Channel state information reporting for multi-TRP operation

Abstract

The present invention provides various ways of reporting channel state information (CSI) measurements in a multiple transmission reception point (multi-TRP) configuration. A UE may perform channel state information (CSI) measurements for a channel measurement resource (CMR) of a first gNB and at least one interference measurement resource (IMR) of at least one second gNB; determine a configuration of a CSI report for the CSI measurement, the CSI measurement including a channel quality indicator (CQI) measurement for the CMR and the at least one IMR; and transmit the CSI report to at least one of the first gNB and the at least one second gNB.

Description

Background Art

[0001] The multi-transmission reception point (multi-TRP) functionality in 5G New Radio (NR) involves the UE maintaining multiple links with multiple TRPs (e.g., multiple gNBs) simultaneously on the same carrier. Channel state information (CSI) can be measured for each beam pair, however, when both links are used for DL ​​transmission, the individual CSI measurements on each beam pair cannot reflect the true channel quality. Summary of the invention

[0002] Some exemplary embodiments relate to a method performed by a user equipment (UE) having simultaneous connections with a first next-generation Node B (gNB) and at least one second gNB on the same carrier in a multiple transmission reception point (multi-TRP) configuration. The method includes performing channel state information (CSI) measurements for a channel measurement resource (CMR) of the first gNB and at least one interference measurement resource (IMR) of the at least one second gNB; determining a configuration of a CSI report for the CSI measurement, the CSI measurement including a channel quality indicator (CQI) measurement for the CMR and the at least one IMR; and transmitting the CSI report to at least one of the first gNB and the at least one second gNB.

[0003] Other exemplary embodiments relate to a user equipment (UE) having a transceiver and a processor. The transceiver is configured to simultaneously connect to a first next generation node B (gNB) and at least one second gNB on the same carrier. The processor is configured to perform channel state information (CSI) measurements for a channel measurement resource (CMR) of the first gNB and at least one interference measurement resource (IMR) of the at least one second gNB, and determine a configuration of a CSI report for the CSI measurement, the CSI measurement including a channel quality indicator (CQI) measurement for the CMR and the at least one IMR. The transceiver is further configured to transmit the CSI report to at least one of the first gNB and the at least one second gNB.

[0004] Yet another exemplary embodiment relates to a method performed by a user equipment (UE) having simultaneous connections with a first next-generation Node B (gNB) and at least one second gNB on the same carrier in a multiple transmission reception point (multi-TRP) configuration. The method includes performing channel state information (CSI) measurements for a first channel measurement resource (CMR) of the first gNB and a second CMR of the at least one second gNB; determining a configuration of a CSI report for the CSI measurement, the CSI measurement including a channel quality indicator (CQI) measurement for each of the first CMR and the second CMR; and transmitting the CSI report to at least one of the first gNB and the at least one second gNB.

[0005] Additional exemplary embodiments relate to a user equipment (UE) having a transceiver and a processor. The transceiver is configured to simultaneously connect to a first next generation node B (gnB) and at least one second gNB on the same carrier. The processor is configured to perform channel state information (CSI) measurements for a first channel measurement resource (CMR) of the first gNB and a second CMR of the at least one second gNB, and determine a configuration of a CSI report for the CSI measurement, the CSI measurement including a channel quality indicator (CQI) measurement for each of the first CMR and the second CMR. The transceiver is further configured to transmit the CSI report to at least one of the first gNB and the at least one second gNB. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 Network arrangements according to various exemplary embodiments are shown.

[0007] Figure 2 An exemplary UE according to various exemplary embodiments is shown.

[0008] Figure 3 Exemplary network cells are shown according to various exemplary embodiments.

[0009] Figure 4 A network arrangement with UEs in multi-TRP operation is shown, where the UEs can report CSI for each beam pair link independently only.

[0010] Figure 5 A diagram is shown in which, for each channel measurement resource (CMR), the gNB configures N non-zero power based interference measurement resources (NZP-IMR) and one zero power based interference measurement resource (ZP-IMR).

[0011] Figure 6 A diagram showing configuration of CMR groups for each of gNBs x and y is shown.

[0012] Figure 7 A diagram of allowable configurations for RI parameters is shown.

[0013] Figure 8 A method for configuring CSI reporting at a user equipment (UE) in a multiple transmission reception point (multi-TRP) configuration according to a first exemplary embodiment is shown.

[0014] Fig. 9 A method for configuring CSI reporting at a user equipment (UE) in a multiple transmission reception point (multi-TRP) configuration according to a second exemplary embodiment is shown. DETAILED DESCRIPTION

[0015] The exemplary embodiments may be further understood with reference to the following description and associated drawings, wherein similar elements have the same reference numerals. The exemplary embodiments describe channel measurement resource (CMR) configurations and reporting configurations for various multi-TRP scenarios described below.

[0016] The multi-transmission reception point (multi-TRP) functionality involves the UE maintaining multiple links with multiple TRPs (e.g., multiple gNBs) simultaneously on the same carrier. However, in multi-TRP operation, the UE can only report the CSI of each beam pair link independently, such as the first CSI (CSI1) of the first beam pair link from the first TRP (TRP1) and the second CSI (CSI2) of the second beam pair link from the second TRP (TRP2). When multiple links are used for PDSCH transmission, the individual CSI corresponding to only one beam pair link cannot reflect the real channel quality.

[0017] The first exemplary embodiment describes a channel measurement resource (CMR) and interference measurement resource (IMR) configuration for determining CSI and a reporting configuration for a CSI report including parameters for neighbor cell interference. The second exemplary embodiment describes a CMR for determining CSI for two beam pairs and transmitting two sets of measurements to each of the multi-TRP gNBs.

[0018] Network / Equipment

[0019] Figure 1 An exemplary network arrangement 100 according to various exemplary embodiments is shown. The exemplary network arrangement 100 includes a user equipment (UE) 110. Those skilled in the art will appreciate that the UE may be any type of electronic component configured to communicate via a network, such as a component of a connected car, a mobile phone, a tablet computer, a smart phone, a phablet, an embedded device, a wearable device, an Internet of Things (IoT) device, etc. It should also be appreciated that a practical network arrangement may include any number of UEs used by any number of users. Therefore, for purposes of illustration, only an example with a single UE 110 is provided.

[0020] UE 110 can communicate directly with one or more networks. In the example of network configuration 100, the networks with which UE 110 can wirelessly communicate are 5G NR radio access network (5G NR-RAN) 120, LTE radio access network (LTE-RAN) 122, and wireless local area network (WLAN) 124. Therefore, UE 110 may include a 5G NR chipset that communicates with 5G NR-RAN 120, an LTE chipset that communicates with LTE-RAN122, and an ISM chipset that communicates with WLAN 124. However, UE 110 may also communicate with other types of networks (e.g., legacy cellular networks), and UE 110 may also communicate with the network via a wired connection. With respect to an exemplary embodiment, UE 110 may establish a connection with 5G NR RAN 122.

[0021] 5G NR-RAN 120 and LTE-RAN 122 may be part of cellular networks that may be deployed by cellular providers (e.g., Verizon, AT&T, Sprint, T-Mobile, etc.). These networks 120, 122 may include, for example, cells or base stations (NodeB, eNodeB, HeNB, eNBS, gNB, gNodeB, macrocell base stations, microcell base stations, small cell base stations, femtocell base stations, etc.) configured to send and receive traffic from UEs equipped with appropriate cellular chipsets. WLAN 124 may include any type of wireless local area network (WiFi, hotspot, IEEE 802.11x network, etc.).

[0022] UE 110 may be connected to 5G NR-RAN via at least one of next generation nodeB (gNB) 120A and / or gNB 120B. gNB 120A, 120B may be configured with necessary hardware (e.g., antenna array), software and / or firmware to perform massive multiple input multiple output (MIMO) functionality. Massive MIMO may refer to a base station configured to generate multiple beams for multiple UEs. Reference to two gNBs 120A, 120B is for illustrative purposes only. The exemplary embodiments may be applied to any appropriate number of gNBs. Specifically, UE 110 may be connected to and exchange data with multiple gNBs 120A, 120B simultaneously in a multi-cell CA configuration or in a multi-TRP configuration. UE 110 may also be connected to LTE-RAN 122 via either or both of eNBs 122A, 122B, or to any other type of RAN, as described above. UE 110 is shown in network arrangement 100 as being simultaneously connected to gNB 120A and gNB 120B. The connections to gNB 120A, gNB 120B may be, for example, multi-TRP connections, where gNB 120A, gNB 120B both serve UE 110 on the same channel.

[0023] In addition to the networks 120, 122, and 124, the network arrangement 100 includes a cellular core network 130, the Internet 140, an IP multimedia subsystem (IMS) 150, and a network service backbone 160. The cellular core network 130 can be viewed as an interconnected collection of components that manage the operation and traffic of the cellular network. The cellular core network 130 also manages the traffic flowing between the cellular network and the Internet 140. The IMS 150 can be generally described as an architecture for delivering multimedia services to the UE 110 using the IP protocol. The IMS 150 can communicate with the cellular core network 130 and the Internet 140 to provide multimedia services to the UE 110. The network service backbone 160 communicates directly or indirectly with the Internet 140 and the cellular core network 130. The network service backbone 160 can be generally described as a set of components (e.g., servers, network storage arrangements, etc.) that implement a set of services that can be used to extend the functionality of the UE 110 to communicate with various networks.

[0024] Figure 2 An exemplary UE 110 is shown according to various exemplary embodiments. Figure 1100 is used to describe the UE 110. The UE 110 may represent any electronic device and may include a processor 205, a memory arrangement 210, a display device 215, an input / output (I / O) device 220, a transceiver 225, and other components 230. The other components 230 may include, for example, an audio input device, an audio output device, a battery providing a limited power source, a data acquisition device, a port for electrically connecting the UE 110 to other electronic devices, a sensor for detecting the status of the UE 110, and the like.

[0025] Processor 205 may be configured to execute multiple engines of UE 110. For example, these engines may include a channel state information (CSI) engine 235. CSI engine 235 may perform operations including performing CSI measurements and generating CSI reports. Specific implementations of various scenarios will be described in further detail below.

[0026] The above-described engine as an application (e.g., program) executed by the processor 205 is merely exemplary. The functions associated with the engine may also be represented as an independently integrated component of the UE 110, or may be a modular component coupled to the UE 110, such as an integrated circuit with or without firmware. For example, an integrated circuit may include an input circuit for receiving a signal and a processing circuit for processing the signal and other information. The engine may also be embodied as an application or multiple separate applications. In addition, in some UEs, the functionality described for the processor 205 is shared between two or more processors such as a baseband processor and an application processor. The exemplary embodiments may be implemented in any of these or other configurations of the UE. The memory 210 may be a hardware component configured to store data related to the operations performed by the UE 110.

[0027] The display device 215 may be a hardware component configured to display data to a user, and the I / O device 220 may be a hardware component that enables user input. The display device 215 and the I / O device 220 may be separate components or may be integrated together (such as a touch screen). The transceiver 225 may be a hardware component configured to establish a connection with the 5G-NR RAN 120, the LTE RAN 122, etc. Thus, the transceiver 225 may operate on a variety of different frequencies or channels (e.g., a continuous frequency group).

[0028] Figure 3An exemplary network cell, in this case a gNB 120A, is shown according to various exemplary embodiments. As described above with respect to UE 110, gNB 120A may represent a cell in a multi-TRP configuration with UE 110. gNB 120A may represent any access node of a 5G NR network through which UEs 110, 112 may establish connections and manage network operations. Figure 3 The gNB 120A shown may also represent gNB 120B.

[0029] The gNB 120A may include a processor 305, a memory arrangement 310, an input / output (I / O) device 320, a transceiver 325, and other components 330. The other components 330 may include, for example, an audio input device, an audio output device, a battery, a data acquisition device, a port for electrically connecting the gNB 120A to other electronic devices, and the like.

[0030] Processor 305 may be configured to execute multiple engines of gNB 120A. For example, these engines may include CSI engine 335. CAM engine 335 may perform operations including configuring the UE to perform CSI measurements and generate CSI reports for transmission to the gNB. Specific implementations of various scenarios are described in further detail below.

[0031] The engines described above are each represented as an application (e.g., a program) executed by the processor 305 and are merely exemplary. The functionality associated with the engines may also be represented as independently integrated components of the gNB 120A, or may be modular components coupled to the gNB 120A, such as integrated circuits with or without firmware. For example, an integrated circuit may include input circuits for receiving signals and processing circuits for processing signals and other information. In addition, in some gNBs, the functionality described for the processor 305 is split between multiple processors (e.g., a baseband processor, an application processor, etc.). The exemplary embodiments may be implemented in any of these or other configurations of the gNB.

[0032] The memory 310 may be a hardware component configured to store data related to operations performed by the UE 110, 112. The I / O device 320 may be a hardware component or port that enables a user to interact with the gNB 120A. The transceiver 325 may be a hardware component configured to exchange data with the UE 110, 112 and any other UE in the system 100, for example, when the gNB 120A is used as a PCell or SCell for either or both of the UEs 110, 112. The transceiver 325 may operate on a variety of different frequencies or channels (e.g., a set of continuous frequencies). Thus, the transceiver 325 may include one or more components (e.g., radio components) to enable data exchange with various networks and UEs.

[0033] 5G NR CSI Configuration

[0034] In Rel-15, channel state information (CSI) is reported by the UE to the gNB and may include some or all of the following information: CSI-RS resource index (CRI), rank indicator (RI), precoder matrix indicator (PMI), layer indicator (LI), and channel quality indicator (CQI). CSI may be reported by the physical uplink shared channel (PUSCH), the short physical uplink control channel (PUCCH), or the long PUCCH. When CSI is reported by PUSCH or long PUCCH, it is divided into two parts. The first part of the CSI (Part 1) may include CRI, RI, and / or CQI (CQI1) for the first codeword and has a fixed payload size. The second part of the CSI (Part 2) may include the remaining parts of the CSI that are not included in CSI Part 1, such as PMI, LI, and CQI (CQI2) for the second codeword, and may further include other subband PMI / CQI. The payload size of CSI Part 2 is determined by the content of CSI Part 1.

[0035] In Rel-17, CSI enhancement will support multi-TRP operation. In multi-TRP operation, the UE can receive the physical downlink shared channel (PDSCH) from multiple TRPs. To support multi-TRP operation, the UE can report CSI about non-coherent transmissions from multiple gNBs. Figure 4 A network arrangement 400 with a UE in multi-TRP operation is shown, where the UE can report CSI for each beam pair link only independently, i.e., a first CSI (CSI1) of a first beam pair link from a first TRP (TRP1) and a second CSI (CSI2) of a second beam pair link from a second TRP (TRP2). However, when multiple links are used for PDSCH transmission, a separate CSI corresponding to only one beam pair link cannot reflect the true channel quality.

[0036] The exemplary embodiments describe the configuration of the content of the reported CSI via the UL channel and the transmission scheme for the CSI. In the first step, the channel measurement resource (CMR) configuration and the interference measurement resource (IMR) configuration are determined. In the second step, the reporting amount of the CSI report is determined. In the third step, when the PUSCH / PUCCH reports the CSI, the multiplexing scheme is determined for the CSI report. Each of these steps will be described in further detail below according to various exemplary embodiments.

[0037] In a first exemplary embodiment, with respect to the first step described above, the UE may be configured to report CSI measured from a first gNB regarding interference from a second neighboring gNB. The CQI reported by the UE considers the neighboring gNB to be an interfering gNB. For example, if gNBs 120A and 120B are considered to be TRPs, UE 110 may be configured to measure CSI from gNB 120A when gNB 120B is considered to be an interfering gNB. Similarly, UE 110 may be configured to measure CSI from gNB 120B when gNB 120A is considered to be an interfering gNB. The gNB may generate a combined CQI based on two CSI reports received from the UE and measured from the two gNBs.

[0038] Figure 5 A diagram 500 is shown where for each channel measurement resource (CMR) (in this embodiment there are four CMRs), the gNB may configure N non-zero power based interference measurement resources (NZP-IMRs) (in this embodiment N=4) and one zero power based interference measurement resource (ZP-IMR). In the CSI reporting configuration, N may be the same for all CMRs, or alternatively, may be the same or different for all CMRs. The CMRs are used to measure the channel quality of the first gNB, and the IMRs are used to measure interference from the second gNB.

[0039] When PUSCH or long PUCCH is used to report CSI, various options are available regarding the reporting amount (the second step described above).

[0040] In a first reporting option of the first exemplary embodiment, the gNB may configure the UE to report a subset or all of the following information of the CSI report: CRI indicating the CSI-RS resource used for CSI measurement, NZP-IMR index indicating the NZP-IMR index used for CSI measurement, RI, PMI, LI, and CQI. The NZP-IMR may be selected from N IMRs associated with the CMR corresponding to the CRI. The UE may report M NZP-IMR indexes, where M is predefined (e.g., M=1) or configured by higher layer signaling.

[0041] In one embodiment, if N is the same for each CMR, the payload size of the NZP-IMR index remains the same for each CRI, and the NZP-IMR index may be transmitted in CSI part 1. For example, CSI part 1 may include CRI, NZP-IMR index, RI, and CQI1, while CSI part 2 may include LI, PMI, and CQI2 as well as other subband PMI / CQI.

[0042] In another embodiment, if N is different for each CMR, the payload size of the NZP-IMR index may be different for each CRI, and the NZP-IMR index may be transmitted in CSI part 2. For example, CSI part 1 may include CRI, RI, and CQI1, while CSI part 2 may include NZP-IMR index, LI, PMI, and CQI2 as well as other subband PMI / CQI.

[0043] In the second option for reporting (step 2), for the first exemplary embodiment, the gNB may configure the UE to report a subset or all of the following information for CSI reporting: CRI, RI, PMI, LI indicating the CSI-RS resources used for CSI measurement, and N CQIs for each NZP-IMR.

[0044] In one embodiment, if N is the same for each CMR, the payload size of CQI1 corresponding to each NZP-IMR remains the same for each CRI, and N CQIs may be transmitted in CSI part 1. For example, CSI part 1 may include CRI, RI, and N CQI1s, while CSI part 2 may include LI, PMI, and N CQI2s and other subband PMI / CQIs.

[0045] In another embodiment, if N is different for each CMR, the payload size of CQI1 corresponding to each NZP-IMR may be different for each CRI, and N CQI1s may be transmitted in CSI part 2. For example, CSI part 1 may include CRI and RI, while CSI part 2 may include LI, PMI, N CQI1s and N CQI2s, and other subband PMI / CQIs.

[0046] In the third option for reporting (step 2), for the first exemplary embodiment, the gNB may configure the UE to report a subset or all of the following information for the CSI report: CRI indicating the CSI-RS resources used for CSI measurement, and N RI / PM / LI / CQIs corresponding to each NZP-IMR.

[0047] In one embodiment, if N is the same for each CMR, the payload size of CQI1 corresponding to each NZP-IMR remains the same for each CRI, and N CQIs may be transmitted in CSI part 1. For example, CSI part 1 may include CRI and N CQI1s, while CSI part 2 may include N RIs, N LIs, N PMIs, and N CQI2s as well as other subband PMI / CQIs.

[0048] In another embodiment, if N is different for each CMR, the payload size of CQI1 corresponding to each NZP-IMR may be different for each CRI, and N CQI1s may be transmitted in CSI part 2. For example, CSI part 1 may include only CRI, while CSI part 2 may include N RIs, N LIs, N PMIs, N CQI1s, and N CQI2s as well as other subband PMI / CQIs.

[0049] When using short PUCCH to report CSI (step 2), for the first exemplary embodiment, all parameters of the CSI report of the various embodiments discussed above (sent in the two CSI parts for PUSCH or long PUCCH) can be transmitted together as one CSI, and the payload size of each element can be based on its maximum payload size. If the actual payload is less than the maximum payload size, padding can be used.

[0050] In a second exemplary embodiment, with respect to the first step discussed above, the UE may report CSI measured from two gNBs. The UE may assume that the two gNBs will operate based on multi-TRP for non-coherent transmissions. The reported CQI may be based on the CSI-RS from the two gNBs. In one embodiment, the gNB may configure two groups of CMRs for the UE. In another embodiment, each gNB may configure a group of CMRs, where each group of CMRs belongs to a different group, and the group ID of each CMR may be configured or determined by a scrambled ID configured by a higher layer.

[0051] Figure 6 A diagram 600 is shown configuring CMR groups for each of gNBs x and y. When N CMRs are indicated, the first group includes a first set of CMRs 1 to N, and the second group includes a second set of CMRs N+1 to N+N. For both options, the CMRs in each set / group indicate CSI-RS from different gNBs.

[0052] Regarding the reporting quantities (step 2 discussed above), various options are available. In a first option of the second exemplary embodiment, the gNB configures the UE to report a subset or all of the following information for CSI reporting: two CRIs (one CRI selected from each CMR group / group), two RI / PMI / LI (one for each CRI), and a CQI for each codeword based on the measurements of the two CRIs.

[0053] In a second option of the second exemplary embodiment, the gNB configures the UE to report a subset or all of the following information of the CSI report: two CRIs (one CRI selected for each CMR group), two RIs / PMIs (each corresponding to one CRI), a CQI for each codeword measured based on the two CRIs, and a LI selected based on the total number of layers indicated by the two RIs. If two codewords are reported, the LI is selected based on the total number of layers corresponding to the codeword with the highest CQI.

[0054] In a third option of the second exemplary embodiment, the gNB configures the UE to report a subset or all of the following information of the CSI report: two CRIs (one CRI selected from each CMR group) and two RI / PMI / LI / CQIs (each corresponding to one CRI).

[0055] For each of options 1-3 of the second exemplary embodiment, the total number of layers indicated by the two RIs shall not exceed the maximum number of layers configured by higher layer signaling or reported by UE capabilities. In one embodiment, the gNB may configure a restricted rank for each CMR group / group. The indication of the reported RI corresponding to the CMR group / group may be determined based on the rank restriction. For example, if the gNB configures the rank restriction as {0101}, implying that rank 2 and rank 4 are allowed, then RI=0 indicates rank 2 and RI=1 indicates rank 4.

[0056] In another implementation, the gNB may configure restricted rank across CMR groups. The total reported RI corresponding to the CMR group should not be equal to the restricted rank (e.g., rank 2). Figure 7 A diagram 700 of allowable configurations for RI parameters is shown.

[0057] For the first option above, when CSI is reported by PUSCH or long PUCCH, CSI part 1 may include 2 CRIs, 2 RIs and CQI1, while CSI part 2 may include LI, PMI and CQI2 and other sub-band PMI / CQI. For the second option above, when CSI is reported by PUSCH or long PUCCH, CSI part 1 may include 2 CRIs, 2 RIs and CQI1, while CSI part 2 may include LI, PMI and CQI2 and other sub-band PMI / CQI. For the third option above, when CSI is reported by PUSCH or long PUCCH, CSI part 1 may include 2 CRIs, 2 RIs and 2 CQI1, while CSI part 2 may include LI, PMI and 2 CQI2 and other sub-band PMI / CQI.

[0058] Additional options are available regarding reporting amounts. In a fourth option of the second exemplary embodiment, the gNB configures the UE to report a subset or all of the following information for the CSI report: two CRIs (each CRI is selected from each CMR group), one RI indicating the layer combination corresponding to the two CRIs, and two PMI / LI / CQIs (one corresponding to each CRI). In a fifth option of the second exemplary embodiment, the gNB configures the UE to report a subset or all of the following information for the CSI report: two CRIs (each CRI is selected from each CMR group), one RI indicating the layer combination corresponding to the two CRIs, one LI indicating the best layer among the total number of layers, and two PMI / CQIs (one corresponding to each CRI). In a sixth option of the second exemplary embodiment, the gNB configures the UE to report a subset or all of the following information for the CSI report: two CRIs (each CRI is selected from each CMR group), one RI / CQI indicating the layer combination corresponding to the two CRIs, one LI indicating the best layer among the total number of layers, and two PMIs (one corresponding to each CRI).

[0059] For each of the above options 4-6, the indication of RI may be determined by the rank restriction configured by higher layer signaling and the maximum number of layers supported by the UE. For example, if the rank restriction is configured as {0101}, the indication of RI may be as follows: RI=0: one layer for CRI1 and one layer for CRI2; RI=1: one layer for CRI1 and three layers for CRI2; RI=2: two layers for CRI1 and two layers for CRI2; RI=3: three layers for CRI1 and one layer for CRI2.

[0060] For the fourth option above, when CSI is reported by PUSCH or long PUCCH, CSI part 1 may include two CRIs, one RI and two CQI1s, while CSI part 2 may include LI, PMI and two CQI2s and other sub-band PMI / CQIs. For the fifth option above, when CSI is reported by PUSCH or long PUCCH, CSI part 1 may include two CRIs, one RI and two CQI1s, while CSI part 2 may include LI, PMI and CQI2 and other sub-band PMI / CQIs. For the sixth option above, when CSI is reported by PUSCH or long PUCCH, CSI part 1 may include two CRIs, one RI and one CQI1, while CSI part 2 may include LI, PMI and CQI2 and other sub-band PMI / CQIs.

[0061] For all options 1-6 described above, when CSI is reported by short PUCCH, all components of the CSI report may be transmitted together, where the payload size of each element may be based on its maximum payload size. If the actual payload size is less than the maximum payload size, padding may be used.

[0062] In a third exemplary embodiment, the best matching CSI feedback is considered. In the scenario where there are M1 CSI-RS resources for TRP1, M2 CSI-RS resources for TRP2, and optionally CSI-IM, the UE may generate a subset of the following reports.

[0063] The first report may include RI, CQI and optionally PMI. For the first report, the UE indicates one expected CSI-RS resource for CMRs from M1 CSI resources and one (or more) CSI-RS resources for NZP-CMRs from M2 CSI resources. The second report may include RI, CQI and optionally PMI. For the second report, the UE indicates one expected CSI-RS resource for CMRs from M2 CSI resources and one (or more) CSI-RS resources for NZP-CMRs from M1 CSI resources.

[0064] The third report may include RI, CQI and optionally PMI. For the third report, the UE indicates one desired CSI-RS resource for CMRs from M1 CSI resources and uses the configured / indicated CSI-IM for interference measurement. The fourth report may include RI, CQI and optionally PMI. For the fourth report, the UE indicates one desired CSI-0RS resource for CMRs from M2 CSI resources and uses the configured / indicated CSI-IM for interference measurement.

[0065] The number of CSI processing units (CPUs) used to generate the reports is X, where X>1. The UE may report only one of the four reports mentioned above. Even when X>1, the UE may need to calculate all reports and select one for reporting.

[0066] Figure 8A method 800 for configuring CSI reporting at a user equipment (UE) in a multiple transmission reception point (multi-TRP) configuration according to a first exemplary embodiment is shown. In 805, the UE performs channel state information (CSI) measurements for a channel measurement resource (CMR) of a first gNB and at least one interference measurement resource (IMR) of at least one second gNB. As described above, in the first exemplary embodiment, the second gNB in ​​the multi-TRP operation is considered to be an interfering gNB. The UE is configured with multiple NZP-IMRs and one ZP-IMR for each CMR and performs measurements on it for the interfering gNB.

[0067] In 810, the UE determines a configuration of a CSI report for CSI measurements including a channel quality indicator (CQI) measurement for a CMR and at least one IMR. According to the first exemplary embodiment discussed above, the CSI report may be configured differently depending on, for example, whether a PUSCH or a short / long PUCCH is configured for reporting the CSI.

[0068] In 815, the UE transmits the CSI report to the first gNB and at least one second gNB.

[0069] Fig. 9 A method 900 for configuring CSI reporting at a user equipment (UE) in a multiple transmission reception point (multi-TRP) configuration according to a second exemplary embodiment is shown. At 905, the UE performs channel state information (CSI) measurements for a first channel measurement resource (CMR) of a first gNB and a second CMR of at least one second gNB. As described above, in the second exemplary embodiment, the two gNBs are considered to perform non-coherent transmissions. A first group of CMRs is configured for the first gNB and a second group of CMRs is configured for the second gNB.

[0070] In 910, the UE determines a configuration of a CSI report of a CSI measurement including a channel quality indicator (CQI) measurement for each of the first CMR and the second CMR. According to the second exemplary embodiment discussed above, the CSI report may be configured differently depending on, for example, whether a PUSCH or a short / long PUCCH is configured for reporting the CSI.

[0071] In 915, the UE transmits the CSI report to the first gNB and at least one second gNB.

[0072] In 815 and 915 and in the other embodiments described above, it is indicated that the UE transmits the CSI report to the first gNB and at least one second gNB. In other embodiments, the CSI report may be transmitted to only one gNB. In this embodiment, the UE may assume that multiple gNBs (two or more) are cooperative. Therefore, the UE may then transmit the CSI to a single gNB, which may share the CSI report with other cooperating gNBs.

[0073] Those skilled in the art will appreciate that the exemplary embodiments described above may be implemented with any suitable software configuration or hardware configuration or combination thereof. Exemplary hardware platforms for implementing the exemplary embodiments may include, for example, Intel x86-based platforms with compatible operating systems, Windows OS, Mac platforms and MAC OS, mobile devices with operating systems such as iOS, Android, etc. In other examples, the exemplary embodiments of the above methods may be embodied as a program including lines of code stored on a non-transitory computer-readable storage medium, which, when compiled, may be executed on a processor or microprocessor.

[0074] Although this patent application describes various combinations of various embodiments each having different features, those skilled in the art will understand that any feature of an embodiment may be combined with features of other embodiments in any manner not publicly denied or with features that are not functionally or logically inconsistent with the operation or function of the device of the embodiments disclosed in the present invention.

[0075] It is understood that the use of personally identifiable information should be subject to privacy policies and practices that are generally recognized to meet or exceed industry or government requirements for maintaining user privacy. Specifically, personally identifiable information data should be managed and processed to minimize the risk of unintentional or unauthorized access or use, and the nature of the authorized use should be clearly stated to users.

[0076] It will be apparent to those skilled in the art that various modifications may be made to the present disclosure without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is intended to cover modifications and variations of the present disclosure, provided that these modifications and variations are within the scope of the appended claims and their equivalents.

Claims

1. A method for configuring a channel state information (CSI) report at a user equipment (UE) in a multiple transmission reception point (TRP) configuration, comprising: At a UE having simultaneous connections with a first next generation Node B (gNB) and at least one second gNB on the same carrier in a multi-TRP configuration: Perform CSI measurement on a first channel measurement resource CMR of the first gNB, a second CMR of the at least one second gNB, and at least one interference measurement resource IMR of the at least one second gNB, wherein M1 CSI reference signal CSI-RS resources correspond to a first TRP of the first gNB, and M2 CSI-RS resources correspond to a second TRP of the second gNB; and determining a configuration of a CSI report for the CSI measurement, wherein determining the configuration of the CSI report comprises selecting a CSI report from a plurality of CSI reports, the plurality of CSI reports comprising: A first CSI report, wherein the first CSI report includes a first rank indicator RI, a first channel quality indicator CQI and a first precoding matrix indicator PMI, wherein the UE indicates one desired CSI-RS resource for CMR from the M1 CSI-RS resources and one or more CSI-RS resources for CMR with non-zero power from the M2 CSI-RS resources, a second CSI report, the second CSI report comprising a second RI, a second CQI and a second PMI, wherein the UE indicates one desired CSI-RS resource for CMR from the M1 CSI-RS resources and performs a first interference measurement using the IMR, and a third CSI report, the third CSI report comprising a third RI, a third CQI, and a third PMI, wherein the UE indicates one desired CSI-RS resource for CMR from the M2 CSI-RS resources, and performs a second interference measurement using the IMR; and The CSI report is transmitted to at least one of the first gNB and the at least one second gNB.

2. The method according to claim 1, wherein the CSI measurement is performed for a first CMR group and a second CMR group, the first CMR group includes N first CMRs for the first gNB, and the second CMR group includes N second CMRs for the second gNB. The method according to claim 2 , wherein each CMR group is associated with a group identifier (ID).

4. A processor, the processor being configured to execute the method according to any one of claims 1 to 3.

5. A user equipment UE, comprising the processor according to claim 4.

6. A computer program product comprising instructions which, when executed by a processor, cause the processor to perform the steps of the method according to any one of claims 1 to 3.

7. A computer-readable storage medium comprising instructions, which, when executed by a processor, cause the processor to perform the steps of the method according to any one of claims 1 to 3.

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