WO2020221371A1 - Détermination de coefficient pour rapport de csi compressé de type ii avec surdébit réduit - Google Patents

Détermination de coefficient pour rapport de csi compressé de type ii avec surdébit réduit Download PDF

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Publication number
WO2020221371A1
WO2020221371A1 PCT/CN2020/088560 CN2020088560W WO2020221371A1 WO 2020221371 A1 WO2020221371 A1 WO 2020221371A1 CN 2020088560 W CN2020088560 W CN 2020088560W WO 2020221371 A1 WO2020221371 A1 WO 2020221371A1
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WO
WIPO (PCT)
Prior art keywords
linear combination
combination coefficients
report
per rank
csi
Prior art date
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PCT/CN2020/088560
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English (en)
Inventor
Liangming WU
Chenxi HAO
Qiaoyu Li
Yu Zhang
Chao Wei
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Qualcomm Incorporated
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Publication of WO2020221371A1 publication Critical patent/WO2020221371A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0645—Variable feedback
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0486—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking channel rank into account
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0634—Antenna weights or vector/matrix coefficients

Definitions

  • aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for channel state information (CSI) reporting.
  • CSI channel state information
  • Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcasts, etc. These wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.) .
  • multiple-access systems include 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) systems, LTE Advanced (LTE-A) systems, 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, to name a few.
  • 3GPP 3rd Generation Partnership Project
  • LTE Long Term Evolution
  • LTE-A LTE Advanced
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency
  • New radio e.g., 5G NR
  • 5G NR is an example of an emerging telecommunication standard.
  • NR is a set of enhancements to the LTE mobile standard promulgated by 3GPP.
  • NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using OFDMA with a cyclic prefix (CP) on the downlink (DL) and on the uplink (UL) .
  • CP cyclic prefix
  • NR supports beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.
  • MIMO multiple-input multiple-output
  • Certain aspects provide a method for wireless communication by a user equipment (UE) .
  • the method generally includes receiving a CSI report configuration.
  • the CSI report configuration configures the UE for reporting frequency domain compressed precoding matrix information including, for each layer, and for one or more selected beams, a configured number of linear combination coefficients to report per rank.
  • the method generally includes determining an actual number of linear combination coefficients to report per rank based, at least in part, on the configured number of linear combination coefficients to report per rank and a computed number of supported linear combination coefficients per rank.
  • the method generally includes sending a CSI report based on the actual number of linear combination coefficients to report per rank.
  • Certain aspects provide a method for wireless communication by a base station (BS) .
  • the method generally includes sending a UE a CSI report configuration.
  • the CSI report configuration configures the UE for reporting frequency domain compressed precoding matrix information including, for each layer, and for one or more selected beams, a configured number of linear combination coefficients to report per rank.
  • the method generally includes determining an actual number of linear combination coefficients per rank the UE reports based, at least in part, on the configured number of linear combination coefficients to report per rank and a computed number of linear combination coefficients per rank the UE supports for CSI reporting.
  • the method generally includes processing a CSI report from the UE based on the determined actual number of linear combination coefficients per rank the UE reports.
  • the apparatus generally includes at least one processor and a memory coupled to the at least one processor.
  • the memory includes code executable by the at least one processor to cause the apparatus to receive a CSI report configuration.
  • the CSI report configuration configures the apparatus for reporting frequency domain compressed precoding matrix information including, for each layer, and for one or more selected beams, a configured number of linear combination coefficients to report per rank.
  • the memory includes code executable by the at least one processor to cause the apparatus to determine an actual number of linear combination coefficients to report per rank based, at least in part, on the configured number of linear combination coefficients to report per rank and a computed number of supported linear combination coefficients per rank.
  • memory includes code executable by the at least one processor to cause the apparatus to send a CSI report based on the actual number of linear combination coefficients to report per rank.
  • the apparatus generally includes at least one processor and a memory coupled to the at least one processor.
  • the memory includes code executable by the at least one processor to cause the apparatus to send a UE a CSI report configuration.
  • the CSI report configuration configures the UE for reporting frequency domain compressed precoding matrix information including, for each layer, and for one or more selected beams, a configured number of linear combination coefficients to report per rank.
  • the memory includes code executable by the at least one processor to cause the apparatus to determine an actual number of linear combination coefficients per rank the UE reports based, at least in part, on the configured number of linear combination coefficients to report per rank and a computed number of linear combination coefficients per rank the UE supports for CSI reporting.
  • the memory includes code executable by the at least one processor to cause the apparatus to process a CSI report from the UE based on the determined actual number of linear combination coefficients per rank the UE reports.
  • the apparatus generally includes means for receiving a CSI report configuration.
  • the CSI report configuration configures the apparatus for reporting frequency domain compressed precoding matrix information including, for each layer, and for one or more selected beams, a configured number of linear combination coefficients to report per rank.
  • the apparatus generally includes means for determining an actual number of linear combination coefficients to report per rank based, at least in part, on the configured number of linear combination coefficients to report per rank and a computed number of supported linear combination coefficients per rank.
  • the apparatus generally includes means for sending a CSI report based on the actual number of linear combination coefficients to report per rank.
  • the apparatus generally includes means for sending a UE a CSI report configuration.
  • the CSI report configuration configures the UE for reporting frequency domain compressed precoding matrix information including, for each layer, and for one or more selected beams, a configured number of linear combination coefficients to report per rank.
  • the apparatus generally includes means for determining an actual number of linear combination coefficients per rank the UE reports based, at least in part, on the configured number of linear combination coefficients to report per rank and a computed number of linear combination coefficients per rank the UE supports for CSI reporting.
  • the apparatus generally includes means for processing a CSI report from the UE based on the determined actual number of linear combination coefficients per rank the UE reports.
  • the computer readable medium generally includes code for receiving a CSI report configuration.
  • the CSI report configuration configures a UE for reporting frequency domain compressed precoding matrix information including, for each layer, and for one or more selected beams, a configured number of linear combination coefficients to report per rank.
  • the computer readable medium generally includes code for determining an actual number of linear combination coefficients to report per rank based, at least in part, on the configured number of linear combination coefficients to report per rank and a computed number of supported linear combination coefficients per rank.
  • the computer readable medium generally includes code for sending a CSI report based on the actual number of linear combination coefficients to report per rank.
  • the computer readable medium generally includes code for sending a UE a CSI report configuration.
  • the CSI report configuration configures the UE for reporting frequency domain compressed precoding matrix information including, for each layer, and for one or more selected beams, a configured number of linear combination coefficients to report per rank.
  • the computer readable medium generally includes code for determining an actual number of linear combination coefficients per rank the UE reports based, at least in part, on the configured number of linear combination coefficients to report per rank and a computed number of linear combination coefficients per rank the UE supports for CSI reporting.
  • the computer readable medium generally includes code for processing a CSI report from the UE based on the determined actual number of linear combination coefficients per rank the UE reports.
  • the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims.
  • the following description and the appended 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.
  • FIG. 1 is a block diagram conceptually illustrating an example telecommunications system, in accordance with certain aspects of the present disclosure.
  • FIG. 2 is a block diagram conceptually illustrating a design of an example base station (BS) and user equipment (UE) , in accordance with certain aspects of the present disclosure.
  • BS base station
  • UE user equipment
  • FIG. 3 is an example frame format for certain wireless communication systems (e.g., new radio (NR) ) , in accordance with certain aspects of the present disclosure.
  • NR new radio
  • FIG. 4A illustrates example oversampled beam for Type 1 channel state information (CSI) feedback, in accordance with certain aspects of the present disclosure.
  • CSI channel state information
  • FIG. 4B illustrates example oversampled beam for Type I1 CSI feedback, in accordance with certain aspects of the present disclosure.
  • FIG. 5 is a block diagram showing example precoder matrix feedback without frequency domain compression and with frequency domain compression, in accordance with certain aspects of the present disclosure.
  • FIG. 6 is a block diagram showing example precoder matrix feedback with frequency domain compression for multiple layers, in accordance with certain aspects of the present disclosure.
  • FIG. 7A illustrates example uplink control information (UCI) part one for a CSI report, in accordance with certain aspects of the present disclosure.
  • UCI uplink control information
  • FIG. 7B illustrates example UCI part two for a CSI report, in accordance with certain aspects of the present disclosure.
  • FIG. 8 is an example matrix illustrating basis selection reporting for CSI reporting, in accordance with certain aspects of the present disclosure.
  • FIG. 9 is an example matrix illustrating a coefficient subset for CSI reporting, in accordance with certain aspects of the present disclosure.
  • FIG. 10 is a flow diagram illustrating example operations for wireless communication by a UE, in accordance with certain aspects of the present disclosure.
  • FIG. 11 is a flow diagram illustrating example operations for wireless communication by a BS, in accordance with certain aspects of the present disclosure.
  • FIG. 12 illustrates a communications device that may include various components configured to perform operations for the techniques disclosed herein in accordance with aspects of the present disclosure.
  • FIG. 13 illustrates a communications device that may include various components configured to perform operations for the techniques disclosed herein in accordance with aspects of the present disclosure.
  • aspects of the present disclosure provide apparatus, methods, processing systems, and computer readable mediums for channel state information (CSI) reporting.
  • CSI channel state information
  • a user equipment is configured for CSI reporting.
  • the UE may be configured for Type-II reporting of frequency domain (FD) compressed CSI feedback.
  • the UE can be configured with a number of linear combination coefficients to report per rank, K 0 .
  • the UE is also configured with resources for the CSI reporting. In some cases, the resources configured for the CSI reporting are insufficient to report configured with a number of linear combination coefficients to report per rank, K 0 . In this case, the UE may omit some of the linear combination coefficients to be reported (e.g., even though the UE may have computed CSI for the configured with a number of linear combination coefficients to report per rank, K 0 ) .
  • Release-15 5G NR defines rules for CSI omission on certain even/odd subbands.
  • the UE can determine a supported payload size for the UCI.
  • the UE can determine the supported number of coefficients per rank for CSI reporting, K r , and then determine whether the UE can report the configured number of linear combination coefficients to report per rank, K 0 , or a smaller computed number of supported coefficients.
  • the UE may compute the CSI and report the linear combination coefficients based on the actual number of supported coefficients.
  • the overhead can be reduced and CSI omission avoided.
  • any number of wireless networks may be deployed in a given geographic area.
  • Each wireless network may support a particular radio access technology (RAT) and may operate on one or more frequencies.
  • a RAT may also be referred to as a radio technology, an air interface, etc.
  • a frequency may also be referred to as a carrier, a subcarrier, a frequency channel, a tone, a subband, etc.
  • Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs.
  • NR or 5G RAT networks may be deployed.
  • NR access may support various wireless communication services, such as enhanced mobile broadband (eMBB) targeting wide bandwidth (e.g., 80 MHz or beyond) , millimeter wave (mmW) targeting high carrier frequency (e.g., 24 GHz to 53 GHz or beyond) , massive machine type communications MTC (mMTC) targeting non-backward compatible MTC techniques, and/or mission critical targeting ultra-reliable low-latency communications (URLLC) .
  • eMBB enhanced mobile broadband
  • mmW millimeter wave
  • mMTC massive machine type communications MTC
  • URLLC ultra-reliable low-latency communications
  • These services may include latency and reliability requirements.
  • These services may also have different transmission time intervals (TTI) to meet respective quality of service (QoS) requirements.
  • TTI transmission time intervals
  • QoS quality of service
  • these services may co-exist in the same subframe.
  • NR supports beamforming and beam direction may be dynamically configured. MIMO transmissions with precoding may also be supported.
  • MIMO configurations in the DL may support up to 8 transmit antennas with multi-layer DL transmissions up to 8 streams and up to 2 streams per UE. Multi-layer transmissions with up to 2 streams per UE may be supported. Aggregation of multiple cells may be supported with up to 8 serving cells.
  • FIG. 1 illustrates an example wireless communication network 100 in which aspects of the present disclosure may be performed.
  • the wireless communication network 100 may be in communication with a core network 132.
  • the core network 132 may in communication with one or more base station (BSs) 110110a-z (each also individually referred to herein as BS 110 or collectively as BSs 110) and/or user equipment (UE) 120 in the wireless communication network 100 via one or more interfaces.
  • BSs base station
  • UE user equipment
  • Each BS 110 may provide communication coverage for a particular geographic area, sometimes referred to as a “cell” , which may be stationary or may move according to the location of a mobile BS 110.
  • the BSs 110 may be interconnected to one another and/or to one or more other network nodes (not shown) in wireless communication network 100 through various types of backhaul interfaces (e.g., a direct physical connection, a wireless connection, a virtual network, or the like) using any suitable transport network.
  • the BSs 110a, 110b and 110c may be macro BSs for the macro cells 102a, 102b and 102c, respectively.
  • the BS 110x may be a pico BS for a pico cell 102x.
  • the BSs 110y and 110z may be femto BSs for the femto cells 102y and 102z, respectively.
  • a BS may support one or multiple cells.
  • the BSs 110 communicate with the UEs 120 in the wireless communication network 100.
  • the UEs 120 (e.g., 120x, 120y, etc.) may be dispersed throughout the wireless communication network 100, and each UE 120 may be stationary or mobile.
  • Wireless communication network 100 may also include relay stations (e.g., relay station 110r) , also referred to as relays or the like, that receive a transmission of data and/or other information from an upstream station (e.g., a BS 110a or a UE 120r) and sends a transmission of the data and/or other information to a downstream station (e.g., a UE 120 or a BS 110) , or that relays transmissions between UEs 120, to facilitate communication between devices.
  • relay stations e.g., relay station 110r
  • relays or the like that receive a transmission of data and/or other information from an upstream station (e.g., a BS 110a or a UE 120r) and sends a transmission of the data and/or other information to a downstream station (e.g., a UE 120 or a BS 110) , or that relays transmissions between UEs 120, to facilitate communication between devices.
  • a network controller 130 may be in communication with a set of BSs 110 and provide coordination and control for these BSs 110.
  • the network controller 130 may communicate with the BSs 110 via a backhaul.
  • the network controller 130 may be in communication with a core network 132 (e.g., a 5G Core Network (5GC) ) , which provides various network functions such as Access and Mobility Management, Session Management, User Plane Function, Policy Control Function, Authentication Server Function, Unified Data Management, Application Function, Network Exposure Function, Network Repository Function, Network Slice Selection Function, etc.
  • 5GC 5G Core Network
  • the BSs 110 and UEs 120 may be configured for CSI reporting in accordance with aspects of the disclosure.
  • the UE 120a includes a CSI reporting manager 122.
  • the CSI reporting manager 122 may be configured to determine an actual number of linear combination coefficients to report per rank based, at least in part, on a configured number of linear combination coefficients to report per rank and a computed number of supported linear combination coefficients per rank, compute the CSI report and the send the CSI report based on the determined actual number of linear combination coefficients to report per rank, in accordance with aspects of the disclosure.
  • the UE 120a may be compute and report the CSI to the BS 110a without omitting any of the coefficients, and with reduced overhead.
  • FIG. 1 the UE 120a may be compute and report the CSI to the BS 110a without omitting any of the coefficients, and with reduced overhead.
  • the BS 110a includes a CSI reporting manager 112.
  • the CSI report manager 112 may be configured to configure the UE 120a with a CSI reporting configuration, configuring the number of linear combination coefficients to report per rank.
  • the CSI reporting manager 112 may be configured to determine the actual number of linear combination coefficients for the UE 120a report per rank based, at least in part, on a configured number of linear combination coefficients to report per rank and a computed number of supported linear combination coefficients per rank supported by the UE 120a, in accordance with certain aspects of the present disclosure.
  • the BS 110a may process a CSI report received from the UE 120a based on the determined actual number of linear combination coefficients per rank for the UE 120a to report.
  • FIG. 2 illustrates example components of BS 110a and UE 120a (e.g., in the wireless communication network 100 of FIG. 1) , which may be used to implement aspects of the present disclosure.
  • antennas 252, processors 266, 258, 264, and/or controller/processor 280 of the UE 120a and/or antennas 234, processors 220, 230, 238, and/or controller/processor 240 of the BS 110a may be used to perform the various techniques and methods described herein.
  • a transmit processor 220 may receive data from a data source 212 and control information from a controller/processor 240.
  • the control information may be for the physical broadcast channel (PBCH) , physical control format indicator channel (PCFICH) , physical hybrid ARQ indicator channel (PHICH) , physical downlink control channel (PDCCH) , group common PDCCH (GC PDCCH) , etc.
  • the data may be for the physical downlink shared channel (PDSCH) , etc.
  • the processor 220 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively.
  • the transmit processor 220 may also generate reference symbols, such as for the primary synchronization signal (PSS) , secondary synchronization signal (SSS) , and channel state information reference signal (CSI-RS) .
  • a transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and/or the reference symbols, if applicable, and may provide output symbol streams to the modulators (MODs) 232a-232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream.
  • Each modulator may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
  • Downlink signals from modulators 232a-232t may be transmitted via the antennas 234a-234t, respectively.
  • the antennas 252a-252r may receive the downlink signals from the BS 110a and may provide received signals to the demodulators (DEMODs) in transceivers 254a-254r, respectively.
  • Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples.
  • Each demodulator may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols.
  • a MIMO detector 256 may obtain received symbols from all the demodulators 254a-254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • a receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 120a to a data sink 260, and provide decoded control information to a controller/processor 280.
  • a transmit processor 264 may receive and process data (e.g., for the physical uplink shared channel (PUSCH) ) from a data source 262 and control information (e.g., for the physical uplink control channel (PUCCH) from the controller/processor 280.
  • the transmit processor 264 may also generate reference symbols for a reference signal (e.g., for the sounding reference signal (SRS) ) .
  • the symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by the modulators in transceivers 254a-254r (e.g., for SC-FDM, etc.) , and transmitted to the BS 110a.
  • the uplink signals from the UE 120a may be received by the antennas 234, processed by the demodulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by the UE 120a.
  • the receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to the controller/processor 240.
  • the memories 242 and 282 may store data and program codes for BS 110a and UE 120a, respectively.
  • a scheduler 244 may schedule UEs for data transmission on the downlink and/or uplink.
  • the controller/processor 280 and/or other processors and modules at the UE 120a may perform or direct the execution of processes for the techniques described herein.
  • the controller/processor 280 of the UE 120a has a CSI reporting manager 281 that may be configured for receiving a CSI report configuration, determining an actual number of linear combination coefficients per rank to report, and/or sending a CSI report based on the determined actual number of linear combination coefficients per rank, according to aspects described herein.
  • the controller/processor 240 and/or other processors and modules at the BS 110a may perform or direct the execution of processes for the techniques described herein.
  • the controller/processor 240 of the BS 110a has a CSI reporting manager 241 that may be configured for configuring the UE 120a with a CSI report configuration, determining an actual number of linear combination coefficients per rank the UE 120a report, and/or processing a CSI report from the UE 120a based on the determined actual number of linear combination coefficients per rank the UE 120a reports, according to aspects described herein.
  • NR may utilize orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) on the uplink and downlink.
  • OFDM orthogonal frequency division multiplexing
  • CP cyclic prefix
  • NR may support half-duplex operation using time division duplexing (TDD) .
  • OFDM and single-carrier frequency division multiplexing (SC-FDM) partition the system bandwidth into multiple orthogonal subcarriers, which are also commonly referred to as tones, bins, etc. Each subcarrier may be modulated with data. Modulation symbols may be sent in the frequency domain with OFDM and in the time domain with SC-FDM.
  • the spacing between adjacent subcarriers may be fixed, and the total number of subcarriers may be dependent on the system bandwidth.
  • the minimum resource allocation may be 12 consecutive subcarriers.
  • the system bandwidth may also be partitioned into subbands. For example, a subband may cover multiple RBs.
  • NR may support a base subcarrier spacing (SCS) of 15 KHz and other SCS may be defined with respect to the base SCS (e.g., 30 kHz, 60 kHz, 120 kHz, 240 kHz, etc.) .
  • SCS base subcarrier spacing
  • FIG. 3 is a diagram showing an example of a frame format 300 for NR.
  • the transmission timeline for each of the downlink and uplink may be partitioned into units of radio frames.
  • Each radio frame may have a predetermined duration (e.g., 10 ms) and may be partitioned into 10 subframes, each of 1 ms, with indices of 0 through 9.
  • Each subframe may include a variable number of slots (e.g., 1, 2, 4, 8, 16, ... slots) depending on the SCS.
  • Each slot may include a variable number of symbol periods (e.g., 7, 12, or 14 symbols) depending on the SCS.
  • the symbol periods in each slot may be assigned indices.
  • a mini-slot which may be referred to as a sub-slot structure, refers to a transmit time interval having a duration less than a slot (e.g., 2, 3, or 4 symbols) .
  • Each symbol in a slot may indicate a link direction (e.g., DL, UL, or flexible) for data transmission and the link direction for each subframe may be dynamically switched.
  • the link directions may be based on the slot format.
  • Each slot may include DL/UL data as well as DL/UL control information.
  • CSI may refer to channel properties of a communication link.
  • the CSI may represent the combined effects of, for example, scattering, fading, and power decay with distance between a transmitter and receiver.
  • the UE may perform channel estimation using pilots, such as CSI-RS, to determine these effects on the channel.
  • the BS may use CSI feedback to adapt transmissions based on the current channel conditions, which is useful for achieving reliable communication, in particular, with high data rates in multi-antenna systems.
  • FIG. 4A and FIG. 4B illustrate example Type-I and Type-II CSI feedback, respectively.
  • the BS 410 e.g., such as the BS 110a
  • may configure the UE 420 e.g., such as the UE 120a
  • the BS 410 may provide the CSI report configuration to the UE 420 via higher layer signaling, such as radio resource control (RRC) signaling (e.g., via a CSI-ReportConfig information element (IE) ) .
  • RRC radio resource control
  • IE CSI-ReportConfig information element
  • the CSI report configuration may configure the time and frequency resources used by the UE 420 to report CSI.
  • the CSI report configuration may be associated with CSI-RS resources for channel measurement (CM) , interference measurement (IM) , or both.
  • the CSI report configuration configures CSI-RS resources for measurement (e.g., via a CSI-ResourceConfig IE) .
  • the CSI-RS resources provide the UE 420 with the configuration of CSI-RS ports, or CSI-RS port groups, mapped to time and frequency resources (e.g., resource elements (REs) ) .
  • CSI-RS resources can be zero power (ZP) or non-zero power (NZP) resources. At least one NZP CSI-RS resource may be configured for CM.
  • the CSI report configuration may configure the UE 120a for aperiodic, periodic, or semi-persistent CSI reporting.
  • the UE may be configured with periodic CSI-RS resources.
  • Periodic CSI and semi-persistent CSI report on physical uplink control channel (PUCCH) may be triggered via RRC or a medium access control (MAC) control element (CE) .
  • PUCCH physical uplink control channel
  • MAC medium access control
  • CE medium access control element
  • the BS 410 may signal the UE a CSI report trigger indicating for the UE 420 to send a CSI report for one or more CSI-RS resources, or configuring the CSI-RS report trigger state (e.g., CSI-AperiodicTriggerStateList and CSI-SemiPersistentOnPUSCH-TriggerStateList) .
  • the CSI report trigger for aperiodic CSI and semi-persistent CSI on PUSCH may be provided via downlink control information (DCI) .
  • DCI downlink control information
  • the CSI-RS trigger may be signaling indicating to the UE that CSI-RS will be transmitted for the CSI-RS resource.
  • the UE 420 may report the CSI feedback based on the CSI report configuration and the CSI report trigger. For example, the UE 420 may measure the channel associated with CSI for the triggered CSI-RS resources. Based on the measurements, the UE 420 may select a preferred CSI-RS resource. The UE 420 reports the CSI feedback for the selected CSI-RS resource.
  • the CSI report configuration also configures the CSI parameters (sometimes referred to as quantities) to be reported.
  • Three codebooks may include Type I single panel, Type I multi-panel, and Type II single panel. Regardless which codebook is used, the CSI report may include at least the channel quality indicator (CQI) , precoding matrix indicator (PMI) , CSI-RS resource indicator (CRI) , and rank indicator (RI) .
  • CQI channel quality indicator
  • PMI precoding matrix indicator
  • CRI CSI-RS resource indicator
  • RI rank indicator
  • the structure of the PMI may vary based on the codebook.
  • the CRI, RI, and CQI may be in a first part (Part I) and the PMI may be in a second part (Part II) of the CSI report.
  • the PMI may include a W1 matrix (e.g., subest of beams) and a W2 matrix (e.g., phase for cross polarization combination and beam selection) .
  • the PMI further comprises a phase for cross panel combination.
  • FIG. 4A illustrates example oversampled beam for Type 1 CSI feedback, in accordance with certain aspects of the present disclosure.
  • the BS 410 may have a plurality of transmit (TX) beams (e.g., TX beams 411, 412, ..., 417) .
  • TX transmit
  • the UE 420 can feed back to the BS 410 an index of a preferred beam b 1 (e.g., TX beam 214) or beams of the candidate beams.
  • a preferred beam b 1 e.g., TX beam 214
  • the UE 420 may feed back the precoding vector w for the l-th layer:
  • b represents the oversampled beam (e.g., discrete Fourier transform (DFT) beam) , for both polarizations, and is the co-phasing.
  • DFT discrete Fourier transform
  • the PMI is a linear combination of beams; it has a subset of orthogonal beams to be used for linear combination and has per layer, per polarization, amplitude and phase for each beam.
  • the preferred beam can by a combination of beams b 1 and b 2 and associated quantized coefficients c 1 and c 2 (e.g., c 1 b 1 + c 2 b 2 ) , and the UE 420 can feedback the selected beams and the coefficients to the BS 410.
  • the UE 420 may be configured to report at least a Type II precoder across configured frequency domain (FD) units.
  • the UE 420 may report wideband (WB) PMI and/or subband (SB) PMI as configured.
  • WB wideband
  • SB subband
  • the UE 420 may report the precoding vector w for the l-th layer as:
  • the precoder matrix w with the linear combination coefficients for the selected subset of beams (e.g., using spatial compression) for the cross-polarization (e.g., +45/-45) across the configured FD units can also be represented as:
  • N 3 corresponds to the number of frequency units (e.g., subbands, resource blocks (RBs) , etc.) .
  • the precoder matrix W for certain systems is based on the spatial domain compression matrix W 1 matrix and the W 2 matrix for reporting (for cross-polarization) the linear combination coefficients for the selected beams (2L) across the configured FD units.
  • the number of FD units (e.g., subbands) for CSI reporting may be relatively large, leading to large overhead for Type-II CSI feedback.
  • certain systems e.g., Release 16 5G NR systems
  • the CSI reporting overhead may be further reduced by selecting only the dominant coefficients associated with each beam in the transformed domain to feedback Therefore the overall number of coefficients, and thereby the overhead, can be reduced.
  • the matrix consists of the linear combination coefficients (amplitude and co-phasing) .
  • the matrix is composed of the basis vectors (each row is a basis vector) used to perform the compression in the frequency domain.
  • the basis vectors in W f are derived from a certain number of columns in a DFT matrix.
  • the precoder matrix may be given by:
  • the dimension of the compressed domain is M i ⁇ N 3 .
  • the number of non-zero coefficients for each may be smaller than M.
  • the precoder matrix feedback with FD compression may be done for multiple layers.
  • the UE may report the CSI in uplink control information (UCI) .
  • the CSI is reported in a two-part UCI.
  • FIG. 7A illustrates example first part UCI 700A for a CSI report.
  • the first part UCI 700A may be of fixed length.
  • the UE may transmit RI, CQI, number of non-zero coefficients (#NZC) , a number of FD basis, a size of an intermediate FD set (N 3 ⁇ ⁇ N 3 ) , a size (N b ) of a bitmap used to indicate coefficient selection, and/or a beam sufficiency indicator (BSI) .
  • the CQI may be calculated based on the RI.
  • the number of NZC may be indicated per layer (e.g., #NZC #1, #NZC #2, ..., etc.) .
  • the number of NZC may indicate the total number of NZC across all layers.
  • the number of FD basis M’ may be less than the M configured FD basis (M ⁇ ⁇ M) .
  • the indication of size of an intermediate FD set may determine a bitwidth of the FD basis selection.
  • the BSI could also be indicated via a value (e.g., 0) of the #NZC.
  • the BSI may indicate whether a configured p or ⁇ parameter is sufficient.
  • FIG. 7B illustrates example part two UCI 700B for a CSI report, in accordance with certain aspects of the present disclosure.
  • the part two UCI may be dynamic.
  • the UE may transmit for the supported layers (e.g., layers 0 to RI-1) the SD beam selection, FD basis selection, coefficient selection, strongest coefficient indication (SCI) , and/or coefficient quantization.
  • the SD beam selection may indicate the selected beams (e.g., the subset of 2L beams) .
  • the UE may report a subset of selected basis of the matrix.
  • the FD basis selection may indicate the selected frequency domain basis (e.g., used for each beam, tap) .
  • the FD basis selection may be reported individually for each layer (e.g., via a bitmap or combination number) .
  • the FD basis selection is reported via a two-stage report.
  • the first stage may report/configure an intermediate (e.g. union) set for all layers and the second stage may report each layer individually from the set reported in the first stage.
  • the coefficient selection may be reported via a bitmap (e.g., a 2LM size bitmap) .
  • the coefficient selection may be reported via two-steps, with the bitwidth depending on the N b .
  • the SCI may depend on the NNZC and configured K 0 .
  • the SCI may be based on the NNZC for a layer i (e.g., ) , based on the maximum NNZC for a layer i (e.g., log 2 K 0 ) , or based on a total NNZC for a layer i (e.g.,
  • the CSI report configuration configures the UE to report a maximum number of coefficients per rank, K 0 .
  • UE can select the subset K 0 ⁇ 2LM of the linear combination coefficients of the matrix for reporting.
  • the UE may not have sufficient resources for reporting the configured K 0 number of coefficients per rank.
  • the UE may be allocated PUSCH resources for the CSI reporting. Based on the amount of PUSCH resources allocated and the resources used for reporting the first part UCI, the remaining resources for reporting the configured K 0 number of coefficients per rank dynamic second UCI.
  • the UE omits reporting of some of the CSI. For example, the UE may omit some even/odd subbands for reporting (e.g., according to configured CSI priority/omission rules) . In some cases, the UE computes the CSI report using the configured K 0 number of coefficients per rank, but then omits (e.g., drops/does not report) some the coefficients from the CSI report, which may be an inefficient use of resources.
  • CSI reporting techniques described may allow reduced CSI overhead reduction and can avoid CSI omission, which may provide improved resource usage efficiency, such as for Type-II frequency domain (FD) compressed CSI reporting.
  • a user equipment (UE) can determine an actual number linear combination coefficients to report per layer (or per rank) based on a supported payload size for uplink control information (UCI) , a supported number of linear combination coefficients per rank for CSI reporting (K r ) , and the configured number of linear combination coefficients to report per rank (K 0 ) .
  • UCI uplink control information
  • K r supported number of linear combination coefficients per rank for CSI reporting
  • K 0 the configured number of linear combination coefficients to report per rank
  • FIG. 10 is a flow diagram illustrating example operations 1000 for wireless communication, in accordance with certain aspects of the present disclosure.
  • the operations 1000 may be performed, for example, by UE (e.g., such as a UE 120a in the wireless communication network 100) .
  • Operations 1000 may be implemented as software components that are executed and run on one or more processors (e.g., controller/processor 280 of FIG. 2) .
  • the transmission and reception of signals by the UE in operations 1000 may be enabled, for example, by one or more antennas (e.g., antennas 252 of FIG. 2) .
  • the transmission and/or reception of signals by the UE may be implemented via a bus interface of one or more processors (e.g., controller/processor 1480) obtaining and/or outputting signals.
  • the operations 1000 may begin, at 1005, by receiving a CSI report configuration, configuring the UE for reporting frequency domain compressed precoding matrix information including, for each layer, and for one or more selected beams, a configured number of linear combination coefficients to report per rank (K 0 ) .
  • K 0 may be a predefined value.
  • the K 0 may be configured via radio resource control (RRC) signaling or dynamically via downlink control information (DCI) .
  • RRC radio resource control
  • DCI downlink control information
  • the CSI report configuration may also configure the UE with the CSI resources for reporting, with one or more CSI report triggers, with the CSI report quantities, and the like.
  • the CSI report configuration configures the UE for reporting Type-II frequency domain precoding matrix feedback per layer, per selected beam, for example as described above with respect to FIGs. 4-9.
  • the CSI report configuration configures the UE for reporting one or more of the quantities described above for the two-part UCI in FIG. 7A and FIG. 7B.
  • the UE determines an actual number of linear combination coefficients to report per rank based, at least in part, on the configured number of linear combination coefficients to report per rank (K 0 ) and a computed number of supported linear combination coefficients per rank (K r ) .
  • the determining the actual number of linear combination coefficients to report per rank includes computing a supported payload size (P max ) for the part 2 of the UCI (e.g., a maximum payload size) , computing the supported number (e.g., a maximum number) of coefficients per rank the UE can report (K r ) based on the P max , and determining the actual number of linear combination coefficients to report per rank based on a comparison of the computed K r and the configured K 0 .
  • P max supported payload size
  • K r the supported number of coefficients per rank the UE can report
  • the UE computes the supported payload size (P max ) for the part two of the UCI based on a resource allocation for the part two of the UCI and a configured coding rate.
  • the resource allocation may allocate physical uplink shared channel (PUSCH) resources for the CSI reporting.
  • the resource allocation may be indicated dynamically via DCI.
  • the configured coding rate is a coding rate configured for the PUSCH.
  • the coding rate may be configured by upper layer signaling, such as RRC signaling.
  • the UE determines the computed the supported number of linear combination coefficients per rank the UE can report (K r ) based on the P max .
  • the UE may determine K r based on P max and a number of bits for reporting other parameters in the second part UCI.
  • the UE may compute K r as a quotient of a difference of P max and the number of bits for reporting the other parameters in the second part UCI and a quantization of the linear combination coefficients.
  • the other parameters may include a number of beams selected for the CSI report, a number of frequency domain (FD) basis selected for the FD compression, a number of linear combination coefficients selected for the CSI report, a number of strongest linear combination coefficient indicators, and/or a quantization of the linear combination coefficients.
  • FD frequency domain
  • N SCI may be determined based on the rank and K o .
  • the N SCI may be enforced to a value for computation and payload assignment.
  • the K r may be determined progressively (e.g., iteratively) .
  • the left side of the equation may be monotonically increased to obtain the actual K 1 value in a limited number of iterations.
  • the SD beam selection indicates L beams out of N 1 N 2 O 1 O 2 total beams
  • N 1 is the number of spatial domain bases
  • N 2 is the number of ports
  • O 1 and O 2 are the oversampling rates on the N 1 and N 2 antennas.
  • RI is the rank indicator
  • N 3 is the number of frequency units for the CSI reporting
  • M RI is the number of FD bases for a given RI.
  • RI 1, where is the total number of NZC, and if RI > 1.
  • N CS 2LM ⁇ RI.
  • the UE may determine the largest that satisfies N SD +N FD +N SCI +N CS +N Q ⁇ P max .
  • the determining, at 1010, the actual number of linear combination coefficients per rank is based on a comparison of K 0 and K r .
  • the UE may determine the actual number of linear combination coefficients to report, per layer, as a smaller of K 0 and a first computed number of supported linear combination coefficients per rank (e.g., min (K 1 , K 0 ) ) .
  • the UE may determine the actual number of linear combination coefficients to report, per layer, as a smaller of K 0 and one-half a second number of supported linear combination coefficients per rank (e.g., min( (K 2 /2) , K 0 ) ) .
  • the UE may determine the actual number of linear combination coefficients to report across all layers as a smaller of twice K 0 and a computed third number of supported linear combination coefficients per rank (e.g., min (K 3 , 2K 0 ) .
  • the UE may determine the actual number of linear combination coefficients to report across all layers as a smaller of twice K 0 and a computed fourth number of supported linear combination coefficients per rank (e.g., min (K 4 , 2K 0 ) .
  • the UE sends a CSI report based on the actual number of linear combination coefficients to report per rank. For example, the UE may compute the CSI report based on the determined actual number of linear combination coefficients to report per rank and send the CSI report with all of the actual number of linear combination coefficients to report per rank (e.g., without any CSI omission) . In some examples, the CSI report is sent as a two-part UCI.
  • the UE may be configured to report a plurality of CSI reports.
  • the CSI may be computed in serial.
  • the UE may determine a priority order of the plurality of CSI reports.
  • the UE may determine available payload of the second part of the UCI for lower priority CSI reports as a difference of the supported payload size and a payload size of higher priority CSI reports.
  • the payload for a first CSI report (e.g., a higher priority CSI report) may be computed as P 1
  • the UE can use the P 2 to determine the number of coefficients for the second CSI report and calculate and report the second CSI report accordingly.
  • the UE determines whether the allocated resources (e.g., the allocated PUSCH resources) are sufficient or insufficient to report the configured number of coefficients per rank (K 0 ) . For example, the UE may determine whether the reported number of linear combination coefficients is smaller than K r . Based on the determination, the UE may send an indication to the BS of whether the reported number of linear combination coefficients is smaller than K r . The UE may send the indication via a 1-bit indication. The UE may send the indication in a first part of the UCI (e.g., an explicit indication) .
  • the allocated resources e.g., the allocated PUSCH resources
  • K 0 the configured number of coefficients per rank
  • the UE may provide the indication (e.g., implicitly) via a CSI report parameter value that is not supported (e.g., a forbidden or non-supported CSI feedback report quantity) .
  • a CSI report parameter value that is not supported (e.g., a forbidden or non-supported CSI feedback report quantity) .
  • the UE may report a CQI report that is not associated with the precoding matrix information (e.g., the BS is not assumed to transmit a modulation coding scheme (MSC) with targeting block error rate (BLER) requirement with the UE reported CQI and PMI) .
  • MSC modulation coding scheme
  • BLER block error rate
  • the UE may report a CQI that is associated with the precoding matrix information
  • FIG. 11 is a flow diagram illustrating example operations 1100 for wireless communication, in accordance with certain aspects of the present disclosure.
  • the operations 1100 may be performed, for example, by a BS (e.g., such as a BS 110a in the wireless communication network 100) .
  • the operations 1100 may be complimentary operations by the BS 110a to the operations 1000 performed by the UE 120a.
  • Operations 1100 may be implemented as software components that are executed and run on one or more processors (e.g., controller/processor 240 of FIG. 2) .
  • the transmission and reception of signals by the BS in operations 1100 may be enabled, for example, by one or more antennas (e.g., antennas 234 of FIG. 2) .
  • the transmission and/or reception of signals by the BS may be implemented via a bus interface of one or more processors (e.g., controller/processor 240) obtaining and/or outputting signals.
  • the operations 1100 may begin, at 1105, by sending a UE (e.g., UE 120a) a CSI report configuration.
  • the CSI report configuration may configure the UE for reporting frequency domain compressed precoding matrix information including, for each layer, and for one or more selected beams, a configured number of linear combination coefficients to report per rank (K 0 ) .
  • the BS determines an actual number of linear combination coefficients per rank the UE reports based, at least in part, on the configured number of linear combination coefficients to report per rank and a computed number of linear combination coefficients per rank the UE supports for CSI reporting.
  • the BS may determine the actual number of linear combination coefficients per rank the UE reports as described above for the UE operations. For example, the BS may determine the actual number of linear combination coefficients per rank based on a comparison K 0 and K r .
  • the BS may determine K r based on a resource allocation sent to the UE and report quantities configured in the CSI report configuration sent to the UE.
  • the BS processes a CSI report from the UE based on the determined actual number of linear combination coefficients per rank the UE reports. For example, the BS is not expected to receive a CSI report with K total or per layer K larger than the calculated K r or K r, l .
  • the processing the CSI report, at 1115, based on the determined actual number of linear combination coefficients to report per rank may include treating the CSI report as an invalid report when the CSI report has a greater number of linear combination coefficients than the determined actual number of linear combination coefficients per rank the UE supports for CSI reporting.
  • the BS receives an indication from the UE of whether the reported number of linear combination coefficients is smaller than the computed number of linear combination coefficients.
  • the indication may be received via a 1-bit indication in a first part of the UCI or indicated via a CSI report parameter value that is not supported.
  • the BS may process the CSI report further based on the indication.
  • the methods disclosed herein comprise one or more steps or actions for achieving the methods.
  • the method steps and/or actions may be interchanged with one another without departing from the scope of the claims.
  • the order and/or use of specific steps and/or actions may be modified without departing from the scope of the claims.
  • FIG. 12 illustrates a communications device 1200 that may include various components (e.g., corresponding to means-plus-function components) configured to perform operations for the techniques disclosed herein type-II frequency domain compressed CSI reporting with reduced overhead, such as the operations illustrated in FIG. 10.
  • the communications device 1200 includes a processing system 1202 coupled to a transceiver 1208.
  • the transceiver 1208 is configured to transmit and receive signals for the communications device 1200 via an antenna 1210, such as the various signals as described herein.
  • the processing system 1202 may be configured to perform processing functions for the communications device 1200, including processing signals received and/or to be transmitted by the communications device 1200.
  • the processing system 1202 includes a processor 1204 coupled to a computer-readable medium/memory 1212 via a bus 1206.
  • the computer-readable medium/memory 1212 is configured to store instructions (e.g., computer-executable code) that when executed by the processor 1204, cause the processor 1204 to perform the operations illustrated in FIG. 10, or other operations for performing the various techniques discussed herein for type-II frequency domain compressed CSI reporting with reduced overhead.
  • computer-readable medium/memory 1212 stores code 1214 for receiving a CSI report configuration, for example, configuring the UE for reporting frequency domain compressed precoding matrix information including, for each layer, and for one or more selected beams, a configured number of linear combination coefficients to report per rank, in accordance with certain aspects of the present disclosure; code 1216 for determining an actual number of linear combination coefficients to report per rank, for example, based, at least in part, on the configured number of linear combination coefficients to report per rank and a computed number of supported linear combination coefficients per rank, in accordance with certain aspects of the present disclosure; and/or code 1218 for sending a CSI report based on the actual number of linear combination coefficients to report per rank.
  • the processor 1204 has circuitry configured to implement the code stored in the computer-readable medium/memory 1212.
  • the processor 1204 includes circuitry 1220 for receiving a CSI report configuration; circuitry 1222 for determining an actual number of linear combination coefficients to report per rank; and/or circuitry 1224 for sending a CSI report based on the actual number of linear combination coefficients to report per rank.
  • FIG. 13 illustrates a communications device 1300 that may include various components (e.g., corresponding to means-plus-function components) configured to perform operations for the techniques disclosed herein type-II frequency domain compressed CSI reporting with reduced overhead, such as the operations illustrated in FIG. 11.
  • the communications device 1300 includes a processing system 1302 coupled to a transceiver 1308.
  • the transceiver 1308 is configured to transmit and receive signals for the communications device 1300 via an antenna 1310, such as the various signals as described herein.
  • the processing system 1302 may be configured to perform processing functions for the communications device 1300, including processing signals received and/or to be transmitted by the communications device 1300.
  • the processing system 1302 includes a processor 1304 coupled to a computer-readable medium/memory 1312 via a bus 1306.
  • the computer-readable medium/memory 1312 is configured to store instructions (e.g., computer-executable code) that when executed by the processor 1304, cause the processor 1304 to perform the operations illustrated in FIG. 11, or other operations for performing the various techniques discussed herein for type-II frequency domain compressed CSI reporting with reduced overhead.
  • computer-readable medium/memory 1312 stores code 1314 for receiving a CSI report configuration, for example, configuring the UE for reporting frequency domain compressed precoding matrix information including, for each layer, and for one or more selected beams, a configured number of linear combination coefficients to report per rank, in accordance with certain aspects of the present disclosure; code 1316 for determining an actual number of linear combination coefficients per rank the UE reports, for example, based, at least in part, on the configured number of linear combination coefficients to report per rank and a computed number of linear combination coefficients per rank supported by the UE for CSI reporting, in accordance with certain aspects of the present disclosure; and/or code 1318 for processing a CSI report from the UE based on the determined actual number of linear combination coefficients the UE reports per rank.
  • the processor 1304 has circuitry configured to implement the code stored in the computer-readable medium/memory 1312.
  • the processor 1304 includes circuitry 1320 for sending a CSI report configuration to a UE;circuitry 1322 for determining an actual number of linear combination coefficients the UE reports per rank; and/or circuitry 1324 for processing a CSI report from the UE based on the determined actual number of linear combination coefficients per rank the UE reports.
  • a method for wireless communication by a user equipment includes receiving a channel state information (CSI) report configuration, configuring the UE for reporting frequency domain compressed precoding matrix information including, for each layer, and for one or more selected beams, a configured number of linear combination coefficients to report per rank.
  • the UE determines an actual number of linear combination coefficients to report per rank based, at least in part, on the configured number of linear combination coefficients to report per rank and a computed number of supported linear combination coefficients per rank.
  • the UE sends a CSI report based on the actual number of linear combination coefficients to report per rank.
  • sending the CSI report based on the actual number of linear combination coefficients to report per rank includes computing CSI based on the determined actual number of linear combination coefficients to report per rank and sending the CSI report with all of the actual number of linear combination coefficients to report per rank.
  • determining the actual number of linear combination coefficients per rank is based on a comparison of the configured number of linear combination coefficients and the computed number of supported linear combination coefficients per rank.
  • determining the actual number of linear combination coefficients per rank includes for rank 1, determining the actual number of linear combination coefficients to report, per layer, as a smaller of the configured number of linear combination coefficients and a first computed number of supported linear combination coefficients per rank; for rank 2, determining the actual number of linear combination coefficients to report, per layer, as a smaller of the configured number of linear combination coefficients and one-half a second number of supported linear combination coefficients per rank; for rank 3, determining the actual number of linear combination coefficients to report across all layers as a smaller of twice the configured number of linear combination coefficients and a computed third number of supported linear combination coefficients per rank; and/or for rank 4, determining the actual number of linear combination coefficients to report across all layers as a smaller of twice the configured number of linear combination coefficients and a computed number of supported linear combination coefficients per rank.
  • the CSI report is sent in a two-part uplink control information (UCI) ; and determining the computed number of supported linear combination coefficients per rank is based on a supported payload size for the second part of the UCI and a number of bits for reporting other parameters in the second part UCI.
  • UCI uplink control information
  • the other parameters in the second part of the UCI includes a number of beams selected for the CSI report; a number of frequency domain basis selected for the frequency domain compression; a number of coefficients selected for the CSI report; a number of strongest coefficient indicators; and/or a quantization of the linear combination coefficients.
  • the UE determines the number of strongest coefficient indicators based on the rank and the configured number of linear combination coefficients per rank.
  • the number of supported linear combination coefficients per rank is computed as a quotient of a difference of the supported payload size for the second part of the UCI and the number of bits for reporting the other parameters in the second part UCI and a quantization of the linear combination coefficients.
  • the number of supported linear combination coefficients per rank is computed iteratively.
  • the UE is configured to report a plurality of CSI reports and the UE: determines a priority order of the plurality of CSI reports; and determines available payload of the second part of the UCI for lower priority CSI reports as a difference of the supported payload size and a payload size of higher priority CSI reports.
  • the UE in combination with one or more of the first through tenth aspects, sends an indication to the BS of whether the reported number of linear combination coefficients is smaller than the computed number of linear combination coefficients.
  • the indication is sent via a 1-bit indication in a first part of the UCI or via a CSI report parameter value that is not supported.
  • sending the CSI report comprises sending a channel quality indicator (CQI) report that is not associated with the precoding matrix information when the configured number of linear combination coefficients to report per rank is greater than the maximum supported payload size.
  • CQI channel quality indicator
  • a method for wireless communication by a base station includes sending a user equipment (UE) a channel state information (CSI) report configuration, configuring the UE for reporting frequency domain compressed precoding matrix information including, for each layer, and for one or more selected beams, a configured number of linear combination coefficients to report per rank.
  • the BS determines an actual number of linear combination coefficients per rank the UE reports based, at least in part, on the configured number of linear combination coefficients to report per rank and a computed number of linear combination coefficients per rank the UE supports for CSI reporting.
  • the BS processes a CSI report from the UE based on the determined actual number of linear combination coefficients per rank the UE reports.
  • processing the CSI report based on the actual number of linear combination coefficients to report per rank includes treating the CSI report as an invalid report when the CSI report includes a greater number of linear combination coefficients than the determined actual number of linear combination coefficients.
  • determining the actual number of linear combination coefficients per rank is based on a comparison of the configured number of linear combination coefficients and the computed number of supported linear combination coefficients per rank.
  • determining the actual number of linear combination coefficients per rank includes for rank 1, determining the actual number of linear combination coefficients to report, per layer, as a smaller of the configured number of linear combination coefficients and a first computed number of supported linear combination coefficients per rank; for rank 2, determining the actual number of linear combination coefficients to report, per layer, as a smaller of the configured number of linear combination coefficients and one-half a second number of supported linear combination coefficients per rank; for rank 3, determining the actual number of linear combination coefficients to report across all layers as a smaller of twice the configured number of linear combination coefficients and a computed third number of supported linear combination coefficients per rank; and/or for rank 4, determining the actual number of linear combination coefficients to report across all layers as a smaller of twice the configured number of linear combination coefficients and a computed number of supported linear combination coefficients per rank.
  • the CSI report is received in a two-part uplink control information (UCI) ; and determining the computed number of supported linear combination coefficients per rank is based on a supported payload size configured for the second part of the UCI and a number of bits for reporting other configured parameters in the second part UCI.
  • UCI uplink control information
  • the other parameters in the second part of the UCI includes a number of beams selected for the CSI report; a number of frequency domain basis selected for the frequency domain compression; a number of coefficients selected for the CSI report; a number of strongest coefficient indicators; and/or a quantization of the linear combination coefficients.
  • the BS determines the number of strongest coefficient indicators based on the rank and the configured number of linear combination coefficients per rank.
  • the number of supported linear combination coefficients per rank is computed as a quotient of a difference of the supported payload size for the second part of the UCI and the number of bits for reporting the other parameters in the second part UCI and a quantization of the linear combination coefficients.
  • the number of supported linear combination coefficients per rank is computed iteratively.
  • the BS receives an indication from the UE of whether the reported number of linear combination coefficients is smaller than the computed number of linear combination coefficients.
  • the indication is received via a 1-bit indication in a first part of the UCI or via a CSI report parameter value that is not supported.
  • NR e.g., 5G NR
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single-carrier frequency division multiple access
  • TD-SCDMA time division synchronous code division multiple access
  • a CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (UTRA) , cdma2000, etc.
  • UTRA Universal Terrestrial Radio Access
  • UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA.
  • cdma2000 covers IS-2000, IS-95 and IS-856 standards.
  • a TDMA network may implement a radio technology such as Global System for Mobile Communications (GSM) .
  • GSM Global System for Mobile Communications
  • An OFDMA network may implement a radio technology such as NR (e.g. 5G RA) , Evolved UTRA (E-UTRA) , Ultra Mobile Broadband (UMB) , IEEE 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash-OFDMA, etc.
  • NR e.g. 5G RA
  • E-UTRA Evolved UTRA
  • UMB Ultra Mobile Broadband
  • IEEE 802.11 Wi-Fi
  • IEEE 802.16 WiMAX
  • IEEE 802.20 Flash-OFDMA
  • UTRA and E-UTRA are part of Universal Mobile Telecommunication System (UMTS) .
  • LTE and LTE-A are releases of UMTS that use E-UTRA.
  • UTRA, E-UTRA, UMTS, LTE, LTE-A and GSM are described in documents from an organization named “3rd Generation Partnership Project” (3GPP) .
  • cdma2000 and UMB are described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2) .
  • NR is an emerging wireless communications technology under development.
  • the term “cell” can refer to a coverage area of a Node B (NB) and/or a NB subsystem serving this coverage area, depending on the context in which the term is used.
  • NB Node B
  • BS next generation NodeB
  • AP access point
  • DU distributed unit
  • TRP transmission reception point
  • a BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and/or other types of cells.
  • a macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscription.
  • a pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription.
  • a femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs having an association with the femto cell (e.g., UEs in a Closed Subscriber Group (CSG) , UEs for users in the home, etc.) .
  • a BS for a macro cell may be referred to as a macro BS.
  • a BS for a pico cell may be referred to as a pico BS.
  • a BS for a femto cell may be referred to as a femto BS or a home BS.
  • a UE may also be referred to as a mobile station, a terminal, an access terminal, a subscriber unit, a station, a Customer Premises Equipment (CPE) , a cellular phone, a smart phone, a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, an appliance, a medical device or medical equipment, a biometric sensor/device, a wearable device such as a smart watch, smart clothing, smart glasses, a smart wrist band, smart jewelry (e.g., a smart ring, a smart bracelet, etc.) , an entertainment device (e.g., a music device, a video device, a satellite radio, etc.) , a vehicular component or sensor, a smart meter/sensor, industrial manufacturing equipment, a
  • Some UEs may be considered machine-type communication (MTC) devices or evolved MTC (eMTC) devices.
  • MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., that may communicate with a BS, another device (e.g., remote device) , or some other entity.
  • a wireless node may provide, for example, connectivity for or to a network (e.g., a wide area network such as Internet or a cellular network) via a wired or wireless communication link.
  • Some UEs may be considered Internet-of-Things (IoT) devices, which may be narrowband IoT (NB-IoT) devices.
  • IoT Internet-of-Things
  • NB-IoT narrowband IoT
  • a scheduling entity (e.g., a BS) allocates resources for communication among some or all devices and equipment within its service area or cell.
  • the scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communication, subordinate entities utilize resources allocated by the scheduling entity.
  • Base stations are not the only entities that may function as a scheduling entity.
  • a UE may function as a scheduling entity and may schedule resources for one or more subordinate entities (e.g., one or more other UEs) , and the other UEs may utilize the resources scheduled by the UE for wireless communication.
  • a UE may function as a scheduling entity in a peer-to-peer (P2P) network, and/or in a mesh network.
  • P2P peer-to-peer
  • UEs may communicate directly with one another in addition to communicating with a scheduling entity.
  • two or more subordinate entities may communicate with each other using sidelink signals.
  • Real-world applications of such sidelink communications may include public safety, proximity services, UE-to-network relaying, vehicle-to-vehicle (V2V) communications, Internet of Everything (IoE) communications, IoT communications, mission-critical mesh, and/or various other suitable applications.
  • a sidelink signal may refer to a signal communicated from one subordinate entity (e.g., UE1) to another subordinate entity (e.g., UE2) without relaying that communication through the scheduling entity (e.g., UE or BS) , even though the scheduling entity may be utilized for scheduling and/or control purposes.
  • the sidelink signals may be communicated using a licensed spectrum (unlike wireless local area networks, which typically use an unlicensed spectrum) .
  • a phrase referring to “at least one of” a list of items refers to any combination of those items, including single members.
  • “at least one of: a, b, or c” is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination with multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c) .
  • determining encompasses a wide variety of actions. For example, “determining” may include calculating, computing, processing, deriving, investigating, looking up (e.g., looking up in a table, a database or another data structure) , ascertaining and the like. Also, “determining” may include receiving (e.g., receiving information) , accessing (e.g., accessing data in a memory) and the like. Also, “determining” may include resolving, selecting, choosing, establishing and the like.
  • a set of one or more base stations may define an eNodeB (eNB) .
  • a wireless multiple access communication system may include a number of distributed units (DUs) (e.g., edge units (EUs) , edge nodes (ENs) , radio heads (RHs) , smart radio heads (SRHs) , transmission reception points (TRPs) , etc.) in communication with a number of central units (CUs) (e.g., central nodes (CNs) , access node controllers (ANCs) , etc.) , where a set of one or more DUs, in communication with a CU, may define an access node (e.g., which may be referred to as a BS, next generation NodeB (gNB or gNodeB) , TRP, etc.) .
  • DUs distributed units
  • EUs edge units
  • ENs edge nodes
  • RHs radio heads
  • RHs smart radio heads
  • TRPs transmission reception
  • a BS or DU may communicate with a set of UEs on downlink channels (e.g., for transmissions from a BS or DU to a UE) and uplink channels (e.g., for transmissions from a UE to a BS or DU) .
  • downlink channels e.g., for transmissions from a BS or DU to a UE
  • uplink channels e.g., for transmissions from a UE to a BS or DU
  • the various operations of methods described above may be performed by any suitable means capable of performing the corresponding functions.
  • the means may include various hardware and/or software component (s) and/or module (s) , including, but not limited to a circuit, an application specific integrated circuit (ASIC) , or processor.
  • ASIC application specific integrated circuit
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • PLD programmable logic device
  • a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any commercially available processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • an example hardware configuration may comprise a processing system in a wireless node.
  • the processing system may be implemented with a bus architecture.
  • the bus may include any number of interconnecting buses and bridges depending on the specific application of the processing system and the overall design constraints.
  • the bus may link together various circuits including a processor, machine-readable media, and a bus interface.
  • the bus interface may be used to connect a network adapter, among other things, to the processing system via the bus.
  • the network adapter may be used to implement the signal processing functions of the PHY layer.
  • a user interface e.g., keypad, display, mouse, joystick, etc.
  • the bus may also link various other circuits such as timing sources, peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further.
  • the processor may be implemented with one or more general-purpose and/or special-purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuitry that can execute software. Those skilled in the art will recognize how best to implement the described functionality for the processing system depending on the particular application and the overall design constraints imposed on the overall system.
  • the functions may be stored or transmitted over as one or more instructions or code on a computer readable medium.
  • Software shall be construed broadly to mean instructions, data, or any combination thereof, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • Computer-readable media include both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • the processor may be responsible for managing the bus and general processing, including the execution of software modules stored on the machine-readable storage media.
  • a computer-readable storage medium may be coupled to a processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor.
  • the machine-readable media may include a transmission line, a carrier wave modulated by data, and/or a computer readable storage medium with instructions stored thereon separate from the wireless node, all of which may be accessed by the processor through the bus interface.
  • the machine-readable media, or any portion thereof may be integrated into the processor, such as the case may be with cache and/or general register files.
  • machine-readable storage media may include, by way of example, RAM (Random Access Memory) , flash memory, ROM (Read Only Memory) , PROM (Programmable Read-Only Memory) , EPROM (Erasable Programmable Read-Only Memory) , EEPROM (Electrically Erasable Programmable Read-Only Memory) , registers, magnetic disks, optical disks, hard drives, or any other suitable storage medium, or any combination thereof.
  • RAM Random Access Memory
  • ROM Read Only Memory
  • PROM Programmable Read-Only Memory
  • EPROM Erasable Programmable Read-Only Memory
  • EEPROM Electrical Erasable Programmable Read-Only Memory
  • registers magnetic disks, optical disks, hard drives, or any other suitable storage medium, or any combination thereof.
  • the machine-readable media may be embodied in a computer-program product.
  • a software module may comprise a single instruction, or many instructions, and may be distributed over several different code segments, among different programs, and across multiple storage media.
  • the computer-readable media may comprise a number of software modules.
  • the software modules include instructions that, when executed by an apparatus such as a processor, cause the processing system to perform various functions.
  • the software modules may include a transmission module and a receiving module. Each software module may reside in a single storage device or be distributed across multiple storage devices.
  • a software module may be loaded into RAM from a hard drive when a triggering event occurs.
  • the processor may load some of the instructions into cache to increase access speed.
  • One or more cache lines may then be loaded into a general register file for execution by the processor.
  • any connection is properly termed a computer-readable medium.
  • the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared (IR) , radio, and microwave
  • the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium.
  • Disk and disc include compact disc (CD) , laser disc, optical disc, digital versatile disc (DVD) , floppy disk, and disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers.
  • computer-readable media may comprise non-transitory computer-readable media (e.g., tangible media) .
  • computer-readable media may comprise transitory computer-readable media (e.g., a signal) . Combinations of the above should also be included within the scope of computer-readable media.
  • certain aspects may comprise a computer program product for performing the operations presented herein.
  • a computer program product may comprise a computer-readable medium having instructions stored (and/or encoded) thereon, the instructions being executable by one or more processors to perform the operations described herein, for example, instructions for performing the operations described herein and illustrated in FIG. 10 and/or FIG. 11.
  • modules and/or other appropriate means for performing the methods and techniques described herein can be downloaded and/or otherwise obtained by a user terminal and/or base station as applicable.
  • a user terminal and/or base station can be coupled to a server to facilitate the transfer of means for performing the methods described herein.
  • various methods described herein can be provided via storage means (e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or floppy disk, etc.) , such that a user terminal and/or base station can obtain the various methods upon coupling or providing the storage means to the device.
  • storage means e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or floppy disk, etc.
  • CD compact disc
  • floppy disk etc.
  • any other suitable technique for providing the methods and techniques described herein to a device can be utilized.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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  • Mathematical Physics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Certains aspects de la présente invention concernent des techniques de création de rapport d'informations d'état du canal (CSI) avec un surdébit réduit qui évite l'omission de CSI. Un procédé qui peut être réalisé par un équipement utilisateur (UE) comprend la réception d'une configuration de rapport de CSI. La configuration de rapport de CSI configure l'UE pour qu'il rapporte des informations de matrice de précodage compressées dans le domaine fréquentiel comprenant, pour chaque couche, et pour un ou plusieurs faisceaux sélectionnés, un nombre configuré de coefficients de combinaison linéaire à rapporter par rang. L'UE détermine un nombre réel de coefficients de combinaison linéaire à rapporter par rang sur la base, au moins en partie, du nombre configuré de coefficients de combinaison linéaire à rapporter par rang et d'un nombre calculé de coefficients de combinaison linéaire pris en charge par rang. L'UE envoie un rapport de CSI basé sur le nombre réel de coefficients de combinaison linéaire à rapporter par rang.
PCT/CN2020/088560 2019-05-02 2020-05-02 Détermination de coefficient pour rapport de csi compressé de type ii avec surdébit réduit WO2020221371A1 (fr)

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