition, the probability that the wireless device will interfere with other wireless devices in the area may be reduced. The interference may be low enough (under a threshold) such that the wireless device may implement channel access methods that reduces latency and overhead. For example, if the wireless device satisfies the interference condition, the wireless device may not perform an LBT and/or a long-term sensing before accessing the channel.
A BS 105 may provide communication coverage for a macro cell or a small cell, such as a pico cell or a femto cell, and/or other types of cell. A macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions with the network provider. A small cell, such as a pico cell, would generally cover a relatively smaller geographic area and may allow unrestricted access by UEs with service subscriptions with the network provider. A small cell, such as a femto cell, would also generally cover a relatively small geographic area (e.g., a home) and, in addition to unrestricted access, may also provide restricted access by UEs having an association with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs for users in the home, and the like). A BS for a macro cell may be referred to as a macro BS. A BS for a small cell may be referred to as a small cell BS, a pico BS, a femto BS or a home BS. In the example shown in
The network 100 may support synchronous or asynchronous operation. For synchronous operation, the BSs may have similar frame timing, and transmissions from different BSs may be approximately aligned in time. For asynchronous operation, the BSs may have different frame timing, and transmissions from different BSs may not be aligned in time.
The UEs 115 are dispersed throughout the wireless network 100, and each UE 115 may be stationary or mobile. A UE 115 may also be referred to as a terminal, a mobile station, a subscriber unit, a station, or the like. A UE 115 may be a cellular phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a tablet computer, a laptop computer, a cordless phone, a wireless local loop (WLL) station, or the like. In one aspect, a UE 115 may be a device that includes a Universal Integrated Circuit Card (UICC). In another aspect, a UE may be a device that does not include a UICC. In some aspects, the UEs 115 that do not include UICCs may also be referred to as IoT devices or internet of everything (IoE) devices. The UEs 115a-115d are examples of mobile smart phone-type devices accessing network 100. A UE 115 may also be a machine specifically configured for connected communication, including machine type communication (MTC), enhanced MTC (eMTC), narrowband IoT (NB-IOT) and the like. The UEs 115c-115h are examples of various machines configured for communication that access the network 100. The UEs 115i-115k are examples of vehicles equipped with wireless communication devices configured for communication that access the network 100. A UE 115 may be able to communicate with any type of the BSs, whether macro BS, small cell, or the like. In
In operation, the BSs 105a-105c may serve the UEs 115a and 115b using 3D beamforming and coordinated spatial techniques, such as coordinated multipoint (CoMP) or multi-connectivity. The macro BS 105d may perform backhaul communications with the BSs 105a-105c, as well as small cell, the BS 105f. The macro BS 105d may also transmits multicast services which are subscribed to and received by the UEs 115c and 115d. Such multicast services may include mobile television or stream video, or may include other services for providing community information, such as weather emergencies or alerts, such as Amber alerts or gray alerts.
The BSs 105 may also communicate with a core network. The core network may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. At least some of the BSs 105 (e.g., which may be an example of a gNB or an access node controller (ANC)) may interface with the core network through backhaul links (e.g., NG-C, NG-U, etc.) and may perform radio configuration and scheduling for communication with the UEs 115. In various examples, the BSs 105 may communicate, cither directly or indirectly (e.g., through core network), with each other over backhaul links (e.g., X1, X2, etc.), which may be wired or wireless communication links.
The network 100 may also support time-stringent communications with ultra-reliable and redundant links for time-stringent devices, such as the UE 115c. Redundant communication links with the UE 115c may include links from the macro BSs 105d and 105c, as well as links from the small cell BS 105f. Other machine type devices, such as the UE 115f (e.g., a thermometer), the UE 115g (e.g., smart meter), and UE 115h (e.g., wearable device) may communicate through the network 100 either directly with BSs, such as the small cell BS 105f, and the macro BS 105c, or in multi-action-size configurations by communicating with another user device which relays its information to the network, such as the UE 115f communicating temperature measurement information to the smart meter, the UE 115g, which is then reported to the network through the small cell BS 105f. The network 100 may also provide additional network efficiency through dynamic, low-latency TDD/FDD communications, such as V2V, V2X, C-V2X communications between a UE 115i, 115j, or 115k and other UEs 115, and/or vehicle-to-infrastructure (V2I) communications between a UE 115i, 115j, or 115k and a BS 105.
In some implementations, the network 100 utilizes OFDM-based waveforms for communications. An OFDM-based system may partition the system BW into multiple (K) orthogonal subcarriers, which are also commonly referred to as subcarriers, tones, bins, or the like. Each subcarrier may be modulated with data. In some aspects, the subcarrier spacing between adjacent subcarriers may be fixed, and the total number of subcarriers (K) may be dependent on the system BW. The system BW may also be partitioned into subbands. In other aspects, the subcarrier spacing and/or the duration of TTIs may be scalable.
In some aspects, the BSs 105 can assign or schedule transmission resources (e.g., in the form of time-frequency resource blocks (RB)) for downlink (DL) and uplink (UL) transmissions in the network 100. DL refers to the transmission direction from a BS 105 to a UE 115, whereas UL refers to the transmission direction from a UE 115 to a BS 105. The communication can be in the form of radio frames. A radio frame may be divided into a plurality of subframes or slots, for example, about 10. Each slot may be further divided into mini-slots. In a FDD mode, simultaneous UL and DL transmissions may occur in different frequency bands. For example, each subframe includes a UL subframe in a UL frequency band and a DL subframe in a DL frequency band. In a TDD mode, UL and DL transmissions occur at different time periods using the same frequency band. For example, a subset of the subframes (e.g., DL subframes) in a radio frame may be used for DL transmissions and another subset of the subframes (e.g., UL subframes) in the radio frame may be used for UL transmissions.
The DL subframes and the UL subframes can be further divided into several regions. For example, each DL or UL subframe may have pre-defined regions for transmissions of reference signals, control information, and data. Reference signals are predetermined signals that facilitate the communications between the BSs 105 and the UEs 115. For example, a reference signal can have a particular pilot pattern or structure, where pilot tones may span across an operational BW or frequency band, each positioned at a pre-defined time and a pre-defined frequency. For example, a BS 105 may transmit cell specific reference signals (CRSs) and/or channel state information-reference signals (CSI-RSs) to enable a UE 115 to estimate a DL channel. Similarly, a UE 115 may transmit sounding reference signals (SRSs) to enable a BS 105 to estimate a UL channel. Control information may include resource assignments and protocol controls. Data may include protocol data and/or operational data. In some aspects, the BSs 105 and the UEs 115 may communicate using self-contained subframes. A self-contained subframe may include a portion for DL communication and a portion for UL communication. A self-contained subframe can be DL-centric or UL-centric. A DL-centric subframe may include a longer duration for DL communication than for UL communication. A UL-centric subframe may include a longer duration for UL communication than for DL communication.
In some aspects, the network 100 may be an NR network deployed over a licensed spectrum. The BSs 105 can transmit synchronization signals (e.g., including a primary synchronization signal (PSS) and a secondary synchronization signal (SSS)) in the network 100 to facilitate synchronization. The BSs 105 can broadcast system information associated with the network 100 (e.g., including a master information block (MIB), remaining system information (RMSI), and other system information (OSI)) to facilitate initial network access. In some aspects, the BSs 105 may broadcast the PSS, the SSS, and/or the MIB in the form of synchronization signal block (SSBs) and may broadcast the RMSI and/or the OSI over a physical downlink shared channel (PDSCH). The MIB may be transmitted over a physical broadcast channel (PBCH).
In some aspects, a UE 115 attempting to access the network 100 may perform an initial cell search by detecting a PSS from a BS 105. The PSS may enable synchronization of period timing and may indicate a physical layer identity value. The UE 115 may then receive a SSS. The SSS may enable radio frame synchronization, and may provide a cell identity value, which may be combined with the physical layer identity value to identify the cell. The PSS and the SSS may be located in a central portion of a carrier or any suitable frequencies within the carrier.
After receiving the PSS and SSS, the UE 115 may receive a MIB. The MIB may include system information for initial network access and scheduling information for RMSI and/or OSI. After decoding the MIB, the UE 115 may receive RMSI and/or OSI. The RMSI and/or OSI may include radio resource control (RRC) information related to random access channel (RACH) procedures, paging, control resource set (CORESET) for physical downlink control channel (PDCCH) monitoring, physical UL control channel (PUCCH), physical UL shared channel (PUSCH), power control, and SRS.
After obtaining the MIB, the RMSI and/or the OSI, the UE 115 can perform a random access procedure to establish a connection with the BS 105. In some examples, the random access procedure may be a four-step random access procedure. For example, the UE 115 may transmit a random access preamble and the BS 105 may respond with a random access response. The random access response (RAR) may include a detected random access preamble identifier (ID) corresponding to the random access preamble, timing advance (TA) information, a UL grant, a temporary cell-radio network temporary identifier (C-RNTI), and/or a backoff indicator. Upon receiving the random access response, the UE 115 may transmit a connection request to the BS 105 and the BS 105 may respond with a connection response. The connection response may indicate a contention resolution. In some examples, the random access preamble, the RAR, the connection request, and the connection response can be referred to as message 1 (MSG1), message 2 (MSG2), message 3 (MSG3), and message 4 (MSG4), respectively. In some examples, the random access procedure may be a two-step random access procedure, where the UE 115 may transmit a random access preamble and a connection request in a single transmission and the BS 105 may respond by transmitting a random access response and a connection response in a single transmission.
After establishing a connection, the UE 115 and the BS 105 can enter a normal operation stage, where operational data may be exchanged. For example, the BS 105 may schedule the UE 115 for UL and/or DL communications. The BS 105 may transmit UL and/or DL scheduling grants to the UE 115 via a PDCCH. The scheduling grants may be transmitted in the form of DL control information (DCI). The BS 105 may transmit a DL communication signal (e.g., carrying data) to the UE 115 via a PDSCH according to a DL scheduling grant. The UE 115 may transmit a UL communication signal to the BS 105 via a PUSCH and/or PUCCH according to a UL scheduling grant. The connection may be referred to as an RRC connection. When the UE 115 is actively exchanging data with the BS 105, the UE 115 is in an RRC connected state.
In an example, after establishing a connection with the BS 105, the UE 115 may initiate an initial network attachment procedure with the network 100. The BS 105 may coordinate with various network entities or fifth generation core (5GC) entities, such as an access and mobility function (AMF), a serving gateway (SGW), and/or a packet data network gateway (PGW), to complete the network attachment procedure. For example, the BS 105 may coordinate with the network entities in the 5GC to identify the UE, authenticate the UE, and/or authorize the UE for sending and/or receiving data in the network 100. In addition, the AMF may assign the UE with a group of tracking areas (TAs). Once the network attach procedure succeeds, a context is established for the UE 115 in the AMF. After a successful attach to the network, the UE 115 can move around the current TA. For tracking area update (TAU), the BS 105 may request the UE 115 to update the network 100 with the UE 115's location periodically. Alternatively, the UE 115 may only report the UE 115's location to the network 100 when entering a new TA. The TAU allows the network 100 to quickly locate the UE 115 and page the UE 115 upon receiving an incoming data packet or call for the UE 115.
In some aspects, the BS 105 may communicate with a UE 115 using HARQ techniques to improve communication reliability, for example, to provide a URLLC service. The BS 105 may schedule a UE 115 for a PDSCH communication by transmitting a DL grant in a PDCCH. The BS 105 may transmit a DL data packet to the UE 115 according to the schedule in the PDSCH. The DL data packet may be transmitted in the form of a transport block (TB). If the UE 115 receives the DL data packet successfully, the UE 115 may transmit a HARQ ACK to the BS 105. Conversely, if the UE 115 fails to receive the DL transmission successfully, the UE 115 may transmit a HARQ NACK to the BS 105. Upon receiving a HARQ NACK from the UE 115, the BS 105 may retransmit the DL data packet to the UE 115. The retransmission may include the same coded version of DL data as the initial transmission. Alternatively, the retransmission may include a different coded version of the DL data than the initial transmission. The UE 115 may apply soft combining to combine the encoded data received from the initial transmission and the retransmission for decoding. The BS 105 and the UE 115 may also apply HARQ for UL communications using substantially similar mechanisms as the DL HARQ.
In some aspects, the network 100 may operate over a system BW or a component carrier (CC) BW. The network 100 may partition the system BW into multiple BWPs (e.g., portions). A BS 105 may dynamically assign a UE 115 to operate over a certain BWP (e.g., a certain portion of the system BW). The assigned BWP may be referred to as the active BWP. The UE 115 may monitor the active BWP for signaling information from the BS 105. The BS 105 may schedule the UE 115 for UL or DL communications in the active BWP. In some aspects, a BS 105 may assign a pair of BWPs within the CC to a UE 115 for UL and DL communications. For example, the BWP pair may include one BWP for UL communications and one BWP for DL communications.
In some aspects, the network 100 may operate over a shared channel, which may include shared frequency bands and/or unlicensed frequency bands. For example, the network 100 may be an NR-U network operating over an unlicensed frequency band. In such an aspect, the BSs 105 and the UEs 115 may be operated by multiple network operating entities. To avoid collisions, the BSs 105 and the UEs 115 may employ a listen-before-talk (LBT) procedure to monitor for transmission opportunities (TXOPs) in the shared channel. A TXOP may also be referred to as COT. The goal of LBT is to protect reception at a receiver from interference. For example, a transmitting node (e.g., a BS 105 or a UE 115) may perform an LBT prior to transmitting in the channel. When the LBT passes, the transmitting node may proceed with the transmission. When the LBT fails, the transmitting node may refrain from transmitting in the channel.
An LBT can be based on energy detection (ED) or signal detection. For an energy detection-based LBT, the LBT results in a pass when signal energy measured from the channel is below a threshold. Conversely, the LBT results in a failure when signal energy measured from the channel exceeds the threshold. For a signal detection-based LBT, the LBT results in a pass when a channel reservation signal (e.g., a predetermined preamble signal) is not detected in the channel. Additionally, an LBT may be in a variety of modes. An LBT mode may be, for example, a category 4 (CAT4) LBT, a category 2 (CAT2) LBT, or a category 1 (CAT1) LBT. A CAT1 LBT is referred to a no LBT mode, where no LBT is to be performed prior to a transmission. A CAT2 LBT refers to an LBT without a random backoff period. For instance, a transmitting node may determine a channel measurement in a time interval and determine whether the channel is available or not based on a comparison of the channel measurement against a ED threshold. A CAT4 LBT refers to an LBT with a random backoff and a variable contention window (CW). For instance, a transmitting node may draw a random number and backoff for a duration based on the drawn random number in a certain time unit.
In some aspects, the network 100 may operate over a mmWave band (e.g., at 60 GHZ). Due to the high pathloss in the mmWave band, the BSs 105 and the UEs 115 may utilize directional beams to communicate with each other. For instance, a BS 105 and/or a UE 115 may be equipped with one or more antenna panels or antenna arrays with antenna elements that can be configured to focus transmit signal energy and/or receive signal energy in a certain spatial direction and within a certain spatial angular sector or width. In general, a BS 105 and/or a UE 115 may be capable of generating a transmission beam for transmission or a reception beam for reception in various spatial direction or beam directions.
In the scenario 200, the BS 205 may serve the UE 215a. In some instances, the UE 215b may be served by the BS 205. In other instances, the UE 215b may be served by another BS (e.g., another BS 105 or 205). In such instances, the UE 215b and the other BS can be operated by the same network operating entity as the BS 205 or a different network operating entity than the BS 205 Further, in some instances, the UE 215b and the other BS may utilize the same RAT as the BS 205 and the UE 215a. In other instances, the UE 215b and the other BS may utilize a different RAT than the BS 205 and the UE 215a. For instance, the BS 205 and the UE 215a may be NR-U devices, and the other BS and the UE 215b may be WiFi devices. NR-U may refer to the deployment of NR over an unlicensed spectrum.
The BSs 205 and the UEs 215 may communicate over a mmWave band. The mmWave band may be at any mmWave frequencies (e.g., at 20 GHZ, 30 GHz, 60 GHz or higher). As explained above, the high mmWave frequencies can have a high pathloss, and a device operating over such frequencies may use beamforming for transmission and/or reception to compensate the high signal attenuation. For instance, the BS 205 may be capable of generating a number of directional transmission beams in a number of beam or spatial directions (e.g., about 2, 4, 8, 16, 32, 64 or more) and may select a certain transmission beam or beam direction to communicate with the UE 215a based on the location of the UE 215a in relation to the location of the BS 205 and/or any other environmental factors such as scatterers in the surrounding. For example, the BS 205s may select a transmission beam that provides a best quality (e.g., with the highest receive signal strength) for communication with the UE 215a. The UE 215a may also be capable of generating a number of directional transmission beams in a number of beam or spatial directions (e.g., about 2, 4, 8 or more) and may select a certain transmission beam that provides the best quality (e.g., with the highest receive signal strength) to communicate with the BS 205. In some instances, the BS 205 and the UE 215a may perform a beam selection procedure with each other to determine a best UL beam and a best DL beam for communications.
In the illustrated example of
As explained above, narrow beam transmissions can be used as a coexistence mechanism for spectrum sharing since the transmission beam may focus the transmission signal energy in a specific beam direction, and thus may be less likely to interfere with transmissions and/or receptions of neighboring devices.
At block 310, a wireless communication device (e.g., a BS 105, 205, 1200, a UE 115, 215, or a wireless communication device 1300) may determine whether a narrow beam condition is satisfied. For instance, the wireless communication device may determine whether a beam characteristic of a transmission beam to be used for an upcoming transmission satisfies (e.g., less than) a certain threshold. In some aspects, the wireless communication device may determine whether a beam width (e.g., a half-power beam width) of the beam satisfies a threshold. Additionally or alternatively, the wireless communication device may determine whether a transmit power of the beam satisfies a threshold. Additionally or alternatively, the wireless communication device may determine whether a beam dwell time or a duty cycle of the beam satisfies a threshold. For instance, the transmission beam may satisfy the narrow beam condition if the beam width is less than a certain threshold, if the transmit power is less than a certain threshold, and/or if the beam dwell time is less than a certain threshold. Conversely, the transmission beam may fail to satisfy the narrow beam condition if the beam width exceeds a certain threshold, if the transmit power exceeds a certain threshold, and/or if the beam dwell time exceeds a certain threshold.
At block 320, if the narrow beam condition is satisfied, the wireless communication device may utilize a first set of channel access procedures. In some aspects, the first set of channel access procedures may include a channel access without performing an LBT and/or long-term sensing. In some aspects, the first set of channel access procedures may also include various restrictions on the transmission power, the transmission duty cycle, and/or the beam dwell time that the wireless communication device may use.
If, however, the narrow beam condition is not satisfied, the wireless communication device may proceed to block 330. At block 330, the wireless communication device may utilize a second set of channel access procedures. In some aspects, the second set of channel access procedures may include a channel access after a successful LBT and/or a low interference detection from long-term sensing. In some aspects, the first set of channel access procedures may also include various restrictions on the transmission power, the transmission duty cycle, and/or the beam dwell time that the wireless communication device may use.
While utilizing the narrow beam condition as in the method 300 can reduce the likelihood of the beam collision, a transmission beam may include main lobes and side lobes. For instance, a directional antenna array or elements in which the objective is to emit a transmission beam (RF signal waves) in a specific direction. However, directional antenna array or elements may also generate unwanted or undesired radiation in directions other than the specific direction (the intended direction). That is, the transmission beam may have a main lobe in the specific direction and side lobe(s) in other directions. The main lobe is configured to have a larger field strength than the other side lobe(s). The side lobe(s) can cause interference in undesirable or unintended directions. Accordingly, a transmission beam even with a narrow beam width can cause interference in directions other than the specific direction that the transmission beam is directed to as will be discussed below in
The scenario 400 provides further illustration of interference in the communication scenario 200, where the BS 205 utilizes transmit beamforming to communicate with the UE 215a. As shown in
While
Depending on the strength or the transmit power of the transmission beam, the geometry of the main lobe and/or side lobes of the transmission beam, and/or the interference tolerance levels of the UEs (e.g., the UEs 215b, 215c, and/or 215d) located in the unintended receive zones (e.g., the zones 404 and 406), the transmission beam can interfere and degrade communications of those UEs in the unintended receive zones. Accordingly, the narrowness of a beam footprint in the context of interference may consider not only the specific direction from the main lobe, but rather in all spatial directions including the side lobes.
As discussed above, wireless devices such as the BSs 105 and 205 and UEs 115 and 215 may apply analog and/or digital beamforming to direct an RF transmission in a direction towards a target receiver. Directing an RF transmission beam towards a specific direction may require narrowing the width of the beam. In some instances, narrowing the beam width may reduce interference to wireless devices outside the beam.
In some instances, the measurement setup 500 may be configured as a sphere 520 as shown in
RF sensors 522(1) . . . 522(n) may be located on (e.g., distributed across) the surface of the sphere 520. RF sensors 522(1) . . . 522(n) may include an array of discrete receive antennas and RF processors arranged in a sphere 520. Each of the measurements may be recorded at a location on the sphere 520. For example, each of the locations may be defined by an azimuth angle with respect to axis N and an elevation angle with respect to axis Z (e.g. discrete elevation angles, each elevation angle defining the plane). The constant step size grid type has the azimuth and elevation angles uniformly distributed. For example, the RF sensors 522(1) . . . 522(n) may be distributed in a uniform planar manner (e.g., constant step size) such that for each of the configured planes (X-N planes) along the Z axis RF sensors 522(1) . . . 522(n) may be located within each configured plane (each configured plane having the same elevation angle) and having a different azimuth angle. The difference in the azimuth angle between RF sensors 522(1) . . . 522(n) may be the same (e.g., evenly spaced). In some instances, the RF sensors 522(1) . . . 522(n) may be part of a wireless device such as a BS 105. The RF sensors 522(1) . . . 522(n) may record measurements (e.g., EIRP) of signals associated with a transmission beam (e.g., transmission beam 524). The recorded measurements may be processed to determine whether the wireless device (e.g., UE 115) satisfies an interference condition based on the recorded signal measurements.
RF sensors 522(1) . . . 522(n) may be located on (e.g., distributed across) the surface of the sphere 520. The measurement setup 700 may be configured similar to the measurement setup 600 with the difference being the arrangement in the location of the RF sensors 522(1) . . . 522(n). In contrast to the arrangement in
At action 805, the DUT 802 transmits, and the testing device 804 receives, one or more signals associated with a beam parameter. The DUT 802 may transmit the one or more signals using a certain transmission beam. The beam parameter may be denoted as j, representing a certain beam characteristic such as a beam direction. That is, the DUT 802 transmits the one or more signals using a transmission beam j. For instance, the DUT 802 may transmit a first signal of the one or more signals using the transmission beam j, transmit a second signal of the one or more signals using the same transmission beam j, and so on. In some instances, the transmission beam j may be similar to the transmission beam 202 discussed above with reference to
In response to receiving the one or more signals from the DUT 802, the testing device 804 may determine, at each location of a plurality of locations, a signal measurement for at least one received signal of the one or more received signals. Each measurement location of the plurality of locations may be at a certain elevation angle, represented by θ, and at a certain azimuth angle, represented by ϕ, with respect to the DUT 802. In some aspects, the plurality of locations may be associated with a spherical coverage of the DUT 802. In this regard, the DUT 802 may be positioned at a certain location and the plurality of locations may be distributed across a surface of a spherical space (e.g., the sphere 520) enclosing the DUT 802, for example, similar to the measurement setup 500 discussed above with reference to
In general, the plurality of locations may be arranged in any suitable manner. For example, the plurality of locations may be spaced apart from each other by any suitable distances (e.g., uniformly or non-uniformly). That is, the elevation angles and/or the azimuth angles for the plurality of locations can have any suitable granularities or step size. Further, the plurality of locations may cover any suitable angular spatial sector of the DUT 802. That is, the plurality of locations may be defined with azimuth angles and/or elevation angles in any suitable range. For instance, in some aspects, the plurality of locations may be distributed within a certain spatial sector of interest to the operations of the DUT 802. As an example, when the DUT 802 is a BS such as the BS 105 or 205, and the BS is to be for deployment in an area covered by three cells, the plurality of locations for the signal measurements may be within −60 degrees to +60 degrees in the azimuth direction based on the field of view of a cell served by the BS. In some aspects, the range and/or granularity of measurements in terms of angular azimuth and elevation directions can be determined based on regulation on the frequency band of operations or any other suitable operating parameter associated with the DUT 802.
In some aspects, the testing device 804 may include RF sensors or transmission-reception points (TRPs) that are positioned at the plurality of locations. Accordingly, the testing device 804 may measure a signal received from the DUT 802 at each of the plurality of locations at the same time. In other aspects, the testing device 804 may be repositioned to a different location of the plurality of locations for each measurement. In such a test setup, the DUT 802 may transmit the same signal repeatedly using the same transmission beam so that the testing device 804 may determine a signal measurement at each location of the plurality of locations.
As shown, at action 810, the testing device 804 determines and records a signal measurement for at least one of the one or more received signals at a first location of the plurality of locations. The signal measurement may be a received signal power or an EIRP of at least one of the one or more received signals. As explained above, each of the plurality of locations may have a certain elevation angle θ and a certain azimuth angle ϕ with respect to the DUT 802. Thus, the signal measurement at the first location can be represented by Rϕ(1),θ(1) or simplified to R1.
At action 820, the testing device 804 determines and records a signal measurement for at least one of the one or more received signals at a second location of the plurality of locations. The signal measurement may be a received signal power or an EIRP of at least one of the one or more received signals. The signal measurement at the second location can be represented by Rϕ(2),θ(2) or simplified to R2.
The testing device 804 may continue to determine, at each of the plurality of locations, a signal measurement for at least one of the one or more received signals until one signal measurement is collected at each of the plurality of locations. As an example, a number of the plurality of locations is L. As such, at action 830, the testing device 804 determines and records a signal measurement for the one or more received signals at an L-th location of the plurality of locations. The signal measurement may be a received signal power or an EIRP of at least one of the one or more received signals. The signal measurement at the L-th location can be represented by Rϕ(L),θ(L) or simplified to Ry. At the end of action 830, the testing device 804 may have obtained and recorded L signal measurements (one signal measurement at each location of the plurality of locations). The set of L signal measurements at the plurality of locations for the transmission beam j can be represented by Ej={R1, R2, . . . . RL}.
At action 835, the DUT 802 determines whether there are more transmission beams in the beam set B to be measured (for testing). If there are more transmission beams in the beam set B, the DUT 802 may return to action 805 and transmits one or more signals using a next transmission beam (e.g., beam j+1) in the beam set B. If all the N transmission beams in the beam set B have been measured, the DUT 802 may terminate all test transmissions as shown by action 838.
At action 840, the testing device 804 determines whether there are more transmission beams in the beam set B to be tested or measured. If there are more transmission beams in the beam set B, the testing device 804 may repeat the actions 810-830 to determine, at each location of a plurality of locations, a signal measurement for at least one of the one or more received signals associated with the next transmission beam (e.g., beam j+1) of the DUT 802. If all the transmission beams in the beam set B have been measured, the testing device 804 proceeds to action 845.
At action 845, after recording signal measurements at each location of the plurality of locations for each transmission beam in the beam set B, the testing device 804 determines a CDF for the signal measurements for each beam j. The signal measurements for all transmission beams can be represented by Ē={E1, E2, . . . , EN}, where E1 may represent the set of signal measurements for a first transmission beam (in the beam set B) measured at the plurality of locations, E2 may represent the set of signal measurements for a second transmission beam (in the beam set B) measured at the plurality of locations, and so on.
The CDF of a random variable X can be represented by F(x), where F(x)=Pr(X≤x), which is the probability that X is less than or equal to x. In some aspects, for each transmission j, the testing device 804 may compute a CDF for Ej by calculating a probability distribution function (PDF) for the corresponding set of signal measurements, and then calculate cumulative probabilities from the PDF. In one aspect, the testing device 804 may compute a CDF for each beam j after subtracting an offset value, represented by c, from corresponding signal measurements. That is, the testing device 804 computes a CDF of {Ri−c:i∈Ej} for each beam j. The offset value c may be associated with an antenna array gain of the DUT 802. In some aspects, the offset value c may be associated with an antenna gain of the DUT 802. In some instances, the offset value c may be a maximum transmit power, represented by Pmax, that can be transmitted by at the DUT 802. In other instances, the offset value c may be the maximum signal measurement (e.g., a peak measured EIRP) among the corresponding signal measurements Ej. Examples of CDF of signal measurements are shown and discussed with reference to
At action 850, the testing device 804 determines whether an interference condition (e.g., a narrow beam condition) is satisfied for each transmission beam j. According to one aspect of the present disclosure, the metric for determining whether the interference condition is satisfied may be based on a k-th percentile signal measurement of the signal measurements for the transmission beam j at the plurality of locations, where the k-th percentile signal measurement may be represented by:
M_j=kth percentile({Ri:i∈Ej}). (1)
where kth percentile ({Ri−c:i∈Ej}) is the k-th percentile signal measurement.
Referring to the example given above where the plurality of locations are associated with the spherical coverage of the DUT 802 and the received signal measurements are EIRPs, the metric for a transmission beam j may correspond to the k-th percentile of the distribution of radiated power measured over the full sphere around the DUT 802 while the DUT 802 is configured to transmit using the transmission beam j. For each transmission beam j, the testing device 804 may determine whether the k-th percentile signal measurement M_j of the signal measure measurements at the plurality of locations satisfies a predefined threshold, for example, represented by T_1. For instance, if the k-th percentile signal measurement M_j is less than the threshold T_1, the transmission beam j satisfies the interference condition. If, however, the k-the percent signal measurement M_j is greater than the threshold T_1, the transmission beam j does not satisfy the interference condition. Examples of CDFs of beam measurements and comparisons of a k-th percentile signal measurement against the threshold T_1 are discussed below with reference to
M_j′=kth percentile({Ri−c:i∈Ej}). (2)
In some aspects, the offset value c may be associated with an antenna gain of the DUT 802. In some instances, the offset value c may be a maximum transmit power, represented by Pmax, that can be transmitted by at the DUT 802. In other instances, the offset value c may be the maximum signal measurement (e.g., a peak measured EIRP) of the signal measurements Ej.
After determining the metric M_j′, the testing device 804 may compare M_j′ to a predefined threshold, for example, represented by T_2. If the k-th percentile signal measurement M_j′ is less than the threshold T_2, the transmission beam j satisfies the interference condition. If, however, the k-the percent signal measurement M_j′ is greater than the threshold T_2, the transmission beam j does not satisfy the interference condition. In some aspects, the value k for k-th percentile signal measurement to be used for the metric and/or the threshold T_2 may be determined based on operating parameter(s) and/or conditions(s) of the DUT 802 (e.g., the DUT 802 device power class and/or the maximum interference tolerance level of the DUT 802).
Further, in some aspects, the testing device 804 may determine to utilize the k-th percentile metric for determining whether the DUT 802 satisfies the interference condition when the transmit power of the DUT 802 exceeds a certain threshold. In other words, the testing device 804 may test for the interference condition as discussed at action 850 based on the transmit power of the DUT 802 exceeding a threshold, for example, represented by T_3. The testing device 804 may not test the interference condition as discussed at action 850 if the transmit power of the DUT 802 is below the threshold. In some aspects, the transmit power threshold T_3 may be dependent on operating parameters (e.g., frequency of operation, mobility conditions, type of wireless devices, device power class, class of services, interference tolerance levels, regulations, etc.) and conditions (e.g., density of wireless devices in the area of the DUT 802).
According to another aspect of the present disclosure, the metric(s) for determining whether the interference condition is satisfied may be based on multiple different percentiles of the signal measurements offset by an offset value. The multiple percentiles may include a p-th percentile, a q-the percentile, and a k-th percentile, where k is less than p and less than q. That is, k is less than a maximum of p and q (e.g., k<max (p, q)). The interference condition may be based on a first metric, represented by M_j,1, including a difference between a p-th percentile signal measurement and a q-th percentile signal measurement of the signal measurements for the transmission beam j at the plurality of locations. The first metric M_j,1 may be represented by:
M_j,1=pth percentile({Ri−c:i∈Ej})−qth percentile({Ri−c:i∈Ej}), (3)
where pth percentile ({Ri−c:i∈Ej}) is the p-th percentile signal measurement and the qth percentile ({Ri−c:i∈Ej}) is the q-th percentile signal measurement. In some aspects, the narrower the transmission beam (i.e., the lower the interference), the larger the first metric M_j,1.
Referring to the example given above where the plurality of locations are associated with the spherical coverage of the DUT 802 and the received signal measurements are EIRPs, the first metric for a transmission beam j may correspond to a difference between a p-th percentile and a q-th percentile of the distribution of radiated power measured over the full sphere around the DUT 802 while the DUT 802 is configured to transmit using the transmission beam j.
The testing device 804 may utilize a first criterion to test the interference condition for each transmission beam j. For instance, the testing device 804 may determine whether a difference (e.g., the metric M_j,1) between a p-th percentile signal measurement and a q-th percentile signal measurement the k-th percentile signal measurement of the signal measure measurements at the plurality of locations satisfies a first predefined threshold, for example, represented by T_4. For the first criterion, if the first metric M_j,1 is greater than the first threshold T_4, the transmission beam j satisfies the interference condition. If, however, first metric M_j,1 is less than the first threshold T_4, the transmission beam j does not satisfy the interference condition interference condition. In some aspects, the testing device 804 may determine the value p for the p-th percentile signal measurement, the value q for the q-th percentile signal measurement, and/or the first threshold T_4 based on operating parameters (e.g., frequency of operation, mobility conditions, type of wireless devices, device power class, class of services, interference tolerance levels, regulations, etc.) and conditions (e.g., density of wireless devices in the area of the DUT 802). In some aspects, the interference condition testing based on the difference between the p-th percentile signal measurement and the q-th percentile signal measurement may be referred to as a differential statistical approach.
In some instances, the p-th percentile may correspond to 100% percentile. Depending on the distribution of the plurality of locations, the signal measurements at the high percentile may be sparse. For instance, there may not be a sufficient number of signal measurements made at a certain region (e.g., an area projected by the main lobe). In such instances, it may be desirable for the testing device 804 to utilize an additional second metric, for example, represented by M_j,2, to determine whether the DUT 802 satisfies the interference condition. The second metric M_j,2 may be a k-th percentile signal measurement represented by:
M_j,2=kth percentile({Ri−c:i∈Ej}). (4)
where kth percentile ({Ri−c:i∈Ej}) is the k-th percentile signal measurement. As can be observed, M_j,2 is similar to equation (2) shown above.
The testing device 804 may utilize a second criterion to test the interference condition for each transmission beam j. For instance, the second criterion may determine whether the k-th percentile signal measurement satisfies a second predefined threshold, for example, represented by T_5. For the second criterion, if M_j,2 is less than the second threshold T_5, the transmission beam j satisfies the interference condition. If, however, M_j,2 is greater than the second threshold T_5, the transmission beam j does not satisfy the interference condition interference condition. In some aspects, the first wireless communication device may determine the value k for the k-th percentile signal and/or the second threshold T_5 based on operating parameters (e.g., frequency of operation, mobility conditions, type of wireless devices, device power class, class of services, interference tolerance levels, regulations, etc.) and conditions (e.g., density of wireless devices in the area of the DUT 802).
In some aspects, the testing device 804 may utilize a combination of the first criterion and the second criterions to determine whether the DUT 802 satisfies the interference condition. For instance, the testing device 804 may determine that the DUT 802 satisfies the interference condition if M_j,1 is greater than T_4 and M_j,2 is less than T_5. In other aspects, the testing device 804 may determine that the DUT 802 satisfies the interference condition if M_j,1 is greater than T_4 or M_j,2 is less than T_5. In some aspects, the narrower the transmission beam (i.e., the lower the interference), the larger the first metric M_j,1 and the smaller the metric M_j,2 when k is less than p and less than q.
Further, in some aspects, the testing device 804 may determine to utilize the statistical metrics M_j,1 and/or M_j,2 for determining whether the DUT 802 satisfies the interference condition when the transmit power of the DUT 802 exceeds a certain threshold. In other words, the testing device 804 may test for the interference condition as discussed at action 850 based on the transmit power of the DUT 802 exceeding a threshold, for example, represented by T_6. The testing device 804 may not test the interference condition as discussed at action 850 if the transmit power of the DUT 802 is below the threshold T_6. In some aspects, the transmit power threshold T_6 may be dependent on operating parameters (e.g., frequency of operation, mobility conditions, type of wireless devices, device power class, class of services, interference tolerance levels, regulations, etc.) and conditions (e.g., density of wireless devices in the area of the DUT 802).
Further, in some aspects, the testing device 804 may indicate to the DUT 802 whether the DUT 802 satisfies the interference condition based on the comparisons performed at action 850. The interference condition may correspond to a narrow beam condition, which may be used by the DUT 802 to select a channel access procedure when the DUT 802 operates in real-time (e.g., when communicating over a shared spectrum or licensed spectrum).
In general, the testing device 804 may determine an interference test metric (e.g., k-th percentile) and/or any comparison thresholds (e.g., T_4, T_5, and/or T_6) discussed above based on operating parameters (e.g., frequency of operation, mobility conditions, type of wireless devices, device power class, class of services, interference tolerance levels, regulations, etc.) and conditions (e.g., density of wireless devices in the area of the DUT 802).
While the method 800 is described in the context of off-line testing, for example, during conformance testing or manufacturing testing, aspects are not limited thereto. For instance, in some aspects, a first wireless communication device may perform the operations of testing device 804 to provide a second wireless communication device with information related interference conditions of various transmission beams of the second wireless communication device, for example, during an interference measurement procedure.
In some aspects, the criteria to determine whether the wireless communication device satisfies an interference condition (e.g., a narrow beam condition) is based on whether a difference between a p-th percentile signal measurement and a q-th percentile measurement of the CDF satisfies a first threshold (e.g., greater than the first threshold T_4) and whether a k-th percentile signal measurement of the CDF satisfies a second threshold (e.g., less than the second threshold T_5). In the illustrative example of
In some aspects, the criteria to determine whether the wireless communication device satisfies an interference condition (e.g., a narrow beam condition) is based whether a k-th percentile signal measurement of the CDF satisfies a threshold (e.g., less than the threshold). In the illustrative example of
In some aspects, the CDF curves 1010, 1020, 1030 may represent CDFs of receive signal power measurements (e.g., EIRPs) of the wireless communication device. Referring to the example discussed above with reference to
At a high level, in the method 1100, a wireless communication device may utilize similar metric(s) (e.g., a p-th percentile signal measurement, a q-th percentile signal measurement, and a k-th percentile signal measurement) and interference condition discussed above in the method 800 with reference to
At block 1110, a wireless communication device (e.g., a BS 105, 205, 1200, a UE 115, 215, or a wireless communication device 1300) may determine whether an interference condition is satisfied. The interference condition may be related to the narrowness of a transmission beam to be used for transmitting a communication signal in a shared spectrum or unlicensed spectrum. The narrowness of the transmission beam may be in terms of its interference to surrounding nodes. In some instances, the transmission beam may be similar to the transmission beam 202 discussed above with reference to
In some aspects, the determination of whether the interference condition is satisfied may be based on the differential statistical approach as discussed above with reference to
In some aspects, the wireless communication device may have one or more CDF tables 1102 and/or one or more thresholds 1104 stored at a memory (e.g., the memory 1204 and 1304) of the wireless communication device. For instance, in some aspects, a first CDF table 1102 of the CDF tables 1102 may be a CDF of signal measurements associated with the transmission beam. The signal measurements may be offset by an offset value associated with an antenna array gain of the wireless communication device as discussed above with reference to
The wireless communication device may determine whether the interference condition is satisfied based on whether the difference between the p-th percentile signal measurement and the q-th percentile signal measurement satisfies the first selected threshold and/or whether the k-th percentile signal measurement satisfies the second selected threshold. In one aspect, if the difference between the p-th percentile signal measurement and the q-th percentile signal measurement is greater than the first selected threshold, the transmission beam satisfies the interference condition. If, however, the difference between the p-th percentile signal measurement and the q-th percentile signal measurement is less than the first selected threshold is greater than the second selected threshold, the transmission beam does not satisfy the interference condition. In another aspect, if the k-th percentile signal measurement is less than the second selected threshold, the transmission beam satisfies the interference condition. If, however, the k-th percentile signal measurement is greater than the second selected threshold is greater than the second selected threshold, the transmission beam does not satisfy the interference condition. In yet another aspect, if the difference between the p-th percentile signal measurement and the q-th percentile signal measurement is greater than the first selected threshold and the k-th percentile signal measurement is less than the second selected threshold, the transmission beam satisfies the interference condition. If, however, the difference between the p-th percentile signal measurement and the q-th percentile signal measurement is less than the first selected threshold is greater than the second selected threshold or and the k-th percentile signal measurement is greater than the second selected threshold, the transmission beam does not satisfy the interference condition.
In some aspects, the wireless communication device may determine the value p for p-th percentile signal measurement, the value q for q-th percentile signal measurement, the value k for k-th percentile signal measurement, the first threshold, and/or the second threshold based on operating parameter(s) and/or conditions(s) of the wireless communication device. The operating parameter(s) and/or conditions(s) may include, but are not limited to, a device power class of the wireless communication device, regulations that regulate a frequency band to be used for transmitting the communication signal, mobility conditions, class of services, and/or interference tolerance level (e.g., a maximum interference tolerance level) of the wireless communication device.
In some aspects, a second CDF table 1102 of the one or more CDF tables 1102 may also be associated with the transmission beam (to be used for transmitting the communication signal), but may be associated with a different operating condition. For instance, the first CDF table 1102 may be for operating in a frequency band regulated by a regulation A, and the second CDF table 1102 may be for operating in a frequency band regulated by a regulation B. As such, the wireless communication device may select a CDF table 1102 from the one or more CDF tables 1102 based on an operating condition (to be used for the transmission), and may determine the p-th percentile signal measurement, the q-th percentile signal measurement, and the k-th percentile signal measurement from the selected CDF table 1102.
In some aspects, the determination of whether the interference condition is satisfied may be based on the singular statistical approach as discussed above with reference to
At block 1120, if the narrow beam condition is satisfied, the wireless communication device may utilize a first set of channel access procedures for transmitting a communication signal in the shared spectrum or unlicensed spectrum. In some aspects, the first set of channel access procedures may include a channel access without performing an LBT and/or long-term sensing. That is, the wireless communication device may transmit the communication signal without an LBT and/or long-term sensing. In some aspects, the first set of channel access procedures may also include various restrictions on the transmission power, the transmission duty cycle, and/or the beam dwell time that the wireless communication device may use.
If, however, the narrow beam condition is not satisfied, the wireless communication device may proceed to block 1130. At block 1130, the wireless communication device may utilize a second set of channel access procedures for transmitting a communication signal in the shared spectrum or unlicensed spectrum. In some aspects, the second set of channel access procedures may include a channel access after a successful LBT and/or a low interference detection from long-term sensing. That is, the wireless communication device may perform an LBT or long-term sensing prior to transmitting the communication signal and may transmit the communication signal if the LBT indicates clearance in the channel for transmission and/or the long-term sensing indicates that the wireless communication device may not cause interference to surrounding nodes. In some aspects, the first set of channel access procedures may also include various restrictions on the transmission power, the transmission duty cycle, and/or the beam dwell time that the wireless communication device may use.
Further, in some aspects, the wireless communication device may utilize the k-th percentile signal measurement to determine whether the wireless communication device satisfies the interference condition when the transmit power to be used for transmitting the communication signal exceeds a certain threshold. That is, if the transmit power (to be used for transmitting the communication signal) does not exceed the threshold, the wireless communication device may skip the block 1110 and proceed to block 1120 and utilize the first set of channel access procedure(s) (e.g., with no LBT and/or no long-term sensing) to access the channel for transmitting the communication signal.
The processor 1202 may have various features as a specific-type processor. For example, these may include a CPU, a DSP, an ASIC, a controller, a FPGA device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein. The processor 1202 may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
The memory 1204 may include a cache memory (e.g., a cache memory of the processor 1202), RAM, MRAM, ROM, PROM, EPROM, EEPROM, flash memory, a solid state memory device, one or more hard disk drives, memristor-based arrays, other forms of volatile and non-volatile memory, or a combination of different types of memory. In some aspects, the memory 1204 may include a non-transitory computer-readable medium. The memory 1204 may store instructions 1206. The instructions 1206 may include instructions that, when executed by the processor 1202, cause the processor 1202 to perform operations described herein, for example, aspects of
The interference module 1208 may be implemented via hardware, software, or combinations thereof. For example, the interference module 1208 may be implemented as a processor, circuit, and/or instructions 1206 stored in the memory 1204 and executed by the processor 1202. In some examples, the interference module 1208 can be integrated within the modem subsystem 1212. For example, the interference module 1208 can be implemented by a combination of software components (e.g., executed by a DSP or a general processor) and hardware components (e.g., logic gates and circuitry) within the modem subsystem 1212. The interference module 1208 may communicate with one or more components of BS 1200 to implement various aspects of the present disclosure, for example, aspects of
In some aspects, the interference module 1208 is configured to determine whether a DUT (e.g., a DUT 802, a UE 115, 215, a wireless communication device 1300, a BS 105, 205) satisfies an interference condition (e.g., a narrow beam condition), for example, during conformance testing or manufacturing testing. For example, the transceiver 1210 is configured to receive, from the DUT via the antennas 1216, one or more signals associated with a beam parameter (e.g., a beam direction of a transmission beam of the DUT). The one or more signals may be received from a plurality of locations, each at a respective azimuth angle and a respective elevation angle with respect to the DUT. In some aspects, the antennas 1216 may be arranged in a spherical pattern as described above with reference to
Additionally or alternatively, the processor 1202 is configured to obtain a k-th percentile signal measurement from the CDF, where k<p and k<q, and compare the k-th percentile signal measurement to a second threshold as discussed above reference to
In some aspects, the interference module 1208 is configured to select a channel access configuration (e.g., channel access parameters or procedures) for transmitting a communication signal in an unlicensed frequency band using a transmission beam during operation (in real-time). For example, the processor 1202 is configured to perform the selection based on multiple percentiles of signal measurements of a transmission beam at a plurality of locations as discussed above with reference to
In some aspects, the BS 1200 is configured with one or more tables of CDF(s) of signal measurements stored at the memory 1204, and the interference module 1208 is configured to obtain the p-th percentile signal measurement, the q-th percentile signal measurement, and/or the k-th percentile signal measurement by performing a table lookup from the stored CDF tables.
In some aspects, the interference module 1208 is configured to facilitate testing of the BS 1200 (e.g., operating as a DUT 802) as discussed above with reference to
As shown, the transceiver 1210 may include the modem subsystem 1212 and the RF unit 1214. The transceiver 1210 can be configured to communicate bi-directionally with other devices, such as the UEs 115 and/or BS 1200 and/or another core network element. The modem subsystem 1212 may be configured to modulate and/or encode data according to a MCS, e.g., a LDPC coding scheme, a turbo coding scheme, a convolutional coding scheme, a digital beamforming scheme, etc. The RF unit 1214 may be configured to process (e.g., perform analog to digital conversion or digital to analog conversion, etc.) modulated/encoded data (e.g., narrow transmission beams, interference test beams, interference test results, RRC configurations, MIB, SIB, PDSCH data and/or PDCCH DCIs, etc.) from the modem subsystem 1212 (on outbound transmissions) or of transmissions originating from another source such as a UE 115, 215, and/or wireless communication device 1300. The RF unit 1214 may be further configured to perform analog beamforming in conjunction with the digital beamforming. Although shown as integrated together in transceiver 1210, the modem subsystem 1212 and/or the RF unit 1214 may be separate devices that are coupled together at the BS 1200 to enable the BS 1200 to communicate with other devices.
The RF unit 1214 may provide the modulated and/or processed data, e.g. data packets (or, more generally, data messages that may contain one or more data packets and other information), to the antennas 1216 for transmission to one or more other devices. The antennas 1216 may further receive data messages transmitted from other devices and provide the received data messages for processing and/or demodulation at the transceiver 1210. The transceiver 1210 may provide the demodulated and decoded data (e.g., narrow transmission beams, interference test beams, interference test results, PUSCH data, PUCCH UCI, MSG1, MSG3, etc.) to the interference module 1208 for processing. The antennas 1216 may include multiple antennas of similar or different designs in order to sustain multiple transmission links.
In an aspect, the BS 1200 can include multiple transceivers 1210 implementing different RATs (e.g., NR and LTE). In an aspect, the BS 1200 can include a single transceiver 1210 implementing multiple RATs (e.g., NR and LTE). In an aspect, the transceiver 1210 can include various components, where different combinations of components can implement different RATs.
The processor 1302 may include a central processing unit (CPU), a digital signal processor (DSP), an application specific integrated circuit (ASIC), a controller, a field programmable gate array (FPGA) device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein. The processor 1302 may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
The memory 1304 may include a cache memory (e.g., a cache memory of the processor 1302), random access memory (RAM), magnetoresistive RAM (MRAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read only memory (EPROM), electrically erasable programmable read only memory (EEPROM), flash memory, solid state memory device, hard disk drives, other forms of volatile and non-volatile memory, or a combination of different types of memory. In an aspect, the memory 1304 includes a non-transitory computer-readable medium. The memory 1304 may store, or have recorded thereon, instructions 1306. The instructions 1306 may include instructions that, when executed by the processor 1302, cause the processor 1302 to perform the operations described herein with reference to a UE 115 or an anchor in connection with aspects of the present disclosure, for example, aspects of
The interference module 1308 may be implemented via hardware, software, or combinations thereof. For example, the interference module 1308 may be implemented as a processor, circuit, and/or instructions 1306 stored in the memory 1304 and executed by the processor 1302. In some aspects, the interference module 1308 can be integrated within the modem subsystem 1312. For example, the interference module 1308 can be implemented by a combination of software components (e.g., executed by a DSP or a general processor) and hardware components (e.g., logic gates and circuitry) within the modem subsystem 1312. The interference module 1308 may communicate with one or more components of wireless communication device 1300 to implement various aspects of the present disclosure, for example, aspects of
In some aspects, the interference module 1308 is configured to facilitate testing of the wireless communication device 1300 (e.g., operating as a DUT 802) as discussed above with reference to
In some aspects, the interference module 1308 is configured to select a channel access configuration (e.g., channel access parameters or procedures) for transmitting a communication signal in an unlicensed frequency band using a transmission beam during operation (in real-time). For example, the processor 1302 is configured to perform the selection based on multiple percentiles of signal measurements of a transmission beam at a plurality of locations as discussed above with reference to
In some aspects, the wireless communication device 1300 is configured with one or more tables of CDF of signal measurements stored at the memory 1304, and the interference module 1308 is configured to obtain the p-th percentile signal measurement, the q-th percentile signal measurement, and/or the k-th percentile signal measurement by performing a table lookup from the stored CDF tables.
As shown, the transceiver 1310 may include the modem subsystem 1312 and the RF unit 1314. The transceiver 1310 can be configured to communicate bi-directionally with other devices, such as the BSs 105 and 1420. The modem subsystem 1312 may be configured to modulate and/or encode the data from the memory 1304 and/or the interference module 1308 according to a modulation and coding scheme (MCS), e.g., a low-density parity check (LDPC) coding scheme, a turbo coding scheme, a convolutional coding scheme, a digital beamforming scheme, etc. The RF unit 1314 may be configured to process (e.g., perform analog to digital conversion or digital to analog conversion, etc.) modulated/encoded data (e.g., narrow beam transmissions, beam measurement signals, PUSCH data, PUCCH UCI, MSG1, MSG3, etc.) or of transmissions originating from another source such as a UE 115, a BS 105, or an anchor. The RF unit 1314 may be further configured to perform analog beamforming in conjunction with the digital beamforming. Although shown as integrated together in transceiver 1310, the modem subsystem 1312 and the RF unit 1314 may be separate devices that are coupled together at the wireless communication device 1300 to enable the wireless communication device 1300 to communicate with other devices.
The RF unit 1314 may provide the modulated and/or processed data, e.g. data packets (or, more generally, data messages that may contain one or more data packets and other information), to the antennas 1316 for transmission to one or more other devices. The antennas 1316 may further receive data messages transmitted from other devices. The antennas 1316 may provide the received data messages for processing and/or demodulation at the transceiver 1310. The transceiver 1310 may provide the demodulated and decoded data (e.g., channel access procedure configurations, interference test results, RRC configurations, MIB, SIB, PDSCH data and/or PDCCH DCIs, etc.) to the interference module 1308 for processing. The antennas 1316 may include multiple antennas of similar or different designs in order to sustain multiple transmission links.
In an aspect, the wireless communication device 1300 can include multiple transceivers 1310 implementing different RATs (e.g., NR and LTE). In an aspect, the wireless communication device 1300 can include a single transceiver 1310 implementing multiple RATs (e.g., NR and LTE). In an aspect, the transceiver 1310 can include various components, where different combinations of components can implement different RATs.
At block 1410, a first wireless communication device receives, from a second wireless communication device, one or more signals associated with a beam parameter. In some aspects, the first wireless communication device may be similar to the BSs 105, 205, and/or 1200 or the UEs 115, 215, and/or the wireless communication device 1300. The first wireless communication device may be configured to operate as a testing device similar to the testing device 804. In some aspects, the one or more receive signals may include CSI-RS(s), SSB(s), beam measurement signals, and/or any predetermined waveform signals that can facilitate receive signal measurements (e.g., EIRPs) at a testing device such as the testing device 804. In some aspects, the beam parameter may be associated with a transmission beam (e.g., the beam 202 of
At block 1420, the first wireless communication device determines, at each of a plurality of locations, a signal measurement for at least one received signal of the one or more received signals. For instance, the first wireless communication device may receive at least one signal of the one or more signals at each location of the plurality of locations (e.g., via a RF sensor at each location or a TRP at each location), and may calculate a received signal power (e.g., EIRP) of the signal received at each location. In some aspects, the first wireless communication device may determine signal measurements for multiple locations at one time. In other aspects, the first wireless communication device may determine a signal measurement for one location at any given time. In some aspects, the plurality of locations is associated with a spherical coverage of the second wireless communication device, for example, as shown in
At block 1430, the first wireless communication device determines, based at least in part on a p-th percentile signal measurement and a q-th percentile signal measurement of the signal measurements at the plurality of locations, whether the second wireless communication device satisfies an interference condition. In some aspects, as part of determining whether the second wireless communication device satisfies the interference condition, the first wireless communication device may further determine whether a difference between the p-th percentile signal measurement and the q-th percentile signal measurement of the signal measurements at the plurality of locations satisfies a threshold (e.g., T_4). For instance, if the difference between the p-th percentile signal measurement and the q-th percentile signal measurement of the signal measurements at the plurality of locations is greater than the threshold T_4, then the interference condition is satisfied. If, however, the difference between the p-th percentile signal measurement and the q-th percentile signal measurement of the signal measurements at the plurality of locations is below the threshold T_4, then the interference condition is not satisfied. In some aspects, the threshold T_4 is based on an operating parameter associated with the second wireless communication device. In some aspects, at least one of a value of p for the p-th percentile signal measurement or a value of q for the q-th percentile signal measurement is based on an operating parameter (e.g., frequency of operation, mobility conditions, type of wireless devices, device power class, class of services, interference tolerance levels, regulations, etc.) associated with the second wireless communication device. Additionally or alternatively, in some aspects, as part of determining whether the second wireless communication device satisfies the interference condition, the first wireless communication device may determine whether a k-th percentile signal measurement of the signal measurements at the plurality of locations is less than a second threshold (e.g., T_5), where a value of k is less than a maximum value of a value of p and a value of q (e.g., k<max (p, q). In some aspects, means for performing the functionality of block 1430 can, but not necessarily, include, for example, interference module 1208, transceiver 1210, antennas 1216, processor 1202, and/or memory 1204 with reference to
In some aspects, the first wireless communication device may further determine the p-th percentile signal measurement and the q-th percentile signal measurement of the signal measurements at the plurality of locations based on a cumulative distribution function (CDF) of the signal measurements at the plurality of locations.
In some aspects, the first wireless communication device may further apply an offset value to each signal measurement of the signal measurements at the plurality of locations, and determine the p-th percentile signal measurement and the q-th percentile signal measurement of the signal measurements at the plurality of locations after applying the offset value to each signal measurement. In some aspects, the offset value may be associated with an antenna gain of the second wireless communication device. For instance, the offset value may be a maximum transmit power of the second wireless communication device. In other instances, the offset value may be a maximum signal measurement of the signal measurements. For instance, the signal measurements are EIRPs, and the offset value is the peak EIRP of the EIRPs.
In some aspects, the determining whether the second wireless communication device satisfies the interference condition based on the p-th percentile signal measurement and the q-th percentile signal measurement of the signal measurements at the plurality of locations at block 1430 is based on a transmit power associated with the second wireless communication device satisfying a threshold. For instance, if the transmit power associated with the second wireless communication device (e.g., used by the second wireless communication device for transmitting the one or more received signals) exceeds the threshold, then the wireless communication device may perform the test for the interference condition. In some aspects, the threshold transmit power is dependent on operating parameters (e.g., frequency of operation, mobility conditions, type of wireless devices, device power class, class of services, interference tolerance levels, regulations, etc.) of the second wireless communication device.
In some aspects, as part of determining whether the second wireless communication device satisfies the interference condition at block 1430, the wireless communication device may determine whether the second wireless communication device satisfies a narrow beam condition based on the p-th percentile signal measurement and the q-th percentile signal measurement.
At block 1510, a wireless communication device selects a channel access configuration for transmitting a communication signal in an unlicensed frequency band using a transmission beam, The selecting the channel access configuration is based at least in part on a p-th percentile signal measurement and a q-th percentile signal measurement of signal measurements associated with the transmission beam. The signal measurements include one signal measurement at each of a plurality of locations. In some aspects, the first wireless communication device may be similar to the BSs 105, 205, and/or 1200 or the UEs 115, 215, and/or the wireless communication device 1300. In some aspects, means for performing the functionality of block 1510 can, but not necessarily, include, for example, interference module 1208, transceiver 1210, antennas 1216, processor 1202, and/or memory 1204 with reference to
In some aspects, the wireless communication device may determine the p-th percentile signal measurement and the q-th percentile signal measurement of the signal measurements at the plurality of locations based on a CDF of the signal measurements. In some aspects, as part of determining the p-th percentile signal measurement and the q-th percentile signal measurement of the signal measurements at the plurality of locations based on the CDF, the wireless communication device may perform a table lookup to obtain the at least one of the p-th percentile signal measurement or the q-th percentile signal measurement (e.g., from CDF tables 1102 as discussed above with reference to
In some aspects, the selecting the channel access configuration at block 1510 is further based on a comparison of a difference between the p-th percentile signal measurement and the q-th percentile signal measurement of the signal measurements at the plurality of locations against a threshold (e.g., T_1). In some aspects, the threshold T_1 is based on an operating parameter of the wireless communication device. In some aspects, at least one of a value of p for the p-th percentile signal measurement or a value of q for the q-th percentile signal measurement of the signal measurements at the plurality of locations is based on an operating parameter (e.g., frequency of operation, mobility conditions, type of wireless devices, device power class, class of services, interference tolerance levels, regulations, etc.) of the wireless communication device. Additionally or alternatively, in some aspects, as part of selecting the channel access configuration, the first wireless communication device may further determine whether a k-th percentile signal measurement of the signal measurements at the plurality of locations is less than a second threshold, wherein a value of k is greater less than a maximum value of a value of p and a value of q (e.g., k<max (p, q)).
At block 1520, the wireless communication device transmits, based on the channel access configuration and using the transmission beam, the communication signal in the unlicensed frequency band. In some aspects, the wireless communication device may transmit, using the transmission beam without performing channel sensing based on the channel configuration, the communication signal. For example, when the difference between p-th percentile signal measurement and the q-th percentile signal measurement greater than a first threshold (e.g., T_1) and/or when the k-th percentile signal measurement is less than a second threshold (e.g., T_2), the wireless communication device may select a channel access configuration that allows channel access without an LBT and/or long-term sensing. In some aspects, means for performing the functionality of block 1520 can, but not necessarily, include, for example, interference module 1208, transceiver 1210, antennas 1216, processor 1202, and/or memory 1204 with reference to
In some aspects, the selecting the channel access configuration based at least in part on the k-th percentile signal measurement of the signal measurements at block 1520 is based on a transmit power to be used for transmitting the communication signal satisfying a threshold. For instance, if the transmit power to be used for transmitting the communication signal at block 1520 exceeds the threshold, the wireless communication device may perform the channel access configuration selection at block 1510. If, however, the transmit power to be used for transmitting the communication signal at block 1520 is below the threshold, the wireless communication device may not perform the channel access configuration selection at block 1510 (e.g., the wireless communication device may transmit the communication signal using the transmission beam at block 1520 without performing an LBT and/or long-term sensing). In some aspects, the threshold is based on an operating parameter (e.g., frequency of operation, mobility conditions, type of wireless devices, device power class, class of services, interference tolerance levels, regulations, etc.) of the wireless communication device.
At block 1610, a first wireless communication device receives, from a second wireless communication device, one or more signals associated with a beam parameter. In some aspects, the first wireless communication device may be similar to the BSs 105, 205, and/or 1200 or the UEs 115, 215, and/or the wireless communication device 1300. The first wireless communication device may be configured to operate as a testing device similar to the testing device 804. In some aspects, the one or more receive signals may include CSI-RS(s), SSB(s), beam measurement signals, and/or any predetermined waveform signals that can facilitate receive signal measurements (e.g., EIRPs) at a testing device such as the testing device 804. In some aspects, the beam parameter may be associated with a transmission beam (e.g., the beam 202 of
At block 1620, the first wireless communication device determines, at each of a plurality of locations, a signal measurement for at least one received signal of the one or more received signals. For instance, the first wireless communication device may receive at least one receive signal of the one or more received signals at each location of the plurality of locations (e.g., via a RF sensor at each location or a TRP at each location), and may calculate a received signal power (e.g., EIRP) of the signal received at each location. In some aspects, the first wireless communication device may determine signal measurements for multiple locations at one time. In other aspects, the first wireless communication device may determine a signal measurement for one location at any given time. In some aspects, the plurality of locations is associated with a spherical coverage of the second wireless communication device, for example, as shown in
At block 1630, the first wireless communication device determines, based on a k-th percentile signal measurement of the signal measurements at the plurality of locations, whether the second wireless communication device satisfies an interference condition. In some aspects, as part of determining whether the second wireless communication device satisfies the interference condition at block 1630, the first wireless communication device may further determine whether the k-th percentile signal measurement of the signal measurements at the plurality of locations satisfies a threshold. In some aspects, the threshold, and/or a value of k for the k-th percentile signal measurement of the signal measurements at the plurality of locations are based on an operating parameter (e.g., frequency of operation, mobility conditions, type of wireless devices, device power class, class of services, interference tolerance levels, regulations, etc.) associated with the second wireless communication device. In some aspects, means for performing the functionality of block 1630 can, but not necessarily, include, for example, interference module 1208, transceiver 1210, antennas 1216, processor 1202, and/or memory 1204 with reference to
In some aspects, the first wireless communication device may further determine the k-th percentile signal measurement of the signal measurements at the plurality of locations based on a cumulative distribution function (CDF) of the signal measurements at the plurality of locations.
In some aspects, the first wireless communication device may further apply an offset value to each signal measurement of the signal measurements at the plurality of locations, and determine the k-th percentile signal measurement of the signal measurements at the plurality of locations after applying the offset value to each signal measurement. In some aspects, the offset value may be associated with an antenna gain of the second wireless communication device. For instance, the offset value may be a maximum transmit power of the second wireless communication device. In other instances, the offset value may be a maximum signal measurement of the signal measurements. For instance, the signal measurements are EIRPs, and the offset value is the peak EIRP of the EIRPs. In some aspects, the wireless communication device may apply the offset value to each signal measurement based on the one or more received signals being associated with a transmit power (e.g., a transmit power used by the second wireless communication device for transmitting the one or more received signals) that exceeds a threshold transmit power. In some aspects, the threshold transmit power is dependent on operating parameters (e.g., frequency of operation, mobility conditions, type of wireless devices, device power class, class of services, interference tolerance levels, regulations, etc.) of the second wireless communication device.
In some aspects, the determining whether the second wireless communication device satisfies the interference condition based on the k-th percentile signal measurement of the signal measurements at the plurality of locations at block 1630 is based on a transmit power associated with the second wireless communication device satisfying a threshold. For instance, if the transmit power associated with the second wireless communication device (e.g., used by the second wireless communication device for transmitting the one or more received signals) exceeds the threshold, then the wireless communication device may perform the test for the interference condition. In some aspects, the threshold for the transmit power is based on an operating parameter (e.g., frequency of operation, mobility conditions, type of wireless devices, device power class, class of services, interference tolerance levels, regulations, etc.) associated with the second wireless communication device.
In some aspects, as part of determining whether the second wireless communication device satisfies the interference condition at block 1630, the wireless communication device may determine whether the second wireless communication device satisfies a narrow beam condition based on the k-th percentile signal measurement.
At block 1710, a wireless communication device selects a channel access configuration for transmitting a communication signal in an unlicensed frequency band using a transmission beam. The selecting the channel access configuration is based at least in part on a k-th percentile signal measurement of signal measurements associated with the transmission beam. The signal measurements include one signal measurement at each of a plurality of locations. In some aspects, the first wireless communication device may be similar to the BSs 105, 205, and/or 1200 or the UEs 115, 215, and/or the wireless communication device 1300. In some aspects, means for performing the functionality of block 1710 can, but not necessarily, include, for example, interference module 1208, transceiver 1210, antennas 1216, processor 1202, and/or memory 1204 with reference to
In some aspects, the wireless communication device may determine the k-th percentile signal measurement of the signal measurements at the plurality of locations based on a cumulative distribution function (CDF) of the signal measurements. In some aspects, as part of determining the k-th percentile signal measurement of the signal measurements at the plurality of locations based on the CDF, the wireless communication device may perform a table lookup to obtain the k-th percentile signal measurement (e.g., from CDF tables 1102 as discussed above with reference to
In some aspects, the selecting the channel access configuration is further based on a comparison of the k-th percentile signal measurement of the signal measurements at the plurality of locations against a threshold. In some aspects, the threshold and/or a value of k for the k-th percentile signal measurement of the signal measurements at the plurality of locations is based on an operating parameter (e.g., frequency of operation, mobility conditions, type of wireless devices, device power class, class of services, interference tolerance levels, regulations, etc.) of the wireless communication device.
At block 1720, the wireless communication device transmits, based on the channel access configuration and using the transmission beam, the communication signal in the unlicensed frequency band. In some aspects, the wireless communication device may transmit, using the transmission beam without performing channel sensing based on the channel configuration, the communication signal. For example, when the k-th percentile signal measurement of signal measurements associated with the transmission beam satisfies a certain threshold, the wireless communication device may select a channel access configuration that allow channel access without an LBT and/or long-term sensing. In some aspects, means for performing the functionality of block 1720 can, but not necessarily, include, for example, interference module 1208, transceiver 1210, antennas 1216, processor 1202, and/or memory 1204 with reference to
In some aspects, the selecting the channel access configuration based at least in part on the k-th percentile signal measurement of the signal measurements at block 1710 is based on a transmit power to be used for transmitting the communication signal satisfying a threshold. For instance, if the transmit power to be used for transmitting the communication signal at block 1720 exceeds the threshold, the wireless communication device may perform the channel access configuration selection at block 1710. If, however, the transmit power to be used for transmitting the communication signal at block 1720 is below the threshold, the wireless communication device may not perform the channel access configuration selection at block 1710 (e.g., the wireless communication device may transmit the communication signal using the transmission beam at block 1720 without performing an LBT and/or long-term sensing). In some aspects, the threshold is based on an operating parameter (e.g., frequency of operation, mobility conditions, type of wireless devices, device power class, class of services, interference tolerance levels, regulations, etc.) of the wireless communication device.
Further aspects of the present disclosure include the following.
Aspect 1 includes a method of wireless communication performed by a first wireless communication device, the method comprising receiving, from a second wireless communication device, one or more signals associated with a beam parameter; determining, at each of a plurality of locations, a signal measurement for at least one received signal of the one or more received signals; and determining, based at least in part on an p-th percentile signal measurement and a q-th percentile signal measurement of the signal measurements at the plurality of locations, whether the second wireless communication device satisfies an interference condition.
Aspect 2 includes the method of aspect 1, wherein the plurality of locations is associated with a spherical coverage of the second wireless communication device.
Aspect 3 includes the method of any of aspects 1-2, wherein the determining the signal measurement at each of the plurality of locations comprises determining the signal measurement at a respective azimuth angle and a respective elevation angle with respect to the second wireless communication device.
Aspect 4 includes the method of any of aspects 1-3, wherein the azimuth angles and the elevation angles associated with the plurality of locations are based on an operating parameter of the second wireless communication device.
Aspect 5 includes the method of any of aspects 1-4, wherein the determining the signal measurement at each of the plurality of locations comprises determining an effective isotropic radiated power (EIRP) for the at least one received signal.
Aspect 6 includes the method of any of aspects 1-5, further comprising determining the p-th percentile signal measurement and the q-th percentile signal measurement of the signal measurements at the plurality of locations based on a cumulative distribution function (CDF) of the signal measurements at the plurality of locations.
Aspect 7 includes the method of any of aspects 1-6, wherein the determining whether the second wireless communication device satisfies the interference condition comprises determining whether a difference between the p-th percentile signal measurement and the q-th percentile signal measurement of the signal measurements at the plurality of locations satisfies a threshold.
Aspect 8 includes the method of any of aspects 1-7, wherein the threshold is based on an operating parameter associated with the second wireless communication device.
Aspect 9 includes the method of any of aspects 1-8, wherein at least one of a value of p for the p-th percentile signal measurement or a value of q for the q-th percentile signal measurement is based on an operating parameter associated with the second wireless communication device.
Aspect 10 includes the method of any of aspects 1-9, wherein the determining whether the second wireless communication device satisfies the interference condition further comprises at least one of determining whether a difference between the p-th percentile signal measurement and the q-th percentile signal measurement of the signal measurements at the plurality of locations is greater than a first threshold; or determining whether a k-th percentile signal measurement of the signal measurements at the plurality of locations is less than a second threshold, wherein a value of k is less than a maximum value of a value of p and a value of q.
Aspect 11 includes the method of any of aspects 1-10, wherein the determining whether the second wireless communication device satisfies the interference condition comprises determining whether the second wireless communication device satisfies a narrow beam condition based on the p-th percentile signal measurement and the q-th percentile signal measurement.
Aspect 12 includes the method of any of aspects 1-11, wherein the determining whether the second wireless communication device satisfies the interference condition based at least in part on the p-th percentile signal measurement and the q-th percentile signal measurement of the signal measurements at the plurality of locations is based on a transmit power associated with the second wireless communication device satisfying a threshold.
Aspect 13 includes the method of any of aspects 1-12, wherein the threshold is based on an operating parameter associated with the second wireless communication device.
Aspect 14 includes a method of wireless communication performed by a wireless communication device, the method comprising selecting a channel access configuration for transmitting a communication signal in an unlicensed frequency band using a transmission beam, wherein the selecting is based at least in part on an p-th percentile signal measurement and a q-th percentile signal measurement of signal measurements associated with the transmission beam, wherein the signal measurements include one signal measurement at each of a plurality of locations; and transmitting, based on the channel access configuration and using the transmission beam, the communication signal in the unlicensed frequency band.
Aspect 15 includes the method of aspect 14, wherein the selecting the channel access configuration is further based on a comparison of a difference between the p-th percentile signal measurement and the q th percentile signal measurement of the signal measurements at the plurality of locations against a threshold.
Aspect 16 includes the method of any of aspects 14-15, wherein the threshold is based on an operating parameter of the wireless communication device.
Aspect 17 includes the method of any of aspects 14-16, wherein at least one of a value of p for the p-th percentile signal measurement or a value of q for the q-th percentile signal measurement of the signal measurements at the plurality of locations is based on an operating parameter of the wireless communication device.
Aspect 18 includes the method of any of aspects 14-17, further comprising determining at least one of the p-th percentile signal measurement or the q-th percentile signal measurement of the signal measurements at the plurality of locations based on a cumulative distribution function (CDF) of the signal measurements.
Aspect 19 includes the method of any of aspects 14-18, wherein the determining the at least one of the p-th percentile signal measurement or the q-th percentile signal measurement of the signal measurements at the plurality of locations based on the CDF comprises performing a table lookup to obtain the at least one of the p-th percentile signal measurement or the q-th percentile signal measurement.
Aspect 20 includes the method of any of aspects 14-19, wherein the selecting the channel access configuration further comprises at least one of determining whether a difference between the p-th percentile signal measurement and the q-th percentile signal measurement of the signal measurements at the plurality of locations is greater than a first threshold; or determining whether a k-th percentile signal measurement of the signal measurements at the plurality of locations is less than a second threshold, wherein a value of k is less than a maximum value of a value of p and a value of q.
Aspect 21 includes the method of any of aspects 14-20, wherein the transmitting the communication signal comprises transmitting, based on the channel access configuration, the communication signal using the transmission beam without performing channel sensing.
Aspect 22 includes the method of any of aspects 14-21, wherein the selecting the channel access configuration based at least in part on the p-th percentile signal measurement and the q-th percentile signal measurement of the signal measurements is based on a transmit power to be used for transmitting the communication signal satisfying a threshold.
Aspect 23 includes the method of any of aspects 14-22, wherein the threshold is based on an operating parameter of the wireless communication device.
Aspect 24 includes a wireless communication device comprising a transceiver, a memory, and a processor coupled to the transceiver and the memory, the wireless communication device configured to perform any one of aspects 1-13.
Aspect 25 includes a wireless communication device comprising a transceiver, a memory, and a processor coupled to the transceiver and the memory, the wireless communication device configured to perform any one of aspects 14-23.
Aspect 26 includes a non-transitory computer readable medium including program code, which when executed by one or more processors, causes a wireless communication device to perform the method of any one of aspects 1-13.
Aspect 27 includes a non-transitory computer readable medium including program code, which when executed by one or more processors, causes a wireless communication device to perform the method of any one of aspects 14-23.
Aspect 28 includes an apparatus comprising means for performing the method of any one of aspects 1-13.
Aspect 29 includes an apparatus comprising means for performing the method of any one of aspects 14-23.
Information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
The various illustrative blocks and modules described in connection with the disclosure herein may be implemented or performed with a general-purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).
The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described above can be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations. Also, as used herein, including in the claims, “or” as used in a list of items (for example, a list of items prefaced by a phrase such as “at least one of” or “one or more of”) indicates an inclusive list such that, for example, a list of [at least one of A, B, or C] means A or B or C or AB or AC or BC or ABC (i.e., A and B and C).
As those of some skill in this art will by now appreciate and depending on the particular application at hand, many modifications, substitutions and variations can be made in and to the materials, apparatus, configurations and methods of use of the devices of the present disclosure without departing from the spirit and scope thereof. In light of this, the scope of the present disclosure should not be limited to that of the particular aspects illustrated and described herein, as they are merely by way of some examples thereof, but rather, should be fully commensurate with that of the claims appended hereafter and their functional equivalents.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202141020670 | May 2021 | IN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/US2021/051345 | 9/21/2021 | WO |
