Patent Application
20230324533
The present disclosure relates generally to joint configuration of cellular communications and bistatic object sensing, and more specifically to configuring bistatic sensing using sensing signals transmitted by one of a UE and a base station and received by the other of the UE and the base station.
To meet the demand for wireless data traffic having increased since deployment of 4G communication systems and to enable various vertical applications, 5G/NR communication systems have been developed and are currently being deployed. The 6G/5G/NR communication system is considered to be implemented in higher frequency (mmWave) bands, e.g., 28 giga-Hertz (GHz) or 60 GHz bands, so as to accomplish higher data rates or in lower frequency bands, such as 1-2 GHz, 3.5 GHz, or up to 6 GHz, to enable robust coverage and mobility support. To decrease propagation loss of the radio waves and increase the transmission distance, the beamforming, massive multiple-input multiple-output (MIMO), full dimensional MIMO (FD-MIMO), array antenna, an analog beam forming, large scale antenna techniques are discussed in 5G/NR communication systems.
In addition, in 5G/NR communication systems, development for system network improvement is under way based on advanced small cells, cloud radio access networks (RANs), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, moving network, cooperative communication, coordinated multi-points (CoMP), reception-end interference cancelation and the like.
The discussion of 5G and/or 6G systems and frequency bands associated therewith is for reference as certain embodiments of the present disclosure may be implemented in 5G systems. However, the present disclosure is not limited to 5G and/or 6G systems or the frequency bands associated therewith, and embodiments of the present disclosure may be utilized in connection with any frequency band. For example, aspects of the present disclosure may also be applied to deployment of 5G communication systems, as well as 6G or even later releases which may use terahertz (THz) bands.
Joint configuration of cellular communication and bistatic object sensing involves transmitting, to a UE, a bistatic object sensing configuration. The bistatic object sensing configuration configures the UE to one of receive a sensing signal transmitted by a base station or another UE, or transmit the sensing signal for reception by the base station or another UE. The bistatic object sensing configuration indicates sensing transmission power, waveform, and sensing resources and periodicity for the sensing signal, and may configure the UE to one of receive or transmit an object detection report.
In a first embodiment, a method performed by a user equipment (UE) for joint configuration of cellular communications and radar sensing includes receiving, from a base station, a configuration for performing bistatic object sensing by the UE using a sensing signal transmitted or received by one of the base station or another UE. The received bistatic object sensing configuration either configures the UE to transmit the sensing signal and indicates sensing signal waveform, sensing signal transmission power, sensing signal transmission resource, timing or periodicity for the sensing signal, whether directional beam sweeping is used, and whether any parameters are common for communications and object sensing, or configures the UE to receive the sensing signal and indicates include target sensing signal waveform, resource for receiving the sensing signal, timing for receiving the sensing signal, number of directional beams for reception of the sensing signal, and whether any parameters are common for communications and object sensing. The method also includes performing bistatic object sensing based on the received bistatic object sensing configuration.
In second embodiment, a user equipment (UE) configured for joint configuration of cellular communications and radar sensing includes a processor and a transceiver coupled to the processor. The transceiver is configured to receive, from a base station, a configuration for performing bistatic object sensing by the UE using a sensing signal transmitted or received by one of the base station or another UE. The received bistatic object sensing configuration either configures the UE to transmit the sensing signal and indicates sensing signal waveform, sensing signal transmission power, sensing signal transmission resource, timing or periodicity for the sensing signal, whether directional beam sweeping is used, and whether any parameters are common for communications and object sensing, or configures the UE to receive the sensing signal and indicates include target sensing signal waveform, resource for receiving the sensing signal, timing for receiving the sensing signal, number of directional beams for reception of the sensing signal, and whether any parameters are common for communications and object sensing. The UE is configured by the received bistatic object sensing configuration to perform bistatic object sensing.
In any of the preceding embodiments, the received bistatic object sensing configuration may configure the UE to transmit the sensing signal, in which case performing bistatic object sensing based on the received bistatic object sensing configuration comprises transmitting the sensing signal.
In any of the preceding embodiments, the received bistatic object sensing configuration may further indicate a destination of sensing reception reporting and a sensing reception reporting format, and the UE either receives an object detection report from the base station or another UE, or transmits an object detection report to the base station or another UE.
In the preceding embodiment, the sensing reception reporting format preferably includes at least one bit indicating whether a sensing signal correlator output or a sensing signal energy detector output exceeds a predetermined threshold.
In the preceding embodiment, the sensing reception reporting format preferably also includes an indication of whether a multipath profile is reported, If the multipath profile is reported, one or more of delay spread, number of tabs, tab gain, Doppler shift for the multipath profile, and whether multipath profile change is indicated. The sensing reception reporting format preferably also includes, if angle of arrival (AoA) information is configured, AoA of the received sensing signal and received sensing signal gain per different AoA. The sensing reception reporting format preferably also includes, if directional sensing is configured, at least one bit per beam. The sensing reception reporting format preferably also includes UE assistance information including the UE location, speed and trajectory.
In any of the preceding embodiments, the configuration for performing bistatic object sensing may be received as an indication of a set of allowed sensing configurations, and the UE may either transmit a sensing configuration request message for one of the allowed sensing configurations, or perform bistatic object sensing based on one of the allowed bistatic object sensing configurations.
In the preceding embodiment, UE assistance information for use in selection of the received bistatic object sensing configuration may be transmitted by the UE. The UE assistance information including sensing application type, UE location, UE mobility, and perceived channel environment.
In the preceding embodiment, the UE mobility may comprise an indication corresponding to one of pedestrian, vehicle or high-speed train, and the perceived channel environment may comprise one or more indication(s) of: urban macro cell (Uma), urban micro cell (Umi), indoor hotspot (InH), or rural; clutter/blockage presence, density, and/or severity; line of sight (LOS) or non-line of sight (NLOS); indoor or outdoor; in-car; or in-building.
In a third embodiment, a method performed by a base station (BS) includes transmitting, to a first user equipment (UE), a first configuration to transmit a sensing signal. The method also includes transmitting, to a second UE, a second configuration to receive a sensing signal. When the first configuration configures transmission of sensing object detection reports to the BS, the method further includes receiving, from at least one of the first UE or the second UE, a sensing report. The first configuration configures at least one of sensing signal waveform, transmission power, transmission resource, transmission timing, and directional beam sweeping. The second configuration configures at least one of target sensing signal waveform, resource, sensing signal timing, number of directional beams for reception, and reporting format.
In the third embodiment, the first configuration may configure the second UE to transmit the sensing report to at least one of the BS or the first UE.
In the third embodiment, the second configuration may configure the second UE to transmit the sensing report to and a sensing report format.
In the third embodiment, the sensing report may include: at least one bit indicating whether a sensing signal correlator output or a sensing signal energy detector output exceeds a predetermined threshold, an indication of whether a multipath profile is reported and, if the multipath profile is reported, one or more of delay spread, number of tabs, tab gain, Doppler shift for the multipath profile, and changes to multipath profile is indicated, when angle of arrival (AoA) information is configured, AoA of the received sensing signal and received sensing signal gain per different AoA, when directional sensing is configured, the at least one bit per beam, and UE assistance information including the UE location, speed and trajectory.
Other technical features may be readily apparent to one skilled in the art from the following figures, descriptions, and claims.
Before undertaking the DETAILED DESCRIPTION below, it may be advantageous to set forth definitions of certain words and phrases used throughout this patent document. The term “couple” and its derivatives refer to any direct or indirect communication between two or more elements, whether those elements are in physical contact with one another. The terms “transmit,” “receive,” and “communicate,” as well as derivatives thereof, encompass both direct and indirect communication. The terms “include” and “comprise,” as well as derivatives thereof, mean inclusion without limitation. The term “or” is inclusive, meaning and/or. The phrase “associated with,” as well as derivatives thereof, means to include, be included within, interconnect with, contain, be contained within, connect to or with, couple to or with, be communicable with, cooperate with, interleave, juxtapose, be proximate to, be bound to or with, have, have a property of, have a relationship to or with, or the like. The term “controller” means any device, system or part thereof that controls at least one operation. Such a controller may be implemented in hardware or a combination of hardware and software and/or firmware. The functionality associated with any particular controller may be centralized or distributed, whether locally or remotely. The phrase “at least one of,” when used with a list of items, means that different combinations of one or more of the listed items may be used, and only one item in the list may be needed. For example, “at least one of: A, B, and C” includes any of the following combinations: A, B, C, A and B, A and C, B and C, and A and B and C. Likewise, the term “set” means one or more. Accordingly, a set of items can be a single item or a collection of two or more items.
Moreover, various functions described below can be implemented or supported by one or more computer programs, each of which is formed from computer readable program code and embodied in a computer readable medium. The terms “application” and “program” refer to one or more computer programs, software components, sets of instructions, procedures, functions, objects, classes, instances, related data, or a portion thereof adapted for implementation in a suitable computer readable program code. The phrase “computer readable program code” includes any type of computer code, including source code, object code, and executable code. The phrase “computer readable medium” includes any type of medium capable of being accessed by a computer, such as read only memory (ROM), random access memory (RAM), a hard disk drive, a compact disc (CD), a digital video disc (DVD), or any other type of memory. A “non-transitory” computer readable medium excludes wired, wireless, optical, or other communication links that transport transitory electrical or other signals. A non-transitory computer readable medium includes media where data can be permanently stored and media where data can be stored and later overwritten, such as a rewritable optical disc or an erasable memory device.
Definitions for other certain words and phrases are provided throughout this patent document. Those of ordinary skill in the art should understand that in many if not most instances, such definitions apply to prior as well as future uses of such defined words and phrases.
For a more complete understanding of this disclosure and its advantages, reference is now made to the following description, taken in conjunction with the accompanying drawings, in which:
The figures included herein, and the various embodiments used to describe the principles of the present disclosure are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Further, those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged wireless communication system.
The above-identified references are incorporated herein by reference.
The present disclosure relates to beyond 5G or 6G communication system to be provided for supporting one or more of: higher data rates, lower latency, higher reliability, improved coverage, and massive connectivity, and so on. Various embodiments apply to UEs operating with other RATs and/or standards, such as different releases/generations of 3GPP standards (including beyond 5G, 6G, and so on), IEEE standards (such as 802.11/15/16), and so forth.
This disclosure pertains joint communication and radar sensing, wherein a UE is able to perform downlink/uplink/sidelink communication and also perform radar sensing by “sensing”/detecting environmental objects and their physical characteristics such as location/range, velocity/speed, elevation, angle, and so on. Radar sensing is achieved by sending a suitable sounding waveform and receiving and analyzing reflections or echoes of the sounding waveform. Such radar sensing operation can be used for applications such as proximity sensing, liveness detection, gesture control, face recognition, room/environment sensing, motion/presence detection, depth sensing, and so on, for various UE form factors. For some larger UE form factors, such as (driver-less) vehicles, trains, drones and so on, radar sensing can be additionally used for speed/cruise control, lane/elevation change, rear/blind spot view, parking assistance, and so on. Such radar sensing operation can be performed in various frequency bands, including millimeter wave (mmWave)/FR2 bands. In addition, with terra-Hertz (THz) spectrum, ultra-high resolution sensing, such as sub-cm level resolution, and sensitive Doppler detection, such as micro-Doppler detection, can be achieved with very large bandwidth allocation, for example, on the order of several giga-Hertz (GHz) or more.
Current implementations can support individual operation of communication and sensing, wherein the UE is equipped with separate modules, in terms of baseband processing units and/or RF chain and antenna arrays, for communication procedures and radar procedures. The separate communication and sensing architectures require repetitive implementation that increases UE complexity. In addition, since the two modules are designed separately, there is little/no coordination between the modules, so time/frequency/sequence/spatial resources are not efficiently used by the two modules, which in some cases can even lead to (self-)interference between the two modules of a same UE. In addition, the radar sensing operation of the UE can be based on pure implementation based methods and without any unified standards support, which can cause (significant) inter-UE issues, or may not be fully compatible with cellular systems. Furthermore, separate design of the two modules makes it difficult to use measurement or information acquired by one module to assist the other module. For example, the communication module may be unaware of a potential beam blockage due to a nearby object, although the sensing module may have already detected the object.
The bistatic sensing and the detailed embodiments described in this disclosure have various applications. In one example, the bistatic sensing can be applied for object sensing involving multiple vehicles and/or transmit-receive points (TRPs) where one or multiple vehicles or TRPs transmit sensing radar signal and another one or multiple vehicles or TRPs receive sensing radar signal and perform object detection. In another example, the bistatic sensing can be applied for home monitoring in which one or multiple UEs or TRPs in a residential space transmit periodic sensing radar signal and another one or multiple UEs and TRPs receive sensing radar signal. The receiving UEs or TRPs can perform various home monitoring functions such as intruder detection and sleep pattern monitoring by analyzing multipath signal propagation profile. Benefits of supporting sensing in communication systems, i.e., joint communication and sensing, include the reuse of existing communication devices and infrastructures as well as spectrum for sensing.
There is a need to develop a unified standard for support of joint communication and sensing to reduce the UE implementation complexity and enable coexistence of the two modules. There is another need to ensure time/frequency/sequence/spatial resources are efficiently used across communication and sensing modules of a same UE, as well as among different UEs performing these two operations, to reduce/avoid (self-)interference. There is a further need to design the two operations in such a way to provide assistance to each other by exchanging measurement results and acquired information, so that both procedures can operate more robustly and effectively.
The present disclosure provides designs for the support of joint communication and radar sensing. In particular, this disclosure is regarding a framework to support multi-device bistatic sensing in a network controlled manner in wireless communication systems.
Embodiments of the disclosure for supporting joint communication and radar sensing in wireless communication systems are summarized in the following and are fully elaborated further below.
As shown in
The gNB 102 provides wireless broadband access to the network 130 for a first plurality of user equipments (UEs) within a coverage area 120 of the gNB 102. The first plurality of UEs includes a UE 111, which may be located in a small business; a UE 112, which may be located in an enterprise; a UE 113, which may be a WiFi hotspot; a UE 114, which may be located in a first residence; a UE 115, which may be located in a second residence; and a UE 116, which may be a mobile device, such as a cell phone, a wireless laptop, a wireless PDA, or the like. The gNB 103 provides wireless broadband access to the network 130 for a second plurality of UEs within a coverage area 125 of the gNB 103. The second plurality of UEs includes the UE 115 and the UE 116. In some embodiments, one or more of the gNBs 101-103 may communicate with each other and with the UEs 111-116 using 5G/NR, long term evolution (LTE), long term evolution-advanced (LTE-A), WiMAX, WiFi, or other wireless communication techniques.
Depending on the network type, the term “base station” or “BS” can refer to any component (or collection of components) configured to provide wireless access to a network, such as transmit point (TP), transmit-receive point (TRP), an enhanced base station (eNodeB or eNB), a 5G/NR base station (gNB), a macrocell, a femtocell, a WiFi access point (AP), or other wirelessly enabled devices. Base stations may provide wireless access in accordance with one or more wireless communication protocols, e.g., 5G/NR 3rd generation partnership project (3GPP) NR, long term evolution (LTE), LTE advanced (LTE-A), high speed packet access (HSPA), Wi-Fi 802.11a/b/g/n/ac, etc. For the sake of convenience, the terms “BS” and “TRP” are used interchangeably in this patent document to refer to network infrastructure components that provide wireless access to remote terminals. Also, depending on the network type, the term “user equipment” or “UE” can refer to any component such as “mobile station,” “subscriber station,” “remote terminal,” “wireless terminal,” “receive point,” or “user device.” For the sake of convenience, the terms “user equipment” and “UE” are used in this patent document to refer to remote wireless equipment that wirelessly accesses a BS, whether the UE is a mobile device (such as a mobile telephone or smartphone) or is normally considered a stationary device (such as a desktop computer or vending machine).
Dotted lines show the approximate extents of the coverage areas 120 and 125, which are shown as approximately circular for the purposes of illustration and explanation only. It should be clearly understood that the coverage areas associated with gNBs, such as the coverage areas 120 and 125, may have other shapes, including irregular shapes, depending upon the configuration of the gNBs and variations in the radio environment associated with natural and man-made obstructions.
Although
As shown in
The transceivers 210a-210n receive, from the antennas 205a-205n, incoming RF signals, such as signals transmitted by UEs in the network 100. The transceivers 210a-210n down-convert the incoming RF signals to generate IF or baseband signals. The IF or baseband signals are processed by receive (RX) processing circuitry in the transceivers 210a-210n and/or controller/processor 225, which generates processed baseband signals by filtering, decoding, and/or digitizing the baseband or IF signals. The controller/processor 225 may further process the baseband signals.
Transmit (TX) processing circuitry in the transceivers 210a-210n and/or controller/processor 225 receives analog or digital data (such as voice data, web data, e-mail, or interactive video game data) from the controller/processor 225. The TX processing circuitry encodes, multiplexes, and/or digitizes the outgoing baseband data to generate processed baseband or IF signals. The transceivers 210a-210n up-converts the baseband or IF signals to RF signals that are transmitted via the antennas 205a-205n.
The controller/processor 225 can include one or more processors or other processing devices that control the overall operation of the gNB 102. For example, the controller/processor 225 could control the reception of UL channel signals and the transmission of DL channel signals by the transceivers 210a-210n in accordance with well-known principles. The controller/processor 225 could support additional functions as well, such as more advanced wireless communication functions. For instance, the controller/processor 225 could support beam forming or directional routing operations in which outgoing/incoming signals from/to multiple antennas 205a-205n are weighted differently to effectively steer the outgoing signals in a desired direction. Any of a wide variety of other functions could be supported in the gNB 102 by the controller/processor 225.
The controller/processor 225 is also capable of executing programs and other processes resident in the memory 230, such as an OS. The controller/processor 225 can move data into or out of the memory 230 as required by an executing process.
The controller/processor 225 is also coupled to the backhaul or network interface 235. The backhaul or network interface 235 allows the gNB 102 to communicate with other devices or systems over a backhaul connection or over a network. The interface 235 could support communications over any suitable wired or wireless connection(s). For example, when the gNB 102 is implemented as part of a cellular communication system (such as one supporting 5G/NR, LTE, or LTE-A), the interface 235 could allow the gNB 102 to communicate with other gNBs over a wired or wireless backhaul connection. When the gNB 102 is implemented as an access point, the interface 235 could allow the gNB 102 to communicate over a wired or wireless local area network or over a wired or wireless connection to a larger network (such as the Internet). The interface 235 includes any suitable structure supporting communications over a wired or wireless connection, such as an Ethernet or transceiver.
The memory 230 is coupled to the controller/processor 225. Part of the memory 230 could include a RAM, and another part of the memory 230 could include a Flash memory or other ROM.
Although
As shown in
The transceiver(s) 310 receives, from the antenna 305, an incoming RF signal transmitted by a gNB of the network 100. The transceiver(s) 310 down-converts the incoming RF signal to generate an intermediate frequency (IF) or baseband signal. The IF or baseband signal is processed by RX processing circuitry in the transceiver(s) 310 and/or processor 340, which generates a processed baseband signal by filtering, decoding, and/or digitizing the baseband or IF signal. The RX processing circuitry sends the processed baseband signal to the speaker 330 (such as for voice data) or is processed by the processor 340 (such as for web browsing data).
TX processing circuitry in the transceiver(s) 310 and/or processor 340 receives analog or digital voice data from the microphone 320 or other outgoing baseband data (such as web data, e-mail, or interactive video game data) from the processor 340. The TX processing circuitry encodes, multiplexes, and/or digitizes the outgoing baseband data to generate a processed baseband or IF signal. The transceiver(s) 310 up-converts the baseband or IF signal to an RF signal that is transmitted via the antenna(s) 305.
The processor 340 can include one or more processors or other processing devices and execute the OS 361 stored in the memory 360 in order to control the overall operation of the UE 116. For example, the processor 340 could control the reception of DL channel signals and the transmission of UL channel signals by the transceiver(s) 310 in accordance with well-known principles. In some embodiments, the processor 340 includes at least one microprocessor or microcontroller.
The processor 340 is also capable of executing other processes and programs resident in the memory 360. The processor 340 can move data into or out of the memory 360 as required by an executing process. In some embodiments, the processor 340 is configured to execute the applications 362 based on the OS 361 or in response to signals received from gNBs or an operator. The processor 340 is also coupled to the I/O interface 345, which provides the UE 116 with the ability to connect to other devices, such as laptop computers and handheld computers. The I/O interface 345 is the communication path between these accessories and the processor 340.
The processor 340 is also coupled to the input 350, which includes for example, a touchscreen, keypad, etc., and the display 355. The operator of the UE 116 can use the input 350 to enter data into the UE 116. The display 355 may be a liquid crystal display, light emitting diode display, or other display capable of rendering text and/or at least limited graphics, such as from web sites.
The memory 360 is coupled to the processor 340. Part of the memory 360 could include a random-access memory (RAM), and another part of the memory 360 could include a Flash memory or other read-only memory (ROM).
Although
Bistatic radar is suitable for continuous transmission of sensing waveform. Both transmission and reception processing modules can be placed within a device as shown in
The cellular baseband processing circuit 614 and the sensing baseband processing circuit 604 may be discrete modules communicating with each other, or may be (as depicted) logically separate but integrated into a single module. In this example, the transmission of sensing waveform and the reception of reflected sensing waveform can be concurrent while transmission/reception for communication are switched off, enabling bistatic radar operation. Also, concurrent transmission for communication and reception for sensing waveform are possible. In that case, the sensing could be monostatic (the UE both transmits and receives sensing waveforms) or bistatic (another UE or device transmits the sensing waveform). Concurrent reception for communication and reception for sensing are also possible. SIC may be applied to remove the interference from sensing signal for the reception of communication signal or vice versa.
In one embodiment, the UE can send its sensing capability to NW. TABLE 1 is an example list of possible information elements (IEs) for UE sensing capability indication to NW:
In one example, the UE can indicate the UE's baseband coordination capability between cellular and sensing modems. Possible indication of values could include {tight coordination, loose coordination, no coordination} as an example. Tight coordination may indicate that the cellular baseband has a full control over sensing baseband or sensing capability is implemented as a function of cellular baseband within an integrated chipset. With tight coordination, a UE can be signaled on parameters related to sensing transmission and/or reception via physical channels and procedures defined for communication system. Furthermore, the UE's communication function can control time/frequency resources and other parameters for sensing transmission and/or reception. The UE may also perform interference cancellation between communication and sensing. Loose coordination may indicate that the cellular baseband and sensing baseband can communication on related parameters but one does not have a control over the other. With loose coordination, a UE's communication function can receive information related to time/frequency resources and other parameters related to sensing transmission and/or reception from sensing function. The UE's communication and sensing functions can share information related to the severity of interference from each other and the time/frequency resources affected by the interference. However, the decision on the sensing transmission/reception and interference avoidance is up to sensing function and may not be instructed by communication function. No coordination may indicate that the two baseband functions cannot communicate with each other.
In another example, the UE can indicate the UE's sensing power class to the NW. As an example, the UE can indicate that the UE's sensing power class is the same with the UE's power class for communication or a specific power value, e.g., in decibel-milliwatts (dBm), to the NW, if different.
In yet another example, the UE can indicate the UE's supported sensing bandwidth, e.g., in mega-Hertz (MHz) or giga-Hertz (GHz), so that the NW does not configure a UE for sensing bandwidth exceeding the UE's capability. The UE can also indicate the list of bands that the UE supports for sensing operation. It can be indicated, for instance, in terms of NR band identifier (ID). The UE can also indicate whether in-band sensing can be supported, i.e., operation within a band configured for communication. If in-band sensing is not supported, then by default, the NW can assume that only out-of-band sensing can be supported by the UE.
In yet another example, the UE can indicate whether RF/antennas are shared or separate between cellular and sensing functions. The UE can also indicate whether RF/antennas are shared or separate between sensing transmission and reception. Based on this information, the NW can configure a correct mode of sensing operation, e.g., monostatic or bistatic, and resources for the UE.
In yet another example, the UE can indicate whether the UE has self-interference cancellation capability, e.g., cancellation of cellular transmission signal from sensing reception signal or cancellation of sensing transmission signal from cellular reception signal, etc. The UE can also indicate successive interference cancellation capability between a signal received for communication and a signal received for sensing. The UE can also indicate supported types of sensing waveforms as a part of UE capability indication.
In one embodiment, UE sends sensing configuration request message including sensing application type, range, and sensing periodicity, etc. Table. 2 is an example list of possible IEs for UE sensing configuration request message to NW:
In one example, the UE can indicate the UE's sensing application type, such as automotive, face/gesture recognition, etc., as the sensing resource configuration by NW may depend on the requested sensing application type. In another embodiment, the sensing application type may not be directly indicated to the NW but may be indirectly indicated via attributes of required sensing resource configuration.
In another example, the UE can indicate the desired range of sensing operation. As an example, long range sensing may be requested for automotive application or similarly short range sensing may be requested for face/gesture recognition application. The requested range values can be {short, mid, long} with predefined range values for each element. The requested range values can be in terms of meters. The configured sensing transmission power level by NW may depend on this indication.
In yet another example, the UE can indicate the desired periodicity of the sensing, i.e., continuous or periodic sensing with a certain interval. The configured time-domain sensing resource by NW may depend on this indication.
In yet another example, the UE can indicate the desired resolution of the sensing, i.e., fine granularity for sensing. The configured sensing bandwidth by NW may depend on this indication.
In yet another example, the UE can indicate whether directional sensing is requested. In this case, the UE can indicate the desired beamforming gain, 3 decibel (dB) beam width, and the number of beams for sweeping. The UE can obtain object sensing results towards certain directions which can enable various use cases requiring directional sensing information.
In yet another example, the UE can indicate time duration of sensing transmission signal and reception duration. In the case of bistatic sensing, the transmission and reception can be continuous. In the case of monostatic sensing, the transmission duration can be dependent on sensing application type and/or target sensing range, etc.
In another embodiment, the UE can indicate an index from a set of predefined sensing modes (e.g., TABLE 3 below). Each mode is associated with attributes that can support a certain use case including transmission power, bandwidth, range, periodicity, resolution, directional sensing, sensing duration, etc.
In one embodiment, the NW configures a UE with sensing resources and attributes and the UE performs sensing according to the configuration. TABLE 4 is an example list of possible IEs for NW sensing configuration message:
The IEs may include maximum transmission power for sensing waveform transmission, target reception power of the reflected sensing waveform for power control, sensing waveform and transmission periodicity, sensing duration, attributes for directional sensing including allowed number of beams and beam width, and sensing resource in time, frequency, and spatial domain, etc.
In the above-described embodiments, a UE first indicates the UE's sensing capability related information, followed by sensing resource configuration request and configuration by the NW for the UE to perform sensing functions. Alternatively, in another embodiment, the NW can broadcast a set of allowed sensing configurations. The broadcast information can include any combination of IEs disclosed in TABLES 1, 2, and 4 or by signaling a set of indices from a predefined configuration table as exemplified in TABLE 3. Such a broadcast message can be sent over MIB, SIB, or any cell-specific messages. The BS located in a different location can indicate different set of allowed sensing configurations. Upon receiving such broadcast message, the UE can send a sensing configuration request message to the NW within the set of allowed sensing configurations. Alternatively, in another embodiment, the UE can initiate sensing operations within the allowed set of configurations without further communicating with the NW for sending sensing request message and receiving the configuration message.
In one embodiment, the network controls multi-UE bistatic sensing in which a UE transmits sensing signal and another UE receives sensing signal.
The UE transmitting sensing signal(s) will be configured by the NW on the transmission related parameters including but not limited to those exemplified in TABLE 4. For instance, the transmitting UE will be configured with a sensing signal, including waveform and sequence, maximum transmission power and any power control related parameters, time/frequency resource for transmission, and beam sweeping related parameters (if directional sensing is configured). The UE receives these configurations through configuration mechanism supported in the communication system, e.g., higher layer signaling such as RRC messaging, and the set of parameters for sensing transmission and the set of parameters for communication can be different. If any parameters are common for sensing and communication, it can be indicated by network as well.
The UE receiving sensing signal will be configured by the NW on the reception related parameters including but not limited to those exemplified in TABLE 4. For instance, the receiving UE will be configured with the type of sensing signal, e.g., waveform/sequence etc., transmitted so that it can detect the signal. Also, in accordance with the time/frequency resource configured for the transmission, the receiving UE will be configured with the time/frequency resource for reception such that the UE can know of when and where to expect the reception. As the signal propagation will go through multiple different paths and will get delayed, a certain time instance/offset and a time window for reception can be configured to the UE. The time offset can be set to accommodate the propagation delay and the duration of the time window can be set to be sufficient to cover multi-path delay spread.
In one embodiment of bistatic sensing, the network configures a UE to transmit sensing signals and the network receives sensing signal and performs object detection.
In one embodiment of bistatic sensing, the network configures a UE to receive sensing signals and the network transmits sensing signal.
Once the sensing signal is received, an object detection can be performed, e.g., by using a signal correlator or an energy detector. In one embodiment, the report message can be a one-bit indication if the signal correlator output or energy detector output is below or above a certain threshold. This threshold is configured by the NW. In another embodiment, the report can include a plurality of such indications if there are multiple multipath signals below or above the threshold. In yet another embodiment, the report can include information regarding the multipath profile such as delay spread, number of tabs, tab gain, and Doppler shift. In yet another embodiment, the report can indicate changes in the multipath profile. In yet another embodiment, the report can include angle of arrival (AoA) of the received signal, received signal gain per different AoA. Alternatively, in one embodiment, the object detection report message can include the detected object(s) profile itself such as type of the object, e.g., truck/passenger vehicle/motorcycle for automotive sensing, distance from the receiver to the object, direction related information, etc. If directional sensing is configured and the sensing signal is transmitted to different directions per beam sweeping, all the above disclosed report can be made per beam basis, i.e., along with the beam index indication.
In one embodiment, the report message can also include assistance information such as the UE location, speed, moving trajectory, etc. This information can be useful if the UE is in motion. The UE transmitting sensing signal can also send this assistance information to the NW.
At step 2401, a UE sends assistance information to the serving cell for deciding sensing mode between monostatic and bistatic sensing. The assistance information provided by the UE may include sensing application type, the UE location, and/or perceived channel environment, urban macro cell (Uma)/urban micro cell (Umi)/indoor hotspot (InH)/rural, clutter/blockage presence/density/severity, line of sight (LOS)/non line of sight (NLOS) indication, indoor/outdoor indication, in-car indication, in-building indication, mobility in terms of velocity or categorization of speeds, e.g., pedestrian/vehicle/high-speed train, etc. At step 2402, the UE is provided by the serving cell the sensing mode and parameters related to sensing signal transmission or reception. The UE may be indicated by the serving cell to perform monostatic sensing or bistatic sensing based on the assistance information provided by the UE to the serving cell. If the network indicated the UE to perform bistatic sensing, the network also provides whether the UE will assume the role of transmitter or receiver and related transmission or reception parameters. The determination by the serving cell on whether a UE to take the role of transmitter or receiver may depend on various factors. One example is the required sensing range for the requested sensing application. If the required sensing range goes beyond the coverage that a UE can cover with its transmission power, the serving cell may transmit the sensing radar signal with higher transmission power and the UE takes the role of receiver. As another example, the network may decide a UE to perform sensing transmission or reception based on the remaining battery level. As another example, the network may decide a UE to perform sensing transmission or reception based on round robin manner. As another example, the network may decide a UE to receive sensing signal if the UE is the consumer of the sensing object detection outcome to avoid the overhead of sending the object detection report to the UE. At step 2403, the UE performs sensing signal transmission or sensing signal reception according to the sensing mode and parameters received from the serving cell.
The present disclosure provides designs for the support of joint communication and radar sensing. In particular, this disclosure relates to a framework to support multi-device bistatic sensing in wireless communication systems.
Embodiments of the disclosure for supporting joint communication and radar sensing in wireless communication systems may be summarized as follows:
In one embodiment, UEs can be paired in a distributed manner via D2D communication for bistatic sensing without intervention from the network.
In one embodiment, UEs can be paired in a distributed manner via D2D communication for bistatic sensing without intervention from the network.
For illustrative purposes the steps of algorithms above are described serially. However, some of these steps may be performed in parallel to each other. The operation diagrams illustrate example methods that can be implemented in accordance with the principles of the present disclosure and various changes could be made to the methods illustrated in the flowcharts. For example, while shown as a series of steps, various steps in each figure could overlap, occur in parallel, occur in a different order, or occur multiple times. In another example, steps may be omitted or replaced by other steps.
Although this disclosure has been described with an exemplary embodiment, various changes and modifications may be suggested to one skilled in the art. It is intended that this disclosure encompass such changes and modifications as fall within the scope of the appended claims.
This application claims priority under 35 U.S.C. § 119(e) to U.S. Provisional Patent Application No. 63/329,699 filed Apr. 11, 2022, U.S. Provisional Patent Application No. 63/331,508 filed Apr. 15, 2022, and U.S. Provisional Patent Application No. 63/391,590 filed Jul. 22, 2022. The content of the above-identified patent document(s) is incorporated herein by reference.
| Number | Date | Country | |
|---|---|---|---|
| 63329699 | Apr 2022 | US | |
| 63331508 | Apr 2022 | US | |
| 63391590 | Jul 2022 | US |
