Type II coherent joint transmit codebook for multiple transmit and receive points having same transmit power per transmit and receive point

Abstract

Certain aspects of the present disclosure provide techniques for determining coefficients of a codebook for coherent joint transmission (CJT) by multiple transmit points (TRPs) transmitted at the same transmit power per transmit and receive point (TRP). A method capable of being performed by a user equipment (UE) includes receiving configuration information indicating resources associated with at least two transmit receive points (TRPs), the UE configured to communicate with the at least two TRPs using a codebook structure having a coefficient matrix shared between the at least two TRPs; measuring channel state information (CSI) reference signals (CSI-RS) from the at least two TRPs according to the configuration information; and transmitting a report with coefficients of the coefficient matrix for sharing between the at least two TRPs.

Description

Background Art Technical Field

[0001] Various aspects of the present disclosure relate to wireless communications, and more particularly to techniques for determining coefficients of a codebook for coherent joint transmission (CJT) performed by multiple transmit and receive points (TRPs) transmitting at the same transmit power per TRP.

[0002] Related technologies

[0003] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcasts or other similar types of services. These wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available wireless communication system resources.

[0004] Although wireless communication systems have made tremendous technical progress over the years, challenges still exist. For example, complex and dynamic environments can still attenuate or block signals between wireless transmitters and wireless receivers. Therefore, there is a continuous desire to improve the technical performance of wireless communication systems, including, for example: improving the speed and data carrying capacity of communications, improving the efficiency of using shared communication media, reducing the power used by transmitters and receivers when performing communications, improving the reliability of wireless communications, avoiding redundant transmission and / or reception and related processing, improving the coverage area of ​​wireless communications, increasing the number and types of devices that can access wireless communication systems, increasing the ability of different types of devices to communicate with each other, increasing the number and types of wireless communication media available for use, etc. Therefore, there is a need to further improve wireless communication systems to overcome the aforementioned technical challenges and other challenges. Summary of the invention

[0005] One aspect provides a method for wireless communication by a user equipment (UE). The method includes: receiving configuration information indicating resources associated with at least two transmit receive points (TRPs), the UE being configured to communicate with the at least two TRPs using a codebook structure having a coefficient matrix shared between the at least two TRPs; measuring a channel state information (CSI) reference signal (CSI-RS) from the at least two TRPs according to the configuration information; and sending a report having coefficients of the coefficient matrix shared between the at least two TRPs.

[0006] On the other hand, a method for wireless communication by a network entity is provided. The method includes: sending configuration information indicating resources associated with at least two TRPs, the UE being configured to communicate with the at least two TRPs using a codebook structure having a coefficient matrix shared between the at least two TRPs; and receiving a report having coefficients for the coefficient matrix shared between the at least two TRPs.

[0007] Other aspects provide: an apparatus operable to, configured to, or otherwise adapted to perform any one or more of the foregoing methods and / or those described elsewhere herein; a non-transitory computer-readable medium comprising instructions that, when executed by a processor of the apparatus, cause the apparatus to perform the foregoing methods and those described elsewhere herein; a computer program product embodied on a computer-readable storage medium, comprising code for performing the foregoing methods and those described elsewhere herein; and / or an apparatus comprising components for performing the foregoing methods and those described elsewhere herein. By way of example, an apparatus may include a processing system, a device having a processing system, or a processing system cooperating through one or more networks.

[0008] For purposes of illustration, the following description and drawings set forth certain features. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The accompanying drawings depict certain features of the various aspects described herein and should not be considered to limit the scope of the disclosure.

[0010] Figure 1 An example wireless communication network is depicted.

[0011] Figure 2 An example disaggregated base station architecture is depicted.

[0012] Figure 3 Aspects of an example base station and example user equipment are depicted.

[0013] Figure 4A , Figure 4B , Figure 4C and Figure 4D Various example aspects of data structures for a wireless communication network are described.

[0014] Figure 5 A conceptual example of a pre-decoder matrix is ​​illustrated.

[0015] Figure 6 is a block diagram illustrating an example of a codebook-based CSF.

[0016] Figure 7 An example transmitter receiver point (TRP) scenario is illustrated.

[0017] Figures 8 to 9 A conceptual example of a pre-decoder matrix is ​​illustrated.

[0018] Fig.10 Various coherent joint transmission (CJT) and non-coherent joint transmission (NCJT) scenarios are illustrated.

[0019] Fig.11 Techniques for performing strongest coefficient indication (SCI) based differential quantization in accordance with aspects of the present disclosure are illustrated.

[0020] Fig.12 Codebook subset restriction (CBSR) according to aspects of the present disclosure is illustrated.

[0021] Fig.13 Example bitmaps for a CBSR according to aspects of the present disclosure are illustrated.

[0022] Fig.14 The use of a typical mode 2 frequency domain joint codebook for dual beam transmission from two TRPs in accordance with various aspects of the present disclosure is illustrated.

[0023] Fig.15A and Fig. 15B The use of a mode 2 frequency domain joint codebook for dual beam transmissions from two TRPs in accordance with various aspects of the present disclosure is illustrated.

[0024] Fig.16 A method for wireless communication is described.

[0025] Fig.17 A method for wireless communication is described.

[0026] Fig.18 Aspects of an example communications device are depicted. DETAILED DESCRIPTION

[0027] Various aspects of the present disclosure provide apparatus, methods, processing systems, and computer-readable media for determining coefficients of a codebook for coherent joint transmission (CJT) performed by multiple transmit and receive points (TRPs) transmitting at the same transmit power per TRP.

[0028] Coherent Joint Transmission (CJT) can achieve higher data throughput and more reliable signaling to the UE. CJT involves multiple devices, each sending a beam transmission to the device. The transmitting devices cooperate so that the receiving device can combine the transmissions into a signal. In a system utilizing TRPs, when transmitting to a UE using CJT, multiple TRPs can each send a signal to the UE.

[0029] In some network deployments, each TRP transmits DL transmissions at the same power. However, for two typical codebooks (mode 1 codebook and mode 2 codebook), each TRP performing CJT has a DL power determined based on different values, and therefore using such typical codebooks for CJT may not guarantee transmissions from each TRP (e.g., 2 TRPs A and B) at the same power. Although another technique can be used to limit the pre-decoder to achieve the same power per TRP, in this case, the performance of the pre-decoder may not be optimized.

[0030] Various aspects of the present disclosure provide techniques for determining a codebook that provides improved performance while supporting constant per-TRP power. The codebook is constructed by determining coefficients shared between TRPs based on the number of SD bases for the TRPs arranged in a non-diagonal spatial domain (SD) basis matrix.

[0031] Various aspects of the present disclosure provide techniques that can enable the use of CJTs from TRPs that transmit at the same transmit power, which can improve the overall system performance of systems that use TRPs that transmit at the same transmit power.

[0032] Introduction to wireless communication networks

[0033] The techniques and methods described herein can be used in various wireless communication networks. Although various aspects may be described herein using terms commonly associated with 3G, 4G and / or 5G wireless technologies, various aspects of the present disclosure may also be applicable to other communication systems and standards not explicitly mentioned herein.

[0034] Figure 1 An example of a wireless communication network 100 is depicted in which various aspects described herein may be implemented.

[0035] In general, the wireless communication network 100 includes various network entities (alternatively, network elements or network nodes). A network entity is typically a communication device and / or a communication function performed by a communication device (e.g., user equipment (UE), base station (BS), component of a BS, server, etc.). For example, various functions of a network and various devices associated with and interacting with the network may be considered network entities. In addition, the wireless communication network 100 includes ground aspects, such as ground-based network entities (e.g., BS 102), and non-ground aspects, such as satellites 140 and aircraft 145, which may include airborne network entities (e.g., one or more BSs) capable of communicating with other network elements (e.g., ground BSs) and user equipment.

[0036] In the depicted example, the wireless communication network 100 includes a BS 102, a UE 104, and one or more core networks (such as an evolved packet core (EPC) 160 and a 5G core (5GC) network 190) that interoperate to provide communication services over various communication links (including wired links and wireless links).

[0037] Figure 1 Various example UEs 104 are depicted, which may more generally 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, a camera, a game console, a tablet computer, 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, an Internet of Things (IoT) device, an Always-On (AON) device, an edge processing device, or other similar devices. UE 104 may also be more generally referred to as a mobile device, a wireless device, a wireless communication device, a station, a mobile station, a subscriber station, a mobile subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a remote device, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, and other user equipment.

[0038] BS 102 wirelessly communicates with (e.g., transmits signals to or receives signals from) UE 104 via communication link 120. Communication link 120 between BS 102 and UE 104 may include uplink (UL) (also referred to as a reverse link) transmissions from UE 104 to BS 102 and / or downlink (DL) (also referred to as a forward link) transmissions from BS 102 to UE 104. In various aspects, communication link 120 may use multiple-input multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and / or transmit diversity.

[0039] BS 102 may generally include: a Node B, an enhanced Node B (eNB), a next generation enhanced Node B (ng-eNB), a next generation Node B (gNB or gNodeB), an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a transmit / receive point, and / or other base stations. Each of BSs 102 may provide communication coverage for a corresponding geographic coverage area 110, which may sometimes be referred to as a cell, and may overlap in some cases (e.g., a small cell 102' may have a coverage area 110' that overlaps with a coverage area 110 of a macro cell). For example, a BS may provide communication coverage for a macro cell (covering a relatively large geographic area), a pico cell (covering a relatively small geographic area, such as a stadium), a femto cell (a relatively small geographic area (e.g., a home)), and / or other types of cells.

[0040] Although BS102 is depicted as a single communication device in various aspects, BS102 can be implemented in various configurations. For example, one or more components of the base station may be decomposed, including a central unit (CU), one or more distributed units (DU), one or more radio units (RU), a near real-time (near RT) RAN intelligent controller (RIC), or a non-real-time (non-RT) RIC, to name a few examples. In another example, various aspects of the base station may be virtualized. More generally, a base station (e.g., BS102) may include components located at a single physical location or components located at various physical locations. In an example in which the base station includes components located at various physical locations, the various components may each perform a function so that the various components together implement functionality similar to that of a base station located at a single physical location. In some aspects, a base station including components located at various physical locations may be referred to as a decomposed radio access network architecture (such as an open RAN (O-RAN) or virtualized RAN (VRAN) architecture). Figure 2 An example decomposed base station architecture is depicted and described.

[0041] Different BSs 102 within the wireless communication network 100 may also be configured to support different radio access technologies (such as 3G, 4G, and / or 5G). For example, a BS 102 configured for 4G LTE (collectively referred to as Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) may interface with the EPC 160 via a first backhaul link 132 (e.g., an S1 interface). A BS 102 configured for 5G (e.g., 5G NR or Next Generation RAN (NG-RAN)) may interface with the 5GC 190 via a second backhaul link 184. The BSs 102 may communicate with each other directly or indirectly (e.g., via the EPC 160 or the 5GC 190) via a third backhaul link 134 (e.g., an X2 interface), which may be wired or wireless.

[0042] The wireless communication network 100 may subdivide the electromagnetic spectrum into various categories, frequency bands, channels, or other characteristics. In some aspects, the subdivision is provided based on wavelength and frequency, where frequency may also be referred to as a carrier, subcarrier, channel, tone, or subband. For example, 3GPP currently defines frequency range 1 (FR1) as including 410 MHz to 7125 MHz, which is often (interchangeably) referred to as "below 6 GHz". Similarly, 3GPP currently defines frequency range 2 (FR2) as including 24,250 MHz to 52,600 MHz, which is sometimes (interchangeably) referred to as "millimeter wave" ("mmW" or "mmWave"). A base station (e.g., a mmWave base station such as BS180) configured to communicate using mmWave / near mmWave radio bands may utilize beamforming (e.g., 182) with a UE (e.g., 104) to improve path loss and range.

[0043] The communication link 120 between the BS 102 and, for example, the UE 104 may be through one or more carriers, which may have different bandwidths (e.g., 5 MHz, 10 MHz, 15 MHz, 20 MHz, 100 MHz, 400 MHz, and / or other MHz) and may be aggregated in various aspects. The 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 ​​than for UL).

[0044] Communications using higher frequency bands may have higher path loss and shorter range than communications at lower frequencies. Figure 1 180) may utilize beamforming 182 with UE 104 to improve path loss and range. For example, BS 180 and UE 104 may each include multiple antennas, such as antenna elements, antenna panels, and / or antenna arrays, to facilitate beamforming. In some cases, BS 180 may send beamformed signals to UE 104 in one or more transmit directions 182'. UE 104 may receive beamformed signals from BS 180 in one or more receive directions 182". UE 104 may also send beamformed signals to BS 180 in one or more transmit directions 182". BS 180 may also receive beamformed signals from UE 104 in one or more receive directions 182'. BS 180 and UE 104 may then perform beam training to determine an optimal receive direction and an optimal transmit direction for each of BS 180 and UE 104. It is noteworthy that the transmit direction and receive direction of BS 180 may be the same or may not be the same. Similarly, the transmit direction and receive direction of UE 104 may or may not be the same.

[0045] Wireless communication network 100 also includes a Wi-Fi AP 150 that communicates with a Wi-Fi station (STA) 152 via a communication link 154 in, for example, the 2.4 GHz and / or 5 GHz unlicensed spectrum.

[0046] Certain UEs 104 may communicate with each other using a device-to-device (D2D) communication link 158. 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), a physical sidelink control channel (PSCCH), and / or a physical sidelink feedback channel (PSFCH).

[0047] The EPC 160 may include various functional components, including: 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 / or a packet data network (PDN) gateway 172, such as in the depicted example. 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.

[0048] Generally speaking, user Internet Protocol (IP) packets are delivered 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 the IP Services 176, which may include, for example, the Internet, an Intranet, an IP Multimedia Subsystem (IMS), a Packet Switched (PS) streaming media service, and / or other IP services.

[0049] 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 within a public land mobile network (PLMN), and / or may be used to schedule MBMS delivery. The MBMS Gateway 168 may be used to distribute MBMS services to BSs 102 belonging to a multicast broadcast single frequency network (MBSFN) area broadcasting a specific service, and / or may be responsible for session management (start / stop) and for collecting eMBMS related charging information.

[0050] 5GC 190 may include various functional components, including: access and mobility management function (AMF) 192, other AMFs 193, session management function (SMF) 194, and user plane function (UPF) 195. AMF 192 may communicate with unified data management (UDM) 196.

[0051] AMF 192 is a control node that handles signaling between UE 104 and 5GC 190. AMF 192 provides, for example, Quality of Service (QoS) flow and session management.

[0052] Internet Protocol (IP) packets are delivered through UPF 195, which is connected to IP Services 197 and provides IP address allocation for UEs and other functions for 5GC 190. IP Services 197 may include, for example, the Internet, Intranet, IMS, PS streaming services, and / or other IP services.

[0053] In various aspects, a network entity or network node may be implemented as a converged base station, a decomposed base station, a component of a base station, an integrated access and backhaul (IAB) node, a relay node, a sidelink node, to name a few examples.

[0054] Figure 2 An example disaggregated base station 200 architecture is depicted. The disaggregated base station 200 architecture may include one or more central units (CUs) 210 that may communicate directly with a core network 220 via a backhaul link, or indirectly with the core network 220 through one or more disaggregated base station units, such as a near real-time (near-RT) RAN intelligent controller (RIC) 225 via an E2 link, or a non-real-time (non-RT) RIC 215 associated with a service management and orchestration (SMO) framework 205, or both. The CU 210 may communicate with one or more distributed units (DUs) 230 via respective midhaul links, such as an F1 interface. The DU 230 may communicate with one or more radio units (RUs) 240 via respective fronthaul links. The RU 240 may communicate with respective UEs 104 via one or more radio frequency (RF) access links. In some implementations, a UE 104 may be served simultaneously by multiple RUs 240.

[0055] Each of these units (e.g., CU 210, DU 230, RU 240, and near-RT RIC 225, non-RT RIC 215, and SMO framework 205) may include or be coupled to one or more interfaces configured to receive or send signals, data, or information (collectively referred to as signals) via a wired or wireless transmission medium. Each of these units or an associated processor or controller that provides instructions to the communication interface of these units may be configured to communicate with one or more of the other units via a transmission medium. For example, these units may include a wired interface configured to receive or send signals to one or more of the other units via a wired transmission medium. Additionally or alternatively, these units may include a wireless interface that may include a receiver, transmitter, or transceiver (such as a radio frequency (RF) transceiver) configured to receive signals on a wireless transmission medium or send signals to one or more of the other units, or both.

[0056] In some aspects, CU 210 may host one or more higher layer control functions. Such control functions may include radio resource control (RRC), packet data convergence protocol (PDCP), service data adaptation protocol (SDAP), etc. Each control function may be implemented using an interface configured to communicate signals with other control functions hosted by CU 210. CU 210 may be configured to handle user plane functionality (e.g., central unit-user plane (CU-UP)), control plane functionality (e.g., central unit-control plane (CU-CP)), or a combination thereof. In some specific implementations, CU 210 may be logically split into one or more CU-UP units and one or more CU-CP units. When implemented in an O-RAN configuration, the CU-UP unit may communicate bidirectionally with the CU-CP unit via an interface (such as an E1 interface). As needed, CU 210 may be implemented to communicate with DU 230 for network control and signaling.

[0057] DU 230 may correspond to a logical unit that includes one or more base station functions for controlling the operation of one or more RUs 240. In some aspects, DU 230 may host one or more of a radio link control (RLC) layer, a medium access control (MAC) layer, and one or more high physical (PHY) layers (such as modules for forward error correction (FEC) encoding and decoding, scrambling, modulation and demodulation, etc.) at least in part according to functional divisions such as those defined by the 3rd Generation Partnership Project (3GPP). In some aspects, DU 230 may also host one or more low PHY layers. Each layer (or module) may be implemented using an interface that is configured to communicate signals with other layers (and modules) hosted by DU 230 or with control functions hosted by CU 210.

[0058] The lower layer functionality may be implemented by one or more RUs 240. In some deployments, the RU 240 controlled by the DU 230 may correspond to a logical node that hosts RF processing functions or low PHY layer functions (such as performing fast Fourier transform (FFT), inverse FFT (iFFT), digital beamforming, physical random access channel (PRACH) extraction and filtering, etc.), or both, based at least in part on functional splitting (such as lower layer functional splitting). In such an architecture, the RU 240 may be implemented to handle over-the-air (OTA) communications with one or more UEs 104. In some specific implementations, real-time and non-real-time aspects of control plane and user plane communications with the RU 240 may be controlled by the corresponding DU 230. In some scenarios, this configuration may enable the implementation of the DU 230 and the CU 210 in a cloud-based RAN architecture (such as a vRAN architecture).

[0059] The SMO framework 205 may be configured to support RAN deployment and provisioning of non-virtualized network elements and virtualized network elements. For non-virtualized network elements, the SMO framework 205 may be configured to support the deployment of dedicated physical resources for RAN coverage requirements, which may be managed via an operation and maintenance interface (such as an O1 interface). For virtualized network elements, the SMO framework 205 may be configured to interact with a cloud computing platform (such as an open cloud (O-Cloud) 290) to perform network element lifecycle management (such as to instantiate virtualized network elements) via a cloud computing platform interface (such as an O2 interface). Such virtualized network elements may include, but are not limited to, CU 210, DU 230, RU 240, and near-RT RIC 225. In some specific implementations, the SMO framework 205 may communicate with hardware aspects of the 4G RAN (such as an open eNB (O-eNB) 211) via the O1 interface. Additionally, in some specific implementations, the SMO framework 205 may communicate directly with one or more RUs 240 via the O1 interface. The SMO framework 205 may also include a non-RT RIC 215 configured to support the functionality of the SMO framework 205 .

[0060] The non-RT RIC 215 may be configured to include logic functions that enable non-real-time control and optimization of RAN elements and resources, artificial intelligence / machine learning (AI / ML) workflows including model training and updating, or policy-based guidance of applications / features in the near-RT RIC 225. The non-RT RIC 215 may be coupled to or in communication with the near-RT RIC 225 (such as via an A1 interface). The near-RT RIC 225 may be configured to include logic functions that enable near-real-time control and optimization of RAN elements and resources via data collection and actions through an interface (such as via an E2 interface) that connects one or more CUs 210, one or more DUs 230, or both, and the O-eNB with the near-RT RIC 225.

[0061] In some implementations, in order to generate an AI / ML model to be deployed in the near-RT RIC 225, the non-RT RIC 215 may receive parameters or external enrichment information from an external server. Such information may be utilized by the near-RT RIC 225 and may be received from a non-network data source or from a network function at the SMO framework 205 or the non-RT RIC 215. In some examples, the non-RT RIC 215 or the near-RT RIC 225 may be configured to adjust RAN behavior or performance. For example, the non-RT RIC 215 may monitor long-term trends and patterns of performance and employ AI / ML models to perform corrective actions through the SMO framework 205 (such as via reconfiguration of O1) or via the creation of RAN management policies (such as A1 policies).

[0062] Figure 3 Aspects of an example BS 102 and UE 104 are depicted.

[0063] In general, BS 102 includes various processors (e.g., 320, 330, 338, and 340), antennas 334a to 334t (collectively 334), transceivers 332a to 332t (collectively 332) including modulators and demodulators, and other aspects that enable wireless transmission of data (e.g., data source 312) and wireless reception of data (e.g., data sink 339). For example, BS 102 can transmit and receive data between BS 102 and UE 104. BS 102 includes controller / processor 340 that can be configured to implement various functions described herein related to wireless communications.

[0064] In general, the UE 104 includes various processors (e.g., 358, 364, 366, and 380), antennas 352a to 352r (collectively 352), transceivers 354a to 354r (collectively 354) including modulators and demodulators, and other aspects that enable wireless transmission of data (e.g., retrieved from a data source 362) and wireless reception of data (e.g., provided to a data sink 360). The UE 104 includes a controller / processor 380 that can be configured to implement various functions described herein related to wireless communications.

[0065] Regarding example downlink transmissions, BS 102 includes a transmit processor 320 that can receive data from a data source 312 and control information from a controller / processor 340. The control information can be for a physical broadcast channel (PBCH), a physical control format indicator channel (PCFICH), a physical HARQ indicator channel (PHICH), a physical downlink control channel (PDCCH), a group common PDCCH (GC PDCCH), and / or other channels. In some examples, the data can be for a physical downlink shared channel (PDSCH).

[0066] The transmit processor 320 may process (e.g., encode and symbol map) data and control information to obtain data symbols and control symbols, respectively. The transmit processor 320 may also generate reference symbols (such as for a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a PBCH demodulation reference signal (DMRS), and a channel state information reference signal (CSI-RS)).

[0067] The transmit (TX) multiple-input multiple-output (MIMO) processor 330 may perform spatial processing (e.g., pre-coding) on ​​data symbols, control symbols, and / or reference symbols, where applicable, and may provide an output symbol stream to a modulator (MOD) in transceivers 332a to 332t. Each modulator in transceivers 332a to 332t may process a corresponding output symbol stream to obtain an output sample stream. Each modulator may further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The downlink signals from the modulators in transceivers 332a to 332t may be transmitted via antennas 334a to 334t, respectively.

[0068] To receive downlink transmissions, UE 104 includes antennas 352a to 352r that can receive downlink signals from BS 102 and can provide received signals to demodulators (DEMODs) in transceivers 354a to 354r, respectively. Each demodulator in transceivers 354a to 354r can condition (e.g., filter, amplify, downconvert, and digitize) a corresponding received signal to obtain input samples. Each demodulator can further process the input samples to obtain received symbols.

[0069] A MIMO detector 356 may obtain received symbols from all demodulators in transceivers 354a through 354r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. A receive processor 358 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for UE 104 to a data sink 360, and provide decoded control information to a controller / processor 380.

[0070] With respect to example uplink transmissions, the UE 104 also includes a transmit processor 364 that may receive and process data from a data source 362 (e.g., for a PUSCH) and control information from a controller / processor 380 (e.g., for a physical uplink control channel (PUCCH)). The transmit processor 364 may also generate reference symbols for reference signals (e.g., for a sounding reference signal (SRS)). The symbols from the transmit processor 364 may be pre-decoded by a TX MIMO processor 366, if applicable, further processed by modulators in the transceivers 354a to 354r (e.g., for SC-FDM), and transmitted to the BS 102.

[0071] At BS 102, uplink signals from UE 104 may be received by antennas 334 a through 334 t, processed by demodulators in transceivers 332 a through 332 t, detected by MIMO detector 336 if applicable, and further processed by receive processor 338 to obtain decoded data and decoded control information transmitted by UE 104. Receive processor 338 may provide the decoded data to a data sink 339 and the decoded control information to controller / processor 340.

[0072] Memories 342 and 382 may store data and program codes for BS 102 and UE 104, respectively.

[0073] The scheduler 344 may schedule UEs to transmit data on the downlink and / or uplink.

[0074] In various aspects, BS 102 may be described as sending and receiving various types of data associated with the methods described herein. In these contexts, "sending" may refer to various mechanisms for outputting data, such as outputting data from a data source 312, a scheduler 344, a memory 342, a transmit processor 320, a controller / processor 340, a TX MIMO processor 330, transceivers 332a to 332t, antennas 334a to 334t, and / or other aspects described herein. Similarly, "receiving" may refer to various mechanisms for obtaining data, such as obtaining data from antennas 334a to 334t, transceivers 332a to 332t, RX MIMO detectors 336, controller / processor 340, receive processor 338, scheduler 344, memory 342, and / or other aspects described herein.

[0075] In various aspects, the UE 104 may also be described as sending and receiving various types of data associated with the methods described herein. In these contexts, "sending" may refer to various mechanisms for outputting data, such as outputting data from a data source 362, a memory 382, ​​a transmit processor 364, a controller / processor 380, a TX MIMO processor 366, a transceiver 354a to 354t, an antenna 352a to 352t, and / or other aspects described herein. Similarly, "receiving" may refer to various mechanisms for obtaining data, such as obtaining data from an antenna 352a to 352t, a transceiver 354a to 354t, a RX MIMO detector 356, a controller / processor 380, a receive processor 358, a memory 382, ​​and / or other aspects described herein.

[0076] In some aspects, the processor may be configured to perform various operations (such as those associated with the methods described herein) and respectively send (output) data to another interface configured to send data or receive (obtain) data from another interface configured to receive data.

[0077] Figure 4A , Figure 4B , Figure 4C and Figure 4D Describes a method for use in a wireless communication network such as Figure 1 Various aspects of the data structure of the wireless communication network 100).

[0078] Specifically, Figure 4A is a diagram 400 illustrating an example of a first subframe within a 5G (e.g., 5G NR) frame structure, Figure 4B is a diagram 430 illustrating an example of a DL channel within a 5G subframe, Figure 4C is a diagram 450 illustrating an example of a second subframe within a 5G frame structure, and Figure 4D FIG480 is a diagram illustrating an example of UL channels within a 5G subframe.

[0079] Wireless communication systems may utilize orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) on both the uplink and downlink. Such systems may also support half-duplex operation using time division duplex (TDD). OFDM and single carrier frequency division multiplexing (SC-FDM) will (for example, Figure 4B and Figure 4D The system bandwidth (as depicted in FIG. 1 ) is divided into multiple orthogonal subcarriers. Each subcarrier can be modulated with data. Modulation symbols can be transmitted in the frequency domain using OFDM and / or in the time domain using SC-FDM.

[0080] The wireless communication frame structure may be frequency division duplex (FDD), where for a particular set of subcarriers, subframes within the subcarrier set are dedicated to either DL or UL. The wireless communication frame structure may also be time division duplex (TDD), where for a particular set of subcarriers, subframes within the subcarrier set are dedicated to both DL and UL.

[0081] exist Figure 4A and Figure 4C In the wireless communication frame structure, TDD is used, where D is DL, U is UL, and X is used flexibly between DL / UL. The UE can configure the time slot format (dynamically configured by DL control information (DCI) or semi-statically / statically configured by radio resource control (RRC) signaling) through the received time slot format indicator (SFI). In the depicted example, the 10ms frame is divided into 10 equally sized 1ms subframes. Each subframe may include one or more time slots. In some examples, each time slot may include 7 or 14 symbols, depending on the time slot format. The subframe may also include micro-slots, which typically have fewer symbols than the entire time slot. Other wireless communication technologies may have different frame structures and / or different channels.

[0082] In certain aspects, the number of slots within a subframe is based on the slot configuration and parameter set. For example, for slot configuration 0, different parameter sets (μ) 0 to 5 allow for 1, 2, 4, 8, 16, and 32 slots per subframe, respectively. For slot configuration 1, different parameter sets 0 to 2 allow for 2, 4, and 8 slots per subframe, respectively. Thus, for slot configuration 0 and parameter set μ, there are 14 symbols / slot and 2μ slots / subframe. The subcarrier spacing and symbol length / duration are a function of the parameter set. The subcarrier spacing may be equal to 2 μ × 15kHz, where μ is parameter set 0 to 5. Thus, parameter set μ=0 has a subcarrier spacing of 15kHz, and parameter set μ=5 has a subcarrier spacing of 480kHz. The symbol length / duration is inversely related to the subcarrier spacing. Figure 4A , Figure 4B , Figure 4C and Figure 4D An example is provided for slot configuration 0 with 14 symbols per slot and parameter set μ=2 with 4 slots per subframe. The slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is approximately 16.67 μs.

[0083] like Figure 4A , Figure 4B , Figure 4C and Figure 4DAs depicted in , a resource grid may be used to represent a frame structure. Each time slot includes a resource block (RB) (also referred to as a physical RB (PRB)) extending, for example, over 12 consecutive subcarriers. The resource grid is divided into a plurality of resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0084] like Figure 4A As illustrated in FIG. , some of the REs carry data for UEs (eg, Figure 1 and Figure 3 The RS may include a demodulation RS (DMRS) and / or a channel state information reference signal (CSI-RS) for channel estimation at the UE. The RS may also include a beam measurement RS (BRS), a beam refinement RS (BRRS), and / or a phase tracking RS (PT-RS).

[0085] Figure 4B 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 comprising, for example, nine RE Groups (REGs), each REG comprising, for example, four consecutive REs in an OFDM symbol.

[0086] The primary synchronization signal (PSS) may be in symbol 2 of a particular subframe of a frame. The PSS is transmitted by a UE (e.g., Figure 1 and Figure 3 104) is used to determine subframe / symbol timing and physical layer identification.

[0087] The Secondary Synchronization Signal (SSS) may be within symbol 4 of a particular subframe of a frame. The SSS is used by the UE to determine the physical layer cell identity group number and radio frame timing.

[0088] Based on the physical layer identifier and the physical layer cell identifier group number, the UE can determine the physical cell identifier (PCI). Based on the PCI, the UE can determine the location of the aforementioned DMRS. 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 number of RBs in the system bandwidth and the system frame number (SFN). The physical downlink shared channel (PDSCH) carries user data, broadcast system information (such as system information blocks (SIBs)) that is not sent via the PBCH, and / or paging messages.

[0089] like Figure 4CAs illustrated in , some of the REs carry DMRS for channel estimation at the base station (indicated as R for a specific configuration, but other DMRS configurations are possible). The UE may send a DMRS for the PUCCH and a DMRS for the PUSCH. The PUSCH DMRS may be sent, for example, in the first one or two symbols of the PUSCH. The PUCCH DMRS may be sent in different configurations depending on whether a short PUCCH or a long PUCCH is sent and depending on the specific PUCCH format used. The UE 104 may send a sounding reference signal (SRS). The SRS may be sent, for example, in the last symbol of a subframe. The SRS may have a comb structure, and the UE may send the SRS on one of the teeth of the comb. The SRS may be used by the base station for channel quality estimation to achieve frequency-dependent scheduling of the UL.

[0090] Figure 4D 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 be used to carry, among other things, buffer status reports (BSRs), power headroom reports (PHRs), and / or UCI.

[0091] Example CSI Report Configuration

[0092] Channel state information (CSI) may refer to channel properties of a communication link. CSI may represent, for example, the combined effects of scattering, fading, and power attenuation with the distance between the transmitter and the receiver. Channel estimation using a pilot, such as a CSI reference signal (CSI-RS), may be performed to determine these effects on the channel. CSI may be used to adapt transmissions based on current channel conditions, which is useful for achieving reliable communications, especially with high data rates, in multi-antenna systems. CSI is typically measured at the receiver, quantized, and fed back to the transmitter.

[0093] The time and frequency resources that may be used by a user equipment (UE) to report CSI are controlled by a base station (BS) (e.g., gNB). The CSI may include a channel quality indicator (CQI), a precoding matrix indicator (PMI), a CSI-RS resource indicator (CRI), a SS / PBCH block resource indicator (SSBRI), a layer indicator (LI), a rank indicator (RI), and / or L1-RSRP. However, as described below, additional or other information may be included in the report.

[0094] The UE may be configured by the BS for CSI reporting. The BS may configure the UE for CSI reporting. For example, the BS configures the UE with a CSI reporting configuration or multiple CSI reporting configurations. The CSI reporting configuration may be provided to the UE via higher layer signaling such as radio resource control (RRC) signaling (e.g., CSI-ReportConfig). The CSI reporting configuration may be associated with a CSI-RS resource for channel measurement (CM), interference measurement (IM), or both. The CSI reporting configuration configures the CSI-RS resources (e.g., CSI-ResourceConfig) used for measurement. The CSI-RS resources provide the UE with a configuration of a CSI-RS port or a CSI-RS port group mapped to time and frequency resources (e.g., resource elements (REs)). The CSI-RS resources may be zero power (ZP) or non-zero power (NZP) resources. At least one NZP CSI-RS resource may be configured for CM.

[0095] For type II codebook, the PMI is a linear combination of beams; it has a subset of orthogonal beams to be used for linear combination, and has amplitude and phase per layer, per polarization for each beam. For any type of PMI, there can be a wideband (WB) PMI and / or a subband (SB) PMI as configured.

[0096] The CSI reporting configuration may configure the UE for aperiodic, periodic, or semi-persistent CSI reporting. For periodic CSI, the UE may be configured with periodic CSI-RS resources. Periodic CSI on the physical uplink control channel (PUCCH) may be triggered via RRC. Semi-persistent CSI reporting on the physical uplink control channel (PUCCH) may be activated via a medium access control (MAC) control element (CE). For aperiodic and semi-persistent CSI on the physical uplink shared channel (PUSCH), the BS may signal a CSI report trigger to the UE, which indicates that the UE transmits a CSI report for one or more CSI-RS resources, or configures a CSI-RS RS report trigger state (e.g., CSI-AperiodicTriggerStateList and CSI-SemiPersistentOnPUSCH-TriggerStateList). CSI report triggers for aperiodic CSI and semi-persistent CSI on PUSCH may be provided via downlink control information (DCI).

[0097] The UE may report CSI feedback (CSF) based on the CSI reporting configuration and the CSI reporting trigger. For example, the UE may measure the channel on which the triggered CSI-RS resource (associated with the CSI reporting configuration) is transmitted. Based on these measurements, the UE may select a preferred CSI-RS resource. The UE reports the CSF for the selected CSI-RS resource. The LI can be calculated conditional on the reported CQI, PMI, RI, and CRI; the CQI can be calculated conditional on the reported PMI, RI, and CRI; the PMI can be calculated conditional on the reported RI and CRI; and the RI can be calculated conditional on the reported CRI.

[0098] Each CSI reporting configuration may be associated with a single downlink (DL) bandwidth part (BWP). A CSI reporting setting configuration may define a CSI reporting band as a subset of a subband of a BWP. The associated DL BWP may be indicated by a higher layer parameter (e.g., bwp-Id) in a CSI reporting configuration for channel measurement and contains parameters for one CSI reporting band, such as codebook configuration, time domain behavior, frequency granularity of CSI, measurement restriction configuration, and CSI-related parameters to be reported by the UE. Each CSI resource setting may be located in a DLBWP identified by a higher layer parameter, and all CSI resource settings may be linked to a CSI reporting setting with the same DLBWP.

[0099] In some systems, the UE may be configured via higher layer signaling (e.g., in the CSI reporting configuration) with one of two possible subband sizes (e.g., reportFreqConfiguration contained in CSI-ReportConfig), which indicates the frequency granularity of the CSI report, where a subband may be defined as The UE may further receive an indication of the subbands for which CSI feedback is requested. In some examples, a subband mask is configured for the requested subbands for CSI reporting. The UE calculates a predecoder for each requested subband and finds a PMI that matches the calculated predecoder on each of these subbands.

[0100] Compressed CSI feedback coefficient report

[0101] As discussed above, a user equipment (UE) may be configured for channel state information (CSI) reporting, for example, by receiving a CSI configuration message from a base station. In some systems (e.g., 3GPP Release 15 5G NR), the UE may be configured to report at least a type II precoder across configured frequency domain (FD) units. For example, the precoder matrix E for layer r is rIncludes: Using spatial compression to report W for a subset of selected beams 1 matrix, and W across the configured FD units to report (for cross-polarization) the linear combination coefficients for the selected beam (2L) 2,r matrix:

[0102]

[0103] where b i is the selected beam, c i is the set of linear combination coefficients (i.e., W 2,r matrix), L is the number of selected spatial beams, and N 3 Corresponds to the number of frequency units (e.g., subbands, resource blocks (RBs), etc.). In some configurations, L is RRC-configured. The pre-decoder is based on a linear combination of digital Fourier transform (DFT) beams. Type II codebooks can improve MU-MIMO performance. In some configurations where two polarizations are considered, W 2,r The matrix has size 2L x N 3 .

[0104] In some systems (e.g., Release 16 5G NR), the UE may be configured to report FD compressed precoder feedback to reduce the overhead of CSI reporting. Figure 5 As shown, the pre-decoder matrix (W 2,i ) can use FD compression Predecoder Matrix The matrix size is compressed to 2L × M (where M is network configured and communicated via RRC or DCI in the CSI configuration message, and M <N 3 ), is given as:

[0105]

[0106] The pre-decoder matrix W i (not shown) with P = 2N 1 N 2 row (spatial domain, number of ports) and N 3 A column (a frequency domain compression unit containing an RB or reporting subband), and wherein an M basis is selected independently for each of layer 0 and layer 1. Matrix 520 includes linear combination coefficients (amplitude and phase), where each element represents the coefficient of the tap for the beam. The matrix 520 is defined by a size of 2L x M, where a row corresponds to a W of size P x ​​2L (where L is configured via the RRC network). 1(not shown), and one entry therein represents a coefficient for one tap of the spatial beam. The UE may be configured to report (e.g., CSI report) The subset K of the linear combination coefficients of the matrix 520 0 <2LM. For example, the UE may report K illustrated as a shaded square NZ,i <K 0 coefficients (K NZ,i corresponds to the maximum number of non-zero coefficients for layer i (where i=0 or 1), and K 0 is configured via the RRC network) (unreported coefficients are set to zero). In some configurations, An entry in matrix 520 corresponds to A row of matrix 530. In the example shown, at layer 0 Matrix 520 and at layer 1 Matrix 450 is both 2L XM.

[0107] Matrix 530 consists of basis vectors (each row is a basis vector) for performing compression in the frequency domain. In the example shown, Matrix 530 and at layer 1 Matrix 560 includes both 3 There are M=4 FD bases (illustrated as shaded rows) for candidate DFT bases. In some configurations, the UE may report the A subset of a selected basis of a matrix. Specifically, M bases are selected at level 0 and level 1. That is, the M bases selected at level 0 may be the same / partially overlapped / non-overlapped with the M bases selected at level 1.

[0108] Overview of CSF based on UE PMI codebook

[0109] A PMI codebook generally refers to a dictionary of PMI entries. In this way, using the PMI codebook, each PMI component from a predefined set can be mapped to a bit sequence reported by the UE. Then, a base station receiving the bit sequence (as a CSF) can obtain the corresponding PMI from the reported bit sequence.

[0110] How the UE calculates the PMI may be left to the UE implementation. However, how the UE reports the PMI should follow the format defined in the codebook, so that the UE and the base station each know how to map the PMI components to the reported bit sequence.

[0111] Figure 6is a block diagram illustrating an example of a codebook-based CSF. As illustrated, the UE may first perform channel estimation based on the CSI-RS (at 502) to estimate the channel H. The CSI calculation block 504 may generate a bit sequence a. As illustrated, the bit sequence a may be generated to find a PMI component from a predefined PMI codebook for the radio channel H or the pre-decoder W (at block 506), and the PMI component is mapped to the bit sequence a via block 508. This mapping from a set of predefined PMI components essentially acts as a form of quantization. The UE sends the bit sequence a to the BS via block 510 (e.g., in a CSI report).

[0112] like Figure 6 As illustrated in , at the BS side, the BS receives a bit sequence a reported by the UE. The BS then follows the codebook to obtain each PMI component using the reported bit sequence a, and reconstructs the actual PMI using each PMI component (obtained from the codebook) at block 512 to recover the radio channel H or pre-decoder W.

[0113] Figure 7 Various scenarios of CJT are shown. These scenarios are referred to as: Scenario 1A, where co-located TRPs / panels (intra-site) have the same orientation; and Scenario 1B, where panels have different orientations (inter-sector). Another scenario (Scenario 2) may involve distributed TRPs (inter-site).

[0114] Figure 8 An example of enhanced Type II (eType-II) CSI is shown, where for each layer, across multiple N 3 The pre-decoder of (PMI) sub-band is N t ×N 3 matrix:

[0115]

[0116] Among them, SD base W 1 (DFT basis) is N t ×2L matrix, W 1 It is shared by all layers, N t =2N 1 O 1 N 2 O 2 (Number of Tx antennas - where O 1 and O 2 Oversampling) is RRC configured, L = {2, 4, 6} (number of beams) is RRC configured, FD basis W f (DFT basis) is M×N 3 Matrix, W f is layer-specific, and M (the number of FD bases) is rank-pair specific, i.e., for rank = {1, 2}, M1 =M 2 , and for rank = {3,4}, M 3 =M 4 , M 1 or M 3 It is configured by RRC. Coefficient matrix is a 2L×M matrix and is layer specific. For each layer, the UE may report up to K 0 non-zero coefficients, among which K 0 It is RRC configured. Across all layers, the UE can report up to 2K 0 non-zero coefficients, where unreported coefficients may be set to zero.

[0117] Fig. 9 An example scenario of spatial division multiplexed (SDM-based) NCJT is shown, where data is pre-coded separately on different TRPs. Fig. 9 An example of CJT is also shown, where the data is pre-coded in a fully joint manner. According to one option, the data can be pre-coded using a separate pre-coder with co-phase and amplitude coefficients. It is also possible that the co-phase / co-amplitude is implicitly accommodated in the pre-coder (so the equations can appear indistinguishable from the NCJT case). Fig.10 The port diagrams of NCJT, the first option of CJT and the second option of CJT are also illustrated.

[0118] Aspects related to the strongest coefficient indication

[0119] Calculating the precoder used in CJT includes matrix multiplication of the SD basis matrix with the coefficient matrix and the FD basis matrix.For Type II codebook, the UE may signal the coefficient matrix to a network entity (eg, BS or TRP).

[0120] Differential quantization based on Strongest Coefficient Indication (SCI) is a technique for the UE to signal the coefficient matrix. Fig.11 Techniques for performing SCI according to aspects of the present disclosure are illustrated. The illustrated matrix 1100 is an example coefficient matrix where each coefficient is a reference power (shown at 1105), a differential amplitude p 0,0 (shown at 1110) and the phase =The product of , etc. (shown at 1115). In the first step of SCI-based differential quantization, the UE determines which coefficient in the matrix is ​​the strongest coefficient. The index of this coefficient is reported by the UE, but the coefficient is not quantized because it is set to 1 and the reference for the stronger polarization is used. In the second step, the reference power p for the weaker polarization is determined and quantized with four bits. ref, the values ​​of these bits vary from 0dB to -24dB in -1.5dB steps. In the third step, the differential amplitude of the coefficients is determined and quantized using three bits, the values ​​of these bits vary from 0dB to -24dB in -3dB steps. In the fourth step, the phase of each of the coefficients is quantized using a 16-phase shift keying (16PSK) alphabet. In the quantization After quantizing each of the non-zero coefficients (NZC) of , the UE sends the quantized value to a network entity for use by the network entity in coherent joint transmission to the UE.

[0121] Codebook Subset Restriction (CBSR) is used to avoid and / or reduce interference in certain directions of pre-coded transmissions. When CBSR is used for Release 16 enhanced type II codebook, the gNB may configure the UE with the bit sequence B=B 1 B 2 The FD average power limit for some SD bases is used. 1 Indicates 4 selected SD oversampling groups with bits (e.g., for an oversampling factor of 0 1 =4 and O 2 =4, B 1 has 11 bits). 2 represents the power limit of each spatial basis in the selected SD oversampling group and has the maximum amplitude γ for each SD basis i for both polarizations p = 0, 1 i Therefore, for 4 SD oversampling groups, each SD oversampling group has N 1 N 2 SD base, using a total of 8N 1 N 2 Units to transport B 2 . Fig.12 1 illustrates a CBSR according to aspects of the present disclosure, wherein the coefficients in the highlighted rows of the matrix 1200 are determined so as to maintain the average power in the direction of the restricted beam at less than or equal to γ i .

[0122] Fig.13 The present disclosure illustrates various aspects of the present disclosure. 2 1300. As illustrated, B 2 A value of 00 corresponds to a maximum average coefficient magnitude of 0. Similarly, B 2 A value of 01 corresponds to the maximum average coefficient magnitude B 2 A value of 10 corresponds to the maximum average coefficient magnitude And B 2 A value of 11 corresponds to a maximum average coefficient magnitude of 1.

[0123] Fig.14 The use of a typical mode 2 frequency domain joint codebook for dual beam transmission from two TRPs (TRP A and TRP B) in accordance with various aspects of the present disclosure is illustrated. As illustrated, the diagonal SD basis matrix 1405 is constructed such that the number of rows for each TRP is equal to the number of antennas for that TRP (2N 1 N 2 Equal to N t (number of antennas)), and the number of columns is equal to twice the number of beams (L). The coefficient matrix has a number of rows for each TRP equal to 2L and a number of columns equal to the number of selected FD bases (M). The FD base matrix has M rows. Therefore, a typical coefficient matrix 1410 has 2×2L rows and M columns.

[0124] In some network deployments, the TRPs transmit DL at the same power. However, for the two typical codebooks (mode 1 codebook and mode 2 codebook), each TRP performing CJT has a DL power determined by: Therefore, using such a typical codebook for CJT may not guarantee transmission from each TRP (e.g., 2 TRPs A and B) with the same power.

[0125] Although methods similar to CBSR can be used (see Fig.12 and accompanying description) to limit to achieve the same power per TRP, but in this case the performance of the pre-decoder may not be optimized.

[0126] Therefore, techniques for determining a codebook that provides improved performance while supporting constant per-TRP power are desired.

[0127] Aspects Related to Codebooks for Multiple TRPs with Same Transmit Power Per TRP

[0128] In various aspects of the present disclosure, techniques are provided for determining coefficients of a codebook for coherent joint transmission (CJT) performed by multiple transmit and receive points (TRPs) transmitting at the same transmit power per TRP.

[0129] According to aspects of the present disclosure, there is provided a method for sharing the same Codebook structure of coefficients. The coefficients can be determined based on the number (L) of selected SD bases that are configured to be the same for each TRP in the TRP.

[0130] In various aspects of the present disclosure, the SD basis selection for determining the coefficients is TRP-specific (as in general deployment scenarios other than multi-panel). That is, the SD basis selection is determined by the UE based on UE measurements for SD basis "pairing" (combination) between different TRPs.

[0131] According to aspects of the present disclosure, The matrix may have 2L rows and M columns (resulting in the NZC selection bitmap having a size of 2LM), where L is the number of beams and M is the number of selected FD bases. This size is similar to a typical Matrix (referenced above Fig.14 discussed).

[0132] In various aspects of the present disclosure, the 2LM TRP common coefficients may be associated with two polarizations, half each. That is, the first half of the coefficients may be associated with the first polarization of at least two TRPs, and the second half of the coefficients may be associated with the second polarization of at least two TRPs.

[0133] Fig.15A The use of a new frequency domain joint codebook for dual beam transmission from two TRPs (TRP A and TRP B) in accordance with various aspects of the present disclosure is illustrated. As illustrated, the SD base matrix 1505 is constructed such that the number of rows for each TRP is equal to the number of antennas for that TRP (2N 1 N 2 Equal to N t (number of antenna ports)), and the number of columns is equal to twice the number of beams (L). The rows of TRP A include a row for each of polarity pol 0 and pol 1. Similarly, the rows of TRP B also include a row for pol 0 and another row for pol 1. The rows of the TRPs are staggered, with the rows of TRP A for pol 0 located above and adjacent to the rows of TRP B for pol 0, and the rows of TRP A for pol 1 located above and adjacent to the rows of TRP B for pol 1. It can be noted that, as with the reference above, Fig.14 Compared to the illustrated SD basis matrix 1405, the SD basis matrix is ​​a non-diagonal matrix. The coefficient matrix 1510 has a number of rows equal to 2L and a number of columns equal to the number of selected FD bases (M). The FD basis matrix has M rows. Therefore, according to aspects of the present disclosure, the coefficient matrix has 2L rows and M columns.

[0134] Fig. 15B The use of another new frequency domain joint codebook for dual beam transmission from two TRPs (TRP A and TRP B) in accordance with various aspects of the present disclosure is illustrated. As illustrated, the SD base matrix 1555 is constructed such that the number of rows for each TRP is equal to the number of antennas (2N 1 N 2 Equal to N t(number of antennas)), and the number of columns is equal to twice the number of beams (L). The rows of TRP A include a row for each of polarities pol 0 and pol 1. Similarly, the rows of TRP B also include a row for pol 0 and another row for pol 1. The rows of TRPs are not staggered. Instead, all rows of TRP A are located above all rows of TRP B. It can be noted that, as with the reference above, Fig.14 Compared to the illustrated SD basis matrix 1405, the SD basis matrix is ​​a non-diagonal matrix. The coefficient matrix 1560 has a number of rows equal to 2L and a number of columns equal to the number of selected FD bases (M). The FD basis matrix has M rows. Therefore, according to aspects of the present disclosure, the coefficient matrix has 2L rows and M columns.

[0135] In order to report to the network entity Fig.15A and Fig. 15B The coefficients of the coefficient matrix 1510 or 1560 shown in FIG. 15, the UE may refer to FIG. Fig.11 The various coefficients are quantized as described, and a report including the quantized values ​​is sent.

[0136] In various aspects of the present disclosure, the codebook formula is illustrated using the 2-TRP case as an example.

[0137] When calculating the codebook for 2-TRP CJT transmission, the relevant equation can be expressed as:

[0138] Among them, SD base selection and Can be performed independently for 2 TRPs.

[0139] For the SD oversampling group (0, ..., O 1 O 2 -1) Selection or oversampling of basis selection within a group, the correlation selection can be TRP specific.

[0140] For selecting SD basis in a scenario involving N TRPs, the search space may have a total of at most combinations, but a lower complexity selection algorithm is provided in the present disclosure.

[0141] In various aspects of the present disclosure, a heuristic algorithm with lower complexity may be: 1.) for each TRP, find the oversampled group with the maximum power, and find the L maximum power SD bases within each corresponding oversampled group; and 2.) pair each of the L SD bases for the first TRP in descending order of power with one of the L SD bases for the second TRP in descending order of power. That is, [b 0,A ,…,b L-1,A ] and [b 0,B,…,b L-1,B ]The two are arranged in order from high to low power after SD compression.

[0142] According to aspects of the present disclosure, due to the fully shared coefficients, the described codebook structure may only support Mode 2 FD joint codebook. The disclosed technology may not support TRP specific FD basis selection, and therefore may not support Mode 1 FD independent codebook.

[0143] In various aspects of the present disclosure, as with a typical codebook, a UE reporting matrix coefficients may report two reference amplitudes for two polarizations, rather than a TRP-specific reference amplitude for each amplitude in a 2N-1 amplitude group for a TRP (e.g., 2N-1 reference amplitudes for N TRP scenarios).

[0144] According to various aspects of the present disclosure, the UE may not report the N TRP The selection of N CSI-RS resources out of the CSI-RS resources is performed as the UE does when using a typical codebook.

[0145] In various aspects of the present disclosure, powerControlOffset (Pc ratio, which is configured with NZP CSI-RS resources) may be defined as in

[0146] P PDSCH is the energy of all PDSCH ports multiplexed on one subcarrier of one OFDM symbol, and

[0147] P CSIRS It is the energy of all CSI-RS ports multiplexed on one subcarrier of one OFDM symbol.

[0148] According to aspects of the present disclosure, when each TRP transmits at the same power according to the configured Pc ratio using, for example, a codebook as described herein or a typical Mode 1 or Mode 2 CB with a per-TRP power limit similar to CBSR, the total energy of the PDSCH port is the Pc-weighted sum of the energies of all ports of all N CSI-RS resources (i.e., N TRPs, since one TRP is associated with one CSI-RS resource). This relationship is illustrated by the following equation:

[0149]

[0150] In the above equation, the parameter P PDSCH 、Pc n and P CSIRS#n All represent linear domain values ​​and are therefore not measured in dB. For CJT, all PDSCH ports are associated with all TRPs.

[0151] In various aspects of the present disclosure, when the UE derives the PMI, the SD basis vectors (W 1 ) should be scaled according to the Pc ratio per CSIRS (i.e. per TRP), or the coefficient matrix They should be normalized according to the same Pc ratio. For example, each of the other N-1 TRPs (e.g., TRP B, etc.) can be normalized by the factor is scaled to align with a certain TRPA. Therefore, for the codebook described in this disclosure, the SD basis vectors can be scaled as shown in the equation:

[0152]

[0153] For a typical mode 2FD joint codebook, the coefficient matrix can be normalized as shown in the equation:

[0154]

[0155] in and have the same total power. For example, and Can be affected by CBSR-like mechanisms at each TRP level.

[0156] Example Operation of User Equipment

[0157] Fig.16 It is shown that a UE (such as Figure 1 and Figure 3 An example of a method 1600 for performing wireless communications with a UE 104).

[0158] Method 1600 begins at step 1605, receiving configuration information indicating resources associated with at least two TRPs, and the UE is configured to communicate with the at least two TRPs using a codebook structure having a coefficient matrix shared between the at least two TRPs. In some cases, the operation of this step refers to as described in reference Fig.18 The described circuits for receiving and / or codes for receiving may be or may be executed by the circuits and / or codes.

[0159] Method 1600 then proceeds to step 1610, measuring CSI-RS from at least two TRPs according to the configuration information. In some cases, the operation of this step refers to the operation of Fig.18 The described circuits for measuring and / or the code for measuring, or can be executed by the circuits and / or the code.

[0160] Method 1600 then proceeds to step 1615, sending a report having coefficients for a coefficient matrix shared between at least two TRPs. In some cases, the operation of this step refers to the operation of Fig.18 The described circuits for transmitting and / or codes for transmitting, or executable by the circuits and / or the codes.

[0161] In some aspects, the codebook structure is based on: a SD basis matrix and a FD basis matrix.

[0162] In some aspects, a first dimension of the coefficient matrix is ​​twice the number of selected SD bases (L), where the number of selected SD bases is common to each TRP of at least two TRPs; and a second dimension of the coefficient matrix is ​​the number of selected FD bases (M).

[0163] In some aspects, method 1600 further includes pairing each of the L first SD bases for a first TRP of the at least two TRPs with one of the L second SD bases for a second TRP of the at least two TRPs to form L pairs of the first SD base and the second SD base. In some cases, the operation of this step refers to the method described in reference to Fig.18 The described circuit for pairing and / or code for pairing, or may be executed by the circuit and / or the code.

[0164] In some aspects, method 1600 further comprises reporting L pairs of the first SD base and the second SD base. In some cases, the operation of this step refers to the Fig.18 The described circuit for reporting and / or code for reporting, or executable by the circuit and / or code.

[0165] In some aspects, the method 1600 further includes selecting L first SD bases having the maximum power of the CSI-RS from the first TRP. In some cases, the operation of this step refers to the same as in reference Fig.18 The circuit for selecting and / or the code for selecting are described, or can be executed by the circuit and / or the code.

[0166] In some aspects, the method 1600 further includes selecting L second SD bases having the maximum power of the CSI-RS from the second TRP, wherein the pairing of the first SD base with the second SD base is performed in descending order of the power of the CSI-RS from the first SD base and the power of the CSI-RS from the second SD base. In some cases, the operation of this step refers to the operation of Fig.18 The circuit for selecting and / or the code for selecting are described, or can be executed by the circuit and / or the code.

[0167] In some aspects, method 1600 further comprises constructing an SD basis matrix from L pairs of the first SD basis and the second SD basis. In some cases, the operation of this step refers to the operation of Fig.18 The described circuits for constructing and / or codes for constructing, or can be executed by the circuits and / or the codes.

[0168] In some aspects, method 1600 further includes determining coefficients based on the SD basis matrix. In some cases, the operation of this step refers to the operation described in reference to Fig.18 The described circuits for determining and / or the code for determining, or may be executed by the circuits and / or the code.

[0169] In some aspects, a first half of the coefficients are associated with a first polarization of at least two TRPs, and a second half of the coefficients are associated with a second polarization of at least two TRPs.

[0170] In some aspects, the coefficients are determined based on a non-diagonal SD basis matrix.

[0171] In some aspects, method 1600 further includes determining coefficients based on an SD basis matrix, the SD basis matrix including at least one of: a plurality of first rows of SD basis corresponding to a plurality of polarizations for a first TRP of at least two TRPs and an additional plurality of second rows of SD basis for the same plurality of polarizations for a second TRP of at least two TRPs, each of the first rows being located above and adjacent to a corresponding second row of the SD basis for the same polarization; or a plurality of first rows of SD basis corresponding to a plurality of polarizations for a first TRP of at least two TRPs being located above an additional plurality of second rows of SD basis for the same plurality of polarizations for the second TRP. In some cases, the operation of this step refers to as described in reference to Fig.18 The described circuits for determining and / or the code for determining, or may be executed by the circuits and / or the code.

[0172] In some aspects, method 1600 further comprises reporting two reference amplitudes for the indicated resource. In some cases, the operation of this step refers to Fig.18 The described circuit for reporting and / or code for reporting, or executable by the circuit and / or code.

[0173] In some aspects, the SD base matrix is ​​scaled according to a per-TRP power offset (Pc) ratio of the power of the associated PDSCH to the power of the CSI-RS from a TRP in at least two TRPs.

[0174] In one aspect, method 1600 or any aspect related thereto may be performed by an apparatus such as Fig.18The method 1600 is performed by a communication device 1800 that includes various components operable, configured, or adapted to perform the method 1600. The communication device 1800 is described in more detail below.

[0175] It should be noted that Fig.16 This is merely one example of a method, and other methods including fewer, additional, or alternative steps are also possible consistent with the present disclosure.

[0176] Example Operations of Network Entities

[0177] Fig.17 shows the network entities such as Figure 1 and Figure 3 BS102 or such Figure 2 An example of a method 1700 for performing wireless communications using a decomposed base station) as discussed above.

[0178] Method 1700 begins at step 1705, sending configuration information indicating resources associated with at least two TRPs, and the UE is configured to communicate with the at least two TRPs using a codebook structure having a coefficient matrix shared between the at least two TRPs. In some cases, the operation of this step refers to as described in reference Fig.18 The described circuits for transmitting and / or codes for transmitting, or executable by the circuits and / or the codes.

[0179] Method 1700 then proceeds to step 1710, receiving a report having coefficients for a coefficient matrix shared between at least two TRPs. In some cases, the operation of this step refers to the operation of Fig.18 The described circuits for receiving and / or codes for receiving may be or may be executed by the circuits and / or codes.

[0180] In some aspects, the codebook structure is based on: a SD basis matrix and a FD basis matrix.

[0181] In some aspects, a first dimension of the coefficient matrix is ​​twice the number of selected SD bases (L), where the number of selected SD bases is common to each TRP of at least two TRPs; and a second dimension of the coefficient matrix is ​​the number of selected FD bases (M).

[0182] In some aspects, a first half of the coefficients are associated with a first polarization of at least two TRPs, and a second half of the coefficients are associated with a second polarization of at least two TRPs.

[0183] In some aspects, the coefficients are determined based on a non-diagonal SD basis matrix.

[0184] In some aspects, the report includes two reference magnitudes for the indicated resources.

[0185] In some aspects, the SD base matrix is ​​scaled according to a per-TRP power offset (Pc) ratio of the power of the associated PDSCH to the power of the CSI-RS from a TRP in at least two TRPs.

[0186] In one aspect, method 1700 or any aspect related thereto may be performed by an apparatus such as Fig.18 The method 1700 is performed by a communication device 1800 that includes various components operable, configured, or adapted to perform the method 1700. The communication device 1800 is described in more detail below.

[0187] It should be noted that Fig.17 This is merely one example of a method, and other methods including fewer, additional, or alternative steps are also possible consistent with the present disclosure.

[0188] Example Communication Device

[0189] Fig.18 Depicted are aspects of an example communication device 1800. In some aspects, the communication device 1800 is a user equipment, such as described above with respect to Figure 1 and Figure 3 UE 104 is described. In some aspects, the communication device 1800 is a network entity such as Figure 1 and Figure 3 BS102 or such Figure 2 The decomposed base station in question.

[0190] The communication device 1800 includes a processing system 1805 coupled to a transceiver 1890 (e.g., a transmitter and / or a receiver). In some aspects (e.g., when the communication device 1800 is a network entity), the processing system 1805 can be coupled to a network interface 1894 that is configured to communicate with the communication device 1800 via a communication link (such as, for example, as described herein with respect to Figure 2 The processing system 1805 may be configured to perform processing functions of the communication device 1800, including processing signals received and / or to be transmitted by the communication device 1800.

[0191] The processing system 1805 includes one or more processors 1810. In various aspects, such as with respect to Figure 3 As depicted, the one or more processors 1810 may represent one or more of the receive processor 358, the transmit processor 364, the TX MIMO processor 366, and / or the controller / processor 380. In various aspects, as described with respect to Figure 3 As described, the one or more processors 1810 may represent one or more of the receive processor 338, the transmit processor 320, the TX MIMO processor 330, and / or the controller / processor 340. The one or more processors 1810 are coupled to the computer-readable medium / memory 1855 via the bus 1888. In certain aspects, the computer-readable medium / memory 1855 is configured to store instructions (e.g., computer-executable code) that, when executed by the one or more processors 1810, cause the one or more processors 1810 to perform operations related to the processing of the computer-readable medium / memory 1855. Fig.16 The method 1600 described herein or any aspect thereof; and Fig.17 The described method 1700 or any aspect related thereto. It should be noted that references to a processor performing a function of the communication device 1800 may include one or more processors 1810 performing that function of the communication device 1800.

[0192] In the depicted example, computer readable medium / memory 1855 stores code (e.g., executable instructions), such as code 1860 for receiving, code 1865 for measuring, code 1870 for sending, code 1875 for pairing, code 1880 for reporting, code 1882 for selecting, code 1884 for building, and code 1886 for determining. Processing of code 1860 for receiving, code 1865 for measuring, code 1870 for sending, code 1875 for pairing, code 1880 for reporting, code 1882 for selecting, code 1884 for building, and code 1886 for determining may cause the communication device 1800 to perform operations related to Fig.16 The method 1600 described herein or any aspect thereof; and Fig.17 The described method 1700 or any aspect related thereto.

[0193] The one or more processors 1810 include circuits configured to implement (e.g., execute) code stored in the computer-readable medium / memory 1855, including circuits for receiving 1815, circuits for measuring 1820, circuits for transmitting 1825, circuits for pairing 1830, circuits for reporting 1835, circuits for selecting 1840, circuits for building 1845, and circuits for determining 1850. Processing using the circuits for receiving 1815, the circuits for measuring 1820, the circuits for transmitting 1825, the circuits for pairing 1830, the circuits for reporting 1835, the circuits for selecting 1840, the circuits for building 1845, and the circuits for determining 1850 may enable the communication device 1800 to perform operations related to Fig.16The method 1600 described herein or any aspect thereof; and Fig.17 The described method 1700 or any aspect related thereto.

[0194] The various components of the communication device 1800 may provide means for performing the following: Fig.16 The method 1600 described herein or any aspect thereof; and Fig.17 The method 1700 described herein or any aspect related thereto. For example, a component for sending, transmitting, or outputting for sending may include Figure 3 The illustrated transceiver 354 and / or antenna 352 of the UE 104, Figure 3 The illustrated transceiver 332 and / or antenna 334 and / or Fig.18 The illustrated communication device 1800 includes a transceiver 1890 and an antenna 1888. The components for receiving or obtaining may include Figure 3 The illustrated transceiver 354 and / or antenna 352 of the UE 104, Figure 3 The illustrated transceiver 332 and / or antenna 334 and / or Fig.18 The transceiver 1890 and antenna 1888 of the communication device 1800 are illustrated.

[0195] Sample Clauses

[0196] Specific implementation examples are described in the following numbered clauses:

[0197] Clause 1: A method for wireless communication by a UE, the method comprising: receiving configuration information indicating resources associated with at least two TRPs, the UE being configured to communicate with the at least two TRPs using a codebook structure having a coefficient matrix shared between the at least two TRPs; measuring CSI-RS from the at least two TRPs based on the configuration information; and sending a report having coefficients for the coefficient matrix shared between the at least two TRPs.

[0198] Clause 2: The method of clause 1, wherein the codebook structure is based on: an SD basis matrix; and an FD basis matrix.

[0199] Clause 3: A method according to Clause 2, wherein: the first dimension of the coefficient matrix is ​​twice the number of selected SD bases (L), wherein the number of selected SD bases is common to each TRP of the at least two TRPs; and the second dimension of the coefficient matrix is ​​the number of selected FD bases (M).

[0200] Item 4: The method according to Item 3 further includes: pairing each of the L first SD bases used for the first TRP of the at least two TRPs with one of the L second SD bases used for the second TRP of the at least two TRPs to form L pairs of the first SD base and the second SD base; and reporting the L pairs of the first SD base and the second SD base.

[0201] Clause 5: The method according to Clause 4 further includes: selecting the L first SD bases having the maximum power of the CSI-RS from the first TRP; selecting the L second SD bases having the maximum power of the CSI-RS from the second TRP, wherein the pairing of the first SD base with the second SD base is performed in descending order of the power of the CSI-RS from the first SD base and the power of the CSI-RS from the second SD base; constructing an SD base matrix from the L pairs of the first SD base and the second SD base; and determining the coefficients based on the SD base matrix.

[0202] Clause 6: A method according to clause 2, wherein a first half of the coefficients are associated with a first polarization of the at least two TRPs and a second half of the coefficients are associated with a second polarization of the at least two TRPs.

[0203] Clause 7: The method of clause 2, wherein the coefficients are determined based on a non-diagonal SD basis matrix.

[0204] Clause 8: The method according to Clause 2 further includes: determining the coefficients based on an SD basis matrix, the SD basis matrix comprising at least one of the following: a plurality of first rows of SD basis corresponding to a plurality of polarizations for a first TRP of the at least two TRPs and an additional plurality of second rows of the SD basis for the same plurality of polarizations for a second TRP of the at least two TRPs, each of the first rows being located above and adjacent to a corresponding second row of the SD basis for the same polarization; or the plurality of first rows of the SD basis corresponding to the plurality of polarizations for the first TRP of the at least two TRPs being located above the additional plurality of second rows of the SD basis for the same plurality of polarizations for the second TRP.

[0205] Clause 9: The method of clause 2, further comprising: reporting two reference magnitudes for the indicated resources.

[0206] Clause 10: A method according to clause 2, wherein the SD base matrix is ​​scaled according to a per-TRP power offset (Pc) ratio of the power of the associated PDSCH to the power of the CSI-RS from a TRP of the at least two TRPs.

[0207] Clause 11: A method for wireless communication by a network entity, the method comprising: sending configuration information indicating resources associated with at least two TRPs, the UE being configured to communicate with the at least two TRPs using a codebook structure having a coefficient matrix shared between the at least two TRPs; and receiving a report having coefficients for the coefficient matrix shared between the at least two TRPs.

[0208] Clause 12: The method of clause 11, wherein the codebook structure is based on: a SD basis matrix; and a FD basis matrix.

[0209] Clause 13: A method according to clause 12, wherein: the first dimension of the coefficient matrix is ​​twice the number of selected SD bases (L), wherein the number of selected SD bases is common to each TRP of the at least two TRPs; and the second dimension of the coefficient matrix is ​​the number of selected FD bases (M).

[0210] Clause 14: A method according to clause 12, wherein a first half of the coefficients are associated with a first polarization of the at least two TRPs and a second half of the coefficients are associated with a second polarization of the at least two TRPs.

[0211] Clause 15: The method of clause 12, wherein the coefficients are determined based on a non-diagonal SD basis matrix.

[0212] Clause 16: The method of clause 12, wherein the report comprises two reference magnitudes for the indicated resources.

[0213] Clause 17: A method according to clause 12, wherein the SD base matrix is ​​scaled according to a per-TRP power offset (Pc) ratio of the power of the associated PDSCH to the power of the CSI-RS from a TRP of the at least two TRPs.

[0214] Clause 18: An apparatus comprising: a memory including executable instructions; and a processor configured to execute the executable instructions and cause the apparatus to perform the method according to any one of clauses 1 to 17.

[0215] Clause 19: An apparatus comprising means for performing the method according to any one of clauses 1 to 17.

[0216] Clause 20: A non-transitory computer readable medium comprising executable instructions which, when executed by a processor of an apparatus, cause the apparatus to perform the method of any one of clauses 1 to 17.

[0217] Clause 21: A computer program product embodied on a computer readable storage medium, the computer readable storage medium comprising code for performing the method according to any of clauses 1 to 17.

[0218] Additional considerations

[0219] The foregoing description is provided to enable any person skilled in the art to practice the various aspects described herein. The examples discussed herein are not limited to the scope, applicability or aspects set forth in the claims. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects. For example, without departing from the scope of the present disclosure, the functions and arrangements of the elements discussed may be changed. Various examples may omit, replace or add various procedures or components as appropriate. For example, the described methods may be performed in an order different from the order described, and various actions may be added, omitted or combined. In addition, the features described for some examples may be combined in some other examples. For example, any number of aspects set forth herein may be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover such devices or methods practiced using other structures, functionality or structures and functionality that are supplementary or alternative to the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of the present claims.

[0220] The various illustrative logical blocks, modules, and circuits described in conjunction with the present disclosure may be implemented or performed using a general purpose processor, a digital signal processor (DSP), an ASIC, a field programmable gate array (FPGA) or other programmable logic device (PLD), discrete gate or transistor logic components, discrete hardware components, or any combination thereof, designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any commercially available processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, a system on a chip (SoC), or any other such configuration.

[0221] As used herein, a phrase referring to "at least one of" a list of items refers to any combination of those items (including single members). For example, "at least one of a, b, or c" is intended to cover a, b, c, ab, ac, bc, and abc, as well as any combination with multiple identical elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other ordering of a, b, and c).

[0222] As used herein, the term "determining" encompasses a wide variety of actions. For example, "determining" may include calculating, computing, processing, deriving, investigating, searching (e.g., searching in a table, a database, or another data structure), ascertaining, and the like. Moreover, "determining" may include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory), and the like. In addition, "determining" may include resolving, selecting, choosing, establishing, and the like.

[0223] The method disclosed herein includes one or more actions for implementing the method. The method actions are interchangeable with each other without departing from the scope of the claims. In other words, unless a specific order of actions is specified, the order and / or use of specific actions may be modified without departing from the scope of the claims. In addition, the various operations of the method described above may be performed by any appropriate component capable of performing the corresponding function. The component may include various hardware and / or software components and / or modules, including but not limited to circuits, application specific integrated circuits (ASICs) or processors.

[0224] The following claims are not intended to be limited to the various aspects shown herein, but should be given the full scope consistent with the language of the claims. Within the claims, unless otherwise specified, reference to an element in the singular form is not intended to mean "one and only one", but "one or more". Unless otherwise specified, the term "some" refers to one or more. Any claim element is not interpreted according to the provisions of 35 U.S.C. § 112 (f) unless the element is explicitly stated using the phrase "parts for...". All structural and functional equivalents of the elements of the various aspects described throughout this disclosure that are known or will be known later 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 explicitly stated in the claims.

Claims

1. A method for wireless communication by a user equipment (UE), the method include: receiving configuration information indicating resources associated with at least two transmit reception points (TRPs), the UE being configured to communicate with the at least two TRPs using a codebook structure having a coefficient matrix shared between the at least two TRPs; measuring a channel state information (CSI) reference signal (CSI-RS) from the at least two TRPs according to the configuration information; as well as Sending a report having coefficients of the coefficient matrix for sharing between the at least two TRPs.

2. The method according to claim 1, wherein the codebook structure is based on: spatial domain (SD) basis matrix; and Frequency domain (FD) basis matrix.

3. The method according to claim 2, in: A first dimension of the coefficient matrix is ​​twice the number (L) of selected spatial domain (SD) bases, wherein the number of selected SD bases is common to each of the at least two TRPs; and The second dimension of the coefficient matrix is ​​the number (M) of selected frequency domain (FD) bases.

4. The method according to claim 3, further comprising: include: pairing each of L first SD radicals for a first TRP of the at least two TRPs with one of L second SD radicals for a second TRP of the at least two TRPs to form L pairs of the first SD radical and the second SD radical; and The L pairs of the first SD base and the second SD base are reported.

5. The method according to claim 4, further comprising: include: selecting the L first SD bases having the maximum power of the CSI-RS from the first TRP; selecting the L second SD bases having the maximum power of the CSI-RS from the second TRP, wherein the pairing of the first SD base with the second SD base is performed in descending order of the power of the CSI-RS from the first SD base and the power of the CSI-RS from the second SD base; constructing an SD basis matrix from the L pairs of the first SD basis and the second SD basis; and The coefficients are determined based on the SD basis matrix.

6. The method of claim 2, wherein a first half of the coefficients are associated with a first polarization of the at least two TRPs, and a second half of the coefficients are associated with a second polarization of the at least two TRPs.

7. The method of claim 2, wherein the coefficients are determined based on a non-diagonal spatial domain (SD) basis matrix.

8. The method of claim 2, further comprising determining the coefficients based on a spatial domain (SD) basis matrix, the spatial domain (SD) basis matrix comprising at least one of the following: a plurality of first rows of SD basis corresponding to a plurality of polarizations for a first TRP of the at least two TRPs and another plurality of second rows of the SD basis of the same plurality of polarizations for a second TRP of the at least two TRPs, each of the first rows being located above and adjacent to a corresponding second row of SD basis of the same polarization; or The plurality of first rows of the SD bases corresponding to the plurality of polarizations for the first TRP of the at least two TRPs are located above the additional plurality of second rows of the SD bases for the same plurality of polarizations for the second TRP.

9. The method according to claim 2, further comprising: include: Two reference magnitudes are reported for the indicated resource.

10. The method of claim 2, wherein the SD base matrix is ​​scaled according to a per-TRP power offset (Pc) ratio of the power of an associated physical downlink shared channel (PDSCH) to the power of the CSI-RS from a TRP among the at least two TRPs.

11. A method for wireless communication by a network entity, the method include: transmitting configuration information indicating resources associated with at least two transmit reception points (TRPs), a user equipment (UE) being configured to communicate with the at least two TRPs using a codebook structure having a coefficient matrix shared between the at least two TRPs; as well as Receive a report having coefficients for the coefficient matrix shared between the at least two TRPs.

12. The method of claim 11, wherein the codebook structure is based on: spatial domain (SD) basis matrix; and Frequency domain (FD) basis matrix.

13. The method according to claim 12, in: A first dimension of the coefficient matrix is ​​twice the number (L) of selected spatial domain (SD) bases, wherein the number of selected SD bases is common to each of the at least two TRPs; and The second dimension of the coefficient matrix is ​​the number (M) of selected frequency domain (FD) bases.

14. The method of claim 12, wherein a first half of the coefficients are associated with a first polarization of the at least two TRPs, and a second half of the coefficients are associated with a second polarization of the at least two TRPs.

15. The method of claim 12, wherein the coefficients are determined based on a non-diagonal spatial domain (SD) basis matrix.

16. The method of claim 12, wherein the report includes two reference magnitudes for the indicated resources.

17. A method according to claim 12, wherein the SD base matrix is ​​scaled according to a per-TRP power offset (Pc) ratio of the power of the associated physical downlink shared channel (PDSCH) to the power of the CSI-RS from a TRP in the at least two TRPs.

18. A device, wherein the device include: a memory including executable instructions; and a processor configured to execute the executable instructions and cause the apparatus to perform the method according to any one of claims 1 to 17.

19. An apparatus comprising means for performing the method according to any one of claims 1 to 17.

20. A non-transitory computer readable medium comprising executable instructions which, when executed by a processor of a device, cause the device to perform the method of any one of claims 1 to 17.

21. A computer program product embodied on a computer-readable storage medium, the computer-readable storage medium comprising code for executing the method according to any one of claims 1 to 17.

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