Channel measurement resource configuration supporting multi-TRP coherent joint transmission channel state information feedback

Abstract

An apparatus and method for TRP mapping configuration in communication of a user equipment (UE) with multiple transmit and receive points (TRPs) are provided. For multiple TRP (multi-TRP) coherent joint transmission (CJT) channel state information (CSI) reports, channel measurement resource (CMR) configuration may use CSI-RS port partitioning, CSI-RS resource set partitioning, or multiple CSI-RS resource sets.

Description

Technical Field

[0001] The present application generally relates to wireless communication systems, including multiple TRP (multi-TRP) coherent joint transmission (CJT) channel state information (CSI) reports. Background Art

[0002] Wireless mobile communication technologies use various standards and protocols to send data between base stations and wireless communication devices. Wireless communication system standards and protocols may include, for example, the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) (e.g., 4G), 3GPP New Radio (NR) (e.g., 5G), and the IEEE 802.11 standard for wireless local area networks (WLANs) (often referred to by industry groups as WLANs). ).

[0003] As envisioned by 3GPP, different wireless communication system standards and protocols may use various radio access networks (RANs) to communicate between base stations of the RAN (which may also sometimes be referred to as RAN nodes, network nodes, or simply nodes) and wireless communication devices referred to as user equipment (UE). 3GPP RANs may include, for example, Global System for Mobile Communications (GSM), Enhanced Data Rates for GSM Evolution (EDGE) RAN (GERAN), Universal Terrestrial Radio Access Network (UTRAN), Evolved Universal Terrestrial Radio Access Network (E-UTRAN), and / or Next Generation Radio Access Network (NG-RAN).

[0004] Each RAN may use one or more radio access technologies (RATs) for communication between base stations and UEs. For example, GERAN implements GSM and / or EDGE RAT, UTRAN implements Universal Mobile Telecommunications System (UMTS) RAT or other 3GPP RAT, E-UTRAN implements LTE RAT (sometimes referred to as LTE), and NG-RAN implements NR RAT (sometimes referred to as 5G RAT, 5G NR RAT, or simply NR in this document). In some deployments, E-UTRAN may also implement NR RAT. In some deployments, NG-RAN may also implement LTE RAT.

[0005] The base stations used by the RAN may correspond to the RAN. An example of an E-UTRAN base station is an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) Node B (also commonly denoted as an evolved Node B, enhanced Node B, eNodeB, or eNB). An example of an NG-RAN base station is a Next Generation Node B (also sometimes referred to as a gNodeB or gNB).

[0006] The RAN provides its communication services together with external entities through its connection with the Core Network (CN). For example, E-UTRAN may utilize the Evolved Packet Core (EPC) while NG-RAN may utilize the 5G Core Network (5GC). BRIEF DESCRIPTION OF THE DRAWINGS

[0007] To easily identify the discussion of any particular element or action, the most significant digit(s) in a reference number refers to the drawing number that first introduces the element.

[0008] Figure 1 The PMI matrix (codebook) used in certain embodiments herein is illustrated.

[0009] Figure 2 Illustrated are multiple TRP operations that may be used in accordance with certain embodiments disclosed herein.

[0010] Figure 3 A table showing possible antenna arrangements based on the number of CSI-RS ports according to one embodiment is illustrated.

[0011] Figure 4 An implementation according to one embodiment is illustrated in which the network configures which NZP-CSI-RS-Resources in a NZP-CSI-RS-ResourceSet share the same TRP.

[0012] Figure 5 Multiple groups of NZP-CSI-RS-Resources in a NZP-CSI-RS-ResourceSet according to one embodiment are illustrated.

[0013] Figure 6 CSI reporting with multiple resource sets according to one embodiment is illustrated, where each resource set is associated with a different TRP.

[0014] Figure 7 CSI reporting with multiple resource sets according to one embodiment is illustrated, where each resource set includes a group of CSI-RS resources, each CSI-RS resource belonging to a different TRP.

[0015] Figure 8 A flow chart of a method for a network node according to one embodiment is illustrated.

[0016] Fig. 9 A flow chart of a method for user equipment according to one embodiment is illustrated.

[0017] Fig.10 An example architecture of a wireless communication system according to embodiments disclosed herein is illustrated.

[0018] Fig.11 A system for performing signaling between a wireless device and a network device according to embodiments disclosed herein is illustrated. DETAILED DESCRIPTION

[0019] Various embodiments are described with reference to UE. However, reference to UE is provided for illustrative purposes only. The example embodiments may be used with any electronic component that can establish a connection with a network and is configured with hardware, software and / or firmware for exchanging information and data with the network. Therefore, UE as described herein is used to represent any suitable electronic component.

[0020] Many wireless communication standards provide for the use of known signals (e.g., pilot or reference signals) for a variety of purposes, such as synchronization, measurement, equalization, control, etc. For example, in cellular wireless communications, a reference signal (RS) may be provided to deliver a reference point for downlink power. When a wireless communication device or mobile device (i.e., UE) attempts to determine the downlink power (e.g., the power of a signal from a base station (such as an eNB for LTE and a gNB for NR)), the wireless communication device or mobile device measures the power of the reference signal and uses the power to determine the downlink cell power. The reference signal also assists the receiver in demodulating the received signal. Since the reference signal includes data known to both the transmitter and the receiver, the receiver can use the reference signal to determine / identify various characteristics of the communication channel. This is generally referred to as channel estimation, which is used in many high-end wireless communications such as LTE and 5G-NR communications. The known channel properties of a communication link in wireless communications are called channel state information (CSI), which provides information indicating the combined effects of, for example, scattering, fading, and power attenuation with distance. CSI makes it possible to adapt the transmission to the current channel conditions, which can be used to achieve reliable communication at high data rates in multi-antenna systems.

[0021] Typically, multi-antenna systems use precoding to improve communications. Precoding is an extension of beamforming that supports multi-stream (or multi-layer) transmission of multi-antenna wireless communications, and is used to control the difference in signal properties between corresponding signals sent from multiple antennas by modifying the signal sent from each antenna according to a precoding matrix. In a sense, precoding can be considered as a process of cross-coupling signals before transmission (in a closed-loop operation) to equalize the demodulation performance of each layer. The precoding matrix is ​​typically selected from a codebook defining a plurality of precoding matrix candidates, wherein the precoding matrix candidates are typically selected based on an expected performance level based on any one of a plurality of different factors, such as the current system configuration, the communication environment, and / or feedback information from a receiver (e.g., UE) receiving the transmitted signal.

[0022] The feedback information is used to select a precoding matrix candidate by defining the same codebook at both the transmitter and the receiver and using the feedback information from the receiver as an indication of a preferred precoding matrix. In such cases, the feedback information includes what is called a precoding matrix index (PMI), which may be based on properties of a signal received at the receiver. For example, the receiver may determine that the received signal has a relatively low signal-to-noise ratio (SNR), and may accordingly send a PMI that will replace the current precoding matrix with a new precoding matrix to increase the signal-to-noise ratio (SNR).

[0023] In 3GPP NR systems, two types of codebooks, Type I codebook and Type II codebook, have been standardized for CSI feedback supporting advanced MIMO operations. Both types of codebooks are constructed from beam grids based on two-dimensional (2D) discrete Fourier transform (DFT), thereby enabling CSI feedback for beam selection and in-phase combining based on phase shift keying (PSK) between two polarizations. CSI feedback based on Type II codebook also reports wideband and subband amplitude information for the selected beam, allowing more accurate CSI to be obtained. This in turn provides improved pre-coded MIMO transmission on the network.

[0024] For a multi-user multiple-input multiple-output (MIMO) system, a base station may configure multiple UEs (e.g., two UEs) to report their precoding matrices or precoding matrix candidates in mutually orthogonal directions. To reduce the CSI computation complexity of the UE, the base station may not consider certain unlikely beams based on uplink measurements, thereby allowing the UE to not test the precoders formed by those beams that are not considered. In other words, to reduce computational complexity, the base station may restrict the UE to narrow the search space based on UL measurements. Therefore, the UE does not have to consider the entire codebook.

[0025] For the 3GPP Release 15 (Rel-15) Type II port selection codebook, the beamformed channel state information reference signal (CSI-RS) exploits downlink (DL) and uplink (UL) channel reciprocity. For example, the base station estimates the UL channel and, based on channel reciprocity, obtains channel state information about the DL channel. Then, based on the DL channel information, the base station pre-codes different ports in the CSI-RS differently for the UE to perform further CSI reporting for CSI refinement. The UE measures the CSI-RS and provides feedback to the base station. For the total number of CSI-RS ports X, X / 2 ports are horizontally polarized (H-pol) and X / 2 ports are vertically polarized (V-pol). L CSI-RS ports are selected from the X / 2 CSI-RS ports. The first CSI-RS port can be selected for every d ports (e.g., d is 1 or 2 or 3 or 4). Then, continuous L (e.g., 1, 2, 4) ports are selected around.

[0026] 3GPP Rel-16 Type II port selection codebook enhancement uses the same port selection design as 3GPP Rel-15. When configuring sub-band PMI, the frequency domain DFT matrix can be used to compress the linear combination coefficients.

[0027] For the Type II port selection codebook, it may be assumed that the base station will precode the CSI-RS based on channel reciprocity (i.e., the DL channel is estimated based on the UL channel). For frequency division multiplexing (FDD), there may not be exact channel reciprocity, especially when the multiplexing distance is large. However, even for FDD, there may still be partial reciprocity when, for example, the angle of arrival or angle of departure between the DL carrier and the UL carrier are similar and / or the channel delay profiles between the DL carrier and the UL carrier are similar.

[0028] Figure 1 The PMI matrix (codebook) used in some embodiments of the present invention is illustrated. In the illustrated example, the type II port selection codebook structure is composed of (For simplicity, this paper also uses the symbol W = W1*W2*W f Or W = W1W2Wf), where W is the PMI matrix (also referred to as codebook in this article), W1 is the spatial basis selection matrix (also referred to as port selection matrix W1 in this article), W2 provides compressed combination coefficients, and W f is the frequency basis selection matrix, l is the layer index, N3 is the number of PMI subbands, L is the number of selected ports, M is the number of frequency bases, and H represents the Hermitian matrix or conjugate transpose operation. For simplicity, “W f ” or “Wf” assumes that Hermitian operations have been performed.

[0029] In some systems, for port selection codebook enhancement using DL / UL reciprocity of angle and / or delay, a codebook structure W = W1*W2*W is supported f , where the port selection matrix W1 is a free selection matrix and the identity matrix is ​​a special configuration. The frequency base selection matrix W f It is a compression matrix based on DFT, where N3 = N CQISubband *R and Mv>=1, where R is the size of the channel quality indicator (CQI) subband divided by the size of the PMI subband, and Mv is the number of selected frequency bases. N3 is the number of PMI subbands used for frequency base selection. At least one value of Mv>1 may be supported. In some such systems, the value of Mv may be explicit (e.g., Mv=2). In other embodiments, support for Mv>1 is a UE optional feature, taking into account UE complexity associated with codebook parameters. However, for candidate values ​​of R, mechanisms for configuring / indicating to the UE, and / or for the UE to select W fThe mechanism by which this selection / reporting occurs has not yet been determined. In addition or in other systems, W f Can be turned off by the base station. When turned off, W f Can be an all-ones vector.

[0030] In Rel-15, the Type II and Type II port selection codebooks are specified based on W1*W2. In Rel-16, the Type II and Type II port selection codebooks are specified based on W1*W2*W f Enhanced Type II and Type II port selection codebooks are specified.

[0031] In Rel-17, a further enhanced Type II port selection codebook is specified. For example, the CSI feedback in Rel-17 is further enhanced for non-coherent joint transmission (NCJT) of multiple transmit and receive point (TRP) operations (referred to as multi-TRP or mTRP). In some wireless networks, NCJT can be used to provide multiple-input multiple-output (MIMO), multi-user (MU) MIMO and / or coordinated multi-point (CoMP) communications. NCJT can come from multiple TRPs, multiple panels (multi-panels) of a TRP, or a combination thereof. Coherent joint transmission (CJT) uses synchronization between TRPs. However, for distributed TRPs, pre-decoders may not be jointly designed, and the TRPs are made unsynchronized. Instead, each TRP independently derives a pre-decoder without knowing the pre-decoders used by other TRPs. Therefore, the joint transmission is non-coherent. In Rel-17, the CSI feedback for NCJT of multiple TRPs is based on Type-I MIMO codebook, which only supports single downlink control information (DCI) multi-TRP NCJT scheme 1a (ie, spatial domain multiplexing).

[0032] In certain communication systems (e.g., Rel-18 NR), it may be desirable to provide CSI enhancements to support CJT of multiple TRPs. CJT assumes that multiple TRPs can jointly precode transmissions in a coherent manner. Some such systems may, for example, target frequency range 1 (FR1) and up to four TRPs, assuming ideal backhaul and synchronization and the same number of antenna ports across TRPs, as follows: Rel-16 / 17 Type II codebook refinement for CJT mTRP and its associated CSI reports targeting FDD, considering throughput-overhead tradeoff. In the current standard, the UE reports CSI for only one TRP for coherent transmissions.

[0033] Embodiments herein provide support for CSI reporting of CJT for multi-TRP CSI for up to multiple TRPs (e.g., four TRPs). To support CSI for CJT for multiple TRPs, the network may provide a channel measurement resource (CMR) configuration to the UE that identifies how the CMR should be associated with each TRP. The network node may configure a resource set, and configure multiple resources within the set, and configure multiple ports within the resource.

[0034] In NR, CSI is configured in CSI-ReportConfig. CMR resources are configured in CSI-ResourceConfig. For periodic and semi-persistent CSI, the carrier field in CSI-ReportConfig indicates the serving cell containing the CMR. In addition, resourcesForChannelMeasurement indicates which CMR resource set in CSI-ResourceConfig contains the CMR. For aperiodic CSI, CMR is additionally indicated in CSI-AssociatedReportConfigInfo.

[0035] CSI reporting for multiple TRPs can be performed at any level of the CMR hierarchy (e.g., multiple resource sets, resources within a resource set, or ports within a resource). For example, the CMR configuration can use CSI-RS port segmentation, CSI-RS resource set segmentation, and / or multiple CSI-RS resource sets. For CSI-RS port segmentation, in one embodiment, each resource can include multiple ports (e.g., up to 32 ports). The network can assign different ports to different TRPs. The network can indicate to the UE that the first channel measurement should belong to the first TRP and the second channel measurement should belong to the second TRP. In some embodiments, the network can use CSI-RS resource set segmentation by associating all ports in the resource with a TRP and associating all ports in other resources with different TRPs. In some embodiments, the network can also use multiple CSI-RS resource sets and associate different TRPs with each resource set in the CSI-RS resource set.

[0036] Figure 2204. A multi-TRP operation that may be used in accordance with certain embodiments disclosed herein is illustrated. A UE 202 receives signals from four TRPs 204. Each TRP includes an antenna panel 206 having eight ports (i.e., antenna elements), where four of the ports are V-pol and four of the ports are H-pol. For example, a cross-polarized antenna may include a V-pol port 208 and an H-pol port 210. Thus, the four TRPs 204 use a combined total of 32 ports. CSI-RS port segmentation may be used for port-to-TRP mapping for CMR configuration of a multi-TRP CJT.

[0037] In some embodiments of CMR configuration for multi-TRP CJT, each CSI report configuration (e.g., CSI-ReportConfig) is associated with only one resource set (e.g., NZP-CSI-RS-ResourceSet). In addition, each resource set (e.g., NZP-CSI-RS-ResourceSet) may include one or more resources (e.g., NZP-CSI-RS-Resource). In addition, each resource (e.g., NZP-CSI-RS-Resource) may include multiple ports. In these embodiments, multiple ports of one or more resources of a single resource set may be mapped to TRP 204.

[0038] The port to TRP mapping (e.g., NZP-CSI-RS-Resource) for each resource in one or more resources can be hard-coded and / or configured by the network. The port to TRP mapping indicates which ports belong to the same TRP. In some embodiments, the port to TRP mapping for resources is hard-coded in the specification based on a limited number of deployment options. In some embodiments, the port to TRP mapping for resources is configured by the network node through radio resource control (RRC) signaling or media access control (MAC) control element (CE). In some embodiments, the port to TRP mapping is configured by a combination of hard-coded deployment selection and network configuration. For example, several deployment selections can be hard-coded in the specification, and the network node can use RRC signaling or MAC CE to indicate to the UE which deployment selection to use.

[0039] Figure 3 An example of a CMR configuration for multiple TRPs using CSI-RS port segmentation on a single resource according to one embodiment is illustrated. In the illustrated embodiment, the port-to-TRP mapping is hard-coded in the specification. For each NZP-CSI-RS-Resource, the UE and the network node can use a predefined port-to-TRP mapping configuration for each antenna arrangement 308.

[0040] The port-to-TRP mapping configuration may be determined by the UE and the network node based on the antenna arrangement 308. The antenna arrangement 308 is determined by three factors (N g , N1 and N2) are defined. g is the number of TRPs, N1 is the number of V-Pol / H-Pol pairs per TRP vertical, and N2 is the number of V-Pol / H-Pol pairs per TRP horizontal. Therefore, the UE and the network node can determine the port to TRP mapping configuration based on these three factors.

[0041] Figure 3 A table 302 is included showing all possible antenna arrangements based on the number of CSI-RS ports 306. For each number of CSI-RS ports 306, one or more antenna arrangements 308 are possible. For example, for a network system including four ports across multiple TRPs, there is only one arrangement (i.e., (2,1,1)). In this arrangement, there are two TRPs, each with one element, and each element has a V-Pol / H-Pol pairing.

[0042] As another example, a network system with 32 ports may use two or four TRPs. In the case of using two TRPs, the antenna panel for each TRP may be arranged with four vertical V-Pol / H-Pol pairs and two horizontal V-Pol / H-Pol pairs, or eight vertical V-Pol / H-Pol pairs and one horizontal V-Pol / H-Pol pair. When there is more than one option, the network may indicate to the UE which antenna arrangement to use 308.

[0043] For each antenna arrangement 308, there may be a hard-coded port-to-TRP mapping configuration. For example, the port-to-TRP mapping 304 illustrates an embodiment of the mapping for a (4,2,2) antenna arrangement. The (4,2,2) antenna arrangement is Figure 2 The network node may configure a resource set with one or more resources, which may have multiple ports. The network node may inform the UE of the number of ports and the antenna arrangement 308. The UE uses the port to TRP mapping 304 to determine which TRP is using which port.

[0044] As illustrated, the port-to-TRP mapping 304 can divide the 32 ports into four groups, each of which contains eight ports. The groups of ports can be associated with TRPs. For example, in the illustrated port-to-TRP mapping 304, CSI-RS ports 0-3 are associated with the V-Pol of TRP 0, CSI-RS ports 4-7 are associated with the V-Pol of TRP 1, and so on. The UE can measure and provide CSI reports for CSI resource sets based on the port-to-TRP mapping 304.

[0045] For CMR configurations for multi-TRP CJTs, for each NZP-CSI-RS-Resource, the port-to-TRP mapping (e.g., port-to-TRP mapping 304) may be partially configured by the network. For example, in some embodiments, the network node only configures N g and N1 parameters, and sequentially determine the port-to-TRP mapping. Note that N2 can be determined by the total number of CSI-RS ports (i.e., P CSI-RS ) and N g and N1 inferred. For example, N2 can be inferred based on the following equation: N2 = P CSI-RS / 2 / N g / N1. The order of port-to-TRP mapping may be determined such that the first portion of CSI-RS ports is mapped to the first TRP, the second portion of CSI-RS ports is mapped to the second TRP, etc. In other words, each group of CSI-RS ports is sequentially assigned to a TRP.

[0046] For example, in some embodiments, in the first P CSI-RS Of the 2 CSI-RS ports, the first N1*N2 ports belong to the V-pol of the first TRP, and the next N1*N2 ports belong to the V-pol of the second TRP, and so on. CSI-RS / 2 CSI-RS ports, the first N1*N2 ports belong to the H-pol of the first TRP, and the next N1*N2 ports belong to the H-pol of the second TRP, and so on.

[0047] In some embodiments, the mapping of CSI-RS ports to TRPs can be explicitly configured by the network node. The mapping of CSI-RS ports to TRPs may not always be sequential. Taking two TRPs with eight ports as an example, ports (0, 2) can be mapped to the V-Pol of the first TRP, ports (4, 6) can be mapped to the H-Pol of the first TRP, ports (1, 3) can be mapped to the V-Pol of the second TRP, and ports (5, 7) can be mapped to the H-Pol of the second TRP.

[0048] In some embodiments, the network may configure a port-to-TRP mapping (e.g., NZP-CSI-RS-Resource) for a CMR configuration of a multi-TRP CJT for each CSI-RS resource to use existing groupings to indicate which ports belong to the same TRP. For example, a network node may configure a code division multiplexing (CDM) group for a CSI-RS port. The UE and the network node may associate CSI-RS ports in the same CDM group with the same TRP.

[0049] For a CMR configuration of a multi-TRP CJT, for each NZP-CSI-RS-Resource, the port or antenna configuration of each TRP has the following options. In some embodiments, the antenna configuration (e.g., antenna arrangement 308) of each TRP must be the same. In other words, N1 and N2 are the same values ​​for each TRP.

[0050] In some embodiments, the antenna configuration of each TRP may be different. In other words, N1 and N2 may be different for each TRP. For example, a wireless communication system may include four TRs with a total of 32 ports. Some TRPs may have an antenna configuration of (N1=4 and N2=1), while other TRPs may have an antenna configuration of (N1=2 and N2=2). The network node may inform the UE of different antenna configurations for different TRPs.

[0051] Some embodiments may use CSI-RS resource set partitioning. For CSI-RS resource partitioning, a resource set may include one or more CSI-RS resources with multiple ports. Each CSI-RS resource may be associated with a TRP. In other words, all ports in one CSI-RS resource may be associated with the first TRP, and ports from additional resources may be associated with different TRPs. For example, for a CMR configuration for multi-TRP CJT, each CSI-ReportConfig may be associated with only one NZP-CSI-RS-ResourceSet, and each NZP-CSI-RS-ResourceSet may contain one or more NZP-CSI-RS-Resources, and in some embodiments, each different NZP-CSI-RS-Resource is associated with a different TRP.

[0052] There are several ways in which a CSI-RS resource set may be partitioned for CSI-RS resource set partitioning. CSI-RS resource set partitioning may be configured by the network. In some embodiments, the network may associate multiple CSI-RS resources with a TRP.

[0053] For example, Figure 4An implementation is illustrated in which the network configures which NZP-CSI-RS-Resources (e.g., CSI-RS 0 404, CSI-RS1 406, CSI-RS2 408, CSI-RS 3 410, CSI-RS 4 412, CSI-RS 5 414, CSI-RS 6 416, and CSI-RS 7 418) in NZP-CSI-RS-ResourceSet 402 share the same TRP. A network node is able to flexibly allocate multiple resources to a TRP, such as the illustrated pairing. The network node may transmit a configuration that informs the UE which CSI-RS resources should be associated with which TRP. The UE may independently indicate a preferred CSI-RS for each TRP. For example, the UE may transmit a CSI-RS resource indicator (CRI) in a CSI report.

[0054] For example, in the illustrated embodiment, the network node configures pairing of CSI-RS resources for a set of four TRPs. The first TRP is associated with CSI-RS 0 404 and CSI-RS 4 412. The second TRP is associated with CSI-RS1 406 and CSI-RS 5 414. The third TRP is associated with CSI-RS2 408 and CSI-RS 6 416. The fourth TRP is associated with CSI-RS 3 410 and CSI-RS7 418.

[0055] The UE may measure the pairing of CSI-RS resources and report a preference for which CSI-RS resource should be used for each TRP. In some embodiments, in order to report the preferred CSI-RS (e.g., CRI in the CSI report), the UE independently selects the CSI-RS for each TRP. For example, for the first TRP, the UE may indicate a preference for CSI-RS 0 404, for the second TRP, the UE may indicate a preference for CSI-RS 5 414, for the third TRP, the UE may indicate a preference for CSI-RS 6 416, and for the fourth TRP, the UE may indicate a preference for CSI-RS 3 410.

[0056] In some embodiments, the network may configure CSI-RS resources into resource groups, where each resource group includes CSI-RS resources for each TRP. Figure 5, the network node is indicating multiple groups (e.g., a first group 504 and a second group 506) of NZP-CSI-RS-Resources in NZP-CSI-RS-ResourceSet 502. Each group contains NZP-CSI-RS-Resources from a different TRP, so that the group contains CS-RS resources for each TRP. To report a preferred CSI-RS (e.g., CRI in a CSI report), the UE selects which group it prefers and informs the network node.

[0057] For example, in the first group 504, the first TRP may be associated with CSI-RS 0, the second TRP may be associated with CSI-RS 1, the third TRP may be associated with CSI-RS 2, and the fourth TRP may be associated with CSI-RS 3. In the second group 506, the first TRP may be associated with CSI-RS 4, the second TRP may be associated with CSI-RS 5, the third TRP may be associated with CSI-RS 6, and the fourth TRP may be associated with CSI-RS 7. The network node may inform the UE of the configuration. The UE may report to the network node whether it prefers the first group 504 or the second group 506.

[0058] When the network indicates multiple groups of NZP-CSI-RS-Resources in the NZP-CSI-RS-ResourceSet, each group may contain NZP-CSI-RS-Resources from different TRPs. In some embodiments, within the same group of NZP-CSI-RS-Resources, all NZP-CSI-RS-Resources may have to be configured with the same number of ports. In some embodiments, across different groups of NZP-CSI-RS-Resources, all NZP-CSI-RS-Resources may have to be configured with the same number of ports. In some embodiments, different groups of NZP-CSI-RS-Resources may be configured with different numbers of ports.

[0059] Figure 6 and Figure 7 CSI reporting of multiple CSI-RS resource sets using CMR configuration for multi-TRP CJT is illustrated. These embodiments use multiple CSI-RS resource sets to support multiple TRPs. Therefore, multiple TRPs can be supported at the resource level.

[0060] More specifically, Figure 6A CSI report 602 with multiple resource sets 604 is illustrated, where each resource set is associated with a different TRP. In other words, for a CMR configuration for multi-TRP CJT, each CSI-ReportConfig may be associated with one or more NZP-CSI-RS-ResourceSets, and each NZP-CSI-RS-ResourceSet may be mapped to one TRP.

[0061] All resources within a resource set may be mapped to a single TRP. For example, in the illustrated embodiment, NZP-CSI-RS-ResourceSet 0 is mapped to TRP 0, NZP-CSI-RS-ResourceSet 1 is mapped to TRP 1, NZP-CSI-RS-ResourceSet 2 is mapped to TRP 2, and NZP-CSI-RS-ResourceSet 3 is mapped to TRP 3. In some embodiments, multiple resource sets may be configured with the same number of resources, and each resource may be configured with the same number of ports. For example, each of the four illustrated NZP-CSI-RS-ResourceSets may be configured with the same number of CSI-RS-Resources (e.g., two) and each CSI-RS-Resource may be configured with the same number of ports.

[0062] Figure 7 A CSI report 702 with multiple resource sets 704 is illustrated, where each resource set includes a group of CSI-RS resources, each CSI-RS resource belonging to a different TRP. For example, in the illustrated embodiment, NZP-CSI-RS-ResourceSet 0 includes CSI-RS 0, CSI-RS1, CSI-RS 2, and CSI-RS 3. Each CSI-RS is from a different TRP. For example, CSI-RS 0 can be mapped to TRP 0, CSI-RS1 can be mapped to TRP 1, CSI-RS2 can be mapped to TRP 2, and CSI-RS 3 can be mapped to TRP 3. Similarly, NZP-CSI-RS-ResourceSet 1 includes CSI-RS4, CSI-RS 5, CSI-RS 6, and CSI-RS 7. Each CSI-RS is from a different TRP. For example, CSI-RS 4 may be mapped to TRP 0, CSI-RS 5 may be mapped to TRP 1, CSI-RS 6 may be mapped to TRP 2, and CSI-RS 7 may be mapped to TRP 3.

[0063] for Figure 6 and Figure 7In the two embodiments illustrated in FIG. 1 , the UE may indicate a preferred CSI-RS for a TRP in a variety of ways. In some embodiments, different and independent indices of the CSI-RS may be reported by the UE for different resource sets (e.g., each NZP-CSI-RS-ResourceSet). For example, in Figure 6 In the example, there are 16 possible CSI-RS combinations. The UE may transmit a report for each possibility. In some embodiments, a single index of the CSI-RS may be reported by the UE, where the NZP-CSI-RS-ResourceSet (TRP) selects the same CSI-RS index. For example, the UE may Figure 6 It indicates whether the first CSI-RS of each resource set is preferred or whether the second CSI-RS of each resource set is preferred.

[0064] In some embodiments, for CMR configuration of multi-TRP CJT, for type IICSI reporting, only one CSI-RS resource per TRP may be configured in each CSI-ReportConfig. In these embodiments, the UE does not report CRI in type IICSI. The selection of CSI-RS-Resource is automatic because there is only one resource per TRP. This can reduce overhead and simplify UE implementation.

[0065] In some embodiments, each NZP-CSI-RS-ResourceSet should have the same time domain behavior (e.g., periodic, or semi-periodic, or aperiodic). In other words, all CSI-RS resource sets can be periodic, semi-periodic, or aperiodic. The time domain behavior can be configured by RRC.

[0066] In some embodiments, for CMR measurements of multi-TRP CJT, CMRs from each of the different TRPs may have time domain restrictions. Time domain restrictions may make transmissions more time compact. In some embodiments, all CMRs from different TRPs must be included in the same CDRX active time. In some embodiments, all CMRs from different TRPs must be included in the same time slot. In some embodiments, all CMRs from different TRPs must be included in the time domain window without duplex direction changes between transmissions from each TRP.

[0067] Figure 8A flow chart of a method 800 for a network node is illustrated. The network node may generate 802 a CMR configuration to support multi-TRP CJT reporting. The CMR configuration may include features from the embodiments discussed in the previous figures. The network node may transmit 804 the CMR configuration to a UE. The CMR configuration may map a port, resource, or resource set to multiple TRPs using CSI-RS port partitioning, CSI-RS resource set partitioning, or multiple CSI-RS resource sets, as discussed with reference to the previous figures. The network node may transmit 806 one or more CSI-RSs to the UE. The network node may receive 808 multi-TRP CJT CSI reporting information from the UE. The network node may transmit 810 a transmission (e.g., PDSCH) to the UE based on the multi-TRP CJT CSI reporting information.

[0068] Embodiments contemplated herein include an apparatus comprising means for performing one or more elements of method 800. For example, the apparatus may be an apparatus of a base station (such as network device 1118 as a base station, as described herein).

[0069] Embodiments contemplated herein include one or more non-transitory computer-readable media including instructions that, when executed by one or more processors of an electronic device, cause the electronic device to perform one or more elements of method 800. For example, the non-transitory computer-readable medium may be a memory of a base station (such as memory 1122 of network device 1118 acting as a base station, as described herein).

[0070] Embodiments contemplated herein include an apparatus comprising logic, modules, or circuits operable to perform one or more elements of method 800. For example, the apparatus may be an apparatus of a base station (such as network device 1118 as a base station, as described herein).

[0071] Embodiments contemplated herein include an apparatus comprising: one or more processors and one or more computer-readable media, the computer-readable media comprising instructions that, when executed by the one or more processors, cause the one or more processors to perform one or more elements of method 800. For example, the apparatus may be an apparatus of a base station (such as network device 1118 as a base station, as described herein).

[0072] Embodiments contemplated herein include a signal as described in or in connection with one or more elements of method 800 .

[0073] Embodiments contemplated herein include a computer program or computer program product including instructions, wherein execution of the program by a processing element causes the processing element to perform one or more elements of method 800. The processor may be a processor of a base station (such as processor 1120 of network device 1118 as a base station, as described herein). For example, the instructions may be located in a processor and / or on a memory of a base station (such as memory 1122 of network device 1118 as a base station, as described herein).

[0074] Fig. 9 A flow chart of a method 900 for a UE is illustrated. The UE may receive 902 a CMR configuration to support multi-TRP CJT reporting. The CMR configuration may include features from the embodiments discussed in the previous figures. For example, the CMR configuration may map a port, resource, or resource set to multiple TRPs using CSI-RS port splitting, CSI-RS resource set splitting, or multiple CSI-RS resource sets, as discussed with reference to the previous figures. The UE may receive 904 one or more CSI-RS from multiple TRPs to the UE from a network node. The UE may report 906 multi-TRP CJT CSI reporting information to the network node. The CSI report may be constructed as discussed with reference to the previous figures.

[0075] Embodiments contemplated herein include an apparatus comprising means for performing one or more elements of method 900. The apparatus may be, for example, an apparatus that is a UE (such as wireless device 1102 as a UE, as described herein).

[0076] Embodiments contemplated herein include one or more non-transitory computer-readable media including instructions that, when executed by one or more processors of an electronic device, cause the electronic device to perform one or more elements of method 900. The non-transitory computer-readable medium may be, for example, a memory of a UE (such as memory 1106 of wireless device 1102 as a UE, as described herein).

[0077] Embodiments contemplated herein include an apparatus comprising logic, modules, or circuits for performing one or more elements of the method 900. The apparatus may be, for example, an apparatus of a UE (such as the wireless device 1102 as a UE, as described herein).

[0078] Embodiments contemplated herein include an apparatus comprising: one or more processors and one or more computer-readable media comprising instructions that, when executed by the one or more processors, cause the one or more processors to perform one or more elements of method 900. The apparatus may be, for example, an apparatus of a UE (such as wireless device 1102 as a UE, as described herein).

[0079] Embodiments contemplated herein include a signal as described in or in connection with one or more elements of method 900 .

[0080] Embodiments contemplated herein include a computer program or computer program product including instructions, wherein execution of the program by a processor causes the processor to perform one or more elements of method 900. The processor may be a processor of a UE (such as processor 1104 of wireless device 1102 as a UE, as described herein). These instructions may be located, for example, in a processor and / or on a memory of a UE (such as memory 1106 of wireless device 1102 as a UE, as described herein).

[0081] Fig.10 An example architecture of a wireless communication system 1000 according to an embodiment disclosed herein is illustrated. The description provided below is for an example wireless communication system 1000 operating in conjunction with the LTE system standard and / or the 5G or NR system standard provided in the 3GPP technical specifications.

[0082] like Fig.10 As shown, the wireless communication system 1000 includes UE 1002 and UE 1004 (although any number of UEs may be used). In this example, UE 1002 and UE 1004 are illustrated as smartphones (e.g., handheld touch screen mobile computing devices capable of connecting to one or more cellular networks), but may also include any mobile or non-mobile computing device configured for wireless communication.

[0083] UE 1002 and UE 1004 may be configured to be communicatively coupled with RAN 1006. In an embodiment, RAN 1006 may be NG-RAN, E-UTRAN, etc. UE 1002 and UE 1004 utilize connections (or channels) (shown as connection 1008 and connection 1010, respectively) with RAN 1006, where each connection (or channel) includes a physical communication interface. RAN 1006 may include one or more base stations, such as base station 1012 and base station 1014, to implement connection 1008 and connection 1010.

[0084] In this example, connection 1008 and connection 1010 are air interfaces that enable such communicative coupling and may conform to the RAT used by RAN 1006, such as, for example, LTE and / or NR.

[0085] In some embodiments, UE 1002 and UE 1004 may also directly exchange communication data via side link interface 1016. UE 1004 is shown as being configured to access an access point (shown as AP 1018) via connection 1020. By way of example, connection 1020 may include a local wireless connection, such as a connection conforming to any IEEE 802.11 protocol, wherein AP 1018 may include In this example, AP 1018 may not be connected to another network (eg, the Internet) through CN 1024.

[0086] In an embodiment, UE 1002 and UE 1004 may be configured to communicate with each other or with base station 1012 and / or base station 1014 over a multi-carrier communication channel using orthogonal frequency division multiplexing (OFDM) communication signals according to various communication techniques, such as, but not limited to, orthogonal frequency division multiple access (OFDMA) communication techniques (e.g., for downlink communication) or single carrier frequency division multiple access (SC-FDMA) communication techniques (e.g., for uplink and ProSe or sidelink communication), although the scope of the embodiment is not limited in this respect. The OFDM signal may include multiple orthogonal subcarriers.

[0087] In some embodiments, all or part of base station 1012 or base station 1014 may be implemented as one or more software entities running on a server computer as part of a virtual network. In addition, or in other embodiments, base station 1012 or base station 1014 may be configured to communicate with each other via interface 1022. In an embodiment where wireless communication system 1000 is an LTE system (e.g., when CN 1024 is EPC), interface 1022 may be an X2 interface. The X2 interface may be defined between two or more base stations (e.g., two or more eNBs, etc.) connected to EPC and / or between two eNBs connected to EPC. In an embodiment where wireless communication system 1000 is an NR system (e.g., when CN 1024 is 5GC), interface 1022 may be an Xn interface. The Xn interface is defined between two or more base stations (e.g., two or more gNBs, etc.) connected to 5GC, between base station 1012 (e.g., gNB) and eNB connected to 5GC, and / or between two eNBs connected to 5GC (e.g., CN 1024).

[0088] The RAN 1006 is shown as being communicatively coupled to the CN 1024. The CN 1024 may include one or more network elements 1026 configured to provide various data and telecommunication services to customers / subscribers (e.g., UE 1002 and users of UE 1004) connected to the CN 1024 via the RAN 1006. The components of the CN 1024 may be implemented in one physical device or separate physical devices including components for reading and executing instructions from a machine-readable or computer-readable medium (e.g., a non-transitory machine-readable storage medium).

[0089] In an embodiment, CN 1024 may be an EPC, and RAN 1006 may be connected to CN 1024 via an S1 interface 1028. In an embodiment, S1 interface 1028 may be divided into two parts: an S1 user plane (S1-U) interface that carries traffic data between base station 1012 or base station 1014 and a serving gateway (S-GW); and an S1-MME interface that is a signaling interface between base station 1012 or base station 1014 and a mobility management entity (MME).

[0090] In an embodiment, CN 1024 may be a 5GC, and RAN 1006 may be connected to CN 1024 via an NG interface 1028. In an embodiment, NG interface 1028 may be divided into two parts: an NG user plane (NG-U) interface that carries traffic data between base station 1012 or base station 1014 and a user plane function (UPF); and an S1 control plane (NG-C) interface that is a signaling interface between base station 1012 or base station 1014 and an access and mobility management function (AMF).

[0091] In general, the application server 1030 may be an element that provides applications that use Internet Protocol (IP) bearer resources with the CN 1024 (e.g., packet-switched data services). The application server 1030 may also be configured to support one or more communication services (e.g., VoIP sessions, group communication sessions, etc.) for the UE 1002 and UE 1004 via the CN 1024. The application server 1030 may communicate with the CN 1024 via the IP communication interface 1032.

[0092] Fig.11A system 1100 for performing signaling 1134 between a wireless device 1102 and a network device 1118 according to an embodiment disclosed herein is illustrated. The system 1100 may be part of a wireless communication system as described herein. The wireless device 1102 may be, for example, a UE of a wireless communication system. The network device 1118 may be, for example, a base station (e.g., an eNB or a gNB) of a wireless communication system.

[0093] The wireless device 1102 may include one or more processors 1104. The processor 1104 may execute instructions to cause various operations of the wireless device 1102 to be performed, as described herein. The processor 1104 may include one or more baseband processors implemented using, for example, a central processing unit (CPU), a digital signal processor (DSP), an application specific integrated circuit (ASIC), a controller, a field programmable gate array (FPGA) device, another hardware device, a firmware device, or any combination thereof for performing the operations described herein.

[0094] The wireless device 1102 may include a memory 1106. The memory 1106 may be a non-transitory computer-readable storage medium storing instructions 1108 (which may include, for example, instructions executed by the processor 1104). The instructions 1108 may also be referred to as program code or a computer program. The memory 1106 may also store data used by the processor 1104 and results calculated by the processor.

[0095] The wireless device 1102 may include one or more transceivers 1110, which may include radio frequency (RF) transmitter and / or receiver circuitry that uses an antenna 1112 of the wireless device 1102 to facilitate signaling (e.g., signaling 1134) transmitted and / or received by the wireless device 1102 with other devices (e.g., network device 1118) according to a corresponding RAT.

[0096] The wireless device 1102 may include one or more antennas 1112 (e.g., one, two, four, or more). For implementations with multiple antennas 1112, the wireless device 1102 may take advantage of the spatial diversity of these multiple antennas 1112 to transmit and / or receive multiple different data streams on the same time-frequency resources. This behavior may be referred to as, for example, multiple-input multiple-output (MIMO) behavior (referring to the multiple antennas used at each of the transmitting device and the receiving device to implement this aspect). The MIMO transmission by the wireless device 1102 may be implemented based on precoding (or digital beamforming) applied to the wireless device 1102, which multiplexes the data streams between the antennas 1112 based on known or assumed channel characteristics, so that each data stream is received with appropriate signal strength relative to the other streams and at a desired position in the spatial domain (e.g., the position of the receiver associated with the data stream). Certain embodiments may use a single-user MIMO (SU-MIMO) approach (where data streams are all directed to a single receiver) and / or a multi-user MIMO (MU-MIMO) approach (where separate data streams may be directed to separate (different) receivers in different locations in the spatial domain).

[0097] In certain embodiments with multiple antennas, the wireless device 1102 may implement analog beamforming techniques whereby the phases of signals transmitted by the antennas 1112 are relatively adjusted so that the (joint) transmissions of the antennas 1112 may be directional (this is sometimes referred to as beam steering).

[0098] The wireless device 1102 may include one or more interfaces 1114. The interface 1114 may be used to provide input or output to the wireless device 1102. For example, a wireless device 1102 that is a UE may include an interface 1114, such as a microphone, a speaker, a touch screen, buttons, etc., to allow a user of the UE to input and / or output to the UE. Other interfaces of such a UE may be composed of transmitters, receivers, and other circuits that allow the UE to communicate with other devices (e.g., in addition to the transceiver 1110 / antenna 1112 described above), and may communicate according to known protocols (e.g., etc.) to perform the operation.

[0099] The wireless device 1102 may include a CSI module 1116. The CSI module 1116 may be implemented via hardware, software, or a combination thereof. For example, the CSI module 1116 may be implemented as a processor, circuit, and / or instructions 1108 stored in the memory 1106 and executed by the processor 1104. In some examples, the CSI module 1116 may be integrated within the processor 1104 and / or the transceiver 1110. For example, the CSI module 1116 may be implemented by a combination of software components (e.g., executed by a DSP or a general purpose processor) and hardware components (e.g., logic gates and circuit systems) within the processor 1104 or the transceiver 1110.

[0100] The CSI module 1116 may be used in various aspects of the present disclosure, for example, Figures 1 to 9 The CSI module 1116 is configured to provide multi-TRP coherent joint transmission CSI feedback.

[0101] The network device 1118 may include one or more processors 1120. The processor 1120 may execute instructions to cause various operations of the network device 1118 to be performed, as described herein. The processor 1120 may include one or more baseband processors implemented using, for example, a CPU, a DSP, an ASIC, a controller, an FPGA device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein.

[0102] The network device 1118 may include a memory 1122. The memory 1122 may be a non-transitory computer-readable storage medium that stores instructions 1124 (which may include, for example, instructions executed by the processor 1120). The instructions 1124 may also be referred to as program code or a computer program. The memory 1122 may also store data used by the processor 1120 and results calculated by the processor.

[0103] The network device 1118 may include one or more transceivers 1126, which may include RF transmitter and / or receiver circuits that use an antenna 1128 of the network device 1118 to facilitate signaling (e.g., signaling 1134) to and / or from the network device 1118 with other devices (e.g., wireless device 1102) according to a corresponding RAT.

[0104] The network device 1118 may include one or more antennas 1128 (e.g., one, two, four, or more). In embodiments with multiple antennas 1128, the network device 1118 may perform MIMO, digital beamforming, analog beamforming, beam steering, etc. as described above.

[0105] The network device 1118 may include one or more interfaces 1130. The interface 1130 may be used to provide input to or output from the network device 1118. For example, a network device 1118 that is a base station may include an interface 1130 consisting of a transmitter, a receiver, and other circuits (e.g., in addition to the transceiver 1126 / antenna 1128 that has been described), which enables the base station to communicate with other equipment in the core network and / or enables the base station to communicate with an external network, computer, database, etc., for the purpose of operating, managing, and maintaining the base station or other equipment that is operably connected to the base station.

[0106] The network device 1118 may include a CMR configuration module 1132. The CMR configuration module 1132 may be implemented via hardware, software, or a combination thereof. For example, the CMR configuration module 1132 may be implemented as a processor, circuit, and / or instructions 1124 stored in the memory 1122 and executed by the processor 1120. In some examples, the CMR configuration module 1132 may be integrated within the processor 1120 and / or the transceiver 1126. For example, the CMR configuration module 1132 may be implemented by a combination of software components (e.g., executed by a DSP or a general purpose processor) and hardware components (e.g., logic gates and circuit systems) within the processor 1120 or the transceiver 1126.

[0107] The CMR configuration module 1132 may be used in various aspects of the present disclosure, for example, Figures 1 to 9 The CMR configuration module 1132 is configured to generate a CMR configuration to support coherent joint transmission of CSI feedback by multiple TRPs.

[0108] For one or more embodiments, at least one of the components set forth in one or more of the foregoing figures may be configured to perform one or more operations, techniques, processes and / or methods as set forth herein. For example, a baseband processor as described herein in conjunction with one or more of the foregoing figures may be configured to operate according to one or more of the examples set forth herein. For another example, circuits associated with a UE, a base station, a network element, etc. as described above in conjunction with one or more of the foregoing figures may be configured to operate according to one or more of the examples set forth herein.

[0109] Unless otherwise expressly stated, any of the above embodiments may be combined with any other embodiment (or combination of embodiments). The foregoing description of one or more specific implementations provides illustration and description, but is not intended to be exhaustive or to limit the scope of the embodiments to the precise form disclosed. In view of the above teachings, modifications and variations are possible, or can be obtained from the practice of various embodiments.

[0110] Embodiments and implementations of the systems and methods described herein may include various operations that may be embodied in machine executable instructions to be executed by a computer system. A computer system may include one or more general or special purpose computers (or other electronic devices). A computer system may include hardware components that include specific logic components for performing operations; or may include a combination of hardware, software, and / or firmware.

[0111] It should be appreciated that the systems described herein include descriptions of specific embodiments. These embodiments may be combined into a single system, partially combined into other systems, separated into multiple systems, or otherwise divided or combined. In addition, it is contemplated that parameters, attributes, aspects, etc. of another embodiment may be used in one embodiment. For clarity, these parameters, attributes, aspects, etc. are described only in one or more embodiments, and it should be appreciated that these parameters, attributes, aspects, etc. may be combined with or substituted for parameters, attributes, aspects, etc. of another embodiment unless expressly stated herein.

[0112] It is understood that the use of personally identifiable information should be subject to privacy policies and practices that are generally recognized to meet or exceed industry or government requirements for maintaining user privacy. Specifically, personally identifiable information data should be managed and processed to minimize the risk of unintentional or unauthorized access or use, and the nature of the authorized use should be clearly stated to users.

[0113] Although the foregoing has been described in considerable detail for the sake of clarity, it will be apparent that certain changes and modifications may be made without departing from the principles of the present disclosure. It should be noted that there are many alternative ways of implementing both the processes and the apparatus described herein. Therefore, the embodiments of the present disclosure should be regarded as illustrative rather than restrictive, and the specification is not limited to the details given herein, but may be modified within the scope and equivalents of the appended claims.

[0114] For one or more embodiments, at least one of the components set forth in one or more of the foregoing figures may be configured to perform one or more operations, techniques, processes and / or methods as set forth herein. For example, a baseband processor as described herein in conjunction with one or more of the foregoing figures may be configured to operate according to one or more of the examples set forth herein. For another example, circuits associated with a UE, a base station, a network element, etc. as described above in conjunction with one or more of the foregoing figures may be configured to operate according to one or more of the examples set forth herein.

[0115] Unless otherwise expressly stated, any of the above embodiments may be combined with any other embodiment (or combination of embodiments). The foregoing description of one or more specific implementations provides illustration and description, but is not intended to be exhaustive or to limit the scope of the embodiments to the precise form disclosed. In view of the above teachings, modifications and variations are possible, or can be obtained from the practice of various embodiments.

[0116] Embodiments and implementations of the systems and methods described herein may include various operations that may be embodied in machine executable instructions to be executed by a computer system. A computer system may include one or more general or special purpose computers (or other electronic devices). A computer system may include hardware components that include specific logic components for performing operations; or may include a combination of hardware, software, and / or firmware.

[0117] It should be appreciated that the systems described herein include descriptions of specific embodiments. These embodiments may be combined into a single system, partially combined into other systems, separated into multiple systems, or otherwise divided or combined. In addition, it is contemplated that parameters, attributes, aspects, etc. of another embodiment may be used in one embodiment. For clarity, these parameters, attributes, aspects, etc. are described only in one or more embodiments, and it should be appreciated that these parameters, attributes, aspects, etc. may be combined with or substituted for parameters, attributes, aspects, etc. of another embodiment unless expressly stated herein.

[0118] It is understood that the use of personally identifiable information should be subject to privacy policies and practices that are generally recognized to meet or exceed industry or government requirements for maintaining user privacy. Specifically, personally identifiable information data should be managed and processed to minimize the risk of unintentional or unauthorized access or use, and the nature of the authorized use should be clearly stated to users.

[0119] Although the foregoing has been described in considerable detail for the sake of clarity, it will be apparent that certain changes and modifications may be made without departing from the principles of the present disclosure. It should be noted that there are many alternative ways of implementing both the processes and the apparatus described herein. Therefore, the embodiments of the present disclosure should be regarded as illustrative rather than restrictive, and the specification is not limited to the details given herein, but may be modified within the scope and equivalents of the appended claims.

Claims

1. A method for a network node, the method comprising: Generates channel measurement resource (CMR) configurations to support multiple transmit and receive point (multi-TRP) coherent joint transmit (CJT) channel state information (CSI) reporting; transmitting the CMR configuration to the UE, wherein the CMR configuration associates the multiple TRPs CSI report with a resource set comprising one or more resources, wherein each of the one or more resources comprises a plurality of ports, and wherein the CMR configuration indicates a mapping of the plurality of ports to a plurality of TRPs; transmitting one or more channel state information reference signals (CSI-RS) to the UE; receiving the multi-TRP CJT CSI report from the UE; as well as Transmit and send to the UE based on the multiple TRP CJT CSI reports. The method of claim 1 , wherein the mapping is hard-coded. The method of claim 1 , wherein the mapping is configured by the network node.

4. The method of claim 1, wherein the CMR configuration further includes an antenna configuration for the multiple TRPs, and the UE uses the antenna configuration to determine the mapping.

5. A method according to claim 4, wherein the antenna configuration of each TRP is the same.

6. The method of claim 4, wherein the antenna configuration of at least one TRP is different from that of other TRPs.

7. The method of claim 1, wherein the mapping of the plurality of ports to the plurality of TRPs is determined sequentially.

8. The method of claim 1, wherein the mapping of the plurality of ports to the plurality of TRPs is explicitly configured by the network node.

9. The method of claim 1, wherein ports in the same CDM group are grouped together in association with the same TRP through the mapping.

10. A method for a network node, the method comprising: Generates channel measurement resource (CMR) configurations to support multiple transmit and receive point (multi-TRP) coherent joint transmit (CJT) channel state information (CSI) reporting; transmitting the CMR configuration to a UE, wherein the CMR configuration associates the multiple TRP CSI reports with a resource set comprising a plurality of resources, and wherein the CMR configuration associates each resource of the plurality of resources with a TRP in a plurality of TRPs; transmitting one or more channel state information reference signals (CSI-RS) to the UE; receiving the multi-TRP CJT CSI report from the UE; as well as Transmit and send to the UE based on the multiple TRP CJT CSI reports.

11. The method of claim 10, wherein the CMR configuration individually configures one or more resources to share the same TRP, and wherein the multi-TRP CJT CSI report from the UE independently includes a preferred resource for each TRP.

12. The method of claim 10, wherein the CMR configuration indicates multiple groups of resources and each group contains resources from a different TRP, wherein the multi-TRP CJT CSI report from the UE includes a preferred group.

13. The method of claim 12, wherein within the same group, all resources are configured with the same number of ports. The method of claim 12 , wherein across different groups, all resources are configured with the same number of ports.

15. The method of claim 12, wherein across different groups, resources are configured with different numbers of ports.

16. A method for a network node, the method comprising: Generates channel measurement resource (CMR) configurations to support multiple transmit and receive point (multi-TRP) coherent joint transmit (CJT) channel state information (CSI) reporting; transmitting the CMR configuration to the UE, wherein the CMR configuration maps one or more resource sets to a TRP among a plurality of TRPs; transmitting one or more channel state information reference signals (CSI-RS) to the UE; receiving the multi-TRP CJT CSI report from the UE; as well as Transmit and send to the UE based on the multiple TRP CJT CSI reports.

17. The method of claim 16, wherein each resource set is mapped to a TRP.

18. The method of claim 16, wherein different resource sets are configured with the same number of resources, and each resource is configured with the same number of ports.

19. The method of claim 16, wherein the CMR configuration comprises groups of resource sets, wherein each group comprises CSI-RS resources belonging to a different TRP.

20. The method of claim 16, wherein all CMRs from different TRPs are contained within the same CDRX active time, the same time slot or time domain window, without duplex direction changes in between.

21. A method for a user equipment (UE), the method comprising: receiving a channel measurement resource (CMR) configuration to support a multiple transmit and receive point (multi-TRP) coherent joint transmit (CJT) channel state information (CSI) report, wherein the CMR configuration associates the multi-TRP CJT CSI report with a resource set comprising one or more resources, wherein each of the one or more resources comprises a plurality of ports, and wherein the CMR configuration indicates a mapping of the plurality of ports to a plurality of TRPs; receiving one or more channel state information reference signals (CSI-RS) from the plurality of TRPs; and Report the multi-TRP CJT CSI report to a network node.

22. The method of claim 21, wherein the mapping is hard-coded.

23. The method of claim 21, wherein the mapping is configured by a network node.

24. The method of claim 21, wherein the CMR configuration further comprises an antenna configuration for the multiple TRPs, and the UE uses the antenna configuration to determine the mapping.

25. The method of claim 24, wherein the antenna configuration of each TRP is the same.

26. The method of claim 24, wherein the antenna configuration of at least one TRP is different from that of the other TRPs.

27. The method of claim 21, wherein the mapping of the plurality of ports to the plurality of TRPs is determined sequentially.

28. The method of claim 21, wherein the mapping of the plurality of ports to the plurality of TRPs is explicitly configured by the network node.

29. The method of claim 21, wherein ports in the same CDM group are grouped together in association with the same TRP through the mapping.

30. A method for a user equipment (UE), the method comprising: receiving a channel measurement resource (CMR) configuration to support a multiple transmit and receive point (multi-TRP) coherent joint transmit (CJT) channel state information (CSI) report, wherein the CMR configuration associates the multi-TRP CJT CSI report with a resource set comprising a plurality of resources, and wherein the CMR configuration associates each of the plurality of resources with a TRP in a plurality of TRPs; receiving one or more channel state information reference signals (CSI-RS) from the plurality of TRPs; as well as Report the multi-TRP CJT CSI report to a network node.

31. The method of claim 30, wherein the CMR configuration individually configures one or more resources to share the same TRP, and wherein the multi-TRP CJT CSI report independently includes a preferred resource for each TRP.

32. The method of claim 30, wherein the CMR configuration indicates multiple groups of resources, and each group contains resources from a different TRP, wherein the multi-TRPCJT CSI report includes a preferred group.

33. The method of claim 32, wherein within the same group, all resources are configured with the same number of ports.

34. The method of claim 32, wherein across different groups, all resources are configured with the same number of ports.

35. The method of claim 32, wherein across different groups, resources are configured with different numbers of ports.

36. A method for a network node, the method comprising: receiving a channel measurement resource (CMR) configuration to support multiple transmit and receive point (multi-TRP) coherent joint transmit (CJT) channel state information (CSI) reporting, wherein the CMR configuration maps one or more resource sets to one TRP among the multiple TRPs; receiving one or more channel state information reference signals (CSI-RS) from the plurality of TRPs; and Report the multi-TRP CJT CSI report to a network node.

37. A method according to claim 36, wherein each resource set is mapped to a TRP.

38. The method of claim 36, wherein different resource sets are configured with the same number of resources, and each resource is configured with the same number of ports.

39. The method of claim 36, wherein the CMR configuration comprises groups of resource sets, wherein each group comprises CSI-RS resources belonging to a different TRP.

40. The method of claim 36, wherein all CMRs from different TRPs are contained within the same CDRX activity time, same time slot or time domain window, without duplex direction changes in between.

41. An apparatus comprising means for performing the method according to any one of claims 1 to 40.

42. A computer-readable medium comprising instructions which, when executed by one or more processors of an electronic device, cause the electronic device to perform the method of any one of claims 1 to 40.

43. An apparatus comprising logic components, modules or circuits for performing the method of any one of claims 1 to 40.

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