Patent Application
20240357393
The present disclosure generally relates to communication systems, and more particularly, to a wireless communication system between a user equipment (UE) and a base station.
Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.
These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level. An example telecommunication standard is 5G New Radio (NR). 5G NR is part of a continuous mobile broadband evolution promulgated by Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with Internet of Things (IoT)), and other requirements. 5G NR includes services associated with enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra-reliable low latency communications (URLLC). Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard. There exists a need for further improvements in 5G NR technology. These improvements may also be applicable to other multi-access technologies and the telecommunication standards that employ these technologies.
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE obtains a channel state information (CSI) report configuration from a base station, where the CSI report configuration includes one or more measurement resource sets supporting deactivation of base station antenna ports. The UE sends a CSI report to the base station in response to a CSI measurement in the one or more measurement resource sets.
In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a base station. The base station sends a CSI report configuration to a UE, where the CSI report configuration includes one or more measurement resource sets supporting deactivation of base station antenna ports. The base station obtains a CSI report from the UE in response to a CSI measurement in the one or more measurement resource sets.
To the accomplishment of the foregoing and related ends, the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents.
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 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 instances, well known structures and components are shown in block diagram form in order to avoid obscuring such concepts.
In recent years following the advent of 5G/NR technology, a growing concern has arisen regarding the amount of power consumed by cellular networks. For example, 5G massive MIMO (mMIMO) technology, which enables an increase in data throughput compared to LTE MIMO technology (e.g., based on a larger number of antennas for transmission (Tx) or reception (Rx) and other factors), results in significantly higher power consumption than its earlier counterpart. Moreover, growing environmental factors such as carbon emissions also contribute to an increase in power consumed. As a result, the power consumption of cellular networks may significantly affect network operator expenditures (OPEX).
To help reduce the power consumption and associated OPEX, efforts by the network have been taken to achieve network energy savings. For example, networks have employed dynamic base station antenna adaptation, in which base stations (e.g., single transmission/reception points (sTRPs)) supporting mMIMO technology with multiple co-located antenna panels (or sub-panels) may power off one or more of these panels or sub-panels in order to reduce energy expenditure. For instance, when the base station is operating in a power saving mode in which the base station applies dynamic antenna port adaptation, the base station may deactivate a number of its panels or sub-panels in order to fallback to a half duplex mode from a full duplex mode, or to reduce power consumption during times of low traffic or cell activity (e.g., low loading scenarios). However, such efforts typically lack UE interaction or involvement; for example, UEs may not be configured to provide CSI reports indicating to the base station which panel(s) or sub-panel(s) may be deactivated. Therefore, it would be helpful to optimize network power consumption and energy efficiency by involving the UE in such efforts (e.g., in dynamic base station antenna adaptation).
Generally, a base station provides a CSI report configuration to the UE configuring one resource set including non-zero power (NZP) channel measurement resources (CMR). The base station may select the NZP CMR resource set based at least on the number of its currently active antenna ports, and the base station may transmit CSI reference signals (CSI-RS) in each resource of the resource set for the UE to perform CSI measurements. However, if the base station performs dynamic antenna port adaptation in which the base station deactivates one or more of its antenna panels (or sub-panels) to reduce energy expenditure in a power savings mode, the number of active antennas available for transmitting CSI-RS may similarly reduce and the previously selected NZP CMR resource set in the CSI report configuration may no longer apply. Although the base station may provide a new CSI report configuration with a new NZP CMR resource set applicable for the reduced number of antennas, such approach may be inefficient if the base station has to provide a new CSI report configuration every time it deactivates or re-activates one or more of its antenna panels or sub-panels. It would therefore be helpful to provide options for configuring NZP CSI-RS resources for channel measurement (or, similarly, other resources for interference measurement) in view of dynamic antenna port adaptation.
To these ends, aspects of the present disclosure allow the base station to provide CSI report configurations which account for a power savings mode of the base station. While the base station is operating in the power savings mode, the base station may deactivate one or more of its antenna panels or sub-panels to reduce energy expenditure. To account for this antenna port deactivation, the base station may configure one or more resource sets in the CSI report configuration including resources associated with the power savings mode (referred to here as “power saving resources”) and resources not associated with the power savings mode (referred to here as “non-power saving resources”). Here, power saving resources refer to resources in which the base station may transmit CSI-RS from active (not deactivated) antenna ports while operating in the power savings mode, and non-power saving resources refer to resources in which the base station may transmit CSI-RS from its antenna ports while not operating in the power savings mode. The resources may be channel measurement resources of one or more channel measurement resource sets, or interference measurement resources of one or more interference measurement resource sets. The base station may dynamically indicate whether the base station is transmitting CSI-RS in power saving resources or non-power saving resources, and the UE may measure CSI in the indicated resources accordingly for CSI reporting. Such approach allows the base station to efficiently configure CSI reporting for dynamic antenna port adaptation through a single CSI report configuration, rather than inefficiently through multiple CSI report configurations to support dynamic antenna port adaptation (or different dynamic antenna port adaptations). Alternatively, the UE may measure CSI in power saving resources and non-power saving resources for CSI reporting, and the base station may determine from the CSI report which antenna ports (e.g., panels or sub-panels) to deactivate. Such approach allows the UE to become involved in the dynamic antenna port adaptation process (e.g., which antenna ports the base station may deactivate) and thus promotes UE involvement in network energy saving efforts. Moreover, after the base station determines which antenna ports to deactivate from the CSI report, the base station may provide dynamic indications of resources as previously described. In this way, UE involvement in network energy savings with efficient CSI report configurations may be achieved.
Several aspects of telecommunication systems will now be presented with reference to various apparatus and methods. These apparatus and methods will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as “elements”). These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.
By way of example, an element, or any portion of an element, or any combination of elements may be implemented as a “processing system” that includes one or more processors. Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, systems on a chip (SoC), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure. One or more processors in the processing system may execute software. Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
Accordingly, in one or more example embodiments, the functions described may be implemented in hardware, software, or any combination thereof. If implemented in software, the functions may be stored on or encoded as one or more instructions or code on a computer-readable medium. Computer-readable media includes computer storage media. Storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise a random-access memory (RAM), a read-only memory (ROM), an electrically erasable programmable ROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of the aforementioned types of computer-readable media, or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.
The base stations 102 configured for 4G Long Term Evolution (LTE) (collectively referred to as Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) may interface with the EPC 160 through first backhaul links 132 (e.g., SI interface). The base stations 102 configured for 5G New Radio (NR) (collectively referred to as Next Generation RAN (NG-RAN)) may interface with core network 190 through second backhaul links 184. In addition to other functions, the base stations 102 may perform one or more of the following functions: transfer of user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection setup and release, load balancing, distribution for non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, Multimedia Broadcast Multicast Service (MBMS), subscriber and equipment trace, RAN information management (RIM), paging, positioning, and delivery of warning messages. The base stations 102 may communicate directly or indirectly (e.g., through the EPC 160 or core network 190) with each other over third backhaul links 134 (e.g., X2 interface). The first backhaul links 132, the second backhaul links 184, and the third backhaul links 134 may be wired or wireless.
The base stations 102 may wirelessly communicate with the UEs 104. Each of the base stations 102 may provide communication coverage for a respective geographic coverage area 110. There may be overlapping geographic coverage areas 110. For example, the small cell 102′ may have a coverage area 110′ that overlaps the coverage area 110 of one or more macro base stations 102. A network that includes both small cell and macrocells may be known as a heterogeneous network. A heterogeneous network may also include Home Evolved Node Bs (eNBs) (HeNBs), which may provide service to a restricted group known as a closed subscriber group (CSG). The communication links 120 between the base stations 102 and the UEs 104 may include uplink (UL) (also referred to as reverse link) transmissions from a UE 104 to a base station 102 and/or downlink (DL) (also referred to as forward link) transmissions from a base station 102 to a UE 104. The communication links 120 may use multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and/or transmit diversity. The communication links may be through one or more carriers. The base stations 102/UEs 104 may use spectrum up to Y megahertz (MHz) (e.g., 5, 10, 15, 20, 100, 400, etc. MHz) bandwidth per carrier allocated in a carrier aggregation of up to a total of Yx MHZ (x component carriers) used for transmission in each direction. The carriers may or may not be adjacent to each other. Allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated for DL than for UL). The component carriers may include a primary component carrier and one or more secondary component carriers. A primary component carrier may be referred to as a primary cell (PCell) and a secondary component carrier may be referred to as a secondary cell (SCell).
Certain UEs 104 may communicate with each other using device-to-device (D2D) communication link 158. The D2D communication link 158 may use the DL/UL WWAN spectrum. The D2D communication link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), and a physical sidelink control channel (PSCCH). D2D communication may be through a variety of wireless D2D communications systems, such as for example, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, LTE, or NR.
The wireless communications system may further include a Wi-Fi access point (AP) 150 in communication with Wi-Fi stations (STAs) 152 via communication links 154, e.g., in a 5 gigahertz (GHz) unlicensed frequency spectrum or the like. When communicating in an unlicensed frequency spectrum, the STAs 152/AP 150 may perform a clear channel assessment (CCA) prior to communicating in order to determine whether the channel is available.
The small cell 102′ may operate in a licensed and/or an unlicensed frequency spectrum. When operating in an unlicensed frequency spectrum, the small cell 102′ may employ NR and use the same unlicensed frequency spectrum (e.g., 5 GHZ, or the like) as used by the Wi-Fi AP 150. The small cell 102′, employing NR in an unlicensed frequency spectrum, may boost coverage to and/or increase capacity of the access network.
The electromagnetic spectrum is often subdivided, based on frequency/wavelength, into various classes, bands, channels, etc. In 5G NR, two initial operating bands have been identified as frequency range designations FR1 (410 MHz-7.125 GHZ) and FR2 (24.25 GHz-52.6 GHZ). The frequencies between FR1 and FR2 are often referred to as mid-band frequencies. Although a portion of FR1 is greater than 6 GHZ, FR1 is often referred to (interchangeably) as a “sub-6 GHz” band in various documents and articles. A similar nomenclature issue sometimes occurs with regard to FR2, which is often referred to (interchangeably) as a “millimeter wave” band in documents and articles, despite being different from the extremely high frequency (EHF) band (30 GHz-300 GHz) which is identified by the International Telecommunications Union (ITU) as a “millimeter wave” band.
With the above aspects in mind, unless specifically stated otherwise, it should be understood that the term “sub-6 GHz” or the like if used herein may broadly represent frequencies that may be less than 6 GHZ, may be within FR1, or may include mid-band frequencies. Further, unless specifically stated otherwise, it should be understood that the term “millimeter wave” or the like if used herein may broadly represent frequencies that may include mid-band frequencies, may be within FR2, or may be within the EHF band.
A base station 102, whether a small cell 102′ or a large cell (e.g., macro base station), may include and/or be referred to as an eNB, gNodeB (gNB), or another type of base station. Some base stations, such as gNB 180 may operate in a traditional sub 6 GHz spectrum, in millimeter wave frequencies, and/or near millimeter wave frequencies in communication with the UE 104. When the gNB 180 operates in millimeter wave or near millimeter wave frequencies, the gNB 180 may be referred to as a millimeter wave base station. The millimeter wave base station 180 may utilize beamforming 182 with the UE 104 to compensate for the path loss and short range. The base station 180 and the UE 104 may each include a plurality of antennas, such as antenna elements, antenna panels, and/or antenna arrays to facilitate the beamforming.
The base station 180 may transmit a beamformed signal to the UE 104 in one or more transmit directions 182′. The UE 104 may receive the beamformed signal from the base station 180 in one or more receive directions 182″. The UE 104 may also transmit a beamformed signal to the base station 180 in one or more transmit directions. The base station 180 may receive the beamformed signal from the UE 104 in one or more receive directions. The base station 180/UE 104 may perform beam training to determine the best receive and transmit directions for each of the base station 180/UE 104. The transmit and receive directions for the base station 180 may or may not be the same. The transmit and receive directions for the UE 104 may or may not be the same.
The EPC 160 may include a Mobility Management Entity (MME) 162, other MMEs 164, a Serving Gateway 166, an MBMS Gateway 168, a Broadcast Multicast Service Center (BM-SC) 170, and a Packet Data Network (PDN) Gateway 172. The MME 162 may be in communication with a Home Subscriber Server (HSS) 174. The MME 162 is the control node that processes the signaling between the UEs 104 and the EPC 160. Generally, the MME 162 provides bearer and connection management. All user Internet protocol (IP) packets are transferred through the Serving Gateway 166, which itself is connected to the PDN Gateway 172. The PDN Gateway 172 provides UE IP address allocation as well as other functions. The PDN Gateway 172 and the BM-SC 170 are connected to the IP Services 176. The IP Services 176 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS), a PS Streaming Service, and/or other IP services. The BM-SC 170 may provide functions for MBMS user service provisioning and delivery. The BM-SC 170 may serve as an entry point for content provider MBMS transmission, may be used to authorize and initiate MBMS Bearer Services within a public land mobile network (PLMN), and may be used to schedule MBMS transmissions. The MBMS Gateway 168 may be used to distribute MBMS traffic to the base stations 102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area broadcasting a particular service, and may be responsible for session management (start/stop) and for collecting eMBMS related charging information.
The core network 190 may include a Access and Mobility Management Function (AMF) 192, other AMFs 193, a Session Management Function (SMF) 194, and a User Plane Function (UPF) 195. The AMF 192 may be in communication with a Unified Data Management (UDM) 196. The AMF 192 is the control node that processes the signaling between the UEs 104 and the core network 190. Generally, the AMF 192 provides Quality of Service (QOS) flow and session management. All user IP packets are transferred through the UPF 195. The UPF 195 provides UE IP address allocation as well as other functions. The UPF 195 is connected to the IP Services 197. The IP Services 197 may include the Internet, an intranet, an IMS, a Packet Switch (PS) Streaming Service, and/or other IP services.
The base station may include and/or be referred to as a gNB, Node B, eNB, an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), a transmit reception point (TRP), or some other suitable terminology. The base station 102 provides an access point to the EPC 160 or core network 190 for a UE 104. Examples of UEs 104 include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player), a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor/actuator, a display, or any other similar functioning device. Some of the UEs 104 may be referred to as IoT devices (e.g., parking meter, gas pump, toaster, vehicles, heart monitor, etc.). The UE 104 may also be referred to as a station, a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.
Although the present disclosure may focus on 5G NR, the concepts and various aspects described herein may be applicable to other similar areas, such as LTE, LTE-Advanced (LTE-A), Code Division Multiple Access (CDMA), Global System for Mobile communications (GSM), or other wireless/radio access technologies.
Referring again to
Referring again to
Other wireless communication technologies may have a different frame structure and/or different channels. A frame, e.g., of 10 milliseconds (ms), may be divided into 10 equally sized subframes (1 ms). Each subframe may include one or more time slots. Subframes may also include mini-slots, which may include 7, 4, or 2 symbols. Each slot may include 7 or 14 symbols, depending on the slot configuration. For slot configuration 0, each slot may include 14 symbols, and for slot configuration 1, each slot may include 7 symbols. The symbols on DL may be cyclic prefix (CP) orthogonal frequency-division multiplexing (OFDM) (CP-OFDM) symbols. The symbols on UL may be CP-OFDM symbols (for high throughput scenarios) or discrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) symbols (also referred to as single carrier frequency-division multiple access (SC-FDMA) symbols) (for power limited scenarios; limited to a single stream transmission). The number of slots within a subframe is based on the slot configuration and the numerology. For slot configuration 0, different numerologies μ 0 to 4 allow for 1, 2, 4, 8, and 16 slots, respectively, per subframe. For slot configuration 1, different numerologies 0 to 2 allow for 2, 4, and 8 slots, respectively, per subframe. Accordingly, for slot configuration 0 and numerology μ, there are 14 symbols/slot and 2μ slots/subframe. The subcarrier spacing and symbol length/duration are a function of the numerology. The subcarrier spacing may be equal to 2μ*15 kilohertz (kHz), where μ is the numerology 0 to 4. As such, the numerology μ=0 has a subcarrier spacing of 15 kHz and the numerology μ=4 has a subcarrier spacing of 240 kHz. The symbol length/duration is inversely related to the subcarrier spacing.
A resource grid may be used to represent the frame structure. Each time slot includes a resource block (RB) (also referred to as physical RBs (PRBs)) that extends 12 consecutive subcarriers. The resource grid is divided into multiple resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.
As illustrated in
As illustrated in
The transmit (TX) processor 316 and the receive (RX) processor 370 implement layer 1 functionality associated with various signal processing functions. Layer 1, which includes a physical (PHY) layer, may include error detection on the transport channels, forward error correction (FEC) coding/decoding of the transport channels, interleaving, rate matching, mapping onto physical channels, modulation/demodulation of physical channels, and MIMO antenna processing. The TX processor 316 handles mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK), quadrature phase-shift keying (QPSK), M-phase-shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The coded and modulated symbols may then be split into parallel streams. Each stream may then be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and/or frequency domain, and then combined together using an Inverse Fast Fourier Transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream. The OFDM stream is spatially precoded to produce multiple spatial streams. Channel estimates from a channel estimator 374 may be used to determine the coding and modulation scheme, as well as for spatial processing. The channel estimate may be derived from a reference signal and/or channel condition feedback transmitted by the UE 350. Each spatial stream may then be provided to a different antenna 320 via a separate transmitter 318TX. Each transmitter 318TX may modulate an RF carrier with a respective spatial stream for transmission.
At the UE 350, each receiver 354RX receives a signal through its respective antenna 352. Each receiver 354RX recovers information modulated onto an RF carrier and provides the information to the receive (RX) processor 356. The TX processor 368 and the RX processor 356 implement layer 1 functionality associated with various signal processing functions. The RX processor 356 may perform spatial processing on the information to recover any spatial streams destined for the UE 350. If multiple spatial streams are destined for the UE 350, they may be combined by the RX processor 356 into a single OFDM symbol stream. The RX processor 356 then converts the OFDM symbol stream from the time-domain to the frequency domain using a Fast Fourier Transform (FFT). The frequency domain signal comprises a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols on each subcarrier, and the reference signal, are recovered and demodulated by determining the most likely signal constellation points transmitted by the base station 310. These soft decisions may be based on channel estimates computed by the channel estimator 358. The soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by the base station 310 on the physical channel. The data and control signals are then provided to the controller/processor 359, which implements layer 3 and layer 2 functionality.
The controller/processor 359 can be associated with a memory 360 that stores program codes and data. The memory 360 may be referred to as a computer-readable medium. In the UL, the controller/processor 359 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets from the EPC 160. The controller/processor 359 is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations.
Similar to the functionality described in connection with the DL transmission by the base station 310, the controller/processor 359 provides RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting; PDCP layer functionality associated with header compression/decompression, and security (ciphering, deciphering, integrity protection, integrity verification); RLC layer functionality associated with the transfer of upper layer PDUs, error correction through ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.
Channel estimates derived by a channel estimator 358 from a reference signal or feedback transmitted by the base station 310 may be used by the TX processor 368 to select the appropriate coding and modulation schemes, and to facilitate spatial processing. The spatial streams generated by the TX processor 368 may be provided to different antenna 352 via separate transmitters 354TX. Each transmitter 354TX may modulate an RF carrier with a respective spatial stream for transmission.
The UL transmission is processed at the base station 310 in a manner similar to that described in connection with the receiver function at the UE 350. Each receiver 318RX receives a signal through its respective antenna 320. Each receiver 318RX recovers information modulated onto an RF carrier and provides the information to a RX processor 370.
The controller/processor 375 can be associated with a memory 376 that stores program codes and data. The memory 376 may be referred to as a computer-readable medium. In the UL, the controller/processor 375 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover IP packets from the UE 350. IP packets from the controller/processor 375 may be provided to the EPC 160. The controller/processor 375 is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations.
At least one of the TX processor 368, the RX processor 356, and the controller/processor 359 may be configured to perform aspects in connection with power savings CSI report component 198 of
At least one of the TX processor 316, the RX processor 370, and the controller/processor 375 may be configured to perform aspects in connection with power savings CSI report configuration component 199 of
In recent years following the advent of 5G/NR technology, a growing concern has arisen regarding the amount of power consumed by cellular networks. For example, 5G mMIMO technology, which enables an increase in data throughput compared to LTE MIMO technology (e.g., based on a larger number of antennas for Tx or Rx and other factors), results in significantly higher power consumption than its earlier counterpart. Moreover, growing environmental factors such as carbon emissions also contribute to an increase in power consumed. As a result, the power consumption of cellular networks may significantly affect network OPEX.
Thus, as illustrated in the example chart 400, network power consumption for 5G/NR deployments may be significantly greater than network power consumption for 4G/LTE deployments. As shown in
To help reduce the power consumption and associated OPEX, efforts by the network have been taken to achieve network energy savings. For example, networks have employed dynamic base station antenna adaptation, in which base stations (e.g., single TRPs) supporting mMIMO technology with multiple co-located antenna panels (or sub-panels) may power off one or more of these panels or sub-panels in order to reduce energy expenditure. For instance, when the base station is operating in a power saving mode in which the base station applies dynamic antenna port adaptation, the base station may deactivate a number of its panels or sub-panels in order to fallback to a half duplex mode from a full duplex mode, or to reduce power consumption during times of low traffic or cell activity (e.g., low loading scenarios). However, such efforts typically lack UE interaction or involvement; for example, UEs may not be configured to provide CSI reports indicating to the base station which panel(s) or sub-panel(s) may be deactivated. Therefore, it would be helpful to optimize network power consumption and energy efficiency by involving the UE in such efforts (e.g., in dynamic base station antenna adaptation).
The base station may also generate and transmit one or more CSI-RS (e.g., using antennas 506 in active panels of
Moreover, each resource setting may be associated with (e.g. include an index or other link to) a single CSI-RS resource set selected by the base station from one of multiple resource sets. For instance, in the example of
Furthermore, each CSI-RS resource set in a CSI report configuration may include one or more CSI-RS resources in which the UE may measure CSI for subsequent CSI reporting. For example, referring to
Additionally, each of the N CMR resources, M CSI-IM resources, and S NZP IMR resources may include resources associated with different transmission configuration indicator (TCI) states (e.g., for different TRPs), and the UE may select the resources associated with a given TCI state for each TRP. For instance, in the example of
When the UE provides a CSI report to the base station including measured CSI from a selected resource (e.g., a selected resource in a NZP CMR resource set, a CSI-IM resource set, and/or a NZP IMR resource set), the UE may include a CSI-RS resource indicator (CRI) associated with the selected resource(s) in the CSI report. The CRI may indicate to the base station which selected resource(s) corresponds to the reported CSI. For instance, after measuring CSI in all N resources of configured NZP CMR resource set n, the UE may determine that NZP CMR resource n1 616 is associated with the highest SINR of the measured NZP CMR resources, and the UE may report the CRI associated with NZP CMR resource n1 616 in the CSI report. Similarly, after measuring CSI in all M and/or S resources of configured CSI-IM resource set m and/or NZP IMR resource set s, the UE may determine that CSI-IM resource m1 618 is associated with the highest SINR of the measured CSI-IM resources and that NZP IMR resource s1 620 is associated with the highest SINR of the measured NZP IMR resources, and the UE may report the CRI(s) associated with the CSI-IM resource me 618 and/or NZP IMR resource s1 620 in the CSI report.
One example of CSI which the UE may measure and report in a selected NZP CMR resource (e.g., NZP CMR resource n1 or NZP CMR resource n2 in the example of
Additionally, all resources in a resource set may be associated with a same number of transmission antenna ports. For example, each of the N resources in NZP CMR resource set n 610 (including NZP CMR resource n1 616 and NZP CMR resource n2 622) may be associated with 32 CSI-RS antenna ports according to Table 2 above (Type 1 multiple panel PMI codebook). Similarly, each of the N resources in NZP CMR resource set n−1 may be associated with a same number of CSI-RS antenna ports (e.g., 8, 16, or 32 according to Table 2), each of the N resources in NZP CMR resource set n+1 may be associated with a same number of CSI-RS antenna ports (e.g., 8, 16, or 32 according to Table 2), and so forth for each NZP CMR resource set.
Generally, a base station provides a CSI report configuration to the UE configuring one NZP CMR resource set (e.g., NZP CMR resource set n 610 in the example of
However, if the base station performs dynamic antenna port adaptation in which the base station deactivates one or more of its antenna panels (or sub-panels) to reduce energy expenditure in a power savings mode, the number of active antennas available for transmitting CSI-RS may similarly reduce. For example, if the base station (e.g., TRP 502) deactivates three of its antenna panels 504 in response to dynamic antenna port adaption such as illustrated in
Aspects of the present disclosure allow the base station to provide CSI report configurations which account for a power savings mode of the base station. While the base station is operating in the power savings mode, the base station may deactivate one or more of its antenna panels or sub-panels to reduce energy expenditure. For example, while operating in the power savings mode, the base station may deactivate a number of its antenna panels 504 or sub-panels to reduce power consumption through dynamic antenna port adaptation (e.g., during low loading scenarios), such as described above with respect to
In one example, the base station may dynamically indicate (e.g., via a MAC-CE or DCI) whether the base station is transmitting CSI-RS in power saving resources or non-power saving resources, and the UE may measure CSI in the indicated resources accordingly for CSI reporting. Such approach allows the base station to efficiently configure CSI reporting for dynamic antenna port adaptation through a single CSI report configuration, rather than inefficiently through multiple CSI report configurations to support dynamic antenna port adaptation (or different dynamic antenna port adaptations). In another example, the UE may measure CSI in power saving resources and non-power saving resources for CSI reporting, and the base station may determine from the CSI report which antenna ports (e.g., panels or sub-panels) to deactivate. Such approach allows the UE to become involved in the dynamic antenna port adaptation process (e.g., which antenna ports the base station may deactivate) and thus promotes UE involvement in network energy saving efforts. In a further example, the previous two examples may be combined. For instance, after the base station determines which antenna ports to deactivate from the CSI report as in the aforementioned second example, the base station may provide dynamic indications of resources as in the aforementioned first example. In this way, UE involvement in network energy savings with efficient CSI report configurations may be achieved.
The following description of various aspects of the present disclosure illustrate and refer specifically to NZP CMR resource sets, NZP CMR resources, non-power saving CMR resources, and power saving CMR resources. These illustrations and descriptions are not intended to be limiting and are intended to refer to one example of resources, namely resources for channel measurement. However, it should be understood that the aspects of the present disclosure are not limited to channel measurement resources and may alternatively, or additionally, refer to interference measurement resources. For example, any reference in the drawings and subsequent paragraphs to NZP CMR resource sets, NZP CMR resources, non-power saving CMR resources, and power saving CMR resources may be replaced respectively with CSI-IM resource sets, CSI-IM resources, non-power saving CSI-IM resources, and power saving CSI-IM resources, in one example. Alternatively or additionally, such references may be replaced respectively with NZP IMR resource sets, NZP IMR resources, non-power saving NZP IMR resources, and power saving NZP IMR resources, in another example.
Each resource subset 710, 712 may also be associated with an index 714, and the base station may dynamically indicate the index (or indices) of one or more resource subsets in which the UE may perform CMR measurements. For instance, the base station may provide a MAC-CE or DCI indicating the index 714 of one or more resource subsets 712 containing power saving CMR resources 708, or the index 714 of the resource subset 710 containing non-power saving CMR resources 706, and the UE may measure CSI in the resources 706, 708 of the indicated resource subset(s) in response to the MAC-CE or DCI. The UE may then include in the CSI report (or in multiple CSI reports) a CRI 716 associated with the best resource in the indicated resource subset(s). For instance, in the example of
In one example, if the base station dynamically indicates one resource subset 712 in MAC-CE or DCI (e.g., resource subset a, b or c), the UE may report one CRI 716 in a CSI report. In another example, if the base station dynamically indicates multiple resource subsets 712 (e.g., resource subsets b and c), the UE may report multiple CRIs 716 in one CSI report or one CRI 716 in multiple CSI reports. In such case where the base station receives multiple CRIs in one or more CSI reports (one for each indicated resource subset), the base station may determine the resource subset corresponding to each received CRI based on the CRI itself and the order of resources in each resource subset. Alternatively, in another aspect of the present disclosure, the UE may include in the CSI report(s) the index 714 of the resource subset 712 associated with each CRI 716. For instance, if the base station configures the UE to measure resources in multiple resource subsets (e.g., resource subsets b and c), the base station may determine the resource subset corresponding to each received CRI (e.g., resource subset b or c) based on the index of the resource subset included in the CSI report.
In one example, each NZP CMR resource set 804 may be associated with an index 816, and the base station may dynamically indicate the index (or indices) of the NZP CMR resource set in which the UE may perform CMR measurements. For instance, the base station may provide a MAC-CE or DCI indicating the index 816 of the non-power saving CMR resource set 810 containing non-power saving CMR resources 806, or the index 816 of the power saving CMR resource set 812 containing power saving CMR resources 808, and the UE may measure CSI in the resources 806, 808 of the indicated resource set in response to indicated index in the MAC-CE or DCI. Until the base station provides the MAC-CE or DCI indicating the index 816 of the resource set for CSI measurement, the UE may measure the non-power saving CMR resources 806 in the non-power saving CMR resource set 810 by default. Moreover, if multiple resource subsets 814 of power saving CMR resource set 812 are configured, each resource subset may also be associated with an index 818, and the base station may further dynamically indicate the index (or indices) of one or more resource subsets in which the UE may perform CMR measurements in the power saving CMR resources 808. For instance, if the base station provides a MAC-CE or DCI indicating the index 816 of power saving CMR resource set 812, the base station may also indicate in the same or different MAC-CE or DCI the index 818 of one or more resource subsets 814 containing power saving CMR resources 808, and the UE may measure CSI in the resources 808 of the indicated resource subset(s) in response to the MAC-CE or DCI. The UE may then include in the CSI report (or in multiple CSI reports) a CRI 820 associated with the best resource in the indicated resource set or subset(s). For instance, in the example of
In the above example, the base station has deactivated one or more of its antenna panels or sub-panels in the power savings mode, and thus may dynamically indicate the index (or indices) of the NZP CMR resource set in which the UE may perform CMR measurements accordingly. Alternatively, in another example, the base station may not yet have deactivated any of its antenna panels or sub-panels in the power savings mode, and thus may not provide such dynamic indication to the UE. Rather, in this example, the base station may determine which of its antenna panel(s) or sub-panel(s) to deactivate in response to CSI feedback from the UE. For instance, in response to receiving CSI-RS from the base station, the UE may measure CSI in the resources 806, 808 of the non-power saving CMR resource set 810 and the power saving CMR resource set 812 respectively. The UE may then provide a single CSI report including the CRI 820 associated with whichever resource has the best performance (e.g., the highest SINR), and the index 816 of the resource set (non-power saving or power saving) associated with the CRI. Alternatively, the UE may provide multiple CSI reports, one for each resource set (non-power saving and power saving), where each CSI report includes the CRI 820 associated with the resource having the best performance (e.g., highest SINR) and the index 816 of the resource set associated with the CRI. The UE may determine whether to provide the single CSI report or the multiple CSI reports in response to a configuration from the base station (e.g., in the CSI report configuration 802 or in another RRC message). In response to receiving the CSI report(s), the base station may determine whether to deactivate a number of its antenna panels or sub-panels to reduce energy expenditure efficiently. For example, the base station may determine to deactivate one or more of its antenna ports if the reported CSI associated with a power saving CMR resource indicates an acceptable level of channel quality (e.g., high SINR) compared to the CSI associated with a non-power saving CMR resource. In such case, the number of deactivated antenna ports may be based on the reported CSI (e.g., the level of channel quality) associated with the power saving CMR resource. Afterwards, the CSI measurement process may be similar to the previously described example. For instance, after the base station determines to deactivate one or more of its antenna ports, the base station may provide a dynamic indication to the UE indicating the index (or indices) of the NZP CMR resource set (and resource subsets) in which the UE may perform CMR measurements as previously described.
In the previously described examples, a single, power saving CMR resource set 812 (e.g., NZP CMR resource set n in
In one example, referring to
In another example, referring to
In some cases, the base station 904 may not provide message 910 (or 912) indicating the NZP CMR resource set in which UE 902 is to perform CSI measurements at block 915. For example, the base station 904 may not yet have deactivated any of its antenna panels 504 or sub-panels in the power savings mode 906, and thus may not provide a dynamic indication to the UE 902 to measure CSI in either power-saving or non-power saving resources. In such case, at block 926, the base station 904 may determine which of its antenna panel(s) 504 or sub-panel(s) to deactivate in response to CSI feedback (e.g., in CSI report 916 or 918) from the UE 902. For instance, referring to
In another example, referring to
At 1002, the UE obtains a CSI report configuration from a base station, where the CSI report configuration includes one or more measurement resource sets supporting deactivation of base station antenna ports (e.g., based on a power savings mode of the base station). For example, 1002 may be performed by CSI report configuration component 1240. For instance, referring to
In a first aspect, the one or more measurement resource sets may each comprise a first resource subset and a second resource subset, the second resource subset supporting the deactivation of base station antenna ports (e.g., based on a power savings mode of the base station). For example, referring to
In one example of the first aspect, the first resource subset may include a plurality of first resources each associated with a same first number of antenna ports, and the second resource subset may include a plurality of second resources each associated with a same second number of antenna ports. For instance, referring to
In a second aspect, the one or more measurement resource sets may comprise a first measurement resource set and a second measurement resource set. In one example of the second aspect, the second measurement resource set may support the deactivation of base station antenna ports (e.g., based on a power savings mode of the base station). For example, referring to
In one example of the second aspect, the second measurement resource set may include a resource subset, and the resource subset may include a plurality of resources each associated with a same number of antenna ports. For instance, referring to
At 1004, the UE sends a CSI report to the base station in response to a CSI measurement in the one or more measurement resource sets. For example, 1004 may be performed by CSI report component 1242. For instance, referring to
In one example of the first aspect, the one or more measurement resource sets may each comprise a first resource subset and a plurality of second resource subsets, the second resource subsets each supporting the deactivation of base station antenna ports (e.g., based on a power savings mode of the base station). For example, referring to
In another example of the first aspect, the one or more measurement resource sets may each comprise a first resource subset and a plurality of second resource subsets, the second resource subsets each supporting the deactivation of base station antenna ports (e.g., based on a power savings mode of the base station), and the CSI report may include a resource identifier and a resource subset identifier associated with the CSI measurement in response to the CSI report configuration including the second resource subsets. For example, referring to
In one example of the second aspect, at 1008, the UE may obtain a message from the base station indicating the first measurement resource set or the second measurement resource set for the CSI measurement, where the message comprises a MAC-CE or DCI. For example, 1008 may be performed by message component 1244. For instance, referring to
In another example of the second aspect, the second measurement resource set may include a plurality of resource subsets, and the message or an additional message from the base station may indicate at least one of the resource subsets for the CSI measurement. For example, referring to
In another example of the second aspect, the second measurement resource set may include a plurality of resource subsets, and the CSI report may include a resource identifier and a resource subset identifier associated with the CSI measurement in response to the CSI report configuration including the resource subsets. For example, referring to
In another example of the second aspect, the first measurement resource set may include default resources for the CSI measurement. For example, referring to
In another example of the second aspect, the CSI report may include a resource identifier and a resource set identifier associated with the CSI measurement in one of the first measurement resource set or the second measurement resource set. For example, referring to
In another example of the second aspect, at 1010, the UE may send a second CSI report to the base station. For example, 1010 may be performed by CSI report component 1242. The CSI report may include a first resource identifier and a first resource set identifier associated with the CSI measurement in the first measurement resource set, and the second CSI report may include a second resource identifier and a second resource set identifier associated with another CSI measurement in the second measurement resource set. For example, referring to
In another example of the second aspect, the one or more measurement resource sets may comprise a first measurement resource set and a plurality of second measurement resource sets, each of the second channel measurement resource sets supporting the deactivation of base station antenna ports (e.g., based on a power savings mode of the base station). For example, referring to
In another example of the second aspect, each of the second measurement resource sets may include a plurality of resources, and each of the resources in one of the second measurement resource sets may be associated with a same number of antenna ports. For example, referring to
At 1102, the base station sends a CSI report configuration to a UE, where the CSI report configuration includes one or more measurement resource sets supporting deactivation of base station antenna ports (e.g., based on a power savings mode of the base station). For example, 1102 may be performed by CSI report configuration component 1340. For instance, referring to
In a first aspect, the one or more measurement resource sets may each comprise a first resource subset and a second resource subset, the second resource subset supporting the deactivation of base station antenna ports (e.g., based on a power savings mode of the base station). For example, referring to
In one example of the first aspect, the first resource subset may include a plurality of first resources each associated with a same first number of antenna ports, and the second resource subset may include a plurality of second resources each associated with a same second number of antenna ports. For instance, referring to
In a second aspect, the one or more measurement resource sets may comprise a first measurement resource set and a second measurement resource set. In one example of the second aspect, the second measurement resource set may support the deactivation of base station antenna ports (e.g., based on a power savings mode of the base station). For example, referring to
At 1104, the base station obtains a CSI report from the UE in response to a CSI measurement in the one or more measurement resource sets. For example, 1104 may be performed by CSI report component 1342. For instance, referring to
In one example of the first aspect, the one or more measurement resource sets may each comprise a first resource subset and a plurality of second resource subsets, the second resource subsets each supporting the deactivation of base station antenna ports (e.g., based on a power savings mode of the base station), and the CSI report may include a resource identifier and a resource subset identifier associated with the CSI measurement in response to the CSI report configuration including the second resource subsets. For example, referring to
In one example of the second aspect, the one or more measurement resource sets may comprise a first measurement resource set and a plurality of second measurement resource sets, and each of the second measurement resource sets supporting the deactivation of base station antenna ports (e.g., based on a power savings mode of the base station). For example, referring to
In another example of the second aspect, each of the second measurement resource sets may include a plurality of resources, and each of the resources in one of the second measurement resource sets may be associated with a same number of antenna ports. For example, referring to
The communication manager 1232 includes a CSI report configuration component 1240 that is configured to obtain a CSI report configuration from a base station, where the CSI report configuration includes one or more measurement resource sets supporting deactivation of base station antenna ports, e.g., as described in connection with 1002. The communication manager 1232 further includes a CSI report component 1242 that receives input in the form of the one or more measurement resource sets from the CSI report configuration component 1240 and is configured to send a CSI report to the base station in response to a CSI measurement in the one or more measurement resource sets, e.g., as described in connection with 1004. The communication manager 1232 further includes a message component 1244 that receives input in the form of the one or more measurement resource sets each comprising a first resource subset and a plurality of second resource subsets from the CSI report configuration component 1240 and is configured to obtain a message from the base station indicating at least one of the second resource subsets for the CSI measurement, where the message comprises a MAC-CE or DCI, e.g., as described in connection with 1006. The message component 1244 further receives input in the form of the one or more measurement resource sets comprising a first measurement resource set and a second measurement resource set from the CSI report configuration component 1240 and is further configured to obtain a message from the base station indicating the first measurement resource set or the second measurement resource set for the CSI measurement, where the message comprises a MAC-CE or DCI, e.g., as described in connection with 1008. The CSI report component 1242 further receives input in the form of the one or more measurement resource sets comprising a first measurement resource set and a second measurement resource set from the CSI report configuration component 1240 and is further configured to send a second CSI report to the base station, where the CSI report includes a first resource identifier and a first resource set identifier associated with the CSI measurement in the first measurement resource set, and where the second CSI report includes a second resource identifier and a second resource set identifier associated with another CSI measurement in the second measurement resource set, e.g., as described in connection with 1010.
The apparatus may include additional components that perform each of the blocks of the algorithm in the aforementioned flowcharts of
In one configuration, the apparatus 1202, and in particular the cellular baseband processor 1204, includes means for obtaining a channel state information (CSI) report configuration from a base station, wherein the CSI report configuration includes one or more measurement resource sets supporting deactivation of base station antenna ports; and means for sending a CSI report to the base station in response to a CSI measurement in the one or more measurement resource sets.
In one configuration, the one or more measurement resource sets may each comprise a first resource subset and a second resource subset, the second resource subset supporting the deactivation of base station antenna ports, where the first resource subset includes a plurality of first resources each associated with a same first number of antenna ports, and the second resource subset includes a plurality of second resources each associated with a same second number of antenna ports.
In one configuration, the one or more measurement resource sets may each comprise a first resource subset and a plurality of second resource subsets, the second resource subsets each supporting the deactivation of base station antenna ports, and the means for obtaining may be further configured to obtain a message from the base station indicating at least one of the first resource subsets and the second resource subsets for the CSI measurement, wherein the message comprises a medium access control (MAC) control element (MAC-CE) or downlink control information (DCI).
In one configuration, the one or more measurement resource sets may comprise a first measurement resource set and a second measurement resource set, the second measurement resource set supporting the deactivation of base station antenna ports, where the first resource set includes a plurality of first resources each associated with a same first number of antenna ports, and the second resource set includes a plurality of second resources each associated with a same second number of antenna ports.
In one configuration, the means for obtaining may be further configured to obtain a message from the base station indicating the first measurement resource set or the second measurement resource set for the CSI measurement, wherein the message comprises a medium access control (MAC) control element (MAC-CE) or downlink control information (DCI).
In one configuration, the means for sending may be further configured to send a second CSI report to the base station; wherein the CSI report includes a first resource identifier and a first resource set identifier associated with the CSI measurement in the first measurement resource set; and wherein the second CSI report includes a second resource identifier and a second resource set identifier associated with another CSI measurement in the second measurement resource set.
The aforementioned means may be one or more of the aforementioned components of the apparatus 1202 configured to perform the functions recited by the aforementioned means. As described supra, the apparatus 1202 may include the TX Processor 368, the RX Processor 356, and the controller/processor 359. As such, in one configuration, the aforementioned means may be the TX Processor 368, the RX Processor 356, and the controller/processor 359 configured to perform the functions recited by the aforementioned means.
The communication manager 1332 includes a CSI report configuration component 1340 that is configured to send a CSI report configuration to a UE, where the CSI report configuration includes one or more measurement resource sets supporting deactivation of base station antenna ports, e.g., as described in connection with 1102. The communication manager 1332 further includes a CSI report component 1342 that receives input in the form of the one or more measurement resource sets from the CSI report configuration component 1340 and is configured to obtain a CSI report from the UE in response to a CSI measurement in the one or more measurement resource sets, e.g., as described in connection with 1104.
The apparatus may include additional components that perform each of the blocks of the algorithm in the aforementioned flowcharts of
In one configuration, the apparatus 1302, and in particular the baseband unit 1304, includes means for sending a channel state information (CSI) report configuration to a user equipment (UE), wherein the CSI report configuration includes one or more measurement resource sets supporting deactivation of base station antenna ports; and means for obtaining a CSI report from the UE in response to a CSI measurement in the one or more measurement resource sets.
The aforementioned means may be one or more of the aforementioned components of the apparatus 1302 configured to perform the functions recited by the aforementioned means. As described supra, the apparatus 1302 may include the TX Processor 316, the RX Processor 370, and the controller/processor 375. As such, in one configuration, the aforementioned means may be the TX Processor 316, the RX Processor 370, and the controller/processor 375 configured to perform the functions recited by the aforementioned means.
Accordingly, aspects of the present disclosure allow a base station to provide CSI report configurations and a UE to provide CSI reports in response to such configurations which account for a power savings mode of the base station. While the base station is operating in the power savings mode, the base station may deactivate one or more of its antenna panels or sub-panels to reduce energy expenditure (e.g., in dynamic antenna port adaptation). Therefore, to account for this antenna port deactivation, the base station may configure one or more resource sets (e.g., NZP CMR, CSI-IM, or NZP IMR) in the CSI report configuration including power saving resources and non-power saving resources. In one example, the base station may dynamically indicate (e.g., via a MAC-CE or DCI) whether the base station is transmitting CSI-RS in power saving resources or non-power saving resources, and the UE may measure CSI in the indicated resources accordingly for CSI reporting. Such approach allows the base station to efficiently configure CSI reporting for dynamic antenna port adaptation through a single CSI report configuration, rather than inefficiently through multiple CSI report configurations to support dynamic antenna port adaptation (or different dynamic antenna port adaptations). In another example, the UE may measure CSI in power saving resources and non-power saving resources for CSI reporting, and the base station may determine from the CSI report which antenna ports (e.g., panels or sub-panels) to deactivate. Such approach allows the UE to become involved in the dynamic antenna port adaptation process (e.g., which antenna ports the base station may deactivate) and thus promotes UE involvement in network energy saving efforts. In a further example, the previous two examples may be combined. For instance, after the base station determines which antenna ports to deactivate from the CSI report as in the aforementioned second example, the base station may provide dynamic indications of resources as in the aforementioned first example. In this way, UE involvement in network energy savings with efficient CSI report configurations may be achieved.
It is understood that the specific order or hierarchy of blocks in the processes/flowcharts disclosed is an illustration of example approaches. Based upon design preferences, it is understood that the specific order or hierarchy of blocks in the processes/flowcharts may be rearranged. Further, some blocks may be combined or omitted. The accompanying method claims present elements of the various blocks in a sample order, and are not meant to be limited to the specific order or hierarchy presented.
The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown herein, but is to be accorded the full scope consistent with the language claims, wherein reference to an element in the singular is not intended to mean “one and only one” unless specifically so stated, but rather “one or more.” Terms such as “if,” “when,” and “while” should be interpreted to mean “under the condition that” rather than imply an immediate temporal relationship or reaction. That is, these phrases, e.g., “when,” do not imply an immediate action in response to or during the occurrence of an action, but simply imply that if a condition is met then an action will occur, but without requiring a specific or immediate time constraint for the action to occur. The word “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any aspect described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other aspects. Unless specifically stated otherwise, the term “some” refers to one or more. Combinations such as “at least one of A, B, or C,” “one or more of A, B, or C,” “at least one of A, B, and C,” “one or more of A, B, and C,” and “A, B, C, or any combination thereof” include any combination of A, B, and/or C, and may include multiples of A, multiples of B, or multiples of C. Specifically, combinations such as “at least one of A, B, or C,” “one or more of A, B, or C,” “at least one of A, B, and C,” “one or more of A, B, and C,” and “A, B, C, or any combination thereof” may be A only, B only, C only, A and B, A and C, B and C, or A and B and C, where any such combinations may contain one or more member or members of A, B, or C. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. The words “module,” “mechanism,” “element,” “device,” and the like may not be a substitute for the word “means.” As such, no claim element is to be construed as a means plus function unless the element is expressly recited using the phrase “means for.”
The following examples are illustrative only and may be combined with aspects of other embodiments or teachings described herein, without limitation.
Example 1 is a method of wireless communication at a user equipment (UE), comprising: obtaining a channel state information (CSI) report configuration from a base station, wherein the CSI report configuration includes one or more measurement resource sets supporting deactivation of base station antenna ports; and sending a CSI report to the base station in response to a CSI measurement in the one or more measurement resource sets.
Example 2 is the method of Example 1, wherein the one or more measurement resource sets each comprise a first resource subset and a second resource subset, the second resource subset supporting the deactivation of base station antenna ports, wherein the first resource subset includes a plurality of first resources each associated with a same first number of antenna ports, and the second resource subset includes a plurality of second resources each associated with a same second number of antenna ports.
Example 3 is the method of Examples 1 or 2, wherein the one or more measurement resource sets each comprise a first resource subset and a plurality of second resource subsets, the second resource subsets each supporting the deactivation of base station antenna ports, the method further comprising: obtaining a message from the base station indicating at least one of the first resource subsets and the second resource subsets for the CSI measurement, wherein the message comprises a medium access control (MAC) control element (MAC-CE) or downlink control information (DCI).
Example 4 is the method of any of Examples 1 or 2, wherein the one or more measurement resource sets each comprise a first resource subset and a plurality of second resource subsets, the second resource subsets each supporting the deactivation of base station antenna ports, and the CSI report includes a resource identifier and a resource subset identifier associated with the CSI measurement in response to the CSI report configuration including the second resource subsets.
Example 5 is the method of Example 1, wherein the one or more measurement resource sets comprise a first measurement resource set and a second measurement resource set, the second measurement resource set supporting the deactivation of base station antenna ports, wherein the first resource set includes a plurality of first resources each associated with a same first number of antenna ports, and the second resource set includes a plurality of second resources each associated with a same second number of antenna ports.
Example 6 is the method of Example 5, wherein the second measurement resource set includes a resource subset, and the resource subset includes a plurality of resources each associated with a same number of antenna ports.
Example 7 is the method of Example 5 or 6, further comprising: obtaining a message from the base station indicating the first measurement resource set or the second measurement resource set for the CSI measurement, wherein the message comprises a medium access control (MAC) control element (MAC-CE) or downlink control information (DCI).
Example 8 is the method of Example 7, wherein the second measurement resource set includes a plurality of resource subsets, and the message or an additional message from the base station indicates at least one of the resource subsets for the CSI measurement.
Example 9 is the method of any of Examples 5 to 8, wherein the second measurement resource set includes a plurality of resource subsets, and the CSI report includes a resource identifier and a resource subset identifier associated with the CSI measurement in response to the CSI report configuration including the resource subsets.
Example 10 is the method of any of Examples 5 to 9, wherein the first measurement resource set includes default resources for the CSI measurement.
Example 11 is the method of Example 5, wherein the CSI report includes a resource identifier and a resource set identifier associated with the CSI measurement in one of the first measurement resource set or the second measurement resource set.
Example 12 is the method of Example 5, further comprising: sending a second CSI report to the base station; wherein the CSI report includes a first resource identifier and a first resource set identifier associated with the CSI measurement in the first measurement resource set; and wherein the second CSI report includes a second resource identifier and a second resource set identifier associated with another CSI measurement in the second measurement resource set.
Example 13 is the method of any of Examples 1 or 5 to 12, wherein the one or more measurement resource sets comprise a first measurement resource set and a plurality of second measurement resource sets, each of the second measurement resource sets supporting the deactivation of base station antenna ports, wherein each of the second measurement resource sets includes a plurality of resources, and each of the resources in one of the second measurement resource sets is associated with a same number of antenna ports.
Example 14 is an apparatus for wireless communication, comprising: a processor; memory coupled with the processor; and instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to: obtain a channel state information (CSI) report configuration from a base station, wherein the CSI report configuration includes one or more measurement resource sets supporting deactivation of base station antenna ports; and send a CSI report to the base station in response to a CSI measurement in the one or more measurement resource sets.
Example 15 is the apparatus of Example 14, wherein the one or more measurement resource sets each comprise a first resource subset and a second resource subset, the second resource subset supporting the deactivation of base station antenna ports, wherein the first resource subset includes a plurality of first resources each associated with a same first number of antenna ports, and the second resource subset includes a plurality of second resources each associated with a same second number of antenna ports.
Example 16 is the apparatus of Examples 14 or 15, wherein the one or more measurement resource sets each comprise a first resource subset and a plurality of second resource subsets, the second resource subsets each supporting the deactivation of base station antenna ports, and the instructions, when executed by the processor, further cause the apparatus to: obtain a message from the base station indicating at least one of the first resource subsets and the second resource subsets for the CSI measurement, wherein the message comprises a medium access control (MAC) control element (MAC-CE) or downlink control information (DCI).
Example 17 is the apparatus of Examples 14 or 15, wherein the one or more measurement resource sets each comprise a first resource subset and a plurality of second resource subsets, the second resource subsets each supporting the deactivation of base station antenna ports, and the CSI report includes a resource identifier and a resource subset identifier associated with the CSI measurement in response to the CSI report configuration including the second resource subsets.
Example 18 is the apparatus of Example 14, wherein the one or more measurement resource sets comprise a first measurement resource set and a second measurement resource set, the second measurement resource set supporting the deactivation of base station antenna ports, wherein the first resource set includes a plurality of first resources each associated with a same first number of antenna ports, and the second resource set includes a plurality of second resources each associated with a same second number of antenna ports.
Example 19 is the apparatus of Example 18, wherein the instructions, when executed by the processor, further cause the apparatus to: obtain a message from the base station indicating the first measurement resource set or the second measurement resource set for the CSI measurement, wherein the message comprises a medium access control (MAC) control element (MAC-CE) or downlink control information (DCI).
Example 20 is the apparatus of Example 18, wherein the instructions, when executed by the processor, further cause the apparatus to: send a second CSI report to the base station; wherein the CSI report includes a first resource identifier and a first resource set identifier associated with the CSI measurement in the first measurement resource set; and associated with another CSI measurement in the second measurement resource set.
Example 21 is a method of wireless communication at a base station, comprising: sending a channel state information (CSI) report configuration to a user equipment (UE), wherein the CSI report configuration includes one or more measurement resource sets supporting deactivation of base station antenna ports; and obtaining a CSI report from the UE in response to a CSI measurement in the one or more measurement resource sets.
Example 22 is the method of Example 21, wherein the one or more measurement resource sets each comprise a first resource subset and a second resource subset, the second resource subset supporting the deactivation of base station antenna ports, wherein the first resource subset includes a plurality of first resources each associated with a same first number of antenna ports, and the second resource subset includes a plurality of second resources each associated with a same second number of antenna ports.
Example 23 is the method of Examples 21 or 22, wherein the one or more measurement resource sets each comprise a first resource subset and a plurality of second resource subsets, the second resource subsets each supporting the deactivation of base station antenna ports, and the CSI report includes a resource identifier and a resource subset identifier associated with the CSI measurement in response to the CSI report configuration including the second resource subsets.
Example 24 is the method of Example 21, wherein the one or more measurement resource sets comprise a first measurement resource set and a second measurement resource set, the second measurement resource set supporting the deactivation of base station antenna ports, wherein the first resource set includes a plurality of first resources each associated with a same first number of antenna ports, and the second resource set includes a plurality of second resources each associated with a same second number of antenna ports.
Example 25 is the method of Examples 21 or 24, wherein the one or more measurement resource sets comprise a first measurement resource set and a plurality of second measurement resource sets, each of the second measurement resource sets supporting the deactivation of base station antenna ports, wherein each of the second measurement resource sets includes a plurality of resources, and each of the resources in one of the second measurement resource sets is associated with a same number of antenna ports.
Example 26 is an apparatus for wireless communication, comprising: a processor; memory coupled with the processor; and instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to: send a channel state information (CSI) report configuration to a user equipment (UE), wherein the CSI report configuration includes one or more measurement resource sets supporting deactivation of base station antenna ports; and obtain a CSI report from the UE in response to a CSI measurement in the one or more measurement resource sets.
Example 27 is the apparatus of Example 26, wherein the one or more measurement resource sets each comprise a first resource subset and a second resource subset, the second resource subset supporting the deactivation of base station antenna ports, wherein the first resource subset includes a plurality of first resources each associated with a same first number of antenna ports, and the second resource subset includes a plurality of second resources each associated with a same second number of antenna ports.
Example 28 is the apparatus of Examples 26 or 27, wherein the one or more measurement resource sets each comprise a first resource subset and a plurality of second resource subsets, the second resource subsets each supporting the deactivation of base station antenna ports, and the CSI report includes a resource identifier and a resource subset identifier associated with the CSI measurement in response to the CSI report configuration including the second resource subsets.
Example 29 is the apparatus of Example 26, wherein the one or more measurement resource sets comprise a first measurement resource set and a second measurement resource set, the second measurement resource set supporting the deactivation of base station antenna ports, wherein the first resource set includes a plurality of first resources each associated with a same first number of antenna ports, and the second resource set includes a plurality of second resources each associated with a same second number of antenna ports.
Example 30 is the apparatus of Examples 26 or 29, wherein the one or more measurement resource sets comprise a first measurement resource set and a plurality of second measurement resource sets, each of the second measurement resource sets supporting the deactivation of base station antenna ports, wherein each of the second measurement resource sets includes a plurality of resources, and each of the resources in one of the second measurement resource sets is associated with a same number of antenna ports.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2021/122182 | 9/30/2021 | WO |
