EP4677766A1

EP4677766A1 - Rank specific codebook for wireless communication

Info

Publication number: EP4677766A1
Application number: EP23725561.7A
Authority: EP
Inventors: Yushu Zhang
Original assignee: Google LLC
Current assignee: Google LLC
Priority date: 2023-04-07
Filing date: 2023-04-07
Publication date: 2026-01-14
Also published as: CN120958737A; WO2024207414A1

Abstract

This disclosure provides systems, devices, apparatus, and methods, including computer programs encoded on storage media, for beam measurement and report procedure. A user equipment (UE) (102) receives (304), from a network entity (104), a rank-specific channel state information (CSI) report configuration indicating rank-specific parameters for a CSI report. The UE (102) transmits (310), to the network entity (104), the CSI report including CSI measurement information for a channel state information-reference signal (CSI-RS), the CSI measurement information being associated with the rank-specific parameters.

Description

RANK SPECIFIC CODEBOOK FOR WIRELESS COMMUNICATION

TECHNICAL FIELD

The present disclosure relates generally to wireless communication, and more particularly, to rank specific channel state information (CSI) report configurations, such as for a rank specific codebook.

BACKGROUND

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 (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, to provide various telecommunication services (e.g., telephony, video, data, messaging, broadcasts, 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. Transmission of a channel state information (CSI) report may correspond to a single codebook configuration. For example, the UE can provide, to the network entity, the CSI report based on a single configuration of antenna ports.
BRIEF SUMMARY
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects. This summary neither identifies key or critical elements of all aspects nor delineates the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
A network entity, such as a base station or a unit of a base station, can configure channel state information (CSI) feedback using a CSI report configuration. The CSI report configuration configures a channel measure resource (CMR) , an interference measurement resource (IMR) , a codebook configuration, and/or an uplink resource for the CSI feedback. A user equipment (UE) measures a channel state information-reference signal (CSI-RS) and transmits the CSI feedback in a CSI report based on the CSI report configuration. The CSI report may include a CSI resource indicator (CRI) , a rank indicator (RI) , a precoder matrix indicator (PMI) , a channel quality indicator (CQI) , and/or a layer indicator (LI) .
In some implementations, transmission of the CSI report is based on a single codebook configuration. For example, the UE provides, to the network entity, the CSI based on a single configuration of antenna ports (N1, N2) . A UE near a cell edge may have a greater coupling loss than a UE near a cell center. Thus, the UE near the cell edge may have lower rank transmissions (e.g., rank 1 transmission) , which may be associated with a higher power allocation/more activated antenna ports at the network entity for sending a physical downlink shared channel (PDSCH) transmission to the UE. Furthermore, the UE near the cell center may have higher rank transmissions, which may require a reduced number of antenna ports for the PDSCH transmission. However, a single codebook configuration for the CSI report limits the UE to reporting the CSI based on the single configuration of antenna ports, such that the network entity may not be able to determine a more suitable number of the antenna ports to use for the PDSCH transmission.
Aspects of the present disclosure address the above-noted and other deficiencies by implementing a rank-specific codebook configuration procedure for a network entity to communicate with UEs on a rank-specific basis. In a first example, the UE may receive, from the network entity, a single configuration that jointly indicates a set of rank-specific parameters for the CSI report. In a second example, the UE receives, from the network entity, separate configurations for separate rank-specific parameters associated with the CSI report. The rank-specific codebook configuration procedure may provide improved accuracy for a CSI measurement and report to the network entity based on determining a more suitable number of antenna ports to use for PDSCH transmission.
According to some aspects, the UE receives, from the network entity, a rank-specific CSI report configuration indicating rank-specific parameters for a CSI report. The UE transmits, to the network entity, the CSI report including CSI measurement information for a CSI-RS, the CSI measurement information being associated with the rank-specific parameters.
According to some aspects, the network entity transmits, to the UE, a rank-specific CSI report configuration indicating rank-specific parameters for a CSI report. The network entity receives, from the UE, the CSI report including CSI measurement information for a CSI-RS, the CSI measurement information being associated with the rank-specific parameters.

BRIEF DESCRIPTION OF THE DRAWINGS

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.
FIG. 2A illustrates a diagram of a high-rank transmission.
FIG. 2B illustrates a diagram of low-rank transmission.
FIG. 3 illustrates a signaling diagram of an example scenario in which a UE and a network entity exchange messages and implement procedures for performing rank-specific configuration and report procedure, according to some embodiments.
FIG. 4 is a flowchart of a method of wireless communication at a UE.
FIG. 5 is a flowchart of a method of wireless communication at a network entity.
FIG. 6A illustrates an example for the configuration of rank-specific codebooks based on one codebook configuration.
FIG. 6B illustrates an example for the configuration of rank-specific codebooks based on a set of codebook configurations.
FIG. 6C illustrates an example for the CSI report based on the CSI report configuration with more than one codebook.
FIG. 7 illustrates an example for the port selection for the CSI measurement for the codebook with a reduced number of ports.
FIG. 8 illustrates an example for the CSI report based on a set of CSI-RSs and a set of codebooks and rank restrictions.
FIG. 9 illustrates an example for the CSI report based on multiple CSI report configurations.
FIG. 10 is a flowchart of a method of wireless communication at a UE.
FIG. 11 is a flowchart of a method of wireless communication at a network entity.
FIG. 12 is a diagram illustrating a hardware implementation for an example UE apparatus.
FIG. 13 is a diagram illustrating a hardware implementation for one or more example network entities.

DETAILED DESCRIPTION

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. 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) . For example, 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) .
Operations of the base station 104 and/or network designs may be based on aggregation characteristics of base station functionality. For example, 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. For example, the base stations 104d/104e and/or the RUs 106a-106d may communicate with the UEs 102a-102d and 102s via one or more radio frequency (RF) access links based on a Uu interface. In examples, 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. For example, 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 108d and the CU 110d. In further examples, 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. For example, 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. 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. For example, 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. For instance, 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.
Any combination of the RU 106, the DU 108, and the CU 110, or reference thereto individually, may correspond to a base station 104. Thus, 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. For example, the cell 190e may correspond to a macrocell, whereas 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. ”
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. For example, 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. The carriers may or may not be adjacent to each other along a frequency spectrum. In examples, 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, such as the UEs 102a and 102s, may perform device-to-device (D2D) communications over sidelink. For example, a sidelink communication/D2D link utilizes a spectrum for a wireless wide area network (WWAN) associated with uplink and downlink communications. 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.
The electromagnetic spectrum is often subdivided into different classes, bands, channels, etc., based on different frequencies/wavelengths associated with the electromagnetic spectrum. Fifth-generation (5G) NR is generally associated with two operating frequency ranges (FRs) referred to as frequency range 1 (FR1) and frequency range 2 (FR2) . FR1 ranges from 410 MHz -7.125 GHz and FR2 ranges from 24.25 GHz -71.0 GHz, which includes FR2-1 (24.25 GHz -52.6 GHz) and FR2-2 (52.6 GHz -71.0 GHz) . Although a portion of FR1 is actually greater than 6 GHz, FR1 is often referred to as the “sub-6 GHz” band. In contrast, FR2 is often referred to as the “millimeter wave” (mmW) band. FR2 is different from, but a near subset of, the “extremely high frequency” (EHF) band, which ranges from 30 GHz -300 GHz and is sometimes also referred to as a “millimeter wave” band. Frequencies between FR1 and FR2 are often referred to as “mid-band” frequencies. The operating band for the mid-band frequencies may be referred to as frequency range 3 (FR3) , which ranges 7.125 GHz -24.25 GHz. Frequency bands within FR3 may include characteristics of FR1 and/or FR2. Hence, features of FR1 and/or FR2 may be extended into the mid-band frequencies. Higher operating frequency bands have been identified to extend 5G NR communications above 52.6 GHz associated with the upper limit of FR2. Three of these higher operating frequency bands include FR2-2, which ranges from 52.6 GHz -71.0 GHz, FR4, which ranges from 71.0 GHz -114.25 GHz, and FR5, which ranges from 114.25 GHz -300 GHz. The upper limit of FR5 corresponds to the upper limit of the EHF band. Thus, unless otherwise specifically stated herein, the term “sub-6 GHz” may refer to frequencies that are less than 6 GHz, within FR1, or may include the mid-band frequencies. Further, unless otherwise specifically stated herein, the term “millimeter wave” , or mmW, refers to frequencies that may include the mid-band frequencies, may be within FR2-1, FR4, FR2-2, and/or FR5, or may be within the EHF band.
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. For example, 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. In a further example, 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. In further examples, beamformed signals may be communicated between a first base station/RU 106a and a second base station 104e. For instance, 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. In further examples, 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. 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) . In some examples, the UE 102a operates in dual connectivity (DC) with the base station 104e and the base station/RU 106a. In such cases, the base station 104e can be a master node and the base station/RU 160a can be a secondary node.
Uplink/downlink signaling may also be communicated via a satellite positioning system (SPS) 114. In an example, the SPS 114 of the cell 190c may be in communication with one or more UEs 102, such as the UE 102c, and one or more base stations 104/RUs 106, such as the RU 106c. The SPS 114 may correspond to one or more of a Global Navigation Satellite System (GNSS) , a global position system (GPS) , a non-terrestrial network (NTN) , or other satellite position/location system. The SPS 114 may be associated with LTE signals, NR signals (e.g., based on round trip time (RTT) and/or multi-RTT) , wireless local area network (WLAN) signals, a terrestrial beacon system (TBS) , sensor-based information, NR enhanced cell ID (NR E-CID) techniques, downlink angle-of-departure (DL-AoD) , downlink time difference of arrival (DL-TDOA) , uplink time difference of arrival (UL-TDOA) , uplink angle-of-arrival (UL-AoA) , and/or other systems, signals, or sensors.
Still referring to FIG. 1, in certain aspects, any of the UEs 102 may include a report component 140 configured to receive, from the network entity 104, a rank-specific CSI report configuration indicating rank-specific parameters for a CSI report; transmit, to the network entity 104, the CSI report including CSI measurement information for a CSI-RS, the CSI measurement information being associated with the rank-specific parameters.
In certain aspects, any of the base stations 104 or a network entity of the base stations 104 may include a rank-specific configuration component 150 configured to transmit, to a UE 102, a rank-specific CSI report configuration indicating rank-specific parameters for a CSI report; receive, from the UE 102, the CSI report including CSI measurement information for a CSI-RS, the CSI measurement information being associated with the rank-specific parameters.
Accordingly, FIG. 1 describes a wireless communication system that may be implemented in connection with aspects of one or more other figures described herein. Further, although the following description may be focused on 5G NR, the concepts described herein may be applicable to other similar areas, such as 5G-Advanced and future versions, LTE, LTE-advanced (LTE-A) , and other wireless technologies, such as 6G.
FIG. 2A illustrates a diagram 200 of a downlink transmission using different transmission power for a serving UE 102a at the center of a cell 206. The diagram 200 includes a network entity 104 and a serving UE 102a and a victim UE 102b. The network entity 104 can schedule a downlink (DL) transmission to the serving UE 102a with a network beams 204a.
The serving UE 102a may be located at the center of a cell 206. In this situation, a coupling loss between the serving UE 102a and the network entity 104 may be small. As a result, the serving UE 102a may transmit report including a rank indicator RI that indicates a high rank transmission. Because the RI indicates the high rank transmission, the network entity 104 transmits the PDSCH transmission from a reduced number of antenna ports. However, currently the network entity can only configure a single codebook configuration for a CSI report configuration. Therefore, the serving UE 102 can only report a CSI based on a single codebook configuration of antenna ports (N1, N2) . The network entity 104 may not be able to accurately determine the number antenna ports for the PDSCH transmission.
Still referring to FIG. 2A, if the network entity 104 uses more antenna ports for the downlink transmission, the network entity 104 may consume unnecessary power, which could potentially increase an interference to other UEs (e.g., the victim UE 102b) in a neighboring cell. Referring to the spectrum efficiency versus number of antenna ports 208a, the spectrum efficiency (SE) for the serving UE 102a does not substantially change as the number of antenna ports increase (e.g., from 16 to 32 ports) . However, referring to the spectrum efficiency versus number of antenna ports 208b, the spectrum efficiency (SE) for the victim UE 102b may significantly decrease as the number of antenna ports increase (e.g., from 16 to 32 ports) .
FIG. 2B illustrates a diagram 240 of a downlink transmission using different transmission power for a serving UE 102 at an edge of a cell 206. The diagram 204 includes a network entity 104 and a serving UE 102a and a victim UE 102b. The network entity 104 can schedule a downlink (DL) transmission to the serving UE 102a with a network beams 204b.
The serving UE 102a may be located at the edge of a cell 206. In this situation, the serving UE 102a may not have enough cell coverage. As a result, the serving UE 102a may transmit a report including a rank indicator (RI) that indicates a low rank transmission. Because the RI indicates the low rank transmission, the network entity 104 uses a larger number of antenna ports (e.g., 32 ports) which may increase the SE for the serving UE 102a.
Still referring to FIG. 2B, if the network entity 104 uses more antenna ports (e.g., 32 ports) for the downlink transmission, the network entity 104 may potentially increase interference to other UEs (e.g., the victim UE 102b) in a neighboring cell. Referring to the spectrum efficiency versus number of antenna ports 208c, the spectrum efficiency (SE) for the serving UE 102a increases as the number of antenna ports increase (e.g., from 16 to 32 ports) . In this scenario, if the network entity 104 uses a reduced number of antenna ports (e.g., 16 ports) , the serving UE 102 may experience spectrum efficiency (SE) degradation. Referring to the spectrum efficiency versus number of antenna ports 208d, the spectrum efficiency (SE) for the victim UE 102b decreases as the number of antenna ports increase (e.g., from 16 to 32 ports) .
The network entity 104 may allocate different transmission power for the serving UE 102a with a high rank or a low rank transmission. For example, for the serving UE 102a with the low rank transmission, the network entity 104 may allocate a higher transmission power. However, the network entity 104 may allocate a lower transmission power for the serving UE 102a with the high rank transmission to save network power and reduce interference to the victim UE 102b.
Although FIGs. 2A-2B show two UEs (e.g., 102a and 102b) , it is understood that more than two UEs may be served by the network entity 104 based on various aspects describe in detail below. Thus, FIG. 3 illustrates a signaling diagram of an example scenario in which user equipment (UE) and network entity exchanges messages and implement procedures for performing rank-specific configuration and report procedure to address these technical concerns.
FIG. 3 illustrates a signaling diagram 300 of an example scenario in which UE 102 and network entity 104 exchanges messages and implement procedures for performing rank-specific configuration and report procedure, according to some embodiments. 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.
In some examples, initially, the UE 102 may transmit 302, to the network entity 104, (the network entity 104 may receive 302) a UE capability report indicating a capability of the UE for transmitting a report in association with a set of codebook configurations and the set of rank restrictions. The UE capability report may also indicate one or more than one of the parameters: a first maximum number of configured codebooks for a CSI report configuration, a second maximum number of CSIs for a CSI report configuration, a third maximum number of configured linked CSI report configurations for the report, and a fourth maximum number of reported CSIs for the linked CSI report configurations.
Based on the UE capability, the network entity 104 transmits 304 (the UE 102 receives 304) a rank-specific CSI report configuration via a control signaling, e.g., RRC signaling (RRCReconfiguration) , configuring one CSI report configuration with multiple codebook configurations and/or power offsets between CSI-RS and PDSCH corresponding to different rank restrictions. In some implementations, the RRC signaling configures multiple linked CSI report configurations with different codebook configurations and/or power offsets between CSI-RS and PDSCH, and rank restrictions.
In some implementations, the network entity 104 configures one CSI report configuration, where the network entity 104 configures a set of codebook configurations and a set of rank restrictions, and each rank restriction is mapped to each codebook configuration, respectively. In some other implementations, the network entity 104 configures multiple CSI report configurations, where each CSI report configuration provides one codebook configuration and one rank restriction. The network entity 104 configures the CSI report configurations that are linked CSI report configurations. The network entity 104 configures orthogonal rank restrictions for the linked CSI report configurations. Thus, the candidate rank is different in different CSI report configuration.
The network entity 104 transmits 306 (the UE 102 receives 306) a medium access control-control element (MAC CE) or a downlink control information (DCI) triggering the CSI report for the configured CSI report configurations and/or the CSI-RS for CSI acquisition.
For a certain type of CSI report, e.g., semi-persistent or aperiodic CSI report, and/or a certain type of CSI-RS, e.g., semi-persistent or aperiodic CSI-RS, the network entity may transmit a second control signaling, e.g., a medium access control-control element (MAC-CE) or a downlink control information (DCI) , triggering the configured CSI report and/or the configured CSI-RS resource (s) .
The network entity 104 transmits 308 (the UE 102 receives 308) the CSI-RS for CSI acquisition.
The network entity 104 receives 310 (the UE 102 transmits 310) the CSI report based on the one or more than one CSI report configurations.
In this disclosure, unless otherwise specified, a RRC signaling may indicate an RRC reconfiguration message from the network entity 104 to the 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 network entity. In addition, the network entity 104 may obtain the UE capability via UE capability report signaling or from another network entity 104 or a core network (e.g., Access and Mobility Management Function (AMF) ) .
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 rank-specific configuration and report procedure, and FIG. 4 describes a method from a UE-side of the wireless communication link.
Now turning to FIG. 4 which illustrates an example method 400 for performing rank-specific configuration and report procedure implemented in the UE. The method 400 can be implemented by UE 102 depicted in FIGs. 1-2B. With reference to FIGs. 1-3, the method 400 may be performed by the UE 102, the UE apparatus 1200, etc., which may include the memory 1224’ and which may correspond to the entire UE 102 or the UE apparatus 1200, or a component of the UE 102 or the UE apparatus 1200, such as the wireless baseband processor 1224, and/or the application processor 1206.
The UE 102 transmits 402, to the network entity 104, a UE capability indicating supported rank-specific codebook configurations. For example, referring to FIG. 3, the UE 102 may transmit 302, to the network entity 104 a UE capability report indicating a capability of the UE for transmitting a report in association with a set of codebook configurations and the set of rank restrictions.
The UE 102 receives 404, from the network entity 104, an RRC signaling configuring one CSI report configuration with multiple codebook configurations and/or power offsets between CSI-RS and PDSCH corresponding to different rank restrictions. In some implementations, the RRC signaling configures multiple linked CSI report configurations with different codebook configurations and/or power offsets between CSI-RS and PDSCH, and rank restrictions. For example, referring to FIG. 3, the UE 102 may receive 304, from the network entity 104 a specific CSI report configuration via a control signaling, e.g., RRC signaling (RRCReconfiguration) , configuring one CSI report configuration with multiple codebook configurations and/or power offsets between CSI-RS and PDSCH corresponding to different rank restrictions. In some implementations, the RRC signaling configures multiple linked CSI report configurations with different codebook configurations and/or power offsets between CSI-RS and PDSCH, and rank restrictions.
The UE 102 may receive 406, from the network entity 104, a MAC CE or a DCI triggering the CSI report for the configured one or more than one CSI report configurations and/or the CSI-RS for CSI acquisition. Referring to FIG. 3, for example, the UE 102 receives 306 a medium access control-control element (MAC CE) or a downlink control information (DCI) triggering the CSI report for the configured CSI report configurations and/or the CSI-RS for CSI acquisition.
The UE 102 receives 408, from the network entity 104, the CSI-RS for CSI acquisition. Referring to FIG. 3, for example, the UE 102 receives 308 the CSI-RS for CSI acquisition.
The UE 102 determines 410 the CSI based on the received CSI report configuration and transmit, to the network entity 104, the determined CSI. Referring to FIG. 3, for example, the UE 102 transmits 310 the CSI report based on the CSI report configuration.
FIG. 4 describes a method from a UE-side of a wireless communication link, whereas FIG. 5 describes a method from a network-side of the wireless communication link.
FIG. 5 is a flowchart 500 of a method of wireless communication at a network entity. With reference to FIGs. 1-3, 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, the CU 110, an RU processor 1306, a DU processor 1326, a CU processor 1346, etc. The one or more network entities 104 may include memory 1306’/1326’/1346’, which may correspond to an entirety of the one or more network entities 104, or a component of the one or more network entities 104, such as the RU processor 1306, the DU processor 1326, or the CU processor 1346.
The network entity 104 receives 502, from the UE 102, a UE capability report indicating supported rank-specific codebook configurations. For example, referring to FIG. 3, network entity 104 receives 302, from the UE 102, a UE capability report indicating a capability of the UE for transmitting a report in association with a set of codebook configurations and the set of rank restrictions.
The network entity 104, transmits 504, to the UE 102, an RRC signaling configuring one CSI report configuration with multiple codebook configurations and/or power offsets between CSI-RS and PDSCH corresponding to different rank restrictions. In some implementations, the RRC signaling configures multiple linked CSI report configurations with different codebook configurations and/or power offsets between CSI-RS and PDSCH, and rank restrictions. For example, referring to FIG. 3, the network entity transmits 304, to the UE 102, a rank-specific CSI report configuration via a control signaling, e.g., RRC signaling (RRCReconfiguration) , configuring one CSI report configuration with multiple codebook configurations and/or power offsets between CSI-RS and PDSCH corresponding to different rank restrictions. In some implementations, the RRC signaling configures multiple linked CSI report configurations with different codebook configurations and/or power offsets between CSI-RS and PDSCH, and rank restrictions.
The network entity 104 transmits 506, to the UE 102, a MAC CE or DCI triggering the CSI report for the configured one or more than one CSI report configurations and/or the CSI-RS for CSI acquisition. For example, referring to FIG. 3, the network entity 104 transmits 306, to the UE 102, a medium access control-control element (MAC CE) or a downlink control information (DCI) triggering the CSI report for the configured CSI report configurations and/or the CSI-RS for CSI acquisition.
The network entity 104 transmits 508, to the UE 102, the CSI-RS for CSI acquisition. For example, referring to FIG. 3, the network entity 104 transmits 308, to the UE 102, the CSI-RS for CSI acquisition.
The network entity 104 receives 510 the CSI report corresponding to the one or more than one CSI report configuration. For example, referring to FIG. 3, the network entity 104 receives 310, from the UE 102, the CSI report based on the one or more than one CSI report configurations.
FIG. 5 describes a method from a network-side of the wireless communication link, whereas FIG. 6A illustrates an example for the configuration of rank-specific codebooks based on one codebook configuration.
FIG. 6A is an example 600 for the configuration of rank-specific codebooks based on one codebook configuration. In some implementations, the network entity 104 configures the set of codebooks using one codebook configuration 601, e.g., codebookConfig.
Referring to FIG. 6A, in an embodiment, for a CSI report, the network entity 104 configures a single CSI report configuration 602 configuring at least one of the parameters: a set of codebooks 604, a set of rank restrictions 606, and a set of power offsets between the CSI-RS and PDSCH 608. Each rank restriction (e.g., Rank restriction 1 606a) is one-to-one mapped to the codebook configuration (e.g., Codebook with port configuration 1 604a) and the power offset between the CSI-RS and PDSCH (e.g., Power offset 1 608a) . The network entity 104 may configure orthogonal rank restrictions. Thus, the candidate rank corresponding to each rank restriction shall be different.
In one example, the network entity 104 configures a first codebook configuration 604a for a first rank restriction 606a corresponding to the low ranks (e.g., rank = 1 and 2) . The first rank restriction 606a is one-to-one mapped to the Power offset 1 608a. The network entity 104 configures a second codebook configuration 604b for a second rank restriction 606b corresponding to the high ranks (e.g., rank = 3 and 4) . The second rank restriction 606b is one-to-one mapped to the Power offset 2 608b.
In some other implementations, the network entity 104 configures a common rank restriction for the CSI report configuration, and each codebook and/or power offset between CSI-RS and PDSCH is mapped to each candidate rank. In one example, the network entity 104 configures the rank restriction indicating the candidate rank as {1, 2, 4} . Then, the network entity 104 configures three codebooks and/or three power offsets, and each codebook and/or power offsets corresponds to the rank {1, 2, 4} , respectively.
In some implementations, the network entity 104 configures different number of ports for the codebooks. In some other implementations, the network entity 104 configures a common value for at least one of the parameters other than the number of ports in the codebook configuration for the set of codebooks. Thus, for at least one of the parameters other than the number of ports in the codebook configuration, the network entity 104 refrains from configuring different value. In one example, the network entity 104 configures the same type of codebook e.g., Type1, Type2, eType2 and so on, and codebook mode, e.g., codebookMode, in the set of codebooks. In another example, the network entity 104 configures the same value for the number of PMI per CQI (e.g., numberOfPMI-SubbandsPerCQI-Subband) , number of beams (e.g., numberOfBeams) , parameter combinations (e.g., paramCombination) , for the codebooks if the codebook is configured as a Type2 codebook. In some other implementations, the UE 102 may report the UE capability indicating whether the UE 102 supports different value for at least one of the parameters other than the number of ports in the codebook configuration for the set of codebooks.
In some implementations, the UE 102 measures the CSI based on the codebook for each rank in the triggered CSI report configuration, and the UE 102 reports only one CSI to the network entity using Physical Uplink Control Channel (PUCCH) or Physical Uplink Shared Channel (PUSCH) . The UE 102 may report a codebook indicator (CI) in addition to other CSI elements indicating the codebook corresponding to the CSI. When reporting the CSI by long PUCCH (e.g., PUCCH with more than 4 symbols) or PUSCH, the UE 102 may report the CI in CSI part 1 or CSI part 2. Alternatively, the network entity 104 configures the orthogonal rank restrictions. Then the UE 102 can indicate the codebook for the CSI by reporting the RI, where the RI is based on all the rank restrictions in the CSI report configuration. In one example, the network entity 104 configures two rank restrictions indicating candidate rank as {1, 3} and {4, 7} . Then the RI = {0, 1, 2, 3} indicate rank {1, 3, 4, 7} , respectively.
In some other implementations, the network entity 104 may configure the number of reported CSIs by RRC signaling, MAC CE or DCI. In some other implementations, the UE 102 reports one CSI per codebook. In some other implementations, the UE 102 reports the UE capability indicating the maximum number of reported CSIs for the CSI report configuration with more than one codebooks. The UE 102 may multiplex the CSIs based on the order of the codebooks. In one example, the UE 102 multiplexes the CSI for first codebook, then CSI for the second codebook and so on.
FIG. 6B is an example 650 for the configuration of rank-specific codebooks based on a set of codebook configurations. As illustrated in FIG. 6B, the network entity 104 configures a set of codebooks by a set of codebook configurations, e.g., codebookConfigList. Each codebook configuration with a port configuration and a rank restriction (e.g., Codebook configuration with port configuration 1 and rank restriction 1 654a) is one-to-one mapped to a corresponding power offset between the CSI-RS and PDSCH (e.g., Power offset 1 658a) . For example, as shown in FIG. 6B, codebook configuration with a port configuration 1 and a rank restriction 1 654a is one-to-one mapped to power offset 1 658a, code configuration with port configuration 2 and rank restriction 2 is one-to-one mapped to power offset 2, and so on.
FIG. 6C illustrates one example 680 for the CSI report based on the CSI report configuration with more than one codebooks. For example, as shown in FIG. 6C, the CSI report configuration 682 includes codebook configuration with a port configuration 1 and a rank restriction 1 684a, codebook configuration with a port configuration 2 and a rank restriction 2 684b, ..., and codebook configuration with a port configuration N and a rank restriction N 684c. The reported CSIs (e.g., 686a and 686b) includes a CI indicating the codebook used for the CSI measurement. For example, the UE 102 may transmit a CSI report 686a including CI = 0 , and other CSIs (e.g., RI/PMI/CQI) corresponding to codebook configuration 1. The UE 102 may also transmit a CSI report 686b including CI = 2, and other CSIs (e.g., RI/PMI/CQI) corresponding to codebook configuration 3.
In an embodiment, the network entity 104 configures a CSI-RS for the CSI report configuration with more than one codebook or power offset. The number of ports for the CSI-RS is based on the maximum number of horizontal ports and vertical ports in the configured codebooks. In one example, the number of ports for the CSI-RS is where theand are the configured number of horizontal ports and vertical ports for the codebook with the greatest number of ports.
For the CSI measurement from the other codebooks with a reduce number of ports, the antenna to port mapping is determined based on the configured N1 and N2 in the codebook and the configured number of horizontal ports and vertical ports for the codebook with the greatest number of ports.
FIG. 7 illustrates an example 700 for the port selection for the CSI measurement for the codebook with a reduced number of ports. The network entity 104 determines a number of horizontal ports and vertical ports based on the (N1, N2) configured in the codebook with the greatest number of ports (e.g., N1 = 4, N2 = 4) . For example, the number of horizontal ports and vertical ports 702 is 16.
As illustrated in FIG. 7, the network entity 104 configures a reduced number of ports antenna ports from the CSI-RS used for CSI measurement for the codebook. For example, the network entity 104 determines the number of horizontal ports and vertical ports for the CSI measurement based on the (N1, N2) configured in the codebook with a reduced number of ports (e.g., N1 = 4, N2 = 2) . In this example, the number of horizontal ports and vertical ports 704 for CSI measurement is 8, which is smaller than the number of horizontal ports and vertical ports 702.
FIG. 8 illustrates one example 800 for the CSI report based on a set of CSI-RSs, a set of codebooks, and a set of rank restrictions. Referring to FIG. 8, for example, a CSI report configuration 802 configures rank-specific parameters including a set of CSI-RSs 808, a set of codebooks 804 and a set of rank restrictions 806. In an embodiment, the network entity 104 configures a set of CSI-RS for the CSI report configuration with more than one codebooks or power offsets. Each CSI-RS corresponds to a codebook or power offset or rank restriction. For example, CSI-RS 1 with power offset 1 808a is one-to-one mapped to rank restriction 1 806a and codebook 1 804a.
In some implementations, the network entity 104 configures the same value for at least one of the parameters for the set of CSI-RSs, including transmission configuration indicator (TCI) or quasi-co-location (QCL) , resource blocks, subcarriers, time domain behavior (aperiodic, semi-persistent, periodic) , periodicity and slot offset. Thus, the network entity 104 may refrain from configuring different values for the at least one of the parameters described above for the set of CSI-RSs. In some other implementations, the UE 102 may report the UE capability indicating whether it supports different values for the at least one of the parameters described above for the set of CSI-RSs.
In some other implementations, the network entity 104 may configure the same number of ports or number of horizontal and vertical port for each CSI-RS resource. The network entity 104 may configure the same number of ports or the same number of horizontal and vertical port for the CSI-RS resources. Alternatively, the network entity 104 may configure the antenna indexing (horizontal and vertical port index) for each port for the CSI-RS resource. The network entity 104 may configure an association between the CSI-RS resources and each codebook. Then, the UE 102 may measure the CSI from more than one CSI-RS resources.
In an embodiment, the network entity 104 configures a set of CSI-RS report configurations for the rank-specific codebook based CSI report. The network entity 104 may configure the linkage for the CSI-RS report configurations by RRC signaling, MAC CE, or DCI.
In one example, for periodic CSI report, the network entity 104 configures the linked CSI report configurations for the CSI report by RRC signaling. For semi-persistent CSI report, the network entity 104 indicates the linked CSI report configuration index for the activated CSI report. For aperiodic CSI report, the network entity 104 can trigger a CSI report corresponding to one or more than one CSI report configurations, where the triggered CSI report configurations are the linked CSI report configurations.
In some implementations, the network entity 104 may configure different codebooks and/or power offsets between CSI-RS and PDSCH and rank restrictions for the linked CSI report configurations. The network entity 104 may provide the same configuration for at least one of the parameters other than the codebook, power offset and rank restriction in the CSI report configuration. Thus, the network entity 104 may refrain from configuring different values for at least one of parameters other than the codebook, power offset, and rank restriction in the CSI report configurations. In some other implementations, the UE 102 may report the UE capability indicating whether it supports different values for at least one of parameters other than the codebook, power offset, and rank restriction in the CSI report configurations.
Figure 9 illustrates one example 900 for the CSI report based on multiple CSI report configurations. In some implementations, the UE 102 reports only one CSI based on the configured linked CSI report configurations. In some implementations, in addition to other CSI elements (e.g., RI/PMI/CQI) , the UE 102 may report a CSI report configuration indicator (CRCI) (e.g., 906a) , indicating the corresponding CSI report configuration (902a) for the reported CSI. When reporting the CSI by long PUCCH (e.g., PUCCH with more than 4 symbols) or PUSCH, the UE 102 may report the CRCI in CSI part 1 or CSI part 2. In some other implementations, the network entity 104 configures orthogonal rank restrictions for the linked CSI report configurations. Thus, the network entity 104 refrains from configuring non-orthogonal rank restrictions for the linked CSI report configurations. Then, the UE 102 can report the RI to indicate the corresponding CSI report configuration for the reported CSI. Then, the RI is based on all the rank restrictions configured in the linked CSI report configurations. In one example, the network entity 104 configures two rank restrictions indicating candidate rank in two CSI report configurations as {1, 3} and {4, 7} . Then, the RI = {0, 1, 2, 3} indicate rank {1, 3, 4, 7} , respectively.
In some other implementations, the network entity 104 may configure the number of reported CSIs based on the linked CSI report configurations by RRC signaling, MAC CE, or DCI. The UE 102 may report the UE capability indicating the maximum number of reported CSIs based on the linked CSI report configurations. In some other implementations, the UE 102 reports one CSI per CSI report configurations. The UE 102 may multiplex the CSIs based on the order of the CSI report configuration identifier.
In an embodiment, the network entity 104 configures a common CSI-RS resource in the linked CSI report configurations. The number of ports for the CSI-RS is based on the maximum number of horizontal ports and vertical ports in the configured codebook in the linked CSI report configurations. In one example, the number of ports for the CSI-RS is where the and are the configured number of horizontal ports and vertical ports for the codebook with the greatest number of ports.
For the CSI measurement from the other codebooks with a reduced number of ports, the antenna to port mapping is determined based on the configured N1 and N2 in the codebook for the CSI report configuration and the configured number of horizontal ports and vertical ports for the codebook with the greatest number of ports in the linked CSI report configurations.
In an embodiment, the network entity 104 configures one or a list of CSI-RS for a linked CSI report configuration. The CSI-RS (s) in the CSI report configuration corresponds to the codebook, power offset, and rank restriction configured in the CSI report configuration.
In some implementations, the network entity 104 configures the same value for at least one of the parameters for the CSI-RSs in the linked CSI report configurations, including TCI or QCL, resource blocks, subcarriers, time domain behavior (aperiodic, semi-persistent, periodic) , periodicity, and slot offset. Thus, the network entity 104 may refrain from configuring different values for the at least one of the parameters above for the set of CSI-RSs. In some other implementations, the UE 102 may report the UE capability indicating whether it supports different values for the at least one of the parameters above for the CSI-RSs in the linked CSI report configurations.
FIG. 10 illustrates a flowchart 1000 of a method of wireless communication at a UE. With reference to FIGs. 1-4 and 12, the method may be performed by the UE 102, the UE apparatus 1202, etc., which may include the memory 1226′, 1206′, 1216, and which may correspond to the entire UE 102 or the entire UE apparatus 1202, or a component of the UE 102 or the UE apparatus 1202, such as the wireless baseband processor 1226 and/or the application processor 1206.
The UE 102 may transmit 1002, to the network entity 104, a UE capability report. For example, referring to FIG. 4, the UE 102 may transmit 402, to the network entity 104, a UE capability indicating supported rank-specific codebook configurations.
The UE 102 receives 1004, from the network entity 104, a rank-specific CSI report configuration indicating rank-specific parameters for a CSI report. For example, referring to FIG. 4, the network entity 104 transmits 404 a rank-specific CSI report configuration via a control signaling, e.g., RRC signaling (RRCReconfiguration) , configuring one CSI report configuration with multiple codebook configurations and/or power offsets between CSI-RS and PDSCH corresponding to different rank restrictions. In some implementations, the RRC signaling configures multiple linked CSI report configurations with different codebook configurations and/or power offsets between CSI-RS and PDSCH, and rank restrictions. See also the examples of CSI report configurations in FIGs. 6A, 6B, 6C, 7, 8, and 9.
The UE 102 receives 1004A, from the network entity 104, a CSI report configuration indicating the rank-specific CSI report configuration. For example, referring to FIG. 4, the network entity 104 transmits 404 a rank-specific CSI report configuration via a control signaling, e.g., RRC signaling (RRCReconfiguration) , configuring one CSI report configuration with multiple codebook configurations and/or power offsets between CSI-RS and PDSCH corresponding to different rank restrictions. In some implementations, the RRC signaling configures multiple linked CSI report configurations with different codebook configurations and/or power offsets between CSI-RS and PDSCH, and rank restrictions.
The UE 102 receives 1004B, from the network entity 104, an indication of an association between multiple rank-specific CSI report configurations that include the rank-specific CSI report configuration. For example, referring to FIG. 4, the network entity 104 transmits 404 a rank-specific CSI report configuration via a control signaling, e.g., RRC signaling (RRCReconfiguration) , configuring one CSI report configuration with multiple codebook configurations and/or power offsets between CSI-RS and PDSCH corresponding to different rank restrictions. In some implementations, the RRC signaling configures multiple linked CSI report configurations with different codebook configurations and/or power offsets between CSI-RS and PDSCH, and rank restrictions.
The UE 102 may receive 1006, from the network entity 104, a triggering indication for the CSI report based on the rank-specific CSI report configuration. For example, referring to FIG. 4, the UE 102, receives 406, from the network entity 104, a second control signaling triggering the at least one report configuration and/or the at least one SSB/CSI-RS resource. For example, referring to FIG. 4, the network entity 104 transmits 406, to the UE 102, a medium access control-control element (MAC CE) or a downlink control information (DCI) triggering the CSI report for the configured CSI report configurations and/or the CSI-RS for CSI acquisition.
The UE 102 receives 1008A, from the network entity 104, a single CSI-RS for the CSI measurement information, the single CSI-RS being associated with the rank-specific CSI report configuration. For example, referring to FIG. 4, the UE 102 receives 408 the CSI-RS for CSI acquisition.
The UE 102 receives 1008B, from the network entity 104, a plurality of CSI-RSs for the CSI measurement information, the CSI-RS being one of the plurality of CSI-RSs. For example, referring to FIG. 4, the UE 102 receives 408 the CSI-RS for CSI acquisition.
The UE 102 transmits 1010, to the network entity 104, the CSI report including CSI measurement information for a CSI-RS, the CSI measurement information being associated with the rank-specific parameters. For example, referring to FIG. 4, the network entity 104 receives 410 the CSI report based on the one or more than one CSI report configurations.
FIG. 10 describes a method from a UE-side of a wireless communication link, whereas FIG. 11 describes a method from a network-side of the wireless communication link.
FIG. 11 is a flowchart 1100 of a method of wireless communication at a network entity. With reference to FIGs. 1-3, 5, and 13, 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, the CU 110, an RU processor 1306, a DU processor 1326, a CU processor 1346, etc. The one or more network entities 104 may include memory 1306’/1326’/1346’, which may correspond to an entirety of the one or more network entities 104, or a component of the one or more network entities 104, such as the RU processor 1306, the DU processor 1326, or the CU processor 1346.
The network entity 104 may receive 1102, from the UE 102, a UE capability report. For example, referring to FIG. 5, network entity 104 receives 502, from the UE 102, a UE capability indicating supported rank-specific codebook configurations.
The network entity 104 transmits 1104 to the UE 102, a rank-specific CSI report configuration indicating rank-specific parameters for a CSI report. For example, referring to FIG. 5, the network entity 104 transmits 504, to the UE 102, RRC signaling configuring one CSI report configuration with multiple codebook configurations and/or power offsets between CSI-RS and PDSCH corresponding to different rank restrictions. In some implementations, the RRC signaling configures multiple linked CSI report configurations with different codebook configurations and/or power offsets between CSI-RS and PDSCH, and rank restrictions. See also the examples of CSI report configurations in FIGs. 6A, 6B, 6C, 7, 8, and 9.
The network entity 104 transmits 1104A, to the UE 102, a CSI report configuration indicating the rank-specific CSI report configuration. For example, referring to FIG. 5, the network entity 104 transmits 504 a rank-specific CSI report configuration via a control signaling, e.g., RRC signaling (RRCReconfiguration) , configuring one CSI report configuration with multiple codebook configurations and/or power offsets between CSI-RS and PDSCH corresponding to different rank restrictions. In some implementations, the RRC signaling configures multiple linked CSI report configurations with different codebook configurations and/or power offsets between CSI-RS and PDSCH, and rank restrictions.
The network entity 104 transmits 1104B, to the UE 102, an indication of an association between multiple rank-specific CSI report configurations that include the rank-specific CSI report configuration. For example, referring to FIG. 5, the network entity 104 transmits 504 a rank-specific CSI report configuration via a control signaling, e.g., RRC signaling (RRCReconfiguration) , configuring one CSI report configuration with multiple codebook configurations and/or power offsets between CSI-RS and PDSCH corresponding to different rank restrictions. In some implementations, the RRC signaling configures multiple linked CSI report configurations with different codebook configurations and/or power offsets between CSI-RS and PDSCH, and rank restrictions.
The network entity 104 transmits 1106, to the UE 102, a triggering indication for the CSI report based on the rank-specific CSI report configuration. For example, referring to FIG. 5, the network entity 104 transmits 506, to the UE 102, a medium access control-control element (MAC CE) or a downlink control information (DCI) triggering the CSI report for the configured CSI report configurations and/or the CSI-RS for CSI acquisition.
The network entity 104 transmits 1108A, to the UE 102, a single CSI-RS for the CSI measurement information, the single CSI-RS being associated with the rank-specific CSI report configuration. Referring to FIG. 5, for example, the UE 102 receives 508 the CSI-RS for CSI acquisition.
The network entity 104 transmits 1108B, to the UE 102, a plurality of CSI-RSs for the CSI measurement information, the CSI-RS being one of the plurality of CSI-RSs. Referring to FIG. 5, for example, the UE 102 receives 508 the CSI-RS for CSI acquisition.
The network entity 104 transmits 1110, to the UE, the CSI report including CSI measurement information for a CSI-RS, the CSI measurement information being associated with the rank-specific parameters. Referring to FIG. 5, for example, the network entity 104 receives 510, from the UE 102, the CSI report based on the one or more than one CSI report configurations.
A UE apparatus 1202, as described in FIG. 12, may perform the signaling diagram of 300 and method of flowchart 400, 1000. The one or more network entities 104, as described in FIG. 13, may perform the signaling diagram of 300 and the method of flowchart 500, 1100.
FIG. 12 is a diagram 1200 illustrating an example of a hardware implementation for a UE apparatus 1202. The UE apparatus 1202 may be the UE 102, a component of the UE 102, or may implement UE functionality. The UE apparatus 1202 may include an application processor 1206, which may have on-chip memory 1206’ . In examples, the application processor 1206 may be coupled to a secure digital (SD) card 1208 and/or a display 1210. The application processor 1206 may also be coupled to a sensor (s) module 1212, a power supply 1214, an additional module of memory 1216, a camera 1218, and/or other related components. For example, the sensor (s) module 1212 may control a barometric pressure sensor/altimeter, a motion sensor such as an inertial management unit (IMU) , a gyroscope, accelerometer (s) , a light detection and ranging (LIDAR) device, a radio-assisted detection and ranging (RADAR) device, a sound navigation and ranging (SONAR) device, a magnetometer, an audio device, and/or other technologies used for positioning.
The UE apparatus 1202 may further include a wireless baseband processor 1226, which may be referred to as a modem. The wireless baseband processor 1226 may have on-chip memory 1226′. Along with, and similar to, the application processor 1206, the wireless baseband processor 1226 may also be coupled to the sensor (s) module 1212, the power supply 1214, the additional module of memory 1216, the camera 1218, and/or other related components. The wireless baseband processor 1226 may be additionally coupled to one or more subscriber identity module (SIM) card (s) 1220 and/or one or more transceivers 1230 (e.g., wireless RF transceivers) .
Within the one or more transceivers 1230, the UE apparatus 1202 may include a Bluetooth module 1232, a WLAN module 1234, an SPS module 1236 (e.g., GNSS module) , and/or a cellular module 1238. The Bluetooth module 1232, the WLAN module 1234, the SPS module 1236, and the cellular module 1238 may each include an on-chip transceiver (TRX) , or in some cases, just a transmitter (TX) or just a receiver (RX) . The Bluetooth module 1232, the WLAN module 1234, the SPS module 1236, and the cellular module 1238 may each include dedicated antennas and/or utilize antennas 1240 for communication with one or more other nodes. For example, the UE apparatus 1202 can communicate through the transceiver (s) 1230 via the antennas 1240 with another UE 102 (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.
The wireless baseband processor 1226 and the application processor 1206 may each include a computer-readable medium /memory 1226′, 1206′, respectively. The additional module of memory 1216 may also be considered a computer-readable medium /memory. Each computer-readable medium /memory 1226′, 1206′, 1216 may be non-transitory. The wireless baseband processor 1226 and the application processor 1206 may each be responsible for general processing, including execution of software stored on the computer-readable medium /memory 1226′, 1206′, 1216. The software, when executed by the wireless baseband processor 1226 /application processor 1206, causes the wireless baseband processor 1226 /application processor 1206 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 1226 /application processor 1206 when executing the software. The wireless baseband processor 1226 /application processor 1206 may be a component of the UE 102. The UE apparatus 1202 may be a processor chip (e.g., modem and/or application) and include just the wireless baseband processor 1226 and/or the application processor 1206. In other examples, the UE apparatus 1202 may be the entire UE 102 and include the additional modules of the apparatus 1202.
As discussed, the report component 140 is configured to receive, from the network entity 104, a rank-specific CSI report configuration indicating rank-specific parameters for a CSI report; transmit, to the network entity 104, the CSI report including CSI measurement information for a CSI-RS, the CSI measurement information being associated with the rank-specific parameters.
The report component 140 may be within the application processor 1206 (e.g., at 140a) , the wireless baseband processor 1226 (e.g., at 140b) , or both the application processor 1206 and the wireless baseband processor 1226. 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. 13 is a diagram 1300 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 1346, which may have on-chip memory 1346′. In some aspects, the CU 110 may further include an additional module of memory 1356 and/or a communications interface 1348, both of which may be coupled to the CU processor 1346. The CU 110 can communicate with the DU 108 through a midhaul link 162, such as an F1 interface between the communications interface 1348 of the CU 110 and a communications interface 1328 of the DU 108.
The DU 108 may include a DU processor 1326, which may have on-chip memory 1326′. In some aspects, the DU 108 may further include an additional module of memory 1336 and/or the communications interface 1328, both of which may be coupled to the DU processor 1326. The DU 108 can communicate with the RU 106 through a fronthaul link 160 between the communications interface 1328 of the DU 108 and a communications interface 1308 of the RU 106.
The RU 106 may include an RU processor 1306, which may have on-chip memory 1306′. In some aspects, the RU 106 may further include an additional module of memory 1316, the communications interface 1308, and one or more transceivers 1330, all of which may be coupled to the RU processor 1306. The RU 106 may further include antennas 1340, which may be coupled to the one or more transceivers 1330, such that the RU 106 can communicate through the one or more transceivers 1330 via the antennas 1340 with the UE 102.
The on-chip memory 1306′, 1326′, 1346′and the additional modules of memory 1316, 1336, 1356 may each be considered a computer-readable medium /memory. Each computer-readable medium /memory may be non-transitory. Each of the processors 1306, 1326, 1346 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) 1306, 1326, 1346 causes the processor (s) 1306, 1326, 1346 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) 1306, 1326, 1346 when executing the software. In examples, the rank-specific 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.
As discussed, the rank-specific configuration component 150 is configured to transmit, to a user equipment (UE) 102, a rank-specific CSI report configuration indicating rank-specific parameters for a CSI report; receive, from the UE 102, the CSI report including CSI measurement information for a CSI-RS, the CSI measurement information being associated with the rank-specific parameters.
The rank-specific configuration component 150 may be within one or more processors of the one or more network entities 104, such as the RU processor 1306 (e.g., at 150a) , the DU processor 1326 (e.g., at 150b) , and/or the CU processor 1346 (e.g., at 150c) . The rank-specific 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 1306, 1326, 1346 configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by the one or more processors 1306, 1326, 1346, or a combination thereof.
The specific order or hierarchy of blocks in the processes and flowcharts disclosed herein is an illustration of example approaches. Hence, the specific order or hierarchy of blocks in the processes and flowcharts may be rearranged. Some blocks may also be combined or deleted. Dashed lines may indicate optional elements of the diagrams. The accompanying method claims present elements of the various blocks in an example order, and are not limited to the specific order or hierarchy presented in the claims, processes, and flowcharts.
The detailed description set forth herein describes various configurations in connection with the drawings and does not represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough explanation of various concepts. However, these concepts may be practiced without these specific details. In some instances, well known structures and components are shown in block diagram form in order to avoid obscuring such concepts.
Aspect of wireless communication systems, such as telecommunication systems, are presented with reference to various apparatuses and methods. These apparatuses and methods are described in the following detailed description and are illustrated in the accompanying drawings by various blocks, components, circuits, processes, call flows, systems, algorithms, etc. (collectively referred to as “elements” ) . These elements may be implemented using electronic hardware, computer software, or combinations thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.
An element, or any portion of an element, or any combination of elements may be implemented as a “processing system” that includes one or more processors. Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs) , central processing units (CPUs) , application processors, digital signal processors (DSPs) , reduced instruction set computing (RISC) processors, systems-on-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. 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.
If the functionality described herein is implemented in software, the functions may be stored on, or encoded as, one or more instructions or code on a computer-readable medium, such as a non-transitory computer-readable storage medium. 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. For example, 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.
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. For example, 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.
The description herein is provided to enable a person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not limited to the aspects described herein, but are to be interpreted in view of the full scope of the present disclosure consistent with the language of the claims.
Reference to an element in the singular does not mean “one and only one” unless specifically stated, but rather “one or more. ” Terms such as “if, ” “when, ” and “while” do not imply an immediate temporal relationship or reaction. That is, these phrases, e.g., “when, ” do not imply an immediate action in response to or during the occurrence of an action, but simply imply that if a condition is met then an action will occur, but without requiring a specific or immediate time constraint for the action to occur. The terms “may” , “might” , and “can” , as used in this disclosure, often carry certain connotations. For example, “may” refers to a permissible feature that may or may not occur, “might” refers to a feature that probably occurs, and “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.
Unless specifically stated otherwise, the term “some” refers to one or more. 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.
Unless otherwise specifically indicated, 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. Reference numbers, as used in the specification and figures, are sometimes cross-referenced among drawings to denote same or similar features. A feature that is exactly the same in multiple drawings may be labeled with the same reference number in the multiple drawings. A feature that is similar among the multiple drawings, but not exactly the same, may be labeled with reference numbers that have different leading numbers, but have one or more of the same trailing numbers (e.g., 206, 306, 406, etc., may refer to similar features in the drawings) . Sometimes an “X” is used to universally denote multiple variations of a feature. For instance, “X06” can universally refer to all reference numbers that end in “06” (e.g., 206, 306, 406, etc. ) .
Structural and functional equivalents to elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are encompassed by the claims. The words “module, ” “mechanism, ” “element, ” “device, ” and the like may not be a substitute for the word “means. ” As such, no claim element is to be construed as a means plus function unless the element is expressly recited using the phrase “means for. ” As used herein, the phrase “based on” shall not be construed as a reference to a closed set of information, one or more conditions, one or more factors, or the like. In other words, the phrase “based on A” , where “A” may be information, a condition, a factor, or the like, shall be construed as “based at least on A” unless specifically recited differently.
The following examples are illustrative only and may be combined with other examples or teachings described herein, without limitation.
Example 1 is a method of wireless communication at a UE, including: receiving, from a network entity, a rank-specific CSI report configuration indicating rank-specific parameters for a CSI report; and transmitting, to the network entity, the CSI report including CSI measurement information for a CSI-RS, the CSI measurement information being associated with the rank-specific parameters.
Example 2 may be combined with Example 1 and further includes that the rank-specific CSI report configuration jointly configures a set of parameters for each of the rank-specific parameters for the CSI report.
Example 3 may be combined with Example 1 and further includes that the rank-specific CSI report configuration configures the rank-specific parameters separately for each rank-specific CSI report configuration.
Example 4 may be combined with any of Examples 1-3 and further includes that the rank-specific parameters include at least one of: a codebook configuration, a rank restriction, or a power offset between the CSI-RS and a PDSCH.
Example 5 may be combined with any of Examples 1-4 and further includes receiving, from the network entity, a single CSI-RS for the CSI measurement information, the single CSI-RS being associated with the rank-specific CSI report configuration.
Example 6 may be combined with any of Examples 1-4 and further includes receiving, from the network entity, a plurality of CSI-RSs for the CSI measurement information, the CSI-RS being one of the plurality of CSI-RSs.
Example 7 may be combined with any of Examples 1-6 and further includes transmitting, to the network entity, a UE capability report indicating a capability of the UE for CSI reporting based on the rank-specific CSI report configuration.
Example 8 may be combined with an Example 7 and further includes that the UE capability report indicates at least one of: a first capability for a first maximum number of configured codebooks, a second capability for a second maximum number of reported CSI, a third capability for a third maximum number of CSI report configurations; or a fourth capability for a fourth maximum number of the reported CSI and the CSI report configurations.
Example 9 may be combined with any of Examples 1-8 and further includes receiving, from the network entity, a triggering indication for the CSI report based on the rank-specific CSI report configuration.
Example 10 may be combined with any of Examples 1-9 and further includes that the CSI report includes a CSI report configuration indicator (CRCI) associated with the rank-specific CSI report configuration.
Example 11 may be combined with any of Examples 1-10 and further includes that the receiving the rank-specific CSI report configuration further includes receiving, from the network entity, an indication of an association between multiple rank-specific CSI report configurations that include the rank-specific CSI report configuration.
Example 12 may be combined with any of Examples 1-11 and further includes that the CSI report includes a codebook indicator (CI) indicating a codebook used for the CSI measurement information.
Example 13 is a method of wireless communication at a network entity, including: transmitting, to a user equipment (UE) , a rank-specific CSI report configuration indicating rank-specific parameters for a CSI report; and receiving, from the UE, the CSI report including CSI measurement information for a CSI-RS, the CSI measurement information being associated with the rank-specific parameters.
Example 14 may be combined with Example 13 and further includes that the rank-specific CSI report configuration jointly configures a set of parameters for each of the rank-specific parameters for the CSI report.
Example 15 may be combined with Example 13 and further includes that the rank-specific CSI report configuration configures the rank-specific parameters separately for each rank-specific CSI report configuration.
Example 16 may be combined with any of Examples 13-15 and further includes that the rank-specific parameters include at least one of: a codebook configuration, a rank restriction, or a power offset between the CSI-RS and a physical downlink shared channel (PDSCH) .
Example 17 may be combined with any of Examples 13-16 and further includes transmitting, to the UE, a single CSI-RS for the CSI measurement information, the single CSI-RS being associated with the rank-specific CSI report configuration.
Example 18 may be combined with any of Examples 13-16 and further includes transmitting, to the UE, a plurality of CSI-RSs for the CSI measurement information, the CSI-RS being one of the plurality of CSI-RSs.
Example 19 may be combined with any of Examples 13-18 and further includes receiving, from the UE, a UE capability report indicating a capability of the UE for CSI reporting based on the rank-specific CSI report configuration.
Example 20 may be combined with Example 19 and further includes that the UE capability report indicates at least one of: a first capability for a first maximum number of configured codebooks, a second capability for a second maximum number of reported CSI, a third capability for a third maximum number of CSI report configurations; or a fourth capability for a fourth maximum number of the reported CSI and the CSI report configurations.
Example 21 may be combined with any of Examples 13-20 and further includes transmitting, to the UE, a triggering indication for the CSI report based on the rank-specific CSI report configuration.
Example 22 may be combined with any of Examples 13-21 and further includes that the CSI report includes a CSI report configuration indicator (CRCI) associated with the rank-specific CSI report configuration.
Example 23 may be combined with any of Examples 13-22 and further includes that the transmitting the rank-specific CSI report configuration further includes: transmitting, to the UE, an indication of an association between multiple rank-specific CSI report configurations that include the rank-specific CSI report configuration.
Example 24 may be combined with any of Examples 13-23 and further includes that the CSI report includes a codebook indicator (CI) indicating a codebook used for the CSI measurement information.
Example 25 is an apparatus for wireless communication for implementing a method as in any of Examples 1-24.
Example 26 is an apparatus for wireless communication including means for implementing a method as in any of Examples 1-24.
Example 27 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 1-24.

Claims

A method of wireless communication at a user equipment (UE) (102) , comprising:

receiving (304) , from a network entity (104) , a rank-specific channel state information (CSI) report configuration indicating rank-specific parameters for a CSI report; and

transmitting (310) , to the network entity (104) , the CSI report including CSI measurement information for a channel state information-reference signal (CSI-RS) , the CSI measurement information being associated with the rank-specific parameters.
The method of claim 1, wherein the rank-specific CSI report configuration jointly configures a set of parameters for each of the rank-specific parameters for the CSI report.
The method of claim 1, wherein the rank-specific CSI report configuration configures the rank-specific parameters separately for each rank-specific CSI report configuration.
The method of any of claims 1-3, wherein the rank-specific parameters comprise at least one of:

a codebook configuration,

a rank restriction, or

a power offset between the CSI-RS and a physical downlink shared channel (PDSCH) .
The method of any of claims 1-4, further comprising:

receiving (308) , from the network entity (104) , a single CSI-RS for the CSI measurement information, the single CSI-RS being associated with the rank-specific CSI report configuration.
The method of any of claims 1-4, further comprising:

receiving (308) , from the network entity (104) , a plurality of CSI-RSs for the CSI measurement information, the CSI-RS being one of the plurality of CSI-RSs.
The method of any of claims 1-6, further comprising:

transmitting (302) , to the network entity (104) , a UE capability report indicating a capability of the UE (102) for CSI reporting based on the rank-specific CSI report configuration.
The method of claim 7, wherein the UE capability report indicates at least one of:

a first capability for a first maximum number of configured codebooks,

a second capability for a second maximum number of reported CSI,

a third capability for a third maximum number of CSI report configurations; or

a fourth capability for a fourth maximum number of the reported CSI and the CSI report configurations.
The method of any of claims 1-8, further comprising:

receiving (306) , from the network entity (104) , a triggering indication for the CSI report based on the rank-specific CSI report configuration.
The method of any of claims 1-9, wherein the CSI report includes a CSI report configuration indicator (CRCI) associated with the rank-specific CSI report configuration.
The method of any of claims 1-10, wherein the receiving (304) the rank-specific CSI report configuration further comprises:

receiving (304) , from the network entity (104) , an indication of an association between multiple rank-specific CSI report configurations that include the rank-specific CSI report configuration.
The method of any of claims 1-11, wherein the CSI report includes a codebook indicator (CI) indicating a codebook used for the CSI measurement information.
A method of wireless communication at a network entity (104) , comprising:

transmitting (304) , to a user equipment (UE) (102) , a rank-specific channel state information (CSI) report configuration indicating rank-specific parameters for a CSI report; and

receiving (310) , from the UE (102) , the CSI report including CSI measurement information for a channel state information-reference signal (CSI-RS) , the CSI measurement information being associated with the rank-specific parameters.
The method of claim 13, wherein the rank-specific CSI report configuration jointly configures a set of parameters for each of the rank-specific parameters for the CSI report.
The method of claim 13, wherein the rank-specific CSI report configuration configures the rank-specific parameters separately for each rank-specific CSI report configuration.
An apparatus for wireless communication comprising a memory, a transceiver, and a processor coupled to the memory and the transceiver, the apparatus being configured to implement a method as in any of claims 1-15.