WO2021223130A1 - Retour d'informations d'état de canal de sélection de port à multiples stades - Google Patents

Retour d'informations d'état de canal de sélection de port à multiples stades Download PDF

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Publication number
WO2021223130A1
WO2021223130A1 PCT/CN2020/088869 CN2020088869W WO2021223130A1 WO 2021223130 A1 WO2021223130 A1 WO 2021223130A1 CN 2020088869 W CN2020088869 W CN 2020088869W WO 2021223130 A1 WO2021223130 A1 WO 2021223130A1
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WO
WIPO (PCT)
Prior art keywords
csi
ports
stage
port selection
subset
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PCT/CN2020/088869
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English (en)
Inventor
Liangming WU
Yu Zhang
Chenxi HAO
Kangqi LIU
Min Huang
Qiaoyu Li
Hao Xu
Wanshi Chen
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Qualcomm Incorporated
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Priority to PCT/CN2020/088869 priority Critical patent/WO2021223130A1/fr
Publication of WO2021223130A1 publication Critical patent/WO2021223130A1/fr

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    • 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—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0226—Channel estimation using sounding signals sounding signals per se
    • 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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • 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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals

Definitions

  • aspects of the present disclosure generally relate to wireless communication and to techniques and apparatuses for multi-stage port selection channel state information feedback.
  • Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts.
  • Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, and/or the like) .
  • multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency-division multiple access (FDMA) systems, orthogonal frequency-division multiple access (OFDMA) systems, single-carrier frequency-division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE) .
  • LTE/LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP) .
  • UMTS Universal Mobile Telecommunications System
  • a wireless communication network may include a number of base stations (BSs) that can support communication for a number of user equipment (UEs) .
  • a user equipment (UE) may communicate with a base station (BS) via the downlink and uplink.
  • the downlink (or forward link) refers to the communication link from the BS to the UE
  • the uplink (or reverse link) refers to the communication link from the UE to the BS.
  • a BS may be referred to as a Node B, a gNB, an access point (AP) , a radio head, a transmit receive point (TRP) , a New Radio (NR) BS, a 5G Node B, and/or the like.
  • New Radio which may also be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP) .
  • 3GPP Third Generation Partnership Project
  • 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 orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL) , using CP-OFDM and/or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM) ) on the uplink (UL) , as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.
  • OFDM orthogonal frequency division multiplexing
  • SC-FDM e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)
  • DFT-s-OFDM discrete Fourier transform spread OFDM
  • MIMO multiple-input multiple-output
  • Fig. 1 is a block diagram conceptually illustrating an example of a wireless communication network, in accordance with various aspects of the present disclosure.
  • Fig. 2 is a block diagram conceptually illustrating an example of a base station in communication with a UE in a wireless communication network, in accordance with various aspects of the present disclosure.
  • Fig. 3 is a diagram illustrating an example of port selection channel state information feedback, in accordance with various aspects of the present disclosure.
  • Fig. 4 is a diagram illustrating an example of multi-stage channel state information reference signal precoding and port selection, in accordance with various aspects of the present disclosure.
  • Fig. 5 is a diagram illustrating an example process performed, for example, by a user equipment, in accordance with various aspects of the present disclosure.
  • Fig. 6 is a diagram illustrating an example process performed, for example, by a base station, in accordance with various aspects of the present disclosure.
  • a method of wireless communication may include receiving, from a base station, an indication of a set of channel state information (CSI) -reference signal (RS) ports, wherein receiving the indication of the set of CSI-RS ports is associated with a first stage of a two-stage CSI-RS precoding and port selection process; receiving, from the base station, a CSI report trigger; and transmitting, to the base station and based at least in part on the CSI report trigger, an initial port selection feedback message comprising an indication of a subset of CSI-RS ports of the set of CSI-RS ports, wherein transmitting the initial port selection feedback message is associated with the first stage of the two-stage CSI-RS precoding and port selection process.
  • CSI channel state information
  • RS reference signal
  • a method of wireless communication may include transmitting, to a UE, an indication of a set of CSI-RS ports, wherein transmitting the indication of the set of CSI-RS ports is associated with a first stage of a two-stage CSI-RS precoding and port selection process; transmitting a CSI report trigger; and receiving, from the UE and based at least in part on the CSI report trigger, an initial port selection feedback message comprising an indication of a subset of CSI-RS ports of the set of CSI-RS ports, wherein receiving the initial port selection feedback message is associated with the first stage of the two-stage CSI-RS precoding and port selection process.
  • a UE for wireless communication may include a memory and one or more processors operatively coupled to the memory.
  • the memory and the one or more processors may be configured to receive, from a base station, an indication of a set of CSI-RS ports, wherein receiving the indication of the set of CSI-RS ports is associated with a first stage of a two-stage CSI-RS precoding and port selection process; receive, from the base station, a CSI report trigger; and transmit, to the base station and based at least in part on the CSI report trigger, an initial port selection feedback message comprising an indication of a subset of CSI-RS ports of the set of CSI-RS ports, wherein transmitting the initial port selection feedback message is associated with the first stage of the two-stage CSI-RS precoding and port selection process.
  • a base station for wireless communication may include a memory and one or more processors operatively coupled to the memory.
  • the memory and the one or more processors may be configured to transmit, to a UE, an indication of a set of CSI-RS ports, wherein transmitting the indication of the set of CSI-RS ports is associated with a first stage of a two-stage CSI-RS precoding and port selection process; transmit a CSI report trigger; and receive, from the UE and based at least in part on the CSI report trigger, an initial port selection feedback message comprising an indication of a subset of CSI-RS ports of the set of CSI-RS ports, wherein receiving the initial port selection feedback message is associated with the first stage of the two-stage CSI-RS precoding and port selection process.
  • a non-transitory computer-readable medium may store one or more instructions for wireless communication.
  • the one or more instructions when executed by one or more processors of a UE, may cause the one or more processors to receive, from a base station, an indication of a set of CSI-RS ports, wherein receiving the indication of the set of CSI-RS ports is associated with a first stage of a two-stage CSI-RS precoding and port selection process; receive, from the base station, a CSI report trigger; and transmit, to the base station and based at least in part on the CSI report trigger, an initial port selection feedback message comprising an indication of a subset of CSI-RS ports of the set of CSI-RS ports, wherein transmitting the initial port selection feedback message is associated with the first stage of the two-stage CSI-RS precoding and port selection process.
  • a non-transitory computer-readable medium may store one or more instructions for wireless communication.
  • the one or more instructions when executed by one or more processors of a base station, may cause the one or more processors to transmit, to a UE, an indication of a set of CSI-RS ports, wherein transmitting the indication of the set of CSI-RS ports is associated with a first stage of a two-stage CSI-RS precoding and port selection process; transmit a CSI report trigger; and receive, from the UE and based at least in part on the CSI report trigger, an initial port selection feedback message comprising an indication of a subset of CSI-RS ports of the set of CSI-RS ports, wherein receiving the initial port selection feedback message is associated with the first stage of the two-stage CSI-RS precoding and port selection process.
  • an apparatus for wireless communication may include means for receiving, from a base station, an indication of a set of CSI-RS ports, wherein receiving the indication of the set of CSI-RS ports is associated with a first stage of a two-stage CSI-RS precoding and port selection process; means for receiving, from the base station, a CSI report trigger; and means for transmitting, to the base station and based at least in part on the CSI report trigger, an initial port selection feedback message comprising an indication of a subset of CSI-RS ports of the set of CSI-RS ports, wherein transmitting the initial port selection feedback message is associated with the first stage of the two-stage CSI-RS precoding and port selection process.
  • an apparatus for wireless communication may include means for transmitting, to a UE, an indication of a set of CSI-RS ports, wherein transmitting the indication of the set of CSI-RS ports is associated with a first stage of a two-stage CSI-RS precoding and port selection process; means for transmitting a CSI report trigger; and means for receiving, from the UE and based at least in part on the CSI report trigger, an initial port selection feedback message comprising an indication of a subset of CSI-RS ports of the set of CSI-RS ports, wherein receiving the initial port selection feedback message is associated with the first stage of the two-stage CSI-RS precoding and port selection process.
  • aspects generally include a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, wireless communication device, and/or processing system as substantially described herein with reference to and as illustrated by the drawings and specification.
  • Fig. 1 is a diagram illustrating a wireless network 100 in which aspects of the present disclosure may be practiced.
  • the wireless network 100 may be an LTE network or some other wireless network, such as a 5G or NR network.
  • the wireless network 100 may include a number of BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities.
  • a BS is an entity that communicates with user equipment (UEs) and may also be referred to as a base station, a NR BS, a Node B, a gNB, a 5G node B (NB) , an access point, a transmit receive point (TRP) , and/or the like.
  • Each BS may provide communication coverage for a particular geographic area.
  • the term “cell” can refer to a coverage area of a BS and/or a BS subsystem serving this coverage area, depending on the context in which the term is used.
  • a BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and/or another type of cell.
  • 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 association with the femto cell (e.g., UEs in a closed subscriber group (CSG) ) .
  • 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 BS 110a may be a macro BS for a macro cell 102a
  • a BS 110b may be a pico BS for a pico cell 102b
  • a BS 110c may be a femto BS for a femto cell 102c.
  • a BS may support one or multiple (e.g., three) cells.
  • eNB base station
  • NR BS NR BS
  • gNB gNode B
  • AP AP
  • node B node B
  • 5G NB 5G NB
  • cell may be used interchangeably herein.
  • a cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of a mobile BS.
  • the BSs may be interconnected to one another and/or to one or more other BSs or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces such as a direct physical connection, a virtual network, and/or the like using any suitable transport network.
  • Wireless network 100 may also include relay stations.
  • a relay station is an entity that can receive a transmission of data from an upstream station (e.g., a BS or a UE) and send a transmission of the data to a downstream station (e.g., a UE or a BS) .
  • a relay station may also be a UE that can relay transmissions for other UEs.
  • a relay station 110d may communicate with macro BS 110a and a UE 120d in order to facilitate communication between BS 110a and UE 120d.
  • a relay station may also be referred to as a relay BS, a relay base station, a relay, and/or the like.
  • Wireless network 100 may be a heterogeneous network that includes BSs of different types, e.g., macro BSs, pico BSs, femto BSs, relay BSs, and/or the like. These different types of BSs may have different transmit power levels, different coverage areas, and different impacts on interference in wireless network 100.
  • macro BSs may have a high transmit power level (e.g., 5 to 40 watts) whereas pico BSs, femto BSs, and relay BSs may have lower transmit power levels (e.g., 0.1 to 2 watts) .
  • a network controller 130 may couple to a set of BSs and may provide coordination and control for these BSs.
  • Network controller 130 may communicate with the BSs via a backhaul.
  • the BSs may also communicate with one another, e.g., directly or indirectly via a wireless or wireline backhaul.
  • UEs 120 may be dispersed throughout wireless network 100, and each UE may be stationary or mobile.
  • a UE may also be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, a station, and/or the like.
  • a UE may be a cellular phone (e.g., 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, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, biometric sensors/devices, wearable devices (smart watches, smart clothing, smart glasses, smart wrist bands, smart jewelry (e.g., smart ring, smart bracelet) ) , an entertainment device (e.g., a music or video device, or a satellite radio) , a vehicular component or sensor, smart meters/sensors, industrial manufacturing equipment, a global positioning system device, or any other suitable device that is configured to communicate via a wireless or wired medium.
  • PDA personal digital assistant
  • WLL wireless local loop
  • Some UEs may be considered machine-type communication (MTC) or evolved or enhanced machine-type communication (eMTC) UEs.
  • MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, and/or the like, that may communicate with a base station, 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, and/or may be implemented as NB-IoT (narrowband internet of things) devices.
  • IoT Internet-of-Things
  • NB-IoT narrowband internet of things
  • UE 120 may be included inside a housing that houses components of UE 120, such as processor components, memory components, and/or the like.
  • the processor components and the memory components may be coupled together.
  • the processor components e.g., one or more processors
  • the memory components e.g., a memory
  • the processor components and the memory components may be operatively coupled, communicatively coupled, electronically coupled, electrically coupled, and/or the like.
  • 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, and/or the like.
  • a frequency may also be referred to as a carrier, a frequency channel, and/or the like.
  • 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.
  • two or more UEs 120 may communicate directly using one or more sidelink channels (e.g., without using a base station 110 as an intermediary to communicate with one another) .
  • the UEs 120 may communicate using peer-to-peer (P2P) communications, device-to-device (D2D) communications, a vehicle-to-everything (V2X) protocol (e.g., which may include a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure (V2I) protocol, and/or the like) , a mesh network, and/or the like.
  • V2X vehicle-to-everything
  • the UE 120 may perform scheduling operations, resource selection operations, and/or other operations described elsewhere herein as being performed by the base station 110.
  • Fig. 1 is provided as an example. Other examples may differ from what is described with regard to Fig. 1.
  • Fig. 2 shows a block diagram of a design 200 of base station 110 and UE 120, which may be one of the base stations and one of the UEs in Fig. 1.
  • Base station 110 may be equipped with T antennas 234a through 234t
  • UE 120 may be equipped with R antennas 252a through 252r, where in general T ⁇ 1 and R ⁇ 1.
  • a transmit processor 220 may receive data from a data source 212 for one or more UEs, select one or more modulation and coding schemes (MCS) for each UE based at least in part on channel quality indicators (CQIs) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS (s) selected for the UE, and provide data symbols for all UEs. Transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI) and/or the like) and control information (e.g., CQI requests, grants, upper layer signaling, and/or the like) and provide overhead symbols and control symbols.
  • MCS modulation and coding schemes
  • Transmit processor 220 may also generate reference symbols for reference signals (e.g., the cell-specific reference signal (CRS) ) and synchronization signals (e.g., the primary synchronization signal (PSS) and secondary synchronization signal (SSS) ) .
  • a transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, the overhead symbols, and/or the reference symbols, if applicable, and may provide T output symbol streams to T modulators (MODs) 232a through 232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM and/or the like) to obtain an output sample stream.
  • TX transmit
  • MIMO multiple-input multiple-output
  • Each modulator 232 may process a respective output symbol stream (e.g., for OFDM and/or the like) to obtain an output sample stream.
  • Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
  • T downlink signals from modulators 232a through 232t may be transmitted via T antennas 234a through 234t, respectively.
  • the synchronization signals can be generated with location encoding to convey additional information.
  • antennas 252a through 252r may receive the downlink signals from base station 110 and/or other base stations and may provide received signals to demodulators (DEMODs) 254a through 254r, respectively.
  • Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a received signal to obtain input samples.
  • Each demodulator 254 may further process the input samples (e.g., for OFDM and/or the like) to obtain received symbols.
  • a MIMO detector 256 may obtain received symbols from all R demodulators 254a through 254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • a receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information and system information to a controller/processor 280.
  • a channel processor may determine reference signal received power (RSRP) , received signal strength indicator (RSSI) , reference signal received quality (RSRQ) , channel quality indicator (CQI) , and/or the like.
  • RSRP reference signal received power
  • RSSI received signal strength indicator
  • RSRQ reference signal received quality
  • CQI channel quality indicator
  • one or more components of UE 120 may be included in a housing.
  • Network controller 130 may include communication unit 294, controller/processor 290, and memory 292.
  • Network controller 130 may include, for example, one or more devices in a core network.
  • Network controller 130 may communicate with base station 110 via communication unit 294.
  • a transmit processor 264 may receive and process data from a data source 262 and control information (e.g., for reports comprising RSRP, RSSI, RSRQ, CQI, and/or the like) from controller/processor 280. Transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, and/or the like) , and transmitted to base station 110.
  • the UE 120 includes a transceiver.
  • the transceiver may include any combination of antenna (s) 252, modulators and/or demodulators 254, MIMO detector 256, receive processor 258, transmit processor 264, and/or TX MIMO processor 266.
  • the transceiver may be used by a processor (e.g., controller/processor 280) and memory 282 to perform aspects of any of the methods described herein, for example, as described with reference to Figs. 5-7.
  • the uplink signals from UE 120 and other UEs may be received by antennas 234, processed by 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 UE 120.
  • Receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to controller/processor 240.
  • Base station 110 may include communication unit 244 and communicate to network controller 130 via communication unit 244. In some aspects, the base station 110 includes a transceiver.
  • the transceiver may include any combination of antenna (s) 234, modulators and/or demodulators 232, MIMO detector 236, receive processor 238, transmit processor 220, and/or TX MIMO processor 230.
  • the transceiver may be used by a processor (e.g., controller/processor 240) and memory 242 to perform aspects of any of the methods described herein, for example, as described with reference to Figs. 5-7.
  • Controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component (s) of Fig. 2 may perform one or more techniques associated with multi-stage port selection channel state information (CSI) feedback, as described in more detail elsewhere herein.
  • controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component (s) of Fig. 2 may perform or direct operations of, for example, process 500 of Fig. 5, process 600 of Fig. 6, and/or other processes as described herein.
  • Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively.
  • memory 242 and/or memory 282 may comprise a non-transitory computer-readable medium storing one or more instructions for wireless communication.
  • the one or more instructions when executed (e.g., directly, or after compiling, converting, interpreting, and/or the like) by one or more processors of the base station 110 and/or the UE 120, may perform or direct operations of, for example, process 500 of Fig. 5, process 600 of Fig. 6, and/or other processes as described herein.
  • executing instructions may include running the instructions, converting the instructions, compiling the instructions, interpreting the instructions, and/or the like.
  • a scheduler 246 may schedule UEs for data transmission on the downlink and/or uplink.
  • UE 120 may include means for receiving, from a base station, an indication of a set of channel state information (CSI) -reference signal (RS) ports, wherein receiving the indication of the set of CSI-RS ports is associated with a first stage of a two-stage CSI-RS precoding and port selection process, means for receiving, from the base station, a CSI report trigger, means for transmitting, to the base station and based at least in part on the CSI report trigger, an initial port selection feedback message comprising an indication of a subset of CSI-RS ports of the set of CSI-RS ports, wherein transmitting the initial port selection feedback message is associated with the first stage of the two-stage CSI-RS precoding and port selection process, and/or the like.
  • CSI channel state information
  • RS reference signal
  • such means may include one or more components of UE 120 described in connection with Fig. 2, such as controller/processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, and/or the like.
  • base station 110 may include means for transmitting, to a UE, an indication of a set of CSI-RS ports, wherein transmitting the indication of the set of CSI-RS ports is associated with a first stage of a two-stage CSI-RS precoding and port selection process, means for receiving, from the UE, an initial port selection feedback message comprising an indication of a subset of CSI-RS ports of the set of CSI-RS ports, wherein receiving the initial port selection feedback message is associated with the first stage of the two-stage CSI-RS precoding and port selection process, and/or the like.
  • such means may include one or more components of base station 110 described in connection with Fig. 2, such as antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller/processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, and/or the like.
  • Fig. 2 is provided as an example. Other examples may differ from what is described with regard to Fig. 2.
  • Fig. 3 is a diagram illustrating an example 300 of port selection CSI feedback, in accordance with various aspects of the present disclosure. As shown, NR Release 16 and NR Release 17 each define precoders for Type 2 Port Selection Codebook CSI reporting.
  • the Type 2 precoder defined in NR Release 16 includes a linear combination of a precoded component 310 and a feedback component 315.
  • the precoded component 310 is precoded by a base station and the feedback component 315 is transmitted to the base station, by a UE, as feedback.
  • the precoded component 310, b i is the spatial domain basis vector, which represents the i-th column of the precoding matrix, W 1 .
  • the feedback component 315 includes a set of codebook-based linear combination coefficients, c i, m , and the frequency domain basis, which indicates the element at the m-th row and n-th column of the precoding matrix
  • the Type 2 precoder defined in NR Release 17 also includes a linear combination of a precoded component 325 and a feedback component 330.
  • the precoded component 325 is precoded by a base station and the feedback component 330 is transmitted to the base station, by a UE, as feedback.
  • the precoded component 325 includes the spatial domain basis vector and the frequency domain basis.
  • the feedback component 330 includes the set of codebook-based linear combination coefficients, c i, m .
  • Each combination of frequency domain and spatial domain basis vectors may be emulated as a CSI-RS port.
  • the precoded component 310 in the Release 16 precoder is the same for each allocated resource block (RB) across the set of spatial domain basis vectors.
  • RB resource block
  • N 3 RBs may be allocated.
  • the resulting number of CSI-RS ports corresponds to the number of spatial domain basis values in the spatial basis domain vector.
  • the number of ports, 2L-1 is constrained by the number of linear spatial beams, L, and the number of frequency domain basis elements, M.
  • the precoded component 325 for each RB associated with a spatial domain basis value includes a frequency domain rotation.
  • the resulting number of CSI-RS ports is based at least in part on the frequency domain rotation per spatial domain basis.
  • the number of ports, K is constrained by the number of joint linear combination coefficients. As a result, more ports are needed for the Release 17 Type 2 precoder than were needed for the Release 16 Type 2 precoder. The use of more ports causes a larger consumption of resources for precoding, which may result in diminished available resources.
  • a multi-stage CSI-RS precoding and port selection process may be provided.
  • a base station may provide an indication of a set of CSI-RS ports to a UE.
  • the set of CSI-RS ports may include a quantity, K, of ports.
  • the UE may provide port-selection feedback to the base station in the first stage, but does not provide, in the first stage, feedback including a precoding matrix indicator (PMI) with linear combination codebook coefficients.
  • the first stage port-selection feedback may include an indication of a subset of CSI-RS ports of the set of CSI-RS ports.
  • the subset of CSI-RS ports may include a quantity, K1, that is less than all K of the ports of the set of CSI-RS ports.
  • the base station may transmit, to the UE, a set of precoded CSI-RS ports.
  • the set of precoded CSI-RS ports may include one or more of the subset of K1 CSI-RS ports.
  • the UE may provide feedback containing the PMI and linear combination codebook coefficients.
  • by restricting the first stage feedback to an initial port selection and aspects may facilitate reducing the resources consumed at any given time for CSI reporting.
  • restricting the PMI and linear combination codebook coefficient feedback to a second stage and in connection with a reduced number of ports, due to first stage port selection and/or further port selection by the base station resource consumption associated with UE feedback may be reduced.
  • Fig. 3 is provided as an example. Other examples may differ from what is described with regard to Fig. 3.
  • Fig. 4 is a diagram illustrating an example 400 of multi-stage CSI-RS precoding and port selection, in accordance with various aspects of the present disclosure. As shown, a UE 120 and a base station 110 may communicate with one another.
  • the base station 110 may transmit, and the UE 120 may receive, an indication of a set 410 of CSI-RS ports and a CSI report trigger.
  • receiving the indication of the set 410 of CSI-RS ports may be associated with a first stage of a two-stage CSI-RS precoding and port selection process.
  • the set 410 of CSI-RS ports may include a first quantity, K (shown as 8, though the quantity may be less than 8 or more than 8) , of CSI-RS ports.
  • the CSI report trigger may be carried in the same communication as the indication of the set 410 of CSI-RS ports. In some aspects, the CSI report trigger may be carried in a separate communication from the indication of the set 410 of CSI-RS ports. In some aspects, the CSI report trigger may be carried in a radio resource control (RRC) message, a medium access control (MAC) -control element (CE) , downlink control information (DCI) , and/or the like. In some aspects, the CSI report trigger may correspond to the first stage of the two-stage CSI-RS precoding and port selection process, a second stage of the two-stage CSI-RS precoding and port selection process, and/or the like.
  • RRC radio resource control
  • MAC medium access control
  • CE control element
  • DCI downlink control information
  • the CSI report trigger may correspond to the first stage of the two-stage CSI-RS precoding and port selection process, a second stage of the two-stage CSI-RS precoding and port selection process, and/or the like
  • the CSI report trigger may include an aperiodic trigger, a periodic trigger, a semi-persistent trigger, and/or the like.
  • the CSI report trigger may include the semi-persistent trigger and the base station 110 may transmit, and the UE 120 may receive, a configuration of a plurality of periods.
  • the plurality of periods may be associated with the first stage of the two-stage CSI-RS precoding and port selection process, the second stage of the two-stage CSI-RS precoding and port selection process, and/or the like.
  • each of the plurality of periods may include the first stage of the two-stage CSI-RS precoding and port selection process, where the first stage occurs at a beginning of each of the plurality of periods; and one or more instances of the second stage of the two-stage CSI-RS precoding and port selection process.
  • the UE 120 may select a subset 420 of CSI-RS ports of the set 410 of CSI-RS ports.
  • the UE 120 may select the first port (represented by an index “1” ) , the third port (shown by an index “3” ) , the fourth port (shown by an index “4” ) , the fifth port (shown by an index “5” ) , the sixth port (shown by an index “6” ) , and the eighth port (shown by an index “8” ) .
  • the subset 420 of CSI-RS ports includes a quantity, K1, that is less than all of the set 410 of CSI-RS ports.
  • the UE 120 may select the subset 420 of CSI-RS ports based at least in part on performing a port selection procedure.
  • the port selection procedure may be configured by the base station 110.
  • the base station 110 may transmit, and the UE 120 may receive, the configuration of the port selection procedure.
  • the configuration of the port selection procedure may be carried in an RRC message, a MAC-CE, DCI, and/or the like.
  • the UE 120 may select the subset 420 of CSI-RS ports by applying a filter.
  • the filter may include a frequency domain filter.
  • the UE 120 may apply, to each CSI-RS port of the set of CSI-RS ports for each of a plurality of tones, a wideband filter having a length, N 3 , equal to a size of a CSI-RS port in a frequency domain to generate a set of filtered CSI-RS ports.
  • the filter may include the frequency domain filter:
  • the UE 120 may determine the best candidate ports by sorting a norm of the power, ⁇ e i ⁇ of the set of filtered CSI-RS ports.
  • the UE 120 may determine a relative power corresponding to each of the subset 420 of CSI-RS ports.
  • Each filtered CSI-RS port of a set of remaining filtered CSI-RS ports of the set of filtered CSI-RS ports may be quantized based at least in part on a ratio of a norm of each filtered CSI-RS port of the set of remaining filtered CSI-RS ports to the maximum filtered CSI-RS port,
  • the UE 120 may transmit, and the base station 110 may receive, an initial port selection feedback message.
  • the initial port selection feedback message may include an indication of the subset 420 of CSI-RS ports of the set 410 of CSI-RS ports.
  • transmitting the initial port selection feedback message may be associated with the first stage of the two-stage CSI-RS precoding and port selection process.
  • the initial port selection feedback message may be based at least in part on a configuration of a CSI report.
  • the base station 110 may transmit, and the UE 120 may receive, the configuration of a CSI report.
  • the configuration of the CSI report may indicate a quantity, K, of CSI-RS ports to be included in the set 410 of CSI-RS ports, a quantity, K1, of CSI-RS ports to be included in the subset 420 of CSI-RS ports, and/or the like.
  • the indication of the subset of CSI-RS ports may include a port index corresponding to each CSI-RS port in the subset 420 of CSI-RS ports, a group index corresponding to a plurality of CSI-RS ports in the subset 420 of CSI-RS ports, a bitmap indicating the subset 420 of CSI-RS ports, and/or the like.
  • the bitmap may include a set of bits, each bit corresponding to one CSI-RS port in the set 410 of CSI-RS ports.
  • the initial port selection feedback message may be carried in a part 1 CSI report.
  • the UE 120 may transmit, and the base station 110 may receive, a port relative power indication, as shown in Fig. 4.
  • the port relative power indication may be carried in a part 1 CSI report, a part 2 CSI report, and/or the like.
  • the UE 120 may transmit, and the base station 110 may receive, one or more CSI report components.
  • the one or more CSI report components may be carried in a part 1 CSI report.
  • the one or more CSI report components may include a channel quality indicator (CQI) , a rank indicator (RI) , and/or the like.
  • CQI channel quality indicator
  • RI rank indicator
  • the base station 110 may transmit, and the UE 120 may receive, a set 440 of precoded CSI-RS ports.
  • the set 440 of precoded CSI-RS ports may include a subset of the subset 420 of CSI-RS ports.
  • the set 440 of precoded CSI-RS ports may be determined, by the base station 110, based at least in part on the subset 420 of CSI-RS ports, a port power associated with each of the subset 420 of CSI-RS ports, and/or the like.
  • receiving the set 440 of precoded CSI-RS ports may be associated with a second stage of the two-stage CSI-RS precoding and port selection process.
  • the UE 120 may transmit, and the base station 110 may receive, an additional port selection feedback message.
  • the additional port selection feedback message may be associated with the second stage of the two-stage CSI-RS precoding and port selection process.
  • the additional port selection feedback message may include a linear combination coefficients codebook 450 corresponding to the set 440 of precoded CSI-RS ports.
  • the UE 120 may select a subset of the set 440 of precoded CSI-RS ports.
  • the additional port selection feedback message may include an indication of the subset of the set 440 of precoded CSI-RS ports.
  • the UE 120 may select the subset of the set 440 of precoded CSI-RS ports based at least in part on a second stage port selection configuration received from the base station 110, satisfaction of a condition, and/or the like.
  • the UE 120 may select the subset of the set 440 of precoded CSI-RS ports based at least in part on satisfaction of a condition associated with a quantity of precoded CSI-RS ports in the set 440 of precoded CSI-RS ports.
  • satisfaction of the condition occurs when the quantity of precoded CSI-RS ports in the set 440 of precoded CSI-RS ports satisfies a threshold quantity of precoded CSI-RS ports.
  • the threshold quantity may include sixteen precoded CSI-RS ports.
  • Fig. 4 is provided as an example. Other examples may differ from what is described with regard to Fig. 4.
  • Fig. 5 is a diagram illustrating an example process 500 performed, for example, by a UE, in accordance with various aspects of the present disclosure.
  • Example process 500 is an example where the UE (e.g., UE 120 and/or the like) performs operations associated with multi-stage port selection channel state information feedback.
  • the UE e.g., UE 120 and/or the like
  • process 500 may include receiving, from a base station, an indication of a set of CSI-RS ports, wherein receiving the indication of the set of CSI-RS ports is associated with a first stage of a two-stage CSI-RS precoding and port selection process (block 510) .
  • the UE e.g., using receive processor 258, controller/processor 280, memory 282, and/or the like
  • receiving the indication of the set of CSI-RS ports is associated with a first stage of a two-stage CSI-RS precoding and port selection process.
  • process 500 may include receiving, from the base station, a CSI report trigger (block 520) .
  • the UE e.g., using receive processor 258, controller/processor 280, memory 282, and/or the like
  • process 500 may include transmitting, to the base station and based at least in part on the CSI report trigger, an initial port selection feedback message comprising an indication of a subset of CSI-RS ports of the set of CSI-RS ports, wherein transmitting the initial port selection feedback message is associated with the first stage of the two-stage CSI-RS precoding and port selection process (block 530) .
  • the UE may transmit, to the base station and based at least in part on the CSI report trigger, an initial port selection feedback message comprising an indication of a subset of CSI-RS ports of the set of CSI-RS ports, as described above.
  • transmitting the initial port selection feedback message is associated with the first stage of the two-stage CSI-RS precoding and port selection process.
  • Process 500 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.
  • process 500 includes receiving, from the base station, an indication of a quantity of CSI-RS ports to be included in the subset of CSI-RS ports, wherein the subset of CSI-RS ports comprises less than all of the set of CSI-RS ports.
  • process 500 includes receiving, from the base station, a configuration of a CSI report, the configuration indicating at least one of: a quantity of CSI-RS ports to be included in the set of CSI-RS ports, a quantity of CSI-RS ports to be included in the subset of CSI-RS ports, or a combination thereof.
  • the indication of the subset of CSI-RS ports comprises at least one of: a port index corresponding to each CSI-RS port in the subset of CSI-RS ports, a group index corresponding to a plurality of CSI-RS ports in the subset of CSI-RS ports, a bitmap indicating the subset of CSI-RS ports, or a combination thereof.
  • the bitmap comprises a set of bits, and each bit of the set of bits corresponds to one CSI-RS port in the set of CSI-RS ports.
  • the initial port selection feedback message is carried in a part 1 CSI report.
  • process 500 includes transmitting, to the base station, a port relative power indication, wherein the port relative power indication is carried in at least one of: a part 1 CSI is reporting, a part 2 CSI is reporting, or a combination thereof.
  • process 500 includes selecting the subset of CSI-RS ports based at least in part on performing a port selection procedure.
  • process 500 includes receiving, from the base station, a configuration of the port selection procedure.
  • the configuration of the port selection procedure is carried in at least one of: an RRC message, a MAC-CE, DCI, or a combination thereof.
  • process 500 includes selecting the subset of CSI-RS ports by applying a filter.
  • the filter comprises a frequency domain filter.
  • process 500 selecting the subset of CSI-RS ports by: applying, to each CSI-RS port of the set of CSI-RS ports for each of a plurality of tones, a wideband filter having a length equal to a size of a CSI-RS port in a frequency domain to generate a set of power measurements corresponding to the set of CSI-RS ports; and sorting a norm of the set of power measurements.
  • process 500 includes determining a relative power corresponding to each of the subset of CSI-RS ports by: quantizing a maximum power measurement of the set of power measurements as zero decibels; and quantizing each remaining power measurement of the set of power measurements based at least in part on a ratio of a norm of each power measurement to the maximum power measurement.
  • process 500 includes receiving, from the base station, a set of precoded CSI-RS ports based at least in part on at least one of the set of CSI-RS ports, the subset of CSI-RS ports, a port power associated with each of the subset of CSI-RS ports, or a combination thereof, wherein receiving the set of precoded CSI-RS ports is associated with a second stage of the two-stage CSI-RS precoding and port selection process.
  • the set of precoded CSI-RS ports comprises a subset of the subset of CSI-RS ports.
  • process 500 includes transmitting, to the base station, a linear combination coefficients codebook corresponding to the set of precoded CSI-RS ports, wherein transmitting the linear combination coefficients codebook is associated with the second stage of the two-stage CSI-RS precoding and port selection process.
  • process 500 includes selecting a subset of the set of precoded CSI-RS ports; and transmitting, to the base station, an additional port selection feedback message comprising an indication of the subset of the set of precoded CSI-RS ports, wherein transmitting the additional port selection feedback message is associated with the second stage of the two-stage CSI-RS precoding and port selection process.
  • the UE selects the subset of the set of precoded CSI-RS ports based at least in part on at least one of: a second stage port selection configuration received from the base station, satisfaction of a condition, or a combination thereof.
  • the UE selects the subset of the set of precoded CSI-RS ports based at least in part on satisfaction of a condition associated with a quantity of precoded CSI-RS ports in the set of precoded CSI-RS ports.
  • satisfaction of the condition occurs when the quantity of precoded CSI-RS ports in the set of precoded CSI-RS ports satisfies a threshold quantity of precoded CSI-RS ports.
  • the threshold comprises sixteen precoded CSI-RS ports.
  • the CSI report trigger is carried in at least one of an RRC message, a MAC-CE, DCI, or a combination thereof.
  • the CSI report trigger corresponds to at least one of: the first stage of the two-stage CSI-RS precoding and port selection process, a second stage of the two-stage CSI-RS precoding and port selection process, or a combination thereof.
  • the CSI report trigger comprises at least one of: an aperiodic trigger, a periodic trigger, a semi-persistent trigger, or a combination thereof.
  • the CSI report trigger comprises the semi-persistent trigger
  • the method further comprising receiving a configuration of a plurality of periods associated with at least one of: the first stage of the two-stage CSI-RS precoding and port selection process, a second stage of the two-stage CSI-RS precoding and port selection process, or a combination thereof.
  • each of the plurality of periods comprises: the first stage of the two-stage CSI-RS precoding and port selection process, wherein the first stage occurs at a beginning of each of the plurality of periods; and one or more instances of the second stage of the two-stage CSI-RS precoding and port selection process.
  • process 500 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 5. Additionally, or alternatively, two or more of the blocks of process 500 may be performed in parallel.
  • Fig. 6 is a diagram illustrating an example process 600 performed, for example, by a base station, in accordance with various aspects of the present disclosure.
  • Example process 600 is an example where the base station (e.g., base station 110 and/or the like) performs operations associated with multi-stage port selection CSI feedback.
  • the base station e.g., base station 110 and/or the like
  • process 600 may include transmitting, to a UE, an indication of a set of CSI-RS ports, wherein transmitting the indication of the set of CSI-RS ports is associated with a first stage of a two-stage CSI-RS precoding and port selection process (block 610) .
  • the base station e.g., using transmit processor 220, controller/processor 240, memory 242, and/or the like
  • transmitting the indication of the set of CSI-RS ports is associated with a first stage of a two-stage CSI-RS precoding and port selection process.
  • process 600 may include transmitting, to the UE, a CSI report trigger (block 620) .
  • the base station e.g., using transmit processor 220, controller/processor 240, memory 242, and/or the like
  • process 600 may include receiving, from the UE and based at least in part on the CSI report trigger, an initial port selection feedback message comprising an indication of a subset of CSI-RS ports of the set of CSI-RS ports, wherein receiving the initial port selection feedback message is associated with the first stage of the two-stage CSI-RS precoding and port selection process (block 630) .
  • the base station may receive, from the UE and based at least in part on the CSI report trigger, an initial port selection feedback message comprising an indication of a subset of CSI-RS ports of the set of CSI-RS ports, as described above.
  • receiving the initial port selection feedback message is associated with the first stage of the two-stage CSI-RS precoding and port selection process.
  • Process 600 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.
  • the subset of CSI-RS ports comprises less than all of the set of CSI-RS ports.
  • process 600 includes transmitting, to the UE, a configuration of a CSI report, the configuration indicating at least one of: a quantity of CSI-RS ports to is am included in the set of CSI-RS ports, a quantity of CSI-RS ports to is am included in the subset of CSI-RS ports, or a combination thereof.
  • the indication of the subset of CSI-RS ports comprises at least one of: a port index corresponding to each CSI-RS port in the subset of CSI-RS ports, a group index corresponding to a plurality of CSI-RS ports in the subset of CSI-RS ports, a bitmap indicating the subset of CSI-RS ports, or a combination thereof.
  • the bitmap comprises a set of bits, and each bit of the set of bits corresponds to one CSI-RS port in the set of CSI-RS ports.
  • the initial port selection feedback message is carried in a part 1 CSI report.
  • process 600 includes receiving, from the UE, a port relative power indication, wherein the port relative power indication is being carried in at least one of: a part 1 CSI is reporting, a part 2 CSI is reporting, or a combination thereof.
  • process 600 includes transmitting, to the UE, a configuration of a port selection procedure.
  • the configuration of the port selection procedure is carried in at least one of: an RRC message, a MAC-CE, DCI, or a combination thereof.
  • process 600 includes transmitting, to the UE, a set of precoded CSI-RS ports based at least in part on at least one of the set of CSI-REC, the subset of CSI-RS ports, a port power associated with each of the subset of CSI-RS ports, or a combination thereof, wherein transmitting the set of precoded CSI-RS ports is associated with a second stage of the two-stage CSI-RS precoding and port selection process.
  • the set of precoded CSI-RS ports comprises a subset of the subset of CSI-RS ports.
  • process 600 includes receiving, from the UE, a linear combination coefficients codebook corresponding to the set of precoded CSI-RS ports, wherein receiving the linear combination coefficients codebook is associated with the second stage of the two-stage CSI-RS precoding and port selection process.
  • process 600 includes receiving, from the UE, an additional port selection feedback message comprising an indication of a subset of the set of precoded CSI-RS ports, wherein receiving the additional port selection feedback message is associated with the second stage of the two-stage CSI-RS precoding and port selection process.
  • the subset of the set of precoded CSI-RS ports is selected based at least in part on at least one of: a second stage port selection configuration transmitted to the UE, satisfaction of a condition, or a combination thereof.
  • the subset of the set of precoded CSI-RS ports is selected based at least in part on satisfaction of a condition associated with a quantity of precoded CSI-RS ports in the set of precoded CSI-RS ports.
  • satisfaction of the condition occurs when the quantity of precoded CSI-RS ports in the set of precoded CSI-RS ports satisfies a threshold quantity of precoded CSI-RS ports.
  • the threshold comprises sixteen precoded CSI-RS ports.
  • the CSI report trigger is carried in at least one of: an RRC message, a MAC-CE, DCI, or a combination thereof.
  • the CSI report trigger corresponds to at least one of: the first stage of the two-stage CSI-RS precoding and port selection process, a second stage of the two-stage CSI-RS precoding and port selection process, or a combination thereof.
  • the CSI report trigger comprises at least one of: an aperiodic trigger, a periodic trigger, a semi-persistent trigger, or a combination thereof.
  • the CSI report trigger comprises the semi-persistent trigger
  • process 600 includes transmitting, to the UE, a configuration of a plurality of periods associated with at least one of: the first stage of the two-stage CSI-RS precoding and port selection process, a second stage of the two-stage CSI-RS precoding and port selection process, or a combination thereof.
  • each of the plurality of periods comprises: one or more instances of the second stage of the two-stage CSI-RS precoding and port selection process.
  • process 600 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 6. Additionally, or alternatively, two or more of the blocks of process 600 may be performed in parallel.
  • ком ⁇ онент is intended to be broadly construed as hardware, firmware, and/or a combination of hardware and software.
  • a processor is implemented in hardware, firmware, and/or a combination of hardware and software.
  • satisfying a threshold may, depending on the context, refer to a value being greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, and/or the like.
  • “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) .
  • the terms “has, ” “have, ” “having, ” and/or the like are intended to be open-ended terms. Further, the phrase “based on” is intended to mean “based, at least in part, on” unless explicitly stated otherwise.

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Abstract

Divers aspects de la présente invention concernent de manière générale des communications sans fil. Selon certains aspects, un équipement d'utilisateur peut : recevoir, d'une station de base, une indication d'un ensemble de ports de signaux de référence (RS) d'informations d'état de canal (CSI), la réception de l'indication de l'ensemble de ports de RS-CSI étant associée à un premier stade d'un processus de précodage de RS-CSI et de sélection de ports à deux stades ; recevoir, de la station de base, un déclencheur de rapport de CSI ; et transmettre, à la station de base et sur la base au moins en partie du déclencheur de rapport de CSI, un message de retour de sélection de ports initiaux comprenant une indication d'un sous-ensemble de ports de RS-CSI de l'ensemble de ports de RS-CSI, la transmission du message de retour de sélection de ports initiaux étant associée au premier stade du processus de précodage de RS-CSI et de sélection de ports à deux stades. La divulgation concerne également de nombreux autres aspects.
PCT/CN2020/088869 2020-05-07 2020-05-07 Retour d'informations d'état de canal de sélection de port à multiples stades WO2021223130A1 (fr)

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Citations (4)

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CN107113034A (zh) * 2015-01-19 2017-08-29 高通股份有限公司 用于fd‑mimo的增强型csi反馈
WO2019052407A1 (fr) * 2017-09-12 2019-03-21 Qualcomm Incorporated Procédés et appareil pour indication de sous-ensemble de port csi-rs
WO2019099857A1 (fr) * 2017-11-17 2019-05-23 Huawei Technologies Co., Ltd. Système et procédé de mesure de canal et de mesure d'interférence dans un réseau sans fil
US20190363843A1 (en) * 2018-05-27 2019-11-28 Brian Gordaychik Next generation radio technologies

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CN107113034A (zh) * 2015-01-19 2017-08-29 高通股份有限公司 用于fd‑mimo的增强型csi反馈
WO2019052407A1 (fr) * 2017-09-12 2019-03-21 Qualcomm Incorporated Procédés et appareil pour indication de sous-ensemble de port csi-rs
WO2019099857A1 (fr) * 2017-11-17 2019-05-23 Huawei Technologies Co., Ltd. Système et procédé de mesure de canal et de mesure d'interférence dans un réseau sans fil
US20190363843A1 (en) * 2018-05-27 2019-11-28 Brian Gordaychik Next generation radio technologies

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