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WO2025030408A1 - Réduction de surdébit pour signal de référence d'informations d'état de canal comportant un grand nombre de ports d'antenne - Google Patents

Réduction de surdébit pour signal de référence d'informations d'état de canal comportant un grand nombre de ports d'antenne Download PDF

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Publication number
WO2025030408A1
WO2025030408A1 PCT/CN2023/111881 CN2023111881W WO2025030408A1 WO 2025030408 A1 WO2025030408 A1 WO 2025030408A1 CN 2023111881 W CN2023111881 W CN 2023111881W WO 2025030408 A1 WO2025030408 A1 WO 2025030408A1
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WIPO (PCT)
Prior art keywords
csi
network entity
antenna ports
cdm
resource
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PCT/CN2023/111881
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English (en)
Inventor
Yushu Zhang
Jia-Hong Liou
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Google LLC
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Google LLC
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Priority to PCT/CN2023/111881 priority Critical patent/WO2025030408A1/fr
Publication of WO2025030408A1 publication Critical patent/WO2025030408A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0016—Time-frequency-code
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • 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
    • 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
    • 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
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]

Definitions

  • the present disclosure relates generally to wireless communication, and more particularly, to overhead reduction for channel state information-reference signal (CSI-RS) with large number of antenna ports.
  • CSI-RS channel state information-reference signal
  • the Third Generation Partnership Project (3GPP) specifies a radio interface referred to as fifth generation (5G) new radio (NR) (5G NR) .
  • An architecture for a 5G NR wireless communication system includes a 5G core (5GC) network, a 5G radio access network (5G-RAN) , a user equipment (5G UE) , etc.
  • the 5G NR architecture seeks to provide increased data rates, decreased latency, and/or increased capacity compared to prior generation cellular communication systems.
  • Wireless communication systems in general, provide various telecommunication services (e.g., telephony, video, data, messaging, etc. ) based on multiple-access technologies, such as orthogonal frequency division multiple access (OFDMA) technologies, that support communication with multiple UEs. Improvements in mobile broadband continue the progression of such wireless communication technologies. For example, as the number of antenna ports in a wireless system increases, the overhead for channel state information-reference signal (CSI-RS) also increases. This is because each CSI-RS port requires a dedicated resource element (RE) in the frequency domain.
  • OFDMA orthogonal frequency division multiple access
  • Channel state information-reference signal is a signal transmitted by a network entity to enable a user equipment (UE) to estimate the channel between the UE and the network entity based on a measurement of the CSI-RS.
  • the number of CSI-RS ports used to transmit the CSI-RS is associated with the number of independent channel estimates that can be obtained by the UE. For example, a multiple-input multiple-output (MIMO) system with 8 CSI- RS ports can obtain 8 independent channel estimates.
  • MIMO multiple-input multiple-output
  • the overhead of CSI-RS also increases. This is because each CSI-RS port requires a dedicated resource element (RE) in the frequency domain.
  • RE resource element
  • a MIMO system with 8 CSI-RS ports requires at least 8 REs per slot.
  • the increasing overhead of CSI-RS can reduce the available bandwidth for data transmission. This is especially true in systems with a limited amount of bandwidth, such as those used for wireless mobile devices.
  • the network entity transmits a configuration to reduce the overhead in frequency-domain, such as by transmitting different code division multiplexing (CDM) groups for a CSI-RS in different resource blocks (RBs) .
  • the network entity transmits the configuration to reduce the overhead in time-domain, such as by transmitting different CDM groups for a CSI-RS resource in different slots.
  • the network entity transmits the configuration to reduce the overhead based on multiple UEs receiving a common CSI-RS.
  • the UE receives, from the network entity, the CSI-RS on a channel measurement resource (CMR) configured based on a resource mapping pattern associated with a number of antenna ports for the CSI-RS being at or above a threshold level.
  • CMR channel measurement resource
  • the UE transmits, to the network entity, a CSI report including measurement information associated with the resource mapping pattern of the CSI-RS.
  • the network entity transmits, to the UE, the CSI-RS, on a CMR, configured based on a resource mapping pattern associated with a number of antenna ports for the CSI-RS being at or above a threshold level.
  • the network entity receives, from the UE, a CSI report including measurement information associated with the resource mapping pattern of the CSI-RS.
  • FIG. 1 illustrates a diagram of a wireless communications system that includes a plurality of user equipments (UEs) and network entities in communication over one or more cells according to an embodiment.
  • UEs user equipments
  • FIG. 2 is an example of channel state information-reference signal (CSI-RS) transmission from 32 antenna ports with 4 code division multiplexing (CDM) groups and frequency domain (FD) density as 0.5 according to an embodiment.
  • CSI-RS channel state information-reference signal
  • FIG. 3 is a signaling diagram illustrating communications between a UE and a network entity for performing channel state information (CSI) reporting based on CSI-RS with overhead reduction according to an embodiment.
  • CSI channel state information
  • FIG. 4 is an example of CSI-RS transmission from 128 antenna ports with the FD density of 0.25 based on a uniform distribution according to an embodiment.
  • FIG. 5 is an example of CSI-RS transmission from 128 antenna ports with the FD density of 0.25 based on a non-uniform distribution an embodiment.
  • FIG. 6 is an example of CSI-RS transmission from 128 antenna ports with the FD density of 0.25 in configured RBs in every 4 RBs according to an embodiment.
  • FIG. 7 is an example of CSI-RS transmission from 128 antenna ports with the FD density of 0.5 based on 8 CDM groups in each of the 2 configured slots according to an embodiment.
  • FIG. 8 is an example of CSI-RS transmission from 128 antenna ports with the FD density of 0.5 based on the configured slot index and symbol index in 2 slots according to an embodiment.
  • FIG. 9 is an example of a cyclic mapping for CSI-RS with multiple repetitions according to an embodiment.
  • FIG. 10 is an example of a sequential mapping for CSI-RS with multiple repetitions according to an embodiment.
  • FIG. 11 is an example for CSI measurement by receiving the CSI-RS in available slots according to an embodiment.
  • FIG. 12 is an example of shared CSI-RS for the UEs with different capabilities according to an embodiment.
  • FIG. 13 is an example of block-wise port indexing compared to per CSI-RS resource port indexing according to an embodiment.
  • FIG. 14 is an example of multiple CSI-RS resources based on CSI measurement according to an embodiment.
  • FIG. 15 is an example of multiple CSI-RS resources based on CSI measurement according to another embodiment.
  • FIG. 16 is a flowchart of a method of wireless communication at a UE according to an embodiment.
  • FIG. 17 is a flowchart of a method of wireless communication at a network entity according to an embodiment.
  • FIG. 18 is a diagram illustrating a hardware implementation for an example UE apparatus according to some embodiments.
  • FIG. 19 is a diagram illustrating a hardware implementation for one or more example network entities according to some embodiments.
  • FIG. 1 illustrates a diagram 100 of a wireless communications system associated with a plurality of cells 190.
  • the wireless communications system includes user equipments (UEs) 102 and base stations/network entities 104.
  • Some base stations may include an aggregated base station architecture and other base stations may include a disaggregated base station architecture.
  • the aggregated base station architecture utilizes a radio protocol stack that is physically or logically integrated within a single radio access network (RAN) node.
  • RAN radio access network
  • a disaggregated base station architecture utilizes a protocol stack that is physically or logically distributed among two or more units (e.g., radio unit (RU) 106, distributed unit (DU) 108, central unit (CU) 110) .
  • RU radio unit
  • DU distributed unit
  • CU central unit
  • a CU 110 is implemented within a RAN node, and one or more DUs 108 may be co-located with the CU 110, or alternatively, may be geographically or virtually distributed throughout one or multiple other RAN nodes.
  • the DUs 108 may be implemented to communicate with one or more RUs 106. Any of the RU 106, the DU 108 and the CU 110 can be implemented as virtual units, such as a virtual radio unit (VRU) , a virtual distributed unit (VDU) , or a virtual central unit (VCU) .
  • the base station/network entity 104 e.g., an aggregated base station or disaggregated units of the base station, such as the RU 106 or the DU 108) , may be referred to as a transmission reception point (TRP) .
  • TRP transmission reception point
  • Operations of the base station 104 and/or network designs may be based on aggregation characteristics of base station functionality.
  • disaggregated base station architectures are utilized in an integrated access backhaul (IAB) network, an open-radio access network (O-RAN) network, or a virtualized radio access network (vRAN) , which may also be referred to a cloud radio access network (C-RAN) .
  • Disaggregation may include distributing functionality across the two or more units at various physical locations, as well as distributing functionality for at least one unit virtually, which can enable flexibility in network designs.
  • the various units of the disaggregated base station architecture, or the disaggregated RAN architecture can be configured for wired or wireless communication with at least one other unit.
  • the base stations 104d, 104e and/or the RUs 106a, 106b, 106c, 106d may communicate with the UEs 102a, 102b, 102c, 102d, and/or 102s via one or more radio frequency (RF) access links based on a Uu interface.
  • RF radio frequency
  • multiple RUs 106 and/or base stations 104 may simultaneously serve the UEs 102, such as by intra-cell and/or inter-cell access links between the UEs 102 and the RUs 106/base stations 104.
  • the RU 106, the DU 108, and the CU 110 may include (or may be coupled to) one or more interfaces configured to transmit or receive information/signals via a wired or wireless transmission medium.
  • a wired interface can be configured to transmit or receive the information/signals over a wired transmission medium, such as via the fronthaul link 160 between the RU 106d and the baseband unit (BBU) 112 of the base station 104d associated with the cell 190d.
  • the BBU 112 includes a DU 108 and a CU 110, which may also have a wired interface (e.g., midhaul link) configured between the DU 108 and the CU 110 to transmit or receive the information/signals between the DU 108 and the CU 110.
  • a wired interface e.g., midhaul link
  • a wireless interface which may include a receiver, a transmitter, or a transceiver, such as an RF transceiver, configured to transmit and/or receive the information/signals via the wireless transmission medium, such as for information communicated between the RU 106a of the cell 190a and the base station 104e of the cell 190e via cross-cell communication beams 136-138 of the RU 106a and the base station 104e.
  • a wireless interface which may include a receiver, a transmitter, or a transceiver, such as an RF transceiver, configured to transmit and/or receive the information/signals via the wireless transmission medium, such as for information communicated between the RU 106a of the cell 190a and the base station 104e of the cell 190e via cross-cell communication beams 136-138 of the RU 106a and the base station 104e.
  • the RUs 106 may be configured to implement lower layer functionality.
  • the RU 106 is controlled by the DU 108 and may correspond to a logical node that hosts RF processing functions, or lower layer PHY functionality, such as execution of fast Fourier transform (FFT) , inverse FFT (iFFT) , digital beamforming, physical random access channel (PRACH) extraction and filtering, etc.
  • FFT fast Fourier transform
  • iFFT inverse FFT
  • PRACH physical random access channel extraction and filtering
  • the functionality of the RU 106 may be based on the functional split, such as a functional split of lower layers.
  • the RUs 106 may transmit or receive over-the-air (OTA) communication with one or more UEs 102.
  • the RU 106b of the cell 190b communicates with the UE 102b of the cell 190b via a first set of communication beams 132 of the RU 106b and a second set of communication beams 134b of the UE 102b, which may correspond to inter-cell communication beams or, in some examples, cross-cell communication beams.
  • the UE 102b of the cell 190b may communicate with the RU 106a of the cell 190a via a third set of communication beams 134a of the UE 102b and a fourth set of communication beams 136 of the RU 106a.
  • DUs 108 can control both real-time and non-real-time features of control plane and user plane communications of the RUs 106.
  • the base station 104 may include at least one of the RU 106, the DU 108, or the CU 110.
  • the base stations 104 provide the UEs 102 with access to a core network.
  • the base stations 104 may relay communications between the UEs 102 and the core network (not shown) .
  • the base stations 104 may be associated with macrocells for higher-power cellular base stations and/or small cells for lower-power cellular base stations.
  • the cell 190e may correspond to a macrocell
  • the cells 190a-190d may correspond to small cells.
  • Small cells include femtocells, picocells, microcells, etc.
  • a network that includes at least one macrocell and at least one small cell may be referred to as a “heterogeneous network. ”
  • Uplink transmissions from a UE 102 to a base station 104/RU 106 are referred to as uplink (UL) transmissions, whereas transmissions from the base station 104/RU 106 to the UE 102 are referred to as downlink (DL) transmissions.
  • Uplink transmissions may also be referred to as reverse link transmissions and downlink transmissions may also be referred to as forward link transmissions.
  • the RU 106d utilizes antennas of the base station 104d of cell 190d to transmit a downlink/forward link communication to the UE 102d or receive an uplink/reverse link communication from the UE 102d based on the Uu interface associated with the access link between the UE 102d and the base station 104d/RU 106d.
  • Communication links between the UEs 102 and the base stations 104/RUs 106 may be based on multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and/or transmit diversity.
  • the communication links may be associated with one or more carriers.
  • the UEs 102 and the base stations 104/RUs 106 may utilize a spectrum bandwidth of Y MHz (e.g., 5, 10, 15, 20, 100, 400, 800, 1600, 2000, etc. MHz) per carrier allocated in a carrier aggregation of up to a total of Yx MHz, where x component carriers (CCs) are used for communication in each of the uplink and downlink directions.
  • Y MHz e.g., 5, 10, 15, 20, 100, 400, 800, 1600, 2000, etc. MHz
  • CCs component carriers
  • the carriers may or may not be adjacent to each other along a frequency spectrum.
  • uplink and downlink carriers may be allocated in an asymmetric manner, with more or fewer carriers allocated to either the uplink or the downlink.
  • a primary component carrier and one or more secondary component carriers may be included in the component carriers.
  • the primary component carrier may be associated with a primary cell (PCell) and a secondary component carrier may be associated with a secondary cell (SCell) .
  • Some UEs 102 may perform device-to-device (D2D) communications over sidelink.
  • D2D device-to-device
  • a sidelink communication/D2D link utilizes a spectrum for a wireless wide area network (WWAN) associated with uplink and downlink communications.
  • WWAN wireless wide area network
  • Such sidelink/D2D communication may be performed through various wireless communications systems, such as wireless fidelity (Wi-Fi) systems, Bluetooth systems, Long Term Evolution (LTE) systems, New Radio (NR) systems, etc.
  • Wi-Fi wireless fidelity
  • LTE Long Term Evolution
  • NR New Radio
  • the UEs 102 and the base stations 104/RUs 106 may each include a plurality of antennas.
  • the plurality of antennas may correspond to antenna elements, antenna panels, and/or antenna arrays that may facilitate beamforming operations.
  • the RU 106b transmits a downlink beamformed signal based on a first set of communication beams 132 to the UE 102b in one or more transmit directions of the RU 106b.
  • the UE 102b may receive the downlink beamformed signal based on a second set of communication beams 134b from the RU 106b in one or more receive directions of the UE 102b.
  • the UE 102b may also transmit an uplink beamformed signal (e.g., sounding reference signal (SRS) ) to the RU 106b based on the second set of communication beams 134b in one or more transmit directions of the UE 102b.
  • the RU 106b may receive the uplink beamformed signal from the UE 102b in one or more receive directions of the RU 106b.
  • the UE 102b may perform beam training to determine the best receive and transmit directions for the beamformed signals.
  • the transmit and receive directions for the UEs 102 and the base stations 104/RUs 106 may or may not be the same.
  • beamformed signals may be communicated between a first base station/RU 106a and a second base station 104e.
  • the base station 104e of the cell 190e may transmit a beamformed signal to the RU 106a based on the communication beams 138 in one or more transmit directions of the base station 104e.
  • the RU 106a may receive the beamformed signal from the base station 104e of the cell 190e based on the RU communication beams 136 in one or more receive directions of the RU 106a.
  • the base station 104e transmits a downlink beamformed signal to the UE 102e based on the communication beams 138 in one or more transmit directions of the base station 104e.
  • the UE 102e receives the downlink beamformed signal from the base station 104e based on UE communication beams 130 in one or more receive directions of the UE 102e.
  • the UE 102e may also transmit an uplink beamformed signal to the base station 104e based on the UE communication beams 130 in one or more transmit directions of the UE 102e, such that the base station 104e may receive the uplink beamformed signal from the UE 102e in one or more receive directions of the base station 104e.
  • the base station 104 may include and/or be referred to as a network entity. That is, “network entity” may refer to the base station 104 or at least one unit of the base station 104, such as the RU 106, the DU 108, and/or the CU 110.
  • the base station 104 may also include and/or be referred to as a next generation evolved Node B (ng-eNB) , a next generation NB (gNB) , an evolved NB (eNB) , an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS) , an extended service set (ESS) , a TRP, a network node, network equipment, or other related terminology.
  • ng-eNB next generation evolved Node B
  • gNB next generation NB
  • eNB evolved NB
  • an access point a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS) , an extended service set (ESS) , a TRP, a network node, network equipment, or other related terminology.
  • BSS basic service set
  • ESS extended service set
  • the base station 104 or an entity at the base station 104 can be implemented as an IAB node, a relay node, a sidelink node, an aggregated (monolithic) base station, or a disaggregated base station including one or more RUs 106, DUs 108, and/or CUs 110.
  • a set of aggregated or disaggregated base stations may be referred to as a next generation-radio access network (NG-RAN) .
  • the UE 102a operates in dual connectivity (DC) with the base station 104e and the base station/RU 106a.
  • the base station 104e can be a master node and the base station/RU 160a can be a secondary node.
  • any of the UEs 102 may include a report component 140 configured to receive, from the network entity, a channel state information-reference signal (CSI-RS) on a channel measurement resource (CMR) configured based on a resource mapping pattern associated with a number of antenna ports for the CSI-RS being at or above a threshold level; transmit, to the network entity, a channel state information (CSI) report including measurement information associated with the resource mapping pattern of the CSI-RS.
  • CSI-RS channel state information-reference signal
  • CMR channel measurement resource
  • CSI channel state information
  • any of the base stations 104 or a network entity of the base stations 104 may include a configuration component 150 configured to transmit, to a UE 102, a CSI-RS on a CMR configured based on a resource mapping pattern associated with a number of antenna ports for the CSI-RS being at or above a threshold level; and receive, from the UE 102, a CSI report including measurement information associated with the resource mapping pattern of the CSI-RS.
  • FIG. 1 describes a wireless communication system that may be implemented in connection with aspects of one or more other figures described herein.
  • 5G NR 5G Advanced and future versions
  • LTE Long Term Evolution
  • LTE-A LTE-advanced
  • 6G 6G
  • FIG. 2 illustrates a diagram 200 of an example of CSI-RS transmission with 32 antenna ports with 4 code division multiplexing (CDM) -8 groups (frequency domain (FD) 2 + time domain (TD) 4) and the FD density as 0.5.
  • the CSI can provide the information for a network entity 104 to select the digital precoder for the UE 102.
  • the network entity 104 can configure a CSI report using radio resource control (RRC) signaling, for example, CSI-ReportConfig, where CSI-RS is used as a CMR for the UE 102 to measure the downlink channel.
  • RRC radio resource control
  • CSI-ReportConfig for example, CSI-ReportConfig
  • CSI-RS is used as a CMR for the UE 102 to measure the downlink channel.
  • the network entity 104 may configure an interference measurement resource (IMR) for the UE 102 to measure an interference.
  • IMR interference measurement resource
  • the UE 102 can identify the CSI, which may include at least one of a rank indicator (RI) , a precoder matrix indicator (PMI) , a channel quality indicator (CQI) , and a layer indicator (LI) .
  • the RI and PMI indicate the digital precoder.
  • the CQI indicates the signal-to-interference plus noise (SINR) status in order to assist the network entity 104 to determine the modulation and coding scheme (MCS) .
  • the LI identifies the strongest layer for the reported precoder indicated by the RI and PMI.
  • the network entity 104 can transmit the CSI-RS from a maximum of 32 antenna ports.
  • the network entity can transmit the CSI-RS by using a plurality of code division multiplexing (CDM) groups.
  • CDM groups In each CDM group, the network entity can apply at least one of frequency domain orthogonal cover code (FD-OCC) or time domain orthogonal cover code (TD-OCC) for different antenna ports.
  • Different CDM groups can be multiplexed in at least one of frequency domain multiplexing (FDM) or time domain multiplexing (TDM) manner in one resource block (RB) .
  • the network entity can transmit the CSI-RS in multiple RBs with a configured FD density per port, ⁇ 0.5, 1, 3 ⁇ resource elements (REs) per RB. Referring to FIG.
  • RB 202 indicates a resource block with a CSI-RS and RB 204 indicates resource block without a CSI-RS.
  • RB 202 includes 168 REs.
  • An example 200 shows a structure of 32 CSI-RS port transmission based on a combination of 4 CDM groups (e.g., CDM group 0 206, CDM group 1 208, CDM group 2 210, and CDM group 3 212) with time and frequency domain multiplexing in one RB.
  • CDM groups e.g., CDM group 0 206, CDM group 1 208, CDM group 2 210, and CDM group 3 212
  • FIG. 2 shows four CDM groups (e.g., CDM group 0 206, CDM group 1 208, CDM group 2 210, and CDM group 3 212) , it is understood that the structure of CSI-RS port may be based on a combination of more or less than four CDM groups based on various aspects describe in detail below.
  • FIG. 3 illustrates a signaling diagram of an example scenario in which UE and network entity exchanges messages and implement procedures for performing CSI report based on CSI-RS with overhead reduction techniques.
  • FIG. 3 illustrates a signaling diagram 300 of communications between a UE and a network entity for performing CSI report based on CSI-RS with overhead reduction techniques according to an embodiment.
  • the network entity 104 may correspond to the base station or an entity at the base station, such as the RU 106, the DU 108, the CU 110, etc.
  • the UE 102 may transmit 302, to the network entity 104, (and the network entity 104 may receive 302 from the UE 102) an indication of a UE capability for supporting resource mapping patterns with CSI-RS overhead reduction.
  • the UE capability may include at least one of a supported FD density for the CSI-RS, supported FDM scheme (s) for the CDM groups for CSI-RS, supported TDM scheme (s) for the CDM groups for CSI-RS, a supported FD-OCC length, a supported TD-OCC length, a minimum number of REs per CSI-RS port per subband for PMI or CQI report.
  • the UE 102 may report the UE capability for the CSI-RS with a certain number of antenna ports, for example, 64, 128, or more. Note that the embodiments of this disclosure may be applicable for the CSI-RS with a certain number of antenna ports (e.g., 64, 128, or more) .
  • the network entity 104 transmits 304, to the UE 102, (and the UE 102 receives 304 from the network entity 104) RRC configuration enabling resource mapping patterns with CSI-RS overhead reduction and/or configuring a subband size.
  • the network entity 104 configures a resource mapping pattern for the CSI-RS resource based on one of the parameters: RB index and subcarrier (s) in a RB for each CDM group, slot index and starting symbol index within a slot for each CDM group, port indexing scheme, CDM length for each CDM group; CDM type for each CDM group.
  • the network entity 104 may also configure the subband size based on the FD density for the CSI-RS.
  • the network entity 104 may transmit the control signaling by RRC signaling, e.g., RRCReconfiguration or CSI-ReportConfig.
  • the network entity 104 may configure a codebook for CSI report based on Type1 codebook, Type2 codebook, enhanced Type2 (eType2) codebook, or further enhanced Type2 (feType2) codebook.
  • the network entity 104 may transmit 306, to the UE 102, (and the UE 102 may receive 306 from the network entity 104) medium access control-control element (MAC CE) or downlink control information (DCI) activating or triggering the CSI report.
  • MAC CE medium access control-control element
  • DCI downlink control information
  • the network entity 104 may transmit MAC CE or DCI activating or triggering the CSI-RS.
  • the network entity 104 transmits 308, to the UE 102, (and the UE 102 receives 308) CSI-RS resource (s) based on the configured resource mapping pattern.
  • the UE 102 measures CSI based on the received CSI-RS resource (s) .
  • the UE 102 may further determine the CSI for each subband based on the configured subband size.
  • the UE 102 After measuring the CSI, the UE 102 transmits 310, to the network entity 104, (and the network entity 104 receives from the UE 102) CSI report based on the CSI-RS and CSI report configuration via physical uplink shared channel (PUSCH) or physical uplink control channel (PUCCH) .
  • PUSCH physical uplink shared channel
  • PUCCH physical uplink control channel
  • an RRC signaling may indicate an RRC reconfiguration message from the network entity 104 to UE 102, or a system information block (SIB) , where the SIB can be an existing SIB (e.g., SIB1) or a new SIB (e.g., SIB J, where J is an integer above 21) transmitted by gNB.
  • SIB system information block
  • the network entity may receive the UE capability from a UE 102 or from a core network (e.g., Access and Mobility Management Function (AMF) ) or another network entity.
  • AMF Access and Mobility Management Function
  • FIG. 3 describes a signaling diagram of an example scenario in which a UE and a network entity exchange messages and implement procedures for performing CSI reporting based on CSI-RS with overhead reduction techniques according to an embodiment
  • FIG. 4 describes an example of CSI-RS transmission from 128 antenna ports with the FD density of 0.25 based on the uniform distribution in every 4 RBs according to an embodiment.
  • FIG. 4 illustrates a diagram 400 of an example of CSI-RS transmission from 128 antenna ports with the FD density of 0.25 based on the uniform distribution in every 4 RBs according to an embodiment.
  • the network entity 104 transmits different CDM groups (e.g., CDM groups 0-15) for a CSI-RS in different RBs (e.g., 402, 404, 406, 408) .
  • CDM group 0 is 410
  • CDM group 1 is 412
  • CDM group 2 is 414
  • CDM group 3 is 416
  • CDM group 0 is 410
  • CDM group 1 is 412
  • CDM group 2 is 414
  • CDM group 3 is 416.
  • CDM groups 4-15 are not shown in FIG. 4.
  • the network entity 104 transmits 4 CDM in each RB.
  • the network entity 104 transmits CDM group 0-3 in RB 402, CDM group 4-7 in RB 404, CDM group 8-11 in RB 406, and CDM group 12-15 in RB 408.
  • the network entity 104 may configure the FD density for each port or each CDM group or all CDM groups.
  • the FD density may be predefined for a certain number of antenna ports.
  • the network entity 104 and the UE 102 determine the FD density based on the number of antenna ports for the CSI-RS.
  • the FD density is 0.5 for 64 ports and 0.25 for 128 ports.
  • the network entity 104 transmits the CDM groups based on uniform distribution in every N RBs allocated for the CSI-RS. Referring to FIG. 4, the network entity 104 transmits the CDM groups (e.g., CDM group 0-3, CDM group 4-7, CDM group 8-11, CDM group 12-15) based on uniform distribution in every 4 RBs.
  • the network entity may configure a common or separate starting RE index in an RB for each CDM group.
  • the network entity may configure the number of CDM groups per RB.
  • the network entity configures four CDM groups per RB.
  • FIG. 4 describes an example of CSI-RS transmission from 128 antenna ports with the FD density of 0.25 based on the uniform distribution in every 4 RBs according to an embodiment
  • FIG. 5 illustrates an example of CSI-RS transmission from 128 ports CSI-RS with the FD density of 0.25 based on the non-uniform distribution in every 4 RBs according to an embodiment.
  • FIG. 5 illustrates a diagram 500 of an example of CSI-RS transmission from 128 antenna ports with the FD density of 0.25 based on the non-uniform distribution in every 4 RBs according to an embodiment.
  • the network entity 104 transmits the CDM groups based on non-uniform distribution in every N RBs allocated for the CSI-RS.
  • 510 denotes 1 CDM group.
  • the network entity 104 transmits the CSI-RS with 16 CDM groups (e.g., CDM group 0-15) in two RBs (e.g., 502A, 502B) with CSI-RS 502.
  • the network entity 104 transmits the 12 CDM groups with time and frequency domain multiplexing in RB 502A.
  • the network entity 104 transmits the 4 CDM groups with time and frequency domain multiplexing in RB 502B.
  • the network entity 104 does not transmit CSI-RS in RB 504.
  • the network entity 104 may transmit the CDM groups that are multiplexed in FDM manner in consecutive subcarriers.
  • the network entity may configure or indicate the starting RE index within consecutive subcarriers.
  • the network entity may configure the starting RB index within every N RBs.
  • FIG. 5 describes an example of CSI-RS transmission from 128 antenna ports with the FD density of 0.25 based on the non-uniform distribution in every 4 RBs according to an embodiment
  • FIG. 6 illustrates an example 600 of CSI-RS transmission from 128 antenna ports with the FD density of 0.25 in configured RBs in every 4 RBs according to an embodiment.
  • the network entity 104 configures an RB index in every N RBs for each CDM group.
  • the network entity 104 further configures the starting RE index within the configured RB for each CDM group.
  • the first state of bit x may indicate the RB x within every N RBs is not allocated for any CDM group, and the second state of bit x may indicate the RB x within every N RBs is allocated for at least one CDM group.
  • the opposite operation of the first and second state of bit x may be also possible.
  • the network entity 104 configures a bitmap indicating the RB location for all the CDM groups (e.g., 610) in every 4 RBs. For example, ⁇ 1 1 1 0 ⁇ indicates RB1, 2, 3 within every 4 RBs is allocated for CDM group and RB4 within every 4 RBs is not allocated for CDM group.
  • RB 602 indicate RB with CSI-RS and RB 604 indicates RB without CSI-RS.
  • 610 denotes 1 CDM group.
  • the network entity 104 transmits 4 CDM groups with time and frequency domain multiplexing in RB 602A.
  • the network entity 104 transmits 6 CDM groups 610 with time and frequency domain multiplexing in RBs 602B and 602C.
  • the network entity 104 may transmit the CDM groups in the configured RBs in every N RBs in uniform or non-uniform manner.
  • the number of CDM groups in each configured RBs may be determined based on the total number of CDM groups and the number of configured RBs in every N RBs.
  • the number of CDM groups in the first configured RB is and the number of CDM groups in other configured RB is where N CDM indicates the number of CDM groups and K RB indicates the number of configured RBs in every N RBs.
  • FIG. 6 describes an example 600 for the 128 ports CSI-RS with the FD density of 0.25 in configured RBs in every 4 RBs according to an embodiment
  • FIG. 7 illustrates an example 700 of CSI-RS transmission from 128 antenna ports with the FD density of 0.5 based on 8 CDMs in each of the 2 configured slots according to an embodiment.
  • FIG. 7 illustrates a diagram 700 of CSI-RS transmission from 128 antenna ports with the FD density of 0.5 based on 8 CDM groups in each of the 2 configured slots according to an embodiment.
  • RB 702 indicates RB with CSI-RS and RB 704 indicates RB without CSI-RS.
  • the network entity 104 transmits 8 CDM groups (710A and 710B) .
  • the network entity 104 also transmits 8 CDM groups (710C and 710D) .
  • the UE 102 measures the CSI for the subband with the number of REs for each port greater than or equal to a threshold.
  • the threshold may be predefined, for example, 2 REs, or reported by the UE via UE capability.
  • the network entity 104 refrains from configuring the CSI-RS and subband size for subband CSI feedback with the number of REs for a CSI-RS antenna port in a subband smaller than the threshold.
  • the UE 102 may expect or assume that number of REs for a CSI-RS antenna port in a subband for subband CSI feedback should be greater than or equal to the threshold.
  • the UE 102 may skip or refrain from reporting the CSI for a subband if number of REs for a CSI-RS antenna port in a subband smaller than the threshold.
  • the UE 102 may skip or refrain from reporting the whole CSI (i.e., wideband CSI and subband CSI) if the number of REs for a CSI-RS antenna port in a subband smaller than the threshold.
  • the UE 102 reports the subband CSI for the subband (s) with number of REs for any CSI-RS antenna port in a subband greater than or equal to the threshold.
  • the threshold may be pre-determined or pre-specified in standard. In some other examples, the threshold may be determined based on UE capability.
  • the network entity 104 transmits different CDM groups for a CSI-RS resource in different slots. In some examples, the network entity 104 transmits a CSI-RS resource repeatedly in different slots with different CDM groups applied respectively. In some implementations, the network entity 104 may configure the number of slots T for a CSI-RS resource or CSI-RS resource set. The network entity 104 further configures the starting symbol index within each slot for each CDM group. In some examples, the starting symbol index within each slot for each CDM group are the same, where the network entity 104 may configure (only) one starting symbol index. In some other examples, the starting symbol index within each slot for each CDM group are different, where the network entity 104 may configure multiple starting symbol index for each slot.
  • the network entity 104 transmits the CSI-RS resource with the same number of CDM groups in each configured T slots.
  • the network entity 104 and UE determine the number of CDM groups in each slot based on the total number of CDM groups and the number of configured slots.
  • the network entity 104 may configure the CSI-RS in T consecutive slots.
  • the number of CDM groups in the first slot is and the number of CDM groups in other configured slot is where N CDM indicates the number of CDM groups.
  • FIG. 7 describes an example 700 of CSI-RS transmission from 128 ports with the FD density of 0.5 based on 8 CDM groups in each of the 2 configured slots according to an embodiment
  • FIG. 8 illustrates an example 800 of CSI-RS transmission from the 128 antenna ports with the FD density of 0.5 based on the configured slot index and symbol index in 2 slots according to an embodiment.
  • the network entity 104 may transmit the CSI-RS with different number of the CDM groups in each of the configured slots allocated for the CSI-RS. Referring to FIG, 8, for example, RB 802 indicates RB with CSI-RS and RB 804 indicates RB without CSI-RS.
  • the network entity 104 may transmit the CSI-RS with 12 CDM groups 810A in slot 812A and 4 CDM groups 810B in slot 812B.
  • the network entity 104 may configure the slot index within the configured slots and symbol index for each CDM group. In one example, the network entity 104 transmits a CSI-RS instance by or across 2 slots and configures whether the CSI-RS port or a CDM group is in the first slot or second slot.
  • FIG. 8 describes an example 800 for the 128 ports CSI-RS with the FD density of 0.5 based on the configured slot index and symbol index in 2 slots according to an embodiment
  • FIGs. 9-10 illustrate examples 900 and 1000 of a cyclic mapping and a sequential mapping for the CSI-RS with multiple repetitions, respectively, according to an embodiment.
  • the network entity 104 may perform a cyclic mapping scheme.
  • the network entity 104 may transmit all the CDM groups from one repetition and then all the CDM groups from another repetition. For example, referring to FIG. 9, the network entity 104 may transmit CDM group 0-7 from one repetition in slot 902 and CDM group 8-15 from another repetition in slot 904.
  • the network entity 104 may perform a sequential mapping scheme for the CSI-RS with multiple repetitions. For example, the network entity 104 transmit the CDM groups corresponding to the first slot for all repetitions, and then the CDM groups corresponding to the second slot for all repetitions. Referring to FIG. 10, the network entity 104 transmits the CDM group 0-7 corresponding to the first slot 1002 for all repetitions, and then the CDM group 8-15 corresponding to the second slot 1004 for all repetitions. Alternatively, the network entity may configure whether to transmit the multi-slot and multi-repetition based CSI-RS by sequential mapping or cyclic mapping scheme.
  • the network entity 104 configures common RBs for the CDM groups in each slot. In some other implementations, the network entity 104 may configure different RBs for the CDM groups in different slots. In one example, the network entity 104 may configure separate RB location, for example, odd RB or even RB, for the CDM groups in each slot. In another example, the network entity 104 may configure whether to enable the frequency hopping. If the frequency hopping is enabled, the network entity 104 may transmit the CDM groups in different slot based on the configured RBs for the first configured slot, the slot index within the configured slots, and the frequency domain density.
  • the network entity 104 transmits the CDM groups in the odd RBs in the first configured slot
  • the network entity 104 transmits the CDM groups in the even RBs in the second configured slot.
  • the network entity 104 may configure the frequency hopping per CDM group or a subset of CDM groups or all CDM groups.
  • the network entity may transmit one CDM group across two slots. In some other implementations, the network entity may transmit one CDM group within one slot, and the network entity refrains from transmitting one CDM group across two slots. Thus, the UE shall not expect the network entity schedule the CSI-RS with one CDM group across two slots. In some other implementations, the UE may report the UE capability indicating whether it supports one CDM group across two slots.
  • FIGs. 9-10 describes examples 900 and 1000 of a cyclic mapping and a sequential mapping for the CSI-RS with multiple repetitions, respectively, according to an embodiment
  • FIG. 11 illustrates an example of CSI measurement by receiving the CSI-RS in available slots according to an embodiment.
  • the UE measures the CSI based on the CSI-RS in the configured slots.
  • the UE 102 may refrain from transmitting the CSI report.
  • the UE 102 may transmit the CSI report based on an outdated CSI, for example, the CSI measured from the last CSI-RS instance or reported in the last CSI report.
  • the UE 102 may transmit the CSI report based on the remaining antenna ports for the CSI-RS.
  • the UE 102 may transmit the CSI report based on the remaining antenna ports for the CSI-RS and the dropped antenna ports from the most recent CSI-RS transmission.
  • the network entity 104 may transmit the CSI-RS in the next available slot. Then, the UE 102 measures and reports CSI based on the received CSI-RS in the corresponding slots. Referring to FIG. 11, the CSI-RS 1102 collides with an uplink signal 1104 in a slot 1106. By applying collision handling technique, the network entity 104 transmits the CSI-RS 1102A in one of the available configured slots 1108.
  • the network entity 104 may transmit a triggering signal for aperiodic CSI-RS for transmitting the dropped parts of the CSI-RS.
  • the network entity 104 may further indicate association between the triggered CSI-RS and the available parts of the CSI-RS in the triggering signal. Then, the UE 102 measures and reports CSI-RS based on the triggered CSI-RS in the corresponding slots.
  • FIG. 11 illustrates an example 1100 of CSI measurement by receiving the CSI-RS in available slots according to an embodiment
  • FIG. 12 illustrates an example 1200 of shared CSI-RS for the UEs with different capabilities according to an embodiment.
  • the network entity 104 transmits the CSI-RS to multiple UEs. As different UEs may have different capability of supported maximum number of CSI-RS ports, the network entity 104 may transmit the CSI-RS based on a port indexing scheme that the first K (K ⁇ N p ) ports for the CSI-RS corresponds to a first codebook configuration for a first UE (e.g., UE 1) and all the N p antenna ports for the CSI-RS corresponds to a second codebook configuration for the second UE (e.g., UE 2) .
  • a port indexing scheme that the first K (K ⁇ N p ) ports for the CSI-RS corresponds to a first codebook configuration for a first UE (e.g., UE 1) and all the N p antenna ports for the CSI-RS corresponds to a second codebook configuration for the second UE (e.g., UE 2) .
  • the network entity 104 configures a CSI-RS resource with N p antenna ports for the first and second UEs, and also configures at least one of the parameters: the number of measured antenna ports, the number of measured antenna ports in the horizontal and vertical respectively, the number of actual antenna ports in the horizontal and vertical respectively, or the measured antenna ports indexes for a UE.
  • the UE 102 determines the antenna ports for the CSI measurement based on the configuration and measures the CSI based on the determined antenna ports.
  • the network entity 104 may configure the number of measured antenna ports as 16 ports 1204 for the first UE (e.g., UE 1) .
  • the network entity 104 further configures the number of measured horizontal antenna ports as 4 and the number of measured vertical antenna ports as 2 in the codebook configuration based on the 16 antenna ports.
  • the network entity 104 configure the number of measured antenna ports as 64 ports 1202 for the second UE (e.g., UE 2) .
  • the network entity 104 also configures the number of horizontal antenna ports as 8 and number of vertical antenna ports as 4 in the codebook configuration based on 64 antenna ports.
  • the UE 1 measures the CSI based on the first 4 horizontal antenna ports and the first 2 vertical antenna ports from 2 polarizations (e.g., 16 ports) .
  • the UE 2 measures the CSI based on the 8 horizontal antenna ports and the 4 vertical antenna ports from 2 polarizations (e.g., 64 ports) .
  • the CSI-RS transmitted from the 16 ports may be shared by the UE 1 and UE 2.
  • FIG. 12 illustrates an example 1200 of shared CSI-RS for the UEs with different capabilities according to an embodiment
  • FIG. 13 illustrates an example 1300 for block-wise port indexing compared to per CSI-RS resource port indexing.
  • the antenna ports for a CSI-RS resource may be divided into several blocks, and the port indexing is performed starting from the antenna ports within the first block and the antenna ports within the next block (s) .
  • the port indexing is performed starting from the antenna ports in the first column and the antenna ports in the next column (s) .
  • per CSI-RS resource port indexing can be the same as the block-wise port indexing when the number of blocks is 1.
  • the network entity 104 configures a first K ports CSI-RS resource for the first UE and a second N p antenna ports CSI-RS resource for the second UE, where the network entity 104 transmits the first CSI-RS resource on the same K ports as K ports of N p antenna ports for the second CSI-RS resource in the same REs with the same signal.
  • the network entity 104 configures the same scrambling identifier (ID) for both CSI-RS resources. Referring to an example 1300 of FIG.
  • the network entity 104 configures a first 16 ports CSI-RS resource 1304 for the first UE (e.g., UE 1) and a second 64 antenna ports CSI-RS resource 1302 for the second UE (e.g., UE 2) .
  • the network entity 104 transmits the second CSI-RS resource based on a block-wise antenna port indexing.
  • the network entity 104 and the UE 102 performs the antenna port indexing for each block of K ports CSI-RS.
  • the network entity 104 configures at least one of the parameters for the block-wise antenna port indexing: the number of antenna ports of each antenna port block; the number of antenna port block; or the number of horizontal antenna ports and the number of vertical antenna ports per block.
  • the network entity 104 may configure the port indexing scheme, for example, whether the port indexing is based on the per CSI-RS resource port indexing scheme (1306) or the block-wise port indexing scheme (1308) . Referring to FIG.
  • the network entity 104 transmits the second CSI-RS resource based on a block-wise antenna port indexing 1308.
  • the network entity 104 and the UE 102 performs the antenna port indexing for a block 1308.
  • the network entity 104 configures 16 ports based on the block-wise port indexing scheme.
  • FIG. 13 illustrates an example 1300 for block-wise port indexing compared to per CSI-RS resource port indexing
  • FIGs. 14-15 illustrate examples 1400, 1500 for the multiple CSI-RS resources based CSI measurement.
  • the network entity 104 may configure 1 CSI-RS resource with K antenna ports for the first UE and M with different antenna ports for different resources.
  • the network entity 104 configures CSI-RS resource 1404 with 16 antenna ports for the first UE (e.g., UE 1) and CSI-RS resource 1402 with 64 antenna ports for the second UE (e.g., UE 2) .
  • the network entity 104 transmits the M CSI-RS resources across the N p antenna ports.
  • the network entity 104 configures N p /K CSI-RS resources with K antenna ports for each resource.
  • the network entity 104 configures different number of antenna ports for different CSI-RS resources.
  • the network entity 104 transmits one of the M CSI-RS resources based on the same transmission behavior as the CSI-RS resource configured for the first UE.
  • the network entity 104 configures four CSI-RS resources (e.g., CSI-RS resource 1 1406A, CSI-RS resource 2 1406B, CSI-RS resource 3 1406C, CSI-RS resource 4 1406D) with an equal number of ports (e.g., 16 ports) in each resource.
  • the network entity 104 transmits CSI-RS resource 1 1406A based on the same transmission behavior as the CSI-RS resource 1404 configured for the first UE (e.g., UE 1) . Referring to an example 1500 of FIG.
  • the network entity 104 configures CSI-RS resource 1504 with 16 antenna ports for the first UE (e.g., UE 1) and CSI-RS resource 1502 with 64 antenna ports for the second UE (e.g., UE 2) .
  • the network entity 104 configures two CSI-RS resources (e.g., CSI-RS resource 1 1506A, CSI-RS resource 2 1506B) with a different number of ports in each resource.
  • CSI-RS resource 1 1506A has 16 ports and CSI-RS resource 2 1506B has 48 ports.
  • the network entity 104 transmits CSI-RS resource 1 1506A based on the same transmission behavior as the CSI resource 1504 configured for the first UE (e.g., UE 1) .
  • the network entity 104 configures the same value for the M CSI-RS resources for at least one of the parameters: bandwidth, subcarriers, periodicity, transmission configuration indicator (TCI) state, symbols, CDM groups, CDM types, frequency domain density, and power offset between the CSI-RS and physical downlink shared channel (PDSCH) .
  • the UE 102 shall expect the network entity 104 configures the same value for the M CSI- RS resources for at least one of the parameters: bandwidth, subcarriers, periodicity, TCI state, symbols, CDM groups, CDM types, FD density, and power offset between the CSI-RS and PDSCH.
  • the network entity 104 configures the number of horizontal antenna ports and vertical antenna ports for each of the M CSI-RS resources and configures the codebook based on N p antenna ports.
  • the network entity 104 may configure the antenna ports multiplexing order in the N p antenna ports for the configured CSI-RS resources.
  • the network entity 104 may configure the number of horizontal CSI-RS resources and number of vertical resources, and the network entity 104 configures the vertical and horizontal location for each CSI-RS resource by configuring the vertical resource index and horizontal resource index. Then, the UE 102 can determine the number of horizontal antenna ports and vertical antenna ports for the N p antenna ports, and the location for the antenna ports for each CSI-RS resource, and calculates the CSI based on the configured codebook.
  • the network entity 104 configures the number of horizontal antenna ports and vertical antenna ports for the N p antenna ports, and configures the antenna port index for each antenna port for each of the M CSI-RS resource. Then, the UE 102 can determine the location for the antenna ports for each CSI-RS resource, and calculates the CSI based on the configured codebook. In one example, the network entity 104 configures a N p bits bitmap for each CSI-RS resource, where the first state of bit x indicates the antenna port x from the N p antenna ports is not transmitted in this CSI-RS resource and the second state of bit x indicates the antenna port x from the N p antenna ports is transmitted in this CSI-RS resource. The opposite operation of the first and second state of bit x may be also as another example.
  • FIGs. 2-15 illustrate aspects of CSI report based on CSI-RS with overhead reduction techniques.
  • FIGs. 16-17 show methods for implementing one or more aspects of FIGs. 2-15.
  • FIG. 16 shows an implementation by the UE 102 of the one or more aspects of FIGs. 2-15.
  • FIG. 17 shows an implementation by the network entity 104 of the one or more aspects of FIGs. 2-15.
  • FIG. 16 illustrates a flowchart 1600 of a method of wireless communication at a UE.
  • the method may be performed by the UE 102.
  • the UE 102 may transmit 1602, to the network entity 104, a UE capability report.
  • the UE 102 may transmit 302, to the network entity 104, a UE capability for supporting resource mapping patterns with CSI-RS overhead reduction.
  • the UE capability report indicating at least one of: a supported FD density for the CSI-RS, a supported FDM scheme for the CDM groups for the CSI-RS, a supported TDM scheme for the CDM groups for the CSI-RS, a supported FD-OCC length, a supported TD-OCC length, a minimum number of REs per antenna port per subband for a PM, or a minimum number of REs per antenna port per subband for a CQI.
  • the UE 102 may receive 1604, from the network entity 104, a configuration for at least one of: the CSI report, the CMR associated with the resource mapping pattern, or a subband size for the CSI-RS.
  • the UE 102 may receive 304 from the network entity 104 RRC configuration enabling resource mapping patterns with CSI-RS overhead reduction and/or configuring a subband size.
  • the UE 102 may receive 1606, from the network entity 104, a triggering indication for the CSI report. For example, referring to FIG. 3, UE 102 may receive 306 from the network entity 104 a MAC CE or a DCI activating or triggering the CSI report. For semi-persistent CSI-RS or aperiodic CSI-RS, the network entity 104 may transmit the MAC CE or the DCI activating or triggering the CSI-RS.
  • the UE 102 receives 1608, from the network entity 104, a CSI-RS on a CMR, configured based on a resource mapping pattern associated with a number of antenna ports for the CSI-RS being at or above a threshold level. For example, referring to FIG. 3, the UE 102 receives 308, from the network entity 104, CSI-RS resources based on the configured resource mapping pattern. The UE 102 measures CSI based on the received CSI-RS resources. The UE 102 may further determine the CSI for each subband based on the configured subband size.
  • the UE 102 receives 1608A, from the network entity 104, the CSI-RS based on different CDM groups for the CSI-RS located in different RBs (e.g., see FIGs. 4, 5, and 6) .
  • the UE 102 receives 1608B, from the network entity 104, the CSI-RS based on different CDM groups for the CSI-RS located in different slots (e.g., see FIGs. 7, 8, 9, and 10) .
  • the UE 102 receives 1608C, from the network entity 104, on the CMR, the common CSI-RS (e.g., see FIGs. 12, 13, 14, and 15) .
  • the UE 102 transmits 1610, to the network entity 104, a CSI report including measurement information associated with the resource mapping pattern of the CSI-RS. For example, referring to FIG. 3, the UE 102 transmits 310, to the network entity 104, a CSI report based on the CSI-RS and CSI report configuration via PUSCH or PUCCH.
  • FIG. 16 describes a method from a UE-side of a wireless communication link
  • FIG. 17 describes a method from a network-side of the wireless communication link.
  • FIG. 17 is a flowchart 1700 of a method of wireless communication at a network entity.
  • the method may be performed by one or more network entities 104, which may correspond to a base station or a unit of the base station, such as the RU 106, the DU 108, and/or the CU 110.
  • the network entity 104 may receive 1702, from the UE 102 a UE capability report.
  • the network entity 104 may receive 302, from the UE 4, a UE capability for supporting resource mapping patterns with CSI-RS overhead reduction.
  • the UE capability report indicating at least one of: a supported FD density for the CSI-RS, a supported FDM scheme for the CDM groups for the CSI-RS, a supported TDM scheme for the CDM groups for the CSI-RS, a supported FD-OCC length, a supported TD-OCC length, a minimum number of REs per antenna port per subband for a PM, or a minimum number of REs per antenna port per subband for a CQI.
  • the network entity 104 may transmit 1704 to the UE 102, a configuration for at least one of: the CSI report, the CMR associated with the resource mapping pattern, or a subband size for the CSI-RS.
  • the network entity 104 may transmit 304 UE 102 to the UE 102 104 RRC configuration enabling resource mapping patterns with CSI-RS overhead reduction and/or configuring a subband size.
  • the network entity 104 may transmit 1706, to the UE 102, a triggering indication for the CSI report. For example, referring to FIG. 3, network entity 104 may transmit 306 to the UE 102 a MAC CE or a DCI activating or triggering the CSI report. For semi-persistent CSI-RS or aperiodic CSI-RS, the network entity 104 may transmit the MAC CE or the DCI activating or triggering the CSI-RS.
  • the network entity 104 transmits 1708, to a UE 102, a CSI-RS on a CMR configured based on a resource mapping pattern associated with a number of antenna ports for the CSI-RS being at or above a threshold level. For example, referring to FIG. 3, the network entity 104 transmits 308, to the UE 102, CSI-RS resources based on the configured resource mapping pattern. The UE 102 measures CSI based on the received CSI-RS resources. The UE 102 may further determine the CSI for each subband based on the configured subband size.
  • the network entity 104 transmits 1708A, to a UE 102, the CSI-RS based on different code division multiplexing, CDM, groups for the CSI-RS located in different RBs (e.g., see FIGs. 4, 5, and 6) .
  • the network entity 104 transmits 1708B, to a UE 102, the CSI-RS based on different code division multiplexing, CDM, groups for the CSI-RS located in different slots (e.g., see FIGs. 7, 8, 9, and 10) .
  • the network entity 104 transmits 1708C, to a plurality of UEs including the UE 102, a common CSI-RS shared by the plurality of UEs (e.g., see FIGs. 12, 13, 14, and 15) .
  • the network entity 104 receives 1710, from the UE 102, a CSI report including measurement information associated with the resource mapping pattern of the CSI-RS. For example, referring to FIG. 3, the network entity 104, receives from the UE 102 a CSI report based on the CSI-RS and CSI report configuration via PUSCH or PUCCH.
  • a UE apparatus 1802 may perform the method of flowchart 1600.
  • the one or more network entities 104 may perform the method of flowchart 1700.
  • FIG. 18 is a diagram 1800 illustrating an example of a hardware implementation for a UE apparatus 1802.
  • the UE apparatus 1802 may be the UE 102, a component of the UE 102, or may implement UE functionality.
  • the UE apparatus 1802 may include an application processor 1806, which may have on-chip memory 1806’.
  • the application processor 1806 may be coupled to a secure digital (SD) card 1808 and/or a display 1810.
  • the application processor 1806 may also be coupled to a sensor (s) module 1812, a power supply 1814, an additional module of memory 1816, a camera 1818, and/or other related components.
  • SD secure digital
  • the UE apparatus 1802 may further include a wireless baseband processor 1826, which may be referred to as a modem.
  • the wireless baseband processor 1826 may have on-chip memory 1826'.
  • the wireless baseband processor 1826 may also be coupled to the sensor (s) module 1812, the power supply 1814, the additional module of memory 1816, the camera 1818, and/or other related components.
  • the wireless baseband processor 1826 may be additionally coupled to one or more subscriber identity module (SIM) card (s) 1820 and/or one or more transceivers 1830 (e.g., wireless RF transceivers) .
  • SIM subscriber identity module
  • the UE apparatus 1802 may include a Bluetooth module 1832, a WLAN module 1834, an SPS module 1836 (e.g., GNSS module) , and/or a cellular module 1838.
  • the Bluetooth module 1832, the WLAN module 1834, the SPS module 1836, and the cellular module 1838 may each include an on-chip transceiver (TRX) , or in some cases, just a transmitter (TX) or just a receiver (RX) .
  • TRX on-chip transceiver
  • the Bluetooth module 1832, the WLAN module 1834, the SPS module 1836, and the cellular module 1838 may each include dedicated antennas and/or utilize antennas 1840 for communication with one or more other nodes.
  • the UE apparatus 1802 can communicate through the transceiver (s) 1830 via the antennas 1840 with another UE (e.g., sidelink communication) and/or with a network entity 104 (e.g., uplink/downlink communication) , where the network entity 104 may correspond to a base station or a unit of the base station, such as the RU 106, the DU 108, or the CU 110.
  • another UE e.g., sidelink communication
  • a network entity 104 e.g., uplink/downlink communication
  • the network entity 104 may correspond to a base station or a unit of the base station, such as the RU 106, the DU 108, or the CU 110.
  • the wireless baseband processor 1826 and the application processor 1806 may each include a computer-readable medium /memory 1826', 1806', respectively.
  • the additional module of memory 1816 may also be considered a computer-readable medium /memory.
  • Each computer-readable medium /memory 1826', 1806', 1816 may be non-transitory.
  • the wireless baseband processor 1826 and the application processor 1806 may each be responsible for general processing, including execution of software stored on the computer-readable medium /memory 1826', 1806', 1816.
  • the software when executed by the wireless baseband processor 1826 /application processor 1806, causes the wireless baseband processor 1826 /application processor 1806 to perform the various functions described herein.
  • the computer-readable medium /memory may also be used for storing data that is manipulated by the wireless baseband processor 1826 /application processor 1806 when executing the software.
  • the wireless baseband processor 1826 /application processor 1806 may be a component of the UE 102.
  • the UE apparatus 1802 may be a processor chip (e.g., modem and/or application) and include just the wireless baseband processor 1826 and/or the application processor 1806. In other examples, the UE apparatus 1802 may be the entire UE 102 and include the additional modules of the apparatus 1802.
  • the report component 140 is configured to receive, from the network entity, a CSI-RS on a CMR configured based on a resource mapping pattern associated with a number of antenna ports for the CSI-RS being at or above a threshold level; transmit, to the network entity, a CSI report including measurement information associated with the resource mapping pattern of the CSI-RS.
  • the report component 140 may be within the application processor 1806 (e.g., at 140a) , the wireless baseband processor 1826 (e.g., at 140b) , or both the application processor 1806 and the wireless baseband processor 1826.
  • the report component 140a-140b may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by one or more processors configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by the one or more processors, or a combination thereof.
  • FIG. 19 is a diagram 1900 illustrating an example of a hardware implementation for one or more network entities 104.
  • the one or more network entities 104 may be a base station, a component of a base station, or may implement base station functionality.
  • the one or more network entities 104 may include, or may correspond to, at least one of the RU 106, the DU, 108, or the CU 110.
  • the CU 110 may include a CU processor 1946, which may have on-chip memory 1946'.
  • the CU 110 may further include an additional module of memory 1956 and/or a communications interface 1948, both of which may be coupled to the CU processor 1946.
  • the CU 110 can communicate with the DU 108 through a midhaul link 162, such as an F1 interface between the communications interface 1948 of the CU 110 and a communications interface 1928 of the DU 108.
  • the DU 108 may include a DU processor 1926, which may have on-chip memory 1926'. In some aspects, the DU 108 may further include an additional module of memory 1936 and/or the communications interface 1928, both of which may be coupled to the DU processor 1926.
  • the DU 108 can communicate with the RU 106 through a fronthaul link 160 between the communications interface 1928 of the DU 108 and a communications interface 1908 of the RU 106.
  • the RU 106 may include an RU processor 1906, which may have on-chip memory 1906'. In some aspects, the RU 106 may further include an additional module of memory 1916, the communications interface 1908, and one or more transceivers 1930, all of which may be coupled to the RU processor 1906. The RU 106 may further include antennas 1940, which may be coupled to the one or more transceivers 1930, such that the RU 106 can communicate through the one or more transceivers 1930 via the antennas 1940 with the UE 102.
  • the on-chip memory 1906', 1926', 1946' and the additional modules of memory 1916, 1936, 1956 may each be considered a computer-readable medium /memory. Each computer-readable medium /memory may be non-transitory. Each of the processors 1906, 1926, 1946 is responsible for general processing, including execution of software stored on the computer-readable medium /memory. The software, when executed by the corresponding processor (s) 1906, 1926, 1946 causes the processor (s) 1906, 1926, 1946 to perform the various functions described herein.
  • the computer-readable medium /memory may also be used for storing data that is manipulated by the processor (s) 1906, 1926, 1946 when executing the software.
  • the configuration component 150 may sit at any of the one or more network entities 104, such as at the CU 110; both the CU 110 and the DU 108; each of the CU 110, the DU 108, and the RU 106; the DU 108; both the DU 108 and the RU 106; or the RU 106.
  • the configuration component 150 is configured to transmit, to a UE 102, a CSI-RS on a CMR configured based on a resource mapping pattern associated with a number of antenna ports for the CSI-RS being at or above a threshold level; and receive, from the UE 102, a CSI report including measurement information associated with the resource mapping pattern of the CSI-RS.
  • the configuration component 150 may be within one or more processors of the one or more network entities 104, such as the RU processor 1906 (e.g., at 150a) , the DU processor 1926 (e.g., at 150b) , and/or the CU processor 1946 (e.g., at 150c) .
  • the configuration component 150a-150c may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by one or more processors 1906, 1926, 1946 configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by the one or more processors 1906, 1926, 1946, or a combination thereof.
  • processors include microprocessors, microcontrollers, graphics processing units (GPUs) , central processing units (CPUs) , application processors, digital signal processors (DSPs) , reduced instruction set computing (RISC) processors, systems-on-chip (SoC) , baseband processors, field programmable gate arrays (FPGAs) , programmable logic devices (PLDs) , state machines, gated logic, discrete hardware circuits, and other similar hardware configured to perform the various functionality described throughout this disclosure.
  • GPUs graphics processing units
  • CPUs central processing units
  • DSPs digital signal processors
  • RISC reduced instruction set computing
  • SoC systems-on-chip
  • FPGAs field programmable gate arrays
  • PLDs programmable logic devices
  • One or more processors in the processing system may execute software, which may be referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, or any combination thereof.
  • Computer-readable media includes computer storage media and can include a random-access memory (RAM) , a read-only memory (ROM) , an electrically erasable programmable ROM (EEPROM) , optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of these types of computer-readable media, or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.
  • Storage media may be any available media that can be accessed by a computer.
  • aspects, implementations, and/or use cases described herein may be implemented across many differing platform types, devices, systems, shapes, sizes, and packaging arrangements.
  • the aspects, implementations, and/or use cases may come about via integrated chip implementations and other non-module-component based devices, such as end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail/purchasing devices, medical devices, artificial intelligence (AI) -enabled devices, machine learning (ML) -enabled devices, etc.
  • the aspects, implementations, and/or use cases may range from chip-level or modular components to non-modular or non-chip-level implementations, and further to aggregate, distributed, or original equipment manufacturer (OEM) devices or systems incorporating one or more techniques described herein.
  • OEM original equipment manufacturer
  • Devices incorporating the aspects and features described herein may also include additional components and features for the implementation and practice of the claimed and described aspects and features.
  • transmission and reception of wireless signals necessarily includes a number of components for analog and digital purposes, such as hardware components, antennas, RF-chains, power amplifiers, modulators, buffers, processor (s) , interleavers, adders/summers, etc.
  • Techniques described herein may be practiced in a wide variety of devices, chip-level components, systems, distributed arrangements, aggregated or disaggregated components, end-user devices, etc., of varying configurations.
  • “may” refers to a permissible feature that may or may not occur
  • “might” refers to a feature that probably occurs
  • “can” refers to a capability (e.g., capable of) .
  • the phrase “For example” often carries a similar connotation to “may” and, therefore, “may” is sometimes excluded from sentences that include “for example” or other similar phrases.
  • Combinations such as “at least one of A, B, or C” or “one or more of A, B, or C” include any combination of A, B, and/or C, such as A and B, A and C, B and C, or A and B and C, and may include multiples of A, multiples of B, and/or multiples of C, or may include A only, B only, or C only.
  • Sets should be interpreted as a set of elements where the elements number one or more.
  • Terms or articles such as “a” , “an” , and/or “the” may refer to one of an item, feature, element, etc., that the term or article precedes, or may refer to more than one of said item, feature, element, etc. that the term or article precedes.
  • the recitation “a widget” does not preclude reference to multiples of said widget, as “multiple widgets” necessarily includes “a widget” .
  • the recitation “a widget” may be interpreted as “at least one widget” or, similarly, interpreted as “one or more widgets” .
  • ordinal terms such as “first” and “second” do not necessarily imply an order in time, sequence, numerical value, etc., but are used to distinguish between different instances of a term or phrase that follows each ordinal term.
  • Example 1 is a method of wireless communication at a UE, including: receiving, from a network entity, a CSI-RS on a CMR configured based on a resource mapping pattern associated with a number of antenna ports for the CSI-RS being at or above a threshold level; and transmitting, to the network entity, a CSI report including measurement information associated with the resource mapping pattern of the CSI-RS.
  • Example 2 may be combined with Example 1 and further includes receiving, from the network entity, a configuration for at least one of: the CSI report, the CMR associated with the resource mapping pattern, or a subband size for the CSI-RS.
  • Example 3 may be combined with any of Examples 1-2 and further includes that the resource mapping pattern is based on at least one of: a first reduction of CSI-RS resources in frequency-domain, a second reduction of CSI-RS resources in time-domain, or the CSI-RS being associated with a common CSI-RS shared by a plurality of UEs including the UE.
  • Example 4 may be combined with Example 3 and further includes that the first reduction of the CSI-RS resources in the frequency-domain includes: receiving, from the network entity, the CSI-RS based on different CDM groups for the CSI-RS located in different RBs.
  • Example 5 may be combined with Example 4 and further includes that the measurement information includes: CSI for the subband based on a number of REs for each antenna port for the CSI-RS being greater than or equal to a predetermined number.
  • Example 6 may be combined with Example 3 and further includes that the second reduction of the CSI-RS resources in the time-domain includes: receiving, from the network entity, the CSI-RS based on different CDM groups for the CSI-RS located in different slots.
  • Example 7 may be combined with Example 6 and further includes that the measurement information is based on the CSI-RS located in the different slots.
  • Example 8 may be combined with Example 3 and further includes that the receiving, from the network entity, the CSI-RS includes: receiving, on the CMR, the common CSI-RS.
  • Example 9 may be combined with any of Examples 1-8 and further includes that the receiving the CSI-RS on the CMR is based on at least one of: the CMR being associated with the predetermined number of antenna ports, a first number of measured antenna ports in a horizontal direction, a second number of measured antenna ports in a vertical direction, a third number of total antenna ports in the horizontal direction, a fourth number of total antenna ports in the vertical direction, or an antenna ports index.
  • Example 10 may be combined with Example 9 and further includes that the CMR for the receiving the CSI-RS is a subset of CMRs associated with the CSI-RS.
  • Example 11 may be combined with any of Examples 1-10 and further includes transmitting, to the network entity, a UE capability report indicating at least one of: a supported FD density for the CSI-RS, a supported FDM scheme for the CDM groups for the CSI-RS, a supported TDM scheme for the CDM groups for the CSI-RS, a supported FD-OCC length, a supported TD-OCC length, a minimum number of REs per antenna port per subband for a PMI or a minimum number of REs per antenna port per subband for a CQI.
  • a UE capability report indicating at least one of: a supported FD density for the CSI-RS, a supported FDM scheme for the CDM groups for the CSI-RS, a supported TDM scheme for the CDM groups for the CSI-RS, a supported FD-OCC length, a supported TD-OCC length, a minimum number of REs per antenna port per subband for a PMI or a minimum number of REs per
  • Example 12 may be combined with any of Examples 1-11 and further includes that the resource mapping pattern indicates at least one of: an RB index and a subcarrier in the RB for each of the CDM groups, a slot index and a starting symbol index within a slot for each of the CDM groups, an antenna port indexing scheme, a CDM length for each of the CDM groups, a CDM type for each of the CDM groups, or a subband size configuration based on the supported FD density of the CMR.
  • the resource mapping pattern indicates at least one of: an RB index and a subcarrier in the RB for each of the CDM groups, a slot index and a starting symbol index within a slot for each of the CDM groups, an antenna port indexing scheme, a CDM length for each of the CDM groups, a CDM type for each of the CDM groups, or a subband size configuration based on the supported FD density of the CMR.
  • Example 13 may be combined with any of Examples 1-12 and further includes receiving, from the network entity, a triggering indication for the CSI report.
  • Example 14 is a method of wireless communication at a UE, including: transmitting, to a user equipment, a CSI-RS on a CMR configured based on a resource mapping pattern associated with a number of antenna ports for the CSI-RS being at or above a threshold level; and receiving, from the UE, a CSI report including measurement information associated with the resource mapping pattern of the CSI-RS.
  • Example 15 may be combined with Example 14 and further includes transmitting, to the UE, a configuration for at least one of: the CSI report, the CMR associated with the resource mapping pattern, or a size of a subband for the CSI-RS.
  • Example 16 may be combined with any of Examples 14-15 and further include that the resource mapping pattern reduces the overhead of the CSI-RS based on at least one of: a first reduction of CSI-RS resources in frequency-domain, a second reduction of CSI-RS resources in time-domain, or the CSI-RS being a common CSI-RS to a plurality of UEs including the UE.
  • Example 17 may be combined with Example 16 and further includes that the transmitting the CSI-RS includes transmitting, to the UE, the CSI-RS based on different CDM groups for the CSI-RS located in different RBs.
  • Example 18 may be combined with Example 17 and further includes that the measurement information includes: CSI for the subband based on a number of REs for each antenna port for the CSI-RS being greater than or equal to a predetermined number.
  • Example 19 may be combined with any of Examples 14-18 and further includes that the transmitting the CSI-RS includes: transmitting, to the UE, the CSI-RS based on different CDM groups for the CSI-RS located in different slots.
  • Example 20 may be combined with Example 19 and further includes that the measurement information is based on the CSI-RS being in the different slots.
  • Example 21 may be combined with any of Examples 14-20 and further includes that the transmitting the CSI-RS includes: transmitting, to a plurality of UEs including the UE, a common CSI-RS shared by the plurality of UEs.
  • Example 22 may be combined with any of Examples 14-21 and further includes that the receiving the CSI-RS on the CMR is based on at least one of: the CMR being associated with the predetermined number of antenna ports, a first number of measured antenna ports in a horizontal direction, a second number of measured antenna ports in a vertical direction, a third number of total antenna ports in the horizontal direction, a fourth number of total antenna ports in the vertical direction, or an antenna ports index.
  • Example 23 may be combined with Example 22 and further includes that the configuration configures a first number of antenna ports for a first UE and a second number of antenna ports for a second UE.
  • Example 24 may be combined with Example 22 and further includes that the configuration further configures at least one of: the CMR with K antenna ports for the first UE, or a predetermined number of CMR with different antenna ports.
  • Example 25 may be combined with any of Examples 1-24 and further includes: receiving, from the UE, a UE capability report indicating at least one of: a supported FD density for the CSI-RS, a supported FDM scheme for the CDM groups for the CSI-RS, a supported TDM scheme for the CDM groups for the CSI-RS, a supported FD-OCC length, a supported TD-OCC length, a minimum number of REs per antenna port per subband for a PMI or a minimum number of REs per antenna port per subband for a CQI.
  • a UE capability report indicating at least one of: a supported FD density for the CSI-RS, a supported FDM scheme for the CDM groups for the CSI-RS, a supported TDM scheme for the CDM groups for the CSI-RS, a supported FD-OCC length, a supported TD-OCC length, a minimum number of REs per antenna port per subband for a PMI or a minimum number of REs per
  • Example 26 may be combined with any of Examples 14-25 and further includes transmitting to another UE, another CSI-RS on another CMR configured based on another resource mapping pattern associated with a number of antenna ports for the another CSI-RS being below the threshold value.
  • Example 27 is an apparatus for wireless communication for implementing a method as in any of examples 1-26.
  • Example 28 is an apparatus for wireless communication including means for implementing a method as in any of examples 1-26.
  • Example 29 is a non-transitory computer-readable medium storing computer executable code, the code when executed by a processor causes the processor to implement a method as in any of examples 1-26.

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

Abstract

La présente divulgation concerne des systèmes, des dispositifs, un appareil et des procédés, y compris des programmes informatiques codés sur des supports de stockage, pour une réduction de surdébit pour des CSI-RS comportant un grand nombre de ports d'antenne. Un UE reçoit (308), en provenance d'une entité de réseau (104), un CSI-RS sur une CMR configurée sur la base d'un motif de mappage de ressources associé à un nombre de ports d'antenne pour le CSI-RS qui est supérieur ou égal à un niveau seuil. L'UE (102) transmet (310), à l'entité de réseau (104), un rapport de CSI comprenant des informations de mesure associées au motif de mappage de ressources du CSI-RS.
PCT/CN2023/111881 2023-08-09 2023-08-09 Réduction de surdébit pour signal de référence d'informations d'état de canal comportant un grand nombre de ports d'antenne Pending WO2025030408A1 (fr)

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US20180262252A1 (en) * 2015-09-18 2018-09-13 Samsung Electronics Co., Ltd. Method and device for transmitting and receiving feedback signal in wireless communication system
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EP3425837A1 (fr) * 2016-04-01 2019-01-09 Samsung Electronics Co., Ltd. Procédé et appareil pour la coexistence de communications de dispositif à dispositif et de communications cellulaires dans un système de communication mobile

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