Method executed by user equipment, and user equipment

Abstract

Provided in the present invention are a method executed by a user equipment, and a user equipment. The method comprises the following steps: updating or generating a channel state indication information (CSI) report; measuring the reference signal received power (RSRP) of all channel state information reference signals (CSI-RSs) in a CSI-RS resource set or all synchronization signal blocks (SSBs) in an SSB resource set; and determining content and a mapping sequence included in the CSI report.

Description

Method performed by user equipment and user equipment TECHNICAL FIELD

[0001] The present application relates to the technical field of wireless communication, and in particular to a method performed by user equipment and a corresponding user equipment. BACKGROUND

[0002] In Rel-15 NR, user equipment can perform different downlink channel measurements and Channel State Indicator (CSI) reports based on the configuration information from the network. The configuration of the measurements and the corresponding reporting mode are done by reporting configuration, which is represented by RRC parameter CSI-ReportConfig in 3GPP protocol. Specifically, the reporting configuration includes the following three aspects of information:

[0003] 1) The number of measurement reports, i.e. how many measurement items need to be reported to the network.

[0004] One measurement report needs to explicitly configure which measurement items the user equipment needs to report. For example, one measurement report can include three items: Channel Quality Indicator (CQI), Rank Indicator (RI) and Precoder Matrix Indicator (PMI), collectively referred to as Channel State Information. The measurement report can also include only one item, such as reporting the received signal strength, referred to as Reference Signal Received Power (RSRP). RSRP is also a key measurement, which is generally used in high-level Radio Resource Management (RRM). RSRP reporting is introduced in the physical layer in NR, which is used for Beam Management (BM), referred to as L1-RSRP.

[0005] 2) Measurement object, i.e. the physical resource of the downlink measurement

[0006] In the configuration information of RRC parameter CSI-ReportConfig, the reporting configuration is associated with one or more resource sets. Specifically, one measurement resource configuration is associated with one or more non-zero power channel state information reference signal (NZP-CSI RS) resource sets, and the user equipment uses the NZP-CSI RS resource set to measure the characteristics of the downlink channel. The NZP-CSI RS resource set can include a group of configured CSI-RS or a group of synchronization signal blocks (SSB). For example, the L1-RSRP measurement reporting for beam management is performed for a group of SSBs or a group of NZP-CSI RSs.

[0007] 3) Reporting mode, i.e., using which uplink physical channel to carry the CSI reporting

[0008] In Rel-15 NR, the CSI reporting of the user equipment can be divided into three types: periodic CSI reporting, semi-persistent CSI reporting, and aperiodic CSI reporting.

[0009] For periodic CSI reporting, the network needs to configure a certain reporting period. The periodic CSI reporting is carried through the physical uplink control channel (PUCCH). Therefore, for periodic CSI reporting, the resource configuration information needs to configure the periodic PUCCH resource used for reporting.

[0010] For semi-persistent CSI reporting, the network activates or deactivates the corresponding CSI reporting through the MAC CE. The semi-persistent CSI reporting can be carried through the allocated PUCCH or the allocated physical uplink shared channel (PUSCH). The PUSCH is often used to carry the semi-persistent CSI reporting with a large amount of reporting information.

[0011] The aperiodic CSI reporting is triggered by the downlink control information (DCI). Specifically, it is indicated through the CSI request indication field in the uplink scheduling grant permission. The indication field contains at most 6 bits, and each combination corresponds to a configured aperiodic CSI reporting, i.e., at most 63 different aperiodic CSI reports can be triggered (all bits set to 0 means that the aperiodic CSI reporting is not triggered). The aperiodic CSI reporting is carried through the PUSCH.

[0012] At the 3GPP RAN#94e plenary meeting on December 3, 2021, the study on Artificial Intelligence / Machine Learning (AI / ML) applications in NR air interface was approved (see Non-Patent Literature 1). The use cases of this study topic mainly include the following three aspects:

[0013] 1) Enhancement of CSI reporting, such as overhead reduction, improvement of accuracy and prediction of CSI reporting, etc.

[0014] 2) Enhancement of beam management, such as beam prediction in time domain, reduction of overhead and latency in spatial domain, and improvement of accuracy of beam selection, etc. UE reports layer 1 reference signal received power RSRP to base station, and base station performs beam management according to the reported information.

[0015] 3) Enhancement of positioning accuracy in different scenarios, such as scenarios with dense non-line of sight (NLOS) etc.

[0016] The scheme of the present patent is to determine the mapping order of CSI-RS resource identification (CRI), SSB resource identification (SSBRI) and layer 1 (L1, physical layer) reference signal received power RSRP for beam management in a CSI report when AI / ML is applied in NR air interface.

[0017] Prior art documents

[0018] Non-patent literature

[0019] Non-patent literature 1: RP-213599, New SI: Study on AI / ML for NR air interface, section 4.1 SUMMARY

[0020] In order to solve at least part of the above problems, the present application provides a method executed by a user equipment and a user equipment, which can ensure that the base station can identify the time instance corresponding to each reported CRI / SSBRI / L1-RSRP, effectively reducing the overhead of beam management report and improving the reliability of downlink transmission.

[0021] According to the application, a method performed by a user equipment is proposed, comprising the following steps: updating or generating a channel state indication information (CSI) report; performing reference signal received power (RSRP) measurement on all channel state information reference signal (CSI-RS) resources in a CSI-RS resource set or all synchronization signal blocks (SSBs) in a SSB resource set; and determining the content and mapping order contained in the CSI report.

[0022] Preferably, the CSI report associated CSI reporting configuration information contains artificial intelligence / machine learning (AI / ML) related configuration information.

[0023] Preferably, the CSI report associated CSI reporting configuration information contains reference signal configuration information for beam management reporting in addition to the reference signal for channel measurement. The reference signal for channel measurement is the CSI-RS resource set or the SSB resource set.

[0024] Preferably, the CSI report associated CSI reporting configuration contains the number N of information time instances.

[0025] Preferably, the CSI report associated CSI reporting configuration contains the number K of downlink beams corresponding to each time instance.

[0026] Preferably, the user equipment determines the predicted L1-RSRP in the CSI report according to at least the measurement value of L1-RSRP.

[0027] Preferably, the content contained in the CSI report is at least:

[0028] ■The CSI-RS resource identifier (CRI) or SSB resource identifier (SSBRI), a total of N*K, marked as CRI / SSBRI#1, #2, …, #K, #(K+1), …, #2*K, …, N*K.

[0029] ■The L1-RSRP value corresponding to the CRI or SSBRI, a total of N*K, marked as L1-RSRP#1, #2, …, #K, #(K+1), …, #2*K, …, N*K.

[0030] ■The indication information of the time instance corresponding to the L1-RSRP#1. The indication information of the time instance indicates the time instance #T, where 1≤T≤N.

[0031] Preferably, the mapping order of the CSI report is:

[0032] ■In ascending order of serial number: CRI / SSBRI#1 to CRI / SSBRI#(N*K).

[0033] ■in ascending order of sequence: L1-RSRP#1 to L1-RSRP#(N*K).

[0034] ■indication information of the time instance.

[0035] Preferably, the time instances corresponding to the CRI / SSBRI#2 to CRI / SSBRI#(N*K) in sequence are: the N time instances corresponding to the CRI / SSBRI#2 to CRI / SSBRI#(N*K) respectively, in the order of time from front to back.

[0036] In addition, according to the present application, a user equipment is provided, comprising: a processor; and a memory storing instructions, wherein the instructions, when executed by the processor, perform the above-mentioned method.

[0037] Inventive Effects

[0038] In the related technology of applying artificial intelligence / machine learning (AI / ML) in the NR air interface, for the case of model inference on the user equipment side, when the beam management report is used for temporal DL Tx beam prediction, the present application provides the mapping order of CSI-RS resource identification, SSB resource identification and layer 1 RSRP (L1-RSRP) in the beam management report. Specifically, except for the time instance corresponding to the maximum L1-RSRP prediction value, the other CRI, SSBRI and L1-RSRP in the beam management report are mapped according to the time instance from the first to the last. The present application ensures that the base station can identify the time instance corresponding to each reported CRI, SSBRI and L1-RSRP, effectively reduces the overhead of the beam management report, and improves the reliability of the downlink transmission. BRIEF DESCRIPTION OF DRAWINGS

[0039] The above and other features of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which:

[0040] FIG. 1 is a schematic diagram showing the basic process of the method performed by the user equipment in the first embodiment of the present application.

[0041] FIG. 2 is a block diagram of a user equipment according to an embodiment of the present application. DETAILED DESCRIPTION

[0042] The present application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the present application should not be limited to the specific embodiments described below. In addition, for the sake of simplicity, detailed descriptions of well-known technology that is not directly related to the present application are omitted to prevent obscuring the understanding of the present application.

[0043] The following describes in detail a plurality of embodiments according to the present application with reference to the 5G mobile communication system and its subsequent evolved versions as an example application environment. However, it should be noted that the present application is not limited to the following embodiments, but can be applied to more other wireless communication systems, such as the communication systems after 5G and the 4G mobile communication system before 5G, etc.

[0044] The following describes some terms related to the present application. If not specifically described, the terms related to the present application are defined herein. The terms given in the present application can be given different names in LTE, LTE-Advanced, LTE-Advanced Pro, NR, and subsequent communication systems, but uniform terms are used in the present application, and when applied to a specific system, the terms used in the corresponding system can be replaced.

[0045] 3GPP: 3rd Generation Partnership Project, 3rd Generation Partnership Project

[0046] LTE: Long Term Evolution, Long Term Evolution technology

[0047] NR: New Radio, New Radio, New Radio

[0048] PDCCH: Physical Downlink Control Channel, Physical Downlink Control Channel

[0049] DCI: Downlink Control Information, Downlink Control Information

[0050] PDSCH: Physical Downlink Shared Channel, Physical Downlink Shared Channel

[0051] UE: User Equipment, User Equipment

[0052] eNB: evolved NodeB, evolved NodeB

[0053] gNB: NR base station

[0054] TTI: Transmission Time Interval, Transmission Time Interval

[0055] OFDM: Orthogonal Frequency Division Multiplexing

[0056] CP-OFDM: Cyclic Prefix Orthogonal Frequency Division Multiplexing

[0057] C-RNTI: Cell Radio Network Temporary Identifier

[0058] CSI: Channel State Information

[0059] HARQ: Hybrid Automatic Repeat Request

[0060] CSI-RS: Channel State Information Reference Signal

[0061] CRS: Cell Reference Signal

[0062] PUCCH: Physical Uplink Control Channel

[0063] PUSCH: Physical Uplink Shared Channel

[0064] UL-SCH: Uplink Shared Channel

[0065] CG: Configured Grant

[0066] MCS: Modulation and Coding Scheme

[0067] RB: Resource Block

[0068] RE: Resource Element

[0069] CRB: Common Resource Block, common resource block

[0070] CP: Cyclic Prefix, cyclic prefix

[0071] PRB: Physical Resource Block, physical resource block

[0072] FDM: Frequency Division Multiplexing, frequency division multiplexing

[0073] RRC: Radio Resource Control, radio resource control

[0074] RSRP: Reference Signal Receiving Power, reference signal receiving power

[0075] SRS: Sounding Reference Signal, sounding reference signal

[0076] DMRS: Demodulation Reference Signal, demodulation reference signal

[0077] CRC: Cyclic Redundancy Check, cyclic redundancy check

[0078] SFI: Slot Format Indication, slot format indication

[0079] TDD: Time Division Duplexing, time division duplexing

[0080] FDD: Frequency Division Duplexing, frequency division duplexing

[0081] SIB: System Information Block, system information block

[0082] SIB1: System Information Block Type 1, system information block type 1

[0083] PCI: Physical Cell ID, physical cell id

[0084] PSS: Primary Synchronization Signal, primary synchronization signal

[0085] SSS: Secondary Synchronization Signal

[0086] BWP: BandWidth Part

[0087] SFN: System Frame Number

[0088] IE: Information Element

[0089] SSB: Synchronization Signal Block

[0090] EN-DC: EUTRA-NR Dual Connection

[0091] MCG: Master Cell Group

[0092] SCG: Secondary Cell Group

[0093] PCell: Primary Cell

[0094] SCell: Secondary Cell

[0095] SPS: Semi-Persistant Scheduling

[0096] TA: Timing Advance

[0097] PT-RS: Phase-Tracking Reference Signals

[0098] TB: Transport Block

[0099] CB: Code Block

[0100] QPSK: Quadrature Phase Shift Keying

[0101] 16 / 64 / 256QAM: 16 / 64 / 256 Quadrature Amplitude Modulation

[0102] TDRA (field): Time Domain Resource Assignment, time domain resource allocation indication (field)

[0103] FDRA (field): Frequency Domain Resource Assignment, frequency domain resource allocation indication (field)

[0104] ARFCN: Absolute Radio Frequency Channel Number, absolute radio frequency channel number

[0105] SC-FDMA: Single Carrier-Frequency Division Multiple Access, single carrier-frequency division multiple access

[0106] MAC: Medium Access Control, medium access control layer

[0107] PDU: Protocol Data Unit, protocol data unit

[0108] TBS: Transport Block Size, transport block size

[0109] CQI: Channel Quality Indicator, channel quality indicator

[0110] RI: Rank Indicator, channel rank indication

[0111] PMI: Precoder Matrix Indicator, channel precoding matrix indication

[0112] RRM: Radio Resource Management, radio resource management

[0113] BM: Beam Management, beam management

[0114] NZP-CSI RS: Non Zero Power CSI Reference Signal, non-zero power channel state information reference signal

[0115] MAC CE: Medium Access Control Control Element, medium access control control element

[0116] CRI: CSI-RS Resource Indicator, CSI-RS resource indicator

[0117] SSBRI: SSB Resource Indicator, SSB resource indicator

[0118] MSB: Most Significant Bit, highest bit

[0119] LSB: Least Significant Bit, lowest bit

[0120] The following is a description of the prior art associated with the present application. Unless otherwise specified, the meaning of the same terms in the specific embodiments is the same as in the prior art.

[0121] In the specification herein, the network represents the same meaning as the base station.

[0122] In the specification herein, the use of artificial intelligence / machine learning (AI / ML) models can also be referred to as the use of enhanced CSI (or reporting).

[0123] Numerology in NR and slot in NR

[0124] The numerology includes two aspects of subcarrier spacing and cyclic prefix (CP) length. Among them, NR supports five subcarrier spacings, which are 15k, 30k, 60k, 120k, and 240kHz (corresponding to μ=0, 1, 2, 3, 4). Table 4.2-1 shows the supported transmission numerology, as follows.

[0125] Table 4.2-1 NR supported subcarrier spacing

[0126] Extended CP is only supported when μ=2, i.e. 60kHz subcarrier spacing, and normal CP is only supported for other subcarrier spacings. For normal (Normal) CP, each slot contains 14 OFDM symbols; for extended CP, each slot contains 12 OFDM symbols. For μ=0, i.e. 15kHz subcarrier spacing, 1 slot = 1ms; for μ=1, i.e. 30kHz subcarrier spacing, 1 slot = 0.5ms; for μ=2, i.e. 60kHz subcarrier spacing, 1 slot = 0.25ms, and so on.

[0127] NR and LTE have the same definition of subframe, which represents 1ms. For subcarrier spacing configuration μ, the slot number within 1 subframe (1ms) can be represented as The range is 0 to The slot number within 1 system frame (10 ms in duration) can be denoted by The range is 0 to Where, And The definitions in case of different subcarrier spacing μ are shown in the following table.

[0128] Table 4.3.2-1: Number of symbols per slot, number of slots per system frame, number of slots per subframe for normal CP

[0129] Table 4.3.2-2: Number of symbols per slot, number of slots per system frame, number of slots per subframe for extended CP (60 kHz)

[0130] On an NR carrier, the number of system frame (or, simply, frame) SFN ranges from 0 to 1023.

[0131] Resource Block RB and Resource Element RE

[0132] A resource block RB is defined in the frequency domain as contiguous subcarriers, e.g. for a subcarrier spacing of 15 kHz, a RB is 180 kHz in the frequency domain. For a subcarrier spacing of 15 kHz x 2 μ , a resource element RE represents 1 subcarrier in the frequency domain and 1 OFDM symbol in the time domain.

[0133] NR Common Resource Block (CRB)

[0134] A common resource block CRB is defined for a numerology. For all numerologies, the center frequency of subcarrier 0 of common resource block CRB number 0 points to the same location in the frequency domain, which is referred to as “point A”.

[0135] NR Resource Grid

[0136] For each numerology, a resource grid is defined in a given transmission direction (denoted by x, where x = DL for downlink and x = UL for uplink) of one carrier, which contains subcarriers (i.e. resource blocks RB, each containing one subcarrier, contains denotes the number of OFDM symbols within one subframe, which is numerology dependent denotes the number of subcarriers within one resource block (RB), which satisfies the lowest numbered common resource block (CRB) of the resource grid configured by the higher layer parameter offsetToCarrier, the number of resource blocks in frequency domain configured by the higher layer parameter carrierBandwidth. For a given numerology and higher layer parameter offsetToCarrier, the gNB configures the common (across cells) offsetToCarrier in ServingCellConfigCommon IE through dedicated signaling. Specifically, ServingCellConfigCommon includes the higher layer parameter downlinkConfigCommon, which contains the configuration information of offsetToCarrier.

[0137] bandwidth part (BWP)

[0138] In NR, for each numerology, one or multiple BWPs can be defined. Each BWP contains one or multiple contiguous CRBs. Assuming the index of a BWP is i, its starting (or, equivalently, by ) and length (or, equivalently, by ) must satisfy the following relationship:

[0139] i.e., the CRBs contained in this BWP must be located within the resource grid corresponding to the numerology. The distance from the lowest numbered CRB of a BWP to point A, in units of RBs, is denoted by

[0140] The resource blocks within a BWP are referred to as physical resource blocks (PRBs), whose indices are where the physical resource block 0 corresponds to the lowest numbered CRB of the BWP, i.e., CRB ​For a given serving cell, the gNB configures a BWP using the following high-level parameters:

[0141] 1) Subcarrier spacing;

[0142] 2) CP length;

[0143] 3) The high-level parameter locationAndBandwidth indicates the BWP relative to the starting CRB of the resource raster. offset value offset(RB) start ) and the number L of consecutive CRBs in the frequency domain of the BWP RB ,satisfy Among them O carrier This represents `offsetToCarrier`; where the parameter `locationAndBandwidth` indicates a `RIV` (Resource Indication Value). The `RIV` is related to `L`. RB and RB start The calculation relationship is as follows: If So otherwise, in, and,

[0144] 4) The serial number of the BWP;

[0145] 5) Configuration of BWP common and BWP proprietary parameters, such as the configuration of PDCCH and PDSCH for downlink BWP.

[0146] Channel State Information (CSI) Reporting in NR

[0147] In NR, user equipment can perform different downlink channel measurements and channel state information reports (CSI reports) based on network configuration information. The measurement configuration and the corresponding reporting method are accomplished through the reporting configuration, which is represented by the RRC parameter CSI-ReportConfig in the 3GPP protocol.

[0148] CSI Report Items

[0149] One measurement report needs to explicitly configure which measurement items the user equipment needs to report. For example, one measurement report can include three items: Channel Quality Indicator (CQI), Rank Indicator (RI), and Precoder Matrix Indicator (PMI), collectively known as Channel State Information. A measurement report can also include only one item, for example, reporting the received signal strength, known as Reference Signal Received Power (RSRP). RSRP is also a key measurement, generally used in high-level Radio Resource Management (RRM). In NR, RSRP reporting is introduced in the physical layer for Beam Management (BM), known as L1-RSRP. For L1-RSRP reporting, the user equipment can report the largest L1-RSRP measurement value, and the rest of the L1-RSRP is reported in a differential manner, i.e., the rest of the reported L1-RSRP values are the difference between the measurement value and the largest L1-RSRP measurement value.

[0150] Physical measurement resource for CSI reporting

[0151] In the configuration information of RRC parameter CSI-ReportConfig, the reporting configuration is associated with one or more resource sets. Specifically, one measurement resource configuration is associated with one or more Non Zero Power CSI Reference Signal (NZP-CSI RS) resource sets, which are used by the user equipment to measure the characteristics of the downlink channel. The NZP-CSI RS resource set can include a set of configured CSI-RS or a set of Synchronization Signal Blocks (SSBs). For example, the L1-RSRP measurement reporting for beam management is performed for a set of SSBs or a set of NZP-CSI RSs. For a set of configured NZP-CSI RS resources, a CSI-RS resource index (CRI) is used to represent a specific CSI-RS resource in the set. For example, if the set contains 4 CSI-RS resources, the CRI is 2 bits, ‘00’ represents the first CSI-RS resource, ‘01’ represents the second CSI-RS resource, ‘10’ represents the third CSI-RS resource, and ‘111 represents the fourth CSI-RS resource. Similarly, for a set of configured SSB resources, a Synchronization Signal Block Resource Index (SSBRI) is used to represent a specific SSB resource in the set.

[0152] Reporting mode of CSI reporting

[0153] In NR, the CSI reporting of the user equipment can be divided into three types: periodic CSI reporting, semi-persistent CSI reporting, and aperiodic CSI reporting.

[0154] For periodic CSI reporting, the network needs to configure a certain reporting period. Periodic CSI reporting is carried through the Physical Uplink Control Channel (PUCCH). Therefore, for periodic CSI reporting, the resource configuration information needs to configure the periodic PUCCH resource used for reporting.

[0155] For semi-persistent CSI reporting, the network activates or deactivates the corresponding CSI reporting through the MAC CE. Semi-persistent CSI reporting can be carried through the allocated PUCCH or through the allocated Physical Uplink Shared Channel (PUSCH). The PUCCH resource is semi-statically configured periodically. The PUSCH is often used to carry semi-persistent CSI reporting with a large amount of reporting information.

[0156] Aperiodic CSI reporting is triggered by downlink control information (DCI). Specifically, it is indicated by the CSI request field in the uplink scheduling grant. This field contains up to 6 bits, and each combination corresponds to a configured aperiodic CSI reporting, i.e., up to 63 different aperiodic CSI reporting can be triggered (all bits set to 0 means no aperiodic CSI reporting). Aperiodic CSI reporting is carried by PUSCH.

[0157] Quantization of L1-RSRP

[0158] L1-RSRP represents the received power of the reference signal, ranging from [-140, -44] dBm, which can be quantized by 7 bits (7-bit reporting values are [0, 127]), and the corresponding relationship is shown in the following table.

[0159] For all L1-RSRP in a L1-RSRP set except the largest L1-RSRP, 4 bits can be used for differential quantization (4-bit reporting values are [0, 15]), which means subtracting other L1-RSRP from the largest L1-RSRP, and quantizing the negative result, and the corresponding relationship is shown in the following table.

[0160] Artificial intelligence / machine learning (AI / ML)

[0161] In the present disclosure, AI / ML model is used to represent the application of AI / ML technology in NR air interface. In the case of CSI enhancement, the AI / ML model includes a CSI generation model (or referred to as encoder or auto-encoder) and a CSI reconstruction model (or referred to as decoder or auto-decoder). In the case of beam management enhancement, when the UE applies the AI / ML model, it can be used to generate the reported beam measurement information. For example, when the input of the model is the layer 1-RSRP (L1-RSRP) measured on a CSI-RS, the output of the model can be the L1-RSRP of a CSI-RS (corresponding to a downlink beam) that has not been measured (actually), which is referred to as the predicted L1-RSRP in the present disclosure. When the network applies the AI / ML model, two sets of reference signals can be configured for the UE. The two sets can be different, one of which is used for beam measurement, and the other set represents the beams that need to be reported.

[0162] The AI / ML technology can be divided into the following 5 aspects:

[0163] 1) AI / ML model training

[0164] AI / ML model training means obtaining an inference relationship (e.g., a function) from the combination of input parameters and output parameters for subsequent inference. Taking the CSI generation model as an example, the model can be trained by the network or by the UE. The input parameters of the model are the original data of the channel (e.g., the original matrix of the channel), and the output parameters are the CSI reported to the network. Conversely, for the CSI reconstruction model, it can also be trained by the network or by the UE. The input parameters of the CSI reconstruction model are the reported CSI, and the output parameters are the original data of the channel.

[0165] 2) AI / ML model transfer

[0166] If the CSI generation model is trained by the network, the trained CSI generation model can be sent by the network to the UE for model inference of the UE. The sending of the model is referred to as the transfer of the AI / ML model.

[0167] 3) AI / ML model inference

[0168] For example, the process that the UE uses a CSI generation model to generate CSI report is the inference process of the AI / ML model. Similarly, the process that the network uses a CSI reconstruction model to generate the original channel data is also the inference of the AI / ML model.

[0169] 4) Model monitoring of AI / ML model

[0170] The network or the UE needs to monitor the AI / ML model used to determine whether the model used is suitable for the current channel state.

[0171] 5) Model update of AI / ML model

[0172] When the network or the UE considers that the model is no longer applicable, the AI / ML model will be updated.

[0173] Time instance in beam management report

[0174] In a beam management report, it can contain CSI-RS resource identification (CRI), SSB resource identification and L1-RSRP. Unlike traditional beam management reports, when the related technology of applying artificial intelligence / machine learning (AI / ML) in NR air interface is applied, for the model inference on the UE side, the beam management report can contain one or more (denoted by N) CRI / SSBRI corresponding to the future time, and / or L1-RSRP. The above future time is also called time instance. The number N of time instances can be configured by RRC parameters. Specifically, one time instance corresponds to one or more CRI / SSBRI and the corresponding predicted L1-RSRP.

[0175] Hereinafter, specific examples and embodiments related to the present application will be described in detail. In addition, as described above, the examples and embodiments described in the present disclosure are exemplary descriptions for easy understanding of the present application, and are not limitations of the present application.

[0176] [Embodiment One]

[0177] FIG. 1 is a schematic diagram showing the basic process of the method performed by the user equipment according to Embodiment One of the present application.

[0178] Hereinafter, the method performed by the user equipment according to Embodiment One of the present application will be described in detail in combination with the basic process diagram shown in FIG. 1.

[0179] As shown in FIG. 1, in Embodiment One of the present application, the steps performed by the user equipment include:

[0180] At step S101, the user equipment updates (or, generates) a channel state indication information, CSI, report.

[0181] Optionally, the CSI report associated CSI reporting configuration information, CSI-ReportConfig, includes but is not limited to the following configuration information:

[0182] ■AI / ML related configuration information (or, the CSI reporting configuration information applies an AI / ML model).

[0183] Or,

[0184] ■On the basis of the configured channel measurement reference signal, it also contains reference signal configuration information for beam management reporting.

[0185] ●Among them, optionally, the reference signal for channel measurement is a channel state information reference signal, CSI-RS, resource set, or a synchronization signal block, SSB, resource set.

[0186] And / or,

[0187] ■The number of time instances, N.

[0188] And / or,

[0189] ■The number of (reported) downlink beams (CSI-RS resource identifier, CRI, or SSB resource identifier, SSBRI) corresponding to each time instance. The K can also be dynamically indicated by the base station through DCI, or a predefined positive integer.

[0190] At step S102, the user equipment performs L1-RSRP measurement on all CSI-RSs in the CSI-RS resource set or all SSBs in the SSB resource set.

[0191] Among them, optionally, the user equipment determines the predicted L1-RSRP in the CSI report at least according to the L1-RSRP measurement value.

[0192] At step S103, the user equipment determines the content and mapping order of the CSI report.

[0193] Among them, the CSI report at least contains:

[0194] ■The CSI-RS resource identification CRI or SSB resource identification SSBRI. Optionally, the number of the CRI or SSBRI is N*K (i.e., contains the N time instances in total, each time instance corresponding to the K CRI / SSBRI), marked as CRI / SSBRI#1, #2, …, #K, #(K+1), …, #2*K, …, N*K.

[0195] and / or,

[0196] ■The (all)(predicted) L1-RSRP values corresponding to the CRI or SSBRI (i.e., optionally, contains N*K L1-RSRP values in total, marked as L1-RSRP#1, #2, …, #K, #(K+1), …, #2*K, …, N*K).

[0197] • Wherein, L1-RSRP#1 corresponds to the maximum value in the (all)(predicted) L1-RSRP values. Other L1-RSRP values except L1-RSRP#1 are differential RSRP values.

[0198] • Wherein, the (predicted) L1-RSRP value corresponding to each CRI / SSBRI#X (1≤X≤N*K) is L1-RSRP#X.

[0199] and,

[0200] ■The indication information of the time instance corresponding to L1-RSRP#1. Optionally, the indication information of the time instance contains bits, or, bits. Wherein, represents the ceiling operation on X.

[0201] • The time instance indication information indicates that the time instance corresponding to CRI / SSBRI#1 (L1-RSRP#1) is #T, where 1≤T≤N.

[0202] Optionally, the mapping order of the CSI report is (from front to back, or from left to right, or from the most significant bit MSB to the least significant bit LSB, or from the least significant bit LSB to the most significant bit MSB):

[0203] ■In the ascending order of the serial number: CRI / SSBRI#1 to CRI / SSBRI#(N*K).

[0204] ■In the ascending order of the serial number: L1-RSRP#1 to L1-RSRP#(N*K).

[0205] ■indication information of the time instance.

[0206] or,

[0207] ■CRI / SSBRI#1.

[0208] ■indication information of the time instance.

[0209] ■in ascending order of sequence number: CRI / SSBRI#2 to CRI / SSBRI#(N*K).

[0210] ■in ascending order of sequence number: L1-RSRP#1 to L1-RSRP#(N*K).

[0211] or,

[0212] ■in ascending order of sequence number: CRI / SSBRI#1 to CRI / SSBRI#(N*K).

[0213] ■indication information of the time instance.

[0214] ■in ascending order of sequence number: L1-RSRP#1 to L1-RSRP#(N*K).

[0215] or,

[0216] ■in ascending order of sequence number: CRI / SSBRI#1 to CRI / SSBRI#(N*K).

[0217] ■L1-RSRP#1.

[0218] ■indication information of the time instance.

[0219] ■in ascending order of sequence number: L1-RSRP#2 to L1-RSRP#(N*K).

[0220] or,

[0221] ■indication information of the time instance.

[0222] ■in ascending order of sequence number: CRI / SSBRI#1 to CRI / SSBRI#(N*K).

[0223] ■in ascending order of sequence number: L1-RSRP#1 to L1-RSRP#(N*K).

[0224] Optionally, the time instances corresponding to CRI / SSBRI#2 to CRI / SSBRI#(N*K) in turn are:

[0225] ■CRI / SSBRI#2 to CRI / SSBRI#K correspond to time instance #T, CRI / SSBRI#(K+1) to CRI / SSBRI#(N*K) correspond to the remaining (N-1) time instances of the N time instances except for the time instance #T, in time from early (first) to late, or, from morning to evening.

[0226] ■CRI / SSBRI#2 to CRI / SSBRI#K correspond to time instance #T, CRI / SSBRI#(K+1) to CRI / SSBRI#(N*K) correspond to the remaining (N-1) time instances of the N time instances except for the time instance #T, in time from early (first) to late, or, from morning to evening.

[0227] ■CRI / SSBRI#2 to CRI / SSBRI#K correspond to time instance #T, CRI / SSBRI#(K+1) to CRI / SSBRI#(N*K) correspond to the remaining (N-1) time instances of the N time instances except for the time instance #T, in time from early (first) to late, or, from morning to evening.

[0228] ■CRI / SSBRI#2 to CRI / SSBRI#K correspond to time instance #T, CRI / SSBRI#(K+1) to CRI / SSBRI#(N*K) correspond to the remaining (N-1) time instances of the N time instances except for the time instance #T, in time from early (first) to late, or, from morning to evening.

[0229] ■CRI / SSBRI#2 to CRI / SSBRI#K correspond to time instance #T, CRI / SSBRI#(K+1) to CRI / SSBRI#(N*K) correspond to the remaining (N-1) time instances of the N time instances except for the time instance #T, in time from early (first) to late, or, from morning to evening.

[0230] ■CRI / SSBRI#2 to CRI / SSBRI#K correspond to time instance #T, CRI / SSBRI#(K+1) to CRI / SSBRI#(N*K) correspond to the remaining (N-1) time instances of the N time instances except for the time instance #T, in time from early (first) to late, or, from morning to evening.

[0231] Figure 2 is a block diagram showing a user equipment UE according to the present application. As shown in Figure 2, the user equipment UE 20 includes a processor 201 and a memory 202. The processor 201 can include, for example, a microprocessor, a microcontroller, an embedded processor, etc. The memory 202 can include, for example, a volatile memory (such as a random access memory RAM), a hard disk drive (HDD), a non-volatile memory (such as a flash memory), or other storage media, etc. The memory 202 stores program instructions. The instructions, when executed by the processor 201, can perform the above-mentioned method executed by the user equipment according to the detailed description of the present application.

[0232] The above-described method and the apparatus according to the present application have been described in connection with preferred embodiments. It will be understood by those skilled in the art that the above-described method is merely exemplary and the above-described embodiments can be combined with each other without contradiction. The method according to the present application is not limited to the above-described steps and order. The above-described network node and user equipment can include more modules, for example, modules that can be developed or will be developed in the future for a base station, an MME, or a UE, etc. The various identifiers shown above are merely exemplary and not restrictive, and the present application is not limited to the specific information elements as the examples of the identifiers. Many changes and modifications can be made by those skilled in the art according to the teachings of the embodiments shown above.

[0233] It should be understood that the above-described embodiments of the present application can be implemented by software, hardware, or a combination of software and hardware. For example, the various components inside the base station and the user equipment in the above-described embodiments can be implemented by various devices including, but not limited to, analog circuit devices, digital circuit devices, digital signal processing (DSP) circuits, programmable processors, application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), programmable logic devices (CPLDs), etc.

[0234] In the present application, the "base station" can refer to a mobile communication data and control switching center with a large transmission power and a wide coverage area, including functions such as resource allocation scheduling, data reception and transmission, etc. The "user equipment" can refer to a user mobile terminal, for example, a terminal device that can communicate wirelessly with a base station or a micro base station, including a mobile phone, a notebook, etc.

[0235] Furthermore, the embodiments of the present invention disclosed herein can be implemented on a computer program product. More specifically, the computer program product is one that has a computer-readable medium on which computer program logic is encoded, which, when executed on a computing device, provides related operations to implement the above-described technical solutions of the present invention. When executed on at least one processor of a computing system, the computer program logic causes the processor to perform the operations (methods) described in the embodiments of the present invention. This configuration of the present invention is typically provided as software, code, and / or other data structures disposed or encoded on a computer-readable medium such as an optical medium (e.g., CD-ROM), floppy disk, or hard disk, or other media such as firmware or microcode on one or more ROM, RAM, or PROM chips, or downloadable software images, shared databases, etc., in one or more modules. The software or firmware or such configuration can be installed on a computing device to cause one or more processors in the computing device to execute the technical solutions described in the embodiments of the present invention.

[0236] Furthermore, each functional module or feature of the base station equipment and terminal equipment used in each of the above embodiments can be implemented or executed by circuitry, which is typically one or more integrated circuits. Circuitry designed to perform the various functions described in this specification may include general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs) or general-purpose integrated circuits, field-programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic, or discrete hardware components, or any combination of the above devices. The general-purpose processor may be a microprocessor, or the processor may be an existing processor, controller, microcontroller, or state machine. The aforementioned general-purpose processor or each circuit may be configured by digital circuitry or by logic circuitry. Furthermore, when advancements in semiconductor technology lead to advanced technologies that can replace current integrated circuits, the present invention may also utilize integrated circuits obtained using such advanced technologies.

[0237] Although the present invention has been illustrated above with reference to preferred embodiments, those skilled in the art will understand that various modifications, substitutions, and changes can be made to the invention without departing from its spirit and scope. Therefore, the invention should not be limited by the above embodiments, but rather by the appended claims and their equivalents.

Claims

1.A method performed by a user equipment, comprising the steps of: updating or generating a channel state indication information, CSI, report; measuring reference signal received power, RSRP, of all channel state information reference signal, CSI-RS, resources in a CSI-RS resource set or all synchronization signal block, SSB, resources in a SSB resource set; and determining the content and mapping order contained in the CSI report. 2.The method of claim 1, wherein the CSI report associated CSI reporting configuration contains a number of time instances, N, the CSI report associated CSI reporting configuration contains a number of downlink beams corresponding to each time instance, K. 3.The method of claim 2, wherein the content contained in the CSI report is at least: CSI-RS resource identity, CRI, or SSB resource identity, SSBRI, in total N*K, marked as CRI / SSBRI#1, #2, …, #K, # (K+1), …, #2*K, …, N*K; time instance indication information, the time instance indication information indicates a time instance #T, wherein 1≤T≤N. 4.The method of claim 3, wherein the time instances corresponding to CRI / SSBRI#2 to CRI / SSBRI# (N*K) in turn are: the CRI / SSBRI#2 to CRI / SSBRI# (N*K) respectively correspond to the N time instances in the order of time from front to back. 5.A user equipment, comprising: a processor; and a memory storing instructions, wherein the instructions, when executed by the processor, perform the method according to any one of claims 1-4. ​

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