WO2021232402A1 - Transfert de csi en liaison latérale - Google Patents

Transfert de csi en liaison latérale Download PDF

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Publication number
WO2021232402A1
WO2021232402A1 PCT/CN2020/091782 CN2020091782W WO2021232402A1 WO 2021232402 A1 WO2021232402 A1 WO 2021232402A1 CN 2020091782 W CN2020091782 W CN 2020091782W WO 2021232402 A1 WO2021232402 A1 WO 2021232402A1
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Prior art keywords
csi
another
channel
sidelink
processor
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Ceased
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PCT/CN2020/091782
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English (en)
Inventor
Hui Guo
Kapil Gulati
Gabi Sarkis
Peter Gaal
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Qualcomm Inc
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Qualcomm Inc
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Priority to PCT/CN2020/091782 priority Critical patent/WO2021232402A1/fr
Publication of WO2021232402A1 publication Critical patent/WO2021232402A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • 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
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • H04B7/06952—Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping
    • H04B7/06954—Sidelink beam training with support from third instance, e.g. the third instance being a base station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0028—Formatting
    • H04L1/0031—Multiple signaling transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for sidelink channel state information (CSI) forwarding.
  • 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. ) .
  • available system resources e.g., bandwidth, transmit power, etc.
  • multiple-access systems examples 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 division multiple access
  • SC-FDMA single-carrier frequency division multiple access
  • TD-SCDMA time division synchronous code division multiple access
  • 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
  • the method generally includes determining channel state information (CSI) for a SL channel between the SL device and another SL device.
  • the method generally includes transmitting the CSI to a base station (BS) .
  • CSI channel state information
  • the method generally includes receiving channel state information (CSI) for a sidelink (SL) channel between a SL device and another SL device.
  • the method generally includes sending a resource allocation to at least one of the SL device or the another SL device based on the CSI.
  • CSI channel state information
  • SL sidelink
  • the apparatus generally includes a processing system configured to determine channel state information (CSI) for a SL channel between the SL device and another SL device.
  • the processing system is configured to transmit the CSI to a base station (BS) .
  • BS base station
  • the apparatus generally includes a processing system configured to receive channel state information (CSI) for a sidelink (SL) channel between a SL device and another SL device.
  • the processing system is configured to send a resource allocation to at least one of the SL device or the another SL device based on the CSI.
  • the apparatus generally includes means for determining channel state information (CSI) for a SL channel between the SL device and another SL device.
  • the apparatus generally includes means for transmitting the CSI to a base station (BS) .
  • CSI channel state information
  • the apparatus generally includes means for receiving channel state information (CSI) for a sidelink (SL) channel between a SL device and another SL device.
  • the apparatus generally includes means for sending a resource allocation to at least one of the SL device or the another SL device based on the CSI.
  • CSI channel state information
  • SL sidelink
  • the non-transitory computer-readable medium generally includes instructions executable to determine channel state information (CSI) for a SL channel between the SL device and another SL device.
  • the non-transitory computer-readable medium generally includes instructions executable to transmit the CSI to a base station (BS) .
  • CSI channel state information
  • BS base station
  • the non-transitory computer-readable medium generally includes instructions executable to receive channel state information (CSI) for a sidelink (SL) channel between a SL device and another SL device.
  • the non-transitory computer-readable medium generally includes instructions executable to send a resource allocation to at least one of the SL device or the another SL device based on the CSI.
  • aspects of the present disclosure provide means for, apparatus, processors, and computer-readable mediums for performing the methods described herein.
  • 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 wireless communication network, in accordance with certain aspects of the present disclosure.
  • FIG. 2 is a block diagram conceptually illustrating a design of an example a 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 and FIG. 4B show diagrammatic representations of example vehicle to everything (V2X) systems, in accordance with certain aspects of the present disclosure.
  • V2X vehicle to everything
  • FIG. 5 is a call flow diagram illustrating example resource allocation for sidelink transmission, in accordance with certain aspects of the present disclosure.
  • FIG. 6 is a call flow diagram illustrating example autonomous resource selection for sidelink transmission, in accordance with certain aspects of the present disclosure.
  • FIG. 7 is a flow diagram illustrating example operations for wireless communication by a sidelink device, in accordance with certain aspects of the present disclosure.
  • FIG. 8 is a call flow diagram illustrating example channel state information (CSI) forwarding by a transmitting sidelink device, in accordance with aspects of the present disclosure.
  • CSI channel state information
  • FIG. 9 is a bit layout of example information to be forwarded by a UE in sidelink, in accordance with aspects of the present disclosure.
  • FIG. 10 is another call flow diagram illustrating example CSI forwarding from a receiving sidelink device, in accordance with 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 forwarding channel state information (CSI) in sidelink communication.
  • certain aspects of the present disclosure provide advantages for resource allocation, such as enabling spatial multiplexing, by forwarding CSI to a base station (BS) .
  • BS base station
  • a BS may have no knowledge of CSI, rank, and/or other sidelink scheduling information, since a transmitting sidelink device may not provide such scheduling information. Consequently, scheduling, by the BS, of SL spatial multiplexing of transmissions may be challenging and prone to interference, as described herein with respect to FIG. 5.
  • CSI may be determined by a sidelink (SL) device for a channel between the SL device and another SL device.
  • the CSI may be transmitted to the BS.
  • the CSI may be forwarded to the BS by a transmitting UE when a receiving UE belongs to another cell.
  • the CSI may be forwarded to the BS by the receiving UE when the receiving UE belongs to the same cell as the transmitting UE.
  • the CSI may be sent by multiple UEs to the transmitting UE.
  • the CSI may be sent via uplink control information (UCI) , medium access control (MAC) control element (CE) , or cellular interface (Uu) .
  • UCI uplink control information
  • MAC medium access control
  • CE control element
  • Uu cellular interface
  • 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.
  • 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.
  • the techniques described herein may be used for various wireless networks and radio technologies. While aspects may be described herein using terminology commonly associated with 3G, 4G, and/or new radio (e.g., 5G NR) wireless technologies, aspects of the present disclosure can be applied in other generation-based communication systems.
  • 3G, 4G, and/or new radio e.g., 5G NR
  • 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., 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 an NR system (e.g., a 5G NR network) .
  • the wireless communication network 100 may be in communication with a core network 132.
  • the core network 132 may be in communication with one or more BSs 110 and/or UEs 120 in the wireless communication network 100 via one or more interfaces.
  • the BSs 110 and UEs 120 may be configured for forwarding sidelink CSI to a BS.
  • the BS 110a includes a resource manager 112 that allocates resources based at least in part on received CSI, in accordance with aspects of the present disclosure.
  • the UEs 120a, 120b, 120c include a resource manager 122a, 122b, and 122c, respectively, that may be configured for forwarding sidelink CSI to a BS (e.g., the BS 110) , in accordance with aspects of the present disclosure.
  • the wireless communication network 100 may include a number of BSs 110a-z (each also individually referred to herein as BS 110 or collectively as BSs 110) and other network entities.
  • a 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 BSs or 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.
  • backhaul interfaces e.g., a direct physical connection, a wireless connection, a virtual network, or the like
  • 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 UEs 120a-y (each also individually referred to herein as UE 120 or collectively as 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 (e.g., 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
  • FIG. 2 illustrates example components of BS 110a and UE 120a (e.g., which could also be a UE 120b or UE 120c) , which may be used to implement aspects of the present disclosure.
  • 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.
  • a medium access control (MAC) -control element (MAC-CE) is a MAC layer communication structure that may be used for control command exchange between wireless nodes.
  • the MAC-CE may be carried in a shared channel such as a physical downlink shared channel (PDSCH) , a physical uplink shared channel (PUSCH) , or a physical sidelink shared channel (PSSCH) .
  • PDSCH physical downlink shared channel
  • PUSCH physical uplink shared channel
  • PSSCH physical sidelink shared channel
  • 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) , PBCH demodulation reference signal (DMRS) , and channel state information reference signal (CSI-RS) .
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • DMRS PBCH demodulation reference signal
  • CSI-RS channel state information reference signal
  • 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.
  • MIMO modulation reference signal
  • 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.
  • a respective output symbol stream e.g., for OFDM, etc.
  • 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.
  • 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.
  • the controller/processor 240 of the BS 110a has a resource manager 241 that allocates resources based on forwarded CSI, according to aspects described herein.
  • the controller/processor 280 of the UE 120a has a resource manager 281 that may be configured for receiver side protection in sidelink, according to aspects described herein.
  • other components of the UE 120a and BS 110a may be used to perform the operations 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.
  • a synchronization signal block is transmitted.
  • SSBs may be transmitted in a burst where each SSB in the burst corresponds to a different beam direction for UE-side beam management (e.g., including beam selection and/or beam refinement) .
  • the SSB includes a PSS, a SSS, and a two symbol PBCH.
  • the SSB can be transmitted in a fixed slot location, such as the symbols 0-3 as shown in FIG. 3.
  • the PSS and SSS may be used by UEs for cell search and acquisition.
  • the PSS may provide half-frame timing, the SS may provide the CP length and frame timing.
  • the PSS and SSS may provide the cell identity.
  • the PBCH carries some basic system information, such as downlink system bandwidth, timing information within radio frame, SS burst set periodicity, system frame number, etc.
  • the SSBs may be organized into SS bursts to support beam sweeping. Further system information such as, remaining minimum system information (RMSI) , system information blocks (SIBs) , other system information (OSI) can be transmitted on a physical downlink shared channel (PDSCH) in certain subframes.
  • the SSB can be transmitted up to sixty-four times, for example, with up to sixty-four different beam directions for mmWave.
  • the multiple transmissions of the SSB are referred to as a SS burst set.
  • SSBs in an SS burst set may be transmitted in the same frequency region, while SSBs in different SS bursts sets can be transmitted at different frequency regions.
  • the communication between the UEs 120 and BSs 110 is referred to as the access link.
  • the access link may be provided via a Uu interface.
  • Communication between devices may be referred as the sidelink.
  • 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., UE 120a) to another subordinate entity (e.g., another UE 120) without relaying that communication through the scheduling entity (e.g., UE 120 or BS 110) , 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 licensed spectrum unlike wireless local area networks, which typically use an unlicensed spectrum
  • PC5 for example, as used in V2V, LTE, and/or NR.
  • Various sidelink channels may be used for sidelink communications, including a physical sidelink discovery channel (PSDCH) , a physical sidelink control channel (PSCCH) , a physical sidelink shared channel (PSSCH) , and a physical sidelink feedback channel (PSFCH) .
  • PSDCH may carry discovery expressions that enable proximal devices to discover each other.
  • the PSCCH may carry control signaling such as sidelink resource configurations and other parameters used for data transmissions, and the PSSCH may carry the data transmissions.
  • the PSFCH may carry feedback such as CSI related to a sidelink channel quality.
  • FIG. 4A and FIG. 4B show diagrammatic representations of example V2X systems, in accordance with some aspects of the present disclosure.
  • the vehicles shown in FIG. 4A and FIG. 4B may communicate via sidelink channels and may perform sidelink CSI reporting as described herein.
  • a first transmission mode shown by way of example in FIG. 4A, involves direct communications (for example, also referred to as sidelink communications) between participants in proximity to one another in a local area.
  • a second transmission mode shown by way of example in FIG. 4B, involves network communications through a network, which may be implemented over a Uu interface (for example, a wireless communication interface between a radio access network (RAN) and a UE) .
  • a Uu interface for example, a wireless communication interface between a radio access network (RAN) and a UE
  • a V2X system 400 (for example, including vehicle to vehicle (V2V) communications) is illustrated with two vehicles 402, 404.
  • the first transmission mode allows for direct communication between different participants in a given geographic location.
  • a vehicle can have a wireless communication link 406 with an individual (V2P) (for example, via a UE) through a PC5 interface. Communications between the vehicles 402 and 404 may also occur through a PC5 interface 408.
  • communication may occur from a vehicle 402 to other highway components (for example, highway component 410) , such as a traffic signal or sign (V2I) through a PC5 interface 412.
  • V2I traffic signal or sign
  • the V2X system 400 may be a self-managed system implemented without assistance from a network entity.
  • a self-managed system may enable improved spectral efficiency, reduced cost, and increased reliability as network service interruptions do not occur during handover operations for moving vehicles.
  • the V2X system may be configured to operate in a licensed or unlicensed spectrum, thus any vehicle with an equipped system may access a common frequency and share information. Such harmonized/common spectrum operations allow for safe and reliable operation.
  • FIG. 4B shows a V2X system 450 for communication between a vehicle 452 and a vehicle 454 through a network entity 456.
  • These network communications may occur through discrete nodes, such as a BS (e.g., the BS 110a) , that sends and receives information to and from (for example, relays information between) vehicles 452, 454.
  • the network communications through vehicle to network (V2N) links 458 and 410 may be used, for example, for long range communications between vehicles, such as for communicating the presence of a car accident a distance ahead along a road or highway.
  • Other types of communications may be sent by the wireless node to vehicles, such as traffic flow conditions, road hazard warnings, environmental/weather reports, and service station availability, among other examples. Such data can be obtained from cloud-based sharing services.
  • Roadside units may be utilized.
  • An RSU may be used for V2I communications.
  • an RSU may act as a forwarding node to extend coverage for a UE.
  • an RSU may be co-located with a BS or may be standalone.
  • RSUs can have different classifications. For example, RSUs can be classified into UE-type RSUs and Micro NodeB-type RSUs.
  • Micro NB-type RSUs have similar functionality as the Macro eNB/gNB. The Micro NB-type RSUs can utilize the Uu interface.
  • UE-type RSUs can be used for meeting tight quality-of-service (QoS) requirements by minimizing collisions and improving reliability.
  • QoS quality-of-service
  • UE-type RSUs may use centralized resource allocation mechanisms to allow for efficient resource utilization.
  • Critical information e.g., such as traffic conditions, weather conditions, congestion statistics, sensor data, etc.
  • UE-type RSUs may be a reliable synchronization source.
  • Certain aspects of the present disclosure generally relate to techniques for CSI forwarding.
  • certain aspects of the present disclosure provide advantages for improved sidelink communication reduce interference on uplink and enable spatial multiplexing.
  • a serving gNB allocates sidelink resources for sidelink transmission.
  • the UE 502 may send a sidelink buffer status report (SL-BSR) at 508 to the serving gNB 506 (e.g., via Uu) .
  • the SL-BSR provides the serving gNB 506 with information about sidelink data volume of logical channel identifiers (LDICs) to each destination ID.
  • LDICs logical channel identifiers
  • the gNB 506 receives the SL-BSR and provides a SL grant, at 510, to the UE 502 allocated resources for sidelink transmission from the transmitting UE 502 to the receiving UE 504.
  • the UE 502 sends a SL transmission (e.g., via PC5) to the UE 504 using the granted resources.
  • the UEs may autonomously select sidelink resources (e.g., time and/or frequency resources) .
  • sidelink resources e.g., time and/or frequency resources
  • a transmitting UE 602 autonomously selects and reserves resources for sidelink transmission.
  • the transmitting UE 602 sends a SL transmission to the receiving UE 604 using the autonomously selected resources (e.g., via PC5) .
  • the gNB may have no knowledge of channel, CSI, modulation and coding scheme (MCS) , and/or rank recommendations for the sidelink.
  • MCS modulation and coding scheme
  • the BS may not be able to perform spatial multiplexing of transmissions.
  • a sidelink device can forward CSI and/or scheduling information, received from another sidelink device, to the serving BS.
  • a sidelink device can determine CSI and provide the CSI directly to the BS.
  • the BS may use the CSI and/or scheduling information for resource allocation.
  • the BS may use the CSI and/or scheduling information for sidelink spatial multiplexing.
  • the BS may use the CSI and/or scheduling information to mitigate interference, for example, in uplink and SL coexistence.
  • FIG. 7 is a flow diagram illustrating example operations 700 for wireless communication, in accordance with certain aspects of the present disclosure.
  • the operations 700 may be performed, for example, by a SL device (e.g., the UE 120a and/or the UE 120b in the wireless communication network 100) .
  • the operations 700 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 apparatus in operations 700 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 apparatus may be implemented via a bus interface of one or more processors (e.g., controller/processor 280) obtaining and/or outputting signals.
  • the operations 700 may begin, at 702, by determining CSI for a SL channel between the SL device and another SL device.
  • the first SL device transmits the CSI to a BS.
  • the serving gNB 110a may receive a SL-BSR at 802 from the UE 120a.
  • the gNB 110a may provide a SL grant at 804 to the UE 120a, allocating resources for transmission to the UE 120c.
  • the SL-BSR and the SL grant may be sent via a cellular interface (e.g., Uu) .
  • the receiving UE 120c may be in a different cell (e.g., inter-cell) than the UE 120a and served the gNB 110b.
  • the UE 120c may receive a SL transmission at 808 from the UE 120a.
  • the SL transmission at 808 from the UE 120a may include sidelink control information (SCI) (e.g., in physical sidelink control channel (PSCCH) with the resource allocation information of the grant from the gNB 110a for SL transmission from the UE 120a to the UE 120c.
  • SCI sidelink control information
  • the SL transmission at 808 may also include data (e.g., in a physical sidelink shared channel (PSSCH) ) .
  • the UE 120c may determine sidelink CSI at 809 based on measurements of the sidelink channel.
  • the UE 120c I to send a CSI report at 810 to the UE 120a.
  • CSI may include channel quality indicator (CQI) feedback, precoder matrix indicator (PMI) feedback, rank indicator (RI) feedback, and/or other feedback.
  • CQI channel quality indicator
  • PMI precoder matrix indicator
  • RI rank indicator
  • the UE 120c sends the CSI report via unicast in a SL medium access control (MAC) control element (CE) .
  • CE medium access control control element
  • the UE 120c sends the CSI report via groupcast.
  • the UE 120a may then forward the sidelink CSI to the gNB 110a at 812.
  • the gNB 110a may forward the sidelink CSI in uplink control information (UCI) on the physical uplink control channel (PUCCH) or physical uplink shared channel (PUSCH) , or in a MAC-CE to the gNB 110a.
  • the UE 120a can send scheduling information, such as a preferred rank, MCS, and/or any other suitable scheduling information along with the CSI to the gNB 110a at 812.
  • the UE may send the CSI and/or scheduling information to the BS with the BSR.
  • the UE 120a may include the destination index (e.g., the destination ID) , a logical channel (or logical channel group) ID, the buffer size, along with additional bits (e.g., 2 bits) to indicate the RI (e.g., for up to 4 layers) , and addition bits (e.g., 4 bits) to indicate the CQI (e.g., wideband CQI for the destination ID) .
  • the message may include additional reserved bits to indicate other scheduling information (e.g., MCS) to the gNB 110a. In certain aspects, forwarding such scheduling information to the gNB 110a may enable possible spatial transmission scheduling by the gNB 110a.
  • the transmitting UE may receive, and forward to the BS, CSI reports from multiple UEs of a certain destination ID.
  • the CSI reports may be sent as part of SL feedback information (e.g., via UCI or MAC-CE) .
  • the UE 120b may be served by the same serving cell (e.g., gNB 110a) as the UE 120a (e.g., intra-cell) .
  • both the UE 120a and 120b are RRC connected with the gNB 110a.
  • the UE 120a may send a SL-BSR at 1008 to the gNB 110a, and receive a SL grant at 1010 from the gNB 110a.
  • both of the SL BSR and the SL grant may be sent over Uu.
  • the UE 120a may send a SL transmission at 1012 to the UE 120c.
  • the SL transmission at 1012 may include cell ID (e.g., the serving gNB 110a) information (e.g., in addition to the SCI and data) .
  • the UE 120b may determine (e.g., measure and/or compute) CSI at 1014 for the sidelink channel with the UE 120a. Because the UE 120b has a connection with the gNB 110a, the UE 120b may forward a sidelink CSI report directly to the gNB 110a at 1018. For example, based on the cell ID in the SL transmission from UE 120a, the UE 120b can detect at 1016 that the UE 120a and UE 120b are served by the cell, and the UE 120b can send the sidelink CSI report to the gNB 110a at 1018 based on the detection.
  • the UE 120b may also include a source ID (e.g., of the UE 120b) and a destination ID (e.g., of the UE 120a) with the CSI report.
  • the UE 120b may send the sidelink CSI report in UCI or MAC-CE.
  • forwarding CSI from the UE 120c may reduce the burden on the UE 120a to forward CSI to the gNB 110a, but may be best applied with specific UCI resource pre-allocation for the UE 120b.
  • the UE 120b may also forward hybrid automatic repeat request (HARQ) information to the gNB 110a.
  • HARQ hybrid automatic repeat request
  • the UE 120a may also indicate MCS (selected/used for the sidelink transmission to the UE 120b) and/or other scheduling information to the gNB 110a via UCI or MAC-CE at 1020.
  • MCS selected/used for the sidelink transmission to the UE 120b
  • other scheduling information to the gNB 110a via UCI or MAC-CE at 1020.
  • the gNB can allocate resources for sidelink transmission. For example, the gNB 110a may schedule time and frequency resources, as well as rank and other scheduling information (e.g., MCS) , for the UE 120a to send a sidelink transmission to the UE 120b.
  • the gNB 110a may use the CSI report and scheduling information to schedule spatial multiplexing to mitigate interference for SL and UL coexistence.
  • the UE 120a may determine the RI and/or CSI of a specific SL transmission.
  • the rank, MCS, and other scheduling information may be determined based on a pass-loss measurement, CSI report received from other UEs (e.g., the UE 120c) , HARQ feedback from other UEs, and/or packet priority from higher layer quality of service (QoS) management.
  • the UE 120a may send the RI, CSI, and/or MCS decisions to the gNB 110a while making the resource allocation request.
  • the information may be sent with the SL BSR via MAC CE.
  • the CSI and/or other scheduling information may be sent via UCI as part of SL feedback information to the gNB 110a.
  • the CSI and/or other scheduling information may be sent only when the RI changes.
  • 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., the BS 110a in the wireless communication network 100) .
  • the operations 1100 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 apparatus in operations 1100 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 wireless node may be implemented via a bus interface of one or more processors (e.g., controller/processor 280) obtaining and/or outputting signals.
  • the operations 1100 may begin, at 1102, by receiving CSI for a SL channel between a SL device and another SL device.
  • the BS sends a resource allocation to at least one of the SL device or the another SL device based on the CSI.
  • 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, such as the operations illustrated in FIG. 7.
  • the communications device 1200 includes a processing system 1202 coupled to a transceiver 1208 (e.g., a transmitter and/or a receiver) .
  • 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. 7, or other operations for performing the various techniques discussed herein for receiver side protection in SL communication.
  • computer-readable medium/memory 1212 stores code 1214 for determining CSI for a SL channel between the SL device and another SL device; and code 1216 for transmitting the CSI to a base station (BS) .
  • BS base station
  • the processor 1204 has circuitry configured to implement the code stored in the computer-readable medium/memory 1212.
  • the processor 1204 includes circuitry 1218 for determining channel state information (CSI) for a SL channel between the SL device and another SL device; and circuitry 1220 for transmitting the CSI to a base station (BS) .
  • CSI channel state information
  • 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, such as the operations illustrated in FIG. 11.
  • the communications device 1300 includes a processing system 1302 coupled to a transceiver 1308 (e.g., a transmitter and/or a receiver) .
  • 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 receiver side protection in SL communication.
  • computer-readable medium/memory 1312 stores code 1314 for receiving channel state information (CSI) for a SL channel between a SL device and another SL device; and code 1316 for sending a resource allocation to at least one of the SL device or the another SL device based on the CSI.
  • CSI channel state information
  • the processor 1304 has circuitry configured to implement the code stored in the computer-readable medium/memory 1312.
  • the processor 1304 includes circuitry 1318 for receiving channel state information (CSI) for a SL channel between a SL device and another SL device; and circuitry 1320 for sending a resource allocation to at least one of the SL device or the another SL device based on the CSI.
  • the processor 1304 has circuitry configured to implement the code stored in the computer-readable medium/memory 1312.
  • 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.
  • CPE Customer Premises Equipment
  • PDA personal digital assistant
  • WLL wireless local loop
  • MTC machine-type communication
  • eMTC evolved MTC
  • 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.
  • a network e.g., a wide area network such as Internet or a cellular network
  • 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.
  • 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.
  • 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.
  • means for transmitting may include a transmitter and/or an antenna (s) 234 of the BS 110 or the transmitter unit 254 and/or antenna (s) 252 of the UE 120 illustrated in FIG. 2.
  • Means for receiving may include a receiver and/or an antenna (s) 234 of the BS 110 or a receiver and/or antenna (s) 252 of the UE 120 illustrated in FIG. 2.
  • Means for communicating may include a transmitter, a receiver or both.
  • Means for generating, means for performing, means for determining, means for taking action, means for determining, means for coordinating may include a processing system, which may include one or more processors, such as the transmit processor 220, the TX MIMO processor 230, the receive processor 238, and/or the controller/processor 240 of the BS 110 or the receive processor 258, the transmit processor 264, the TX MIMO processor 266, and/or the controller/processor 280 of the UE 120 illustrated in FIG. 2.
  • processors such as the transmit processor 220, the TX MIMO processor 230, the receive processor 238, and/or the controller/processor 240 of the BS 110 or the receive processor 258, the transmit processor 264, the TX MIMO processor 266, and/or the controller/processor 280 of the UE 120 illustrated in FIG. 2.
  • 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.
  • 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. 7 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)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Certains aspects de l'invention concernent des techniques de transmission d'informations d'état de canal (CSI) en liaison latérale (SL). Selon certains aspects, un procédé mis en œuvre par un dispositif SL consiste généralement à déterminer des informations d'état de canal (CSI) pour un canal SL entre le dispositif SL et un autre dispositif SL, ainsi qu'à transmettre les CSI à une station de base (BS). Dans certains aspects, un procédé mis en œuvre par une BS consiste généralement à recevoir des CSI pour un canal SL entre un dispositif SL et un autre dispositif SL, ainsi qu'à envoyer une attribution de ressources au dispositif SL et/ou à l'autre dispositif SL d'après les CSI.
PCT/CN2020/091782 2020-05-22 2020-05-22 Transfert de csi en liaison latérale Ceased WO2021232402A1 (fr)

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Citations (4)

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Publication number Priority date Publication date Assignee Title
WO2018056728A1 (fr) * 2016-09-21 2018-03-29 Samsung Electronics Co., Ltd. Procédé et appareil pour gestion de faisceau au moyen de signaux de référence dans des systèmes de communication sans fil
WO2018056730A1 (fr) * 2016-09-23 2018-03-29 Samsung Electronics Co., Ltd. Procédé et appareil permettant un accès aléatoire dans des systèmes sans fil
CN109644455A (zh) * 2018-11-29 2019-04-16 北京小米移动软件有限公司 Csi测量反馈方法、装置及存储介质
CN110971370A (zh) * 2018-09-28 2020-04-07 夏普株式会社 由用户设备执行的方法以及用户设备

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WO2018056728A1 (fr) * 2016-09-21 2018-03-29 Samsung Electronics Co., Ltd. Procédé et appareil pour gestion de faisceau au moyen de signaux de référence dans des systèmes de communication sans fil
WO2018056730A1 (fr) * 2016-09-23 2018-03-29 Samsung Electronics Co., Ltd. Procédé et appareil permettant un accès aléatoire dans des systèmes sans fil
CN110971370A (zh) * 2018-09-28 2020-04-07 夏普株式会社 由用户设备执行的方法以及用户设备
CN109644455A (zh) * 2018-11-29 2019-04-16 北京小米移动软件有限公司 Csi测量反馈方法、装置及存储介质

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