Coherent joint transmit codebook for local multiple transmit-receive point pattern

Abstract

Aspects of the present disclosure provide techniques for local multi-TRP deployment using coherent joint transmission (CJT) codebooks that minimizes the overhead requirements required to report channel feedback information. To this end, the UE may generate a CSI report based on a CJT codebook indicating a common precoding index for a spatial domain matrix for a physically co-located TRP. In some examples, a UE may provide a precoding matrix based on a combination of parameters such as a spatial domain matrix, a crossing coefficient, and a frequency domain matrix. Each of the precoding matrix parameters may be stacked corresponding to the number of TRP localized in physical co-location in order to minimize the amount of information that the UE may need to report.

Description

Background Art Technical Field

[0001] The present disclosure generally relates to communication systems, and more specifically to a coherent joint transmission (CJT) codebook for a localized multiple transmit receive point (multi-TRP) mode.

[0002] introduction

[0003] Wireless communication systems are widely deployed to provide a variety of telecommunication services, such as telephony, video, data, messaging, and broadcast. Typical wireless communication systems may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.

[0004] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate at a city, country, region, and even global level. An example telecommunication standard is 5G New Radio (NR). 5G NR is part of the continuous mobile broadband evolution promulgated by the Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with the Internet of Things (IoT)) and other requirements. 5GNR includes services associated with enhanced mobile broadband (eMBB), massive machine type communication (mMTC), and ultra-reliable low latency communication (URLLC). Certain aspects of 5G NR may be based on 4G Long Term Evolution (LTE) standards. It is necessary to further improve 5G NR technology. In addition, these improvements may also be applicable to other multiple access technologies and telecommunication standards that employ these technologies. Summary of the invention

[0005] The following presents a simplified summary of one or more aspects in order to provide a basic understanding of these aspects. This summary is not an extensive overview of all contemplated aspects, and is neither intended to identify key or important elements of all aspects, nor to describe the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to a more detailed description presented later.

[0006] In one aspect of the present disclosure, a method, a non-transitory computer-readable medium, and an apparatus are provided. The method may include receiving a channel state information reference signal (CSI-RS) at a user equipment (UE) from a set of transmit receive points (TRPs) associated with a network entity, wherein at least a subset of TRPs from the set of TRPs are physically co-located. The method may also include generating a channel state information (CSI) report based on a coherent joint transmission (CJT) codebook, the coherent joint transmission (CJT) codebook indicating a common precoding index for a spatial domain matrix for the subset of TRPs that are physically co-located. The method may also include sending the CSI report to the network entity.

[0007] In one aspect, the present disclosure provides an apparatus for wireless communication. The apparatus may include: a memory storing computer-executable instructions; and a processor communicatively coupled to the memory and configured to execute instructions. The processor may be configured to receive a CSI-RS from a TRP set associated with a network entity at a UE, wherein at least a subset of TRPs from the TRP set are physically co-located. The processor may also be configured to generate a CSI report based on a CJT codebook indicating a common precoding index for a spatial domain matrix for the physically co-located subset of TRPs. The processor may also be configured to send the CSI report to the network entity.

[0008] In another aspect, the present disclosure provides an apparatus for wireless communication. The apparatus may include a component for receiving a CSI-RS at a UE from a TRP set associated with a network entity, wherein at least a subset of TRPs from the TRP set are physically co-located. The apparatus may include a component for generating a CSI report based on a CJT codebook, the CJT codebook indicating a common precoding index for a spatial domain matrix for the physically co-located subset of TRPs. The apparatus may include a component for sending the CSI report to the network entity.

[0009] In another aspect, the present disclosure provides a non-transitory computer-readable medium storing computer executable code. The non-transitory computer-readable medium may include code for receiving a CSI-RS at a UE from a TRP set associated with a network entity, wherein at least a subset of TRPs from the TRP set are physically co-located. The non-transitory computer-readable medium may also include code for generating a CSI report based on a CJT codebook, the CJT codebook indicating a common precoding index for a spatial domain matrix for the physically co-located subset of TRPs. The non-transitory computer-readable medium may also include code for sending the CSI report to the network entity.

[0010] To achieve the foregoing and related ends, one or more aspects include the features fully described below and particularly pointed out in the claims. The following description and the accompanying drawings set forth in detail some illustrative features of one or more aspects. However, these features are merely indicative of some of the various ways in which the principles of the various aspects may be employed, and this specification is intended to include all such aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a diagram illustrating an example of a wireless communication system and an access network.

[0012] Figure 2A is a diagram illustrating an example of the first frame.

[0013] Figure 2B is a diagram illustrating an example of a DL channel within a subframe.

[0014] Figure 2C is a diagram illustrating an example of the second frame.

[0015] Figure 2D is a diagram illustrating an example of a UL channel within a subframe.

[0016] Figure 3 is a diagram illustrating an example of a base station and a user equipment (UE) in an access network.

[0017] Figure 4 is an example of a call flow diagram between a network entity and a UE for CSI-RS based downlink adaptation according to aspects of the present disclosure.

[0018] Figure 5 is a schematic diagram illustrating an example configuration for deriving a precoding matrix according to aspects of the present disclosure.

[0019] Figure 6 is an example of a distributed multi-TRP scenario including multi-TRP cells for a UE according to various aspects of the present disclosure.

[0020] Figure 7 is an example of a local multi-TRP deployment of multiple TRPs that are physically co-located according to various aspects of the present disclosure.

[0021] Figure 8 is a schematic diagram of an example deployment of multiple TRPs according to various aspects of the present disclosure, where a TRP set can be subdivided into multiple TRP groups.

[0022] Fig. 9 is another illustration of a local TRP deployment with multiple TRPs subdivided into TRP groups according to various aspects of the present disclosure.

[0023] Fig.10 is a flow chart of an example method of wireless communication in accordance with aspects of the present disclosure.

[0024] Fig.11 yes Figure 1 A schematic diagram of example components of a UE. DETAILED DESCRIPTION

[0025] The detailed description set forth below in conjunction with the accompanying drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. In order to provide a thorough understanding of the various concepts, the specific embodiments include specific details. However, it is apparent to those skilled in the art that these concepts may be practiced without these specific details. In some cases, well-known structures and components are shown in block diagram form to avoid obscuring such concepts. Although the following description may focus on 5G NR, the concepts described herein may be applicable to other similar fields, such as LTE, LTE-A, CDMA, GSM, and other wireless technologies.

[0026] To meet the growing demand for extended mobile broadband connections, wireless communication technologies are being adapted to support communications with multiple users that share available system resources. One such development focuses on multi-TRP technology to improve link reliability and throughput. A network may include multiple TRPs deployed at various geographical locations (e.g., on different buildings). A TRP may be communicatively coupled to multiple or a single network entity. A TRP may also be associated with one or more cells. For multi-TRP transmissions, the network may form a TRP cluster to serve the UE. For example, one or more network entities may coordinate with each other to schedule TRP clusters to serve downlink transmissions to the UE. However, radio conditions, spectrum utilization and / or dynamic behavior of traffic load, and / or UE mobility may present various challenges to multi-TRP-based communications.

[0027] For example, a distributed TRP deployment where different TRPs are positioned in a geometrically distributed manner (e.g., a first TRP located on one building and a second TRP located on another building) requires a large amount of feedback overhead. The feedback overhead increases proportionally with the number of deployed TRPs (N) because each TRP may be spatially far away from other TRPs and have a different delay profile for the beam. Therefore, providing channel state information (CSI) for multiple TRPs deployed in a distributed manner may require the UE to provide a large amount of information. And if the multiple TRPs are not calibrated with respect to the carrier frequency or sampling clock timing, coherent transmission between TRPs may not be feasible because inter-carrier interference (ICI) may be introduced.

[0028] Various aspects of the present disclosure provide techniques for localized multi-TRP deployment utilizing a coherent joint transmission (CJT) codebook that minimizes the overhead requirements needed to report channel feedback information. To this end, the UE may generate a CSI report based on a CJT codebook that indicates a common precoding index for a spatial domain matrix for physically co-located TRPs. In some examples, the UE may provide a precoding matrix based on a combination of parameters such as a spatial domain matrix, a spanning coefficient, and a frequency domain matrix. Each of the precoding matrix parameters may be stacked corresponding to the number of TRPs localized in the physical co-location so as to minimize the amount of information that the UE may need to report.

[0029] Several aspects of telecommunication systems will now be described with reference to various apparatus and methods. These apparatus and methods will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether these elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0030] As an example, an element, or any part of an element, or any combination of elements can be implemented as a "processing system", which includes one or more processors. Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, systems on chip (SoCs), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gating logic, discrete hardware circuits, and other suitable hardware configured to perform various functionalities described throughout the present disclosure. One or more processors in a processing system can execute software. Whether it is referred to as software, firmware, middleware, microcode, hardware description language, or other names, software should be widely interpreted as meaning instructions, instruction sets, codes, code segments, program codes, programs, subroutines, software components, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc.

[0031] Therefore, in one or more example embodiments, the described functions can be implemented with hardware, software or any combination thereof. If implemented in software, the function can be stored or encoded on a computer-readable medium as one or more instructions or codes. Computer-readable media include computer storage media. Storage media can be any available medium that can be accessed by a computer. By way of example and not limitation, such computer-readable media can include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), optical disk storage device, magnetic disk storage device, other magnetic storage devices, a combination of computer-readable media of the above type, or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.

[0032] Figure 1 1 is a diagram illustrating an example of a wireless communication system and access network 100 in which restrictions on blind decoding of search space are implemented. The wireless communication system (also referred to as a wireless wide area network (WWAN)) includes a base station 102, a UE 104, an evolved packet core (EPC) 160, and another core network (e.g., a 5G core (5GC) 190). The base station 102 may include a macro cell (a high-power cellular base station) and / or a small cell (a low-power cellular base station). A macro cell includes a base station. A small cell includes a femto cell, a pico cell, and a micro cell.

[0033] In an aspect, one or more of the UEs 104 may include a localized multi-TRP CSI reporting component 140 for receiving a channel state information reference signal (CSI-RS) from a set of transmit receive points (TRPs) associated with a network entity at a user equipment (UE), wherein at least a subset of TRPs from the set of TRPs may be physically co-located. Based on the received CSI-RS, the localized multi-TRP CSI reporting component 140 may generate a CSI report. The UE 104 (and more specifically, the localized multi-TRP CSI reporting component 140) may generate a CSI report based on a CJT codebook 142 in response to the CSI-RS, the CJT codebook indicating a common precoding index for a spatial domain matrix for a subset of TRPs that are physically co-located. In some examples, the localized multi-TRP CSI reporting component 140 may utilize a CSI report generation component 143 to generate a CSI report. Local multi-TRP CSI reporting component 140 and / or sending component may then send the CSI report to a network entity.

[0034] The base station 102 configured for 4G LTE (collectively referred to as the Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) can interface with the EPC 160 via a backhaul link 132 (e.g., an S1 interface). The base station 102 configured for 5G NR (collectively referred to as the Next Generation RAN (NG-RAN)) can interface with the core network 190 via a backhaul link 184. Among other functions, the base station 102 can perform one or more of the following functions: delivery of user data, radio channel encryption and decryption, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection establishment and release, load balancing, distribution of non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS), subscriber and equipment tracking, RAN information management (RIM), paging, positioning, and delivery of warning messages. Base stations 102 may communicate with each other directly or indirectly (eg, through EPC 160 or core network 190) via backhaul links 134 (eg, X2 interfaces). Backhaul links 134 may be wired or wireless.

[0035] Base station 102 can communicate wirelessly with UE 104. Each of base stations 102 can provide communication coverage for a corresponding geographic coverage area 110. There may be overlapping geographic coverage areas 110. For example, a small cell 102' may have a coverage area 110' that overlaps with the coverage area 110 of one or more macro base stations 102. A network including both small cells and macro cells may be referred to as a heterogeneous network. A heterogeneous network may also include a home evolved Node B (eNB) (HeNB), which may provide services to a restricted group referred to as a closed subscriber group (CSG). A communication link 120 between base station 102 and UE 104 may include an uplink (UL) (also referred to as a reverse link) transmission from UE 104 to base station 102 and / or a downlink (DL) (also referred to as a forward link) transmission from base station 102 to UE 104. The communication link 120 may use multiple input multiple output (MIMO) antenna technology, including spatial multiplexing, beamforming and / or transmit diversity. The communication link may be through one or more carriers. For each carrier allocated in the carrier aggregation for a total of up to Yx MHz (x component carriers) for transmission in each direction, the base station 102 / UE 104 may use spectrum of up to Y MHz (e.g., 5 MHz, 10 MHz, 15 MHz, 20 MHz, 100 MHz, 400 MHz, etc.) bandwidth. These carriers may or may not be adjacent to each other. The allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated for DL ​​compared to UL). The component carrier may include a primary component carrier and one or more secondary component carriers. The primary component carrier may be referred to as a primary cell (PCell) and the secondary component carrier may be referred to as a secondary cell (SCell).

[0036] Some UEs 104 may communicate with each other using a device-to-device (D2D) communication link 158. The D2D communication link 158 may use DL / UL WWAN spectrum. The D2D communication link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), and a physical sidelink control channel (PSCCH). The D2D communication may be through various wireless D2D communication systems, such as, for example, FlashLinQ, WiMedia, Bluetooth, ZigBee, Wi-Fi based on IEEE 802.11 standards, LTE, or NR.

[0037] The wireless communication system may also include a Wi-Fi access point (AP) 150 that communicates with a Wi-Fi station (STA) 152 via a communication link 154 in the 5 GHz unlicensed spectrum. When communicating in the unlicensed spectrum, the STA 152 / AP 150 may perform a clear channel assessment (CCA) to determine whether the channel is available before communicating.

[0038] The small cell 102' may operate in licensed and / or unlicensed spectrum. When operating in the unlicensed spectrum, the small cell 102' may employ NR and use the same 5 GHz unlicensed spectrum as the 5 GHz unlicensed spectrum used by the Wi-Fi AP 150. The small cell 102' employing NR in the unlicensed spectrum may improve the coverage of the access network and / or increase the capacity of the access network.

[0039] The electromagnetic spectrum is typically subdivided into various categories, bands, channels, etc. based on frequency / wavelength. In 5GNR, two initial operating bands have been identified as frequency range designations FR1 (410MHz-7.125GHz) and FR2 (24.25GHz-52.6GHz). Frequencies between FR1 and FR2 are often referred to as mid-band frequencies. Although a portion of FR1 is greater than 6GHz, FR1 is often (interchangeably) referred to as the "sub-6GHz" band in various documents and articles. FR2 sometimes presents a similar naming issue, although it is different from the extremely high frequency (EHF) band (30GHz to 300GHz) identified as the "millimeter wave" (mmW) band by the International Telecommunication Union (ITU), but it is often (interchangeably) referred to as the "millimeter wave" band in various documents and articles.

[0040] In view of the above aspects, unless otherwise specifically stated, it should be understood that if used herein, the term "below 6 GHz" or the like may broadly represent frequencies that may be less than 6 GHz, may be within FR1, or may include mid-band frequencies. In addition, unless otherwise specifically stated, it should be understood that if the term "millimeter wave" or the like is used herein, it may broadly represent frequencies that may include mid-band frequencies, may be within FR2, or may be within the EHF band. Communications using mmW radio bands have extremely high path loss and short range. The mmW base station 180 may utilize beamforming 182 with the UE 104 to compensate for such path loss and short range.

[0041] Base station 180 may transmit beamformed signals in one or more transmit directions 182' to UE 104. UE 104 may receive beamformed signals from base station 180 in one or more receive directions 182". UE 104 may also transmit beamformed signals to base station 180 in one or more transmit directions. Base station 180 may receive beamformed signals from UE 104 in one or more receive directions. Base station 180 / UE 104 may perform beam training to determine the best receive direction and transmit direction for each of base station 180 / UE 104. The transmit direction and receive direction of base station 180 may be the same or may be different. The transmit direction and receive direction of UE 104 may be the same or may be different.

[0042] The EPC 160 may include a mobility management entity (MME) 162, other MMEs 164, a serving gateway 166, a multimedia broadcast multicast service (MBMS) gateway 168, a broadcast multicast service center (BM-SC) 170, and a packet data network (PDN) gateway 172. The MME 162 may communicate with a home subscriber server (HSS) 174. The MME 162 is a control node that handles signaling between the UE 104 and the EPC 160. In general, the MME 162 provides bearer and connection management. All user Internet Protocol (IP) packets are passed through the serving gateway 166, which itself is connected to the PDN gateway 172. The PDN gateway 172 provides UE IP address allocation and other functions. The PDN gateway 172 and the BM-SC 170 are connected to IP services 176. The IP services 176 may include the Internet, an intranet, an IP multimedia subsystem (IMS), PS streaming services, and / or other IP services. The BM-SC 170 may provide functionality for MBMS user service provisioning and delivery. The BM-SC 170 may serve as an entry point for content provider MBMS delivery, may be used to authorize and initiate MBMS bearer services in a public land mobile network (PLMN), and may be used to schedule MBMS delivery. The MBMS gateway 168 may be used to distribute MBMS services to base stations 102 belonging to a multicast broadcast single frequency network (MBSFN) area that broadcasts a specific service, and may be responsible for session management (start / stop) and for collecting eMBMS-related billing information.

[0043] The core network 190 may include an access and mobility management function (AMF) 192, other AMFs 193, a session management function (SMF) 194, and a user plane function (UPF) 195. The AMF 192 may communicate with a unified data management (UDM) 196. The AMF 192 is a control node that handles signaling between the UE 104 and the core network 190. Generally speaking, the AMF 192 provides QoS flow and session management. All user Internet Protocol (IP) packets are passed through the UPF 195. The UPF 195 provides UE IP address allocation and other functions. The UPF 195 is connected to an IP service 197. The IP service 197 may include the Internet, an intranet, an IP multimedia subsystem (IMS), a PS streaming service, and / or other IP services.

[0044] A base station may also be referred to as a gNB, a Node B, an evolved Node B (eNB), an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), a transmit receive point (TRP), or some other suitable term. Base station 102 provides an access point to EPC 160 or core network 190 for UE 104. Examples of UE 104 include a cellular phone, a smart phone, a Session Initiation Protocol (SIP) phone, a laptop, a personal digital assistant (PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., an MP3 player), a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor / actuator, a display, or any other similarly functional device. Some of UE 104 may be referred to as IoT devices (e.g., a parking meter, a gas pump, a toaster, a vehicle, a heart monitor, etc.). UE 104 may also be referred to as a station, a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.

[0045] FIG. 2A to FIG. 2D This is an example that can be Figure 1 104 and base station 102 for use in communications between the UE 104 and the base station 102. Figure 2A 200 is a diagram illustrating an example of a first subframe within a 5G / NR frame structure. Figure 2B FIG230 is a diagram illustrating an example of DL channels within a 5G / NR subframe. Figure 2C 250 is a diagram illustrating an example of a second subframe within a 5G / NR frame structure. Figure 2DFIG280 is a diagram illustrating an example of an UL channel within a 5G / NR subframe. The 5G / NR frame structure may be FDD, where for a particular set of subcarriers (carrier system bandwidth), subframes within that subcarrier set are dedicated to either DL or UL, or the 5G / NR frame structure may be TDD, where for a particular set of subcarriers (carrier system bandwidth), subframes within that subcarrier set are dedicated to both DL and UL. Figure 2A , Figure 2C In the example provided, it is assumed that the 5G / NR frame structure is TDD, where subframe 4 is configured with slot format 28 (mainly DL), where D is DL, U is UL, and X is used flexibly between DL / UL, and subframe 3 is configured with slot format 34 (mostly UL). Although subframes 3 and 4 are shown as having slot formats 34 and 28, respectively, any particular subframe may be configured with any of the various available slot formats 0-61. Slot formats 0 and 1 are full DL and full UL, respectively. Other slot formats 2-61 include a mix of DL, UL and flexible symbols. The UE is configured with the slot format through the received slot format indicator (SFI) (dynamically configured through DL control information (DCI) or semi-statically / statically configured through radio resource control (RRC) signaling). Note that the following description also applies to the 5G / NR frame structure for TDD.

[0046] Other wireless communication technologies may have different frame structures and / or different channels. A frame (10ms) may be divided into 10 equally sized subframes (1ms). Each subframe may include one or more time slots. A subframe may also include a microslot, which may include 7, 4, or 2 symbols. Each time slot may include 7 or 14 symbols, depending on the time slot configuration. For time slot configuration 0, each time slot may include 14 symbols, and for time slot configuration 1, each time slot may include 7 symbols. The symbol on the DL may be a cyclic prefix (CP) OFDM (CP-OFDM) symbol. The symbol on the UL may be a CP-OFDM symbol (for high throughput scenarios) or a discrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) symbol (also known as a single carrier frequency division multiple access (SC-FDMA) symbol) (for power-limited scenarios; limited to single-stream transmission). The number of time slots in a subframe is based on the time slot configuration and parameter set (numerology). For slot configuration 0, different parameter sets μ0 to 5 allow 1, 2, 4, 8, 16, and 32 slots per subframe, respectively. For slot configuration 1, different parameter sets 0 to 2 allow 2, 4, and 8 slots per subframe, respectively. Accordingly, for slot configuration 0 and parameter set μ, there are 14 symbols per slot and 2 per subframe. μ time slots. The subcarrier spacing and symbol length / duration are functions of the parameter set. The subcarrier spacing can be equal to 2μ *15kHz, where μ is parameter set 0 to 5. Therefore, the subcarrier spacing for parameter set μ=0 is 15kHz, and the subcarrier spacing for parameter set μ=5 is 480kHz. The symbol length / duration is inversely related to the subcarrier spacing. FIG. 2A to FIG. 2D An example is provided for slot configuration 0 with 14 symbols per slot and parameter set μ=0 with 1 slot per subframe. The subcarrier spacing is 15 kHz and the symbol duration is about 66.7 μs.

[0047] A resource grid may be used to represent the frame structure. Each slot includes a resource block (RB) (also referred to as a physical RB (PRB)) extending over 12 consecutive subcarriers. The resource grid is divided into a number of resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0048] like Figure 2A As illustrated, some of the REs carry reference (pilot) signals (RS) for the UE. The RS may include a demodulation RS (DM-RS) for channel estimation at the UE (indicated as R for a particular configuration). x , where 100x is the port number, but other DM-RS configurations are possible) and a channel state information reference signal (CSI-RS). RS may also include beam measurement RS (BRS), beam refinement RS (BRRS) and phase tracking RS (PT-RS).

[0049] Figure 2B Examples of various DL channels within a subframe of a frame are illustrated. The physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs), each CCE including nine RE groups (REGs), each REG including four consecutive REs in an OFDM symbol. The primary synchronization signal (PSS) may be within symbol 2 of a specific subframe of the frame. The PSS is used by UE 104 to determine the subframe / symbol timing and the physical layer identity. The secondary synchronization signal (SSS) may be within symbol 4 of a specific subframe of the frame. The SSS is used by the UE to determine the physical layer cell identity group number and the radio frame timing. Based on the physical layer identity and the physical layer cell identity group number, the UE can determine the physical cell identifier (PCI). Based on the PCI, the UE can determine the location of the aforementioned DM-RS. The physical broadcast channel (PBCH) carrying the master information block (MIB) can be logically grouped with the PSS and SSS to form a synchronization signal (SS) / PBCH block. The MIB provides the system frame number (SFN) and the number of RBs in the system bandwidth. The Physical Downlink Shared Channel (PDSCH) carries user data, broadcast system information not sent through the PBCH (such as System Information Blocks (SIBs)), and paging messages.

[0050] like Figure 2CAs illustrated in , some of the REs carry DM-RSs for channel estimation at the base station (indicated as R for one particular configuration, but other DM-RS configurations are possible). The UE may send a DM-RS for a physical uplink control channel (PUCCH) and a DM-RS for a physical uplink shared channel (PUSCH). The PUSCH DM-RS may be sent in the first or first two symbols of the PUSCH. The PUCCH DM-RS may be sent in different configurations depending on whether a short PUCCH or a long PUCCH is sent and on the specific PUCCH format used. Although not shown, the UE may send a sounding reference signal (SRS). The SRS may be used by the base station for channel quality estimation to enable frequency-dependent scheduling of the UL.

[0051] Figure 2D Examples of various UL channels within a subframe of a frame are illustrated. The PUCCH may be located at a position as indicated in one configuration. The PUCCH carries uplink control information (UCI), such as scheduling requests, channel quality indicator (CQI), precoding matrix indicator (PMI), rank indicator (RI), and HARQ ACK / NACK feedback. The PUSCH carries data and may additionally be used to carry a buffer status report (BSR), a power headroom report (PHR), and / or UCI.

[0052] Figure 33 is a diagram of base station 310 communicating with UE 350. In the DL, IP packets from EPC 160 may be provided to controller / processor 375. Controller / processor 375 implements layer 3 and layer 2 functionality. Layer 3 includes a radio resource control (RRC) layer, and layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer. The controller / processor 375 provides RRC layer functionality associated with broadcasting of system information (e.g., MIB, SIB), RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release), inter-radio access technology (RAT) mobility, and measurement configuration for UE measurement reporting; PDCP layer functionality associated with header compression / decompression, security (encryption, decryption, integrity protection, integrity verification), and handover support functions; RLC layer functionality associated with delivery of upper layer packet data units (PDUs), error correction through ARQ, concatenation, segmentation, and reassembly of RLC service data units (SDUs), re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs), demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

[0053] The transmit (TX) processor 316 and receive (RX) processor 370 implement layer 1 functionality associated with various signal processing functions. Layer 1 (which includes the physical (PHY) layer) may include error detection on the transport channel, forward error correction (FEC) coding / decoding of the transport channel, interleaving, rate matching, mapping to the physical channel, modulation / demodulation of the physical channel, and MIMO antenna processing. The TX processor 316 handles the mapping to the signal constellation based on various modulation schemes (e.g., binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), M-order phase shift keying (M-PSK), M-order quadrature amplitude modulation (M-QAM)). The decoded and modulated symbols can then be divided into parallel streams. Each stream can then be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and / or frequency domain, and then combined using an inverse fast Fourier transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream. The OFDM stream is spatially precoded to generate multiple spatial streams. Channel estimates from a channel estimator 374 may be used to determine coding and modulation schemes, as well as for spatial processing. Channel estimates may be derived from reference signals and / or channel state feedback sent by the UE 350. Each spatial stream may then be provided to a different antenna 320 via a separate transmitter 318TX. Each transmitter 318TX may modulate an RF carrier with a corresponding spatial stream for transmission.

[0054] At the UE 350, each receiver 354RX receives a signal through its corresponding antenna 352. Each receiver 354RX recovers the information modulated onto the RF carrier and provides the information to a receive (RX) processor 356. The TX processor 368 and the RX processor 356 implement layer 1 functionality associated with various signal processing functions. The RX processor 356 can perform spatial processing on the information to recover any spatial stream destined for the UE 350. If multiple spatial streams are destined for the UE 350, they can be combined into a single OFDM symbol stream by the RX processor 356. The RX processor 356 then converts the OFDM symbol stream from the time domain to the frequency domain using a fast Fourier transform (FFT). The frequency domain signal includes a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols on each subcarrier and the reference signal are recovered and demodulated by determining the most likely signal constellation point sent by the base station 310. These soft decisions can be based on channel estimates calculated by the channel estimator 358. The soft decisions are then decoded and deinterleaved to recover the data and control signals originally sent on the physical channel by base station 310. The data and control signals are then provided to controller / processor 359, which implements layer 3 and layer 2 functionality.

[0055] The controller / processor 359 may be associated with a memory 360 that stores program codes and data. The memory 360 may be referred to as a computer readable medium. In the UL, the controller / processor 359 provides demultiplexing between transport and logical channels, packet reassembly, decryption, header decompression, and control signal processing to recover IP packets from the EPC 160. The controller / processor 359 is also responsible for error detection using an ACK and / or NACK protocol to support HARQ operations.

[0056] Similar to the functionality described in conjunction with DL transmissions performed by the base station 310, the controller / processor 359 provides RRC layer functionality associated with system information (e.g., MIB, SIB) acquisition, RRC connection, and measurement reporting; PDCP layer functionality associated with header compression / decompression and security (encryption, decryption, integrity protection, integrity verification); RLC layer functionality associated with delivery of upper layer PDUs, error correction through ARQ, concatenation, segmentation and reassembly of RLC SDUs, resegmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

[0057] Channel estimates derived by the channel estimator 358 based on a reference signal or feedback sent by the base station 310 may be used by the TX processor 368 to select the appropriate coding and modulation schemes and to facilitate spatial processing. The spatial streams generated by the TX processor 368 may be provided to different antennas 352 via separate transmitters 354TX. Each transmitter 354TX may modulate an RF carrier with a corresponding spatial stream for transmission.

[0058] UL transmissions are processed at the base station 310 in a manner similar to that described in conjunction with the receiver functionality at the UE 350. Each receiver 318RX receives a signal through its respective antenna 320. Each receiver 318RX recovers information modulated onto an RF carrier and provides the information to a RX processor 370.

[0059] The controller / processor 375 may be associated with a memory 376 that stores program codes and data. The memory 376 may be referred to as a computer readable medium. In the UL, the controller / processor 375 provides demultiplexing between transport channels and logical channels, packet reassembly, decryption, header decompression, control signal processing to recover IP packets from the UE 350. The IP packets from the controller / processor 375 may be provided to the EPC 160. The controller / processor 375 is also responsible for error detection using ACK and / or NACK protocols to support HARQ operations.

[0060] At least one of the TX processor 368, the RX processor 356, and the controller / processor 359 may be configured to perform operations related to Figure 1 The local multi-TRP CSI reporting component 140 combines various aspects.

[0061] Figure 4 4 is an example of a call flow diagram 400 between a gNB (102 / 180) and a UE 104 for CSI-RS based downlink adaptation to improve signal reliability and throughput. In some examples, each cell may include one or more TRPs, each TRP transmitting on a different beam. To this end, a network entity (e.g., gNB 102 / 180) may send CSI-RS 405 to the UE. In response, the UE 104 may perform downlink channel estimation, where M r ×M t The downlink channel matrix H can be based on M based on the following equation t Port CSI is used to estimate:

[0062]

[0063] The CSI feedback may include several parameters, such as rank indicator (RI), precoding matrix indicator (PMI), and channel quality indicator (CQI). The downlink channel matrix H may be a function of the RI and the precoding matrix index and may be included in the CQI calculation. The UE 104 may measure the CSI feedback using a channel state information reference signal (CSI-RS). Upon receiving the CSI parameters, the gNB may schedule downlink data transmissions accordingly (such as modulation scheme, code rate, number of transmission layers, and MIMO precoding).

[0064] Figure 5 5 is a diagram illustrating an example configuration for deriving a precoding matrix (W). The precoding matrix for CSI reporting may be calculated based on the following equation for a single TRP:

[0065]

[0066] As illustrated in diagram 500, the pre-coding matrix (W) may be a spatial domain (SD) basis (W1), a span coefficient and frequency domain (FD) basis matrix And in the case of deploying multiple distributed TRPs, the pre-coding matrix (W) can be obtained by stacking the SD basis (W1) for each TRP in the multiple TRPs, spanning the coefficients and FD basis matrix to calculate.

[0067] Specifically, the codebook for CJT for multiple TRPs may support two modes. In the first mode (Mode 1), the SD / FD basis selection per TRP / TRP group may allow independent FD basis selection across the N number of TRPs / TRP groups. An example formula (N = number of TRPs or TRP groups) may be derived as follows:

[0068]

[0069] In the second mode (Mode 2), SD basis selection and common / joint (across N TRPs) FD basis selection can be implemented. An example formula for the second mode may be:

[0070]

[0071] The CJT codebook mode discussed above assumes that for each TRP in TRP, a separate spatial basis (e.g., W 1,1 ,...W 1,N ), individual coefficients and individual (or common) frequency bases It can be selected by the UE for CSI feedback. However, reporting each of the separate SD basis, coefficient basis and FD basis increases the overhead. This is because the above configuration is applicable to distributed TRP scenarios where different TRPs are located in a geometrically distributed manner. Figure 6 6 is an example of a distributed multi-TRP scenario 600 including multiple TRP cells for UE 104. In this case, the first TRP 605 can be physically located at a location (e.g., a different building) separate from the second TRP 610. Similarly, the third TRP 615 and the fourth TRP 620 are both located at different physical locations from each TRP. In this case, for a UE with a separate spatial basis (e.g., W 1,1 ,...W 1,N ), individual coefficients and individual (or common) frequency bases Providing CSI feedback to each of the distributed TRPs adds overhead proportional to the number of TRPs (N). And even in the case of a common frequency base, the number of basis vectors can be increased to cover the different delays of different TRPs.

[0072] If multiple TRPs are not calibrated with respect to the carrier frequency or sampling clock timing, coherent transmission between TRPs may not be feasible because ICI may be introduced, which limits the benefits of CJT. Therefore, CJT in distributed TRP scenarios may be challenging because the TRPs will need to have strict calibration between different TRPs. But even with strict calibration between multiple distributed TRPs, UE mobility can provide different Doppler shifts for different TRPs, which may cause frequency offsets between TRPs.

[0073] Figure 7 is an example of a local multi-TRP deployment 700, which may include a first TRP 705, a second TRP 710, a third TRP 715, and a fourth TRP 720 that may be co-located in the same physical location (e.g., all four TRPs are located on the roof of the same building). Although four TRPs are illustrated, it should be understood by those of ordinary skill in the art that as long as there are multiple TRPs in the same location, the number of TRPs in the same co-location may be less or more. In some examples, multiple TRPs may be connected to a single baseband (BB) unit 725. In other examples, different TRPs may be connected to different BB units, which may include a first TRP cluster connected to a first BB unit and a second TRP cluster connected to a second BB unit. In other examples, each TRP may be connected to a different BB unit. However, in the case where multiple TRPs are co-located and connected to a single BB unit 725, system performance may be improved because a single BB unit may be able to strictly calibrate multiple TRPs.

[0074] According to aspects of the present disclosure, CJT may also provide benefits for localized multiple TRPs, since using multiple TRPs (panels) with the same boresight direction instead of fitting all antenna elements into a single calibrated panel may reduce implementation complexity. And multi-panel arrays may be more suitable for massive MIMO gNBs. CJT between localized TRPs may also provide more practical benefits than the distributed case, since co-location of TRPs provides strict calibration between different TRPs (or panels) in the localized case. Additionally, the same Doppler shift for different TRPs may be achieved on the UE side.

[0075] Therefore, the technology disclosed herein allows the UE to be configured with a specific eType-IICJT codebook mode designed to support multi-TRP (panel) scenarios. When the UE is configured with an eType-IICJT codebook for local multi-TRP, one or more of the following codebook structures can be used to derive and report the PMI.

[0076] In a first example of a codebook structure, a common or same spatial basis for multiple TRPs may be selected for each TRP as follows (W1 is a common value for each row representing different TRPs):

[0077]

[0078] Since the distance between co-located TRPs (panels) is negligible compared to the distance between the network entity and the UE, the spatial direction per panel for a single UE may not be significantly different. Therefore, the UE may report a common (or identical) precoding index for the spatial domain matrix (W1) for a subset of physically co-located TRPs. And may also report in the first codebook structure the common frequency base (W2) for different TRPs. f ) information.

[0079] In one example of the first codebook structure, the coefficients The phase and amplitude of can be different for each TRP reported, as shown in Equation 5.0 above. But even with different coefficient bases for different TRPs, such a structure still provides efficiency over the distributed TRP scenario because in such a localized scenario, a smaller number of frequency basis vectors may be required than in the distributed TRP scenario because the delay profiles for different TRPs at the same location will be similar to each other.

[0080] In the second codebook structure example, for the spatial domain matrix (e.g., W1), the coefficient and frequency base A common precoding index may be selected by the UE for all three parameters for each TRP in different TRPs as follows:

[0081]

[0082] In this case, the spatial direction per TRP and the propagation delay per panel for a single UE may not be so different for each TRP in the co-located TRPs. Therefore, the sample space and frequency base and the same coefficients for different TRPs can be selected.

[0083] However, in order to allow for flexible inter-TRP distances, the phase offset between different TRPs (panels) can be included by introducing common phase values ​​for different TRPs. Therefore, in this case, the precoding index for W1 can be common for all TRPs reported by the UE to the network entity. Additionally, the common frequency base (W1) for different TRPs can be used to calculate the phase offset between different TRPs. f ) and coefficients It can also be reported to the network entity as part of the CSI report. However, in order to take into account the phase offset, additional co-phase values ​​between different TRPs can be reported. Therefore, as shown above, the co-phase value It may be within a given alphabet (eg, QPSK or 8PSK) that is included as part of Equation 6.0.

[0084] In another codebook structure example, the common spatial basis (W1), frequency basis (W f ) and coefficients Can be selected and reported by the UE for multiple TRPs. However, additionally or alternatively, the third codebook structure may also include different co-phase values ​​for different polarities (POL) to account for different antennas within each TRP:

[0085]

[0086] Therefore, in this case, the precoding index for W1 may be common to all physically co-located TRPs reported by the UE to the network entity. Additionally, the common frequency base (W1) for different co-located TRPs may be common to all physically co-located TRPs reported by the UE to the network entity. f ) and coefficients It may also be reported to the network entity as part of the CSI report. However, in such an example, the per-POL common phase values ​​between different TRPs may be reported ( and ), these per-POL co-phase values ​​are given an alphabet (e.g., QPSK or 8PSK).

[0087] Figure 8 800 is a diagram of an example deployment of multiple TRPs, wherein a set of TRPs may be subdivided into multiple TRP groups, and each TRP group from the multiple TRP groups may include one or more TRPs that are physically co-located. For example, a first TRP and a second TRP may be included as part of a first TRP group 805, while a third TRP may be included as part of a second TRP group 810, and a fourth TRP may be included in a third TRP group 815. Thus, in such a scenario, a TRP may be deployed with two co-located TRPs and two single TRPs that may be part of separate groups.

[0088] Fig. 9 900 is another diagram of a configuration of multiple TRPs that are grouped together. In such a scenario, a first TRP and a second TRP may be grouped as part of a first TRP group, while a third TRP and a fourth TRP may be grouped as part of a second TRP group. Thus, one of ordinary skill will appreciate that multiple TRPs may be grouped in any number of configurations, including where all TRPs are part of the same group because they are co-located, or where a subset of TRPs (e.g., three TRPs that are co-located) but one TRP are not physically co-located and are therefore configured as independent groups.

[0089] But in Figure 8 and Fig. 9In each instance of subdividing multiple TRPs into multiple groups as shown in , the UE may be configured with information about TRP (or CSI-RS resource) grouping, where each TRP group (or CSI-RS resource group) may be composed of co-located TRPs (CSI-RS resources).

[0090] Therefore, if the UE is configured with TRP (CSI-RS resource) grouping information, the corresponding CJT codebook structure can be used to derive and report PMI. In one example, the spatial domain matrix (W1) and the frequency basis (W f ) can be selected for each TRP group, and the coefficient It may be different for each TRP. For example, a plurality of TRP groups may include a first TRP group including a plurality of TRPs and a second TRP group including at least one TRP.

[0091] The first TRP group may have a matrix for the spatial domain (W 1,1 ), the first precoding index being common to all TRPs in the plurality of TRPs within the first TRP group, and the second TRP group may have a matrix for the spatial domain (W 1,2 ), which is common to all TRPs in the second TRP group. However, for the spatial domain matrix (W 1,1 ) and the first pre-decoding index for the spatial domain matrix (W 1,2 ) may be different. In such a scenario, the TRP sets for both the first TRP group and the second TRP group may include different coefficient matrices And because the frequency base can be based on each TRP group, the first TRP group can have a first frequency base matrix (W f,1 ), the first frequency base matrix is ​​common to all TRPs in the plurality of TRPs in the first TRP group. The second TRP group may have a second frequency base matrix (W f,2 ), the second frequency base matrix is ​​common to all TRPs in the plurality of TRPs in the second TRP group, and the first frequency base matrix and the second frequency base matrix may be different.

[0092] As an example, in a CJT between four (4) TRPs, when the first TRP group has three (3) co-located TRPs, and the second TRP group has a single TRP configured, the following codebook structure may be used to derive and report the PMI:

[0093]

[0094] And for TRP grouping between four TRPs, when the first TRP group has two co-located TRPs and the second TRP group has another two co-located TRP configurations, the following codebook structure can be used to derive and report the PMI:

[0095]

[0096] For CJT between four TRPs subdivided into three groups, where the first TRP group has two co-located TRPs, the second TRP group has a single TRP, and the third TRP group has another single TRP configured, the following codebook structure may be used to derive and report the PMI:

[0097]

[0098] For CJT between three TRPs, when the first TRP group includes two co-located TRPs and the second TRP group includes a configured single TRP, the following codebook structure may be used to derive and report the PMI:

[0099]

[0100] In summary, in some aspects, the UE may derive and report precoding information about the spatial basis matrix, the phase and amplitude of individual coefficients for different TRPs, and information about a common frequency base for all TRPs or about a frequency base for each TRP group on a per-TRP group basis.

[0101] In other scenarios, each group may also include a common phase Information, where the UE can derive and report the precoding information about the spatial basis matrix, the phase and amplitude of the coefficients, and the frequency that are common to each TRP group. In this case, for example, when the first group has three co-located TRPs and the second group has a single TRP configured, the following codebook structure can be used to derive and report the PMI:

[0102]

[0103] And when the first TRP group may include two co-located TRPs and the second TRP group may include other two co-located TRPs, the following codebook structure may be used to derive and report the PMI:

[0104]

[0105] In another example where the first TRP group has two co-located TRPs, and the second TRP group has a single TRP, and the third TRP group includes another single TRP, the following codebook structure may be used to derive and report the PMI:

[0106]

[0107] In the scenario between three TRPs, when the first group includes two co-located TRPs and the second group includes a single TRP, the following codebook structure may be used to derive and report the PMI:

[0108]

[0109] In summary, for such a scenario, the UE may derive and report precoding information about the spatial basis on a per-TRP group basis. The UE may also derive and report to the network entity information about the frequency basis also for each TRP group (or a single frequency basis for all TRPs) and coefficients on a per-TRP group basis. Additionally, the co-phase values ​​between different TRPs per TRP group may be It can be given an alphabet (e.g., QPSK or 8PSK), where g is the group index and N is the number of TRPs in the group.

[0110] In another example, the UE can derive and report each TRP group W1, each and the shared or per-TRP group W f Common phase of each POL In this case, for CIT between 4 TRPs, when the first group includes three (3) co-located TRPs and the second TRP group includes a single TRP, the following codebook structure is used to derive / report the PMI:

[0111]

[0112] For CJT between four TRPs, when the first TRP group includes two co-located TRPs and the second TRP group includes the other two co-located TRPs, the following codebook structure may be used to derive and report the PMI:

[0113]

[0114]

[0115] For CJT between four TRPs, when the first TRP group includes two co-located TRPs, the second TRP group includes a single TRP, and the third TRP group includes another single TRP, the following codebook structure may be used to derive and report the PMI:

[0116]

[0117] For CJT between three TRPs, when the first TRP group includes two co-located TRPs and the second TRP group includes a single TRP, the following codebook structure may be used to derive and report the PMI:

[0118]

[0119] In summary, for such examples, precoding information about W1 can be reported on a per-TRP group basis. Information about the frequency base (W1) can be derived on a per-TRP group (or a single frequency base for all TRPs). f ) and the coefficients can be derived and reported on a per TRP group basis Additionally, per-POL common phase values ​​may be derived and reported between different TRPs per TRP group.

[0120] Fig.10 1000 is a flow chart of a method 1000 of wireless communication that may be performed by a UE (e.g., UE 104, which may include memory 360 and which may be the entire UE 104 or a component of UE 104 (such as a local multi-TRP CSI reporting component 140, TX processor 368, RX processor 356 and / or controller / processor 359)) for performing CSI report generation for a local TRP. Method 1000 may be performed by UE 104 including local multi-TRP CSI reporting component 140.

[0121] In block 1010, method 1000 may include receiving, at a UE, a CSI-RS from a set of TRPs associated with a network entity, wherein at least a subset of TRPs from the set of TRPs may be physically co-located. In one aspect, for example, UE 104, Rx processor 356, controller / processor 359, and / or processor 1112 may execute localized multi-TRP CSI reporting component 140 may execute method 1010. Thus, UE 104, Rx processor 356, controller / processor 359, and / or processor 1112 executing localized multi-TRP CSI reporting component 140 may provide means for receiving, at a UE, a CSI-RS from a set of TRPs associated with a network entity.

[0122] In block 1020, the method 1000 may include generating a channel state information (CSI) report based on a coherent joint transmission (CJT) codebook indicating a common precoding index for a spatial domain matrix for a physically co-located subset of TRPs. In an aspect, for example, the UE 104, the controller / processor 359, and / or the processor 1112 may execute the localized multi-TRP CSI reporting component 140, and the CSI report generation component 143 in conjunction with the CJT codebook 142 may perform the method 1020. Thus, the UE 104, the controller / processor 359, and / or the processor 1112 may execute the localized multi-TRP CSI reporting component 140, and the CSI report generation component 143 in conjunction with the CJT codebook 142 may provide a means for generating a CSI report based on a CJT codebook indicating a common precoding index for a spatial domain matrix for a physically co-located subset of TRPs.

[0123] In sub-block 1022, block 1020 for generating a CSI report based on the CJT codebook may also optionally include using a common frequency base matrix for a subset of TRPs, and using a separate coefficient matrix for each TRP in a physically co-located subset of TRPs.

[0124] In sub-block 1024, block 1020 for generating a CSI report based on the CJT codebook may also optionally include using a common frequency base matrix and a common coefficient matrix for physically co-located TRP subsets.

[0125] In sub-block 1026, block 1020 for generating a CSI report based on the CJT codebook may optionally include using a different co-phase value for each TRP in the physically co-located TRP subset.

[0126] In sub-block 1028, block 1020 for generating a CSI report based on the CJT codebook may optionally include using different co-phase values ​​for different polarities (POL) of each TRP in the physically co-located TRP subset.

[0127] In sub-box 1030, box 1020 may include a method in which a TRP set may be subdivided into multiple TRP groups and each TRP group from the multiple TRP groups includes one or more TRPs that are physically co-located. In some examples, the UE may receive configuration information about multiple TRP groups. In some examples, the multiple TRP groups may include a first TRP group including multiple TRPs and a second TRP group including at least one TRP. The first TRP group may include a first precoding index for a spatial domain matrix, which is common to all TRPs in the multiple TRPs within the first TRP group, and the second TRP group may include a second precoding index for the spatial domain matrix, which is common to all TRPs within the second TRP group. However, the first precoding index for the spatial domain matrix and the second precoding index for the spatial domain matrix may be different. In some examples, the TRP sets for both the first TRP group and the second TRP group may include different coefficient matrices.

[0128] In some examples, the first TRP group may have a first frequency base matrix that is common to all TRPs in a plurality of TRPs within the first TRP group, and the second TRP group may have a frequency base matrix that is common to all TRPs in a plurality of TRPs within the second TRP group, and the first frequency base matrix and the second frequency base matrix may be different. Additionally or alternatively, generating a CSI report based on a CJT codebook may further include using a common frequency base matrix for a subset of TRPs across multiple TRP groups. The first TRP group may have a first set of common phase values ​​for each TRP within the first TRP group, and the second TRP group may have a second set of common phase values ​​for each TRP within the second TRP group. Additionally, the multiple TRP groups may have different polarities (POL) for the first TRP group and the second TRP group.

[0129] In block 1040, the method 1000 may include sending the CSI report to a network entity. In an aspect, for example, the UE 104, the Tx processor 368, the controller / processor 359, and / or the processor 1112 may execute the local multi-TRP CSI reporting component 140 and / or the transmitting component 144 to perform the steps of the method 1040. Thus, the UE 104, the Tx processor 368, the controller / processor 359, and / or the processor 1112 executing the local multi-TRP CSI reporting component 140 and / or the transmitting component 144 may provide a means for sending the CSI report to a network entity.

[0130] refer to Fig.11, an example of a specific implementation of the UE 104 may include various components, some of which have been described above, but these components also include components such as one or more processors 1112 and memory 1116 communicating via one or more buses 1144 and transceiver 1102, which can operate in conjunction with the modem 1114 and the local multi-TRP CSI reporting component 140 to implement one or more of the functions described herein related to CSI reporting for multiple TSPs. In addition, the one or more processors 1112, the modem 1114, the memory 1116, the transceiver 1102, the RF front end 1188, and the one or more antennas 1165 can be configured to support voice and / or data calls (simultaneous or non-simultaneous) in one or more radio access technologies. The antenna 1165 may include one or more antennas, antenna elements, and / or antenna arrays.

[0131] In one aspect, the one or more processors 1112 may include a modem 1114 using one or more modem processors. Various functions associated with the local multi-TRP CSI reporting component 140 may be included in the modem 1114 and / or the processor 1112, and in one aspect, these functions may be performed by a single processor, while in other aspects, different ones of these functions may be performed by a combination of two or more different processors. For example, in one aspect, the one or more processors 1112 may include a modem processor, or a baseband processor, or a digital signal processor, or a transmit processor, or a receiver processor, or any one or any combination of transceiver processors associated with the transceiver 1102. In other aspects, some of the features of the one or more processors 1112 and / or the modem 1114 associated with the local multi-TRP CSI reporting component 140 may be performed by the transceiver 1102.

[0132] In addition, the memory 1116 may be configured to store data used herein and / or local versions of the applications 1175, the local multi-TRP CSI reporting component 140, and / or one or more subcomponents thereof executed by the at least one processor 1112. The memory 1116 may include any type of computer-readable medium capable of being used by a computer or the at least one processor 1112, such as a random access memory (RAM), a read-only memory (ROM), a tape, a disk, an optical disk, a volatile memory, a non-volatile memory, and any combination thereof. In one aspect, for example, when the UE 104 is operating the at least one processor 1112 to execute the local multi-TRP CSI reporting component 140 and / or one or more subcomponents thereof, the memory 1116 may be a non-transitory computer-readable storage medium storing one or more computer-executable codes defining the local multi-TRP CSI reporting component 140 and / or one or more subcomponents thereof and / or data associated therewith.

[0133] The transceiver 1102 may include at least one receiver 1106 and at least one transmitter 1108. The receiver 1106 may include hardware, firmware, and / or software code that can be executed by a processor for receiving data, the code including instructions and stored in a memory (e.g., a computer-readable medium). The receiver 1106 may be, for example, a radio frequency (RF) receiver. In one aspect, the receiver 1106 may receive a signal transmitted by at least one base station 102. Additionally, the receiver 1106 may process such received signals and may also obtain measurements of the signal, such as, but not limited to, Ec / Io, SNR, RSRP, RSSI, etc. The transmitter 1108 may include hardware, firmware, and / or software code that can be executed by a processor for transmitting data, the code including instructions and stored in a memory (e.g., a computer-readable medium). Suitable examples of the transmitter 1108 may include, but are not limited to, an RF transmitter.

[0134] In addition, in an aspect, the UE 104 may include an RF front end 1188 that may operate in communication with the one or more antennas 1165 and the transceiver 1102 to receive and transmit radio transmissions, such as wireless communications transmitted by at least one base station 102 or wireless transmissions transmitted by the UE 104. The RF front end 1188 may be connected to the one or more antennas 1165 and may include one or more low noise amplifiers (LNAs) 1190, one or more switches 1192, one or more power amplifiers (PAs) 1198, and one or more filters 1196 for transmitting and receiving RF signals.

[0135] In one aspect, the LNA 1190 can amplify the received signal at a desired output level. In one aspect, each LNA 1190 can have a specified minimum gain value and a maximum gain value. In one aspect, the RF front end 1188 can use one or more switches 1192 to select a particular LNA 1190 and its specified gain value based on the desired gain value for a particular application.

[0136] In addition, for example, the RF front end 1188 can use one or more PAs 1198 to amplify the signal for RF output at a desired output power level. In one aspect, each PA 1198 can have a specified minimum gain value and a maximum gain value. In one aspect, the RF front end 1188 can use one or more switches 1192 to select a particular PA 1198 and its specified gain value based on a desired gain value for a particular application.

[0137] In addition, for example, the RF front end 1188 can filter the received signal using one or more filters 1196 to obtain an input RF signal. Similarly, in one aspect, for example, the output from the corresponding PA 1198 can be filtered using a corresponding filter 1196 to produce an output signal for transmission. In one aspect, each filter 1196 can be connected to a specific LNA 1190 and / or PA 1198. In one aspect, the RF front end 1188 can use one or more switches 1192 to select a transmit or receive path using a specified filter 1196, LNA 1190, and / or PA 1198 based on a configuration specified by the transceiver 1102 and / or the processor 1112.

[0138] Thus, the transceiver 1102 can be configured to transmit and receive wireless signals through one or more antennas 1165 via the RF front end 1188. In an aspect, the transceiver 1102 can be tuned to operate at a specified frequency so that the UE 104 can communicate, for example, with one or more base stations 102 or one or more cells associated with one or more base stations 102. In an aspect, the modem 1114 can configure the transceiver 1102 to operate at a specified frequency and power level based on, for example, a UE configuration of the UE 104 and a communication protocol used by the modem 1114.

[0139] In one aspect, the modem 1114 can be a multi-band-multi-mode modem that can process digital data and communicate with the transceiver 1102 so that the digital data is transmitted and received using the transceiver 1102. In one aspect, the modem 1114 can be multi-band and configured to support multiple frequency bands for a specific communication protocol. In one aspect, the modem 1114 can be multi-mode and configured to support multiple operating networks and communication protocols. In one aspect, the modem 1114 can control one or more components (e.g., RF front end 1188, transceiver 1102) of the UE 104 to implement the transmission and / or reception of signals from the network based on the specified modem configuration. In one aspect, the modem configuration can be based on the mode of the modem and the frequency band in use. In another aspect, the modem configuration can be based on the UE configuration information associated with the UE 104 provided by the network during cell selection and / or cell reselection.

[0140] It should be understood that the specific order or hierarchy of the blocks in the disclosed process / flowchart is merely an illustration of the exemplary method. It should be understood that the specific order or hierarchy of the blocks in the process / flowchart may be rearranged based on design preferences. Further, some blocks may be combined or omitted. The attached method claims provide the elements of each block in a sample order, but are not meant to be limited to the specific order or hierarchy provided.

[0141] Some further example clauses

[0142] Specific implementation examples are described in the following numbered clauses:

[0143] 1. A method for wireless communication, the method comprising:

[0144] receiving, at a user equipment (UE), a channel state information reference signal (CSI-RS) from a set of transmit reception points (TRPs) associated with a network entity, wherein at least a subset of the TRPs from the set of TRPs are physically co-located;

[0145] generating a channel state information (CSI) report based on a coherent joint transmission (CJT) codebook indicating a common precoding index for a spatial domain matrix for the physically co-located subset of TRPs; and

[0146] The CSI report is sent to the network entity.

[0147] 2. The method of clause 1, wherein generating the CSI report based on the CJT codebook further comprises: using a common frequency base matrix for the TRP subset, and using a separate coefficient matrix for each TRP in the TRP subset that is physically co-located.

[0148] 3. The method of clause 1 or 2, wherein generating the CSI report based on the CJT codebook further comprises: using a common frequency base matrix and a common coefficient matrix for the physically co-located TRP subsets.

[0149] 4. A method according to any of the preceding clauses, wherein generating the CSI report based on the CJT codebook includes: using a different co-phase value for each TRP in the physically co-located TRP subset.

[0150] 5. A method according to any of the preceding clauses, wherein generating the CSI report based on the CJT codebook includes: using different co-phase values ​​for different polarities (POL) of each TRP in the physically co-located TRP subset.

[0151] 6. A method according to any of the preceding clauses, wherein the TRP set is subdivided into a plurality of TRP groups, and each TRP group from the plurality of TRP groups comprises one or more TRPs that are physically co-located.

[0152] 7. A method according to any of the preceding clauses, further comprising:

[0153] Receive configuration information about the multiple TRP groups.

[0154] 8. The method of any of the preceding clauses, wherein the plurality of TRP groups comprises a first TRP group comprising a plurality of TRPs and a second TRP group comprising at least one TRP,

[0155] wherein the first TRP group has a first pre-coding index for a spatial domain matrix, the first pre-coding index being common to all TRPs in the plurality of TRPs within the first TRP group, and

[0156] Wherein the second TRP group has a second precoding index for the spatial domain matrix, the second precoding index is common to all TRPs in the second TRP group, and the first precoding index for the spatial domain matrix and the second precoding index for the spatial domain matrix are different.

[0157] 9. A method according to any of the preceding clauses, wherein the TRP sets for both the first TRP group and the second TRP group include different coefficient matrices.

[0158] 10. A method according to any of the preceding clauses, wherein the first TRP group has a first frequency base matrix, the first frequency base matrix is ​​common to all TRPs in the plurality of TRPs within the first TRP group, and

[0159] Wherein the second TRP group has a second frequency base matrix, the second frequency base matrix is ​​common to all TRPs in the multiple TRPs within the second TRP group, and the first frequency base matrix and the second frequency base matrix are different.

[0160] 11. A method according to any of the preceding clauses, wherein generating the CSI report based on the CJT codebook further comprises: using a common frequency base matrix for the TRP subset across the multiple TRP groups.

[0161] 12. A method according to any of the preceding clauses, wherein the first TRP group has a first set of common phase values ​​for each TRP within the first TRP group, and

[0162] Wherein the second TRP group has a second set of common phase values ​​for each TRP within the second TRP group.

[0163] 13. A method according to any of the preceding clauses, wherein the plurality of TRP groups have different polarities (POL) for the first TRP group and the second TRP group.

[0164] 14. An apparatus for wireless communication, the apparatus comprising:

[0165] a memory storing computer-executable instructions; and

[0166] a processor communicatively coupled to the memory and configured to execute the instructions to:

[0167] receiving, at a user equipment (UE), a channel state information reference signal (CSI-RS) from a set of transmit reception points (TRPs) associated with a network entity, wherein at least a subset of the TRPs from the set of TRPs are physically co-located;

[0168] generating a channel state information (CSI) report based on a coherent joint transmission (CJT) codebook indicating a common precoding index for a spatial domain matrix for the physically co-located subset of TRPs; and

[0169] The CSI report is sent to the network entity.

[0170] 15. An apparatus according to clause 14, wherein the processor configured to generate the CSI report based on the CJT codebook is also configured to: use a common frequency base matrix for the TRP subset and use a separate coefficient matrix for each TRP in the TRP subset that is physically co-located.

[0171] 16. An apparatus according to clause 14 or 15, wherein the processor configured to generate the CSI report based on the CJT codebook is also configured to: use a common frequency base matrix and a common coefficient matrix for the TRP subsets that are physically co-located.

[0172] 17. An apparatus according to clauses 14 to 16, wherein the processor configured to generate the CSI report based on the CJT codebook is further configured to: use a different co-phase value for each TRP in the physically co-located TRP subset.

[0173] 18. An apparatus according to clauses 14 to 17, wherein the processor configured to generate the CSI report based on the CJT codebook is also configured to: use different co-phase values ​​for different polarities (POL) of each TRP in the physically co-located TRP subset.

[0174] 19. An apparatus according to any of the preceding clauses, wherein the TRP set is subdivided into a plurality of TRP groups, and each TRP group from the plurality of TRP groups comprises one or more TRPs that are physically co-located.

[0175] 20. An apparatus according to any of the preceding clauses, wherein the processor is further configured to:

[0176] Receive configuration information about the multiple TRP groups.

[0177] 21. An apparatus according to any of the preceding clauses, wherein the plurality of TRP groups comprises a first TRP group comprising a plurality of TRPs and a second TRP group comprising at least one TRP, wherein the first TRP group has a first precoding index for a spatial domain matrix, the first precoding index being common to all TRPs in the plurality of TRPs within the first TRP group, and

[0178] Wherein the second TRP group has a second precoding index for the spatial domain matrix, the second precoding index is common to all TRPs in the second TRP group, and the first precoding index for the spatial domain matrix and the second precoding index for the spatial domain matrix are different.

[0179] 22. An apparatus according to any of the preceding clauses, wherein the TRP sets for both the first TRP group and the second TRP group include different coefficient matrices.

[0180] 23. An apparatus according to any of the preceding clauses, wherein the first TRP group has a first frequency base matrix, the first frequency base matrix is ​​common to all TRPs in the plurality of TRPs within the first TRP group, and

[0181] Wherein the second TRP group has a second frequency base matrix, the second frequency base matrix is ​​common to all TRPs in the multiple TRPs within the second TRP group, and the first frequency base matrix and the second frequency base matrix are different.

[0182] 24. An apparatus according to any of the preceding clauses, wherein the processor configured to generate the CSI report based on the CJT codebook is also configured to: use a common frequency base matrix for the TRP subset across the multiple TRP groups.

[0183] 25. An apparatus according to any of the preceding clauses, wherein the first TRP group has a first set of common phase values ​​for each TRP within the first TRP group, and

[0184] Wherein the second TRP group has a second set of common phase values ​​for each TRP within the second TRP group.

[0185] 26. An apparatus according to any of the preceding clauses, wherein the plurality of TRP groups have different polarities (POL) for the first TRP group and the second TRP group.

[0186] 27. An apparatus for wireless communication, the apparatus comprising:

[0187] means for receiving, at a user equipment (UE), a channel state information reference signal (CSI-RS) from a set of transmit reception points (TRPs) associated with a network entity, wherein at least a subset of the TRPs from the set of TRPs are physically co-located;

[0188] means for generating a channel state information (CSI) report based on a coherent joint transmission (CJT) codebook indicating a common precoding index for a spatial domain matrix for the physically co-located subset of TRPs; and

[0189] means for sending the CSI report to the network entity.

[0190] 28. A non-transitory computer readable medium storing computer executable code, which, when executed by a processor, causes the processor to:

[0191] receiving, at a user equipment (UE), a channel state information reference signal (CSI-RS) from a set of transmit reception points (TRPs) associated with a network entity, wherein at least a subset of the TRPs from the set of TRPs are physically co-located;

[0192] generating a channel state information (CSI) report based on a coherent joint transmission (CJT) codebook indicating a common precoding index for a spatial domain matrix for the physically co-located subset of TRPs; and

[0193] The CSI report is sent to the network entity.

[0194] The preceding description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects. Therefore, the claims are not intended to be limited to the aspects shown herein, but to conform to the full scope consistent with the language claims, wherein unless otherwise specified, the elements mentioned in the singular are not intended to represent "one and only one", but "one or more". The word "exemplary" is used herein to mean "used as an example, instance, or illustration". Any aspect described as "exemplary" herein is not necessarily interpreted as being preferred or having advantages over other aspects. Unless otherwise specified, the term "some" refers to one or more. Combinations such as "at least one of A, B, or C", "one or more of A, B, or C", "at least one of A, B, and C", "one or more of A, B, and C", and "A, B, C, or any combination thereof", including any combination of A, B, and / or C, which may include multiple A, multiple B, or multiple C. Specifically, combinations such as "at least one of A, B, or C," "one or more of A, B, or C," "at least one of A, B and C," "one or more of A, B, and C," and "A, B, C, or any combination thereof" may be A only, B only, C only, A and B, A and C, B and C, or A and B and C, wherein any such combination may include one or more members of A, B, or C. All structural and functional equivalents of the elements of the various aspects described throughout the present disclosure that are or will later become known to a person of ordinary skill in the art are expressly incorporated herein by reference and are intended to be covered by the claims. In addition, nothing disclosed herein is intended to be dedicated to the public, regardless of whether such disclosure is expressly recited in the claims. Words such as "module," "mechanism," "element," "device," etc. cannot replace the word "component." Therefore, no claim element will be understood to be a part plus function unless the element is expressly recited using the phrase "component for..."

Claims

1. A method for wireless communication, the method comprising: receiving, at a user equipment (UE), a channel state information reference signal (CSI-RS) from a set of transmit reception points (TRPs) associated with a network entity, wherein at least a subset of the TRPs from the set of TRPs are physically co-located; generating a channel state information (CSI) report based on a coherent joint transmission (CJT) codebook indicating a common precoding index for a spatial domain matrix for the physically co-located subset of TRPs; as well as The CSI report is sent to the network entity.

2. The method according to claim 1, wherein generating the CSI report based on the CJT codebook further comprises: A common frequency base matrix is ​​used for the TRP subset, and a separate coefficient matrix is ​​used for each TRP in the TRP subset that is physically co-located.

3. The method according to claim 1, wherein generating the CSI report based on the CJT codebook further comprises: A common frequency base matrix and a common coefficient matrix are used for the physically co-located TRP subsets.

4. The method according to claim 3, wherein generating the CSI report based on the CJT codebook comprises: A different co-phase value is used for each TRP in the physically co-located subset of TRPs.

5. The method according to claim 3, wherein generating the CSI report based on the CJT codebook comprises: Different co-phase values ​​are used for different polarities (POL) of each TRP in the physically co-located subset of TRPs.

6. The method of claim 3, wherein the TRP set is subdivided into a plurality of TRP groups, and each TRP group from the plurality of TRP groups includes one or more TRPs that are physically co-located.

7. The method according to claim 6, further comprising: Receive configuration information about the multiple TRP groups.

8. The method of claim 6, wherein the plurality of TRP groups include a first TRP group including a plurality of TRPs and a second TRP group including at least one TRP, wherein the first TRP group has a first precoding index for a spatial domain matrix, the first precoding index being common to all TRPs in the plurality of TRPs within the first TRP group, and Wherein the second TRP group has a second precoding index for the spatial domain matrix, the second precoding index is common to all TRPs in the second TRP group, and the first precoding index for the spatial domain matrix and the second precoding index for the spatial domain matrix are different.

9. The method of claim 8, wherein the TRP sets for both the first TRP group and the second TRP group include different coefficient matrices.

10. The method of claim 8, wherein the first TRP group has a first frequency base matrix that is common to all TRPs in the plurality of TRPs within the first TRP group, and Wherein the second TRP group has a second frequency base matrix, the second frequency base matrix is ​​common to all TRPs in the multiple TRPs within the second TRP group, and the first frequency base matrix and the second frequency base matrix are different.

11. The method according to claim 8, wherein generating the CSI report based on the CJT codebook further comprises: A common frequency base matrix is ​​used for the TRP subset across the multiple TRP groups.

12. The method of claim 8, wherein the first TRP group has a first set of common phase values ​​for each TRP within the first TRP group, and Wherein the second TRP group has a second set of common phase values ​​for each TRP within the second TRP group.

13. The method of claim 8, wherein the plurality of TRP groups have different polarities (POL) for the first TRP group and the second TRP group.

14. An apparatus for wireless communication, the apparatus comprising: a memory storing computer executable instructions; and a processor communicatively coupled to the memory and configured to execute the instructions to: receiving, at a user equipment (UE), a channel state information reference signal (CSI-RS) from a set of transmit reception points (TRPs) associated with a network entity, wherein at least a subset of the TRPs from the set of TRPs are physically co-located; generating a channel state information (CSI) report based on a coherent joint transmission (CJT) codebook indicating a common precoding index for a spatial domain matrix for the physically co-located subset of TRPs; as well as The CSI report is sent to the network entity.

15. The apparatus of claim 14, wherein the processor configured to generate the CSI report based on the CJT codebook is further configured to use a common frequency base matrix for the TRP subset and to use a separate coefficient matrix for each TRP in the TRP subset that is physically co-located.

16. The apparatus of claim 14, wherein the processor configured to generate the CSI report based on the CJT codebook is further configured to use a common frequency base matrix and a common coefficient matrix for the physically co-located TRP subsets.

17. The apparatus of claim 16, wherein the processor configured to generate the CSI report based on the CJT codebook is further configured to use a different co-phase value for each TRP in the physically co-located TRP subset.

18. The apparatus of claim 16, wherein the processor configured to generate the CSI report based on the CJT codebook is further configured to use different co-phase values ​​for different polarities (POL) of each TRP in the physically co-located TRP subset.

19. The apparatus of claim 16, wherein the TRP set is subdivided into a plurality of TRP groups, and each TRP group from the plurality of TRP groups includes one or more TRPs that are physically co-located.

20. The apparatus of claim 19, wherein the processor is further configured to: Receive configuration information about the multiple TRP groups.

21. The apparatus of claim 19, wherein the plurality of TRP groups include a first TRP group including a plurality of TRPs and a second TRP group including at least one TRP, wherein the first TRP group has a first precoding index for a spatial domain matrix, the first precoding index being common to all TRPs in the plurality of TRPs within the first TRP group, and Wherein the second TRP group has a second precoding index for the spatial domain matrix, the second precoding index is common to all TRPs in the second TRP group, and the first precoding index for the spatial domain matrix and the second precoding index for the spatial domain matrix are different.

22. The apparatus of claim 21, wherein the TRP sets for both the first TRP group and the second TRP group comprise different coefficient matrices.

23. The apparatus of claim 21, wherein the first TRP group has a first frequency base matrix that is common to all TRPs in the plurality of TRPs within the first TRP group, and Wherein the second TRP group has a second frequency base matrix, the second frequency base matrix is ​​common to all TRPs in the multiple TRPs within the second TRP group, and the first frequency base matrix and the second frequency base matrix are different.

24. The apparatus of claim 21, wherein the processor configured to generate the CSI report based on the CJT codebook is further configured to use a common frequency base matrix for the TRP subset across the plurality of TRP groups.

25. The apparatus of claim 21, wherein the first TRP group has a first set of common phase values ​​for each TRP within the first TRP group, and Wherein the second TRP group has a second set of common phase values ​​for each TRP within the second TRP group.

26. The apparatus of claim 21, wherein the plurality of TRP groups have different polarities (POL) for the first TRP group and the second TRP group.

27. An apparatus for wireless communication, the apparatus comprising: means for receiving, at a user equipment (UE), a channel state information reference signal (CSI-RS) from a set of transmit reception points (TRPs) associated with a network entity, wherein at least a subset of the TRPs from the set of TRPs are physically co-located; means for generating a channel state information (CSI) report based on a coherent joint transmission (CJT) codebook indicating a common precoding index for a spatial domain matrix for the physically co-located subset of TRPs; and means for sending the CSI report to the network entity.

28. A non-transitory computer readable medium storing computer executable code, which, when executed by a processor, causes the processor to: receiving, at a user equipment (UE), a channel state information reference signal (CSI-RS) from a set of transmit reception points (TRPs) associated with a network entity, wherein at least a subset of the TRPs from the set of TRPs are physically co-located; generating a channel state information (CSI) report based on a coherent joint transmission (CJT) codebook indicating a common precoding index for a spatial domain matrix for the physically co-located subset of TRPs; as well as The CSI report is sent to the network entity.

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