Channel state information feedback over multiple channel measurement resources or coherent joint transmissions

Abstract

The present disclosure provides methods and systems for wireless communication for channel state information (CSI) feedback over multiple channel measurement resources (CMRs) or coherent joint transmissions (CJTs). For example, a user equipment (UE) transmits to a network entity an indication of the ability to report CSI reports based on signals of multiple CMRs or multiple transmission / reception points (TRPs). The UE then receives a configuration message that configures the UE to determine the CSI report. The UE performs concurrent measurements of a plurality of CMRs and at least one interference measurement resource (IMR) for a plurality of time instances by the UE as configured according to a configuration message. The UE prepares a single CSI report reflecting a time domain variation of two or more of the plurality of CMRs based on the concurrent measurement. The UE transmits a single CSI report including the performed concurrent measurements to the network entity.

Description

Technical Field

[0001] The present disclosure generally relates to channel state information (CSI) feedback. Background Art

[0002] The 3rd Generation Partnership Project (3GPP) is currently in the process of specifying a new radio interface called 5G New Radio (5G NR) and the Next Generation Packet Core Network (NG-CN or NGC). The 5G NR architecture will have three components: 5G Radio Access Network (5G-RAN), 5G Core Network (5GC), and User Equipment (UE). To facilitate the implementation of different data services and requirements, 3GPP 5G NR cellular networks support network slicing, which enables the reuse of virtualized and independent logical networks on the same physical network infrastructure.

[0003] Channel state information (CSI) can be obtained from measurements based on a single CSI-RS instance or from the average of multiple CSI-RS instances. Such CSI cannot reflect the time domain variation of the channel. Such a CSI reporting mechanism may not work well for UEs with high / medium speeds, as a single CSI-RS instance may not provide enough information to determine the dynamic aspects of the channel conditions (e.g., UE moving at 30 km / h or more).

[0004] On the other hand, when multiple transmission / reception points (TRPs) are involved, configuring the CSI framework to support CSI reporting for coherent joint transmission (CJT) for multiple TRPs may face technical issues and challenges. Summary of the invention

[0005] The present disclosure provides a method for channel state information (CSI) feedback for a user equipment (UE) with high speed and medium speed, the method comprising: ● Control signaling to trigger multiple instances of aperiodic CSI-RS for CSI measurement ● Method for identifying time instances for CSI measurements ● Methods for determining LI and CQI reported in CSI

[0006] In addition, the present disclosure provides a method for CSI feedback for coherent joint transmission (CJT), the method comprising: ● CSI framework for CSI reporting for CJT operations ● CSI processing unit (CPU) occupancy rules and minimum processing latency for CSI reporting for CJT operations

[0007] Details of the described methods (and related systems and techniques) are discussed in detail below. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The described embodiments and advantages of the embodiments may be best understood by referring to the following description taken in conjunction with the accompanying drawings, which in no way limit any changes in form and detail that may be made to the described embodiments by one skilled in the art without departing from the spirit and scope of the described embodiments.

[0009] Figure 1 is a block diagram depicting an example framework for channel state information (CSI) according to some embodiments;

[0010] Figure 2 is an example of a CSI processing unit (CPU) occupancy rule depicting periodic or semi-persistent CSI reporting according to some embodiments;

[0011] Figure 3 is an example depicting CSI processing unit (CPU) occupancy rules for aperiodic CSI reporting according to some embodiments;

[0012] Figure 4 An example mechanism for a single CSI report for multiple CSI measurements for a high-speed or medium-speed UE according to some embodiments is shown;

[0013] Figure 5 is a flow chart depicting a method of wireless communication by a user equipment (UE) device according to some embodiments;

[0014] Figure 6 An example call flow diagram for enhancing aperiodic CSI feedback to support UE devices with high / medium speeds according to some embodiments is shown;

[0015] Figure 7 An example scheme with time domain interpolation according to some embodiments is shown;

[0016] Figure 8 is a flow chart depicting a method of wireless communication by a user equipment (UE) device according to some embodiments;

[0017] Fig. 9 is a flow chart depicting a method for a network entity to conduct wireless communications according to some embodiments;

[0018] Fig.10 An example call flow diagram illustrating enhancement of aperiodic and semi-persistent CSI feedback to support UE devices with high / medium speeds according to some embodiments is shown;

[0019] Fig.11 is an example depicting coherent joint transmission (CJT) according to some embodiments;

[0020] Fig.12is a flow chart depicting a method for CJT CSI reporting by a user equipment (UE) device according to some embodiments;

[0021] Fig.13 shows an example call flow diagram for CJT CSI reporting according to some embodiments;

[0022] Fig.14 is a flow chart depicting a method for CJT CSI reporting by a user equipment (UE) device according to some embodiments;

[0023] Fig.15 is a flow chart depicting a method for a network entity to perform CJT CSI reporting according to some embodiments;

[0024] Fig.16 shows an example of a CMR / IMR configuration and associated CSI framework for CJT-CSI reporting according to some embodiments;

[0025] Fig.17 shows an example of a CMR / IMR configuration and associated CSI framework for CJT-CSI reporting according to some embodiments;

[0026] Fig.18 shows an example of a CMR / IMR configuration and associated CSI framework for CJT-CSI reporting according to some embodiments;

[0027] Fig.19 An example of an aperiodic CSI triggering state configuration according to some embodiments is shown. DETAILED DESCRIPTION

[0028] For ease of illustration, the following techniques are described in an example context in which one or more UE devices and a RAN implement one or more radio access technologies (RATs), including at least the fifth generation (5G) new radio (NR) standard (e.g., third generation partnership project (3GPP) release 15, 3GPP release 16, etc.) (hereinafter referred to as "5G NR" or "5G NR standard"). However, the present disclosure is not limited to networks configured with 5G NR RATs, but the techniques described herein can be applied to any combination of different RATs employed at UE devices and RANs. In addition, the present disclosure is not limited to the examples and contexts described herein, but the techniques described herein can be applied to any network environment.

[0029] The present disclosure provides a method and system for wireless communication for channel state information (CSI) feedback on multiple channel measurement resources (CMRs) or coherent joint transmission (CJT). For example, a user equipment (UE) transmits an indication of the ability to report CSI reports based on signals of multiple CMRs or multiple transmission / reception points (TRPs) to a network entity. The UE then receives a configuration message that configures the UE to determine the CSI report. The UE performs concurrent measurements of multiple CMRs and at least one interference measurement resource (IMR) for multiple time instances by the UE as configured according to the configuration message. Based on the concurrent measurement, the UE prepares a single CSI report that reflects the time domain changes of two or more CMRs in the multiple CMRs. The UE transmits a single CSI report including the performed concurrent measurements to the network entity.

[0030] Figure 1 is a block diagram 100 depicting an example framework 100 of channel state information (CSI) according to some embodiments. For a multiple-input multiple-output (MIMO) system, channel state information (CSI) is key information for the gNB to select a digital precoder for a UE. Typically, the gNB may configure CSI reporting via RRC signaling CSI-ReportConfig, where a channel state information reference signal (CSI-RS) is used as a channel measurement resource (CMR) for the UE to measure the downlink channel. At the same time, the gNB may configure some interference measurement resources (IMRs) for the UE in CSI-ReportConfig to measure interference. A CMR (e.g., a resource configured in resourcesForChannelMeasurement) may be associated with a zero-power IMR (ZP-IMR) (e.g., a resource configured in csi-IM-ResourcesForInterference) and / or a non-zero-power IMR (NZP-IMR) (e.g., a resource configured in nzp-CSI-RS-ResourcesForInterference). In one example, NZP-IMR may be used for intra-cell interference measurement and ZP-IMR may be used for inter-cell interference measurement.For UEs with multi-beam operation, the UE should use the same beam to receive CMR and the associated IMR.

[0031] With the associated CMR and IMR, the UE is able to identify the CSI, which may include rank indicator (RI), precoder matrix indicator (PMI), channel quality indicator (CQI), and layer indicator (LI). RI and PMI are used to determine the digital precoder, CQI is used to reflect the signal to interference plus noise (SINR) status to assist the gNB in ​​determining the modulation coding scheme (MCS), and LI is used to identify the strongest layer, which helps in MU-MIMO pairing with low-rank transmission and precoder selection for phase tracking reference signal (PT-RS). For CSI-ReportConfig configured with more than 1 CMR, the UE can report the CSI-RS resource indicator (CRI) associated with the reported RI / PMI / CQI / LI to inform the gNB which CMR the CSI was measured from.

[0032] The gNB can configure the time domain behavior of CSI reporting, such as periodic / semi-persistent / aperiodic reporting, in CSI-ReportConfig. The gNB can activate or deactivate semi-persistent CSI reporting through MAC Control Element (CE). The gNB can trigger aperiodic CSI reporting through Downlink Control Information (DCI). The UE can report periodic CSI through PUCCH resources configured in CSI-ReportConfig. The UE can report semi-persistent CSI through PUCCH resources configured in CSI-ReportConfig or PUSCH resources triggered by the gNB through DCI. The UE can report aperiodic CSI through PUSCH resources triggered by the gNB through DCI.

[0033] For layer 1 related measurements, the following types of CSI-RS have been introduced since Rel-15:

[0034] The CSI-RS used for tracking is also called a Tracking Reference Signal (TRS). It is a set of CSI-RS resources configured with the RRC parameter TRS-Info. TRS is used for time / frequency offset tracking.

[0035] CSI-RS for beam management (BM): The CSI-RS for BM is configured in the CSI-RS resource set configured with the RRC parameter repetition.

[0036] CSI-RS for CSI acquisition. This is the CSI-RS used for CSI measurement and reporting. The CSI-RS for CSI acquisition is configured in the CSI-RS resource set for which the RRC parameters TRS-Info and repetition are not configured.

[0037] In the present disclosure, unless otherwise specified, CSI-RS indicates a CSI-RS used for CSI acquisition.

[0038] Since Rel-15, the Type 2 CSI codebook for CSI reporting has been introduced for UE to measure and report CSI, where the precoder is quantized as follows:

[0039] in, The dimension is N Tx Multiply by 2L wideband precoder; is a subband precoder of dimension 2L times v; L indicates the number of beams and v indicates the number of layers, which is RI+1.

[0040] can be quantized based on the codebook, and can be quantized based on the power and angle of each element, which may result in large overhead because is based on subbands, and there may be multiple subbands for CSI reporting, which is determined by the bandwidth of the CSI-RS. In one example, the codebook for W1 selection can be defined as follows:

[0041] in, Represents the Kronecker product; L indicates the number of beams configured by RRC signaling; N1, N2, O1, and O2 are related to the number of ports and oversampling factors configured by RRC signaling in the horizontal and vertical domains, and the candidate value should be determined based on the number of CSI-RS ports. The codebook contains precoders with different values ​​of m and n. In one example, the candidate values ​​are defined as Table 5.2.2.2.1-2 in 38.214.

[0042] In Rel-16, an enhanced Type 2 codebook for CSI reporting of TRP is introduced, where the precoder can be quantized as follows:

[0043] in, Same as Rel-15 Type2 codebook, it is used to provide spatial domain basis (SD-basis); indicates the wideband beam combining weights of dimension 2L times M, and Indicates a frequency domain basis (FD-basis) of dimension N3 times M, where N3 is the number of subbands and can be derived by the RRC parameter numberOfPMI-SubbandsPerCQI-Subband, and M can be derived by RRC signaling numberOfPMI-SubbandsPerCQI-Subband and paramCombination. Details can be found in section 5.2.2.2.5 of 38.214.

[0044] The UE may be configured with multiple CSI-ReportConfigs for multiple CSI measurements and reports. Regarding multiple parallel CSI measurement and reporting processes, CSI processing units (CPUs) have been introduced since Rel-15. The UE may report how many CPUs it supports, and if the scheduling of the gNB results in more parallel CSI processing than the supported number of CPUs, the UE may report outdated CSI for low priority CSI reporting, where the priority is calculated according to section 5.2.5 in 38.214. The CPU occupancy rules for periodic / semi-persistent / aperiodic CSI reporting are defined as follows [38.214, section 5.2.1.6].

[0045] Figure 2 is an example depicting the CSI processing unit (CPU) occupancy rules for periodic or semi-persistent CSI reporting. Figure 3 is an example depicting the CSI processing unit (CPU) occupancy rule for aperiodic CSI reporting. Periodic or semi-persistent CSI reporting (excluding the initial semi-persistent CSI report on PUSCH after a PDCCH triggered report) occupies the CPU from the first symbol of the earliest one of each CSI-RS / CSI-IM / SSB resource used for channel or interference measurement - the corresponding latest CSI-RS / CSI-IM / SSB timing not later than the corresponding CSI reference resource, until the last symbol of the configured PUSCH / PUCCH carrying the report.

[0046] Aperiodic CSI reporting occupies the CPU from the first symbol after the PDCCH triggers the CSI report until the last symbol of the scheduled PUSCH carrying the report. When PDCCH reception includes two PDCCH candidates from two corresponding search space sets, as described in clause 10.1 of [6, TS 38.213], for determining the CPU occupancy duration, the PDCCH candidate that ends later in time is used.

[0047] The initial semi-persistent CSI report on PUSCH after a PDCCH trigger occupies the CPU from the first symbol after the PDCCH until the last symbol of the scheduled PUSCH carrying the report. When a PDCCH reception includes two PDCCH candidates from two corresponding search space sets, as described in clause 10.1 of [6, TS 38.213], for determining the CPU occupancy duration, the PDCCH candidate that ends later in time is used.

[0048] Additionally, two minimum processing delays for CSI reporting are defined as follows, where the scheduling of CSI reporting should follow the minimum processing delays Z and Z'. Candidate values ​​for Z and Z' for different types of CSI reporting are defined in section 5.4 of 38.214. If the scheduling offset does not follow the minimum Z and Z', the UE may report outdated CSI, or if there are no other signals such as data and HARQ-ACK to be transmitted on the PUSCH triggered by the DCI, the UE may ignore the DCI.

[0049] When the CSI request field on the DCI triggers a CSI report on the PUSCH, the UE shall provide a valid CSI report for the nth triggered report. ● If the first uplink symbol used to carry the corresponding CSI report (including the effect of timing advance) is not earlier than symbol Z ref Start, and ● If the first uplink symbol used to carry the nth CSI report (including the effect of timing advance) is not earlier than symbol Z' ref (n),

[0050] Figure 4 An example mechanism 400 for a single CSI report of multiple CSI measurements for high or medium speed UEs according to some embodiments is shown. CSI enhancement for UEs with high / medium speeds, such as UEs with a mobile speed above 30 km / h (or a threshold speed) relative to a network entity (e.g., BS), may be used, where the UE may perform measurements on multiple CMR instances and report CSI based on the measurements as shown.

[0051] Since the UE's position does not change in a short time, such as several time slots, the SD / FD basis does not change, and only the beam combining weights change. For CMR instance t, the UE can select the precoder as

[0052] For t -N4+1 ,t -N4+2The selected precoder for the N4 CMR instances at t0, ..., t1 can be expressed as follows:

[0053] Then the precoder W can be compressed as follows

[0054] Where W td indicates a matrix with dimensions N4 times T and having T time domain bases (TD bases); Indicates the new beam combining weights for N4 CMR instances of dimension 2L times M*T. The TD basis can also be expressed as a Doppler domain basis (DD basis).

[0055] For CSI measurement at high / medium speed, the first issue is about the control signaling for triggering multiple instances of aperiodic CSI-RS when CMR is configured as CMR for CSI feedback. The second issue is how to maintain the same understanding between gNB and UE about the time instance of CSI feedback. The third issue is how to calculate other CSI components such as LI, CQI based on the precoder and channel measured for multiple instances.

[0056] Figure 5 is a flowchart depicting a method 500 for wireless communication by a user equipment (UE) device according to some embodiments. The method is performed by processing logic, which includes hardware (e.g., circuit system, dedicated logic, programmable logic, processor, processing device, central processing unit (CPU), system on chip (SoC), etc.), software (e.g., instructions and / or applications running / executed on a processing device), firmware (e.g., microcode), or a combination thereof. The method of flowchart 500 is performed by a UE device. A network entity may include one or more radio frequency (RF) modems, a processor coupled to the one or more RF modems, and at least one non-transitory memory storing executable instructions for manipulating at least one of the processor or the RF modem to perform the method of flowchart 500. The network entity may perform complementary methods to interact with the UE device performing method 500 (see Figure 6 Flowchart in the call flow diagram).

[0057] refer to Figure 5, the method illustrates example functions used by various embodiments. Although specific functional blocks ("boxes") are disclosed in the method, such boxes are examples. That is, the embodiments are well suited to performing various other boxes or variations of boxes listed in the method. It should be understood that the boxes in the method can be executed in an order different from the order presented, and not all boxes in the method can be executed.

[0058] like Figure 5 As shown, the method includes block 510: transmitting, by a UE device to a network entity, an indication of the ability to report channel state information (CSI) reports based on signals of multiple channel measurement resources (CMRs) or multiple transmission / reception points (TRPs) of the network entity.

[0059] The method includes block 520 of receiving a configuration message from a network entity acting in response to an indication transmitted by a UE device, the configuration message configuring the UE device to determine a CSI report.

[0060] The method includes block 530 of performing, by the UE device as configured according to the configuration message, concurrent measurements of a plurality of CMRs and at least one interference measurement resource (IMR) for a plurality of time instances.

[0061] The method includes block 540 of preparing, based on the concurrent measurement, a single CSI report reflecting time domain variations of two or more CMRs of the plurality of CMRs.

[0062] The method includes block 550 of transmitting a single CSI report including the performed concurrent measurements to a network entity.

[0063] In some aspects, the method 500 further includes: decoding multiple instances of a CSI reference signal (CSI-RS) using a codebook configured for CSI measurement based on a configuration message from a network entity, the multiple instances of the CSI-RS including one or more of the following: CMR, IMR, and a time instance for CSI measurement. The method 500 may also include: obtaining a precoder value based on at least a layer indicator (LI) or a channel quality indicator (CQI) corresponding to each CMR of two or more of the multiple CMRs and at least one IMR; and transmitting a CSI report to the network entity, the CSI report including the precoder and one or both of the LI and the CQI.

[0064] In some embodiments, the method 500 may include performing concurrent measurements on multiple CMRs and at least one IMR at multiple time instances. The method may include: when the UE device exceeds a threshold speed, determining or generating a single CSI report reflecting the time domain variation of each of two or more of the multiple CMRs. The UE device transmits the single CSI report to a network entity.

[0065] In some embodiments, the configuration message comprises at least one of: a radio resource control (RRC) message; a medium access control (MAC) control element (MAC CE); or downlink control information (DCI). The multiple instances of CSI-RS include aperiodic or semi-persistent CSI-RS.

[0066] In some embodiments, the indication of the ability to report CSI reports includes any of the following: the maximum number of CSI-RS resource instances that the UE device can measure for CSI reporting; the number of CSI processing units (CPUs) occupied for CSI-RS with multiple instances; an upper limit on the number of information elements (IEs) configured for CSI reporting; the minimum processing delay for CSI reports; and whether CSI prediction for CSI measurements based on virtual CMR instances is supported.

[0067] In some embodiments, the method 500 may further include receiving downlink control information (DCI) for triggering a plurality of CMRs and at least one IMR from a network entity, the plurality of CMRs including a plurality of instances of a CSI-RS.

[0068] In some embodiments, the UE device may obtain the precoder by: identifying an instance of the CSI-RS as a CMR; and performing CSI measurement on the instance of the CSI-RS.

[0069] In some embodiments, the configuration message may include: indicating the number of multiple instances of CSI-RS used in the CSI report; the number of time domain bases; and a scheme for CSI measurement. The scheme for CSI measurement may include a scheme based on multiple virtual CMRs and multiple physical CMRs measured before the minimum processing delay of the CSI report.

[0070] In some cases, method 500 may further include transmitting a CSI report to a network entity, the CSI report including multiple measurements of LI and CQI based on: (1) a CMR with the most energy among a plurality of CMRs or a CMR with the least energy among a plurality of CMRs; (2) corresponding performance of one or more CMRs among a plurality of CMRs; (3) a precoder; (4) a minimum value and a maximum value of CQI; or (5) a correspondence with a first instance and a last instance of a plurality of CMRs. In some cases, a codebook is used to decode an aperiodic CSI-RS that is used by a UE device to report a CSI report when the UE device is traveling at a speed not less than a threshold speed relative to the network entity.

[0071] Figure 6An example call flow diagram 600 for enhanced aperiodic CSI feedback to support UE devices with high / medium speeds in accordance with some embodiments is shown. Initially, the UE may report to the gNB one or more capabilities indicating support for enhanced aperiodic CSI feedback, such as a maximum number of instances of aperiodic CSI-RS resources that the UE may measure for enhanced CSI feedback. In some embodiments, the gNB may receive the one or more capabilities from a core network (e.g., an access and mobility management function (AMF)) or another gNB. After receiving the capabilities, the gNB may send an RRC message (e.g., an RRCReconfiguration message or an RRCResume message) to the UE, the RRC message including a configuration to enable enhanced aperiodic CSI feedback. In some implementations, the gNB may include the configuration in a CSI-ReportConfigReportConfig IE and include the CSI-ReportConfig IE in the RRC message. After transmitting the configuration to the UE, the gNB may transmit a DCI to the UE to trigger multiple instances of an aperiodic CSI-RS configured as a CMR. The UE may then perform measurements on multiple instances of the aperiodic CSI-RS. The UE obtains or derives a channel estimate and / or a signal-to-interference-plus-noise (SINR) ratio from the measurements. The UE selects a precoder matrix W (i.e., a component of the CSI) and selects other components of the CSI, such as LI and CQI, based on the selected precoder matrix and the channel estimate. Finally, the UE reports the CSI (i.e., the components described above) to the gNB, and the gNB performs CSI decoding.

[0072] In an embodiment, the one or more capabilities include at least one of the following capabilities: 1) the maximum number of instances of aperiodic CSI-RS resources that a UE can measure and obtain CSI for enhanced aperiodic CSI feedback, 2) Maximum number of CSI-ReportConfigReportConfig IEs with aperiodic CSI-RS, 3) the number of CPUs occupied for aperiodic CSI-RS with multiple instances, and 4) For CSI reporting based on aperiodic CSI-RS with multiple instances, the minimum processing delay defined by parameters Z and Z', 5) Whether CSI prediction is supported, such as CSI measurement based on virtual CMR instances.

[0073] Each, some or all of the one or more capabilities described above may be defined or specified per bandwidth part (BWP), per frequency band, per frequency band combination, or per component carrier (CC) or across CCs in a frequency band combination.

[0074] In an embodiment, the configuration of enhanced aperiodic CSI feedback or CSI-ReportConfig may include a new codebook configuration for the codebook CSI-ReportConfig. The new codebook configuration may include at least one of the following configuration parameters: ● Number of beams (L) ● The number of ports in the horizontal and vertical domains (N1, N2) ● The amount of oversampling factors in the horizontal and vertical domain (O1, O2) ● Number of subbands per CQI calculation, which indicates the number of CSI compressed subbands used for CQI calculation ● RI restriction, which is used to indicate the candidate loss factors for precoder selection. ● The number of CMR instances used for CSI reporting, which indicates the value of N4 ● The number of time domain bases, which indicates the value of T ● CSI measurement solution

[0075] In some implementations, the number of CMR instances may be determined based on the number of triggered aperiodic CSI-RS instances configured as CMRs. For example, if the gNB triggers N4 aperiodic CSI-RS instances, the number of CMR instances is N4. Details on triggering more than 1 instance of aperiodic CSI-RS will be shown in the next embodiment. Therefore, for CSI reporting based on aperiodic CSI-RS, RRC parameters regarding the number of CMR instances may not be provided.

[0076] In some implementations, regarding the dynamic switching between the legacy codebook and the new codebook for enhanced aperiodic CSI feedback, in some implementations, the gNB may dynamically update or configure the number of instances (N4) through L1 or L2 signaling (e.g., MAC CE or DCI). For example, the gNB includes the N4 value in the configuration of the enhanced aperiodic CSI feedback (i.e., RRC configuration), and transmits a MAC CE or DCI including a new N4 value to the UE to update the N4 value configured in the RRC configuration. In another example, the gNB transmits a MAC CE or DCI including the N4 value to the UE instead of transmitting an RRC message including N4 to the UE. In this example, the configuration of the enhanced aperiodic CSI feedback does not include the number of instances (N4).

[0077] In some other implementations, the number of instances (N4) may be reported by the UE to the gNB. In one implementation, the UE determines a number of instances that is less than or equal to the number of instances configured by the gNB. In one example, in the CSI report, the UE may include a value of N4 and a CSI component based on the reported N4. If the UE uses the long PUCCH format or PUSCH to transmit the CSI report, the UE includes the N4 value in CSI Part 1 in the CSI report. If the UE uses the short PUCCH format to transmit the CSI report, the UE may not include the N4 value in the CSI report. Table 1 shows an example of CSI Part 1 in a CSI report. In some embodiments, the UE includes the value of N4 in CSI Part 2 in the CSI report. Table 1: An example of a CSI report with the number of instances

[0078] The “CSI measurement scheme” may configure the UE to select one of the following schemes to identify the N4 time instances for CSI reporting.

[0079] Option 1: The reported CSI should be measured based on N4 instances of the CMR before the minimum processing delay of the CSI report

[0080] Solution 2: The reported CSI should be measured based on the virtual N4 CMR instances and the actual CMR before the minimum processing delay of the CSI report

[0081] Figure 7 An example scheme 700 with time domain interpolation according to some embodiments is shown. For scheme 2, the UE needs to apply time domain interpolation as shown. Some additional parameters may be predefined or configured via RRC signaling in CSI-ReportConfig as follows.

[0082] The starting offset of the first virtual CMR instance for CSI measurement, which is used to indicate the time domain position of the starting CMR instance with reference to the first or last symbol of the CSI report.

[0083] The interval between virtual CMR instances used for CSI measurement, which is used to indicate the interval between each virtual CMR instance

[0084] The number of actual CMR instances used for CSI measurement, which is used to indicate the actual CMR instances used for CSI measurement before time domain interpolation.

[0085] In one example, the starting offset of the virtual CMR instance may be predefined as X time slots after the time slot with the CSI report or the first / last symbol of the CSI report. The virtual CMR interval may be predefined as X time slots. The value of X may be the same as the interval of the actual CMR. The number of actual CMR instances may be the same as the number of instances of triggered aperiodic CSI-RS for CSI measurement. In some other implementations, the CSI measurement scheme selected for the CMR instance may be reported by the UE. In one example, in the CSI report, the UE may report the CSI measurement scheme selected for the CMR instance.

[0086] In an embodiment, the gNB may trigger multiple instances of aperiodic CSI-RS via a DCI of, for example, DCI format 0_1 ​​or 0_2.

[0087] In one implementation, for CSI-RS resources, the gNB may configure the number of instances and the interval between two consecutive instances through RRC signaling, RRC parameters in NZP-CSI-RS-Resource. Then, when such CSI-RS resources are triggered by DCI, such as through the DCI field CSI request, the gNB may transmit CSI-RS in the configured instances, where the time domain position of the first instance is configured through RRC signaling. In one example, the following RRC parameters nrofInstances and instanceInterval may be introduced to provide multi-instance aperiodic CSI-RS configuration.

[0088] In another implementation, the gNB may trigger multiple instances of CSI-RS by triggering a set of CSI-RS with the same configured CSI-RS resources through DCI, such as the DCI field CSI request. In the CSI-RS resource set, an RRC parameter may be introduced to indicate that the CSI-RS are from the same port and / or another RRC parameter may be introduced to provide an interval between two CSI-RS resources. In one example, the following RRC parameters samePort and instanceInterval may be introduced to provide multi-instance aperiodic CSI-RS configuration. For the CSI-RS resources in a resource set, other RRC parameters except nzp-CSI-ResourceId should be the same, or the RRC parameters configured for the CSI-RS resource with the smallest ID should be applied to all CSI-RS resources in the resource set.

[0089] In another implementation, the gNB may configure the number of instances of the triggered aperiodic CSI-RS resource and / or the interval between two consecutive instances through the DCI for triggering the aperiodic CSI-RS resource. In one example, a field number of instance may be introduced in the DCI. In another example, a field interval between two consecutive instances for a CSI-RS may be introduced in the DCI.

[0090] In an embodiment, after receiving the signaling for triggering CSI reporting for high / medium UE speed, the UE may select the precoder for the target time instance as follows

[0091] In one implementation, the UE may measure and report the LI / CQI corresponding to a CMR instance. The UE may report the LI / CQI based on the precoder of the first or last CMR instance. In some embodiments, the UE may report the LI / CQI based on the CMR instance closest to the CSI report or IMR. In some embodiments, the UE may report the LI / CQI based on the CMR instance with the best or worst energy / performance among the CMR instances. In some embodiments, the CMR instance may be configured by the gNB based on RRC signaling, MAC CE, or DCI. In some embodiments, the CMR instance index used to derive the LI / CQI may be reported by the UE in the CSI report. The CMR instance may be an actual CMR instance or a virtual CMR instance.

[0092] In another implementation, the UE may measure and report multiple LI / CQIs corresponding to multiple CMR instances. The UE may report the LI / CQI based on the precoder of each CMR instance. In some embodiments, the UE may report two LI / CQIs based on the CMR instance, which represent the minimum CQI and the maximum CQI measured among the CMR instances, and the LI measured from these CMR instances. In some embodiments, the UE may report two LI / CQIs corresponding to the first and last CMR instances, respectively. The CMR instance may be an actual CMR instance or a virtual CMR instance.

[0093] In another implementation, the UE may measure and report the LI / CQI based on the average precoder and channel among multiple CMR instances. The CMR instance used for LI / CQI selection may be the same as the CMR instance used for precoder calculation. In some embodiments, the CMR instance used for LI / CQI selection may be configured through RRC signaling, for example, RRC parameters in CSI-ReportConfig, or MAC CE, or DCI.

[0094] Figure 8 is a flow chart illustrating a method 800 of a user equipment (UE) device performing wireless communications, according to some embodiments. Fig. 9 is a flow chart depicting a method 900 for wireless communication by a network entity complementary to the method 800 according to some embodiments. In some implementations, the gNB determines whether to configure enhanced aperiodic CSI feedback for a UE based on whether one or more capabilities indicating support for enhanced aperiodic CSI feedback are received. If the gNB receives one or more capabilities from the UE indicating support for enhanced aperiodic CSI feedback, the gNB transmits control signaling (e.g., an RRC message such as an RRCReconfiguration message or an RRCResume message) to the UE to configure enhanced aperiodic CSI feedback. Otherwise, if the gNB determines that the UE does not support enhanced aperiodic CSI feedback, the gNB avoids configuring enhanced aperiodic CSI feedback for the UE. That is, the gNB avoids transmitting control signaling to the UE to configure enhanced aperiodic CSI feedback. In this case, the gNB may transmit control signaling (e.g., an RRC message such as an RRCReconfiguration message or an RRCResume message) to the UE to configure conventional aperiodic CSI feedback. After configuring conventional aperiodic CSI feedback for the UE, the gNB may transmit CSI report trigger signaling (e.g., MAC CE or DCI) to the UE to trigger conventional aperiodic CSI feedback.

[0095] In some further implementations, if the gNB determines that the UE supports enhanced aperiodic CSI feedback based on one or more capabilities indicating support for enhanced aperiodic CSI feedback, the gNB may determine whether to configure enhanced aperiodic CSI feedback for the UE based on the mobility state of the UE. The gNB communicates with a UE operating in a connected state (e.g., an RRC_CONNECTE state). If the gNB determines that the UE is in a high or medium mobility state, the gNB transmits control signaling (e.g., an RRC message such as an RRCReconfiguration message or an RRCResume message) to the UE to configure enhanced aperiodic CSI feedback for the UE. Otherwise, if the gNB determines that the UE is in a low mobility state, the gNB avoids configuring enhanced aperiodic CSI feedback for the UE. That is, the gNB avoids transmitting control signaling to configure enhanced aperiodic CSI feedback to the UE. In some implementations, if the gNB determines that the UE is in a low mobility state, the gNB may transmit control signaling (e.g., an RRC message such as an RRCReconfiguration message or an RRCResume message) to configure conventional aperiodic CSI feedback to the UE.

[0096] In some embodiments, regardless of the mobility state of the UE, the gNB may transmit control signaling (e.g., an RRC message such as an RRCReconfiguration message or an RRCResume message) to the UE to configure conventional aperiodic CSI feedback. After configuring conventional CSI feedback for the UE, the gNB may transmit a CSI report triggering signal to the UE to trigger conventional aperiodic CSI feedback.

[0097] In other implementations, as described above, regardless of the mobility state of the UE, the gNB determines to configure enhanced aperiodic CSI feedback for the UE based on one or more capabilities indicating support for enhanced aperiodic CSI feedback. The gNB communicates with a UE operating in a connected state (e.g., RRC_CONNECTE state). If the gNB determines that the UE is in a high or medium mobility state, the gNB transmits CSI report trigger signaling and CMR / IMR to the UE. Otherwise, if the gNB determines that the UE is in a low mobility state, the gNB avoids transmitting CSI report trigger signaling and CMR / IMR to the UE. In some implementations, the gNB may configure traditional aperiodic CSI feedback for the UE as described above. After configuring traditional CSI feedback for the UE, the gNB may transmit a CSI report trigger signal to the UE to trigger traditional aperiodic CSI feedback.

[0098] In some implementations, the gNB may determine the mobility state of the UE based on a sounding reference signal received from the UE. In other implementations, the gNB may determine the mobility state of the UE based on a Doppler effect (e.g., Doppler shift and / or Doppler spread) report received from the UE. In yet other implementations, the gNB may determine the mobility state of the UE based on a mobility state report received from the UE. For example, the gNB may transmit a message to the UE to configure the UE to report the mobility state. In one implementation, the message may be an RRCReconfiguration message, an RRCResume message, or a MAC CE. In response to the message, the UE transmits a mobility state report including the mobility state of the UE to the gNB. In one implementation, the mobility state report may be an RRC message (e.g., a UEAssistanceInformation message) or a MAC CE. In some implementations, the mobility state report may include a mobility state (e.g., high, medium, or low) and / or a speed. In some implementations, the gNB may include one or more thresholds in the message. The UE uses the one or more thresholds to determine the mobility state (eg, high, medium, or low).

[0099] Fig.10 An example call flow diagram 1000 is shown for enhancing aperiodic and semi-persistent CSI feedback to support UE devices with high / medium speeds according to some embodiments. For example, the call flow diagram shows a general process for CSI feedback for high / medium UE speeds based on periodic / semi-persistent CSI-RS. Figure 6 Compared with the process in , the differences are as follows.

[0100] In the UE capability report, the UE may report whether it supports CSI feedback for high / medium UE speeds based on periodic / semi-persistent CSI-RS, as well as the maximum number of periodic / semi-persistent CSI-RS resources, the maximum number of instances, the maximum number of CSI reporting configurations for periodic / semi-persistent CSI, and / or the maximum number of periodic / semi-persistent CSI reports.

[0101] In the control signaling of the CSI framework for CSI reporting, the gNB may only need to configure the number of instances (N4) and / or the CSI reporting scheme. The interval between two consecutive instances may be derived based on the periodicity of the periodic / semi-persistent CSI-RS.

[0102] Some or all instances of CSI-RS configured as CMRs may be transmitted prior to control signaling for triggering CSI reporting.

[0103] The signaling for triggering semi-persistent CSI reporting may be a MAC CE. In some implementations, the number of instances (N4) may be indicated by a MAC CE.

[0104] In the present disclosure, unless otherwise specified, RRC signaling may indicate an RRC reconfiguration message from the gNB to the UE, or a system information block (SIB), where the SIB may be an existing SIB (e.g., SIB1) or a new SIB transmitted by the gNB. In addition, the gNB may obtain the UE capabilities via UE capability report signaling or from the core network (e.g., access and mobility management function (AMF)).

[0105] In addition, in the present disclosure, the described solutions are based on 5G NR technology. It should be understood that the solutions can be applied to other wireless technologies such as 6G. "gNB" can be summarized as a base station or a radio access network (RAN) node.

[0106] Fig.11 1 is an example 1100 illustrating coherent joint transmission (CJT) according to some embodiments. As shown, the UE can operate from up to N TRP ——For example, N TRP =4——4 transmission and reception points (TRP) receive downlink signals. For CJT, cross-TRP antenna combination can be applied. In one example, the precoder of the PDSCH transmission layer can be generated as ,in Indicates the antenna combination factor of TRPk and indicates the Precoder.

[0107] Since Rel-15, the Type 2 CSI codebook for TRP CSI reporting has been introduced for UE to measure and report CSI, where the precoder is quantized as follows:

[0108] in, The dimension is N Tx Multiply by 2L wideband precoder; is a subband precoder of dimension 2L times v; L indicates the number of beams and v indicates the number of layers, which is RI+1.

[0109] can be quantized based on the codebook, and can be quantized based on the power and angle of each element, which may result in large overhead because is based on subbands, and there may be multiple subbands for CSI reporting, which is determined by the bandwidth of the CSI-RS. In one example, the codebook for W1 selection can be defined as follows:

[0110] in, represents the Kronecker product; L indicates the number of beams configured by RRC signaling; N1, N2, O1, and O2 are related to the number of ports and oversampling factors configured by RRC signaling in the horizontal and vertical domains, and the candidate values ​​should be determined based on the number of CSI-RS ports. The codebook contains precoders with different values ​​of m and n. In one example, the candidate values ​​are defined as Table 5.2.2.2.1-2 in 3GPP specification 38.214.

[0111] In Rel-16, an enhanced Type 2 codebook for CSI reporting of TRP is introduced, where the precoder can be quantized as follows:

[0112] in, indicates wideband beam combining weights of dimension 2L times M; and Indicates a frequency domain basis of dimension N3 times M, where N3 is the number of subbands and can be derived by the RRC parameter numberOfPMI-SubbandsPerCQI-Subband, and M can be derived by RRC signaling numberOfPMI-SubbandsPerCQI-Subband and paramCombination. Details can be found in section 5.2.2.2.5 of 3GPP specification 38.214.

[0113] One possible way to perform CSI feedback for CJT is to report the quantized CSI as ,in Indicates the quantized precoder of TRP k. In some embodiments, another possible approach is to extend the current codebook for multi-TRP operation by considering beams from multiple TRPs. Thus, the dimension of each weight can be defined as The dimension is N TRP *N Tx Multiply by N TRP *2L wideband precoder, Indicates the dimension is N TRP *2L times the wideband beam combining weight of M.

[0114] Regardless of the quantization scheme used, how to configure the CSI framework to support CSI feedback for CJT may be an issue, such as CMR / IMR configuration and association, CSI-RS configuration, and UE behavior for CMR / IMR measurement and CSI-RS reception. The CSI framework should also support TRP selection. A second issue may be how to define UE behavior for CJT CSI measurement, such as CPU occupancy rules and minimum processing delay for CJT CSI measurement and reporting.

[0115] Fig.12 1200 is a flowchart depicting a method for CJT CSI reporting by a user equipment (UE) device according to some embodiments. The method is performed by processing logic, which includes hardware (e.g., circuit system, dedicated logic, programmable logic, processor, processing device, central processing unit (CPU), system on chip (SoC), etc.), software (e.g., instructions and / or applications running / executed on a processing device), firmware (e.g., microcode), or a combination thereof. The method of flowchart 1200 is performed by a UE device. A network entity may include one or more radio frequency (RF) modems, a processor coupled to the one or more RF modems, and at least one non-transitory memory storing executable instructions for manipulating at least one of the processor or the RF modem to perform the method of flowchart 1200. The network entity may perform complementary methods to interact with the UE device performing method 1200 (see Figure 3 Flowchart in the call flow diagram).

[0116] refer to Fig.12 , the method illustrates example functions used by various embodiments. Although specific functional blocks ("boxes") are disclosed in the method, such boxes are examples. That is, the embodiments are well suited to performing various other boxes or variations of boxes listed in the method. It should be understood that the boxes in the method can be executed in an order different from the order presented, and not all boxes in the method can be executed.

[0117] like Fig.12 As shown in, method 1200 includes box 1210: based on a configuration message from a network entity, determining a configuration of the UE device, which is used to include coherent joint transmission channel state information (CJT-CSI) in a CSI report, wherein the CJT-CSI includes CSI measurements of signals from multiple TRPs coherently combined at the UE device through joint antenna precoding at the multiple TRPs.

[0118] The method 1200 includes block 1220 of receiving a plurality of CMRs from a plurality of TRPs and at least one IMR associated with a CMR in the plurality of CMRs.

[0119] The method 1200 includes block 1230 of measuring CJT-CSI based on a plurality of CMRs and at least one IMR.

[0120] The method 1200 includes block 1240 of transmitting a CSI report including one or more indexes corresponding to a plurality of CMRs to a plurality of TRPs.

[0121] In some embodiments, the configuration message comprises at least one of: a radio resource control (RRC) reconfiguration message; or a system information block (SIB).

[0122] In some embodiments, for each component carrier (CC), each bandwidth part (BWP), each frequency band, each frequency band configuration, or each UE device in a group of UE devices including the UE device, an indication of the ability to report CSI reports includes any one of: the maximum number of TRPs supported by the UE device for CSI reporting of CJT-CSI; the maximum number of CMRs per configuration message for CJT-CSI; the maximum number of antenna ports for each CMR in multiple CMRs; the maximum number of total number of antenna ports for multiple CMRs across CSI reports; the maximum number of CMRs across multiple configuration messages (of CSI-reportConfig); and the maximum number of multiple configuration messages.

[0123] In some embodiments, the plurality of CMRs include one or more groups of CMRs across a plurality of TRPs, the one or more groups of CMRs being configured via a configuration message, and the CSI report includes an index identifying a group of CMRs in the one or more groups of CMRs.

[0124] In some embodiments, the CSI report further includes at least one of: a rank indicator (RI); a precoder matrix indicator (PMI); a channel quality indicator (CQI); a layer indicator; or one or more CSI-RS resource indicators (CRI).

[0125] In some embodiments, the UE device may perform concurrent measurements by: measuring CJT-CSI when a CSI processing unit (CPU) at the UE device is available for processing multiple CMRs, wherein the CPU at the UE device is configured based on the total number of one or more groups of CMRs. For example, the UE device may determine that a trigger to include CJT-CSI in a CSI report requires a number of CPUs that exceeds a maximum number of CPUs included in an indication of the ability to report CSI reports; and discard the trigger or determine that the trigger corresponds to an erroneous request from a network entity.

[0126] In some embodiments, the UE device may run multiple CPUs to perform multiple CJT-CST measurements in parallel for inclusion in the CSI report; wherein the number of the multiple CPUs dictates the maximum number of CJT-CSI measurements that the UE device can perform in parallel.

[0127] In some embodiments, the at least one IMR includes one or more of a zero power IMR (ZP-IMR) and a non-zero power IMR (NZP-IMR), and wherein the at least one IMR is associated with a set of CMRs in the one or more sets of CMRs.

[0128] The method 1200 may further include: measuring at least one IMR using a plurality of receive beams at the UE device; or measuring at least one IMR across two or more CMRs in a group of CMRs in the one or more groups of CMRs.

[0129] Fig.13 An example call flow diagram 1300 of CJT CSI reporting according to some embodiments is shown. As shown, the call flow diagram 1300 shows the general process of CJT-based CSI (CJT-CSI) reporting. The UE may perform CJT-CSI measurement and reporting based on one, some, or all of the following capabilities of CJT-CSI measurement and / or reporting: ● Maximum number of TRPs that a UE can support for CJT-CSI reporting ● The maximum number of CJI-CSI reports of reference signals that the UE can measure and process simultaneously, for which this capability is provided. ● Minimum processing delay for CJT-CSI measurement and reporting

[0130] In some implementations, each, some, or all of the capabilities may be defined or specified per CC per band combination supported by the UE. Each, some, or all of the one or more capabilities of each CC in the CCs in the band combination supported by the UE may be the same or different. Each, some, or all of the capabilities of CCs in different band combinations supported by the UE may be the same or different.

[0131] In other implementations, each, some, or all of the capabilities may be defined or specified per frequency band combination supported by the UE. Each, some, or all of the capabilities of different frequency band combinations supported by the UE may be the same or different. In some implementations, the frequency band combination may be an intra-band continuous frequency band combination, an intra-band non-contiguous frequency band combination, or an inter-band frequency band combination.

[0132] In yet other implementations, each, some or all of the capabilities may be defined or specified per frequency band supported by the UE.The capability (each or some) of the frequency bands supported by the UE may be the same or different.

[0133] In yet other implementations, each, some, or all of the capabilities may be defined or specified per frequency range (FR) supported by the UE. Each, some, or all of the one or more capabilities of the FRs (eg, FR1 and FR2) supported by the UE may be the same or different.

[0134] In yet other implementations, each, some, or all of the capabilities may be defined or specified per UE, ie, regardless of CC, band combination, band, and FR.

[0135] In some implementations, the UE may transmit one, some, or all of the capabilities to the gNB. In one implementation, the UE transmits a UE capability information message (e.g., a UECapabilityInformation message) including multiple UE capabilities (e.g., UE-NR-Capability IE) of the UE to the gNB, the multiple UE capabilities including one, some, or all of the capabilities. The gNB may transmit the multiple UE capabilities to a core network (CN) (e.g., an access and mobility function (AMF)), and the CN stores the multiple UE capabilities of the UE. In another implementation, the UE uses a capability ID to identify multiple UE capabilities that have been pre-stored in the CN. The UE transmits a non-access stratum (NAS) message including the capability ID to the CN via the gNB. Using any of the above implementations, when the UE next connects to the gNB, the gNB may receive the multiple UE capabilities from the CN without requesting the UE to transmit the multiple UE capabilities. In other implementations, one, some, or all of the capabilities for CJT-CSI measurement and / or reporting may be predefined in the 3GPP specification without the UE transmitting the capability / capabilities to the gNB or CN.

[0136] Based on the capability / capabilities of CJT-CSI measurement and / or reporting, the gNB may configure the UE to perform CJT-CSI measurement and reporting. In some implementations, the gNB transmits an RRC message (e.g., an RRCReconfiguration message or an RRCResume message) including a CSI-reportConfig IE to the UE, wherein each IE may configure a CMR, at least one IMR to be associated with each of the CMRs used for CJT-CSI measurement, and a configuration of uplink resources, such as PUCCH or PUSCH, for CJT-CSI reporting. In some implementations, the gNB may configure multiple CMR groups for CJT-CSI measurement and the IMRs associated with each CMR group in the RRC message. In one implementation, each of the CMR groups includes or configures multiple CMRs, wherein each CMR may be associated with one or more IMRs. Based on the CMR groups, the UE determines the CMRs in the CMR groups (in each group) for CJT-CSI measurement. Therefore, the UE performs CJT-CSI measurements based on CMRs or CMR groups and associated IMRs (if configured). In some implementations, the gNB may include a CMR group index for each of the CMR groups in the RRC message. In other implementations, the gNB does not include the CMR group index in the RRC message. In this case, the UE may determine the CMR group index for each of the CMR groups based on the order of each CMR group in a container (e.g., a list IE such as an add and / or modify list IE) that includes the CMR groups.

[0137] In some implementations, the gNB may trigger CJT-CSI reporting by transmitting a trigger message (e.g., MAC CE or DCI) to the UE. In response to the trigger message, the UE transmits one or more CJT-CSI reports to the gNB on uplink resources. In one example, the gNB may trigger semi-persistent CJT-CSI reporting by transmitting a MAC CE to the UE. The gNB may stop or deactivate semi-persistent CJT-CSI reporting by transmitting a deactivation command (e.g., MAC CE) to the UE. In another example, the gNB may trigger aperiodic CJT-CSI reporting by transmitting a DCI to the UE. In some implementations, the UE may perform CJT-CSI measurements based on the CMR / IMR configured in the CSI-reportConfig IE for periodic CJT-CSI reporting. In some implementations, the UE may perform CJT-CSI measurements based on the CMR / IMR configured in the CSI-reportConfig IE for semi-persistent or aperiodic CJT-CSI reporting after receiving the trigger message. After receiving the deactivation command, the UE may stop performing CJT-CSI measurement based on the CMR / IMR configured in the CSI-reportConfig IE for semi-persistent CJT-CSI reporting.

[0138] In some implementations, the UE has multiple CSI processing units (CPUs) dedicated to CJT-CSI measurement and / or reporting. In one implementation, the number of the multiple CPUs determines the maximum number of CJI-CSI reports of reference signals that the UE can simultaneously measure and process, for which this capability is provided. When performing CJT-CSI measurement and / or reporting, the UE determines the CSI processing unit (CPU) occupancy of each of the CPUs.

[0139] In other implementations, the UE has multiple CSI processing units (CPUs), and the UE can use these CSI processing units (CPUs) to perform CJT-CSI measurements and / or reports as well as other types of CSI measurements and / or reports (e.g., non-CJT-CSI measurements and / or reports). When performing CJT-CSI measurements and / or reports as well as other types of CSI measurements and / or reports, the UE determines the CSI processing unit (CPU) occupancy of each CPU in the CPU. In one implementation, if the UE has used a CPU for non-CJT-CSI measurements and / or reports, the UE cannot use the CPU to perform CJT-CSI measurements and / or reports. Similarly, if the UE has used a CPU for CJT-CSI measurements and / or reports, the UE cannot use the CPU to perform non-CJT-CSI measurements and / or reports.

[0140] In some implementations, the UE may measure and report CJT-CSI reports based on CMRs and associated IMRs, CPU occupancy rules, and minimum processing delays for CSI triggered by other CSI-reportConfigs and CJT-CSI. In some implementations, in the CJT-CSI report, the UE may report a CMR group index or multiple CSI-RS resource indices (CRIs) and corresponding CSI, such as RI / PMI / CQI / LI. The CMR group index identifies or indicates a specific CMR group in the configured CMR groups, and the UE obtains CSI from the CMRs and associated IMRs (if configured) in the specific CMR group. The CRI identifies or indicates the specific CMR and associated IMR (if configured) from which the UE obtains CSI.

[0141] Fig.14 is a flow chart depicting a method 1400 of CJT CSI reporting by a user equipment (UE) device according to some embodiments. Fig.15 is a flow chart depicting a method 1500 for CJT CSI reporting by a network entity according to some embodiments. According to aspects of the present disclosure, unless otherwise specified, RRC signaling may include an RRC reconfiguration message from the gNB to the UE, or a system information block (SIB), where the SIB may be an existing SIB (e.g., SIB1) or a new SIB (e.g., SIBJ, J>21) transmitted by the gNB. In addition, the gNB may obtain UE capabilities via UE capability report signaling or from the core network (e.g., access and mobility management function (AMF)).

[0142] In addition, in the present disclosure, the described solutions are based on 5G NR technology. It should be understood that the solutions can be applied to other wireless technologies such as 6G. "gNB" can be summarized as a base station or a radio access network (RAN) node.

[0143] In an embodiment, a UE may report its capabilities regarding the maximum number of TRPs that the UE may support for CJT-CSI reporting, the maximum number of CMRs per CSI-reportConfig for CJT-CSI reporting, the maximum number of antenna ports per CMR for CJT-CSI reporting, the maximum number of total antenna ports for CMRs across CJT-CSI reporting, the maximum number of CMRs across CSI-reportConfig for CJT-CSI reporting, and / or the maximum number of CSI-reportConfig for CJT-CSI reporting. These numbers may be counted per component carrier (CC), per bandwidth part (BWP), per band, per band combination, and / or per UE.

[0144] In an embodiment, for CMR configuration for CJT-CSI measurement, the gNB may configure N CMR groups for CSI reporting through RRC signaling, for example, in CSI-reportConfig transmitted by the gNB to the UE, where N should be an integer greater than 0. Within CMR group k, the gNB may configure N TRP,k CMRs, where N TRP,k Should be an integer greater than 1. Each CMR in a CMR group corresponds to a TRP. In the CSI report, the UE may report the CMR group index, and the corresponding RI / PMI / CQI / LI measured from the CMR. In one implementation, for the UE to report a CMR group index k, the CSI should be measured from all CMRs in the CMR group. In another implementation, for the UE to report a CMR group index k, the UE may report an indicator to report the index of the measured CMR in the CMR group to report which CMR(s) in the CMR group the CSI is measured from. In one implementation, if the gNB only activates or configures 1 CMR group for CSI reporting, the UE does not report the CMR group index.

[0145] In one implementation, for IMR configuration, the gNB may configure one ZP IMR and / or one NZP IMR associated with each CMR group through RRC signaling, such as RRC parameters in CSI-reportConfig, where CMR / IMR are associated in an N-to-one manner. The UE may measure interference based on the configured IMR and measure the channel based on the CMR configured with the CMR group. For such N-to-one CMR / IMR association operation, for UEs with multiple beams, such as those supporting quasi-co-located (QCL) type (QCL with spatial Rx parameters) or in frequency range 2, the UE may receive IMR based on multiple QCL-TypeD assumptions based on all CMRs in the CMR group. In one example, if the UE receives CMRs in a CMR group based on UE beams #1, #2, and #3, the UE receives IMRs based on beams #1, #2, and #3. Interference may be measured based on the average / maximum / minimum / total interference measured from the UE beams (UE antenna ports).

[0146] Fig.16An example of a CMR / IMR configuration and associated CSI framework 1600 for CJT-CSI reporting according to some embodiments is shown. Example 1600 shows an example of a CSI framework for this implementation. In one example, in the CSI-ResourceConfig of a CMR configured for semi-persistent / periodic CJT-CSI reporting, the gNB may configure up to N resource sets in nzp-CSI-RS-ResourceSetList, where resource set k has N TRP,k In the CSI-ResourceConfig of the IMR configured for semi-persistent / periodic CJT-CSI reporting, the gNB may configure a resource set with N resources in nzp-CSI-RS- ResourceSetList or csi-IM-ResourceSetList. In another example, for aperiodic CJT-CSI reporting, the gNB may configure up to N resourceSets in CSI-AssociatedReportConfigInfo for the gNB to select N CMR groups.

[0147] The gNB may indicate the associated IMRs by indicating N csi-IM-ResourcesForInterference and nzp-CSI-RS-ResourcesForInterference in CSI-AssociatedReportConfigInfo, where each resource set of the IMRs includes one IMR. In some embodiments, the gNB may indicate the associated IMRs by indicating one csi-IM-ResourcesForInterference and one nzp-CSI-RS-ResourcesForInterference in CSI-AssociatedReport ConfigInfo, where each resource set of the IMRs includes N IMRs. In some embodiments, for aperiodic CJT-CSI reporting, the gNB triggers all configured CMR sets and / or all configured IMR sets of the triggered CSI-ReportConfig, e.g., the UE ignores the RRC parameters resourceSet, nzp-CSI-RS-ResourceSetList, or csi-IM-ResourceSetList, or the gNB avoids configuring resourceSet, nzp-CSI-RS-ResourceSetList, or csi-IM- ResourceSetList. The gNB transmits one or more RRC messages (e.g., an RRCReconfiguration message or an RRCResume message) including these configurations to the UE.

[0148] In another implementation, for IMR configuration, the gNB may configure the N associated with the CMR in the CMR group through RRC signaling, for example, RRC parameters in CSI-reportConfig. TRP,k ZP IMR and / or N TRP,k NZP-IMRs, where CMR / IMRs are associated in a one-to-one manner. For such one-to-one CMR / IMR association operation, the UE may measure interference based on the minimum / average / maximum / total interference measured from the configured IMRs of the CMR group. For interference measurement from NZP-IMRs, the gNB may configure an antenna combining factor for each NZP-IMR resource associated with a CMR in the CMR group. In one implementation, for the NZP-IMR of CMR group k, the measured interference from subcarrier u may be calculated as ,in Indicates the antenna combining factor configured by the gNB for NZP IMR resource j, Indicates the effective channel of subcarrier u estimated from NZP-IMR j. In some embodiments, the antenna combining factor of NZP-IMR may be predefined.

[0149] Fig.17 Example 1700 of CMR / IMR configuration and associated CSI framework for CJT-CSI reporting according to some embodiments is shown. Example 1700 shows an example of a CSI framework for this implementation. In one example, in the CSI-ResourceConfig of CMR / IMR configured for semi-persistent / periodic CJT-CSI reporting, the gNB may configure N resource sets in nzp-CSI-RS-ResourceSetList or csi-IM-ResourceSetList, where resource set k has N TRP,k In another example, for non-periodic CJT-CSI reporting, the gNB may configure up to N resourceSets, csi-IM-ResourcesForInterference, nzp-CSI-RS-ResourcesForInterference in CSI-AssociatedReportConfigInfo for the gNB to select N CMR groups and the corresponding ZP-IMR and NZP-IMR. In another example, for non-periodic CJT-CSI reporting, the gNB may configure up to N resourceSets in CSI-AssociatedReportConfigInfo for the gNB to select N CMR groups and the associated ZP-IMR / NZP-IMR. In some embodiments, for aperiodic CJT-CSI reporting, the gNB triggers all configured CMR sets and / or all configured IMR sets of the triggered CSI-ReportConfig, for example, the UE ignores the RRC parameters resourceSet, nzp-CSI-RS-ResourceSetList or csi-IM-ResourceSetList, or the gNB avoids configuring resourceSet, nzp-CSI-RS-ResourceSetList or csi-IM- ResourceSetList. The gNB transmits one or more RRC messages (e.g., RRCReconfiguration message or RRCResume message) including these configurations to the UE.

[0150] In another implementation, for IMR configuration, the gNB may configure a ZP IMR and / or N associated with a CMR in a CMR group through RRC signaling, for example, RRC parameters in CSI-reportConfig. TRP,kNZP IMRs, where CMR and NZP-IMR are associated one-to-one. The behavior of UE performing interference measurement on ZP / NZP IMR is based on the above implementation methods for N-to-one CMR / IMR association and one-to-one IMR / CMR association respectively.

[0151] In another implementation, for IMR configuration, the gNB may configure an NZP IMR and / or NZP IMR associated with a CMR in a CMR group through RRC signaling, such as RRC parameters in CSI-reportConfig. TRP,k The behavior of the UE performing interference measurement on the NZP / ZP IMR is based on the above implementations for N-to-one CMR / IMR association and one-to-one IMR / CMR association, respectively.

[0152] In another embodiment, for CMR configuration for CJT-CSI measurement, the gNB may configure N via RRC signaling, for example, in CSI-reportConfig. TRP CMR groups are used for CSI reporting, where N TRP It should be an integer greater than 1. Within CMR group k, the gNB can configure M k CMR, of which M k Should be an integer greater than 0. Each CMR group corresponds to a TRP. In the CSI report, the UE may report 1 or more CRIs, and the corresponding RI / PMI / CQI / LI measured from the CMR, where reporting 1 CRI indicates that the CSI is measured from a single TRP, and reporting more than 1 CRI indicates that the CSI is measured from multiple TRPs. In one implementation, the CRIs may be counted across CMR groups. In another implementation, the CRIs may be counted within a CMR group, and then the UE may report the CMR group index in addition to each reported CRI. The number of reported CRIs associated with RI / PMI / CQI / LI may be predefined, for example, based on the number of CMR groups, or configured by the gNB through RRC signaling in CSI-reportConfig or MAC CE, or reported by the UE in the CSI report. In one example, the UE may report the selected CMR group index in the CSI report. Then, the number of reported CRIs should be the same as the number of selected CMR group indices. For CSI reported in long PUCCH or PUSCH, the selected CMR group index may be reported in CSI part 1. Then, the CSI reported in CSI part 2 should be reported based on the CMR group index reported in CSI part 1.

[0153] In an implementation, for IMR configuration, the gNB may configure the IMR associated with the CMR in the CMR group through RRC signaling, for example, RRC parameters in CSI-reportConfig. k ZP IMR and / or M k NZP-IMRs, where CMR / IMRs are associated in a one-to-one manner. For such one-to-one CMR / IMR association operation, the UE may measure interference based on the minimum / average / maximum / total interference measured from the configured IMRs associated with the CMRs indicated by the reported CRI. For interference measurement from NZP-IMRs, the gNB may configure an antenna combining factor for each NZP-IMR resource associated with a CMR in a CMR group. In one implementation, for the NZP-IMR of CMR group k, the measured interference from subcarrier u may be calculated as ,in Indicates the antenna combining factor configured by the gNB for NZP IMR resource j, Indicates the effective channel of subcarrier u estimated from NZP-IMR j. In some embodiments, the antenna combining factor of NZP-IMR may be predefined.

[0154] Fig.18 Example 1800 of CMR / IMR configuration and associated CSI framework for CJT-CSI reporting according to some embodiments is shown. Example 1800 shows an example of a CSI framework for this implementation. In one example, in the CSI-ResourceConfig of CMR / IMR configured for semi-persistent / periodic CJT-CSI reporting, the gNB may configure N in nzp-CSI-RS-ResourceSetList or csi-IM-ResourceSetList TRP resource sets, where resource set k has M k In another example, for aperiodic CJT-CSI reporting, the gNB may configure up to N resources in CSI-AssociatedReportConfigInfo. TRP resourceSet, csi-IM-ResourcesForInterference and nzp-CSI-RS-ResourcesForInterference for gNB to select N TRPCMR groups and corresponding ZP-IMR and NZP-IMR. In some embodiments, for non-periodic CJT-CSI reporting, the gNB triggers all configured CMR sets and / or all configured IMR sets of the triggered CSI-ReportConfig, for example, the UE ignores the RRC parameters resourceSet, nzp-CSI-RS-ResourceSetList or csi-IM-ResourceSetList, or the gNB avoids configuring resourceSet, nzp-CSI-RS-ResourceSetList or csi-IM- ResourceSetList. The gNB transmits one or more RRC messages (e.g., RRCReconfiguration message or RRCResume message) including these configurations to the UE.

[0155] In another implementation, the gNB may configure one ZP-IMR and / or one NZP-IMR associated with the CMR corresponding to the CRI combination. Then, the CMR and IMR corresponding to the CRI combination may be associated in an N-to-one manner. The interference measurement operation in the above embodiment for N-to-one CMR / IMR association may be applied.

[0156] In another implementation, the gNB may configure a one-to-one association for CMR and ZP-IMR, and an N-to-one association for CMR and NZP-IMR.

[0157] In another implementation, the gNB may configure a one-to-one association for CMR and NZP-IMR, and an N-to-one association for CMR and ZP-IMR.

[0158] In an embodiment, regarding dynamic TRP selection, the gNB may dynamically select TRP based on beam quality reports, such as layer 1 reference signal received power (L1-RSRP) or layer 1 signal to interference plus noise (L1-SINR). The gNB may dynamically activate or deactivate some CMR groups or CSI-reportConfig via MAC CE or DCI. The MAC CE may include at least one of the following elements: ● Serving cell index, which is used to indicate the serving cell index of CSI-reportConfig ● Bandwidth part index, which is used to indicate the bandwidth part index of CSI-reportConfig ● CSI report index, which is used to indicate the CSI-reportConfigId of the CSI-reportConfig, • Active CMR group index, which may be a bitmap for indicating the CMR group index to be activated. ● Transmission Configuration Status (TCI) index of the active CMR, which can be used to indicate the beam / quasi-colocation information of the active CMR

[0159] In some implementations, the gNB and the UE may determine that the IMR shares the same activation / deactivation state as the associated CMR or CMR group.

[0160] For dynamic activation or triggering based on DCI, the gNB can configure the candidate CMR group index corresponding to the CSI triggering state configured by CSI-AssociatedReportConfigInfo for the triggered CSI-reportConfig. Then, the gNB can dynamically activate the CMR group index for CJT-CSI measurement and reporting by indicating the CSI triggering state in the DCI field CSI request in DCI (e.g. DCI 0_1) to trigger the UE to send CJT-CSI report.

[0161] Fig.19 An example of an aperiodic CSI trigger state configuration according to some embodiments is shown 1900. An example implementation of N CMR sets and 1 IMR set on ASN.1 for aperiodic CSI reporting is as follows:

[0162] An example implementation of N CMR sets and N IMR sets over ASN.1 for aperiodic CSI reporting is as follows:

[0163] In some implementations, the gNB may include one or more CSI-AssociatedResourceConfigInfo-r18 IEs in the CSI-AperiodicTriggerStateList-r18 IE, include CSI-AperiodicTriggerStateList-r18 in the CSI-MeasConfig IE, and transmit an RRC message including the CSI-MeasConfig IE to the UE. Thus, the UE may perform CJT-CSI measurement and reporting for aperiodic CJT-CSI reporting according to the CMR set and one or more IMRs configured in the CSI-AssociatedResourceConfigInfo-r18 IE.

[0164] To configure CJT-CSI measurement and reporting, the gNB may transmit to the UE the CSI configuration parameters: aperiodicTriggerStateList(-r18) (i.e., CSI trigger state list), csi-ReportConfigtoAddModList (i.e., CSI-ReportConfig IE list), csi-ResourceConfigToAddModList, and nzp-CSI-RS-ResourceToAddModList. aperiodicTriggerStateList(-r18) applies only to aperiodic CSI reporting. For periodic and semi-persistent CSI reporting, the UE follows the configuration in each CSI-ReportConfig. In some implementations, the gNB transmits to the UE at least one RRC message (e.g., RRCReconfiguration message and / or RRCResume message) including the CSI configuration parameters.

[0165] In some implementations, each of the at least one CSI-ReportConfig IE in csi-ReportConfigtoAddModList includes a list of CSI resource group configurations that configure the CMR group as shown below. The following example implementations may be applied to periodic, semi-persistent, and aperiodic CJT-CSI reporting. Example implementation of CSI-ReportConfig IE 1

[0166] As shown in example implementation 1, the gNB may configure N CMR groups and / or N IMR groups by including csi-ResourcesGroup ConfigList-r18 including CSI-ResouresGroupConfig IE1, ..., N in the CSI-ReportConfig IE. That is, CSI-ResouresGroupConfig IE 1, ..., N corresponds to CMR groups 1, ..., N. In one implementation, the gNB and the UE determine CSI-ResouresGroupConfig IE 1, ..., N with indices 1, ..., N, respectively, according to the order of CSI-ResouresGroupConfig IE 1, ..., N in csi-ResourcesGroupConfigList-r18. With this implementation, the gNB and the UE may ignore or discard resourcesForChannelMeasurement, csi-IM- ResourcesForInterference, and nzp-CSI-RS-ResourcesForInterference. Example implementation of CSI-ReportConfig IE 2

[0167] As shown in Example Implementation 2, the gNB may configure N-1 CMR groups and / or N-1 IMR groups by including the csi-ResourcesGroupConfigList-r18 including CSI-ResourcesGroupConfig-r18IE 2, ..., N in the CSI-ReportConfig IE. That is, the CSI-ResouresGroupConfig IE 1, ..., N corresponds to CMR groups 2, ..., N. In one implementation, the gNB and the UE determine the CSI-ResouresGroupConfig IE 2, ..., N with indices of 2, ..., N, respectively, according to the order of the CSI-ResouresGroupConfig IE 2, ..., N in the csi-ResourcesGroupConfigList-r18. With this implementation, the gNB and the UE may determine resourcesForChannelMeasurement, csi-IM-ResourcesFor Interference, and nzp-CSI-RS-ResourcesForInterference as CMR group 1 with an index of 1.

[0168] Using either of example implementations 1 and 2, the gNB may include one or more CSI-ReportConfig IEs in the csi-ReportConfigToAddModList, include the csi-ReportConfigToAddModList in the CSI-MeasConfig IE, and transmit the csi-ReportConfigToAddModList to the UE. Thus, the UE may perform CJT-CSI measurement and reporting according to the CSI-ReportConfig IE. Example implementation of CSI-ReportConfig IE 3

[0169] As shown in example implementation 3, the gNB may configure N CMR groups and / or N IMR groups by including the csi-ResourcesGroup ConfigList-r18 including CSI-ResouresGroupConfig IE1, ..., N in the CSI-ReportConfig-r18 IE. That is, the CSI-ResouresGroupConfig IE 1, ..., N corresponds to CMR groups 1, ..., N. In one implementation, the gNB and the UE determine the CSI-ResouresGroupConfig IE 1, ..., N with indexes 1, ..., N, respectively, according to the order of the CSI-ResouresGroupConfig IE 1, ..., N in the csi-ResourcesGroupConfigList-r18.

[0170] In some implementations, the gNB may include one or more CSI-ReportConfig-r18 IEs in csi-ReportConfigToAddModList-r18, include csi-Report ConfigToAddModList-r18 in CSI-MeasConfig IE, and transmit an RRC message including the CSI-MeasConfig IE to the UE. Thus, the UE may perform CJT-CSI measurement and reporting according to the CMR set and one or more IMRs configured in the CSI-ReportConfig-r18 IE.

[0171] In some implementations, IEs with the suffix "-r18" may be replaced with "v18xy", where "x" and "y" may be integers. Note that the field or IE names described above are for the purpose of describing the present disclosure, and the field or IE names may be changed to similar content. "CMR group" and "CRM set" may be interchangeable. "IMR group" and "IRM set" may be interchangeable.

[0172] In an embodiment, for each TRP used for CJT-CSI reporting, the gNB may provide a common codebook configuration to the UE via RRC signaling, such as codebookConfig.

[0173] In another embodiment, for each TRP for CJT-CSI reporting, the gNB may provide a separate codebook configuration to the UE through RRC signaling. In one implementation, a list of codebook configurations may be provided, where each codebook configuration may correspond to each TRP. In another implementation, a common RRC signaling codebookConfig may be provided, but within this RRC structure, the gNB may configure a list of some parameters in codebookConfig to provide some configurations separately for TRPs, such as numberOfPMI-Subbands PerCQI-SubbandList, paramCombinationList, etc.

[0174] In an implementation, to reduce UE memory for signal buffering, the gNB shall avoid configuring different periodicities or different periodicities and offsets for periodic / semi-persistent CSI-RS configured for CJT-CSI measurement from different TRPs, where the periodicity and offset are configured via RRC signaling periodityAndOffset. In some embodiments, the UE may report its capability to support CJT-CSI measurement for periodic / semi-persistent CSI-RS configured with different periodicities and / or offsets from different TRPs. The UE may further report the capability on the number of different periodicities and / or offsets it can support, where the number may be lower than the maximum number of TRPs for CJT operation (e.g., 4).

[0175] In addition, considering the influence of the automatic gain control (AGC) of the UE, the gNB transmits the CSI-RS for CJT-CSI measurement within one slot or S consecutive slots, where S can be predefined or reported from the UE to the gNB through the UE capability. Therefore, a common AGC factor can be applied to all CSI-RS.

[0176] In an embodiment, to reduce the complexity of CSI measurement for the UE, for wideband and / or subband CJT-CSI reporting, the gNB should avoid configuring different physical resource blocks (PRBs) for CSI-RS configured for CJT-CSI measurement from different TRPs, where the PRBs of the CSI-RS are configured through RRC signaling frequencyDomainAllocation. In some embodiments, the UE may report its capability regarding whether it supports CJT-CSI measurement for CSI-RS with different PRBs. The UE may further report its capability regarding the number of different PRBs it can support, where the number may be lower than the maximum number of TRPs for CJT operation (e.g., 4). In some embodiments, if the PRBs of the CSI-RS for CJT-CSI measurement are configured to be different, the UE may measure CJT-CSI for the common PRBs among the CSI-RS.

[0177] In an embodiment, the gNB may configure the energy per resource element (EPRE) ratio between PDSCH and CSI-RS from the same TRP through higher layer signaling, e.g., RRC signaling in NZP-CSI-RS-Resource, or MAC CE, or DCI. In one example, for semi-persistent CSI-RS, the EPRE ratio may be configured through MAC CE for semi-persistent CSI-RS activation. In another example, for aperiodic CSI-RS, different EPRE ratios may be associated with different CSI triggering states, and the gNB may indicate different CSI triggering states by indicating different values ​​of CSI requests in DCI.

[0178] For antenna combination weight selection for CSI measurement for CJT, the UE may construct a combined channel from all configured TRPs based on the estimated channel and power offset. In one example, for CJT from 4 TRPs, the channel may be constructed as ,in Indicates the power scaling factor of TRP j. The power scaling factor can be determined based on the EPRE ratio between CSI-RS and PDSCH. CPU usage rules and minimum processing delay

[0179] If the gNB's scheduling results in the number of occupied CPUs exceeding the maximum number of CPUs reported by the UE in the UE's capabilities or the scheduling offset is less than the minimum processing delay for CSI reporting, the UE may ignore or discard the DCI used to trigger the CSI report or report outdated CSI. In some embodiments, the UE may assume or determine that such scheduling should be an error condition.

[0180] In an embodiment, for CMR grouping scheme 1, for example, Figure 6 and Figure 7 The CMRs in the groups correspond to different TRPs. For such CSI-reportConfig, the number of CPUs may be predefined or determined based on the number of CMR groups and / or the number of CMRs in each group.

[0181] In the implementation, the gNB and UE may assume that they should occupy This CPU occupancy rule assumes that one CPU is occupied by the UE to measure the precoder of one TRP, and the other CPU is used to measure the cross-TRP antenna combining factor and other CSI information for each group.

[0182] In another implementation, the gNB and the UE may assume that they should occupy This CPU occupancy rule assumes that one CPU is occupied by the UE to measure the precoder of one TRP, and one of the CPUs used for each TRP precoder search can be used to measure the cross-TRP antenna combining factor and other CSI information for each group.

[0183] In another implementation, the gNB and the UE may assume that they should occupy CPUs, where S indicates the maximum number of different CMRs in CSI-reportConfig. This CPU occupation rule assumes that one CPU is occupied by the UE to measure the precoder of one TRP, where the UE only calculates the overlapping CMR once, and the other CPU is used to measure the cross-TRP antenna combining factor and other CSI information for each group.

[0184] In another implementation, the gNB and the UE may assume that they should occupy CPUs, where S indicates the maximum number of different CMRs in CSI-reportConfig. This CPU occupation rule assumes that one CPU is occupied by the UE to measure the precoder of one TRP, where the UE only calculates the overlapping CMR once, and one of the CPUs used for each TRP precoder search can be used to measure the cross-TRP antenna combining factor and other CSI information for each group.

[0185] In another implementation, the gNB and the UE may assume that they should occupy This CPU occupancy rule assumes that each CMR group occupies one CPU and parallel processing is not supported within a CMR group.

[0186] In another implementation, the gNB and UE may assume that 1 CPU should be occupied. This CPU occupancy rule assumes that no parallel processing is applied.

[0187] In another embodiment, for CMR grouping scheme 2, for example, Figure 8 A CMR in a group corresponds to one TRP. For such a CSI-reportConfig, the number of CPUs may be predefined or determined based on the number of CMRs in each group.

[0188] In the implementation, the gNB and UE may assume that they should occupy This CPU occupancy rule assumes that one CPU is occupied by the UE to measure the precoder of one TRP, and the other CPU is used to measure the cross-TRP antenna combining factor and other CSI information for each group.

[0189] In another implementation, the gNB and the UE may assume that they should occupy This CPU occupancy rule assumes that one CPU is occupied by the UE to measure the precoder of one TRP, and one of the CPUs used for each TRP precoder search can be used to measure the cross-TRP antenna combining factor and other CSI information for each group.

[0190] In another implementation, the gNB and the UE may assume that they should occupy This CPU occupancy rule assumes that one CPU is occupied for CRI combination processing, and that CRI combination is used and parallel processing is not supported.

[0191] In another implementation, the gNB and UE may assume that 1 CPU should be occupied. This CPU occupancy rule assumes that no parallel processing is applied.

[0192] In an embodiment, the minimum processing delay of the CJT-CSI report may be predefined.

[0193] In one implementation, the minimum processing delay for CJT-CSI reports may be the same as for Type 2 CSI reports. In one example, it may be (Z2, Z2') as defined in Section 5.4 of 38.214.

[0194] In another implementation, the minimum processing delay is determined based on the maximum number of TRPs configured for CJT-CSI reporting and the minimum processing delay for Type 2 CSI reporting. The maximum number of TRPs configured for CJT-CSI reporting may refer to the maximum number of CMR groups associated with CJT-CSI reporting or the maximum number of CMRs in a CMR group. In one example, it may be (r*N TRP *Z2, r*N TRP*Z2'), where r can be in the range of (0, 1], which can be predefined or configured through RRC signaling from the gNB or reported by the UE capability.

[0195] In another embodiment, the UE may report its capability of minimum processing delay of CJT-CSI report (Z, Z').

[0196] In one implementation, the UE may report multiple pairs of (Z, Z') for different numbers of TRPs. For example, a UE supporting CJT with up to 4 TRPs may report 3 pairs of (Z, Z') for CJT based on 2TRP, 3TRP, and 4TRP, respectively.

[0197] In another implementation, the UE may report a pair of (Z, Z') regardless of the number of TRPs used for CJT, and the UE capability is applied to CJT-CSI reporting with different numbers of TRPs.

[0198] In another implementation, the UE may report a pair of (Z, Z') assuming a number of TRPs (e.g., 2 TRPs). For CJT-CSI with a different number of TRPs, the minimum processing delay may be determined based on the number of TRPs and the reported (Z, Z'), e.g., the minimum processing delay may be determined as (ceil(X / 2)*Z, ceil(X / 2)*Z'), where X indicates the number of TRPs configured in the CSI report. In some cases, X indicates the number of CMR groups associated with the CJT-CSI report or the number of CMRs in a CMR group.

[0199] Unless otherwise specifically noted, terms such as "establishing", "receiving", "transmitting", etc. refer to actions and processes performed or implemented by a computing device that manipulate data represented as physical (electronic) quantities within registers and memories of the computing device into other data similarly represented as physical quantities within the computing device memory or registers or other such information storage, transmission or display devices. In addition, the terms "first", "second", "third", "fourth", etc. as used herein are intended as labels to distinguish different elements and may not necessarily have ordinal meanings according to their numerical designations.

[0200] The examples described herein also relate to an apparatus for performing the operations described herein. This apparatus may be specially constructed for the desired purpose, or the apparatus may include a general-purpose computing device selectively programmed by a computer program stored in the computing device. Such a computer program may be stored in a computer-readable non-transitory storage medium.

[0201] The methods and illustrative examples described herein are not inherently related to any particular computer or other device. Various general purpose systems may be used according to the teachings described herein, or more specialized devices may be conveniently constructed to perform the required method steps. The required structures of a variety of these systems will be presented as described above.

[0202] The above description is intended to be illustrative rather than restrictive. Although the present disclosure has been described with reference to specific illustrative examples, it will be appreciated that the present disclosure is not limited to the described examples. The scope of the present disclosure should be determined with reference to the following claims and the full scope of equivalents to which the claims are authorized.

[0203] As used herein, the singular forms "a", "an", "said", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should be further understood that the terms "includes", "including", "includes", and / or "including" when used herein specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. Therefore, the terms used herein are for the purpose of describing specific embodiments only and are not intended to be limiting.

[0204] It should also be noted that in some alternative implementations, the functions / actions noted may not occur in the order noted in the figures. For example, two figures shown in succession may actually be performed substantially simultaneously or may sometimes be performed in reverse order, depending on the functionality / actions involved.

[0205] Although the method operations are described in a particular order, it should be understood that other operations may be performed between the described operations, that the described operations may be adjusted so that they occur at slightly different times, or that the described operations may be distributed in a system that allows the processing operations to occur at various intervals associated with the process.

[0206] Various units, circuits, or other components may be described or claimed as being "configured to" or "configurable to" perform one or more tasks. In such contexts, the phrases "configured to" or "configurable to" are used to represent a structure by indicating that a unit / circuit / component includes a structure (e.g., a circuit system) that performs one or more tasks during operation. Thus, even if a given unit / circuit / component is not currently operating (e.g., not turned on), it can be said that the unit / circuit / component is configured to perform a task, or can be configured to perform a task. Units / circuits / components used with the "configured to" or "configurable to" language include hardware—e.g., circuits, memory storing program instructions executable to implement operations, and the like. The recitation that a unit / circuit / component is "configured to" perform one or more tasks, or "can be configured to" perform one or more tasks, is expressly intended not to invoke the sixth paragraph of 35 USC §112 with respect to that unit / circuit / component. Additionally, "configured to" or "configurable to" may include general structures (e.g., general circuitry) manipulated by software and / or firmware (e.g., an FPGA or a general purpose processor executing software) to operate in a manner capable of performing the tasks in question. "Configured to" may also include adjusting a manufacturing process (e.g., a semiconductor manufacturing facility) to manufacture a device (e.g., an integrated circuit) suitable for implementing or performing one or more tasks. "Configurable to" is expressly intended not to apply to blank media, an unprogrammed processor or an unprogrammed general purpose computer, or an unprogrammed programmable logic device, programmable gate array, or other unprogrammed device, unless accompanied by a programming medium that imparts the unprogrammed device the ability to be configured to perform the disclosed functions.

[0207] For the purpose of explanation, the above description has been described with reference to specific embodiments. However, the above illustrative discussion is not intended to be exhaustive or to limit the disclosure to the precise form disclosed. Many modifications and variations are possible in view of the above teachings. The embodiments are selected and described in order to best explain the principles of the embodiments and their practical application, so that those skilled in the art can best utilize the embodiments and various modifications that may be suitable for the intended specific use. Therefore, the embodiments of the present invention are considered to be illustrative and not restrictive, and the disclosure is not limited to the details given herein, but may be modified within the scope and equivalents of the appended claims. Example UE Example I:

[0208] 1. A device comprising a processor configured to enable a user equipment (UE): a. UE capability to transmit channel state information (CSI) reports based on codebooks for high / medium UE speeds; b. Decoding control signaling of a CSI report configuration for CSI reporting using a codebook, wherein the codebook is configured for CSI measurement based on more than one instance of at least one CSI-RS configured as a channel measurement resource (CMR), an interference measurement resource (IMR), and a time instance for CSI measurement; c. Receiving CMR and IMR for CSI measurement at the corresponding time instance; d. Measuring the precoder based on at least one time instance of at least one CMR and at least one layer indicator (LI) and / or channel quality indicator (CQI) based on at least one instance of the CMR; e. Transmitting a CSI report including at least one of the measured precoder, CQI, and LI.

[0209] 2. The apparatus of Example 1, wherein the number of instances of CMRs used for CSI measurement can be configured via RRC signaling.

[0210] 3. The apparatus of Example 1, wherein the number of instances of CMRs used for CSI measurement can be configured via a MAC CE.

[0211] 4. The apparatus of Example 1, wherein the number of instances of CMRs used for CSI measurement can be configured via DCI.

[0212] 5. The apparatus of Example 1, wherein the UE may report the number of instances of the CMR used for CSI measurement in the CSI report.

[0213] 6. The apparatus of example 1, wherein the number of time domain bases of the codebook for high / medium UE speed is configurable via RRC signaling.

[0214] 7. The apparatus of example 1, wherein the CSI measurement scheme can be configured through RRC signaling, wherein a first scheme is to measure the CSI based on an actual CMR instance, and a second scheme is to measure the CSI based on a virtual CMR instance.

[0215] 8. The apparatus of Example 7, wherein for the second CSI measurement scheme, a starting offset of the first virtual CMR instance and an interval between two consecutive instances can be configured via RRC signaling.

[0216] 9. The apparatus of Example 1, wherein a non-periodic CSI-RS having multiple instances can be triggered by a DCI.

[0217] 10. The apparatus of Example 9, wherein the number of instances of the non-periodic CSI-RS resource and the interval between two consecutive instances are configurable via RRC signaling.

[0218] 11. The apparatus of Example 9, wherein the number of instances of the non-periodic CSI-RS resource and the interval between two consecutive instances can be configured via DCI.

[0219] 12. The apparatus of Example 9, wherein aperiodic CSI resource sets having CSI-RS resources from the same port and a gap between two consecutive CSI-RS resources can be triggered by DCI.

[0220] 13. The apparatus of Example 13, wherein whether the CSI-RS resources in the non-periodic resource set are from the same port can be configured through RRC signaling.

[0221] 14. The apparatus of Example 13, wherein an interval between two consecutive CSI-RS resources in the non-periodic resource set can be configured via RRC signaling.

[0222] 15. The apparatus of example 1, wherein the UE reports the LI and CQI corresponding to one CMR instance.

[0223] 16. The apparatus of example 15, wherein the CMR index may be a first or a last CMR index.

[0224] 17. The apparatus of Example 15, wherein the CMR index may be configured via RRC signaling.

[0225] 18. The apparatus of Example 15, wherein the CMR index may be reported by the UE.

[0226] 19. The apparatus of example 1, wherein the UE reports more than one LI and CQI corresponding to more than one CMR instance.

[0227] 20. The apparatus of example 19, wherein the UE reports the LI and CQI corresponding to each CMR instance.

[0228] 21. The apparatus of example 19, wherein the UE reports more than one LI and CQI corresponding to a CMR instance having a highest energy or a lowest energy among the CMR instances. BS Example I:

[0229] 1. An apparatus comprising a processor configured to cause a base station (BS): a. UE capability to decode channel state information (CSI) reports based on a codebook for high / medium UE speeds; b. Control signaling for transmitting a CSI report configuration for CSI reporting using a codebook, wherein the codebook is configured for CSI measurement based on more than one instance of at least one CSI-RS configured as a channel measurement resource (CMR), an interference measurement resource (IMR), and a time instance for CSI measurement; c. Transmit CMR and IMR; d. Decoding the CSI report based on the corresponding CSI report configuration; e. Determine the time instance of the CMR for the decoded CSI report; f. Identify a precoder and modulation and coding scheme (MCS) for a physical downlink shared channel (PDSCH) transmission in the time instance based on the determined time instance of the decoded CSI and CMR.

[0230] 2. The apparatus of Example 1, wherein the number of instances of CMRs used for CSI measurement can be configured via RRC signaling.

[0231] 3. The apparatus of Example 1, wherein the number of instances of CMRs used for CSI measurement can be configured via a MAC CE.

[0232] 4. The apparatus of Example 1, wherein the number of instances of CMRs used for CSI measurement can be configured via DCI.

[0233] 5. The apparatus of example 1, wherein the BS may decode a number of instances of a CMR used for CSI measurement in a CSI report.

[0234] 6. The apparatus of example 1, wherein the number of time domain bases of the codebook for high / medium UE speed is configurable via RRC signaling.

[0235] 7. The apparatus of example 1, wherein the CSI measurement scheme can be configured through RRC signaling, wherein a first scheme is to measure the CSI based on an actual CMR instance, and a second scheme is to measure the CSI based on a virtual CMR instance.

[0236] 8. The apparatus of Example 7, wherein for the second CSI measurement scheme, a starting offset of the first virtual CMR instance and an interval between two consecutive instances can be configured via RRC signaling.

[0237] 9. The apparatus of Example 1, wherein a non-periodic CSI-RS having multiple instances can be triggered by a DCI.

[0238] 10. The apparatus of Example 9, wherein the number of instances of the non-periodic CSI-RS resource and the interval between two consecutive instances are configurable via RRC signaling.

[0239] 11. The apparatus of Example 9, wherein the number of instances of the non-periodic CSI-RS resource and the interval between two consecutive instances can be configured via DCI.

[0240] 12. The apparatus of Example 9, wherein aperiodic CSI resource sets having CSI-RS resources from the same port and a gap between two consecutive CSI-RS resources can be triggered by DCI.

[0241] 13. The apparatus of Example 13, wherein whether the CSI-RS resources in the non-periodic resource set are from the same port can be configured through RRC signaling.

[0242] 14. The apparatus of Example 13, wherein an interval between two consecutive CSI-RS resources in the non-periodic resource set can be configured via RRC signaling.

[0243] 15. The apparatus of example 1, wherein the BS can decode the LI and CQI corresponding to one CMR instance.

[0244] 16. The apparatus of example 15, wherein the CMR index may be a first or a last CMR index.

[0245] 17. The apparatus of Example 15, wherein the CMR index may be configured via RRC signaling.

[0246] 18. The apparatus of Example 15, wherein the BS can decode the CMR index in the CSI report.

[0247] 19. The apparatus of example 1, wherein the BS can decode more than one LI and CQI corresponding to more than one CMR instance in the CSI report.

[0248] 20. The apparatus of example 19, wherein the BS may identify a LI and a CQI corresponding to each CMR instance.

[0249] 21. The apparatus of example 19, wherein the BS may identify more than one LI and CQI corresponding to a CMR instance having a highest energy or a lowest energy among the CMR instances. UE Example II

[0250] 1. A device comprising a processor configured to enable a user equipment (UE): a. Transmission to the base station indicates support for one or more capabilities based on coherent joint transmission channel state information (CJT-CSI) reporting; b. Decoding control signaling for a channel state information (CSI) report configuration for a CJT-CSI report having more than one configured channel measurement resource (CMR) and at least one interference measurement resource (IMR) associated with at least one CMR; c. Measuring CJT-CSI based on more than one configured channel measurement resource (CMR) and at least one interference measurement resource (IMR); d. Transmitting a CJT-CSI report to the base station, the CJT-CSI report including indexes corresponding to the plurality of CMRs and corresponding CJT-CSI.

[0251] 2. A device according to Example 1, wherein the UE can report its capabilities regarding: the maximum number of transmit reception points (TRPs) for CJT-CSI reporting, the maximum number of CMRs per CJT-CSI report, the maximum number of antenna ports for CMRs per CJT-CSI report, the maximum number of total antenna ports for CMRs across CJT-CSI reports, the maximum number of CMRs across CJT-CSI reports, and / or the maximum number of CJT-CSI reports.

[0252] 3. The apparatus of Example 1, wherein N CMR groups for CJT-CSI reporting may be configured via RRC signaling, where N shall be an integer greater than 0.

[0253] 4. The apparatus of example 3, wherein within a CMR group k, N from different TRPs can be configured TRP,k CMRs, where N TRP,k It should be an integer greater than 1.

[0254] 5. The apparatus of Example 3, wherein in the CSI report, the UE may report a CMR group index and other CSI information measured from the CMR group.

[0255] 6. The apparatus of Example 3, wherein the other CSI information may be at least one of a rank indicator (RI), a precoder matrix indicator (PMI), a channel quality indicator (CQI), and a layer indicator (LI).

[0256] 7. The apparatus of example 5, wherein zero power IMR (ZP-IMR) and non-zero power IMR (NZP-IMR) can be configured in a CJT-CSI report.

[0257] 8. An apparatus according to Example 5, wherein the ZP-IMR and / or NZP-IMR can be associated with the CMR.

[0258] 9. An apparatus according to example 8, wherein interference of a CMR group can be measured based on average / minimum / maximum / total interference measured from each associated ZP-IMR and / or NZP-IMR.

[0259] 10. The apparatus of Example 5, wherein the ZP-IMR and / or NZP-IMR can be associated with a CMR group.

[0260] 11. The apparatus of example 10, wherein the UE may receive the associated ZP-IMR and / or NZP-IMR using a spatial receive filter for receiving CMRs in the CMR group.

[0261] 12. The apparatus of Example 3, wherein the number of CSI processing units (CPUs) for the CJT-CSI report can be predefined or determined based on the number of CMR groups and / or the number of CMRs within each group.

[0262] 13. The apparatus of example 1, wherein the UE can decode RRC signaling to configure N for CSI reporting. TRP CMR groups, where N TRP It should be an integer greater than 1.

[0263] 14. The apparatus of example 13, wherein within CMR group k, the gNB may configure M k CMR, of which M k Should be an integer greater than 0.

[0264] 15. The apparatus of example 13, wherein zero power IMR (ZP-IMR) and non-zero power IMR (NZP-IMR) can be configured in a CJT-CSI report.

[0265] 16. The apparatus of Example 15, wherein the UE may report more than one CSI-RS resource indicator (CRI) associated with other CSI information in a CJT-CSI report.

[0266] 17. The apparatus of Example 16, wherein the other CSI information may be at least one of a rank indicator (RI), a precoder matrix indicator (PMI), a channel quality indicator (CQI), and a layer indicator (LI).

[0267] 18. An apparatus according to Example 15, wherein the ZP-IMR and / or NZP-IMR can be associated with the CMR.

[0268] 19. An apparatus according to example 15, wherein interference of the CMR associated with the reported CRI can be measured based on average / minimum / maximum / total interference measured from each associated ZP-IMR and / or NZP-IMR.

[0269] 20. An apparatus according to example 15, wherein interference of the CMR associated with the reported CRI can be measured based on the average / minimum / maximum / total interference measured from each associated ZP-IMR and / or NZP-IMR.

[0270] 21. The apparatus of Example 13, wherein the number of CPUs can be predefined or determined based on the number of CMRs per group.

[0271] 22. The apparatus of Examples 3 and 13, wherein the CMR group or CJT-CSI reporting can be dynamically activated or deactivated by the MAC CE.

[0272] 23. The apparatus of Example 3 and Example 13, wherein the CMR group or CJT-CSI report can be dynamically activated or deactivated via DCI.

[0273] 24. The apparatus of Example 1, wherein a common codebook for each TRP can be configured via RRC signaling.

[0274] 25. The apparatus of Example 1, wherein a separate codebook configuration for TRP for CJT can be configured via RRC signaling.

[0275] 26. A device according to Example 1, wherein the common periodicity or periodicity and offset of periodic / semi-persistent CSI-RS for CJT-CSI measurement from different TRPs should be configured through RRC signaling.

[0276] 27. An apparatus according to Example 1, wherein the UE receives CSI-RS for CJT-CSI measurement from different TRPs within a time slot or within N time slots.

[0277] 28. The apparatus of Example 1, wherein N is an integer greater than 1 and may be predefined or reported via UE capabilities.

[0278] 29. The apparatus of Example 1, wherein CSI-RSs for CJT-CSI reporting from different TRPs should be configured with a common physical resource block (PRB).

[0279] 30. An apparatus according to Example 1, wherein the UE measures CJT CSI in a common PRB among CSI-RS used for CJT-CSI reporting from different TRPs.

[0280] 31. A device according to Example 1, wherein the energy per resource element (EPRE) ratio between PDSCH and CSI-RS from the same TRP can be configured through RRC signaling, MAC CE or DCI.

[0281] 32. A device according to Example 1, wherein the minimum processing delay of the CJT-CSI report can be predefined or reported through UE capability signaling.

[0282] 33. A device according to Example 1, wherein if the number of occupied CPUs exceeds the maximum number of CPUs reported by the UE in the UE capabilities or the scheduling offset is less than the minimum processing delay of the CJT-CSI report, the UE may ignore the DCI used to trigger the CJT-CSI report or report outdated CJT-CSI. BS Example II

[0283] 1. An apparatus comprising a processor configured to cause a base station (BS): a. One or more capabilities of the UE receiving an indication based on coherent joint transmission channel state information (CJT-CSI) report from the UE, another base station or the core network; b. transmitting to the UE control signaling of a channel state information (CSI) reporting configuration for a CJT-CSI report based on the one or more capabilities, the CJT-CSI report having more than one configured channel measurement resource (CMR) and at least one interference measurement resource (IMR) associated with at least one CMR; c. Transmitting to the UE a downlink reference signal configured for CMR and IMR for CJT-CSI reporting; d. Receive CJT-CSI report from UE; e. Decoding a CJT-CSI report indicating indices corresponding to a plurality of CMRs and corresponding CJT-CSI.

[0284] 2. An apparatus according to Example 1, wherein the BS can decode UE capabilities regarding: a maximum number of transmit reception points (TRPs) for CJT-CSI reporting, a maximum number of CMRs per CJT-CSI report, a maximum number of antenna ports for CMRs per CJT-CSI report, a maximum number of total antenna ports for CMRs across CJT-CSI reports, a maximum number of CMRs across CJT-CSI reports, and / or a maximum number of CJT-CSI reports.

[0285] 3. The apparatus according to Example 1, wherein the BS may configure N CMR groups for CJT-CSI reporting through RRC signaling, where N shall be an integer greater than 0.

[0286] 4. The apparatus of example 3, wherein within CMR group k, the gNB may configure N from different TRPs TRP,k CMRs, where N TRP,k It should be an integer greater than 1.

[0287] 5. The apparatus of Example 3, wherein in the CSI report, the gNB may receive the CMR group index and other CSI information measured from the CMR group in a CJT-CSI report.

[0288] 6. The apparatus of Example 5, wherein the other CSI information may be at least one of a rank indicator (RI), a precoder matrix indicator (PMI), a channel quality indicator (CQI), and a layer indicator (LI).

[0289] 7. The apparatus of example 5, wherein the BS may configure at least one zero power IMR (ZP-IMR) and / or non-zero power IMR (NZP-IMR) in the CJT-CSI reporting configuration.

[0290] 8. The apparatus of Example 7, wherein the ZP-IMR and / or the NZP-IMR may be associated with the CMR.

[0291] 9. An apparatus according to Example 7, wherein the ZP-IMR and / or NZP-IMR can be associated with a CMR group.

[0292] 10. The apparatus of Example 3, wherein the number of CSI processing units (CPUs) for the CJT-CSI report can be predefined or determined based on the number of CMR groups and / or the number of CMRs within each group.

[0293] 11. The apparatus of Example 1, wherein the BS can configure N for CSI reporting through RRC signaling. TRP CMR groups, where N TRP It should be an integer greater than 1.

[0294] 12. The apparatus of example 11, wherein within CMR group k, the gNB may configure M k CMR, of which M k Should be an integer greater than 0.

[0295] 13. The apparatus of example 11, wherein the BS may configure at least one zero power IMR (ZP-IMR) and / or non-zero power IMR (NZP-IMR) in the CJT-CSI reporting configuration.

[0296] 14. The apparatus of Example 11, wherein the BS may receive more than one CSI-RS resource indicator (CRI) associated with other CSI information in a CJT-CSI report.

[0297] 15. The apparatus of Example 14, wherein the other CSI information may be at least one of a rank indicator (RI), a precoder matrix indicator (PMI), a channel quality indicator (CQI), and a layer indicator (LI).

[0298] 16. An apparatus as described in Example 11, wherein the ZP-IMR and / or NZP-IMR can be associated with the CMR.

[0299] 17. The apparatus of example 11, wherein the number of CPUs can be predefined or determined based on the number of CMRs per group.

[0300] 18. The apparatus of Examples 3 and 11, wherein the CMR group or CJT-CSI reporting can be dynamically activated or deactivated by the MAC CE.

[0301] 19. The apparatus of Example 3 and Example 11, wherein the CMR group or CJT-CSI report can be dynamically activated or deactivated via DCI.

[0302] 20. The apparatus of Example 1, wherein a common codebook for each TRP can be configured via RRC signaling.

[0303] 21. The apparatus of Example 1, wherein a separate codebook configuration for TRP for CJT can be configured via RRC signaling.

[0304] 22. The apparatus of Example 1, wherein the common periodicity or periodicity and offset of periodic / semi-persistent CSI-RS for CJT-CSI measurement from different TRPs shall be configured via RRC signaling.

[0305] 23. The apparatus of Example 1, wherein the BS transmits CSI-RS for CJT-CSI measurement from different TRPs within a time slot or within N time slots.

[0306] 24. The apparatus of Example 1, wherein N is an integer greater than 1 and may be predefined or the gNB may decode UE capabilities regarding supported values ​​of N.

[0307] 25. The apparatus of Example 1, wherein the BS may utilize common physical resource blocks (PRBs) to transmit CSI-RS for CJT-CSI reporting from different TRPs.

[0308] 26. The apparatus of Example 1, wherein an energy per resource element (EPRE) ratio between PDSCH and CSI-RS from the same TRP can be configured via RRC signaling, MAC CE, or DCI.

[0309] 27. The apparatus of Example 1, wherein a minimum processing delay for CJT-CSI reporting can be predefined, or the BS can decode the minimum processing delay for CJT-CSI from UE capability signaling.

[0310] 28. The apparatus of Example 1, wherein the BS may avoid decoding the CJT-CSI report if the number of occupied CPUs exceeds the maximum number of CPUs or the scheduling offset is less than the minimum processing delay of the CJT-CSI report.

Claims

1. A method for wireless communication by a user equipment (UE), the method comprising: Transmitting, by the UE device to a network entity, an indication of a capability to report a channel state information (CSI) report based on signals of a plurality of channel measurement resources (CMRs) or a plurality of transmission / reception points (TRPs) of the network entity; receiving a configuration message from the network entity acting in response to the indication transmitted by the UE device, the configuration message configuring the UE device to determine the CSI report; performing, by the UE device as configured according to the configuration message, concurrent measurements of the plurality of CMRs and at least one interference measurement resource IMR for a plurality of time instances; preparing, based on the concurrent measurements, a single CSI report reflecting time domain variations of two or more CMRs of the plurality of CMRs; as well as The single CSI report including the performed concurrent measurements is transmitted to the network entity.

2. The method according to claim 1, further comprising: Decoding a plurality of instances of a CSI reference signal CSI-RS using a codebook configured for CSI measurement based on the configuration message from the network entity, the plurality of instances of the CSI-RS comprising one or more of: a CMR, an IMR, and a time instance for CSI measurement; obtaining a precoder value based on at least a layer indicator LI or a channel quality indicator CQI corresponding to each of the two or more CMRs of the plurality of CMRs and the at least one IMR; as well as The CSI report is transmitted to the network entity, wherein the CSI report includes the precoder and one or both of the LI and the CQI.

3. The method according to claim 2, further comprising: performing concurrent measurements on the plurality of CMRs and the at least one IMR at the plurality of time instances; determining / generating a single CSI report reflecting time domain variation of each of the two or more CMRs of the plurality of CMRs when the UE device exceeds a threshold speed; as well as The single CSI report is transmitted to the network entity.

4. The method according to claim 2, wherein the configuration message comprises at least one of the following: Radio Resource Control RRC messages; Media Access Control MAC Control Element MAC CE; or Downlink Control Information DCI; and The multiple instances of CSI-RS include aperiodic or semi-persistent CSI-RS.

5. The method of claim 2, wherein the indication of the capability to report the CSI report comprises any one of: a maximum number of instances of CSI-RS resources that the UE device can measure for the CSI report; The number of CSI processing unit CPUs occupied by CSI-RS with multiple instances; The upper limit of the number of information elements (IEs) configured in the CSI report; a minimum processing delay for the CSI report; as well as Whether to support CSI prediction for CSI measurements based on virtual CMR instances.

6. The method according to claim 2, further comprising: Downlink control information DCI for triggering the plurality of CMRs and the at least one IMR is received from the network entity, the plurality of CMRs including the plurality of instances of CSI-RS.

7. The method of claim 5, wherein obtaining the precoder comprises: identifying the instance of the CSI-RS as the CMR; as well as CSI measurements are performed on the instances of the CSI-RS.

8. The method according to claim 2, wherein the configuration message comprises: indicating a number of the plurality of instances of CSI-RS used in the CSI report; The number of time domain bases; as well as Scheme for CSI measurement. 9 . The method of claim 8 , wherein the scheme for CSI measurement comprises a scheme based on a plurality of virtual CMRs and a plurality of physical CMRs measured before a minimum processing delay of the CSI report.

10. The method according to claim 2, further comprising: transmitting the CSI report to the network entity, the CSI report comprising a plurality of measurements of the LI and the CQI based on: (1) a CMR having the maximum energy among the plurality of CMRs or a CMR having the minimum energy among the plurality of CMRs; (2) corresponding performance of one or more CMRs among the plurality of CMRs; (3) the precoder; (4) minimum and maximum values ​​of CQI; or (5) A correspondence between the first instance and the last instance of the plurality of CMRs.

11. The method of claim 10, wherein the codebook is used to decode a non-periodic CSI-RS, the non-periodic CSI-RS being used by the UE device to report the CSI report when the UE device is traveling at a speed not less than a threshold speed relative to the network entity.

12. The method according to claim 1, further comprising: determining, based on the configuration message from the network entity, a configuration of the UE device, the configuration being used to include coherent joint transmit channel state information (CJT-CSI) in the CSI report, wherein the CJT-CSI comprises CSI measurements of signals from the plurality of TRPs coherently combined at the UE device via joint antenna precoding at the plurality of TRPs; receiving, from the plurality of TRPs, the plurality of CMRs and the at least one IMR associated with a CMR among the plurality of CMRs; measuring the CJT-CSI based on the plurality of CMRs and the at least one IMR; as well as The CSI report including one or more indexes corresponding to the multiple CMRs is transmitted to the multiple TRPs.

13. The method of claim 12, wherein the configuration message comprises at least one of: Radio Resource Control (RRC) reconfiguration message; or System Information Block SIB.

14. The method of claim 12, wherein the indication of the capability to report the CSI report comprises, for each component carrier CC, each bandwidth part BWP, each frequency band, each frequency band configuration, or each UE device in a group of UE devices including the UE device, any one of: a maximum number of TRPs supported by the UE device for the CSI reporting of the CJT-CSI; a maximum number of CMRs of the configuration message per the CJT-CSI; a maximum number of antenna ports for each CMR in each of the plurality of CMRs; a maximum number of total numbers of antenna ports of the plurality of CMRs across the CSI report; Maximum number of CMRs across multiple configuration messages (of CSI-reportConfig); as well as The maximum number of the plurality of configuration messages.

15. The method of claim 12, wherein: The plurality of CMRs include one or more groups of CMRs across the plurality of TRPs, The one or more groups of CMRs are configured by the configuration message, and The CSI report includes an index identifying a set of CMRs in the one or more sets of CMRs.

16. The method of claim 15, wherein the CSI report further comprises at least one of: Rank indicator RI; Precoder matrix indicator PMI; Channel quality indicator CQI; a layer indicator; or One or more CSI-RS resource indicators CRI.

17. The method of claim 15, wherein performing concurrent measurements comprises: When a CSI processing unit CPU at the UE device is available for processing the plurality of CMRs, the CJT-CSI is measured, wherein the CPU at the UE device is configured based on a total number of the one or more groups of CMRs.

18. The method according to claim 17, further comprising: determining that a trigger for including CJT-CSI in the CSI report requires a number of CPUs that exceeds a maximum number of CPUs included in the indication of the capability to report CSI reports; and The trigger is discarded or determined to correspond to an erroneous request from the network entity.

19. The method according to claim 17, further comprising: operating a plurality of CPUs to perform a plurality of CJT-CST measurements in parallel for inclusion in the CSI report; The number of the multiple CPUs is forced to determine the maximum number of CJT-CSI measurements that the UE device can perform in parallel.

20. The method of claim 15, wherein the at least one IMR comprises one or more of a zero power IMR ZP-IMR and a non-zero power IMR NZP-IMR, and wherein, The at least one IMR is associated with a set of CMRs among the one or more sets of CMRs.

21. The method according to claim 20, further comprising: measuring the at least one IMR using a plurality of receive beams at the UE device; or The at least one IMR is measured across two or more CMRs in the set of CMRs in the one or more sets of CMRs.

22. A method for wireless communication by a network entity, the method comprising: receiving, from a user equipment (UE) device, an indication of a capability to report a channel state information (CSI) report based on signals of a plurality of channel measurement resources (CMRs) or a plurality of transmission / reception points (TRPs), the plurality of TRPs comprising the network entity; In response to receiving the indication, transmitting a configuration message to the UE device, the configuration message configuring the UE device with respect to the CSI reporting; as well as The CSI report is received at the network entity from the UE device, the CSI report comprising concurrent measurements of a plurality of channel measurement resources (CMRs) and at least one interference measurement resource (IMR) performed by the UE device for a plurality of time instances according to the configuration message.

23. The method of claim 22, further comprising receiving the CSI report from the UE device, the CSI report comprising: a precoder used by the UE device to decode a plurality of instances of a CSI reference signal CSI-RS using a codebook configured for CSI measurement based on the configuration message, the plurality of instances of the CSI-RS comprising one or more of: a CMR, an IMR, and a time instance for CSI measurement; as well as A layer indicator LI or a channel quality indicator CQI corresponding to each of the two or more CMRs of the plurality of CMRs and the at least one IMR.

24. The method of claim 23, wherein the configuration message comprises at least one of: Radio Resource Control RRC messages; Media Access Control MAC Control Element MAC CE; or Downlink Control Information DCI; and The multiple instances of CSI-RS include aperiodic or semi-persistent CSI-RS.

25. The method of claim 23, further comprising: Downlink control information (DCI) for triggering the plurality of CMRs and the at least one IMR is transmitted to the UE device, the plurality of CMRs including the plurality of instances of CSI-RS.

26. The method of claim 23, wherein the configuration message comprises: indicating a number of the plurality of instances of CSI-RS used in the CSI report; The number of time domain bases; as well as Scheme for CSI measurement.

27. The method of claim 26, wherein the scheme for CSI measurement comprises a scheme based on a plurality of virtual CMRs and a plurality of physical CMRs measured before a minimum processing delay for the CSI report.

28. The method of claim 23, further comprising: receiving, from the UE device, the CSI report including a plurality of measurements of the LI and the CQI based on: (1) a CMR having the maximum energy among the plurality of CMRs or a CMR having the minimum energy among the plurality of CMRs; (2) corresponding performance of one or more CMRs among the plurality of CMRs; (3) the precoder; (4) minimum and maximum values ​​of CQI; or (5) A correspondence between the first instance and the last instance of the plurality of CMRs.

29. The method of claim 28, wherein the codebook is used to decode a non-periodic CSI-RS used by the UE device to report the CSI report when the UE device is traveling at a speed not less than a threshold speed relative to the network entity.

30. The method of claim 22, further comprising: providing, to the UE device in the configuration message, the configuration of the UE device, the configuration to include coherent joint transmit channel state information (CJT-CSI) in the CSI report, wherein the CJT-CSI comprises CSI measurements of signals from the plurality of TRPs coherently combined at the UE device via joint antenna precoding at the plurality of TRPs; transmitting, to the UE device, at least a portion of the plurality of CMRs among the plurality of TRPs and the at least one IMR associated with one of the plurality of CMRs; as well as Receive the CSI report including one or more indices corresponding to the plurality of CMRs to the plurality of TRPs and the measurements.

31. The method of claim 30, wherein the configuration message comprises at least one of: Radio Resource Control (RRC) reconfiguration message; or System Information Block SIB.

32. The method of claim 30, wherein: The plurality of CMRs include one or more groups of CMRs across the plurality of TRPs, The one or more groups of CMRs are configured by the configuration message, and The CSI report includes an index identifying a set of CMRs in the one or more sets of CMRs.

33. The method of claim 32, wherein the CSI report further comprises at least one of: Rank indicator RI; Precoder matrix indicator PMI; Channel quality indicator CQI; a layer indicator; or One or more CSI-RS resource indicators CRI.

34. The method of claim 32, wherein the at least one IMR comprises one or more of a zero power IMR ZP-IMR and a non-zero power IMR NZP-IMR, and wherein, The at least one IMR is associated with a set of CMRs among the one or more sets of CMRs.

35. A user equipment UE, comprising: one or more radio frequency (RF) modems; a processor coupled to the one or more RF modems; as well as At least one memory storing executable instructions for manipulating at least one of the processor or the one or more RF modems to perform the method according to any one of claims 1 to 21.

36. A network entity comprising: one or more radio frequency (RF) modems; a processor coupled to the one or more RF modems; as well as At least one memory storing executable instructions for manipulating at least one of the processor or the one or more RF modems to perform the method according to any one of claims 22 to 34.

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