WO2024168866A1

WO2024168866A1 - Channel state information (csi) prediction

Info

Publication number: WO2024168866A1
Application number: PCT/CN2023/076917
Authority: WO
Inventors: Yushu Zhang
Original assignee: Google LLC
Current assignee: Google LLC
Priority date: 2023-02-17
Filing date: 2023-02-17
Publication date: 2024-08-22
Anticipated expiration: 2025-08-17
Also published as: CN120642231A; EP4649600A1

Abstract

This disclosure provides systems, devices, apparatus, and methods, including computer programs encoded on storage media for CSI prediction. A UE (102) performs (310) a channel state information (CSI) prediction for one or more future time slots based on a measurement of a CSI reference signal (CSI-RS) on a CSI-RS resource. The UE (102) sends (312), to a network entity, the CSI prediction for the one or more future time slots.

Description

CHANNEL STATE INFORMATION (CSI) PREDICTION

TECHNICAL FIELD

The present disclosure relates generally to wireless communication, and more particularly, to channel state information (CSI) prediction.

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, 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. For example, a network entity, such as a base station or a unit of a base station, uses CSI reporting to select a digital precoder for a user equipment (UE) . However, in some situations, a UE sends another CSI report while the previous CSI report is still valid. Such unnecessary CSI reporting increases the system overhead, which may cause performance degradation in the wireless communication systems.

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, uses channel state information (CSI) reporting to select a digital precoder for a user equipment (UE) . Precoding supports multiple-input multiple-output (MIMO) communications. The network entity may configure a CSI report by radio resource control (RRC) signaling. To measure wireless channel characteristics, the UE receives a channel state information reference signal (CSI-RS) on a channel measurement resource (CMR) . The network entity may also configure an interference measurement resource (IMR) for the UE to measure interference. Using the configured CMR and IMR, the UE measures the CSI-RS and interference. Then, the UE sends a corresponding CSI report to the network entity.

Conventionally, the UE takes channel measurements during a CMR/IMR time duration and later transmits the CSI report based on those measurements performed in the past. However, the CSI may become inaccurate shortly after the network entity receives the CSI report and before a next CSI reporting slot. If this occurs, the network entity may select a precoder or other downlink parameters based on inaccurate information for the current channel conditions. Further, the network entity is unable to determine whether a previously reported CSI is outdated (or not) for the purposes of triggering an aperiodic CSI report at a certain time or configuring a periodic or semi-persistent CSI report with a certain periodicity.

For example, if an interval between two CSI reports is too large, the network entity transmits the downlink signal based on outdated CSI for at least a portion of the interval, which may result in a performance loss of the wireless communication system. In another example, if the interval for the two CSI reports is too small, the UE sends unnecessary (e.g., too many/too frequent) CSI reports. In a “too small” situation, UE does not have to send the second CSI report because the first CSI report is still valid. Such unnecessary CSI reporting increases the system overhead, which may cause performance degradation in the wireless communication systems.

Aspects of the present disclosure address the above-noted and other deficiencies by predicting the CSI in future time slots. In some examples, the UE performs machine learning inference based on the previously measured CSIs to predict the CSI(s) in one or more future time slots. The network entity might transmit a first control signal configuring at least one CSI report configuration for the CSI report with CSI prediction based on at least one CSI-RS resource and configuring a codebook for the CSI report with CSI prediction. As one example, the network entity might transmit a second control signal triggering the configured at least one CSI-RS resource and/or the CSI report configuration for the CSI report with CSI prediction. Then, the network entity transmits at least one CSI-RS on the at least one CSI-RS resource. Based on CSI-RS measurements on the at least one CSI-RS resource, the UE performs the CSI prediction for time slot (s) after the CSI report time slot or after the last symbol of the CSI-RS resource. Then the UE transmits the CSI report with the CSI prediction to the network entity. With the predicted CSI (s) for the one or more future time slots, the network entity does not need to trigger the CSI measurement and report in such one or more future time slots.

According to some aspects, a UE performs a channel state information (CSI) prediction for one or more future slots based on a measurement of a CSI reference signal (CSI-RS) on a CSI-RS resource. The UE sends, to a network entity, the CSI prediction for the one or more future slots.

According to some aspects, a network entity configures at least one CSI report with CSI prediction based on a CSI-RS resource. The network entity receives, from a UE, the at least one CSI report with CSI prediction for one or more future slots.

Advantageously, based on the predicted CSI (s) for the one or more future time slots, the network entity avoids triggering the CSI measurement and report procedure in the one or more future time slots. As a result, the UE does not have to measure the CSI (s) and does not send CSI reports that provide little useful information, thus saving UE and network resources and also improving the system performance.

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. 2 is a signaling diagram illustrating an example of communications between a user equipment (UE) and a network entity for CSI prediction.

FIG. 3 is a block diagram illustrating an example of the UE behavior on CSI report with CSI prediction.

FIG. 4 is a block diagram illustrating an example of the network entity behavior on CSI report with CSI prediction.

FIG. 5 is a block diagram illustrating an example of CSI report with CSI prediction.

FIG. 6 is a block diagram illustrating an example of the priority for CSI report with CSI prediction.

FIG. 7 is a block diagram illustrating another example of the priority for CSI report with CSI prediction.

FIG. 8 is a block diagram illustrating yet another example of the priority for CSI report with CSI prediction.

FIG. 9 is a block diagram illustrating an example of the priority for eType2 codebook based CSI report with CSI prediction.

FIG. 10 is a block diagram illustrating another example of the priority for eType2 codebook based CSI report with CSI prediction.

FIG. 11 is a block diagram illustrating yet an example of the priority for eType2 codebook based CSI report with CSI prediction.

FIG. 12 is a flowchart of a method of wireless communication at a UE for CSI report with CSI prediction.

FIG. 13 is a flowchart of a method of wireless communication at a network entity for CSI report with CSI prediction.

FIG. 14 is a diagram illustrating a hardware implementation for an example UE apparatus.

FIG. 15 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) . 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 104a/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. Associated DUs 108 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 might relay communications between the UEs 102 and the core network. The base stations 104 may be associated with macrocells for high-power cellular base stations and/or small cells for low-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 cell structure 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 114 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. The sidelink communication/D2D link may also use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH) , a physical sidelink discovery channel (PSDCH) , a physical sidelink shared channel (PSSCH) , and/or a physical sidelink control channel (PSCCH) , to communicate information between UEs 102a and 102s. 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 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 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 might or might 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 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 with an RU 106 and a BBU 112 that includes a DU 108 and a CU 110, or as 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 CSI prediction component 140 configured to perform a CSI prediction for one or more future time slots based on a measurement of a CSI reference signal (CSI-RS) on a CSI-RS resource. The CSI prediction component 140 is further configured to send, to a network entity, the CSI prediction for the one or more future time slots.

In certain aspects, any of the base stations 104 or a network entity of the base stations 104 may include a report configuration component 150 configured to configure at least one CSI report with CSI prediction based on a CSI-RS resource. The report configuration component 150 is further configured to receive, from a UE, the at least one CSI report with CSI prediction for one or more future time slots.

Accordingly, FIG. 1 describes a wireless communication system that may be implemented in connection with aspects of one or more other figures described herein, such as aspects illustrated in FIGs. 2-15. 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.

The network entity 104 uses CSI reporting to select a digital precoder for a user equipment UE. The network entity 104 may configure a CSI report by RRC signaling. To measure wireless channel characteristics, the UE 102 receives a CSI-RS on a CMR. The network entity 104 may also configure an IMR for the UE to measure interference. Using the configured CMR and IMR, the UE measures the CSI-RS and interference.

Conventionally, the UE takes channel measurements during a CMR/IMR time duration and later transmits the CSI report based on those measurements performed in the past. However, the CSI may become inaccurate shortly after the network entity receives the CSI report and before a next CSI reporting slot. For example, if an interval between two CSI reports is too large, the network entity transmits the downlink signal based on outdated CSI for at least a portion of the interval, which may result in a performance loss of the wireless communication system. In another example, if the interval for the two CSI reports is too small, the UE sends unnecessary (e.g., too many/too frequent) CSI reports. In a “too small” situation, UE does not have to send the second CSI report because the first CSI report is still valid. Such unnecessary CSI reporting increases the system overhead, which may cause performance degradation in the wireless communication system.

In some examples, the UE 102 can predict the CSI in future slots. In this disclosure, the terms “slot” and “time slot” are used interchangeably. In one example, the UE 102 can perform inference based on the previously measured CSIs to predict the CSI (s) in one or more future slots. With the predicted CSI for future slot (s) , the network entity does not need to trigger the CSI measurement and report in such slot (s) .

FIG. 2 is a signaling diagram 200 illustrating an example of communications between a user equipment (UE) and a network entity for CSI prediction. The network entity 104 may correspond to a base station or a unit of a base station, such as the RU 106, the DU 108, the CU 110, etc. Referring to FIG. 2, the UE 102 may send 203 a UE capability report indicating the UE capabilities including at least whether the UE supports CSI report with CSI prediction. For another example, the network entity may receive the UE capability from a core network (e.g., Access and Mobility Management Function (AMF) ) or another network entity.

Based on the received UE capabilities, the network entity 104 transmits 204 a first control signaling configuring at least one CSI report configuration for CSI report with CSI prediction based on at least one CSI-RS resource. The first control signaling may further configure a codebook for the CSI report. The network entity may transmit the first control signaling by RRC signaling, e.g., RRCReconfiguration or CSI-ReportConfig. In one example, the first control signaling may further configure at least one parameter enabling the CSI report with CSI prediction.

In some implementations, for semi-persistent CSI-RS and/or CSI report or aperiodic CSI-RS and/or CSI report, the network entity may transmit a second control signaling, e.g., MAC CE or DCI, triggering the CSI-RS. The network entity may transmit 206 the second control signaling triggering the configured at least one CSI-RS resource and/or the at least one CSI report configuration for CSI report with CSI prediction.

Then the network entity may transmit 208 the CSI-RS on the at least one CSI-RS resource for CSI report with CSI prediction. After receiving the CSI-RS on the at least one CSI-RS resource, the UE may perform 210 CSI measurement and the CSI prediction for slot (s) after the CSI report slot or the last symbol of the CSI-RS resource. Then the UE transmits 212 the CSI report with the CSI prediction to the network entity. The network entity 104 may skip 214 triggering a subsequent CSI report or CSI-RS based on the CSI prediction in the CSI report.

FIG. 3 is a block diagram illustrating an example of the UE behavior on CSI report with CSI prediction. The UE 102 may transmit 303 the UE capability on CSI report with CSI prediction. In some examples, the UE 102 may transmit 303 the UE capability on CSI report with CSI prediction indicating at least one of: whether the UE supports CSI report with CSI prediction, the maximum number of configured CSI-RS resources for CSI report with CSI prediction; the maximum number of CSI-RS resources in a slot for CSI report with CSI prediction; the maximum number of configured CSI-CSI report configurations with CSI prediction; the maximum number of CSI-RS report configurations in a slot for CSI report with CSI prediction; the maximum number of predicted CSIs for further slots; the supported slot offset (s) between the last measured slot and the first predicted slot; the supported slot offset (s) between each predicted slots.

The UE 102 may receive 304 a first control signaling configuring at least one CSI report configuration for CSI report with CSI prediction based on at least one CSI-RS resource. The first control signaling may further configure a codebook for the CSI report. The UE 102 may receive 304 the first control signaling by RRC signaling, e.g., RRCReconfiguration or CSI-ReportConfig. In one example, the first control signaling may further configure at least one parameter enabling the CSI report with CSI prediction.

In some implementations, for semi-persistent CSI-RS and/or CSI report or aperiodic CSI-RS and/or CSI report, the UE 102 may receive 306 a second control signaling, e.g., MAC CE or DCI, triggering the CSI-RS. The UE 102 may receive 306 the second control signaling triggering the configured at least one CSI-RS resource and/or CSI report configuration for CSI report with CSI prediction.

Then the UE 102 may receive 308 the CSI-RS on the at least one CSI-RS resource for CSI report with CSI prediction. After receiving the CSI-RS on the at least one CSI-RS resource, the UE may perform 310 the CSI prediction for slot (s) after the CSI report slot or the last symbol of the CSI-RS resource, based on CSI measurement on the at least one CSI-RS resource. Then the UE transmits 312 the CSI report with the CSI prediction to the network entity. For example, the UE may transmit 312 the CSI report with CSI (s) for slot (s) after the CSI report slot or the last CSI measurement slot.

FIG. 4 is a block diagram illustrating an example of the network entity behavior on CSI report with CSI prediction. Referring to FIG. 4, the network entity 104 may receive 403 a UE capability report indicating the UE capabilities including at least whether the UE supports CSI report with CSI prediction. For another example, the network entity may receive the UE capability from a core network (e.g., Access and Mobility Management Function (AMF) ) or another network entity.

Based on the received UE capabilities, the network entity 104 transmits 404 a first control signaling configuring at least one CSI report configuration for CSI report with CSI prediction based on at least one CSI-RS resource. The first control signaling may further configure a codebook for the CSI report. The network entity 104 may transmit the first control signaling by RRC signaling, e.g., RRCReconfiguration or CSI-ReportConfig. In one example, the first control signaling may further configure at least one parameter enabling the CSI report with CSI prediction.

In some implementations, for semi-persistent CSI-RS and/or CSI report or aperiodic CSI-RS and/or CSI report, the network entity may transmit a second control signaling, e.g., MAC CE or DCI, triggering the CSI-RS. The network entity 104 may transmit 406 the second control signaling triggering the configured at least one CSI-RS resource and/or the at least one CSI report configuration for CSI report with CSI prediction.

Then the network entity may transmit 408 the CSI-RS on the at least one CSI-RS resource for CSI report with CSI prediction. The network entity 104 receives 412 the CSI report with the CSI prediction for slot (s) after the CSI report slot or the last CSI measurement slot. Then, the network entity 104 may skip 414 triggering a subsequent CSI report or CSI-RS based on the CSI prediction in the at least one CSI report.

FIG. 5 is a block diagram illustrating an example of CSI report with CSI prediction. The UE reports the CSI for future slots based on the measurement of one or more CSI-RS instances for a CSI-RS resource. The UE does not need to report the CSI in the future slots. For example, the UE measures one or more instances of the CSI-RS on the CSI-RS resource. The UE predicts, using machine learning, parameters of CSI for the one or more future time slots after the CSI report slot or the last CSI measurement slot. The parameters of CSI may include at least one of rank indicator (RI) , precoder matrix indicator (PMI) , channel quality indicator (CQI) and layer indicator (LI) .

Referring to FIG. 5, the UE measures one or more instances (e.g., CSI-RS instances 508A, 508B, 508C) of the CSI-RS on the CSI-RS resource. The UE predicts, for example, by using machine learning, the parameters of CSI for the future slots. The future slots may include slots after the CSI report slot 531 or the last CSI measurement slot 508C. As illustrated in FIG. 5, future slots may include the slot 532 for the UE to send a second CSI report, and the slot 533 for the UE to send a third CSI report. The UE predicts the CSI for the future slots 532 and 533 and send the CSI prediction for the future slots 532 and 533. Based on the CSI prediction for the future slots 532 and 533, the network entity 104 may skip triggering one or more subsequent CSI-RSs (e.g., CSI-RS instances 508D, 508E) and/or subsequent CSI reports (e.g., (e.g., second CSI report 512B, third CSI report 512C) .

In this way, the network entity avoids triggering the CSI measurement and report procedure in the one or more future time slots. As a result, the UE does not have to measure the CSI (s) and does not send CSI reports that provide little useful information, thus saving UE and network resources and also improving the system performance.

The network entity may configure the CSI report configuration with CSI prediction based on the Type1 codebook, Type2 codebook, or eType2 codebook. Different CSI report configurations will be discussed below.

In some examples, the network entity configures the CSI report configuration with CSI prediction based on the Type1 codebook by the first control signaling, e.g., RRC signaling. The Type1 codebook is defined in 3GPP TS 38.314 section 5.2.2.2.1. The network entity may further configure a codebook subset restriction for the UE to search precoders within the configured codebook subset by the first and/or second control signaling.

In some examples, for a CSI-RS resource, the UE reports more than one PMIs for future slots and reports other elements, e.g., RI, CQI, and/or LI, measured in one slot, e.., the first predicted slot. In this disclosure, the “A/B” indicates “A and/or B” . In some other implementations, for a CSI-RS resource, the UE reports more than one PMIs and RIs for future slots and reports other elements, e.g., CQI and/or LI, measured in one slot, e.g., the first predicted slot. In some other implementations, for a CSI-RS resource, the UE reports more than one PMIs and CQIs for future slots and reports other elements, e.g., RI and/or LI, measured in one slot, e.g., the first predicted slot. In some other implementations, for a CSI-RS resource, the UE reports more than one CSIs, e.g., more than one RI, CQI, PMI, and/or LI for all the future slots. In some other implementations, the network entity may configure the report content for each predicted slots by the first and/or second control signaling.

If UE reports multiple CQIs in multiple slots, in some implementations, the UE may report the absolute wideband CQI for the first predicted slot and report differential subband CQIs for each subband for the first predicted slot and the other slot (s) with the wideband CQI as reference. In some implementations, the UE may report the absolute average wideband CQI across all the predicted slot and report differential subband CQIs for each subband for all the slots with the average wideband CQI as reference. In some other implementations, the UE may report the absolute wideband CQI for the first predicted slot and report differential subband CQIs for each subband for the first predicted slot and differential wideband CQIs and subband CQIs for the other predicted slots with the wideband CQI as reference. In some other implementations, the UE may report the absolute average wideband CQI across all the predicted slots and report differential wideband CQIs and subband CQIs for all the predicted slots with the average wideband CQI as reference. In some other implementations, the UE may report the absolute wideband CQI for each predicted slot and report differential subband CQIs for each subband for each predicted slot with the reported wideband CQI for the slot as reference.

In some examples, the UE may report a set of common CRI (s) for all predicted slot (s) . In some other implementations, the UE may report separate CRI (s) for each predicted slot (s) .

In some examples, the UE may send at least one CSI report without CSI prediction, e.g., CSI measured based on the CSI-RS before the minimum preparation delay for CSI report before the CSI report slot, in addition to the CSI report with CSI prediction. In some other examples, the UE may only send the CSI report with CSI prediction. In some other examples, the network entity configures whether to send at least one CSI report without CSI prediction, in addition to the CSI report with CSI prediction, by the first and/or the second control signaling.

In some examples, the network entity configures time information for CSI prediction, including at least one of the parameters: the slot index for first CSI prediction slot, e.g., the slot offset between the first CSI prediction slot and the CSI report slot, the slot offset between each CSI prediction slots, and the number of CSI prediction slots by the first and/or second control signaling.

In some other examples, the UE reports time information for CSI prediction, including at least one of the elements: the slot index for first CSI prediction slot, e.g., the slot offset between the first CSI prediction slot and the CSI report slot, the slot offset between each CSI prediction slots, and the number of CSI prediction slots in the CSI report.

FIG. 6 is a block diagram illustrating an example of the priority for CSI report with CSI prediction, in Type1 codebook based full CSI report. In some examples, the UE reports the CSI (s) for the predicted slot (s) based on the configured codebook and/or codebook subset restriction. For each CSI prediction slot, the UE reports full precoder information, e.g., wideband precoder information X1, and wideband/subband precoder information X2, where X1 and X2 are defined in 38.212 section 6.3.1.1.2.

The UE transmits the PMIs based on the order of the priority, and the UE may drop the PMIs with lower priority if the total payload size for all the CSI report (s) that are configured or triggered to be reported in a Physical Uplink Shared Channel (PUSCH) exceeds the maximum payload size for CSI report in the PUSCH. UE may be triggered to report one or more CSI reports in a single PUSCH. Different CSI reports may correspond to different CSI report configurations. The UE may determine the priority for the reported PMIs based on at least one of the factors: whether the PMI is wideband PMI or subband PMI, the subband index for the PMI, and the predicted slot index for the PMI. The UE may transmit the PMIs based on frequency-domain first order, e.g., the UE transmits the PMIs for each subband in a predicted slot first and then PMIs for each subband for the next predicted slot or time-domain first order, e.g., the UE transmits the PMI in the first subband in the predicted slots and then the PMI for the second subband in the predicted slots.

In some implementations, the UE reports the predicted CSI (s) in short PUCCH, e.g., PUCCH with less than or equal to 4 symbols. In some other implementations, the UE reports the predicted CSI (s) in long PUCCH, e.g., PUCCH with more than 4 symbols, or PUSCH. The UE may report the predicted CRI, RI, and/or CQI for the first codeword in CSI part 1 and predicted PMI and/or CQI for the second codeword in CSI part 2.

Referring to FIG. 6, in some examples, if the network entity configures the UE reports the wideband PMI and/or subband PMIs for each predicted slot, the UE transmits the wideband PMI and/or subband PMIs for the first predicted slots for all the configured or triggered CSI reports with the first priority 611A. Then the UE transmits the wideband PMI and/or subband PMIs for the even predicted slot index (es) within the predicted slots for a CSI report 1 with the second priority 611B, and the UE transmits the wideband PMI and/or subband PMIs for the odd predicted slot index (es) within the predicted slots for the CSI report 1 with the third priority 611C, and so on. The UE transmits the wideband PMI and/or subband PMIs for the even predicted slot index (es) within the predicted slots for a CSI report N with the priority 611D, and the UE transmits the wideband PMI and/or subband PMIs for the odd predicted slot index (es) within the predicted slots for the CSI report N with the priority 611E, lower than the priority 611D.

As illustrated in FIG. 6, as an example, if the UE transmits the predicted CSI for slot {4, 8, 12, 20, 24} , the UE transmits the CSI for slot 4 (first predicted slot) with the first priority 611A, the CSI for slot 8 and 20 (even predicted slot index) with the second priority 611B, and the CSI for slot 12 and 24 (odd predicted slot index) with the third priority 611C.

FIG. 7 is a block diagram illustrating another example of the priority for CSI report with CSI prediction, in Type1 codebook based full CSI report. In some examples, if the network entity configures the UE reports the wideband PMI and/or subband PMIs for each predicted slot, the UE transmits the wideband PMI and/or subband PMIs for the first predicted slots for all the CSI reports with the first priority 711A. Then the UE transmits the wideband PMI and/or subband PMIs for the first half of the predicted slot (s) for a CSI report 1with the second priority 711B, and the UE transmits the wideband PMI and/or subband PMIs for the remaining slot (s) for the CSI report 1 with the third priority 711C, and so on. The UE transmits the wideband PMI and/or subband PMIs for the first half of the predicted slot (s) for a CSI report N with the priority 711D, and the UE transmits the wideband PMI and/or subband PMIs for the remaining slot (s) for the CSI report N with the priority 711E, lower than the priority 711D.

Referring to FIG. 7, as an example, if the UE transmits the predicted CSI for slot {4, 8, 12, 20, 24} , the UE transmits the CSI for slot 4 (first predicted slot) with the first priority 711A, the CSI for slot 8 and 12 (first half of the predicted slot (s) ) with the second priority 711B, and the CSI for slot 20 and 24 (the remaining slot (s) with the third priority 711C.

FIG. 8 is a block diagram illustrating yet another example of the priority for CSI report with CSI prediction, in Type1 codebook based full CSI report. In some examples, if the network entity configures the UE reports the subband PMIs for each predicted slot, the UE transmits the wideband PMI for all the predicted slots for all the CSI reports with the first priority 811A. Then the UE transmits the subband PMIs for the even subbands for all the predicted slots for a CSI report 1 with the second priority 811B, and the UE transmits the subband PMIs for the odd subbands for all the predicted slots for the CSI report 1 with the third priority 811C, and so on. The UE transmits the subband PMIs for the even subbands for all the predicted slots for a CSI report N with the priority 811D, and the UE transmits the subband PMIs for the odd subbands for all the predicted slots for the CSI report N with the priority 811E, lower than the priority 711D.

FIGs. 6-8 illustrate the CSI report configuration with CSI prediction for full CSI report based on the Type1 codebook. In the full CSI report, for each CSI prediction slot, the UE reports full precoder information. Alternatively, the UE may report partial CSI report based on the Type1 codebook.

In some examples, the UE reports the CSI for the first predicted slot based on the configured codebook and/or codebook subset restriction and the UE reports the CSI(s) for the other predicted slot (s) based on the reported CSI for the first predicted slot and the configured codebook and/or codebook subset restriction. For the first CSI prediction slot, the UE reports full precoder information, e.g., wideband precoder information X1, and wideband/subband precoder information X2, where X1 and X2 are defined in 3GPP TS 38.212 section 6.3.1.1.2. For the other CSI prediction slot, the UE reports partial precoder information, e.g., precoder information X2. Then the network entity can reconstruct the reported precoder for the other CSI prediction slot based on the received precoder information for the first predicted slot and the partial precoder information for the other CSI prediction slot. Compared to the full CSI report, the difference is that in the partial CSI report, the UE only reports one full precoder information for the first CSI prediction slot and multiple partial precoder information for the multiple other predicted slots.

In some implementations, the UE reports the partial precoder information, e.g., precoder information X2, for both wideband precoder and subband precoder for the predicted slots other than the first predicted slot. In some other implementations, the UE reports the partial precoder information, e.g., precoder information X2, for subband precoder only for the predicted slots other than the first predicted slot.

In some other implementations, the UE reports a common wideband precoder information, e.g., precoder information X1, for all the predicted slots, and the UE reports a subband precoder information, e.g., precoder information X2, for each subband for all the predicted slots.

In some examples, the network entity configures the UE to report the predicted CSI for each CSI prediction slots based on full CSI or partial CSI by the first or the second control signaling.

In some examples, the network entity and the UE determines whether to report the predicted CSI for each CSI prediction slots based on full CSI or partial CSI based on the offset between every two predicted slots and a threshold. If the offset is above the threshold, the UE reports the predicted CSI for each CSI prediction slots based on the full CSI report; otherwise, the UE reports the predicted CSI for each CSI prediction slots based on the partial CSI report. The threshold may be predefined or configured by the network entity by the first or the second control signaling or reported by the UE via UE capability report.

In some examples, the UE reports an indicator indicating whether the predicted CSI for each CSI prediction slots is based on full CSI or partial CSI. In some implementations, the UE reports the indicator in the CSI report, e.g., CSI part 1. In some other implementations, the UE reports the indicator by UE capability report.

The network entity may configure the CSI report configuration with CSI prediction based on the Type2 or eType2 codebook. In some examples, the network entity configures the CSI report configuration with CSI prediction based on the Type2 or eType2 codebook by the first control signaling, e.g., RRC signaling. The Type2 and eType2 codebook is defined in 3GPP TS 38.214 section 5.2.2.2.3/4/5/6. The UE may report the PMI based on the configured Type2 or eType2 codebook.

As an example, the UE reports full precoder information based on Type2/eType2 codebook for each predicted slot. For each CSI prediction slot, the UE reports full precoder information, e.g., wideband precoder information X1, and wideband/subband precoder information X2, where X1 and X2 are defined in 3GPP TS 38.212 section 6.3.1.2.2.

For Type2 codebook based CSI report, the UE can transmit the Type2 CSI based on the same priority rules as illustrated in FIGs. 6-8. The UE transmits the first precoder information X1 and second precoder information X2 indicating the beam index to identify the matrix W1 and beam combining vectors for each subband W2 respectively. The network entity can reconstruct the precoder for each subband based on:
W = W₁W₂

In one example, the codebook for W1 selection can be defined as follows:

B = [b₁ b₂ ... b_L]

where, denotes Kronecker product; L indicates number of beams which are configured by RRC signaling; N₁, N₂, O₁, and O₂ are related to the number of ports and oversampling factor in horizontal and vertical domain, which are configured by RRC signaling, and the candidate values should be determined based on number of CSI-RS ports. The codebook contains the precoders with different value of m and n. In one example, candidate values are defined as Table 5.2.2.2.1-2 in 3GPP TS 38.214.

The UE transmits the PMIs based on the order of the priority, and the UE may drop the PMIs with lower priority if the payload size for the CSI report exceeds the maximum payload size for CSI report.

For eType2 codebook, the UE may determine the priority for the reported precoder information based on at least one of the factors: the indication of the precoder information, e.g., whether it is for precoder information X1 or X2, the priority for the precoder information, and the predicted slot index for the precoder information.

FIG. 9 is a block diagram illustrating an example of the priority for eType2 codebook based CSI report with CSI prediction. Referring to FIG. 9, in some examples, if the network entity configures the UE reports the predicted CSI based on eType2 codebook, the UE transmits the wideband precoder information X1 and/or subband precoder information X2 for the first predicted slots for all the CSI reports with the first priority 911A. Then the UE transmits the wideband precoder information X1 and/or subband precoder information X2 for the even predicted slot index (es) within the predicted slots for a CSI report 1 with the second priority 911B, and the UE transmits the wideband precoder information X1 and/or subband precoder information X2 for the odd predicted slot index (es) within the predicted slots for the CSI report 1 with the third priority 911C, and so on. The UE transmits the wideband precoder information X1 and/or subband precoder information X2 for the even predicted slot index (es) within the predicted slots for a CSI report N with the priority 911D, and the UE transmits the wideband precoder information X1 and/or subband precoder information X2 for the odd predicted slot index (es) within the predicted slots for the CSI report N with the priority 911E, lower than the priority 911D.

In one example, if the UE transmits the predicted CSI for slot {4, 8, 12, 20, 24} , the UE transmits the CSI for slot 4 with the first priority 911A, the CSI for slot 8 and 20 with the second priority911B, and the CSI for slot 12 and 24 with the third priority 911C.

FIG. 10 is a block diagram illustrating another example of the priority for eType2 codebook based CSI report with CSI prediction. Referring to FIG. 10, in some examples, if the network entity configures the UE reports with the predicted CSI based on eType2 codebook, the UE transmits the wideband precoder information X1 and/or subband precoder information X2 for the first predicted slots for all the CSI reports with the first priority 1011A. Then the UE transmits the wideband precoder information X1 and/or subband precoder information X2 for the first half of the predicted slot (s) for a CSI report 1 with the second priority 1011B, and the UE transmits the wideband precoder information X1 and/or subband precoder information X2 for the remaining slot (s) for the CSI report 1 with the third priority 1011C, and so on. The UE transmits the wideband precoder information X1 and/or subband precoder information X2 for the first half of the predicted slot (s) for a CSI report N with the priority 1011D, and the UE transmits the wideband precoder information X1 and/or subband precoder information X2 for the remaining slot (s) for the CSI report N with the priority 1011E, lower than the priority 1011D.

In one example, if the UE transmits the predicted CSI for slot {4, 8, 12, 20, 24} , the UE transmits the CSI for slot 4 with the first priority, the CSI for slot 8 and 12 with the second priority and the CSI for slot 20 and 24 with the third priority.

FIG. 11 is a block diagram illustrating yet an example of the priority for eType2 codebook based CSI report with CSI prediction. In some examples, if the network entity configures the UE reports the predicted CSI based on eType2 codebook, the UE transmits the wideband precoder information X1 for all the predicted slots for all the CSI reports with the first priority 1111A. Then the UE transmits the high priority part for the subband precoder information X2 for all the predicted slots for a CSI report 1 with the second priority 1111B, and the UE transmits the low priority part for the subband precoder information X2 for all the predicted slots for the CSI report 1 with the third priority 1111C, and so on. The UE transmits the high priority part for the subband precoder information X2 for all the predicted slots for a CSI report N with the priority 1111D, and the UE transmits the low priority part for the subband precoder information X2 for all the predicted slots for the CSI report N with the priority 1111E, lower than the priority 1111D.

In some examples, the priority for the subband precoder information X2 can be determined based on the energy of the beam combining coefficients, e.g., the coefficients with higher energy have higher priority than the coefficients with lower energy, where the beam combining coefficients indicates the coefficients in matrix The wideband precoder information can include the indication of W1 and frequency domain basis indication of W_f. Then the network entity can reconstruct the precoder as follows:

where, W₁ is the same as Type2 codebook, which indicates L Spatial Domain basis (SD-basis) ; indicates a beam combining weight with the dimension of 2L by M, and W_f indicates a Digital Fourier Transform (DFT) based Frequency Domain basis (FD-basis) with the dimension of N₃ by M, where N₃ is the number of subbands and M is the number of FD basis.

FIGs. 9-11 illustrate the CSI report configuration with CSI prediction for full CSI report based on the Type2 or eType2 codebook. In the full CSI report, for each CSI prediction slot, the UE reports full precoder information. Alternatively, the UE may report partial CSI report based on the Type2 or eType2 codebook.

In some examples, the UE reports a first common precoder information for CSI for all the predicted slots and a second separate precoder information for CSI for each predicted slot. In some examples, for Type2 based codebook, the UE reports a set of common beam index (es) indicating a common SD basis W₁ for all the predicted slots, and reports different beam combing vectors W₂ for different predicted slots.

In some examples, for eType2 based codebook, the UE reports a set of common beam index (es) indicating a common SD basis W₁ for all the predicted slots, and reports different beam combining vectors W₂ and different FD basis W_f for different predicted slots. In some other examples, for eType2 based codebook, the UE reports a set of common beam index (es) indicating a common SD basis W₁ and a set of common FD basis Wf for all the predicted slots, and reports different beam combining vectors W₂. In some other examples, for eType2 based codebook, the network entity may configure whether the FD basis should be common for all the predicted CSI by the first or the second control signaling.

In some other examples, for eType2 based codebook, the UE may report an indicator indicating whether the FD basis should be common for all the predicted CSI. The UE may transmit the indicator in the CSI, e.g., CSI part 1. Alternatively, the UE may transmit the indicator via UE capability report.

In some examples, the UE reports an indicator indicating whether the predicted CSI for each CSI prediction slots is based on full CSI or partial CSI. In some implementations, the UE reports the indicator in the CSI report, e.g., CSI part 1. In some other implementations, the UE reports the indicator by UE capability report. FIGS. 2-11 illustrate examples of the CSI report with CSI prediction and priority rules of the CSI report configuration with CSI prediction based on the Type 1, Type2 or eType2 codebook. FIGs. 12-13 show methods for implementing one or more aspects of FIGs. 2-11. In particular, FIG. 12 shows an implementation by the UE 102 of the one or more aspects of 2-11. FIG. 13 shows an implementation by the network entity 104 of the one or more aspects of FIGs. 2-11.

FIG. 12 illustrates a flowchart 1200 of a method of wireless communication at a UE. With reference to FIGs. 1 and 14, the method may be performed by the UE 102, the UE apparatus 1402, etc., which may include the memory 1426', 1406', 1416, and which may correspond to the entire UE 102 or the entire UE apparatus 1402, or a component of the UE 102 or the UE apparatus 1402, such as the wireless baseband processor 1426 and/or the application processor 1406.

The UE 102 may transmit 1203, to the network entity, a UE capability report that indicates one or more UE capabilities. For example, referring to FIG. 3, the UE 102 may transmit 303 the UE capability on CSI report with CSI prediction.

The UE 102 may receive 1204 a first control signaling configuring at least one CSI report with CSI prediction based on a CSI-RS resource. For example, referring to FIG. 3, the UE 102 may receive 304 a first control signaling configuring at least one CSI report configuration for CSI report with CSI prediction based on at least one CSI-RS resource.

The UE 102 may receive 1206, from the network entity, a second control signaling triggering the at least one of: the at least one CSI report with CSI prediction, or the CSI-RS resource for the CSI prediction. For example, referring to FIG. 3, the UE 102 may receive 306 the second control signaling triggering the configured at least one CSI-RS resource and/or CSI report configuration for CSI report with CSI prediction.

The UE 102 receives 1208 the CSI-RS on the CSI-RS resource. For example, referring to FIG. 3, the UE 102 may receive 308 the CSI-RS on the at least one CSI-RS resource for CSI report with CSI prediction.

The UE 102 performs 1210 a CSI prediction for one or more future slots based on a measurement of the CSI-RS on the CSI-RS resource. For example, referring to FIG. 3, the UE may perform 310 the CSI prediction for slot (s) after the CSI report slot or the last symbol of the CSI-RS resource, based on CSI measurement on the at least one CSI-RS resource.

The UE 102 sends 1212, to the network entity, at least one CSI report with the CSI prediction for the one or more future slots. For example, referring to FIG. 3, the UE transmits 312 the CSI report with the CSI prediction to the network entity. For example, the UE may transmit 312 the CSI report with CSI (s) for slot (s) after the CSI report slot or the last CSI measurement slot. FIG. 12 describes a method from a UE-side of a wireless communication link, whereas FIG. 13 describes a method from a network-side of the wireless communication link.

FIG. 13 is a flowchart 1300 of a method of wireless communication at a network entity. With reference to FIGs. 1 and 15, 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 1506, a DU processor 1526, a CU processor 1546, etc. The one or more network entities 104 may include memory 1506’ /1526’ /1546’ , 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 1506, the DU processor 1526, or the CU processor 1546.

The network entity 104 may receive 1303, from a UE, a UE capability report that indicates one or more UE capabilities. For example, referring to FIG. 4, the network entity 104 may receive 403 a UE capability report indicating the UE capabilities including at least whether the UE supports CSI report with CSI prediction.

The network entity 104 configures 1304 at least one CSI report with CSI prediction based on a CSI-RS resource. For example, referring to FIG. 4, the network entity 104 transmits 404 a first control signaling configuring at least one CSI report configuration for CSI report with CSI prediction based on at least one CSI-RS resource.

The network entity 104 may transmit 1306, to the UE, a second control signaling triggering the at least one of: the at least one CSI report with CSI prediction, or the CSI-RS resource for the CSI prediction. For example, referring to FIG. 4, the network entity 104 may transmit 406 the second control signaling triggering the configured at least one CSI-RS resource and/or the at least one CSI report configuration for CSI report with CSI prediction.

The network entity 104 receives 1312, from the UE, at least one CSI report with the CSI prediction for the one or more future slots. For example, referring to FIG. 4, the network entity 104 receives 412 the CSI report with the CSI prediction for slot (s) after the CSI report slot or the last CSI measurement slot.

The network entity 104 may skip 1314 triggering a subsequent CSI report or CSI-RS based on the CSI prediction in the at least one CSI report. For example, referring to FIG. 4, the network entity 104 may skip 414 triggering a subsequent CSI report or CSI-RS based on the CSI prediction in the at least one CSI report. A UE apparatus 1402, as described in FIG. 14, may perform the method of flowchart 1200. The one or more network entities 104, as described in FIG. 15, may perform the method of flowchart 1300.

FIG. 14 is a diagram 1400 illustrating an example of a hardware implementation for a UE apparatus 1402. The UE apparatus 1402 may be the UE 102, a component of the UE 102, or may implement UE functionality. The UE apparatus 1402 may include an application processor 1406, which may have on-chip memory 1406’ . In examples, the application processor 1406 may be coupled to a secure digital (SD) card 1408 and/or a display 1410. The application processor 1406 may also be coupled to a sensor (s) module 1412, a power supply 1414, an additional module of memory 1416, a camera 1418, and/or other related components. For example, the sensor (s) module 1412 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 1402 may further include a wireless baseband processor 1426, which may be referred to as a modem. The wireless baseband processor 1426 may have on-chip memory 1426'. Along with, and similar to, the application processor 1406, the wireless baseband processor 1426 may also be coupled to the sensor (s) module 1412, the power supply 1414, the additional module of memory 1416, the camera 1418, and/or other related components. The wireless baseband processor 1426 may be additionally coupled to one or more subscriber identity module (SIM) card (s) 1420 and/or one or more transceivers 1430 (e.g., wireless RF transceivers) .

Within the one or more transceivers 1430, the UE apparatus 1402 may include a Bluetooth module 1432, a WLAN module 1434, an SPS module 1436 (e.g., GNSS module) , and/or a cellular module 1438. The Bluetooth module 1432, the WLAN module 1434, the SPS module 1436, and the cellular module 1438 may each include an on-chip transceiver (TRX) , or in some cases, just a transmitter (TX) or just a receiver (RX) . The Bluetooth module 1432, the WLAN module 1434, the SPS module 1436, and the cellular module 1438 may each include dedicated antennas and/or utilize antennas 1440 for communication with one or more other nodes. For example, the UE apparatus 1402 can communicate through the transceiver (s) 1430 via the antennas 1440 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 1426 and the application processor 1406 may each include a computer-readable medium /memory 1426', 1406', respectively. The additional module of memory 1416 may also be considered a computer-readable medium /memory. Each computer-readable medium /memory 1426', 1406', 1416 may be non-transitory. The wireless baseband processor 1426 and the application processor 1406 may each be responsible for general processing, including execution of software stored on the computer-readable medium /memory 1426', 1406', 1416. The software, when executed by the wireless baseband processor 1426 /application processor 1406, causes the wireless baseband processor 1426 /application processor 1406 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 1426 /application processor 1406 when executing the software. The wireless baseband processor 1426 /application processor 1406 may be a component of the UE 102. The UE apparatus 1402 may be a processor chip (e.g., modem and/or application) and include just the wireless baseband processor 1426 and/or the application processor 1406. In other examples, the UE apparatus 1402 may be the entire UE 102 and include the additional modules of the apparatus 1402.

As discussed in FIG. 1 and implemented with respect to FIG. 12, the CSI prediction component 140 is configured to perform a CSI prediction for one or more future time slots based on a measurement of a CSI reference signal (CSI-RS) on a CSI-RS resource. The CSI prediction component 140 is further configured to send, to a network entity, the CSI prediction for the one or more future time slots. The CSI prediction component 140 may be within the application processor 1406 (e.g., at 140a) , the wireless baseband processor 1426 (e.g., at 140b) , or both the application processor 1406 and the wireless baseband processor 1426. The <> 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. 15 is a diagram 1500 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 1546, which may have on-chip memory 1546'. In some aspects, the CU 110 may further include an additional module of memory 1556 and/or a communications interface 1548, both of which may be coupled to the CU processor 1546. The CU 110 can communicate with the DU 108 through a midhaul link 162, such as an F1 interface between the communications interface 1548 of the CU 110 and a communications interface 1528 of the DU 108.

The DU 108 may include a DU processor 1526, which may have on-chip memory 1526'. In some aspects, the DU 108 may further include an additional module of memory 1536 and/or the communications interface 1528, both of which may be coupled to the DU processor 1526. The DU 108 can communicate with the RU 106 through a fronthaul link 160 between the communications interface 1528 of the DU 108 and a communications interface 1508 of the RU 106.

The RU 106 may include an RU processor 1506, which may have on-chip memory 1506'. In some aspects, the RU 106 may further include an additional module of memory 1516, the communications interface 1508, and one or more transceivers 1530, all of which may be coupled to the RU processor 1506. The RU 106 may further include antennas 1540, which may be coupled to the one or more transceivers 1530, such that the RU 106 can communicate through the one or more transceivers 1530 via the antennas 1540 with the UE 102.

The on-chip memory 1506', 1526', 1546'and the additional modules of memory 1516, 1536, 1556 may each be considered a computer-readable medium /memory. Each computer-readable medium /memory may be non-transitory. Each of the processors 1506, 1526, 1546 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) 1506, 1526, 1546 causes the processor (s) 1506, 1526, 1546 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) 1506, 1526, 1546 when executing the software. In examples, the report 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 in FIG. 1 and implemented with respect to FIG. 13, the report configuration component 150 is configured to configure at least one CSI report with CSI prediction based on a CSI-RS resource. The report configuration component 150 is further configured to receive, from a UE, the at least one CSI report with CSI prediction for one or more future time slots. The report configuration component 150 may be within one or more processors of the one or more network entities 104, such as the RU processor 1506 (e.g., at 150a) , the DU processor 1526 (e.g., at 150b) , and/or the CU processor 1546 (e.g., at 150c) . The report 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 1506, 1526, 1546 configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by the one or more processors 1506, 1526, 1546, 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.

Aspects 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: performing a channel state information (CSI) prediction for one or more future time slots based on a measurement of a CSI reference signal (CSI-RS) on a CSI-RS resource; and sending, to a network entity, the CSI prediction for the one or more future time slots.

Example 2 may be combined with example 1 and includes that the sending, to the network entity, the CSI prediction for the one or more future time slots includes: sending, to the network entity, at least one CSI report with CSI prediction for the one or more future time slots.

Example 3 may be combined with any of examples 1-2 and includes that the one or more future time slots include one or more future time slots after a CSI report slot or a last CSI measurement slot, and the performing the CSI prediction for the one or more future time slots includes: measuring one or more instances of the CSI-RS on the CSI-RS resource; and predicting, using machine learning, parameters of CSI for the one or more future time slots after the CSI report slot or the last CSI measurement slot.

Example 4 may be combined with any of examples 1-3 and further includes that transmitting, to the network entity, a UE capability report that indicates one or more UE capabilities including: whether the UE supports a CSI report with CSI prediction, a maximum number of configured CSI-RS resources for the CSI report with CSI prediction, a maximum number of CSI-RS resources in a time slot for the CSI report with CSI prediction, a maximum number of configured CSI-CSI report configurations with the CSI prediction, a maximum number of CSI-RS report configurations in a time slot for the CSI report with CSI prediction, a maximum number of predicted CSIs for further time slot, one or more supported time slot offsets between a last measured time slot and a first predicted time slot, or one or more supported time slot offsets between each predicted time slots.

Example 5 may be combined with any of examples 2-4 and further includes that receiving, from a network entity, a first control signaling configuring at least one CSI report configuration for CSI report with CSI prediction based on the CSI-RS resource; and receive the CSI-RS on the CSI-RS resource.

Example 6 may be combined with example 5 and includes that the CSI report with the CSI prediction is configured based on Type1 codebook, Type2 codebook, or eType2 codebook.

Example 7 may be combined with any of examples 5-6 and includes that receiving, from the network entity, a second control signaling triggering at least one of: the at least one CSI report with CSI prediction, or the CSI-RS resource for the CSI prediction.

Example 8 may be combined with any of examples 2-7 and includes that the sending, to the network entity, the at least one CSI report with CSI prediction for the one or more future time slots includes: transmitting, to the network entity, the at least one CSI report including a full set of CSI parameters for all of the one or more future time slots.

Example 9 may be combined with any of examples 2-7 and includes that the sending, to the network entity, the at least one CSI report with CSI prediction for the one or more future time slots includes: transmitting, to the network entity, the at least one CSI report including all of CSI parameters for a first time slot of the one or more future time slots and a part of CSI parameters for other of the one or more future time slots.

Example 10 may be combined with any of examples 2-7 and includes that the sending, to the network entity, the at least one CSI report with CSI prediction for the one or more future time slots includes: transmitting, to the network entity, the at least one CSI report including one or more common CSI parameters for all of the one or more future time slots and one or more differential CSI parameters for each of the one or more future time slots.

Example 11 may be combined with any of examples 2-10 and includes that the sending, to the network entity, the at least one CSI report with CSI prediction for the one or more future time slots includes: transmitting, to the network entity, the at least one CSI report including at least one of: a slot offset between a first CSI prediction slot and a CSI report slot, a slot offset between each CSI prediction slots, or a number of CSI prediction slots in the at least one CSI report.

Example 12 may be combined with any of examples 2-11 and includes that determining an order of priority for one or more precoder matrix indicators (PMIs) in the at least one CSI report based on at least one of: whether a PMI is for wideband or subband, a subband index for the PMI; or a predicted slot index for the PMI.

Example 13 may be combined with example 12 and includes that the sending, to the network entity, the at least one CSI report with the CSI prediction for the one or more future time slots includes: transmitting, to the network entity, the one or more PMIs based on the order of priority.

Example 14 is a method of wireless communication at a network entity, including: configuring at least one CSI report configuration for CSI report with CSI prediction based on a CSI-RS resource; receiving, from a UE, the at least one CSI report with CSI prediction for one or more future time slots.

Example 15 may be combined with example 14 and includes that the at least one CSI report with the CSI prediction is configured based on Type1 codebook, Type2 codebook, or eType2 codebook.

Example 16 may be combined with any of examples 14-15 and further includes that skipping triggering a subsequent CSI report or CSI-RS based on the CSI prediction in the at least one CSI report.

Example 17 is an apparatus for wireless communication for implementing a method as in any of examples 1-16.

Example 18 is a non-transitory computer-readable medium storing computer executable code, the code when executed by at least one processor causes the at least one processor to implement a method as in any of examples 1-16.

Claims

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

performing a channel state information (CSI) prediction for one or more future time slots based on a measurement of a CSI reference signal (CSI-RS) on a CSI-RS resource; and

sending, to a network entity, the CSI prediction for the one or more future time slots.
The method of claim 1, wherein the sending, to the network entity, the CSI prediction for the one or more future time slots comprises:

sending, to the network entity, at least one CSI report with CSI prediction for the one or more future time slots.
The method of any of claims 1-2, wherein the one or more future time slots comprise one or more future time slots after a CSI report slot or a last CSI measurement slot, and wherein the performing the CSI prediction for the one or more future time slots comprises:

measuring one or more instances of the CSI-RS on the CSI-RS resource; and

predicting, using machine learning, parameters of CSI for the one or more future time slots after the CSI report slot or the last CSI measurement slot.
The method of any of claims 1-3, further comprising:

transmitting, to the network entity, a UE capability report that indicates one or more UE capabilities including: whether the UE supports a CSI report with CSI prediction, a maximum number of configured CSI-RS resources for the CSI report with CSI prediction, a maximum number of CSI-RS resources in a time slot for the CSI report with CSI prediction, a maximum number of configured CSI-CSI report configurations with the CSI prediction, a maximum number of CSI-RS report configurations in a time slot for the CSI report with CSI prediction, a maximum number of predicted CSIs for further time slot, one or more supported time slot offsets between a last measured time slot and a first predicted time slot, or one or more supported time slot offsets between each predicted time slots.
The method of any of claims 2-4, the method further comprising:

receiving, from a network entity, a first control signaling configuring at least one CSI report configuration for CSI report with CSI prediction based on the CSI-RS resource; and

receive the CSI-RS on the CSI-RS resource.
The method of claim 5, wherein the CSI report with the CSI prediction is configured based on Type1 codebook, Type2 codebook, or eType2 codebook.
The method of any of claims 5-6, further comprising:

receiving, from the network entity, a second control signaling triggering at least one of: the at least one CSI report with CSI prediction, or the CSI-RS resource for the CSI prediction.
The method of any of the claims 2-7, wherein the sending, to the network entity, the at least one CSI report with CSI prediction for the one or more future time slots comprises:

transmitting, to the network entity, the at least one CSI report including a full set of CSI parameters for all of the one or more future time slots.
The method of any of the claims 2-7, wherein the sending, to the network entity, the at least one CSI report with CSI prediction for the one or more future time slots comprises:

transmitting, to the network entity, the at least one CSI report including all of CSI parameters for a first time slot of the one or more future time slots and a part of CSI parameters for other of the one or more future time slots.
The method of any of the claims 2-7, wherein the sending, to the network entity, the at least one CSI report with CSI prediction for the one or more future time slots comprises:

transmitting, to the network entity, the at least one CSI report including one or more common CSI parameters for all of the one or more future time slots and one or more differential CSI parameters for each of the one or more future time slots.
The method of any of the claims 2-10, wherein the sending, to the network entity, the at least one CSI report with CSI prediction for the one or more future time slots comprises:

transmitting, to the network entity, the at least one CSI report including at least one of: a slot offset between a first CSI prediction slot and a CSI report slot, a slot offset between each CSI prediction slots, or a number of CSI prediction slots in the at least one CSI report.
The method of any of the claims 2-11, further comprising:

determining an order of priority for one or more precoder matrix indicators (PMIs) in the at least one CSI report based on at least one of: whether a PMI is for wideband or subband, a subband index for the PMI; or a predicted slot index for the PMI.
The method of claim 12, wherein the sending, to the network entity, the at least one CSI report with the CSI prediction for the one or more future time slots comprises:

transmitting, to the network entity, the one or more PMIs based on the order of priority.
A method of wireless communication at a network entity, comprising:

configuring at least one CSI report configuration for CSI report with CSI prediction based on a CSI-RS resource;

receiving, from a user equipment (UE) , the at least one CSI report with CSI prediction for one or more future time slots.
The method of claim 14, wherein the at least one CSI report with the CSI prediction is configured based on Type1 codebook, Type2 codebook, or eType2 codebook.
The method of any of claims 14-15, further comprising:

skipping triggering a subsequent CSI report or CSI-RS based on the CSI prediction in the at least one CSI report.
An apparatus for wireless communication comprising a transceiver, a memory, and a processor coupled to the memory and the transceiver, the apparatus being configured to implement a method as in any of claims 1-16.