Method and apparatus for CSI calculation and reporting for coherent joint transmission

Abstract

The invention relates to a method and apparatus for channel state information (CSI) calculation and reporting for coherent joint transmission (CJT). An embodiment of the present disclosure provides a user equipment (UE) comprising: a transceiver; and a processor coupled with the transceiver and configured to: receive, via the transceiver, configuration information indicating a number of channel state information-reference signal (CSI-RS) resources in a set of CSI-RS resources as channel measurement resources; determining a first symbol associated with the first additional duration and a second symbol associated with the second additional duration; and transmitting, via the transceiver, the CSI report in a case where an uplink transmission carrying the CSI report is later than or at the same time as the first symbol after the end of the last symbol of a physical downlink control channel (PDCCH) triggering the CSI report; aperiodic channel measurement-interference measurement (CSI-IM) for interference measurement and aperiodic non-zero power (NZP) for interference measurement in uplink transmission carrying the CSI report later than aperiodic CSI-RS resources for channel measurement and transmitting the CSI report in the second symbol after the end of the last symbol of the CSI-RS or under the condition that the last symbol and the second symbol are at the same time.

Description

Technical Field

[0001] The present disclosure relates to wireless communications, and in particular, to methods and apparatus for channel state information (CSI) calculation and reporting for coherent joint transmission (CJT). Background Art

[0002] The continued evolution of Multiple Input Multiple Output (MIMO) is perhaps the most important part of the 3rd Generation Partnership Project (3GPP) physical layer. It is important to identify and specify the necessary enhancements for both downlink and uplink MIMO to facilitate the use of large antenna arrays not only for Frequency Range 1 (FR1) but also for FR2 to meet the requirements of the evolution of New Radio (NR) deployments in 3GPP Release 18.

[0003] As CJT leverages high-performance backhaul and synchronization to improve coverage and average throughput in commercial deployments, enhancements to channel state information (CSI) acquisition for frequency division duplex (FDD) and time division duplex (TDD) for FR1 can be beneficial in extending the utility of multiple transmit or receive point (TRP) deployments.

[0004] As the number of CSI-RS resources used for CJT, TRP selection, and beam number combination selection increases, processing complexity and, accordingly, CSI calculation time can increase significantly. Therefore, it is advantageous to provide a method and apparatus for CSI reporting for CJT that takes CSI calculation time into account.

[0005] For N TRP CJT mTRP of a TRP or TRP group (where N TRP may be an integer having a value equal to or greater than 1), the channel measurement resource (CMR) may include K NZP CSI-RS resources (where K may be an integer having a value equal to or greater than 1), where one resource corresponds to one TRP or TRP group (i.e., K = N TRP ). Therefore, CJT may be implicitly indicated by configuration information indicating the number of CSI-RS resources in a channel state information-reference signal (CSI-RS) resource set as channel measurement resources in the present disclosure. Hereinafter in the present disclosure, the expression "receiving configuration information indicating the number of CSI-RS resources in a CSI-RS resource set as channel measurement resources" (or similar expressions) and the expression "CJT" may be used interchangeably in the description. Summary of the Invention

[0006] An embodiment of the present disclosure provides a user equipment (UE), comprising: a transceiver; and a processor, the processor being coupled to the transceiver and configured to: receive, via the transceiver, configuration information indicating the number of channel state information-reference signal (CSI-RS) resources in a CSI resource set as channel measurement resources; determine a first symbol associated with a first additional duration and a second symbol associated with a second additional duration; and transmit, via the transceiver, the CSI report when an uplink transmission carrying the CSI report is later than the first symbol after the end of the last symbol of a physical downlink control channel (PDCCH) triggering the CSI report or at the same time as the first symbol; and transmit the CSI report when the uplink transmission carrying the CSI report is later than the second symbol after the end of the last symbol of an aperiodic CSI-RS resource for channel measurement, an aperiodic channel measurement-interference measurement (CSI-IM) for interference measurement, and an aperiodic non-zero power (NZP) CSI-RS for interference measurement or at the same time as the second symbol.

[0007] In some embodiments, the first symbol is determined by a third symbol defined by a specification and the first additional time duration, and the second symbol is determined by a fourth symbol defined by the specification and the second additional time duration.

[0008] In some embodiments, in case the total number of CSI-RS ports per CSI-RS resource exceeds a threshold, the first additional duration or the second additional duration includes a first time period.

[0009] In some embodiments, when 3 transmission or reception points (TRPs) or 4 TRPs are configured, the value of the threshold is 8; or, when 2 TRPs are configured, the value of the threshold is 16.

[0010] In some embodiments, when the UE supports TRP selection, the first additional duration or the second additional duration includes a second time period.

[0011] In some embodiments, in the case where the UE supports selection of a beam number combination, the first additional duration or the second additional duration includes a third time period.

[0012] In some embodiments, the processor is further configured to: transmit, via the transceiver, UE capability information indicating one or more additional time durations, wherein the one or more additional time durations include a first time period, a second time period, or a third time period.

[0013] In some embodiments, the first additional duration or the second additional duration is determined according to one or more additional durations reported by the UE, predetermined by a specification, or configured by a base station (BS) based on the one or more additional durations reported by the UE.

[0014] In some embodiments, the first additional duration or the second additional duration is associated with the following minimum subcarrier spacing (SCS): the SCS of the PDCCH carrying downlink control information (DCI) that triggers the SCI report; the SCS of the uplink transmission carrying the CSI report; or the minimum SCS of the non-periodic CSI-RS triggered by the DCI.

[0015] In some embodiments, the first additional time duration or the second additional time duration includes a number of orthogonal frequency division multiplexing (OFDM) symbols.

[0016] In some embodiments, the first additional duration and the second additional duration have the same value.

[0017] In some embodiments, the first additional duration and the second additional duration may be based on different SCS scaling.

[0018] Another embodiment of the present disclosure provides a UE, comprising: a transceiver; and a processor, coupled to the transceiver and configured to: receive, via the transceiver, configuration information indicating the number of CSI-RS resources in a CSI-RS resource set and configuration information of discontinuous reception (DRX); and transmit, via the transceiver, a CSI report based on a temporal relationship between the number of CSI-RS resources in the CSI-RS resource set and a CSI reference resource, wherein at least one CSI-RS resource in the CSI-RS resource set is within a DRX activity duration.

[0019] In some embodiments, the CSI report is transmitted only if the CSI-RS transmission timing for each CSI-RS resource in the CSI-RS resource set is earlier than or co-in time with the CSI-RS reference resource in the time domain.

[0020] In some embodiments, the CSI report is transmitted when a first CSI-RS transmission timing for a first CSI-RS resource in the CSI-RS resource set is earlier than or at the same time as the CSI reference resource in the time domain, and a second CSI-RS transmission timing for a second CSI-RS resource in the CSI-RS resource set is later than the CSI reference resource in the time domain; or the CSI report is transmitted when a first CSI-RS transmission timing for a first CSI-RS resource in the CSI-RS resource set is earlier than or at the same time as the CSI reference resource in the time domain, and a second CSI-RS transmission timing for a second CSI-RS resource in the CSI-RS resource set is earlier than or at the same time as the CSI reference resource in the time domain.

[0021] In some embodiments, the CSI report is based on the first CSI-RS resource in the CSI-RS resource set.

[0022] In some embodiments, the CSI report is based on the first CSI-RS resource in the CSI-RS resource set, or based on both the first CSI-RS resource and the second CSI-RS resource in the CSI-RS resource set.

[0023] Another embodiment of the present disclosure provides a BS, comprising: a transceiver; and a processor coupled to the transceiver and configured to: transmit, via the transceiver, configuration information indicating the number of CSI-RS resources in a CSI-RS resource set serving as channel measurement resources; determine a first symbol associated with a first additional duration and a second symbol associated with a second additional duration; and receive, via the transceiver, the CSI report when the uplink transmission carrying the CSI report is later than the first symbol after the end of the last symbol of the PDCCH triggering the CSI report or is at the same time as the first symbol; and receive the CSI report when the uplink transmission carrying the CSI report is later than the second symbol after the end of the last symbol of the non-periodic CSI-RS resources for channel measurement, the non-periodic CSI-IM for interference measurement, and the non-periodic NZP CSI-RS for interference measurement or is at the same time as the second symbol.

[0024] In some embodiments, the first symbol is determined by a third symbol defined by a specification and the first additional time duration, and the second symbol is determined by a fourth symbol defined by the specification and the second additional time duration.

[0025] In some embodiments, in case the total number of CSI-RS ports per CSI-RS resource exceeds a threshold, the first additional duration or the second additional duration includes a first time period.

[0026] In some embodiments, when 3 TRPs or 4 TRPs are configured, the value of the threshold is 8; or, when 2 TRPs are configured, the value of the threshold is 16.

[0027] In some embodiments, when the UE supports TRP selection, the first additional duration or the second additional duration includes a second time period.

[0028] In some embodiments, in the case where the UE supports selection of a beam number combination, the first additional duration or the second additional duration includes a third time period.

[0029] In some embodiments, the processor is further configured to: transmit, via the transceiver, UE capability information indicating one or more additional time durations, wherein the one or more additional time durations include a first time period, a second time period, or a third time period.

[0030] In some embodiments, the first additional duration or the second additional duration is determined according to one or more additional durations reported by the UE, predetermined by a specification, or configured by a BS based on the one or more additional durations reported by the UE.

[0031] In some embodiments, the first additional duration or the second additional duration is associated with the minimum SCS of: the SCS of the PDCCH carrying the DCI that triggers the SCI report; the SCS of the uplink transmission carrying the CSI report; or the minimum SCS of the non-periodic CSI-RS triggered by the DCI.

[0032] In some embodiments, the first additional time duration or the second additional time duration includes a number of orthogonal frequency division multiplexing (OFDM) symbols.

[0033] In some embodiments, the first additional duration and the second additional duration have the same value.

[0034] In some embodiments, the first additional duration and the second additional duration may be based on different SCS scaling.

[0035] Another embodiment of the present disclosure provides a BS, comprising: a transceiver; and a processor coupled to the transceiver and configured to: transmit, via the transceiver, configuration information indicating the number of CSI-RS resources in a CSI-RS resource set and configuration information of DRX; and receive, via the transceiver, a CSI report based on a temporal relationship between the number of CSI-RS resources in the CSI-RS resource set and a CSI reference resource, wherein at least one CSI-RS resource in the CSI-RS resource set is within a DRX activity duration.

[0036] In some embodiments, the CSI report is received only if the CSI-RS transmission timing for each CSI-RS resource in the CSI-RS resource set is earlier than or co-in-time with the CSI-RS reference resource in the time domain.

[0037] In some embodiments, the CSI report is received when a first CSI-RS transmission timing for a first CSI-RS resource in the CSI-RS resource set is earlier than or is at the same time as the CSI reference resource in the time domain, and a second CSI-RS transmission timing for a second CSI-RS resource in the CSI-RS resource set is later than the CSI reference resource in the time domain; or the CSI report is received when a first CSI-RS transmission timing for a first CSI-RS resource in the CSI-RS resource set is earlier than or is at the same time as the CSI reference resource in the time domain, and a second CSI-RS transmission timing for a second CSI-RS resource in the CSI-RS resource set is earlier than or is at the same time as the CSI reference resource in the time domain.

[0038] In some embodiments, the CSI report is based on the first CSI-RS resource in the CSI-RS resource set.

[0039] In some embodiments, the CSI report is based on the first CSI-RS resource in the CSI-RS resource set, or based on both the first CSI-RS resource and the second CSI-RS resource in the CSI-RS resource set.

[0040] Another embodiment of the present disclosure provides a method performed by a UE, which includes: receiving configuration information indicating the number of CSI-RS resources in a CSI-RS resource set serving as channel measurement resources; determining a first symbol associated with a first additional duration and a second symbol associated with a second additional duration; and transmitting the CSI report when the uplink transmission carrying the CSI report is later than the first symbol after the end of the last symbol of the PDCCH that triggers the CSI report or is at the same time as the first symbol; and transmitting the CSI report when the uplink transmission carrying the CSI report is later than the second symbol after the end of the last symbol of the non-periodic CSI-RS resources for channel measurement, the non-periodic CSI-IM for interference measurement, and the non-periodic NZP CSI-RS for interference measurement or is at the same time as the second symbol.

[0041] Another embodiment of the present disclosure provides a method performed by a BS, which includes: transmitting configuration information indicating the number of CSI-RS resources in a CSI-RS resource set that serve as channel measurement resources; determining a first symbol associated with a first additional duration and a second symbol associated with a second additional duration; and receiving the CSI report when the uplink transmission carrying the CSI report is later than the first symbol after the end of the last symbol of the PDCCH that triggers the CSI report or is at the same time as the first symbol; and receiving the CSI report when the uplink transmission carrying the CSI report is later than the second symbol after the end of the last symbol of the non-periodic CSI-RS resources for channel measurement, the non-periodic CSI-IM for interference measurement, and the non-periodic NZP CSI-RS for interference measurement or is at the same time as the second symbol.

[0042] Another embodiment of the present disclosure provides a method performed by a UE, comprising: receiving configuration information indicating the number of CSI-RS resources in a CSI-RS resource set and configuration information of DRX; and transmitting a CSI report based on a temporal relationship between the number of CSI-RS resources in the CSI-RS resource set and a CSI reference resource, wherein at least one CSI-RS resource in the CSI-RS resource set is within a DRX activity duration.

[0043] Another embodiment of the present disclosure provides a method performed by a BS, comprising: transmitting configuration information indicating the number of CSI-RS resources in a CSI-RS resource set and configuration information of DRX; and receiving a CSI report based on a time relationship between the number of CSI-RS resources in the CSI-RS resource set and a CSI reference resource, wherein at least one CSI-RS resource in the CSI-RS resource set is within a DRX activity duration. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to illustrate the manner in which the advantages and features of the present application can be obtained, the description of the present application is presented by reference to specific embodiments of the present application illustrated in the accompanying drawings. These drawings depict only example embodiments of the present application and therefore should not be considered limiting of its scope.

[0045] Figure 1 A schematic diagram illustrating a wireless communication system 100 is depicted, in accordance with some embodiments of the present application.

[0046] Figure 2 The duration of CSI calculation according to some embodiments of the present disclosure is described.

[0047] Figure 3 A method for CJT performed by a UE according to some embodiments of the present disclosure is described.

[0048] Figure 4 A method for CJT performed by a BS according to some embodiments of the present disclosure is described.

[0049] Figure 5 A method for CJT performed by a UE according to some embodiments of the present disclosure is described.

[0050] Figure 6 A method for CJT performed by a BS according to some embodiments of the present disclosure is described.

[0051] Figure 7 A simplified block diagram illustrating an apparatus according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0052] The detailed description of the accompanying drawings is intended as a description of the presently preferred embodiments of the present disclosure and is not intended to represent the only form in which the present disclosure can be practiced. It should be understood that the same or equivalent functions can be achieved by different embodiments that are intended to be included in the spirit and scope of the present invention.

[0053] Although operations are depicted in a particular order in the figures, those skilled in the art will readily recognize that such operations need not be performed in the particular order shown, or in sequential order, or that all illustrated operations need not be performed to achieve a desired result; one or more operations may sometimes be skipped. Furthermore, the figures may schematically depict one or more example processes in the form of flow charts. However, other operations not depicted may be incorporated into the schematically illustrated example processes. For example, one or more additional operations may be performed before, after, concurrently with, or between any of the illustrated operations. In certain circumstances, multitasking and parallel processing may be advantageous.

[0054] Reference will now be made in detail to some embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. For ease of understanding, embodiments are provided in specific network architectures and new service scenarios, such as cellular telephone networks, networks based on time division multiple access (TDMA), networks based on code division multiple access (CDMA), networks based on orthogonal frequency division multiple access (OFDMA), LTE networks, networks based on the Third Generation Partnership Project (3GPP), LTE, Advanced LTE (LTE-A), 3GPP 4G, 3GPP 5GNR, 3GPP Release 16 and later, satellite communication networks, high-altitude platform networks, etc. It is contemplated that as network architectures and new service scenarios evolve, all embodiments in the present disclosure are also applicable to similar technical problems; and in addition, the terms cited in the present disclosure may change without affecting the principles of the present disclosure.

[0055] Figure 1 A schematic diagram illustrating an exemplary wireless communication system 100 is depicted, in accordance with some embodiments of the present application.

[0056] refer to Figure 1 , the wireless communication system 100 may include a BS 101, TRPs 103 (e.g., TRPs 103a and 103b), and UEs 105 (e.g., UEs 105a, 105b, and 105c). Although only one BS 101, two TRPs 103, and three UEs 105 are shown for simplicity, it should be noted that according to some other embodiments of the present application, the wireless communication system 100 may include more or fewer communication devices, apparatuses, or nodes.

[0057] The wireless communication system 100 may be compatible with any type of network that may be capable of sending and receiving wireless communication signals. For example, the wireless communication system 100 may be compatible with a wireless communication network, a cellular telephone network, a time division multiple access (TDMA)-based network, a code division multiple access (CDMA)-based network, an orthogonal frequency division multiple access (OFDMA)-based network, an LTE network, a 3GPP-based network, a 3GPP 5G network, a satellite communication network, a high altitude platform network, and / or other communication networks.

[0058] BS 101 may also be referred to as an access point, an access terminal, a base station, a macrocell, a Node-B, an enhanced or evolved Node-B (eNB), a generalized Node-B (gNB), a home Node-B, a relay node, or a device, or described using other terms used in the art. BS 101 is typically part of a radio access network that may include a controller communicatively coupled to BS 101.

[0059] TRPs 103 (e.g., TRP 103a and TRP 103b) may communicate with BS 101 via, for example, a backhaul link. Each of TRPs 103 may serve some or all of UEs 105. Figure 1 As shown, TRP 103a may serve some mobile stations (including UE 105a, UE 105b, and UE 105c) within a service area or region (e.g., a cell or cell sector). TRP 103b may serve some mobile stations (including UE 105a, UE 105b, and UE 105c) within a service area or region (e.g., a cell or cell sector). In some other embodiments, TRP 103a and TRP 103b may serve different UEs. TRP 103a and TRP 103b may communicate with each other via, for example, a backhaul link.

[0060] In some embodiments of the present application, a TRP may perform CJT with the UE 105. All TRPs involved in the CJT may have the same antenna configuration but be located at different locations. In CJT, each TRP may transmit the same data to the UE 105. Each TRP may be configured and use the same number of antenna ports to transmit using the CSI-RS resources used for channel measurement. In other words, one TRP may correspond to one CSI-RS resource. Therefore, in the present disclosure, the expressions "per TRP" and "per CSI-RS resource" may be used interchangeably, the expressions "across TRPs" and "across CSI-RS resources" may be used interchangeably, or the like.

[0061] According to some embodiments of the present application, UE 105 may be a computing device, such as a desktop computer, a laptop computer, a personal digital assistant (PDA), a tablet computer, a smart TV (e.g., a TV connected to the Internet), a set-top box, a game console, a security system (or security camera), an in-vehicle computer, a network device (e.g., a router, a switch, and a modem), or the like.

[0062] According to some embodiments of the present application, UE 105 may include a portable wireless communication device, a smartphone, a cellular phone, a flip phone, a device with a subscriber identity module, a personal computer, a selective call receiver, or any other device capable of sending and receiving communication signals on a wireless network.

[0063] According to some embodiments of the present application, UE 105 may include a wearable device, such as a smart watch, a fitness band, an optical head-mounted display, or the like.

[0064] Furthermore, UE 105 may be referred to as a subscriber unit, mobile, mobile station, user, terminal, mobile terminal, wireless terminal, fixed terminal, subscriber station, user terminal, or device, or described using other terminology used in the art.

[0065] In 3GPP Release 16 (Rel-16) or Release 17 (Rel-16), features focusing on non-coherent joint transmission (NC-JT) to facilitate the deployment of multiple TRPs have been introduced. In 3GPP Release 18 (Rel-18), it is important to identify and specify the necessary enhancements for both downlink and uplink multiple-input multiple-output (MIMO) to facilitate the use of large antenna arrays not only for frequency range 1 (FR1) (e.g., 450 MHz to 6 GHz) but also for frequency range 2 (FR2) (e.g., 24.25 GHz to 52.6 GHz) to meet the requirements of the evolution of NR deployment.

[0066] CJT can improve coverage, average cell throughput, and cell-edge throughput in commercial deployments by leveraging high-performance backhaul and synchronization. It also provides enhanced channel state information (CSI) acquisition for frequency division duplex (FDD) and time division duplex (TDD), which can be beneficial in expanding the utility of multi-TRP deployments. Therefore, CJT can be further studied in Rel-18.

[0067] With the continued evolution of MIMO, it is now agreed to specify enhancements to CSI acquisition for CJT for FR1 and up to 4 TRPs, assuming ideal backhaul and synchronization and the same number of antenna ports across the TRPs. The maximum number of CSI-RS ports per CSI-RS resource can be 32. Since the number of TRPs configured for CJT can be 2, 3, and 4, the maximum number of CSI-RS ports across a CSI-RS resource can be 128. Each CSI-RS resource can have the same number of CSI-RS ports.

[0068] In the Type II codebook refinement for multiple TRPs of CJT, regarding spatial domain (SD) based (i.e., beam) selection, in N TRPIn the case where candidate TRPs (or candidate CSI-RS resources) are configured by the BS, the BS may configure the candidate TRPs from the set of beam numbers (i.e., {L1, ..., L NTRP}) value N L combinations, where L i It is TRP i The number of beams, i = 1, ..., N TRP .

[0069] In some embodiments, the UE may perform a CJT from N TRP In some other embodiments, the UE may perform a CJT from N candidate CSI-RS resources. L (N L >1) configured combinations. In other words, the UE can support beam number combination selection and indicate the selected beam number combination in the CSI report. As the CSI-RS resources used for CJT, TRP selection, and beam number combination selection increase, the UE processing complexity of CSI in CJT scenarios increases significantly.

[0070] Regarding legacy CSI calculation and measurement, when a field included in the DCI (e.g., the CSI request field) triggers a CSI report on the PUSCH, the UE may provide a valid CSI report for the triggered report (e.g., the nth triggered report) if the following two conditions are met:

[0071] 1. The first uplink symbol used to carry the corresponding CSI report including the effect of timing advance, no earlier than symbol Z ref Start at, and

[0072] 2. The first uplink symbol used to carry the nth CSI report including the effect of timing advance, no earlier than symbol Z' ref (n) starts.

[0073] where Z ref It is defined as the CP starts after the last symbol of the PDCCH that triggers the CSI report. proc,CSI =(Z)(2048+144)·κ2 -μ ·T C +T switch The next uplink symbol, and where Z' ref (n) is defined as the time at which the CP starts T′ after the end of the last symbol in time of the latest of the following proc,CSI= (Z′)(2048 + 144)·κ2 -μ ·T C The next uplink symbol of: The aperiodic CSI-RS resource for channel measurement, the aperiodic CSI-IM for interference measurement, and the aperiodic NZP CSI-RS for interference measurement, when the aperiodic CSI-RS is used for channel measurement of the nth triggered CSI report. Z ref and Z' ref (n)'s detailed CP start can be found in 3GPP documents, such as in TS38.214, and the details are omitted here.

[0074] The above duration, for example, Z ref and Z' ref (n), without considering the increased CSI-RS resources for CJT, TRP selection, and beam number combination selection, may no longer be suitable for the UE to provide CSI reports. The present disclosure proposes to introduce one or more additional durations for some UEs, and the one or more additional durations can be used by the UE to perform CSI calculations.

[0075] Figure 2 Illustrate the duration of CSI calculation according to some embodiments of the present disclosure.

[0076] In Figure 2 , the UE can receive DCI that can trigger one or more CSI reports, and the UE can provide a valid CSI report on the PUSCH. The UE can receive a set of CSI-RS resources containing Ks CSI-RS resources for channel measurement, where Ks can be the total number of CSI-RS resources in the CSI-RS resource set for channel measurement. For different values of Ks, different numbers of CSI-RS ports per CSI-RS resource can be configured as follows:

[0077] ο When Ks = 1, each CSI-RS resource can be configured with at most 32 CSI-RS ports.

[0078] ο When Ks = 2, each CSI-RS resource can be configured with at most 16 CSI-RS ports.

[0079] ο 2 < Ks <= 8, each CSI-RS resource can be configured with at most 8 CSI-RS ports.

[0080] For the CSI report in one or more CSI reports, for example, the nth triggered report, the UE can determine the time valid for providing the CSI report, which is associated with two symbols, and for simplicity, the two symbols are denoted as Z4 and Z4'.

[0081] Z4 can be defined as the time when the CP starts after the last symbol of the PDCCH ends. proc,CSI =(Z)(2048+144)·κ2 -μ ·T C +T switch The CP start may be the same as defined in 3GPP documents (eg, TS 38.214), and the details are omitted here.

[0082] The UE may also receive one or more aperiodic CSI-RS resources for channel measurement, one or more aperiodic CSI-IMs for interference measurement, and / or one or more aperiodic NZP CSI-RSs for interference measurement. The aperiodic CSI-RS resources, the aperiodic CSI-IMs, and the aperiodic NZP CSI-RSs may not be received simultaneously, and one of them may be received last in time.

[0083] Z4' may be defined as the latest of the following whose CP starts T' after the end of the last symbol in time proc,CSI =(Z′)(2048+144)·κ2 -μ ·T C The next uplink symbol of: aperiodic CSI-RS resources for channel measurement, aperiodic CSI-IM for interference measurement, and aperiodic NZP CSI-RS for interference measurement. The CP start may be the same as defined in 3GPP documents (e.g., TS 38.214), and the details are omitted here.

[0084] For example, in Figure 2 Therefore, Z4' can be defined as the time after the last symbol of CSI-RS ends and its CP starts T'. proc,CSI =(Z′)(2048+144)·κ2 -μ ·T C The next uplink symbol.

[0085] The UE may prepare the nth triggered CSI report before the start of PUSCH.

[0086] In the present disclosure, depending on different UE capabilities (or different UE behaviors), the durations Z4 and Z4′ may be associated with additional durations, and the detailed durations may be further described in the following four cases.

[0087] Case 1

[0088] In case 1, the UE may not support TRP selection or beam number combination selection; or the UE may support TRP selection and beam number combination selection, but may not perform TRP selection or beam number combination selection.

[0089] Based on the total number of CSI-RS ports (the maximum number of CSI-RS ports across N CSI-RSs can be 128) and the total number of TRPs, the following scenarios may exist:

[0090] 1. Scenario 1: For 3 TRPs or 4 TRPs, the total number of CSI-RS ports per CSI-RS resource may be less than or equal to 8; and

[0091] 2. Scenario 2: For 2 TRPs, the total number of CSI-RS ports per CSI-RS resource may be less than or equal to 16.

[0092] For the above two scenarios, the traditional CSI calculation table can be reused and the details are omitted here. For scenarios 1 and 3, parallel CPUs can be used for 3 TRPs, and 4 parallel CPUs can be used for 4 TRPs. For scenario 2, 2 parallel CPUs can be used for 2 TRPs.

[0093] The following scenarios may also exist:

[0094] 1. Scenario 3: For 3 CSI-RS resources in a CSI-RS resource set or 4 CSI-RS resources in a CSI-RS resource set, the total number of CSI-RS ports per CSI-RS resource may be greater than 8; and

[0095] 2. Scenario 4: For two CSI-RS resources in a CSI-RS resource set, the CSI-

[0096] The total number of RS ports can be greater than 16.

[0097] For the above two scenarios, the time to perform CSI reporting (ie, CSI calculation time) may be longer than that of the above scenarios 1 and 2, and the currently configured CSI calculation time may not be sufficient for the UE to prepare the CSI report.

[0098] Therefore, in order to prepare CSI reports, the present disclosure proposes to introduce one or more additional time durations for some UEs, which can be used by the UE to perform CSI calculations.

[0099] In some embodiments, the one or more additional durations may be determined by the UE and reported to the BS or to the network, for example, via UE capability information. In some other embodiments, the one or more additional durations may be determined by the BS or by the network based on the one or more additional durations reported by the UE. For example, the BS or the network may determine the one or more additional durations based on one or more additional durations reported from multiple UEs. In still other embodiments, the one or more additional durations may be specified in the specification. In still other embodiments, one or more longer durations may be defined (e.g., the sum of the currently used duration plus the additional duration).

[0100] In some embodiments, one or more durations (which may be represented by Z4 and Z'4) with additional durations (which may be represented by x7, x7', x8, x8', x9, and x9') may be represented as the following table:

[0101] Table 1: CSI calculation latency requirements for CJT

[0102]

[0103] where μ corresponds to μ PDCCH 、μ CSI-RS and μ UL The minimum value among them, where μ PDCCH Corresponding to the subcarrier spacing of the PDCCH at which the DCI is transmitted, μ CSI-RS corresponds to the minimum subcarrier spacing of the aperiodic CSI-RS triggered by DCI, and μ UL Corresponds to the subcarrier spacing of the PUSCH at which the CSI report will be transmitted.

[0104] Z4 [symbols] may correspond to an additional duration for CSI reporting, where Z4 may be defined as the time after the last symbol of the PDCCH ends and its CP starts T proc,CSI =(Z)(2048+144)·κ2 -μ ·T C +T switch For example, a value such as "40+x7" in the third row may correspond to the next uplink symbol where the CP starts after the last symbol of the PDCCH ends. It should be noted that values such as "40," "72," and "141" are for illustration only and not limitation, and other values may also be applied to the solutions of the present disclosure.

[0105] Z'4 can be defined as the time at which the CP starts after the last symbol in time of the latest of the following proc,CSI =(Z′)(2048+144)·κ2 -μ ·T CThe next uplink symbol of the following: aperiodic CSI-RS resources for channel measurement, aperiodic CSI-IM for interference measurement, and aperiodic NZP CSI-RS for interference measurement. For example, a value such as "37+x7'" in the third row may correspond to the next uplink symbol in which the CP begins after the end of the latest of the following: aperiodic CSI-RS resources for channel measurement, aperiodic CSI-IM for interference measurement, and aperiodic NZP CSI-RS for interference measurement. It should be noted that values such as "37," "69," and "140" are for illustration only and not limitation, and other values may also be applied to the solutions of the present disclosure.

[0106] The additional duration x7, x7', x8, x8', x9, or x9' may comprise a number of OFDM symbols. For example, the value of x7 may comprise an integer number of OFDM symbols, such as 0 OFDM symbols, 10 OFDM symbols, 18 OFDM symbols, or 37 OFDM symbols, or the like. For 0 OFDM symbols, this means that no additional duration is required. Similarly, the values of x7', x8, x8', x9, and x9' may also comprise an integer number of OFDM symbols. In some embodiments, for UEs with lower processing capabilities, the value of x7 may be 37 OFDM symbols. For UEs with higher processing capabilities, the value of x7 may be 18 OFDM symbols.

[0107] In some embodiments, the additional durations of Z4 and Z4' corresponding to the same SCS may be the same or different. That is, parameters x7 and x7' may have the same value or different values. Similarly, parameters x8 and x8' may have the same value or different values, and parameters x9 and x9' may have the same value or different values.

[0108] In some embodiments, the additional duration may be scalable for different SCSs. For example, x9 may have a value that is twice (or approximately twice, three times, four times, etc.) the value of x8, and x8 may have a value that is twice (or approximately twice, three times, four times, etc.) the value of x7. In other words, x9 = 2 × x8 = 4 × x7. Similarly, x9' may have a value that is twice (or approximately twice, three times, four times, etc.) the value of x8', and x8 may have a value that is twice (or approximately twice, three times, four times, etc.) the value of x7'.

[0109] The above table may have more rows, for example, the value of μ may be 3, 4, etc., and accordingly, durations (eg, Z4 and Z4') with additional durations (eg, x7, x7', x8, x8', x9, and x9') may be configured in a similar manner.

[0110] Case 2

[0111] In case 2, the UE may support TRP selection but not beam number combination selection. Alternatively, the UE may also support both TRP selection and beam number combination selection, but may only perform TRP selection but not beam number combination selection.

[0112] For simplicity, the total number of TRPs is expressed as N TRP , and for simplicity, the total number of selected TRPs is expressed as N, and the UE can select TRP In other words, the UE can select N TRPs from the N TRPs configured by the BS. TRP N CSI-RS resources are selected from the N CSI-RS resources, and the N selected CSI-RS resources can be transmitted to the BS or network (or TRP selection is transmitted) as part of the CSI report. That is, the CSI report can include TRP Select N CSI-RS resources from candidate CSI-RS resources.

[0113] The UE may require additional duration for TRP selection, which may be related to the TRP selection algorithm.

[0114] In some embodiments, the best selection scheme may be used for TRP selection, and the additional duration may be proportional to the number of possible candidates for TRP selection (e.g., N TRP ) and the total number of simultaneous CSI calculations supported (i.e., the total number of CSI processing units (CPUs)). The actual value may be variable due to different UE implementations (e.g., parallel or serial allocation of processing power) and / or due to different UE capabilities or UE behaviors. The UE may report one or more additional durations for TRP selection (e.g., one or more of the additional durations x7, x7', x8, x8', x9, or x9' described above in Table 1) to the BS (or network) based on the implementation scheme (which may be adopted by the UE or configured by the BS) and / or UE capabilities. It should be noted that the values of the additional durations (e.g., x7, x7', x8, x8', x9, or x9') may be the same as or different from the values in Case 1.

[0115] In some other embodiments, a suboptimal selection scheme may be used for TRP selection, for example, a TRP may be selected based on the RSRP value. In this case, there may be no need to increase the CSI calculation time for TRP selection compared to the CSI calculation time for a CJT that does not support TRP selection. In some embodiments, if one or more additional durations for a CJT that supports TRP selection are not reported, the value of the additional duration for a CJT that supports TRP selection may be 0, and the CSI calculation time for a CJT that supports TRP selection may be the same as the CSI calculation time for a CJT that does not support TRP selection.

[0116] Case 3

[0117] In case 3, the UE may support beam number combination selection but not TRP selection. Alternatively, the UE may also support both TRP selection and beam number combination selection, but may only perform beam number combination selection and not TRP selection.

[0118] For N TRP The configuration value of {L1, ..., L NTRP} a group of N L When the number of beam combinations is N L >1, for {L1,…,L NTRP The selected value combination of} can be reported by an indicator in the CSI report. For example, N configured for CJT TRP It can be 2, 3 or 4, and the number of candidate beam combinations N L Can be 1, 2 or 4. In this case, the additional UE implementation complexity is related to the beam selection algorithm. An additional duration can be used for beam combination selection, and the actual time may be related to the beam selection algorithm.

[0119] In some embodiments, an optimal beam selection scheme may be used, and the additional CSI calculation time is proportional to the number of beam combinations N. L The actual value may vary due to different UE implementations and / or different UE capabilities. In some embodiments, the UE may report one or more additional durations (e.g., one or more of the additional durations x7, x7', x8, x8', x9, or x9' in Table 1) based on an implementation scheme (which may be adopted by the UE or configured by the BS) and / or UE capabilities. It should be noted that the value of the additional duration (e.g., x7, x7', x8, x8', x9, or x9') may be the same as or different from the value in Case 1 or Case 2.

[0120] In some embodiments, a suboptimal beam number combination selection scheme may be used. For example, the beam number combination may be selected based on the singular values of the corresponding beams. In this case, there may be no need to increase the CSI calculation time for beam number combination selection compared to the CSI calculation time for a CJT that does not support beam number combination selection. In some embodiments, if one or more additional durations for a CJT that supports beam number combination selection are not reported, the value of the additional duration for a CJT that supports beam number combination selection may be 0, and the CSI calculation time for a CJT that supports beam number combination selection may be the same as the CSI calculation time for a CJT that does not support beam number combination selection.

[0121] Case 4

[0122] In case 4, the UE may perform both TRP selection and beam number combination selection. In this case, the designs for additional duration described in cases 2 and 3 may be combined.

[0123] Similarly, in the case where the UE can support both TRP selection and beam number combination selection, the UE may report additional durations (e.g., one or more of the above-mentioned additional durations x7, x7', x8, x8', x9 or x9' in Table 1).

[0124] For special suboptimal implementations, the additional duration may be a value of 0. In some embodiments, if one or more additional durations for a CJT supporting both TRP selection and beam number combination selection are not reported, the value of the additional duration for a CJT supporting both TRP selection and beam number combination selection may be 0, and the CSI calculation time for a CJT supporting both TRP selection and beam number combination selection may be the same as the CSI calculation time for a CJT not supporting beam number combination selection.

[0125] For the above cases, it should be noted that the additional durations x7, x7', x8, x8', x9 or x9' in Table 1 are, for example, for different UE capabilities and / or different UE behaviors. For the same UE, the additional duration x7 for case 1 may have a minimum value, and the additional duration x7 for case 4 may have a maximum value. There may also be other additional durations corresponding to other SCSs. These additional durations may be determined by the UE and reported to the BS or network, for example, through the UE capabilities, or may be determined by the BS or network based on one or more additional durations reported by the UE, or may be specified in the specification. One or more additional durations may be reported to the BS, such as UE capabilities, which respectively correspond to one or more aspects including TRP number, CSI-RS port number, TRP selection or beam number combination selection.

[0126] For non-coherent joint transmission (NCJT), the UE can be configured to perform discontinuous reception (i.e., the UE can receive DRX configuration information). The CSI-RS resource set for non-CJT can be configured with two resource groups and several resource pairs. The UE transmits a CSI report only if it receives at least one CSI-RS transmission opportunity for each CSI-RS resource in a resource pair no later than the same DRX active time as the CSI reference resource; otherwise, the report is discarded.

[0127] For CJT, there can be up to 4 NZP CSI-RS for channel measurement resources (CMR) in one CSI-RS resource set. TRP The CSI-RS resources may be located in two consecutive time slots, for example, time slot n and time slot n+1.

[0128] It is possible that some CSI-RS resources (eg, in slot n) may be received no later than the CSI reference resources, and other CSI-RS resources (eg, in slot n+1) may be received later than the CSI reference resources.

[0129] This disclosure proposes some solutions for enabling UE to perform CSI reporting as follows:

[0130] Example 1:

[0131] In this embodiment, the UE can transmit a CSI report when at least one CSI-RS transmission opportunity for each CSI-RS resource in the CSI-RS resource set used for CMR falls within the same DRX active period no later than that of the CSI reference resource. In other words, the UE can transmit a CSI report when at least one CSI-RS transmission opportunity for each CSI-RS resource in slot n and each CSI-RS resource in slot n+1 (if any) falls within the same DRX active period that is earlier than or concurrent with the CSI reference resource. Otherwise, the UE cannot transmit a CSI report. In this embodiment, the transmission opportunity can be defined on a per-CSI-RS resource basis. Furthermore, it can be defined on a CSI-RS resource set basis, where all CSI-RS resources in a CSI-RS resource set share the same transmission opportunity.

[0132] For example, there is a CSI-RS resource set including CSI-RS resource 1 in time slot n and CSI-RS resource 2 in time slot n + 1. CSI-RS transmission opportunity 1 for CSI-RS resource 1 is within the same DRX active time no later than that of the CSI reference resource, and CSI-RS transmission opportunity 2 for CSI-RS resource 2 is also within the same DRX active time no later than that of the CSI reference resource, and the UE can transmit a CSI report.

[0133] Example 2:

[0134] In this embodiment, the UE may transmit a CSI report when at least one CSI-RS transmission opportunity for any CSI-RS resource in the CSI-RS resource set for CMR is within the same DRX active time or longer than the CSI reference resource. For example, if CSI-RS resource 1 in slot n and / or CSI-RS resource 2 in slot n+1 are present in the CSI-RS resource set, CSI-RS transmission opportunity 1 for CSI-RS resource 1 is within the same DRX active time or longer than the CSI reference resource, and CSI-RS transmission opportunity 2 for CSI-RS resource 1 is later than the same DRX active time of the CSI reference resource, the UE may transmit a CSI report. TRP selection may be performed on CSI-RS resources that are no later than the CSI reference resource. That is, TRP selection may be performed on CSI-RS resources that include CSI-RS resource 1 but do not include CSI-RS resource 2.

[0135] In other words, when there is no CSI-RS transmission opportunity for any CSI-RS resource in the CSI-RS resource set for CMR within the same DRX active time not later than the CSI reference resource, the UE may not transmit a CSI report.

[0136] Example 3:

[0137] In this embodiment, the UE may transmit a CSI report when at least one CSI-RS transmission opportunity of any CSI-RS resource in the CSI-RS resource set used for CMR is within the same DRX active time no later than the CSI reference resource. There is no restriction on CSI reporting. In other words, there is no restriction on the CSI-RS resources in the CSI-RS resource set used for CSI report update, and the UE may use all CSI-RS resources if it is able to complete CSI calculation based on these CSI-RS resources. Compared with embodiment 2, the UE may perform TRP selection without restriction, which means that TRP selection may be performed in CSI-RS resources that are later than or no later than the CSI reference resource. TRP selection may be performed between CSI-RS resources including both CSI-RS resource 1 (no later than the CSI reference resource) and CSI-RS resource 2 (later than the CSI reference resource).

[0138] Figure 3 A method for CJT performed by a UE according to some embodiments of the present disclosure is described. Figure 4 The method for CJT performed by the BS according to some embodiments of the present disclosure is described, which corresponds to the method performed by the BS as shown in FIG. Figure 3 The method performed by the UE shown in FIG.

[0139] In operation 301, the UE may receive configuration information indicating the number of CSI-RS resources in a CSI-RS resource set serving as channel measurement resources, i.e., the UE may be configured to perform CJT; in operation 302, the UE may determine a first symbol associated with a first additional duration and a second symbol associated with a second additional duration; and in operation 303, the UE may transmit the CSI report via the transceiver when the uplink transmission carrying the CSI report is later than the first symbol after the end of the last symbol of the PDCCH triggering the CSI report or at the same time as the first symbol; and the uplink transmission carrying the CSI report is later than the second symbol after the end of the last symbol of the non-periodic CSI-RS resources for channel measurement, the non-periodic CSI-IM for interference measurement, and the non-periodic NZP CSI-RS for interference measurement or at the same time as the second symbol.

[0140] Accordingly, in operation 401, the BS may transmit configuration information indicating the number of CSI-RS resources in a CSI-RS resource set serving as channel measurement resources; in operation 402, the BS may determine a first symbol associated with a first additional duration and a second symbol associated with a second additional duration; and in operation 403, the BS may receive the CSI report via a transceiver when the uplink transmission carrying the CSI report is later than the first symbol after the end of the last symbol of the PDCCH triggering the CSI report or at the same time as the first symbol; and receive the CSI report when the uplink transmission carrying the CSI report is later than the second symbol after the end of the last symbol of the non-periodic CSI-RS resources for channel measurement, the non-periodic CSI-IM for interference measurement, and the non-periodic NZP CSI-RS for interference measurement or at the same time as the second symbol.

[0141] In some embodiments, the first symbol is determined by a third symbol defined by the specification and the first additional duration, and the second symbol is determined by a fourth symbol defined by the specification and the second additional duration. For example, as shown in Table 1, the first symbol may be "40+x7," as shown in the third row, which is determined by the third symbol (having a value of 40, which may be defined by the specification) and the first additional duration (which may be x7). The second symbol may be "37+x7," as shown in the third row, which is determined by the fourth symbol (having a value of 37, which may be defined by the specification) and the second additional duration (which may be x7').

[0142] In some embodiments, when the total number of CSI-RS ports per CSI-RS resource exceeds a threshold, the first additional duration or the second additional duration includes a first time period. In some embodiments, when 3 TRPs or 4 TRPs are configured, the threshold value is 8; or when 2 TRPs are configured, the threshold value is 16.

[0143] In some embodiments, when the UE supports TRP selection, the first additional duration or the second additional duration includes a second time period.

[0144] In some embodiments, in the case where the UE supports selection of a beam number combination, the first additional duration or the second additional duration includes a third time period.

[0145] In some embodiments, the UE may transmit UE capability information to the BS that may indicate one or more additional durations, where the one or more additional durations include the first time period, the second time period, or the third time period. For example, the UE may transmit UE capability information that may indicate one or more of the aforementioned x7, x7', x8, x8', x9, and x9'.

[0146] In some embodiments, the first additional duration or the second additional duration is determined according to one or more additional durations reported by the UE, predetermined by a specification, or configured by a base station (BS) based on the one or more additional durations reported by the UE.

[0147] In some embodiments, the first additional duration or the second additional duration is associated with a minimum SCS of:

[0148] The SCS of the PDCCH carrying the DCI that triggered the SCI report;

[0149] the SCS of the uplink transmission carrying the CSI report; or

[0150] The minimum SCS of the aperiodic CSI-RS triggered by the DCI.

[0151] In some embodiments, the first additional duration or the second additional duration includes a number of OFDM symbols, such as 10 OFDM symbols, 18 OFDM symbols, etc.

[0152] In some embodiments, the first additional duration and the second additional duration have the same value.

[0153] In some embodiments, the first additional duration and the second additional duration may be based on different SCS scaling.

[0154] Figure 5 A method for CJT performed by a UE according to some embodiments of the present disclosure is described. Figure 6 The method for CJT performed by the BS according to some embodiments of the present disclosure is described, which corresponds to the method performed by the BS as shown in FIG. Figure 5 The method performed by the UE shown in FIG.

[0155] In operation 501, the UE may receive configuration information indicating the number of CSI-RS resources in a CSI-RS resource set and configuration information of DRX; and in operation 502, the UE may transmit a CSI report based on a time relationship between the number of CSI-RS resources in the CSI-RS resource set and a CSI reference resource, wherein at least one CSI-RS resource in the CSI-RS resource set is within a DRX activity duration.

[0156] Accordingly, on the BS side, in operation 601, the BS may transmit configuration information indicating the number of CSI-RS resources in the CSI-RS resource set and configuration information of DRX; and in operation 602, the BS may receive a CSI report based on the time relationship between the number of CSI-RS resources in the CSI-RS resource set and the CSI reference resource, wherein at least one CSI-RS resource in the CSI-RS resource set is within the DRX activity duration.

[0157] In some embodiments, the CSI report is transmitted only if the CSI-RS transmission timing for each CSI-RS resource in the CSI-RS resource set is earlier than or co-in time with the CSI-RS reference resource in the time domain.

[0158] In some embodiments, the CSI report is transmitted when a first CSI-RS transmission timing for a first CSI-RS resource in the CSI resource-RS group is earlier than or is at the same time as the CSI reference resource in the time domain, and a second CSI-RS transmission timing for a second CSI-RS resource in the CSI-RS resource set is later than the CSI reference resource in the time domain; or the CSI report is transmitted when a first CSI-RS transmission timing for a first CSI-RS resource in the CSI-RS resource set is earlier than or is at the same time as the CSI reference resource in the time domain, and a second CSI-RS transmission timing for a second CSI-RS resource in the CSI-RS resource set is earlier than or is at the same time as the CSI reference resource in the time domain.

[0159] In some embodiments, the CSI report is based on the first CSI-RS resource in the CSI resource set.

[0160] In some embodiments, the CSI report is based on the first CSI-RS resource in the CSI resource set, or based on both the first CSI-RS resource and the second CSI-RS resource in the CSI resource set.

[0161] Figure 7 A simplified block diagram illustrating an apparatus according to some embodiments of the present disclosure.

[0162] like Figure 7 , an example of an apparatus 700 may include at least one processor 704 and at least one transceiver 702 coupled to the processor 704. The apparatus 700 may be a UE, a BS, or any other device having similar functionality.

[0163] Although elements such as at least one transceiver 702 and processor 704 are described in the singular in this figure, the plural is contemplated unless limitation to the singular is explicitly stated. In some embodiments of the present disclosure, transceiver 702 may be divided into two devices, such as receive circuitry and transmit circuitry. In some embodiments of the present disclosure, apparatus 700 may further include an input device, memory, and / or other components.

[0164] According to some embodiments of the present disclosure, the device 700 may be a UE. The transceiver 702 and the processor 704 may interact with each other to execute Figures 1 to 6 According to some embodiments of the present disclosure, the device 700 may be a BS. The transceiver 702 and the processor 704 may interact with each other to perform Figures 1 to 6 The operation of the BS described in any one of .

[0165] In some embodiments of the present disclosure, the apparatus 700 may further include at least one non-transitory computer-readable medium.

[0166] For example, in some embodiments of the present disclosure, a non-transitory computer-readable medium may store thereon computer-executable instructions to cause the processor 704 to implement the method described above regarding the UE. In some embodiments of the present disclosure, a non-transitory computer-readable medium may store thereon computer-executable instructions to cause the processor 704 to implement the method described above regarding the BS.

[0167] The methods of the present disclosure can be implemented on a programmed processor. However, the controller, flow charts, and modules can also be implemented on a general-purpose or special-purpose computer, a programmed microprocessor or microcontroller and peripheral integrated circuit components, an integrated circuit, hardware electronic or logic circuits (e.g., discrete element circuits), a programmable logic device, or the like. In general, any device having a finite state machine capable of implementing the flow charts shown in the figures can be used to implement the processing functions of the present disclosure.

[0168] Although the present disclosure has been described with reference to specific embodiments of the present disclosure, it is apparent that many alternatives, modifications, and variations will be apparent to those skilled in the art. For example, the various components of an embodiment may be interchanged, added, or replaced in other embodiments. Moreover, not all of the elements shown in each figure are necessary for the operation of the disclosed embodiments. For example, a person skilled in the art of the disclosed embodiments will be able to make and use the teachings of the present disclosure by simply adopting the elements of the independent claims. Therefore, the embodiments of the present disclosure set forth herein are intended to be illustrative and not restrictive. Various changes may be made without departing from the spirit and scope of the present disclosure.

[0169] In the present disclosure, relative terms such as "first", "second" and the like can be used alone to distinguish an entity or action from another entity or action, without necessarily requiring or implying any actual relationship or order between such entities or actions. The term "comprise / comprising" or any other variation thereof is intended to encompass non-exclusive inclusion, so that the process, method, article or equipment comprising a list of elements not only comprises those elements but also may comprise other elements that are not explicitly listed or that are intrinsic to this process, method, article or equipment. An element beginning with "a / an" or the like does not exclude the presence of additional identical elements in the process, method, article or equipment comprising the elements without further constraints. Moreover, the term "another" is defined as at least a second or more. As used herein, the terms "comprise", "have" and the like are defined as "comprising".

Claims

1. A user equipment (UE), comprising: transceiver; and a processor coupled to the transceiver and configured to: receiving, via the transceiver, configuration information indicating the number of CSI-RS resources in a channel state information-reference signal (CSI-RS) resource set as channel measurement resources; determining a first symbol associated with a first additional duration and a second symbol associated with a second additional duration; and transmitting the CSI report via the transceiver when an uplink transmission carrying the CSI report is later than or co-incident with the first symbol after the end of the last symbol of a physical downlink control channel (PDCCH) triggering the CSI report; And the CSI report is transmitted when the uplink transmission carrying the CSI report is later than the second symbol after the end of the last symbol of the aperiodic CSI-RS resources for channel measurement, the aperiodic channel measurement-interference measurement CSI-IM for interference measurement, and the aperiodic non-zero power NZP CSI-RS for interference measurement, or at the same time as the second symbol. 2 . The UE according to claim 1 , wherein the first symbol is determined by a third symbol defined by a specification and the first additional duration, and the second symbol is determined by a fourth symbol defined by the specification and the second additional duration. 3 . The UE according to claim 1 , wherein, if a total number of CSI-RS ports per Channel State Information-Reference Signal (CSI-RS) resource exceeds a threshold, the first additional duration or the second additional duration includes a first time period.

4. The UE according to claim 3, wherein when 3 transmitting or receiving points TRP or 4 TRP are configured, the value of the threshold is 8; or, when 2 TRPs are configured, the value of the threshold is 16.

5. The UE according to claim 1, wherein, when the UE supports TRP selection, the first additional duration or the second additional duration includes a second time period, or wherein, when the UE supports selection of a beam number combination, the first additional duration or the second additional duration includes a third time period.

6. The UE of claim 1 , wherein the processor is further configured to: UE capability information indicating one or more additional time durations is transmitted via the transceiver, wherein the one or more additional time durations include a first time period, a second time period, or a third time period.

7. The UE according to claim 1, wherein the first additional duration or the second additional duration is determined according to one or more additional durations reported by the UE, predetermined by a specification, or configured by a base station (BS) based on the one or more additional durations reported by the UE.

8. The UE according to claim 1 , wherein the first additional duration or the second additional duration is associated with the following minimum subcarrier spacing (SCS): an SCS of a physical downlink control channel PDCCH carrying downlink control information DCI triggering the SCI report; the SCS of the uplink transmission carrying the CSI report; or The minimum SCS of the aperiodic CSI-RS triggered by the DCI. 9 . The UE according to claim 8 , wherein the first additional time duration or the second additional time duration comprises a number of Orthogonal Frequency Division Multiplexing (OFDM) symbols. 10 . The UE of claim 8 , wherein the first additional duration and the second additional duration have the same value.

11. The UE of claim 8, wherein the first additional duration and the second additional duration are capable of being scaled based on different SCSs.

12. A user equipment (UE), comprising: transceiver; and a processor coupled to the transceiver and configured to: receiving, via the transceiver, configuration information indicating the number of CSI-RS resources in a channel state information-reference signal (CSI-RS) resource set and configuration information for discontinuous reception (DRX); and A CSI report is transmitted via the transceiver based on a temporal relationship between the number of CSI-RS resources in the CSI-RS resource set and a channel state information (CSI) reference resource, wherein at least one CSI-RS resource in the CSI-RS resource set is within a DRX active duration.

13. The UE of claim 12, wherein the CSI report is transmitted only if a CSI-RS transmission timing for each CSI-RS resource in the CSI-RS resource set is earlier than or co-in time with the CSI-RS reference resource in the time domain.

14. The UE according to claim 12, wherein the CSI report is transmitted when a first CSI-RS transmission timing for a first CSI-RS resource in the CSI-RS resource set is earlier than the CSI reference resource in the time domain or is at the same time as the CSI reference resource, and wherein a second CSI-RS transmission timing for a second CSI-RS resource in the CSI-RS resource set is later than the CSI reference resource in the time domain; or the CSI report is transmitted when a first CSI-RS transmission timing for a first CSI-RS resource in the CSI-RS resource set is earlier than the CSI reference resource in the time domain or is at the same time as the CSI reference resource, and a second CSI-RS transmission timing for a second CSI-RS resource in the CSI-RS resource set is earlier than the CSI reference resource in the time domain or is at the same time as the CSI reference resource.

15. A base station BS, comprising: transceiver; and a processor coupled to the transceiver and configured to: transmitting, via the transceiver, configuration information indicating the number of CSI-RS resources in a channel state information-reference signal (CSI-RS) resource set as channel measurement resources; determining a first symbol associated with a first additional duration and a second symbol associated with a second additional duration; and receiving, via the transceiver, the CSI report when an uplink transmission carrying the CSI report is later than or coincident with the first symbol after the end of a last symbol of a physical downlink control channel (PDCCH) triggering the CSI report; and receiving the CSI report when the uplink transmission carrying the CSI report is later than the second symbol after the end of the last symbol of the aperiodic CSI-RS resources for channel measurement, the aperiodic channel measurement-interference measurement CSI-IM for interference measurement, and the aperiodic non-zero power NZP CSI-RS for interference measurement, or at the same time as the second symbol.

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