Terminal device, network device and method thereof

Abstract

The embodiments of the present disclosure provide a solution for CSI reporting. In a communication method, a terminal device receives one or more settings for at least one of a first Channel State Information (CSI), a second CSI, or a third CSI in a CSI reporting setting. The one or more settings in the CSI reporting setting include at least one of at least two rank restrictions or at least two codebook subset restrictions (CBSRs). The terminal device transmits at least one of the first CSI, the second CSI, or the third CSI to a network device based on the one or more settings.

Description

[Technical field]

[0001] TECHNICAL FIELD Embodiments of the present disclosure relate generally to the field of communications, and more specifically, to solutions for Channel State Information (CSI) reporting. [Background technology]

[0002] 5G New Radio (NR) is the global standard for a unified, higher-performance 5G wireless air interface. 5G enables a new kind of network designed to connect nearly everyone and everything together, including machines, things, and devices. Multiple-Input and Multiple-Output (MIMO) technology is a method for increasing the capacity of a radio link by using multiple transmit and receive antennas to exploit multipath propagation. MIMO includes features that facilitate the use of a large number of antenna elements at base stations (BSs) below and above 6 GHz. In the 3rd Generation Partnership Project (3GPP) Release 17 (Rel-17), a further enhanced MIMO (FeMIMO) technology was introduced to improve the management of beamforming and beamsteering and reduce the associated overhead. Additionally, in Rel-17, a work item description (WID) on FeMIMO in NR was already agreed to to enhance CSI measurement and reporting for multiple transmission / reception points (TRPs).

[0003] With regard to CSI measurements associated with CSI reporting settings for non-coherent joint transmission (NCJT), it has been found that non-zero-power (NZP) Channel State Information Reference Signal (CSI-RS) resources for channel measurements should be associated with different TRP / Transmission Configuration Indication (TCI) states at resource level (at least for multiple Downlink Control Indication (DCI) based schemes and single DCI based schemes).

[0004] However, there is no suitable solution for CSI reporting, especially for multi-TRP transmission, and as a result, it is still not possible to benefit from it. Therefore, there is a need for an improved solution for CSI reporting in NR systems. Summary of the Invention [Problem to be solved by the invention]

[0005] Overall, the embodiments of the present disclosure provide a solution for CSI reporting. [Means for solving the problem]

[0006] In a first aspect, a communication method is provided. The method includes receiving, in a terminal device, one or more configurations for at least one of a first Channel State Information (CSI), a second CSI, or a third CSI in a CSI reporting setting. The one or more configurations in the CSI reporting setting include at least one of at least two rank restrictions or at least two codebook subset restrictions (CBSRs). The method further includes transmitting, to a network device, at least one of the first CSI, the second CSI, or the third CSI based on the one or more configurations.

[0007] In a second aspect, a communication method is provided. The method includes transmitting, in a network device, one or more configurations for at least one of a first channel state information (CSI), a second CSI, or a third CSI within a CSI reporting setting. The one or more configurations within the CSI reporting setting include at least one of at least two rank restrictions or at least two codebook subset restrictions (CBSRs). The method further includes receiving, in a network device, at least one of the first CSI, the second CSI, or the third CSI based on the one or more configurations.

[0008] In a third aspect, there is provided a terminal device, the terminal device comprising a processor configured to execute the method according to the first aspect.

[0009] In a fourth aspect, there is provided a first network device, said network device comprising a processor configured to perform the method according to the second aspect.

[0010] In a fifth aspect, there is provided a computer readable medium having stored thereon instructions which, when executed on at least one processor of an apparatus, cause the apparatus to perform a method according to the first aspect.

[0011] In a sixth aspect, there is provided a computer readable medium having stored thereon instructions which, when executed on at least one processor of an apparatus, cause the apparatus to perform a method according to the second aspect.

[0012] It should be understood that this summary is not intended to identify key or essential features of the embodiments of the present disclosure, nor to limit the scope of the present disclosure. Other features of the present disclosure will be readily apparent from the following description. [Brief description of the drawings]

[0013] The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description of several embodiments of the present disclosure in the drawings.

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[0027] In the drawings, the same or similar reference numbers represent the same or similar elements. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] The principles of the present disclosure will now be described with reference to some embodiments. It should be understood that these embodiments are provided for illustrative purposes only, to assist those skilled in the art in understanding and implementing the present disclosure, and do not imply any limitations on the scope of the present disclosure. The disclosure described herein can be implemented in various ways different from those described below.

[0029] In the following description and claims, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains.

[0030] The term "network equipment" or "base station" (BS) as used herein means equipment capable of providing or hosting a cell or coverage within which terminal equipment can communicate. Examples of network equipment include, but are not limited to, Node B (NodeB or NB), evolved Node B (eNodeB or eNB), next generation Node B (gNB), infrastructure equipment for V2X (vehicle-to-everything) communications, transmit / receive points (TRP), remote radio units (RRU), radio heads (RH), remote radio heads (RRH), femto nodes, pico nodes, and other low power nodes.

[0031] As used herein, the term "terminal device" refers to any device having wireless or wired communication capabilities. Examples of terminal devices include, but are not limited to, user equipment (UE), personal computers, desktop computers, mobile phones, cellular phones, smartphones, personal digital assistants (PDAs), portable computers, tablets, wearable devices, Internet of Things (IoT) devices, any Internet of Things (IoE) devices, machine type communication (MTC) devices, in-vehicle devices for V2X communication, etc., where the "X" in V2X represents a pedestrian, vehicle or infrastructure / network, or an image capture device such as a digital camera, a gaming device, a music storage and playback device, or an Internet appliance that allows wireless or wired Internet access and browsing, etc. For purposes of explanation, some embodiments will be described below with reference to a UE as an example of a terminal device, and the terms "terminal device" and "user equipment" (UE) may be used interchangeably in the context of this disclosure.

[0032] In some embodiments, the terminal device may be connected to a first network device and a second network device. One of the first network device and the second network device may be a master node and the other may be a secondary node. The first network device and the second network device may use different radio access technologies (RATs). In some embodiments, the first network device may be a first RAT device and the second network device may be a second RAT device. In some embodiments, the first RAT device is an eNB and the second RAT device is a gNB. Information regarding the different RATs may be transmitted to the terminal device from at least one of the first network device and the second network device. In some embodiments, the first information may be transmitted from the first network device to the terminal device and the second information may be transmitted from the second network device to the terminal device directly or via the first network device. In some embodiments, information regarding the configuration of the terminal device configured by the second network device may be transmitted from the second network device via the first network device. The information regarding the reconfiguration of the terminal device set by the second network device can be sent from the second network device directly or via the first network device to the terminal device, and may be sent via any of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) control element (CE), or Downlink Control Information (DCI).

[0033] The term "circuitry" as used herein can refer to hardware circuits and / or a combination of hardware circuits and software. For example, a circuit may be a combination of analog and / or digital hardware circuits and software / firmware. As yet another example, a circuit may be any portion of a hardware processor having software, including a digital signal processor, software, and one or more memories, that cooperate to cause a device, such as a terminal device or a network device, to perform various functions. In yet another example, a circuit may be a hardware circuit and / or a processor, such as a microprocessor or a portion thereof, that requires software / firmware for operation, but the software may not be present if not required for operation. As used herein, the term "circuitry" also includes implementations of only a hardware circuit or one or more processors, or a portion of a hardware circuit or one or more processors, and its (or their) associated software and / or firmware.

[0034] As used herein, the terms "transmission / reception point", "transmission / reception point", or "transmission and reception point" may generally refer to a station that communicates with user equipment. However, a transmission / reception point may be referred to by different terms, such as a base station (BS), cell, Node B, evolved Node B (eNB), next generation Node B (gNB), transmission / reception point (TRP), sector, site, base transceiver station (BTS), access point (AP), relay node (RN), remote radio head (RRH), radio unit (RU), antenna, etc.

[0035] That is, in the context of this disclosure, a transmission / reception point, a base station (BS) or a cell can be interpreted as a generic concept indicating a part of an area or function covered by a base station controller (BSC) in code division multiple access (CDMA), a Node-B in WCDMA, an eNB or sector (site) in LTE, a gNB or TRP in NR, etc. Thus, the concept of a transmission / reception point, a base station (BS) and / or a cell can include various coverage areas such as a mega cell, a macro cell, a micro cell, a pico cell, a femto cell, etc. Furthermore, this concept can include the communication range of a relay node (RN), a remote radio head (RRH), or a radio unit (RU).

[0036] In the context of this disclosure, the user equipment and the transmission / reception point may be two transmission / reception entities having a generic meaning for embodying the techniques and technical concepts disclosed herein, and may not be limited to a specific term or word. Furthermore, the user equipment and the transmission / reception point may be an uplink or downlink transmission / reception entity having a generic meaning for embodying the techniques and technical concepts disclosed in connection with this disclosure, and may not be limited to a specific term or word. As used herein, uplink (UL) transmission / reception is the manner in which data is transmitted from the user equipment to the base station. Alternatively, downlink (DL) transmission / reception is the manner in which data is transmitted from the base station to the user equipment.

[0037] As used herein, the terms "resource", "transmission resource", "resource block", "physical resource block", "uplink resource", or "downlink resource" may refer to any resource for performing communication, such as communication between a terminal device and a network device, such as a resource in the time domain, a resource in the frequency domain, a resource in the spatial domain, a resource in the code domain, or any other resource enabling communication. In the following, resources in both the frequency domain and the time domain are used as examples of transmission resources to explain some embodiments of the present disclosure. It should be noted that the embodiments of the present disclosure may be applied to other resources in other domains as well.

[0038] As used herein, the singular forms "a," "an," and "said" include the plural forms unless the context clearly indicates otherwise. The term "comprises" and variations thereof should be understood as open-ended terms meaning "including, but not limited to." The term "based on" should be understood as "based at least in part on." The terms "one embodiment" and "embodiment" should be understood as "at least one embodiment." The term "another embodiment" should be understood as "at least one other embodiment." Terms such as "first," "second," and the like can refer to different or the same object. The following may include other explicit and implicit definitions.

[0039] In some instances, values, procedures, or devices are referred to as "best," "lowest," "highest," "minimum," "maximum," etc. It will be understood that such descriptions are intended to illustrate that selections can be made from among many functional alternatives used, and that such selections are not necessarily better, smaller, higher, or otherwise more preferred than other selections.

[0040] As mentioned above, in 3GPP Rel-17, WID for FeMIMO in NR has already been agreed to enhance CSI measurement and reporting for multi-transmission points (multi-TRP). For CSI measurement associated with CSI reporting settings for NCJT, it was decided that NZP CSI-RS resources for channel measurement should be associated with different TRP / TCI states at resource level (at least for multi-DCI and single-DCI based schemes). For CSI reporting associated with multi-TRP / panel NCJT measurement hypothesis configured with single CSI reporting setting, for single-DCI based NCJT when maximum transmission layer is 4 or less, UE is expected to report 2 RI, 2 precoding matrix indices (PMI), 2 layer indices (LI), and 1 CQI per codeword.

[0041] Additionally, for CSI reporting, there may be three alternative options of CSI reporting mechanism: For alternative option 1, if configured, the UE is expected to report one CSI associated with the best single TRP measurement hypothesis and one CSI associated with the best NCJT measurement hypothesis. For alternative option 2, if configured, the UE may be expected to report one CSI associated with the best of the NCJT and / or single TRP measurement hypotheses. For alternative option 3, if configured, the UE may be expected to report two CSIs associated with the two best single TRP measurement hypotheses associated with Channel Measurement Resources (CMRs) from two TRPs and one CSI associated with the best NCJT measurement hypothesis.

[0042] In the radio access network RAN1#103e, for NCJT CSI measurements configured to have a single reporting setting, it was agreed to consider a number of measurement resource configuration / association mechanisms, such as whether / how to support interference measurements based on NZP CSI-RS given by nzp-CSI-RS-ResourcesForInterference or CSI-Interference Measurement (IM) given by csi-IM-ResourcesForInterference, NCJT measurement hypotheses, CMR / IM resource (IMR) resource configuration restrictions / association, e.g. whether / how to interpret measurements based on CMR associated with different TRP / TCI states respectively for reference resources / time domain behavior / frequency domain behavior.

[0043] In the current NR system, a CSI-RS resource indicator (CRI) is used to indicate a selected CSI-RS resource from multiple CSI-RS resource NZP CSI-RS resource sets configured for CSI reporting. The bit width of the CRI is determined based on the number of CSI-RS resources in the corresponding resource set and the transmission codebook subset, and the RI may be limited to reduce computational complexity and signaling overhead. However, the above solutions in the current NR system are not suitable for multi-TRP NCJT scenarios, and there is no suitable design for CRS reporting or CSI reporting settings in the existing solutions.

[0044] To solve the above-mentioned technical problems and other potential technical problems in the conventional solutions, the embodiments of the present disclosure provide a solution for CSI reporting. In some embodiments, a terminal device receives one or more configurations for at least one of a first CSI, a second CSI, or a third CSI in a CSI reporting setting, the one or more configurations in the CSI reporting setting including at least one of at least two rank restrictions or at least two codebook subset restrictions (CBSRs). The terminal device transmits at least one of the first CSI, the second CSI, and the third CSI to a network device based on the one or more configurations in a CSI report.

[0045] According to embodiments of the present disclosure, one or more additional CSI are further introduced to support CSI feedback for multi-TRP NCJT scenarios or to support dynamic transmission, and additionally or alternatively, new solutions for RI restriction and / or CBSR restriction are also proposed to further reduce computational complexity and system overhead.

[0046] The solution proposed in the present disclosure will be described in detail below with further reference to the accompanying drawings. However, it should be understood that the following embodiments are given for illustrative purposes only, and the present disclosure is not limited thereto. In addition, the solution provided herein can be used in NR systems or any other communications having similar problems.

[0047] 1 is a schematic diagram of a communication environment 100 in which some embodiments of the present disclosure can be implemented. As shown in FIG. 1, the communication environment 100 (which may also be referred to as a communication network 100 or a communication system 100) includes a first TRP 110 (TRP 1), a second TRP 120 (TRP 2), and a terminal device 130. Specifically, the terminal device 130 may communicate with the first TRP 110 and the second TRP 120 via a communication link. The communication link may be referred to as a downlink in the case of transmission from the TRP 110, 120 to the terminal device 120, and as an uplink in the case of transmission from the terminal device 130 to the TRP 110, 120.

[0048] The communication environment 100 may conform to any suitable standard, including, but not limited to, Global System for Mobile Communications (GSM), Long Term Evolution (LTE), LTE-Evolution, LTE-Advanced (LTE-A), Wideband Code Division Multiple Access (WCDMA), Code Division Multiple Access (CDMA), GSM EDGE Radio Access Network (GERAN), Machine Type Communications (MTC), etc. Furthermore, communications may be performed according to any generation of communication protocols now known or developed in the future. Examples of communication protocols include, but are not limited to, first generation (1G), second generation (2G), 2.5G, 2.75G, third generation (3G), fourth generation (4G), 4.5G, and fifth generation (5G) communication protocols.

[0049] A network 100 (e.g., a gNB) may include one or more TRPs or antenna panels. As used herein, the term "TRP" refers to an antenna array (having one or more antenna elements) available to a network device located at a particular geographic location. For example, a network device may be coupled to multiple TRPs in different geographic locations to achieve better coverage. The one or more TRPs may be included in the same serving cell or different serving cells.

[0050] It should be understood that a TRP may be a panel, and a panel may also refer to an antenna array (having one or more antenna elements). Although several embodiments of the present disclosure have been described with reference to multiple TRPs as examples, these embodiments are for illustrative purposes only and are intended to assist those skilled in the art in understanding and implementing the present disclosure, and do not imply any limitations on the scope of the present disclosure. It should be understood that the contents of the present disclosure described herein can be implemented in various ways different from those described below.

[0051] In the exemplary scenario illustrated in FIG. 1, the environment 100 supports transmission from a single TRP, e.g., the first TRP 110 or the second TRP 120, to the terminal device 130, which may also be referred to as a single-TRP transmission. Additionally, the terminal device 130 may also receive transmissions from multiple network devices, e.g., both the first and second network TRPs 110, 120, simultaneously, which may also be referred to as a multi-TRP transmission. In some embodiments of the present disclosure, the two TRPs 110, 120 may be included in the same network device. In some embodiments of the present application, the TRPs may be included in two different network devices.

[0052] As shown in FIG. 1, for example, the environment 100 may communicate with the terminal device 130 via at least one of the TRP 110 and the TRP 120. The TRP 110 and the TRP 120 may be included in the same serving cell or different serving cells. Although some embodiments of the present disclosure have been described with reference to the TRP 110 and the TRP 120 in the same serving cell, these embodiments are for illustrative purposes only and are intended to assist those skilled in the art in understanding and implementing the present disclosure, and do not imply any limitation on the scope of the present disclosure. It should be understood that the contents of the present disclosure described herein can be implemented in various ways different from the way described below.

[0053] The network device requires the channel state information for transmission scheduling or transmission parameter selection or configuration. The network device transmits a configuration for CSI reporting to the terminal device 130 in a CSI reporting setting, for example, via radio resource control (RRC) signaling. Based on the configuration in the CSI reporting setting, the terminal device 130 performs measurements, such as channel measurements and / or interference measurements, and transmits a CSI report to the network device.

[0054] Embodiments of the present disclosure may be applied to CSI reporting and CSI reporting settings in a communication environment 100, which will be described in more detail below with reference to FIGS.

[0055] 2 is a flow chart of an example method 200 for communication in accordance with an embodiment of the present disclosure. The communication method 200 may be performed in a terminal device, such as a UE 130.

[0056] 2, in block 210, a terminal device may receive one or more configurations for at least one of a first channel state information (CSI), a second CSI, or a third CSI in a CSI reporting setting. The one or more configurations in the CSI reporting setting may include at least one of at least two rank restrictions or at least two codebooks. In block 220, the terminal device may transmit at least one of the first CSI, the second CSI, or the third CSI to a network device based on the one or more configurations.

[0057] Hereinafter, the CSI reporting setting and solutions regarding CSI reporting will be described in detail with reference to FIGS.

[0058] FIG. 3 is a schematic diagram of a CSI report according to an embodiment of the present disclosure. As shown in FIG. 3, in some embodiments of the present disclosure, N (N is a positive integer, e.g., 2≦N≦64) CSI-RS resources may be in a CSI-RS resource set, and each CSI-RS resource may be associated with one transmission configuration indicator (TCI) state. For example, the TCI state is configured via at least one of RRC, MAC CE, and DCI signaling, including the configuration of a quasi-co-location relationship. In some embodiments, the N CSI-RS resources may be divided into two subsets (subset A and subset B). Subset A may include, for example, N1 (N is a positive integer, e.g., 1≦N1≦N-1) CSI-RS resources, and subset B may include N2 (N is a positive integer, e.g., N=N-N1) CSI-RS resources. For example, N1 CSI-RS resources in subset A are resources for CSI measurements related to TRP 1, and N2 CSI-RS resources in subset B are resources for CSI measurements related to TRP 2.

[0059] The CSI-RS resources may be mapped to subset A and subset B in different manners. In some embodiments of the present disclosure, subset A and subset B each include half of the CSI-RS resources. For example, subset A includes the first half of the CSI-RS resources and subset B includes the second half of the CSI-RS resources. For example, N1=ceil(N / 2) and N2=N-N1. For another example, N1=floor(N / 2), N2=N-N1. For another example, N1=N / 2, N2=N / 2. In some embodiments of the present disclosure, it is also possible to maintain a resource list for each of subset A and subset B. For example, a list of CSI-RS resources is maintained for subset A and another list of CSI-RS resources is maintained for subset B. In such a case, the number of CSI-RS resources in subset A may be the same as or different from the number of CSI-RS resources in subset B.

[0060] In some embodiments of the present disclosure, a CSI report may have three CSIs, including, for example, CSI A, CSI B, and CSI C. Of the three CSIs, CSI A and / or CSI B may be CSIs for single TRP transmission. For example, they may be associated with two TRPs, respectively. CSI C may be a CSI used for an NCJT scenario.

[0061] It should be noted that in the CSI reporting example, at least one of CSI A, CSI B, and CSI C may be included depending on the network configuration or requirements. For example, in the case of single TRP transmission, the terminal device may report only the best CSI among the CSIs for TRP 1 and TRP 2, or may report both the best CSI for TRP 1 and the best CSI for TRP 2. Alternatively, the CSI reporting may include CSI C for the NCJT scenario. Or, additionally, the CSI reporting may include CSI C for the NCJT scenario in addition to one or both of CSI A and CSI B. The CSI reporting setting from the network device may include a setting for at least one CSI, for example, at least one of CSI A, CSI B, and CSI C. Hereinafter, the reporting of CSI A, CSI B, and CSI C will be described in detail with reference to the accompanying drawings.

[0062] CSI A / B for single TRP transmission In some embodiments herein, a CSI report may include one or both of CSI A and CSI B. For example, a CRI for only one of CSI A and / or CSI B may be reported (e.g., for a single TRP transmission), and the CRI may correspond to one CSI-RS resource in the CSI-RS resource set. In some embodiments herein, a CSI is determined from N CSI-RS resources in the CSI-RS resource set, and only the CSI, e.g., CSI A or CSI B, is reported.

[0063] 4, in some embodiments, CSI A may include at least one of one CRI (first CRI CRI_1), one PMI (first PMI PMI_1), and one RI (first RI RI_1). In some embodiments, CSI B may include at least one of one CRI (second CRI CRI_2), one PMI (second PMI PMI_2), and one RI (second RI RI_1). In some embodiments, the bit size for the CRI in CSI A or CSI B may be determined as ceil(log2(N)). In some embodiments, the bit size for the CRI in CSI A or CSI B may be determined as ceil(log2(max(N1,(N-N1))). For example, in a CSI reporting setting, there may be a setting for only one CSI with one CRI, and this setting may be applicable to CSI A or CSI B. Alternatively, the CSI reporting setting may include two CSIs, with one CRI each applied to CSI A and CSI B.

[0064] CSI C for multi-TRP transmission In some embodiments of the present application, CSI C (e.g., for an NCJT scenario) may include two CRIs (a first CRI CRI_3 and a second CRI CRI_4), two RIs (a first RI RI_3 and a second RI RI_4), and two PMIs (a first PMI PMI_3 and a second PMI PMI_4), as shown in FIG. 4. CRI_3 may correspond to a CSI-RS resource (C1) in subset A, and CRI_4 may correspond to a CSI-RS resource (C2) in subset B. For example, PMI_3 may be calculated based on C1 as a channel measurement resource (CMR) and / or based on C2 as an interference measurement resource (IMR), and PMI_4 may be calculated based on C2 as a CMR and / or based on C1 as an IMR. In this case, the bit size for CRI_3 may be determined as ceil(log2(N1)), and the bit size for CRI_4 may be determined as ceil(log2(N-N1)).

[0065] FIG. 5 illustrates another solution for CSI reporting according to an embodiment of the present application. As shown in FIG. 5, similarly, a CSI-RS resource set includes N (N is a positive integer, e.g., 2≦N≦64) CSI-RS resources, and each CSI-RS resource is associated with one TCI state. The N CSI-RS resources may be divided into two subsets (subset A and subset B), where subset A includes N1 (N is a positive integer, e.g., 1≦N1≦N-1) CSI-RS resources, and subset B includes N2 (N is a positive integer, e.g., N2=N-N1) CSI-RS resources. There are M (M is a positive integer, e.g., 1≦M≦N1. For another example, 1≦M≦max(N1,(N-N1))) CSI-RS resources (S1) in subset B that are associated with M CSI-RS resources (S2). For example, each CSI-RS resource in S1 is associated with one CSI-RS resource in S2. In other words, a correlation is established between two CSI_RS resources in each of the M pairs of CSI_RS resources for subset A and subset B. This correlation may reduce the computational complexity of CSI measurements and / or the overhead of CSI reporting.

[0066] In some embodiments, the CSI reporting setting may include at least one CSI, e.g., at least one of CSI A, CSI B, and CSI C. For CSI A and / or CSI B (e.g., for single TRP transmission), the CSI reporting may be the same as described with reference to FIG. 3, i.e., may include at least one of one CRI, one PMI, and one RI. In particular, for each CSI, one CRI is reported, which corresponds to a CSI-RS resource in a CSI-RS resource set. Unlike the CSI reporting as shown in FIG. 3, in which two CRIs are reported for CSI C (e.g., for NCJT assumption), it is possible to report only one CRI for CSI C, which corresponds to both CSI-RS resources in subset A and associated CSI-RS resources in subset B. In the following, the reporting of CSI A, CSI B, and CSI C will be described in detail.

[0067] CSI A / B for single TRP transmission In some embodiments of the present disclosure, only one of CSI A and CSI B may be reported (e.g., for a single TRP transmission). For example, the CSI is determined from N CSI-RS resources in a CSI-RS resource set, and only one of CSI A or CSI B is reported. In some embodiments, the bit size for the CRI in CSI A or CSI B may be determined as ceil(log2(N)). In some embodiments, the bit size for the CRI in CSI A or CSI B may be determined as ceil(log2(max(N1,(N-N1))). In some embodiments, the CSI reporting setting may include a setting for only one CSI with one CRI. For example, when only one of CSI A or CSI B is present (e.g., for a single TRP transmission).

[0068] In some embodiments of the present disclosure, both CSI A and CSI B may be reported (e.g., for a single TRP transmission). In some embodiments, the bit size for the CRI in CSI A may be determined as ceil(log2(N1)), and the bit size for the CRI in CSI B may be determined as ceil(log2(N-N1)). In some embodiments, the bit size for the CRI in CSI A may be determined as ceil(log2(N)), and the bit size for the CRI in CSI B may be determined as ceil(log2(N)). In some embodiments, the bit size for the CRI in CSI A may be determined as ceil(log2(max(N1,(N-N1))), and the bit size for the CRI in CSI B may be determined as ceil(log2(max(N1,(N-N1))). For example, in such a case, the CSI reporting setting may include settings for two CSIs, each with one CRI.

[0069] In some embodiments of the present application, the bit size for the CRI in CSI A may be determined as ceil(log2(N-M)), and the bit size for the CRI in CSI B may be determined as ceil(log2(N-N-M)). For example, M pairs of the CSI-RS cannot be used for a single TRP transmission. In such a case, the CSI reporting setting may include settings for two CSIs with one CRI each.

[0070] CSI C for multi-TRP transmission If there are M associated CSI-RS resource pairs in subset A and subset B, it is possible to report only one CRI for CSI C (e.g., for an NCJT scenario). As shown in FIG. 6, only one CRI CRI_3′ may be reported for a multi-TRP transmission, and CRI CRI_3′ may correspond to both one CSI-RS resource in S1 and the associated CSI-RS resource in S2. In some embodiments, the bit size for CRI in CSI C may be determined as ceil(log2(M)).

[0071] In some embodiments, CSI C may further include two PMIs PMI_3, PMI_4 and / or two RIs RI_3, RI_4. For example, PMI_3 / RI_3 may be determined based on CSI-RS resources corresponding to CRIs in S1, and PMI_4 / RI_4 may be determined based on CSI-RS resources corresponding to CRIs in S2.

[0072] FIG. 7 illustrates another solution for CSI reporting according to an embodiment of the present application, where two CSI-RS resources in different subsets are associated in different ways for multi-TRP transmission. In some embodiments, as illustrated in FIG. 7, a CSI-RS resource set includes, for example, N (N is a positive integer, e.g., 2≦N≦64) CSI-RS resources and is divided into two groups G1 and G2. Group G1 has N1 (N1 is an integer, 2≦N1≦N) CSI-RS resources, each of which is associated with two TCI states. Group G2 has N2 (e.g., N2=N−N1) CSI-RS resources, each of which is associated with one TCI state. In group G1, CSI-RS resources associated with the same two TCI states are considered to be a pair of CSI-RS resources and are associated with each other. For example, this pair of two CSI-RS resources can be used for an NCJT scenario.

[0073] Alternatively, in some embodiments, group G1 may have N3 (N3 is an integer and 1≦N3≦floor(N / 2)) pairs of CSI-RS resources, with each CSI-RS resource in a resource pair associated with two TCI states, as shown in Figure 8. In such a case, N3=N1 / 2 or N1=2*N3, and group G1 includes N2 (N2=N-2*N3) CSI-RS resources.

[0074] In some embodiments of the present disclosure, the CSI reporting settings may include configuration for at least one CSI, e.g., at least one of CSI A, CSI B, and CSI C. For each of CSI A or CSI B (e.g., for a single TRP transmission), at least one of one CRI, one PMI, and one RI may be reported, where the CRI may correspond to one CSI-RS resource associated with one TCI state in the CSI-RS resource set. For CSI C (e.g., the NCJT hypothesis), one CRI, two PMIs, and two RIs may be reported, where the CRI may correspond to two CSI-RS resources or one pair of CSI-RS resources associated with the same two TCI states in G1. The following describes the reporting of CSI A, CSI B, and CSI C in detail.

[0075] CSI A / B for single TRP transmission In some embodiments of the present disclosure, the CSI reporting setting includes a configuration for only one CSI with one CRI. For example, the CSI-RS resources in G1 are dedicated to multi-TPR transmissions, and the CSI-RS resources in G2 are dedicated to single-TPR transmissions. In some embodiments, the bit size for the CRI in CSI A or CSI B may be determined as ceil(log2(N-N1)). For example, the CSI reporting includes only one of CSI A and CSI B. For another example, the CSI reporting further includes CSI C.

[0076] In some embodiments of the present disclosure, the CSI reporting setting may include a setting for only one CSI with one CRI. For example, CSI-RS resources in G1 may be dedicated for multi-TPR transmission, while CSI-RS resources in both G1 and G2 may be used for single-TPR transmission. In some embodiments, one of the two TCI states may be used for channel measurement for CSI A or CSI B if the corresponding CSI-RS resource is associated with two TCI states. For example, the first of the two TCI states may be applied. For another example, there may be two CSI-RS associated with the same two TCI states, and for the first CSI-RS resource, the first of the two TCI states may be used, and for the second CSI-RS resource, the second of the two TCI states may be used. In some embodiments, the bit size for the CRI in CSI A or CSI B may be determined as ceil(log2(N)). For example, only one of CSI A and CSI B is included in the CSI report. For another example, the CSI report further includes CSI C.

[0077] In some embodiments of the present disclosure, the CSI reporting settings may include settings for two CSIs each having one CRI, and in such a case, both CSI A and CSI B may be reported. In some embodiments, the bit size for the CRI in CSI A or CSI B is ceil(log2(N-N1)). For example, a single TPR transmission may use only CSI-RS resources in G2. In some embodiments, the bit size for the CRI in CSI A or CSI B is ceil(log2(N)). For example, a single TPR transmission may be able to use all resources in the CSI-RS resource set. In some embodiments, one of the two TCI states may be used for channel measurements for CSI A or CSI B if the corresponding CSI-RS resource is associated with two TCI states. For example, the first of the two TCI states may be applied. For another example, there may be two CSI-RS associated with the same two TCI states, and for a first CSI-RS resource, the first of the two TCI states may be used, and for a second CSI-RS resource, the second of the two TCI states may be used.

[0078] CSI C for multi-TRP transmission In some embodiments, CSI C (e.g., for the NCJT assumption) may include one CRI CRI_3 and / or two PMIs PMI_3, PMI_4 and / or two RIs RI_3, RI_4, e.g., for association of CSI-RS resources in G1. As shown in FIG. 9, CRI_3 may correspond to two CSI-RS resources in the set of CSI-RS resources G1 that are associated with the same two TCI states. In some embodiments, the bit size for CRI in CSI C may be determined as ceil(log2(N1 / 2)) or ceil(log2(N3)).

[0079] In some embodiments, each value of CRI may correspond to a first CSI-RS resource of two CSI-RS resources associated with the same two TCI states. For example, for CSI-RS resources with the same two TCI states, only the first CSI-RS resource is counted in the CRI index and the second CSI-RS resource is not counted in the CRI index determination. In some embodiments, the values ​​of CRI are associated with an ascending order of CSI-RS resources, where the CSI-RS resources are associated with two different TCI states.

[0080] As an example, there are four CSI-RS resources in G1: CSI-RS resource Re1 (TCI state T1, T2), CSI-RS resource Re2 (TCI state T1, T2), CSI-RS resource Re3 (TCI state T3, T4), and CSI-RS resource Re4 (TCI state T3, T4). Of these four resources, the first CSI-RS resource Re1 is associated with the second CSI-RS resource Re2 having the same TCI state T1, T2, and the third CSI-RS resource Re3 is associated with the fourth CSI-RS resource Re4 having the same TCI state T3, T4. In this case, only CSI-RS resource Re1 in the first pair of associated CSI-RS resources and CSI-RS resource Re3 in the second pair of associated CSI-RS resources are counted in the CRI index. For example, for a first pair of associated CSI-RS resources Re1 and Re2, the CRI may be determined as CRI=0, for a second pair of associated CSI-RS resources Re3 and Re4, the CRI may be determined as CRI=1, and so on.

[0081] As another example, there are four CSI-RS resources in G1: CSI-RS resource Re1 (TCI state T1, T2), CSI-RS resource Re2 (TCI state T3, T4), CSI-RS resource Re3 (TCI state T1, T2), and CSI-RS resource Re4 (TCI state T3, T4). Of these four resources, the first CSI-RS resource Re1 is associated with the third CSI-RS resource Re3 having the same TCI state T1, T2, and the second CSI-RS resource Re2 is associated with the fourth CSI-RS resource Re4 having the same TCI state T3, T4. In this case, only CSI-RS resource Re1 in the first pair of associated CSI-RS resources and CSI-RS resource Re2 in the second pair of associated CSI-RS resources are counted in the CRI index. For example, for a first pair of associated CSI-RS resources Re1 and Re3, the CRI may be determined as CRI=0, for a second pair of associated CSI-RS resources Re2 and Re4, the CRI may be determined as CRI=1, and so on.

[0082] In some embodiments of the present application, PMI_3 / RI_3 may be calculated / determined based on CSI-RS resource Re1 corresponding to the CRI within G1, and PMI_4 / RI_4 may be calculated / determined based on CSI-RS resource Re2 corresponding to the CRI within G1.

[0083] To facilitate understanding of the present disclosure, FIG. 10 illustrates a high-level diagram of CSI reporting and CSI reporting settings according to an embodiment of the present application. As illustrated in FIG. 10, the CSI reporting settings may include configuration for at least one of CSI A, CSI B, and CSI C. For example, among the three CSIs, CSI A and / or CSI B may be used, for example, for single TRP transmission, and they may each be associated with two TRPs. Unlike CSI A / CSI B, CSI C may be used for NCJT scenarios. In some embodiments, the CSI reporting may be based on a configuration in the CSI reporting settings. For example, if the CSI reporting settings include a configuration for only one CSI with one CRI (e.g., for single TRP transmission), the terminal device may report only one of CSI A or CSI B, or the terminal device reports only CSI A. For another example, if the CSI reporting setting includes a configuration for two CSIs each having one CRI (e.g., for single TRP transmission), the terminal device may report both CSI A and CSI B. Additionally or alternatively, in some embodiments, the CSI reporting setting may include CSI C. For example, if the CSI reporting setting includes a configuration for CSI for both multi-TRP transmission and single-TRP transmission, the terminal device may report the CSI for single transmission or multi-transmission, or both. In some embodiments, CSI A and CSI C may be reported in the CSI report. In some embodiments, CSI A, CSI B, and CSI C may be reported in the CSI report. In some embodiments, CSI C may be reported in the CSI report. In some embodiments, one of CSI A and CSI C may be reported in the CSI report.

[0084] In some other embodiments of the present disclosure, or alternatively in other aspects of the present application, the CSI reporting setting may include at least one of two rank restrictions or at least two codebook subset restrictions. For example, the rank restrictions and the CBSR may relate to a single TRP transmission or a multi-TRP transmission.

[0085] 11 is a diagram illustrating an example configuration included in the CSI reporting setting according to some embodiments of the present application. As shown in FIG. 11, in some embodiments, the CBSR may include at least one of a first CBSR CBSR_1, a second CBSR CBSR_2, a third CBSR CBSR_3, a fourth CBSR CBSR_4, and a fifth CBSR CBSR_5. Additionally or alternatively, in some embodiments, the rank restriction may include at least one of a first rank indicator (RI) restriction RI-Res1, a second RI restriction RI-Res2, a third RI restriction RI-Res3, a fourth RI restriction RI-Res4, and a fifth RI restriction RI-Res5.

[0086] In some embodiments of the present disclosure, the first CBSR CBSR_1 and / or the first RI restriction RI-Res1 may be associated with a first CSI (e.g., CSI_A for single TRP transmission). In some embodiments, the first CBSR CBSR_1 and / or the first RI restriction RI-Res1 may be used for PMI calculation (or CSI measurement or RI calculation, or PMI report or RI report or CQI calculation) associated with a portion of CSI-RS resources, e.g., represented as CSI-RS resource X. CSI-RS resource X may include, e.g., at least one of the CSI-RS resources in subset A, or at least one of the CSI-RS resources having one TCI state (e.g., for single TRP transmission assumption, or associated with TRP 1). As another example, CSI-RS resource X may include at least one of the CSI-RS resources in a CSI-RS resource set, or at least one of the CSI-RS resources having one TCI state (e.g., for a single-TRP transmission hypothesis, or associated with TRP 1 or TRP 2).

[0087] Alternatively or additionally, the second CBSR CBSR_2 and / or the second RI restriction RI-Res2 are associated with a second CSI (e.g., CSI B for single TRP transmission). In some embodiments, the second CBSR CBSR_2 and / or the second RI restriction RI_res2 may be applied to a PMI calculation (or CSI measurement or RI calculation, or PMI report or RI report or CQI calculation) associated with a portion of CSI-RS resources, e.g., denoted as CSI-RS resource Y. CSI-RS resource Y may include, e.g., at least one of the CSI-RS resources in subset B or at least one of the CSI-RS resources having one TCI state (e.g., for the single TRP transmission assumption or associated with TRP 2).

[0088] In some embodiments, for the first RI restriction and / or the second RI restriction, the bit size is 8. In some embodiments, for the first RI restriction and / or the second RI restriction, the bit size is 4. For illustrative purposes only, exemplary first and second CSI-RS resource restrictions including the first and second RI restrictions and exemplary first and second CBSRs are provided below. Examples of RI Restriction ri-Restriction-1 (e.g. RI_res1) BIT STRING (SIZE (8)) ri-Restriction-2 (eg RI_res2) BIT STRING (SIZE (8)) or ri-Restriction-1 (e.g. RI_res1) BIT STRING (SIZE (4)) ri-Restriction-2 (eg RI_res2) BIT STRING (SIZE (4))

[0089] In an example RI restriction, RI_res1 may be used for CSI A and / or RI_res2 may be used for CSI B. For example, two RI restrictions are both used for single TRP transmission, and the underlined restriction may represent a first RI restriction RI_res1 for single TRP transmission reporting, e.g., associated with TRP 1, and another restriction may represent a second RI restriction RI_res2 for single TRP transmission reporting, e.g., associated with TRP 2. Exemplary CBSR Restrictions nrOfAntennaPorts CHOICE { two SEQUENCE { twoTX-CodebookSubsetRestriction-1 (e.g. CBSR_1) BIT STRING (SIZE (6)) twoTX-CodebookSubsetRestriction-2 (e.g. CBSR_2) BIT STRING (SIZE (6)) } moreThanTwo SEQUENCE n1-n2 CHOICE { two-one-TypeI-SinglePanel-Restriction-1 (e.g. CBSR_1) BIT STRING (SIZE (8)), two-two-TypeI-SinglePanel-Restriction-1 (e.g. CBSR_1) BIT STRING (SIZE (64)), four-one-TypeI-SinglePanel-Restriction-1 (e.g. CBSR_1) BIT STRING (SIZE (16)), three-two-TypeI-SinglePanel-Restriction-1 (e.g. CBSR_1) BIT STRING (SIZE (96)), six-one-TypeI-SinglePanel-Restriction-1 (e.g. CBSR_1) BIT STRING (SIZE (24)), four-two-TypeI-SinglePanel-Restriction-1 (e.g. CBSR_1) BIT STRING (SIZE (128)), eight-one-TypeI-SinglePanel-Restriction-1 (e.g. CBSR_1) BIT STRING (SIZE (32)), four-three-TypeI-SinglePanel-Restriction-1 (e.g. CBSR_1) BIT STRING (SIZE (192)), six-two-TypeI-SinglePanel-Restriction-1 (e.g. CBSR_1) BIT STRING (SIZE (192)), twelve-one-TypeI-SinglePanel-Restriction-1 (e.g. CBSR_1) BIT STRING (SIZE (48)), four-four-TypeI-SinglePanel-Restriction-1 (e.g. CBSR_1) BIT STRING (SIZE (256)), eight-two-TypeI-SinglePanel-Restriction-1 (e.g. CBSR_1) BIT STRING (SIZE (256)), sixteen-one-TypeI-SinglePanel-Restriction-1 (e.g. CBSR_1) BIT STRING (SIZE (64)) two-one-TypeI-SinglePanel-Restriction-2 (e.g. CBSR_2) BIT STRING (SIZE (8)), two-two-TypeI-SinglePanel-Restriction-2 (e.g. CBSR_2) BIT STRING (SIZE (64)), four-one-TypeI-SinglePanel-Restriction-2 (e.g. CBSR_2) BIT STRING (SIZE (16)), three-two-TypeI-SinglePanel-Restriction-2 (e.g. CBSR_2) BIT STRING (SIZE (96)), six-one-TypeI-SinglePanel-Restriction-2(e.g. CBSR_2) BIT STRING (SIZE (24)), four-two-TypeI-SinglePanel-Restriction-2 (e.g. CBSR_2) BIT STRING (SIZE (128)), eight-one-TypeI-SinglePanel-Restriction-2 (e.g. CBSR_2) BIT STRING (SIZE (32)), four-three-TypeI-SinglePanel-Restriction-2 (e.g. CBSR_2) BIT STRING (SIZE (192)), six-two-TypeI-SinglePanel-Restriction-2 (e.g. CBSR_2) BIT STRING (SIZE (192)), twelve-one-TypeI-SinglePanel-Restriction-2 (e.g. CBSR_2) BIT STRING (SIZE (48)), four-four-TypeI-SinglePanel-Restriction-2 (e.g. CBSR_2) BIT STRING (SIZE (256)), eight-two-TypeI-SinglePanel-Restriction-2 (e.g. CBSR_2) BIT STRING (SIZE (256)), sixteen-one-TypeI-SinglePanel-Restriction-2 (e.g. CBSR_2) BIT STRING (SIZE (64)) }, typeI-SinglePanel-codebookSubsetRestriction-i2-1 (e.g. CBSR-i2_1) BIT STRING (SIZE (16)) typeI-SinglePanel-codebookSubsetRestriction-i2-2 (e.g. CBSR-i2_2) BIT STRING (SIZE (16)) OPTIONAL -- Need R } },

[0090] In the above example CBSR restrictions, the underlined CBSR restrictions (e.g., CBSR_1 and / or CBSR-i2_1) may represent a first CBSR CBSR_1 for CSI A (e.g., for a single TRP, e.g., associated with TRP 1), and the other CBSR restrictions (e.g., CBSR_2 and / or CBSR-i2_2) may represent a second CBSR CBSR_2 for CSI B (e.g., for a single TRP, e.g., associated with TRP 2).

[0091] In some embodiments, the first CBSR (e.g., CBSR_1) may correspond to a precoder that is not permitted for reporting of the first PMI in CSI A. In some embodiments, the first CBSR (e.g., CBSR-i2_1) may correspond to a precoder that is not permitted to be selected for computation of a CQI in CSI A. In some embodiments, the first RI restriction (e.g., RI_res1) may define a first number of layers, where precoders associated with the first number of layers are not permitted for reporting of the first PMI and / or the first RI in CSI A. In some embodiments, the first RI restriction (e.g., RI_res1) may define a first number of layers that are not permitted for use in reporting of the first RI in CSI A. In some embodiments, the second CBSR (e.g., CBSR_2) may correspond to a precoder that is not permitted for use in reporting of the second PMI in CSI B. In some embodiments, the second CBSR (e.g., CBSR-i2_2) may correspond to a precoder that is not permitted to be selected for computation of a CQI in CSI B. In some embodiments, the second RI restriction (e.g., RI_res2) may define a second number of tiers whose associated precoders are not permitted to be used for reporting a second PMI and / or a second RI in CSI B. In some embodiments, the second RI restriction (e.g., RI_res2) may define a second number of tiers that are not permitted to be used for reporting a second RI in CSI B.

[0092] The restriction CBSR_1 may define a precoder associated with PMI_1 that is not allowed to be used for CQI calculation, and the restriction RI_res1 may define an RI that is not allowed to be used for PMI_1 and / or RI_1 reporting. This allows for restricting reporting of at least one of the first PMI and the first RI based on RI_res1 and CBSR_1. Alternatively or additionally, the restriction CBSR_2 may define a precoder associated with PMI_2 that is not allowed to be used for CQI calculation, and the restriction RI_res2 may define an RI that is not allowed to be used for PMI_2 and / or RI_2 reporting. This allows for restricting reporting of at least one of the second PMI and the second RI based on RI_res1 and CBSR_1. This allows for further reduction in computational complexity and overhead.

[0093] Alternatively or additionally, a third CBSR CBSR_3 and / or a third RI restriction RI-Res3 is associated with CSI C (e.g., for multi-TRP transmission). In some embodiments, the third CBSR CBSR_3 and / or the third RI restriction RI_res3 may be applied to two PMI (PMI_3 and PMI_4) calculations / reports and / or two RI (RI_3 and RI_4) calculations / reports (or CSI measurements / reports) and / or CQI calculations in CSI C associated with some CSI-RS resources, e.g., denoted as CSI-RS resources Z. CSI-RS resources Z may include CSI-RS resources (e.g., due to NCJT assumptions). For example, CSI-RS resource Z may include at least one of a CSI-RS resource in subset A, a CSI-RS resource in subset B associated with a CSI-RS resource in subset A (e.g., for an NCJT hypothesis), or a CSI-RS resource having two TCI states (e.g., for an NCJT hypothesis), etc.

[0094] In some embodiments, the third CBSR CBSR_3 may correspond to a precoder (e.g., a precoder pair (e.g., P1 and P2)) that is not permitted to be used for reporting the third PMI and the fourth PMI in CSI C. For example, P1 corresponds to a precoder that is not permitted to be used for reporting the third PMI. For another example, P2 corresponds to a precoder that is not permitted to be used for reporting the fourth PMI. In some embodiments, the third CBSR CBSR_3 may correspond to a precoder (e.g., a precoder pair (e.g., P1 and P2)) that is not permitted to be selected for calculation of a CQI in CSI. In some embodiments, the third RI restriction RI_res3 may define a third number of layers and a fourth number of layers, where a precoder associated with the third number of layers is not permitted to be used for reporting a third PMI and / or a third RI in CSI C, and a precoder associated with the fourth number of layers is not permitted to be used for reporting a fourth PMI and / or a fourth RI in CSI C. In some embodiments, the third RI restriction RI_res3 may define a third number of layers and a fourth number of layers, where the third number of layers is not permitted to be used for reporting a third RI in CSI C, and the fourth number of layers is not permitted to be used for reporting a fourth RI in CSI C.

[0095] CBSR_3 may define a precoder pair (e.g., P1 and P2) that is not allowed to be used for CQI calculation, where P1 is associated with PMI_1 and P2 is associated with PMI_2. Restriction RI_res3 defines a RI pair (R1 and R2) that is not allowed to be used for PMI and / or RI reporting, where R1 is associated with the first RI report RI_3 and R2 is associated with the second RI report RI_4. Thus, reporting of the third and fourth PMI may be restricted based on at least one of the third CBSR and the third RI restriction, and reporting of the third and fourth RI may be restricted based on at least one of the third CBSR and the third RI restriction.

[0096] For illustrative purposes only, an exemplary third CRI-RS resource restriction including exemplary RI and CBRS restrictions is provided below. Example RI Limits ri-Restriction-3 (eg RI_res3) BIT STRING (SIZE (8)) Example RI Limits ri-Restriction-3 (e.g. RI_res3) R1 BIT STRING (SIZE (4) R2 BIT STRING (SIZE (4)

[0097] In a first exemplary RI restriction, the first four bits in RI_res3 may apply to rank restriction R1 associated with reporting of a third RI in a CSI and / or a third PMI, and the remaining four bits in RI_res3 may apply to rank restriction R2 associated with reporting of a fourth RI in a CSI and / or a fourth PMI. In a second exemplary RI restriction, it may include two separate parts for R1 and R2, respectively, each part having a bit size of 4. Example CBSR Restrictions nrOfAntennaPorts CHOICE { two SEQUENCE { twoTX-CodebookSubsetRestriction-3 (eg CBSR_3_1) BIT STRING (SIZE (6)) twoTX-CodebookSubsetRestriction-3 (eg CBSR_3_2) BIT STRING (SIZE (6)) } moreThanTwo SEQUENCE n1-n2 CHOICE { two-one-TypeI-SinglePanel-Restriction-3 (eg CBSR_3_1) BIT STRING (SIZE (8)), two-two-TypeI-SinglePanel-Restriction-3 (eg CBSR_3_1) BIT STRING (SIZE (64)), four-one-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3_1) BIT STRING (SIZE (16)), three-two-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3_1) BIT STRING (SIZE (96)), six-one-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3_1) BIT STRING (SIZE (24)), four-two-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3_1) BIT STRING (SIZE (128)), eight-one-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3_1) BIT STRING (SIZE (32)), four-three-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3_1) BIT STRING (SIZE (192)), six-two-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3_1) BIT STRING (SIZE (192)), twelve-one-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3_1) BIT STRING (SIZE (48)), four-four-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3_1) BIT STRING (SIZE (256)), eight-two-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3_1) BIT STRING (SIZE (256)), sixteen-one-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3_1) BIT STRING (SIZE (64)) two-one-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3_2) BIT STRING (SIZE (8)), two-two-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3_2) BIT STRING (SIZE (64)), four-one-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3_2) BIT STRING (SIZE (16)), three-two-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3_2) BIT STRING (SIZE (96)), six-one-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3_2) BIT STRING (SIZE (24)), four-two-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3_2) BIT STRING (SIZE (128)), eight-one-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3_2) BIT STRING (SIZE (32)), four-three-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3_2) BIT STRING (SIZE (192)), six-two-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3_2) BIT STRING (SIZE (192)), twelve-one-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3_2) BIT STRING (SIZE (48)), four-four-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3_2) BIT STRING (SIZE (256)), eight-two-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3_2) BIT STRING (SIZE (256)), sixteen-one-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3_2) BIT STRING (SIZE (64)) }, typeI-SinglePanel-codebookSubsetRestriction-i2-3 (e.g. CBSR-i2_3_1) BIT STRING (SIZE (16)) typeI-SinglePanel-codebookSubsetRestriction-i2-3 (e.g. CBSR-i2_3_2) BIT STRING (SIZE (16)) OPTIONAL -- Need R } },

[0098] In the above example CBSR restrictions, the CBSR restrictions (e.g., CBSR_3_1 and CBSR_3_2) and / or the CBSR restrictions (e.g., CBSR-i2_3_1 and CBSR-i2_3_2) may represent a third CBSR (e.g., CBSR_3) for CSI C (e.g., for the NCJT hypothesis). For example, the CBSR restriction (e.g., CBSR_3_1) may correspond to a precoder restricted for a third PMI report and / or a third RI report. For another example, the CBSR restriction (e.g., CBSR_3_2) may correspond to a precoder restricted for a fourth PMI report and / or a fourth RI report. For example, the CBSR restriction (e.g., CBSR-i2_3_1) may correspond to a precoder restricted for a CQI calculation in CSI C. For another example, a CBSR restriction (e.g., CBSR-i2_3_2) may correspond to a precoder restricted for computation of CQI in CSI C. For example, a CBSR restriction (e.g., CBSR_3_1 and / or CBSR-i2_3_1) defines P1, and a CBSR restriction (e.g., CBSR_3_2 and / or CBSR-i2_3_2) defines P2.

[0099] For illustrative purposes, another example of a CBSR restriction is given below. Example CBSR Restrictions nrOfAntennaPorts CHOICE { two SEQUENCE { twoTX-CodebookSubsetRestriction-3 (eg CBSR_3) BIT STRING (SIZE (12)) } moreThanTwo SEQUENCE n1-n2 CHOICE { two-one-TypeI-SinglePanel-Restriction-3 (eg CBSR_3) BIT STRING (SIZE (16)), two-two-TypeI-SinglePanel-Restriction-3 (eg CBSR_3) BIT STRING (SIZE (128)), four-one-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3) BIT STRING (SIZE (32)), three-two-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3) BIT STRING (SIZE (192)), six-one-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3) BIT STRING (SIZE (48)), four-two-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3) BIT STRING (SIZE (256)), eight-one-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3) BIT STRING (SIZE (64)), four-three-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3) BIT STRING (SIZE (384)), six-two-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3) BIT STRING (SIZE (384)), twelve-one-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3) BIT STRING (SIZE (96)), four-four-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3) BIT STRING (SIZE (512)), eight-two-TypeI-SinglePanel-Restriction-3 (e.g. CBSR_3) BIT STRING (SIZE (512)), sixteen-one-TypeI-SinglePanel-Restriction-3 (eg CBSR_3) BIT STRING (SIZE (128)) }, typeI-SinglePanel-codebookSubsetRestriction-i2-3 (eg CBSR-i2_3) BIT STRING (SIZE (32)) OPTIONAL -- Need R }

[0100] In the above example CBSR restrictions, a CBSR restriction (e.g., CBSR_3 and / or CBSR-i2_3) may represent a third CBSR for CSI C (e.g., for the NCJT hypothesis). For example, the first half bits in CBSR_3 may be applied to P1 associated with a precoder restriction for a third PMI report and / or a third RI report and / or a CQI calculation in CSI C, and the remaining half bits in CBSR_3 may be applied to P2 associated with a precoder restriction for a fourth PMI report and / or a fourth RI report and / or a CQI calculation in CSI C. For example, the first half bits (e.g., first 16 bits) of CBSR-i2_3 may be applied to P1 associated with a precoder restriction for a CQI calculation in CSI C, and the remaining half bits (e.g., remaining 16 bits) of CBSR-i2_3 may be applied to P2 associated with a precoder restriction for a CQI calculation in CSI C.

[0101] Alternatively or additionally, as shown in FIG. 11 , the CSI reporting settings may include a fourth CBSR and a fifth CBSR, and / or a fourth RI restriction and a fifth RI restriction (e.g., (CBSR_4, CBSR_5) and / or (RI_res4, RI_res5)). In particular, the CSI reporting settings may include fourth and fifth RI restrictions RI-Res4, RI-Res5, and fourth and fifth CBSRs CBSR_4, CBSR_5. For example, these are all related to CSI C for multi-TRP transmission.

[0102] In some embodiments, the two CBSRs CBSR_4, CBSR_5 and / or the two RI limitations RI_res4, RI_res5 may be used for a third and fourth PMI (PMI_3 and PMI_4) calculation / report and / or a third and fourth RI RI_3, RI_4 calculation / report (or CSI measurement / report) and / or a CQI calculation in CSI C, e.g., associated with some CSI-RS resources represented as CSI-RS resource W and CSI-RS resource V. For example, CRI-RS resource W may include at least one of the CSI-RS resources in subset A. For another example, CRI-RS resource V may include at least one of the CSI-RS resources associated with CSI-RS resource W in subset B. Or, alternatively, CRI-RS resources W and V may include two CSI-RS resources having the same two TCI states (e.g., due to NCJT assumptions).

[0103] In some embodiments, the fourth CBSR CBSR_4 may correspond to a precoder that is not permitted to be used for reporting the third PMI in CSI C. In some embodiments, the fifth CBSR CBSR_5 may correspond to a precoder that is not permitted to be used for reporting the fourth PMI in CSI C. In some embodiments, the fourth CBSR CBSR_4 and / or the fifth CBSR CBSR_5 may correspond to a precoder that is not permitted to be selected for computation of a CQI in the CSI. In some embodiments, the fourth RI restriction (e.g., RI_res4) may define a fifth number of layers, where precoders associated with the fifth number of layers are not permitted to be used for reporting the third PMI in CSI C and / or the third RI. In some embodiments, a fifth RI restriction (e.g., RI_res5) may define a sixth number layer, where a precoder associated with the sixth number layer is not permitted to be used for reporting a fourth PMI and / or a fourth RI in CSI C. In some embodiments, a fourth RI restriction (e.g., RI_res4) may define a fifth number layer, where the fifth number layer is not permitted to be used for reporting a third RI in CSI C. In some embodiments, a fifth RI restriction (e.g., RI_res5) may define a sixth number layer, where the sixth number layer is not permitted to be used for reporting a fourth RI in CSI C.

[0104] In some embodiments of the present disclosure, restriction CBSR_4 may define precoders associated with PMI_3 that are not permitted to be used for CQI calculations, and restriction CBSR_5 may define precoders associated with PMI_4 that are not permitted to be used for CQI calculations.

[0105] In some embodiments of the present disclosure, restriction RI_res4 may define an RI that is not permitted to be used for PMI_3 and / or RI_3 reporting, and restriction RI_res5 may define an RI that is not permitted to be used for PMI_4 and / or RI_4 reporting. Thus, reporting of the third PMI may be restricted based on at least one of the fourth CBSR and the fourth RI restriction, and reporting of the fourth PMI may be restricted based on at least one of the fifth CBSR and the fifth RI restriction. Additionally or alternatively, reporting of the third RI may be restricted based on at least one of the fourth CBSR and the fourth RI restriction, and reporting of the fourth RI may be restricted based on at least one of the fifth CBSR and the fifth RI restriction.

[0106] For illustrative purposes only, exemplary limits are given below. Example RI Limits Example RI restrictions ri-Restriction-4 (eg RI_res4) BIT STRING (SIZE (4)) ri-Restriction-5 (eg RI_res5) BIT STRING (SIZE (4)) Example RI Limits nrOfAntennaPorts CHOICE { two SEQUENCE { twoTX-CodebookSubsetRestriction-4 (eg CBSR_4) BIT STRING (SIZE (6)) twoTX-CodebookSubsetRestriction-5 (eg CBSR_5) BIT STRING (SIZE (6)) }, moreThanTwo SEQUENCE { n1-n2 CHOICE { two-one-TypeI-SinglePanel-Restriction-4 (e.g. CBSR_4) BIT STRING (SIZE (8)), two-two-TypeI-SinglePanel-Restriction-4 (e.g. CBSR_4) BIT STRING (SIZE (64)), four-one-TypeI-SinglePanel-Restriction-4 (e.g. CBSR_4) BIT STRING (SIZE (16)), three-two-TypeI-SinglePanel-Restriction-4 (e.g. CBSR_4) BIT STRING (SIZE (96)), six-one-TypeI-SinglePanel-Restriction-4 (e.g. CBSR_4) BIT STRING (SIZE (24)), four-two-TypeI-SinglePanel-Restriction-4 (e.g. CBSR_4) BIT STRING (SIZE (128)), eight-one-TypeI-SinglePanel-Restriction-4 (e.g. CBSR_4) BIT STRING (SIZE (32)), four-three-TypeI-SinglePanel-Restriction-4 (e.g. CBSR_4) BIT STRING (SIZE (192)), six-two-TypeI-SinglePanel-Restriction-4 (e.g. CBSR_4) BIT STRING (SIZE (192)), twelve-one-TypeI-SinglePanel-Restriction-4 (e.g. CBSR_4) BIT STRING (SIZE (48)), four-four-TypeI-SinglePanel-Restriction-4 (e.g. CBSR_4) BIT STRING (SIZE (256)), eight-two-TypeI-SinglePanel-Restriction-4 (e.g. CBSR_4) BIT STRING (SIZE (256)), sixteen-one-TypeI-SinglePanel-Restriction-4 (e.g. CBSR_4) BIT STRING (SIZE (64)) two-one-TypeI-SinglePanel-Restriction-5 (e.g. CBSR_5) BIT STRING (SIZE (8)), two-two-TypeI-SinglePanel-Restriction-5 (e.g. CBSR_5) BIT STRING (SIZE (64)), four-one-TypeI-SinglePanel-Restriction-5 (e.g. CBSR_5) BIT STRING (SIZE (16)), three-two-TypeI-SinglePanel-Restriction-5 (e.g. CBSR_5) BIT STRING (SIZE (96)), six-one-TypeI-SinglePanel-Restriction-5 (e.g. CBSR_5) BIT STRING (SIZE (24)), four-two-TypeI-SinglePanel-Restriction-5 (e.g. CBSR_5) BIT STRING (SIZE (128)), eight-one-TypeI-SinglePanel-Restriction-5 (e.g. CBSR_5) BIT STRING (SIZE (32)), four-three-TypeI-SinglePanel-Restriction-5 (e.g. CBSR_5) BIT STRING (SIZE (192)), six-two-TypeI-SinglePanel-Restriction-5 (e.g. CBSR_5) BIT STRING (SIZE (192)), twelve-one-TypeI-SinglePanel-Restriction-5 (e.g. CBSR_5) BIT STRING (SIZE (48)), four-four-TypeI-SinglePanel-Restriction-5 (e.g. CBSR_5) BIT STRING (SIZE (256)), eight-two-TypeI-SinglePanel-Restriction-5 (e.g. CBSR_5) BIT STRING (SIZE (256)), sixteen-one-TypeI-SinglePanel-Restriction-5 (e.g. CBSR_5) BIT STRING (SIZE (64)) }, typeI-SinglePanel-codebookSubsetRestriction-i2-4 (e.g. CBSR-i2_4) BIT STRING (SIZE (16)) typeI-SinglePanel-codebookSubsetRestriction-i2-5 (e.g. CBSR-i2_5) BIT STRING (SIZE (16)) OPTIONAL -- Need R

[0107] In the example restrictions, RI_res4 and RI_res5 are two separate restrictions, CBSR_4 and CBSR_5 are two separate restrictions, and CBSR-i2_4 and CBSR-i2_5 are two separate restrictions. Thus, each of these restrictions may be used to restrict a CSI resource individually. For example, RI_res4 may be used to define an RI that is not allowed to be used for CSI reporting for CSI A (e.g., for TRP 1), and RI_res5 may be used to define an RI that is not allowed to be used for CSI reporting for CSI B (e.g., for TRP 2).

[0108] Alternatively, in the exemplary third CBSR restriction, one restriction is used to define one pair of CSI resources, so that it is possible to restrict a specific pair of CSI resources among all possible resource combinations. For example, an RI pair (R1, R2) may be defined to be excluded from resources for CSI reporting, and other resource pairs including R1 or R2 may still be applied.

[0109] In some embodiments of the present disclosure, the first CSI may include a first CQI, and a precoder selected randomly for computation of a first channel quality indicator (CQI) in the first CSI may be restricted based on a first CBSR (e.g., CBSR-i2_1). Additionally or alternatively, the second CSI may include a second CQI, and a precoder selected randomly for computation of the second CQI in the second CSI may be restricted based on a second CBSR (e.g., CBSR-i2_2). Additionally or alternatively, the third CSI may include a third CQI, and a precoder selected randomly for computation of the third CQI in the third CSI may be restricted based on a third CBSR (e.g., CBSR-i2_3 or CBSR-i2_3_1 and CBSR-i2_3_2). Additionally or alternatively, the third CSI may include a third CQI, and a precoder randomly selected for calculation of the third CQI in the third CSI may be restricted based on a fourth CBSR (e.g., CBSR-i2_4) and a fifth CBSR (e.g., CBSR-i2_5).

[0110] In the above exemplary embodiment, the CSI reporting setting includes at least two RI restrictions and / or at least two CBSR restrictions, but it should be noted that the present disclosure is not limited thereto. For example, in the case of multi-TRP transmission, it may include only the third CSI resource restriction (CBSR_3, RI_Res3) or the fourth and fifth resource restrictions ((CBSR)).

[0111] It should be noted that the CSI reporting setting solution described above with reference to FIG. 11 may be applied in combination with the CSR reporting solutions described with reference to FIGS. 1 to 10, or alternatively, they may be applied separately as separate aspects of the present disclosure.

[0112] 12 is a flow chart of an example method 1200 for communication according to an embodiment of the present disclosure. The communication method 1200 may be performed in a network device including, for example, the TRP 110 or 120 as shown in FIG.

[0113] 12, in block 1210, a network device receives one or more settings for at least one of a first channel state information (CSI), a second CSI, or a third CSI in a CSI reporting setting at the network device. The one or more settings in the CSI reporting setting include at least one of at least two rank restrictions or at least two codebook subset restrictions (CBSRs). In block 1210, a network device receives at least one of the first CSI, the second CSI, or the third CSI based on the one or more settings at the network device.

[0114] In some embodiments of the present application, the at least two rank restrictions include at least two of a first rank indicator (RI) restriction, a second RI restriction, a third RI restriction, a fourth RI restriction, or a fifth RI restriction, and / or the at least two CBSRs include at least two of a first CBSR, a second CBSR, a third CBSR, a fourth CBSR, or a fifth CBSR. For example, the first RI restriction and / or the first CBSR is associated with a first CSI. Additionally or alternatively, the second RI restriction and / or the second CBSR is associated with a second CSI, and / or the third RI restriction and / or the third CBSR is associated with a third CSI. Additionally or alternatively, the fourth and fifth RI restrictions and / or the fourth and fifth CBSRs are associated with a third CSI.

[0115] In some embodiments of the present application, the first CSI includes at least one of the first CRI, the first PMI, and the first RI. Additionally or alternatively, the second CSI includes at least one of the second CRI, the second PMI, and the second RI. Additionally or alternatively, the third CSI includes at least one of the third CRI and fourth CRI, one or both of the third PMI and fourth PMI, and one or both of the third RI and fourth RI.

[0116] In some embodiments of the present application, the first CSI is associated with a single transmission / reception point (TRP) transmission. Additionally or alternatively, the second CSI is associated with a single TRP transmission. Additionally or alternatively, the third CSI is associated with a multi-TRP transmission.

[0117] In some embodiments of the present disclosure, reporting of at least one of the first PMI and the first RI is restricted based on at least one of the first CBSR and the first RI restriction. Additionally or alternatively, reporting of at least one of the second PMI and the second RI is restricted based on at least one of the second CBSR and the second RI restriction. Additionally or alternatively, reporting of the third and fourth PMI is restricted based on at least one of the third CBSR and the third RI restriction, and reporting of the third and fourth RI is restricted based on at least one of the third CBSR and the third RI restriction. Additionally or alternatively, reporting of the third PMI is restricted based on at least one of the fourth CBSR and the fourth RI restriction, and reporting of the fourth PMI is restricted based on at least one of the fifth CBSR and the fifth RI restriction. Additionally or alternatively, reporting of the third RI is restricted based on at least one of a fourth CBSR and a fourth RI restriction, and reporting of the fourth RI is restricted based on at least one of a fifth CBSR and a fifth RI restriction. Additionally or alternatively, a precoder randomly selected for calculation of a first channel quality indicator (CQI) in a first CSI is restricted based on a first CBSR. Additionally or alternatively, a precoder randomly selected for calculation of a second CQI in a second CSI is restricted based on a second CBSR. Additionally or alternatively, a precoder randomly selected for calculation of a third CQI in a third CSI is restricted based on a third CBSR. Additionally or alternatively, a precoder randomly selected for calculation of a third CQI in a third CSI is restricted based on a fourth CBSR and a fifth CBSR.

[0118] In some embodiments of the present application, the method further includes transmitting, in the network device, a Channel State Information Reference Signal (CSI-RS) resource set for channel measurement, the CSI-RS resource set including at least two CSI-RS resources.

[0119] In some embodiments of the present application, the CSI-RS resource set includes a first subset and a second subset.

[0120] In some embodiments of the present application, each CSI-RS resource in a CSI-RS resource set is associated with one transmission configuration indication (TCI) state.

[0121] In some embodiments of the present application, the first subset includes at least one CSI-RS resource that is respectively associated with a CSI-RS resource in the second subset.

[0122] In some embodiments of the present application, the at least one CSI-RS resource in the first subset and the associated CSI-RS resource in the second subset are used for multi-TRP transmission.

[0123] In some embodiments of the present application, each of the CSI-RS resources in the first subset is associated with two TCI states and each of the CSI-RS resources in the second subset is associated with one TCI state.

[0124] In some embodiments of the present application, the first subset includes at least one pair of CSI-RS resources that are associated with the same two TCI states.

[0125] In some embodiments of the present application, at least one pair of CSI-RS resources associated with the same two TCI states is used for multi-TRP transmission.

[0126] According to an embodiment of the present disclosure, a terminal device includes a circuit configured to receive, in the terminal device, one or more settings for at least one of a first channel state information (CSI), a second CSI, or a third CSI in a CSI reporting setting, the one or more settings including at least one of at least two rank restrictions or at least two codebook subset restrictions (CBSRs), and to transmit at least one of the first CSI, the second CSI, or the third CSI to a network device based on the one or more settings.

[0127] In some embodiments of the present disclosure, the at least two rank restrictions may include at least two of a first rank indicator (RI) restriction, a second RI restriction, a third RI restriction, a fourth RI restriction, or a fifth RI restriction, and / or the at least two CBSRs may include at least two of a first CBSR, a second CBSR, a third CBSR, a fourth CBSR, or a fifth CBSR. Additionally or alternatively, the first RI restriction and / or the first CBSR are associated with a first CSI. Additionally or alternatively, the second RI restriction and / or the second CBSR are associated with a second CSI, and / or the third RI restriction and / or the third CBSR are associated with a third CSI. Additionally or alternatively, the fourth and fifth RI restrictions and / or the fourth and fifth CBSRs are associated with a third CSI.

[0128] In some embodiments of the present disclosure, the first CSI includes at least one of the first CRI, the first PMI, and the first RI. Additionally or alternatively, the second CSI includes at least one of the second CRI, the second PMI, and the second RI. Additionally or alternatively, the third CSI includes at least one of the third CRI and fourth CRI, one or both of the third PMI and fourth PMI, and one or both of the third RI and fourth RI.

[0129] In some embodiments of the present disclosure, the first CSI is associated with a single transmission / reception point (TRP) transmission. Additionally or alternatively, the second CSI is associated with a single-TRP transmission. Additionally or alternatively, the third CSI is associated with a multi-TRP transmission.

[0130] In some embodiments of the present disclosure, reporting of at least one of the first PMI and the first RI is restricted based on at least one of the first CBSR and the first RI restriction. Additionally or alternatively, reporting of at least one of the second PMI and the second RI is restricted based on at least one of the second CBSR and the second RI restriction. Additionally or alternatively, reporting of the third and fourth PMI is restricted based on at least one of the third CBSR and the third RI restriction, and reporting of the third and fourth RI is restricted based on at least one of the third CBSR and the third RI restriction. Additionally or alternatively, reporting of the third PMI is restricted based on at least one of the fourth CBSR and the fourth RI restriction, and reporting of the fourth PMI is restricted based on at least one of the fifth CBSR and the fifth RI restriction. Additionally or alternatively, reporting of the third RI is restricted based on at least one of a fourth CBSR and a fourth RI restriction, and reporting of the fourth RI is restricted based on at least one of a fifth CBSR and a fifth RI restriction. Additionally or alternatively, a precoder randomly selected for calculation of a first channel quality indicator (CQI) in a first CSI is restricted based on a first CBSR. Additionally or alternatively, a precoder randomly selected for calculation of a second CQI in a second CSI is restricted based on a second CBSR. Additionally or alternatively, a precoder randomly selected for calculation of a third CQI in a third CSI is restricted based on a third CBSR. Additionally or alternatively, a precoder randomly selected for calculation of a third CQI in a third CSI is restricted based on a fourth CBSR and a fifth CBSR.

[0131] In some embodiments of the present disclosure, the circuitry may be further configured to receive, at the terminal device, a channel state information reference signal (CSI-RS) resource set including at least two CSI-RS resources for CSI reporting for channel measurement.

[0132] In some embodiments of the present disclosure, the CSI-RS resource set includes a first subset and a second subset.

[0133] In some embodiments of the present disclosure, each of the CSI-RS resources in a CSI-RS resource set is associated with one transmission configuration indication (TCI) state.

[0134] In some embodiments of the present disclosure, the first subset includes at least one CSI-RS resource that is respectively associated with a CSI-RS resource in the second subset.

[0135] In some embodiments of the present disclosure, the at least one CSI-RS resource in the first subset and the associated CSI-RS resource in the second subset are used for a multi-TRP transmission.

[0136] In some embodiments of the present disclosure, each of the CSI-RS resources in the first subset is associated with two TCI states and each of the CSI-RS resources in the second subset is associated with one TCI state.

[0137] In some embodiments of the present disclosure, the first subset includes at least one pair of CSI-RS resources that are associated with the same two TCI states.

[0138] In some embodiments of the present disclosure, at least one pair of CSI-RS resources associated with the same two TCI states is used for multi-TRP transmission.

[0139] According to an embodiment of the present disclosure, a network device includes a circuit configured to transmit, in a network, one or more settings for at least one of a first channel state information (CSI), a second CSI, or a third CSI in a CSI reporting setting, the one or more settings including at least one of at least two rank restrictions or at least two codebook subset restrictions (CBSRs), and receive, in the network device, at least one of the first CSI, the second CSI, or the third CSI based on the one or more settings.

[0140] In some embodiments of the present disclosure, the at least two rank restrictions include at least two of a first rank indicator (RI) restriction, a second RI restriction, a third RI restriction, a fourth RI restriction, or a fifth RI restriction. Additionally or alternatively, the at least two CBSRs include at least two of a first CBSR, a second CBSR, a third CBSR, a fourth CBSR, or a fifth CBSR. Additionally or alternatively, the first RI restriction and / or the first CBSR is associated with a first CSI. Additionally or alternatively, the second RI restriction and / or the second CBSR is associated with a second CSI. Additionally or alternatively, the third RI restriction and / or the third CBSR is associated with a third CSI. Additionally or alternatively, the fourth and fifth RI restrictions and / or the fourth and fifth CBSRs are associated with a third CSI.

[0141] In some embodiments of the present disclosure, the first CSI includes at least one of the first CRI, the first PMI, and the first RI. Additionally or alternatively, the second CSI includes at least one of the second CRI, the second PMI, and the second RI. Additionally or alternatively, the third CSI includes at least one of the third CRI and fourth CRI, one or both of the third PMI and fourth PMI, and one or both of the third RI and fourth RI.

[0142] In some embodiments of the present disclosure, the first CSI is associated with a single transmission / reception point (TRP) transmission. Additionally or alternatively, the second CSI is associated with a single-TRP transmission. Additionally or alternatively, the third CSI is associated with a multi-TRP transmission.

[0143] In some embodiments of the present disclosure, reporting of at least one of the first PMI and the first RI is restricted based on at least one of the first CBSR and the first RI restriction. Additionally or alternatively, reporting of at least one of the second PMI and the second RI is restricted based on at least one of the second CBSR and the second RI restriction. Additionally or alternatively, reporting of the third and fourth PMI is restricted based on at least one of the third CBSR and the third RI restriction, and reporting of the third and fourth RI is restricted based on at least one of the third CBSR and the third RI restriction. Additionally or alternatively, reporting of the third PMI is restricted based on at least one of the fourth CBSR and the fourth RI restriction, and reporting of the fourth PMI is restricted based on at least one of the fifth CBSR and the fifth RI restriction. Additionally or alternatively, reporting of the third RI is restricted based on at least one of a fourth CBSR and a fourth RI restriction, and reporting of the fourth RI is restricted based on at least one of a fifth CBSR and a fifth RI restriction. Additionally or alternatively, a precoder randomly selected for calculation of a first channel quality indicator (CQI) in a first CSI is restricted based on a first CBSR. Additionally or alternatively, a precoder randomly selected for calculation of a second CQI in a second CSI is restricted based on a second CBSR. Additionally or alternatively, a precoder randomly selected for calculation of a third CQI in a third CSI is restricted based on a third CBSR. Additionally or alternatively, a precoder randomly selected for calculation of a third CQI in a third CSI is restricted based on a fourth CBSR and a fifth CBSR.

[0144] In some embodiments of the present disclosure, the circuitry may be further configured to transmit, at the network device, a channel state information reference signal (CSI-RS) resource set including at least two CSI-RS resources for CSI reporting for channel measurement.

[0145] In some embodiments of the present disclosure, the CSI-RS resource set includes a first subset and a second subset.

[0146] In some embodiments of the present disclosure, each of the CSI-RS resources in a CSI-RS resource set is associated with one transmission configuration indication (TCI) state.

[0147] In some embodiments of the present disclosure, the first subset includes at least one CSI-RS resource that is respectively associated with a CSI-RS resource in the second subset.

[0148] In some embodiments of the present disclosure, the at least one CSI-RS resource in the first subset and the associated CSI-RS resource in the second subset are used for a multi-TRP transmission.

[0149] In some embodiments of the present disclosure, each of the CSI-RS resources in the first subset is associated with two TCI states and each of the CSI-RS resources in the second subset is associated with one TCI state.

[0150] In some embodiments of the present disclosure, the first subset includes at least one pair of CSI-RS resources that are associated with the same two TCI states.

[0151] In some embodiments of the present disclosure, at least one pair of CSI-RS resources associated with the same two TCI states is used for multi-TRP transmission.

[0152] 13 is a schematic block diagram of an apparatus 1300 suitable for implementing some embodiments of the present disclosure. The apparatus 1300 may be considered as another embodiment of the network apparatus including the TRPs 110, 120 or the terminal apparatus 130 shown in FIG. 1. Thus, the apparatus 2200 may be implemented in or as at least a part of the network apparatus including the TRPs 110, 120 or the terminal apparatus 130.

[0153] As shown, the apparatus 1300 comprises a processor 1310, a memory 1320 coupled to the processor 1310, a suitable transmitter (TX) and receiver (RX) 1340 coupled to the processor 1310, and a communication interface coupled to the TX / RX 1340. The memory 1320 stores at least a portion of a program 1330. The TX / RX 1340 is used for bidirectional communication. The TX / RX 1340 has at least one antenna to facilitate communication, although the access nodes referred to herein may actually have multiple antennas. The communication interface may represent any interface required for communication with other network elements, such as an X2 or Xn interface for bidirectional communication between gNBs or eNBs, an S1 interface for communication between a mobility management entity (MME) / serving gateway (S-GW) and an eNB, an Un interface for communication between a gNB or eNB and a relay node (RN), or an Uu interface for communication between a gNB or eNB and a terminal device.

[0154] It is assumed that the program 1330 includes program instructions that, when executed by an associated processor 1310, enable the device 1300 to operate according to embodiments of the present disclosure, as described herein with reference to any of Figures 1 to 12. The embodiments herein may be realized by computer software executable by the processor 1310 of the device 1300, or by hardware, or by a combination of software and hardware. The processor 1310 may be configured to implement various embodiments of the present disclosure. Furthermore, the combination of the processor 1310 and the memory 1320 may form a processing means 1350 suitable for implementing various embodiments of the present disclosure.

[0155] The memory 1320 may be of any type suitable for a local technology network and may be implemented using any suitable data storage technology, such as, by way of non-limiting example, non-transitory computer-readable storage media, semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory. Although only one memory 1320 is shown in the device 1300, there may be several physically different memory modules in the device 1300. The processor 1310 may be of any type suitable for a local technology network and may include, by way of non-limiting example, one or more of a general purpose computer, a special purpose computer, a microprocessor, a digital signal processor (DSP), and a processor based on a multi-core processor architecture. The device 1300 may have multiple processors, for example application specific integrated circuit chips time-slaved to a clock that synchronizes the main processor.

[0156] The components included in the device and / or apparatus of the present disclosure can be realized in various ways, including software, hardware, firmware, or any combination thereof. In some embodiments, one or more units can be realized using software and / or firmware, such as machine-executable instructions stored on a storage medium. In addition to or in lieu of machine-executable instructions, some or all of the units in the device and / or apparatus can be implemented, at least in part, by one or more hardware logic components. By way of example and not limitation, exemplary types of hardware logic components that can be used include field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific general purpose products (ASSPs), systems on chips (SOCs), complex programmable logic devices (CPLDs), and the like.

[0157] Overall, various embodiments of the present disclosure can be realized in hardware or special purpose circuits, software, logic, or any combination thereof. Some aspects may be realized in hardware, while other aspects may be realized in firmware or software that can be executed by a controller, microprocessor, or other computing device. Although various aspects of the embodiments of the present disclosure have been illustrated and described using block diagrams, flow charts, or some other pictorial representations, it should be understood that the blocks, devices, systems, techniques, or methods described herein can be implemented, by way of non-limiting examples, in hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing device, or any combination thereof.

[0158] The present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer-readable storage medium. The computer program product includes computer-executable instructions, such as instructions included in a program module, that execute in a device on a target real or virtual processor to perform a process or method described above with reference to any one of the figures. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, etc. that perform particular tasks or implement particular abstract data types. In various embodiments, the functionality of the program modules may be combined or split between program modules as desired. The machine-executable instructions of the program modules may be executed in local or distributed devices. In a distributed device, the program modules may be located in both local and remote storage media.

[0159] Program codes for carrying out the methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, a special purpose computer, or other programmable data processing device, and when executed by the processor or controller, the program code causes the functions / acts specified in the flowcharts and / or block diagrams to be implemented. The program code may run entirely on the machine, partially on the machine, as a separate software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0160] The above program code may be implemented on a machine-readable medium, which may be any tangible medium that can contain or store a program used by or associated with an instruction execution system, device, or apparatus. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. The machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or apparatus, or any suitable combination of the aforementioned media. More specific examples of machine-readable storage media may include an electrical connection having one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable optical disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0161] It should be noted that although operations have been described in a particular order, it should not be understood that the operations need to be performed in the particular order shown, or in any sequential order, or that all of the operations described must be performed in order to achieve desired results. In some cases, multitasking or parallel processing may be advantageous. Similarly, although details of several specific embodiments are included in the above discussion, these should not be construed as limitations on the scope of the disclosure, but rather as descriptions of features that may be unique to certain embodiments. Some features described in the context of individual embodiments may be realized in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may be implemented in multiple embodiments separately or in any suitable subcombination.

[0162] Although the present disclosure has been described in language specific to structural features and / or methodological acts, it should be understood that the present disclosure, as defined in the appended claims, is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims

1. means for receiving a configuration including a first rank indicator (RI) limit; A terminal device comprising: a means for transmitting a channel state information (CSI) report based on the setting, The first RI restriction indicates a restriction on RI for one or more resource pairs in a channel state information reference signal (CSI-RS) resource set, the restriction including a RI pair, and a precoding matrix index (PMI) and a RI report for the CSI report are not allowed to correspond to the RI pair. Terminal device.

2. The CSI report includes a first CSI-RS resource indicator (CRI), the first CRI corresponding to a resource pair among the one or more resource pairs. The terminal device according to claim 1 .

3. The CSI report includes a first RI and a second RI; The first RI and the second RI correspond to a resource pair among the one or more resource pairs in the CSI-RS resource set. The terminal device according to claim 1 .

4. The first RI and the second RI are permitted subject to the first RI restrictions. The terminal device according to claim 3.

5. The bit size for the first CRI is ceil(log2(M)), where M is the number of CSI-RS resource pairs included in the CSI-RS resource set. The terminal device according to claim 2.

6. The CSI report further includes one CRI or two CRIs; If the CSI report further includes one CRI, the bit size for the one CRI is ceil(log2(N)); If the CSI report further includes two CRIs, a bit size for one of the two CRIs is ceil(log2(N1)) and a bit size for the other of the two CRIs is ceil(log2(N-N1)); N1 is the number of CSI-RS resources in a first subset of the CSI-RS resource set, N-N1 is the number of CSI-RS resources in a second subset of the CSI-RS resource set, and N is the number of CSI-RS resources in the CSI-RS resource set. The terminal device according to claim 2.

7. The configuration further includes a second RI limit, the bit size of the second RI limit being 8; The CSI report further includes a third RI; The second RI restriction indicates a restriction on an RI that is applied to the third RI associated with one CSI-RS resource in the CSI-RS resource set. The terminal device according to claim 1 .

8. means for transmitting a configuration including a first rank indicator (RI) limit; and means for receiving a channel state information (CSI) report based on the configuration, The first RI restriction indicates a restriction on RI for one or more resource pairs in a channel state information reference signal (CSI-RS) resource set, the restriction including a RI pair, and a precoding matrix index (PMI) and a RI report for the CSI report are not allowed to correspond to the RI pair. Network device.

9. The CSI report includes a first CSI-RS resource indicator (CRI), the first CRI corresponding to a resource pair among the one or more resource pairs. The network device according to claim 8.

10. The CSI report includes a first RI and a second RI; The first RI and the second RI correspond to a resource pair among the one or more resource pairs in the CSI-RS resource set. The network device according to claim 8.

11. The first RI and the second RI are permitted subject to the first RI restrictions. The network device according to claim 10.

12. The CSI report further includes one CRI or two CRIs; If the CSI report further includes one CRI, the bit size for the one CRI is ceil(log2(N)); If the CSI report further includes two CRIs, a bit size for one of the two CRIs is ceil(log2(N1)) and a bit size for the other of the two CRIs is ceil(log2(N-N1)); N1 is the number of CSI-RS resources in a first subset of the CSI-RS resource set, N-N1 is the number of CSI-RS resources in a second subset of the CSI-RS resource set, and N is the number of CSI-RS resources in the CSI-RS resource set.

10. The network device of claim 9.

13. The configuration further includes a second RI limit, the bit size of the second RI limit being 8; The CSI report further includes a third RI; The second RI restriction indicates a restriction on an RI that is applied to the third RI associated with one CSI-RS resource in the CSI-RS resource set. The network device according to claim 8.

14. Receiving a configuration including a first rank indicator (RI) limit; and transmitting a channel state information (CSI) report based on the configuration, The first RI restriction indicates a restriction on RI for one or more resource pairs in a channel state information reference signal (CSI-RS) resource set, the restriction including a RI pair, and a precoding matrix index (PMI) and a RI report for the CSI report are not allowed to correspond to the RI pair. method.

15. Transmitting a configuration including a first rank indicator (RI) limit; receiving a channel state information (CSI) report based on the configuration, The first RI restriction indicates a restriction on RI for one or more resource pairs in a channel state information reference signal (CSI-RS) resource set, the restriction including a RI pair, and a precoding matrix index (PMI) and a RI report for the CSI report are not allowed to correspond to the RI pair. method.

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