CN117639868A - Wireless communication method and device - Google Patents

Abstract

In one aspect of the invention, a method, computer-readable medium, and apparatus are provided. The apparatus may be a UE. The UE sends a capability report to the base station. The capability report indicates one or more capabilities of the aggregated MT formed by the UE and one or more devices, each as a component device. The UE receives a configuration of an initial reference signal set from a base station. The configuration responds to one or more capabilities. The UE sends an initial report to the base station. The initial report indicates codebook parameters. The UE receives a codebook configuration of a codebook from a base station. The codebook is used to generate a downlink precoder matrix for CSI reporting or to generate an uplink precoder matrix for uplink transmission.

Description

Wireless communication method and device

Technical Field

The present invention relates generally to communication systems and, more particularly, to techniques to determine a codebook for a distributed multiple-input multiple-output (MIMO) transmitter/receiver.

Background

The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcast. A typical wireless communication system may employ multiple-access (multiple-access) techniques that are capable of supporting communication with multiple users by sharing the available system resources. Examples of such multiple-access techniques include code division multiple access (Code Division Multiple Access, CDMA) systems, time division multiple access (time division multiple access, TDMA) systems, frequency division multiple access (frequency division multiple access, FDMA) systems, orthogonal frequency division multiple access (Orthogonal Frequency Division Multiple Access, OFDMA) systems, single-carrier frequency division multiple access (single-carrier frequency division multiple access, SC-FDMA) systems, and time division synchronous code division multiple access (time division synchronous code division multiple access, TD-SCDMA) systems.

These multiple access techniques have been applied in various telecommunications standards to provide a generic protocol that enables different wireless devices to communicate at the city level, country level, regional level, and even the global level. One example telecommunications standard is the fifth generation (5G) New Radio (NR). The 5G NR is part of the evolution of continuous mobile broadband promulgated by the third generation partnership project (Third Generation Partnership Project,3 GPP) and can meet new demands related to latency, reliability, security, scalability (e.g., with the internet of things (Internet of things, ioT)), and others. Some aspects of 5G NR may be based on the fourth generation (4th Generation,4G) long term evolution (long term evolution, LTE) standard. Further improvements are needed for the 5G NR technology. These improvements may also be applicable to other multiple access techniques and telecommunication standards employing these techniques.

Disclosure of Invention

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

In one aspect of the invention, a method, computer-readable medium, and apparatus are provided. The apparatus may be a User Equipment (UE). The UE sends a capability report to the base station. The capability report indicates one or more capabilities of an aggregated Mobile Terminal (MT) formed by the UE and one or more devices, each as a component device. The UE receives a configuration of an initial reference signal set from a base station. The configuration responds to one or more capabilities. The UE sends an initial report to the base station. The initial report indicates codebook parameters. The UE receives a codebook configuration of a codebook from a base station. The codebook is used to generate a downlink precoder matrix for CSI reporting or to generate an uplink precoder matrix for uplink transmission.

In another aspect of the invention, a method, computer-readable medium, and apparatus are provided. The apparatus may be a base station. The base station receives the capability report from the UE. The capability report indicates one or more capabilities of the aggregated MT. The aggregate MT is formed by the UE and one or more repeaters, each repeater being a component MT. The base station configures an initial set of reference signals for the UE based on the one or more capabilities. The base station transmits an initial reference signal set to the UE. The base station receives an initial report from the UE. The initial report indicates codebook parameters. The base station determines a codebook. The codebook is initialized or updated according to the codebook parameters. The base station configures a codebook for the UE.

To the accomplishment of the foregoing and related ends, the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The detailed description and the figures describe certain illustrative features of one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed and the description is intended to include all such aspects and their equivalents.

Drawings

Fig. 1 is a schematic diagram illustrating an example of a wireless communication system and an access network.

Fig. 2 is a schematic diagram illustrating a base station communicating with a UE in an access network.

Fig. 3 illustrates an example logical structure of a distributed access network.

Fig. 4 illustrates an example physical structure of a distributed access network.

Fig. 5 is a diagram showing an example of a Downlink (DL) -centered subframe.

Fig. 6 is a diagram showing an example of an Uplink (UL) -centered subframe.

Fig. 7 is a schematic diagram illustrating distributed MIMO transmission.

Fig. 8 is a flow chart 800 of a method (process) for configuring a codebook in the downlink direction for a distributed MIMO transmitter/receiver.

Fig. 9 is a flow chart 900 of a method (procedure) for configuring a codebook in the uplink direction for a distributed MIMO transmitter/receiver.

Fig. 10 is a schematic diagram depicting an example of a hardware implementation for an apparatus employing a processing system.

Detailed Description

The embodiments set forth below in connection with the figures are intended as descriptions of various configurations and are not intended to represent the only configurations in which the concepts described herein may be implemented. The present embodiments include specific details for the purpose of providing a thorough understanding of the various concepts. However, it will be apparent to one skilled in the art that the concepts may be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form in order to avoid obscuring such concepts.

Several aspects of the telecommunications system will now be presented with reference to various apparatus and methods. These apparatuses and methods will be described in the following embodiments and are illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (hereinafter collectively referred to as "elements"). These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

By way of example, an element, or any portion of an element, or any combination of elements, may be implemented as a "processing system" comprising one or more processors. Examples of processors include microprocessors, microcontrollers, graphics processing units (graphics processing unit, GPU), central processing units (central processing unit, CPU), application processors, digital signal processors (digital signal processor, DSP), reduced instruction set computing (reduced instruction set computing, RISC) processors, systems on a chip (systems on a chip, soC), baseband processors, field programmable gate arrays (field programmable gate array, FPGA), programmable logic devices (programmable logic device, PLD), state machines, gating logic, discrete hardware circuits, and other suitable hardware configured to perform the various functions of all aspects of the invention. One or more processors in a processing system may execute software. Software should be construed broadly as instructions, instruction sets, code segments, program code, programs, subroutines, software components, applications, software packages, routines, subroutines, objects, executable files, threads of execution, programs, functions, etc., whether referred to as software, firmware, intermedial software, microcode, hardware description language, or otherwise.

Thus, in one or more example embodiments, the functions described may be implemented in hardware, software, or any combination thereof. If implemented in software, these functions may be stored on or encoded as one or more instructions or code on a computer-readable medium. Computer readable media includes computer storage media. A storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, computer readable media can comprise random-access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (electrically erasable programmable ROM), optical disk storage, magnetic disk storage, other magnetic storage devices, and combinations of the above computer readable media types, or any other media that can be used to store computer executable code in the form of computer accessible instructions or data structures.

Fig. 1 is a schematic diagram illustrating an example of a wireless communication system and an access network 100. A wireless communication system, which may also be referred to as a wireless wide area network (wireless wide area network, WWAN), includes a base station 102, a UE 104, and an evolved packet core (Evolved Packet Core, EPC) 160, and another core network 190 (e.g., a 5G core (5G c)). The base station 102 includes a macro cell (macro cell) (high power cell base station) and/or a small cell (small cell) (low power cell base station). The macrocell includes a base station. Small cells include femto cells (femtocells), pico cells (picocells), and micro cells (microcells).

A base station 102 configured for 4G LTE, collectively referred to as an evolved universal mobile telecommunications system (Evolved Universal Mobile Telecommunications System, UMTS) terrestrial radio access network (UMTS terrestrial radio access network, E-UTRAN), is connected to the EPC 160 through a backhaul link 132 (e.g., an S1 interface). A base station 102 configured for 5G NR, collectively referred to as a next generation radio access network (Next Generation radio access network, NG-RAN), is connected to a core network 190 through a backhaul link 184. Base station 102 may perform, among other functions, one or more of the following: user data transfer, radio channel encryption and decryption, integrity protection, header compression, mobile control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection establishment and release, load balancing, distribution of non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (radio access network, RAN) sharing, multimedia broadcast multicast services (multimedia broadcast multicast service, MBMS), user (subscore) and device tracking, RAN information management (RAN information management, RIM), paging, positioning, and alert messaging. Base stations 102 may communicate with each other directly or indirectly (e.g., through EPC 160 or core network 190) over backhaul link 134 (e.g., an X2 interface). The backhaul link 134 may be wired or wireless.

The base station 102 may communicate wirelessly with the UE 104. Each of the base stations 102 may provide communication coverage for a respective geographic coverage area 110. There may be overlapping geographic coverage areas 110. For example, the small cell 102' may have a coverage area 110', the coverage area 110' overlapping with the coverage areas 110 of one or more macro base stations 102. A network comprising both small cells and macro cells may be referred to as a heterogeneous network. The heterogeneous network may also include a home evolved node B (home evolved node B, heNB), where the HeNB may provide services to a restricted group called a closed subscriber group (closed subscriber group, CSG). The communication link 120 between the base station 102 and the UE 104 may include UL (also may be referred to as a reverse link) transmissions from the UE 104 to the base station 102 and/or DL (also may be referred to as a forward link) transmissions from the base station 102 to the UE 104. Communication link 120 may use MIMO antenna techniques including spatial multiplexing, beamforming, and/or transmit diversity. The communication link may be through one or more carriers. The base station 102/UE 104 may use a spectrum up to Y megahertz (e.g., 5, 10, 15, 20, 100 megahertz) bandwidth per carrier, where the spectrum is allocated in carrier aggregation up to Yx megahertz (x component carriers) for transmission in each direction. The carriers may or may not be adjacent to each other. The allocation of carriers for DL and UL may be asymmetric (e.g., DL may be allocated more or less carriers than UL). The component carriers may include a primary component carrier and one or more secondary component carriers. The primary component carrier may be referred to as a primary cell (PCell), and the secondary component carrier may be referred to as a secondary cell (SCell).

Some UEs 104 may communicate with each other using a device-to-device (D2D) communication link 158. The D2D communication link 158 may use the DL/UL WWAN spectrum. The D2D communication link 158 may use one or more side link channels, such as a physical side link broadcast channel (physical sidelink broadcast channel, PSBCH), a physical side link discovery channel (physical sidelink discovery channel, PSDCH), a physical side link shared channel (physical sidelink shared channel, PSSCH), and a physical side link control channel (physical sidelink control channel, PSCCH). D2D communication may be through various wireless D2D communication systems, e.g., flashLinQ, wiMedia, bluetooth, zigBee, wi-Fi based on the IEEE 802.11 standard, LTE, NR, etc.

The wireless communication system further includes a wireless fidelity (wireless fidelity, wi-Fi) Access Point (AP) 150 that communicates with a Wi-Fi Station (STA) 152 in a 5 gigahertz unlicensed spectrum via a communication link 154. When communicating in the unlicensed spectrum, the STA 152/AP 150 may perform a clear channel assessment (clear channel assessment, CCA) to determine whether a channel is available prior to communicating.

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

Base station 102, whether a small cell 102' or a large cell (e.g., macro base station), may include an eNB, a gndeb (gNB), or other type of base station. Some base stations, such as gNB (or gNodeB) 180, may operate at millimeter wave (mmW) frequencies and/or near mmW frequencies to communicate with the UE 104. When the gNB 180 operates at mmW or near mmW frequencies, the gNB 180 may be referred to as a mmW base station. The extremely high Frequency (extremely high Frequency, EHF) is part of the Radio Frequency (RF) in the electromagnetic spectrum. EHF has a wavelength in the range of 30 gigahertz to 300 gigahertz and between 1 millimeter and 10 millimeters. The radio waves in this band may be referred to as millimeter waves. The near mmW may extend down to 3 gigahertz frequencies with a wavelength of 100 millimeters. The ultra-high frequency (super high frequency, SHF) band ranges from 3 gigahertz to 30 gigahertz, also known as a centimeter wave. Communications using mmW/near mmW RF bands have extremely high path loss and short range. Beamforming 182 may be used between the base station 180 and the UE 104 to compensate for extremely high path loss and shorter range.

The base station 180 may transmit the beamformed signals to the UE 104 in one or more transmit directions 108 a. The UE 104 may receive the beamformed signals from the base station 180 in one or more receive directions 108 b. The UE 104 may also transmit the beamformed signals in one or more transmit directions to the base station 180. The base station 180 may receive the beamformed signals from the UEs 104 in one or more directions. The base stations 180/UEs 104 may perform beam training to determine the best reception and transmission direction for each of the base stations 180/UEs 104. The transmission and reception directions of the base station 180 may be the same or different. The transmit and receive directions of the UE 104 may be the same or different.

EPC 160 includes a mobility management entity (mobility management entity, MME) 162, other MMEs 164, serving Gateway (GW) 166, MBMS Gateway (GW) 168, broadcast multicast service center (broadcast multicast service center, BM-SC) 170, and packet data network (packet data network, PDN) gateway 172. The MME 162 may communicate with a home subscriber server (Home Subscriber Server, HSS) 174. The MME 162 is a control node that handles signaling between the UE 104 and the EPC 160. Generally, MME 162 provides bearer and connection management. All user internet protocol (Internet protocol, IP) packets pass through the serving gateway 166, which serving gateway 166 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 BM-SC 170 connect to a PDN 176. The PDN 176 may include the internet, an intranet, an IP multimedia subsystem (IP multimedia subsystem, IMS), packet switched streaming services (PS Streaming Service, PSS), and/or other IP services. The BM-SC 170 may provide functionality for MBMS user service provisioning and delivery. The BM-SC 170 may be used as an entry point for content provider MBMS transmissions, may be used to authorize and initiate MBMS bearer services in a public land mobile network (public land mobile network, PLMN), and may be used to schedule MBMS transmissions. The MBMS GW 168 may be used to allocate MBMS traffic to base stations 102 belonging to a multicast broadcast single frequency network (multicast broadcast single frequency network, MBSFN) area broadcasting a particular service and is responsible for session management (start/stop) and collecting evolved MBMS (eMBMS) related payment information.

The core network 190 includes access and mobility management functions (Access and Mobility Management Function, AMF) 192, other AMFs 193, location management functions (location management function, LMF) 198, session management functions (Session Management Function, SMF) 194, user plane functions (User Plane Function, UPF) 195. The AMF 192 may communicate with a unified data management (Unified Data Management, UDM) 196. The AMF 192 is a control node that handles signaling between the UE 104 and the core network 190. In general, SMF 194 provides QoS flows and session management. All user internet protocol (Internet protocol, IP) datagrams are transmitted over the UPF 195. The UPF 195 provides UE IP address assignment as well as other functions. The UPF 195 is connected to an IP service 197.IP services 197 may include the internet, an intranet, an IP multimedia subsystem (IP Multimedia Subsystem, IMS), PS streaming services, and/or other IP services.

A base station may also be called a gNB, a Node B, an evolved Node B (eNB), an AP, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (basic service set, BSS), an extended service set (extended service set, ESS), or other suitable terminology. The base station 102 provides the UE 104 with an AP to the EPC 160. Examples of UEs 104 include a mobile phone, a smart phone, a session initiation protocol (session initiation protocol, SIP) phone, a notebook, a personal digital assistant (personal digital assistant, PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player), a camera, a game console, a tablet computer, a smart device, a wearable device, an automobile, an electricity meter, an air pump, an oven, or any other similarly functioning device. Some UEs 104 may also be referred to as IoT devices (e.g., parking timers, air pumps, ovens, automobiles, etc.). The UE 104 may also be referred to as a station, mobile station, subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, or other suitable terminology.

Although the invention may relate to 5G NR, the invention may be applicable to other similar fields, such as LTE, LTE-A, CDMA, global system for mobile communications (Global System for Mobile communications, GSM) or other wireless/radio access technologies.

Fig. 2 is a block diagram of a base station 210 in communication with a UE 250 in an access network. In DL, the controller/processor 275 may be provided with IP packets from the EPC 160. Controller/processor 275 implements layer 3 and layer 2 functions. Layer 3 includes a radio resource control (radio resource control, RRC) layer, and layer 2 includes a packet data convergence protocol (packet data convergence protocol, PDCP) layer, a radio link control (radio link control, RLC) layer, and a medium access control (medium access control, MAC) layer. The controller/processor 275 provides RRC layer functions, PDCP layer functions, RLC layer functions, and MAC layer functions, wherein the RRC layer functions are associated with system information (e.g., master information block (master information block, MIB), system information block (systeminformation block, SIB)) broadcast, RRC connection control (e.g., RRC connection paging, RRC connection setup, RRC connection modification, and RRC connection release), inter-radio access technology (Radio Access Technology, RAT) mobility, and measurement configuration for UE measurement reporting; wherein the PDCP layer function is associated with header compression/decompression, security (ciphering, deciphering, integrity protection, integrity verification), and handover support functions; wherein RLC layer functions are associated with delivery of upper layer Packet Data Units (PDUs), error correction by automatic repeat request (automatic repeat request, ARQ), concatenation, segmentation and reassembly of RLC service data units (service data unit, SDU), re-segmentation of RLC data PDUs and re-ordering of RLC data PDUs; wherein the MAC layer function is associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs to Transport Blocks (TBs), de-multiplexing of TB to MAC SDUs, scheduling information reporting, error correction by hybrid automatic repeat request (hybrid automatic repeat request, HARQ), priority handling and logical channel priority.

A Transmit (TX) processor 216 and a Receive (RX) processor 270 implement layer 1 functions associated with various signal processing functions. Layer 1 (including physical, PHY) layer may include error detection on a transport channel, forward error correction (forward error correction, FEC) encoding/decoding of a transport channel, interleaving (interleaving), rate matching, mapping on a physical channel, modulation/demodulation of a physical channel, and MIMO antenna processing. TX processor 216 processes a mapping to a signal constellation (constellation) based on various modulation schemes (e.g., binary phase-shift keying (BPSK), quadrature phase-shift keying (QPSK), M-phase-shift keying (M-PSK), M-quadrature amplitude modulation (M-quadrature amplitude modulation, M-QAM)). The coded and modulated symbols may then be split into parallel streams. Each stream may then be mapped to orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) subcarriers, multiplexed with reference signals (e.g., pilots) in the time and/or frequency domain, and then combined together using an inverse fast fourier transform (inverse fast Fourier transform, IFFT) to produce a physical channel carrying the time domain OFDM symbol stream. The OFDM streams are spatially precoded to produce a plurality of spatial streams. The channel estimates from the channel estimator 274 may be used to determine coding and modulation schemes, as well as for spatial processing. The channel estimate may be derived from a reference signal and/or channel state feedback transmitted by the UE 250. Each spatial stream may then be provided to a different antenna 220 via a separate transceiver 218 (transceiver 218 includes RX and TX). Each transceiver 218 may modulate an RF carrier with a respective spatial stream for transmission.

At the UE 250, each transceiver 254 (transceiver 254 includes RX and TX) receives signals through its respective antenna 252. Each transceiver 254 recovers information modulated onto an RF carrier and provides the information to the RX processor 256. TX processor 268 and RX processor 256 perform layer 1 functions associated with various signal processing functions. RX processor 256 may perform spatial processing on the information to recover any spatial streams that are to be transmitted to UE 250. If there are multiple spatial streams to send to UE 250, rx processor 256 combines the multiple spatial streams into a single OFDM symbol stream. The RX processor 256 then converts the OFDM symbol stream from the time domain to the frequency domain using a fast fourier transform (fast Fourier transform, FFT). The frequency domain signal comprises a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols and reference signals on each subcarrier are recovered and demodulated by determining the signal constellation most likely to be transmitted by base station 210. These soft decisions may be based on channel estimates computed by channel estimator 258. The soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by the base station 210 on the physical channel. The data and control signals are then provided to a controller/processor 259 that performs layer 3 and layer 2 functions.

The controller/processor 259 can be associated with a memory 260 that stores program codes and data. Memory 260 may be referred to as a computer-readable medium. In the UL, the controller/processor 259 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets from the EPC 160. The controller/processor 259 is also responsible for error detection using an Acknowledgement (ACK) and/or negative acknowledgement (Negative Acknowledgement, NACK) protocol to support HARQ operations.

Similar to the description of the functions of DL transmission by the base station 210, the controller/processor 259 provides RRC layer functions, PDCP layer functions, RLC layer functions, and MAC layer functions, wherein the RRC layer functions are associated with system information (e.g., MIB, SIB) acquisition, RRC connection, and measurement reports; PDCP layer functions are associated with header compression/decompression, and security (ciphering, deciphering, integrity protection, integrity verification); RLC layer functions are associated with delivery of upper layer PDUs, error correction by ARQ, concatenation, segmentation and reassembly of RLC SDUs, and reordering of RLC data PDUs; the MAC layer function is associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs to TBs, demultiplexing of TB to MAC SDUs, scheduling information reporting, error correction by HARQ, priority handling, and logical channel priority.

The channel estimate derived by channel estimator 258, which is derived from the reference signal or feedback transmitted by base station 210, may be used by TX processor 268 to select an appropriate coding and modulation scheme, and to facilitate spatial processing. The spatial streams generated by TX processor 268 may be provided to different antennas 252 via separate transceivers 254. Each transceiver 254 may modulate an RF carrier with a respective spatial stream for transmission. The manner in which the base station 210 processes UL transmissions is similar to the manner in which the receiver function at the UE 250 is described. Each transceiver 218 receives signals through a respective antenna 220. Each transceiver 218 recovers information modulated onto an RF carrier and provides the information to the RX processor 270.

The controller/processor 275 may be associated with a memory 276 that stores program codes and data. Memory 276 may be referred to as a computer-readable medium. In the UL, the controller/processor 275 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover IP packets from the UE 250. IP packets from controller/processor 275 may be provided to EPC 160. The controller/processor 275 is also responsible for error detection using ACK and/or NACK protocols to support HARQ operations.

NR refers to a radio configured to operate according to a new air interface (e.g., other than an OFDMA-based air interface) or a fixed transport layer (e.g., IP). NR may use OFDM with Cyclic Prefix (CP) in UL and DL and include support for half-duplex operation using time division duplex (Time Division Duplexing, TDD). NR may include critical tasks for enhanced mobile broadband (enhanced mobile broadband, eMBB) services with wide bandwidth (e.g., over 80 megahertz), mmW for high carrier frequencies (e.g., 60 gigahertz), massive MTC (MTC) for non-backward compatible machine type communication (Machine Type Communication, MTC) technologies, and/or Ultra-reliable low latency communication (Ultra-Reliable Low Latency Communication, URLLC) services.

A single component carrier with a bandwidth of 100 mhz may be supported. In one example, an NR Resource Block (RB) may span 12 subcarriers with a subcarrier bandwidth of 60 khz, a duration of 0.125 ms, or a subcarrier bandwidth of 15 khz, a duration of 0.5 ms. Each radio frame may include 20 or 80 subframes (or NR slots) of length 10 milliseconds. Each subframe may indicate a link direction (i.e., DL or UL) for data transmission, and the link direction of each subframe may be dynamically switched. Each subframe may include DL/UL data and DL/UL control data. UL and DL subframes of NR may be described in detail in fig. 5 and 6 below.

The NR RAN may include a Central Unit (CU) and a Distributed Unit (DU). An NR Base Station (BS) (e.g., gNB, 5G Node B, transmission reception point (transmission reception point, TRP), AP) may correspond to one or more BSs. An NR cell may be configured as an access cell (ACell) or a data only cell (DCell). For example, the RAN (e.g., CU or DU) may configure the cell. The DCell may be a cell for carrier aggregation or dual connectivity and is not used for initial access, cell selection/reselection or handover. In some cases, dcell does not send a synchronization signal (synchronization signal, SS). In some cases, the DCell transmits the SS. The NR BS may transmit a DL signal indicating a cell type to the UE. Based on the cell type indication, the UE may communicate with the NR BS. For example, the UE may determine an NR BS based on the indicated cell type to consider for cell selection, access, handover, and/or measurement.

Fig. 3 illustrates an example logical structure of a distributed RAN 300 in accordance with aspects of the present invention. The 5G access node 306 includes an access node controller (access node controller, ANC) 302. The ANC may be a CU of the distributed RAN 300. The backhaul interface to the next generation core network (next generation core network, NG-CN) 304 may terminate at the ANC. The backhaul interface to the next generation access node (next generation access node, NG-AN) may terminate at the ANC. ANC includes one or more TRP 308 (which may also be referred to as BS, NR BS, node B, 5G NB, AP, or some other terminology). As described above, TRP may be used interchangeably with "cell".

TRP 308 may be a DU. TRP may be connected to one ANC (ANC 302) or more than one ANC (not shown). For example, for RAN sharing, service radio (radio as a service, raaS), and service specific ANC deployments, TRP may be connected to more than one ANC. The TRP includes one or more antenna ports. TRP may be configured to serve traffic to the UE independently (e.g., dynamically selected) or jointly (e.g., jointly transmitted).

The local structure of the distributed RAN 300 may be used to describe a frontaul definition. Structures supporting a forward-drive solution across different deployment types may be defined. For example, the structure may be based on transmit network performance (e.g., bandwidth, latency, and/or jitter). The structure may share features and/or components with LTE. According to various aspects, NG-AN 310 may support dual connectivity with NR. NG-AN may share common preambles for LTE and NR.

The structure may enable collaboration between TRP 308. For example, collaboration may be within the TRP and/or across TRP presets via ANC 302. According to various aspects, an interface between TRPs may not be required/present.

According to various aspects, dynamic configuration of the split logic functions may exist within the distributed RAN 300 architecture. The PDCP, RLC, MAC protocol may be adaptively placed in ANC or TRP.

Fig. 4 illustrates an example physical structure of a distributed RAN 400 in accordance with aspects of the present invention. The centralized core network element (centralized core network unit, C-CU) 402 may assume core network functions. The C-CUs may be deployed centrally. The C-CU function may be offloaded (e.g., to advanced wireless services (advanced wireless service, AWS)) to handle peak capacity. The centralized RAN unit (centralized RAN unit, C-RU) 404 may assume one or more ANC functions. Alternatively, the C-RU may assume core network functions locally. The C-RUs may be distributed. The C-RU may be closer to the network edge. The DU 406 may entail one or more TRPs. The DUs may be located at the network edge with RF functionality.

Fig. 5 is a diagram 500 illustrating an example of DL-centric sub-frames. The DL-centric sub-frame comprises a control portion 502. The control portion 502 may exist in an initial or beginning portion of a DL-centric sub-frame. The control portion 502 includes various scheduling information and/or control information corresponding to portions of the DL-centric sub-frame. In some configurations, the control portion 502 may be a physical downlink control channel (physical downlink control channel, PDCCH), as shown in fig. 5. The DL-centric sub-frame also includes a DL data portion 504.DL data portion 504 is sometimes referred to as the payload of a DL-centric sub-frame. The DL data portion 504 includes communication resources for communicating from a scheduling entity (e.g., UE or BS) to a subordinate entity (e.g., UE). In some configurations, DL data portion 504 may be a physical downlink shared channel (physical downlink shared channel, PDSCH).

DL-centric sub-frames also include a common UL portion 506. The common UL portion 506 is sometimes referred to as a UL burst, a common UL burst, and/or various other suitable terms. The common UL portion 506 includes feedback information corresponding to various other portions of the DL-centric sub-frame. For example, the common UL portion 506 includes feedback information corresponding to the control portion 502. Non-limiting examples of feedback information include ACK signals, NACK signals, HARQ indications, and/or various other suitable types of information. The common UL portion 506 includes additional or alternative information, such as information related to random access channel (random access channel, RACH) procedures, scheduling requests (scheduling request, SR), and various other suitable types of information.

As shown in fig. 5, the end of DL data portion 504 may be separated in time from the beginning of common UL portion 506. This time separation may sometimes be referred to as a gap, guard period (guard interval), guard interval (guard interval), and/or other suitable terminology. The separation provides time for a handoff from DL communication (e.g., a receive operation of a subordinate entity (e.g., UE)) to UL communication (e.g., a transmission of the subordinate entity (e.g., UE)). Those skilled in the art will appreciate that the above is merely an example of DL-centric subframes and that alternative structures with similar features are possible without necessarily offsetting the aspects described herein.

Fig. 6 is a diagram 600 illustrating an example of UL-centric sub-frames. The UL-centric sub-frame comprises a control portion 602. The control portion 602 may be present in an initial or beginning portion of a UL-centric subframe. The control portion 602 of fig. 6 may be similar to the control portion 502 described with reference to fig. 5. The UL-centric sub-frame also includes UL data portion 604.UL data portion 604 may sometimes be referred to as the payload of a UL-centric subframe. The UL portion may refer to communication resources for communicating from a subordinate entity (e.g., UE) to a scheduling entity (e.g., UE or BS). In some configurations, the control portion 602 may be a PDCCH.

As shown in fig. 6, the end of the control portion 602 may be separated in time from the beginning of the common UL data portion 604. This time separation may sometimes be referred to as an interval, a guard period, a guard interval, and/or other suitable terminology. The separation provides time for a handoff from DL communication (e.g., a receive operation of a scheduling entity) to UL communication (e.g., a transmission of a scheduling entity). UL-centric sub-frames also include a common UL portion 606. The common UL portion 606 of fig. 6 may be similar to the common UL portion 606 described with reference to fig. 6. The common UL portion 606 may additionally or alternatively include information regarding channel quality indication (channel quality indicator, CQI), SRS, and various other suitable types of information. Those skilled in the art will appreciate that the above is merely an example of DL-centric subframes and that alternative structures with similar features are possible without necessarily offsetting the aspects described herein.

In some cases, two or more subordinate entities (e.g., UEs) may communicate with each other using side link (sidelink) signals. Practical applications for such side link communications include public safety, proximity services, UE-To-network relay, vehicle-To-Vehicle (V2V) communications, internet of everything (Internet of Everything, ioE) communications, ioT communications, mission-critical mesh (mission-critical mesh), and/or various other suitable applications. In general, a side link signal may refer to a signal of a communication from one subordinate entity (e.g., UE 1) to another subordinate entity (e.g., UE 2) without relaying the communication through a scheduling entity (e.g., UE or BS), even though the scheduling entity may be used for scheduling and/or control purposes. In some examples, the side-chain signals may communicate using licensed spectrum (as opposed to wireless local area networks, which typically use unlicensed spectrum).

Fig. 7 is a diagram 700 illustrating a distributed MIMO transmission. The present invention shows that multiple distributed low rank (rank) MTs or wireless devices can form a high rank MIMO transmitter/receiver. The base station 702 and the UE 704 communicate with each other via one or more repeaters (repeaters). The repeater may be a wireless device such as a mobile phone, a fixed client device (customer premise equipment, CPE) and a wireless router. In this example, there are K repeaters 706-1, 706-2, …, 706-K (K is an integer and K.gtoreq.1). The UE 704 and one or more of the K repeaters 706-1, 706-2, …, 706-K may be connected together to form a high rank MIMO transmitter/receiver network to extend the channel rank.

As described below, the repeater receives the RF signal on the first frequency band, shifts the RF carrier of the RF signal to the second frequency band, and then transmits the shifted RF signal on the second frequency band. Each frequency band is an interval in the frequency domain. In particular, the repeater may be a frequency translating repeater. The repeater may also be a delay repeater that receives an RF signal and then retransmits the received RF signal after a delay of a certain time. In addition, the repeater may receive an RF signal in a first time-frequency resource, convert the received RF signal to a second time-frequency resource, and then transmit the converted RF signal. In particular, the first time-frequency resource may be orthogonal to the second time-frequency resource.

The invention uses (f, t) to represent time-frequency resource: (f, t) ₁ Representing the time-frequency resources used by the base station to transmit and receive radio frequency signals. (f, t) _2，k Representing a specific repeater MT _k (K is an integer and 1.ltoreq.k.ltoreq.k) resources used for receiving RF signals. Thus, (f, t) _2，1 Indicating that the UE 704 is towards the relay 706-1 (i.e., MT ₁ ) Resources for transmitting RF signals; (f, t) _2，2 Indicating that the UE 704 is moving to the repeater 708 (i.e., MT ₂ ) The resources from which the signal is sent, and so on. In some configurations, (f, t) ₁ ，(f，t) _2，1 ，(f，t) _2，2 … and (f, t) _2，K Are orthogonal. In particular, they do not overlap in the frequency domain. In some configurations, (f, t) ₁ Can be combined with one (f, t) _2，k (k.epsilon.1, … K) are identical, while the rest are orthogonal to each other. Furthermore, (f, t) ₁ And (f, t) _2，k (1. Ltoreq.k) may be a non-overlapping component carrier, a non-overlapping bandwidth part (BWP), a non-overlapping frequency band, or a non-overlapping set in the same component carrier.

The UE 704 and the relay 706-1, 706-2, …, 706-K may be considered as an aggregate MT. Each of the UE 704 and the repeaters 706-1, 706-2, …, 706-K may be considered a component (MT) of the aggregate MT.

In the downlink direction, the base station 702 mayTo time-frequency resources (f, t) ₁ The signals are sent up to the UE 704 and the repeaters 706-l, …, 706-K. The repeaters 706-1, …, 706-K are at (f, t), respectively _2，1 …(f，t) _2，k And transmits a signal up to the UE 704.

Base station 702 uses a CSI framework that can support configuring multiple CSI reports for component MT. In order to efficiently configure multiple reports for the UE aggregation architecture, the base station 702 needs to obtain enough feedback from the UE 704 for adjusting the CSI reporting configuration. The feedback may include measurement reports, an indication of the capabilities of each component MT, or an indication of the capabilities of the aggregate MT. This feedback may help the base station 702 determine how to adjust the CSI reporting configuration.

In this example, the base station 702 may initialize an initial codebook with the UE 704 based on initial capability reports or feedback received from the UE 704. The initial capability report or feedback may indicate the effective or virtual antenna ports of the aggregate MT or the maximum rank supported by the aggregate MT and the total number of component MTs that make up the aggregate MT.

The base station 702 then configures an initial set of CSI-RSs (e.g., coarse reference signals) for measurement by the UE 704. The base station 702 sends an initial CSI-RS set to the UE 704. Based on the measurements, the UE 704 may suggest codebook parameters to the base station 702 in an initial report. Examples of suggested codebook parameters include codebook type, RS port number, and parameters that are adjustable in a predefined codebook structure.

Regarding codebook types, the UE 704 may indicate a uniform linear array (uniform linear array, ULA) codebook, a non-ULA based codebook (e.g., a precoder based on a Householder matrix), or a coherent joint transmission (coherent joint transmission, CJT) codebook in an initial report. For example, the adjustable parameters in the initial report may include in-phase parameters for in-phase between antenna panels.

The base station 702 may then configure the updated codebook and updated CSI reports for the UE 704 to obtain finer CSI based on the initial report. Finally, the UE 704 provides finer CSI reporting according to the new configuration.

As described above, the UE 704 may suggest that the base station 702 use a cqt codebook. Generally, a transmitter uses across N ₃ The precoder matrix W of the transmitters of the subbands may be expressed as:

w contains N ₃ N of sub-bands ₃ And precoder vectors. W (W) ₁ Is a wideband precoder and contains 2L vectors corresponding to 2L fundamental beams. L is the number of fundamental beams per polarization. W (W) _f ^H Containing Frequency Domain (FD) groups and adding N ₃ The subbands map to M delay domains. W (W) ₂ Is a 2l×m matrix.

Although the cqt codebook was originally designed for joint transmission of multiple transmission points, it may be reused to support communication between a single base station and an aggregate MT made up of multiple component MTs. In this example, the base station 702 may use N groups of antennas to transmit to N component MTs selected from the UE 704 and the repeaters 706-1, …, 706-K. The precoder matrix W may be represented asW _sub，i Is the precoder submatrix used by the i-th group of antennas to transmit signals to the i-th component MT of the N components MT.

There are two modes of CJT codebook relative to FD-base. In mode 1: each precoder matrix W _sub，i i=1.. N includes W specific to the precoder matrix _f，i . Accordingly, the precoder matrix W may be represented as

In mode 2, all precoder matrices W _sub，i (i=1,., N) includes a common W _f . Accordingly, the precoder matrix W may be represented as

Matrix W _1，i I=1,..n contains spatial basis vectors associated with the i-th group of antennas of the base station 702 for transmitting signals to the i-th component MT. When i has different values, the base station 702 may be W _1，i Different values are assigned.

In this example, the UE 704 and the repeaters 706-1, 706-2, 706-3 form an aggregate MT. Thus, n=4. As described above, the UE 704 may send an initial report to the base station 702 indicating the number of component MTs, the number of antennas used at each component MT, the cqt codebook type, and each W _sub，i Parameters of codebook components (e.g., W ₁ 、W ₂ And/or W _f )。

Thus, the base station 702 determines the precoder matrix W in mode 1 or mode 2 based on the suggestions in the initial report. When in mode 1, the precoder matrix W is:

when in mode 2, the precoder matrix W is:

thus, the base station 702 can determine four different sets of spatial basis vectors (i.e., W _1，1 ，、W _1，2 、W _1，3 And W is _1，4 ). Thus, the base station 702 may form a transmit beam by precoding in four different directions to the UE 704 and the repeaters 706-1, 706-2, 706-3, respectively.

Subsequently, the number of repeaters in the aggregate MT may change. The UE 704 may indicate this change to the base station 702. Thus, the base station may update the CJT codebook based on the new N value.

The base station 702 does not rely solely on the number of components MT in the aggregate MT to determine the value of N. Smaller than component MT An N value of the total number may be sufficient, especially in case of a plurality of components MT being close to each other. The UE 704 may suggest optimal codebook parameters, such as the value of N, or for forming each sub-matrix W, directly to the base station 702 _sub，i Is a parameter of (a). For example, the UE 704 may report each W _sub，i Is used for the matrix dimension of (a).

On the downlink, after receiving the initial report and/or feedback from the UE 704, the base station 702 may update the configuration of measurement resources and the configuration of CSI reports to obtain finer CSI. These updates may be sent to the UE 704 via the MAC CE. In this example, the UE 704 is equipped with 4 antennas for use in time-frequency resources (f, t) ₁ And time-frequency resources (f, t) _2，1 And simultaneously received. Repeater 706-1 is a wireless device having 4 antennas for receiving on time-frequency resource (f, t) 1 and 4 antennas for receiving on time-frequency resource (f, t) _2，1 And the device transmitting. As described above, the base station 702 can be configured to operate on time-frequency resources (f, t) ₁ Directly to the UE 704. In addition, the base station 702 can also utilize time-frequency resources (f, t) ₁ Up to repeater 706-1. The repeater 706-1 receives the time frequency resources (f, t) ₁ And on time-frequency resources (f, t) _2，1 The signal is forwarded to the UE 704.

After the UE 704 and the repeater 706-1 form the aggregate MT, the total number of receive antennas on all virtual panels of the aggregate MT is 8. Although the aggregation of the UE 704 and the relay 706-1 may support 8 layers at maximum, it is not necessary to always configure 8 (precoded) CSI-RS ports to acquire CSI, since this depends on the channel characteristics of all links between all transmit-receive pairs. If the channel rank of the end-to-end channel between the base station 702 and the aggregate UE is 6, the base station 702 may configure 6 precoding CSI-RS ports. This may occur if the channel between the UE 704 and the repeater 706-1 is line of sight or poorly conditioned. The base station 702 needs side assistance information from the UE side to know how many CSI-RS ports are sufficient (in this example, number 6). And, the repeater 706 may later disengage and then fall back to the case of a single normal UE that can support up to layer 4.

The UE 704 may also feedback information to suggest the number of RS ports and port selection. In this example, base station 702 initially configures 8 CSI-RS ports for CSI acquisition; the 8 CSI-RS ports are associated with CSI reports corresponding to an aggregate MT formed by the UE 704 and the relay 706-l, or with two CSI reports corresponding to a direct link from the base station 702 to the UE 704 and an indirect link from the base station 702 to the UE 704 via the relay 706-1, respectively. In CSI reporting, the UE 704 may suggest which ports have better reception quality, so that the base station 702 may not need to configure/use all 8 ports in order to reduce the overhead of CSI-RS. The report may suggest a group port selected downward from the ports of the measurements, as compared to a conventional CSI report including CRI/RI/PMI/CQI. For example, after measuring 8 ports (including 4 ports corresponding to direct links and 4 ports corresponding to indirect links through repeater 706-l, respectively), UE 704 may suggest using only 6 of the 8 ports measured. This is equivalent to suggesting that the precoding coefficient of the precoder is zero, such as [ c1, c2, c3, c4, c5, c6, 0], or that the resource configuration to change CSI reports employs 6 ports instead of 8 ports.

Because the components of the aggregated UE may change, some updates of the reporting configuration, e.g., the maximum value for rank reporting, may be updated accordingly. The MAC CE may be sufficient for such an update.

Similar to the DL framework, for the UL framework, the base station 702 may initialize a reference signal set for transmission of the UE 704 based on a capability report from an aggregation device of the UE 704, the capability report including a supported maximum number of spatial layers. The UE 704 then transmits a reference signal to the base station 702. The base station 702 measures reference signals transmitted by the UE 704. Based on the measurements, the base station 702 may newly configure the sounding/reporting to obtain finer CSI. The base station 702 performs probing with finer granularity depending on the new configuration. The base station may change the codebook type, the number of RS ports, or some parameters adjustable in the predefined codebook structure.

In the uplink direction, in this example, the base station 702 may initialize an initial codebook with the UE 704 based on initial capability reports or feedback received from the UE 704. The initial capability report or feedback may indicate the effective or virtual antenna ports of the aggregate MT or the rank supported by the aggregate MT and the number of components MTs that make up the aggregate MT. The base station 702 initially configures the UE 704 to transmit SRS to the base station 702 for coarse measurements.

Thus, the UE 704 transmits SRS to the base station 702. The base station 702 makes coarse measurements for SRS. Based on the measurements, the base station 702 can configure new SRS resources and new codebook parameters for the UE. The base station 702 may configure a new codebook for use by the UE 704 in uplink precoding. The codebook may be a ULA codebook, a non-ULA based codebook (e.g., a precoder based on a Householder matrix), or a CJT codebook. For example, codebook parameters may include in-phase parameters for in-phase between antenna panels. The UE 704 and the base station 702 may then perform uplink sounding at a finer granularity. Other techniques described above with respect to the downlink direction may be equally applied to the uplink direction.

In another example, the UE 704 may feedback information to suggest codebook parameters (e.g., codebook types) for uplink data transmission. The codebook type may be ULA codebooks, non-ULA based codebooks (e.g., a precoder based on a Householder matrix), or CJT codebooks. The feedback information may depend on the implementation of the UE 704 or otherwise by means of downlink reference signals and channel reciprocity. For example, the base station 702 may configure an initial set of downlink reference signals to the UE 704 for downlink channel measurements. Based on channel reciprocity, the UE 704 may approximate the uplink channel between the aggregate MT to the base station 702 based on channel measurements. The UE 704 may then derive feedback information based on the measurements.

In this example, as described above, the UE 704 may be directly on the time-frequency resources (f, t) ₁ Up to the base station 702. In addition, the UE 704 may also be configured to perform scheduling on time-frequency resources (f, t) _2，1 Up to the repeater 706-l. The repeater 706-l receives the time frequency resources (f, t) _2，1 And on time-frequency resources (f, t) ₁ And forwards the signal to the base station 702.

The base station 702 may initially allocate 8 ports of SRS resources for UL channel sounding from the UE 704; UE 704 in time-frequency resources (f, t) ₁ Upper transmit part 8 ports, inTime-frequency resource (f, t) _2，1 And the remaining ports are sent up. Based on the measurement of SRS resources at the base station side, if the base station 702 finds that the signal quality corresponding to a part of the ports is too weak, the base station 702 may adjust the number of SRS ports to, for example, 6. The UE 704 then transmits the SRS according to the updated SRS resource configuration.

Fig. 8 is a flow chart 800 of a method (process) for configuring a codebook in the downlink direction for a distributed MIMO transmitter/receiver. The method may be performed by a UE (e.g., UE 704). In operation 802, the UE transmits a capability report to the base station, the capability report indicating one or more capabilities of an aggregated MT formed by the UE and one or more devices (each as a component device). The one or more capabilities include at least one of a first number of antenna ports supported by the aggregate MT and a number of component MTs comprising the aggregate MT.

In operation 804, the UE receives a configuration of an initial reference signal set from a base station, which may be responsive to the one or more capabilities. In operation 806, the UE measures an initial reference signal set transmitted by the base station.

In operation 808, the UE determines codebook parameters based on measurements of the initial set of reference signals. The codebook parameters include at least one of: the codebook type, one or more adjustable parameters associated with the codebook type, and a second number of antenna ports preferred by the aggregate MT.

In some configurations, the one or more adjustable parameters include an in-phase parameter for in-phase between a plurality of antenna panels associated with the aggregate MT. In some configurations, the codebook parameters indicate a downlink precoder matrix for CSI reports, which contain a number of precoder sub-matrices corresponding to the number of components MT. A first precoder sub-matrix of the plurality of precoder sub-matrices uses a first set of spatial bases and a second precoder sub-matrix of the plurality of precoder sub-matrices uses a second set of spatial bases, wherein the first set of spatial bases is different from the second set of spatial bases.

In operation 810, the UE transmits an initial report indicating codebook parameters. In operation 812, the UE receives a codebook configuration of a codebook for generating a downlink precoder matrix for CSI reporting from a base station. In operation 814, the UE receives a configuration of a second set of reference signals determined based on the codebook and a second number of antenna ports. In operation 816, the UE measures a second set of reference signals. In operation 818, the UE transmits the CSI report derived from the codebook and measured from the second set of reference signals.

Fig. 9 is a flow chart 900 of a method (procedure) for configuring a codebook in the uplink direction for a distributed MIMO transmitter/receiver. The method may be performed by a UE (e.g., UE 704). In operation 902, the UE transmits a capability report to the base station, the capability report indicating one or more capabilities of an aggregated MT formed by the UE and one or more devices (each as a component device). The one or more capabilities include at least one of a first number of antenna ports supported by the aggregate MT and a number of components MTs that make up the aggregate MT in the uplink transmission.

In operation 904, the UE receives a configuration of an initial set of sounding reference signals from the base station, which may be responsive to the one or more capabilities. In some configurations, the UE also receives a configuration of a set of downlink reference signals to be measured by the UE in order to derive an initial report. In operation 906, the UE transmits an initial set of sounding reference signals to the base station. In operation 908, the UE transmits an initial report indicating codebook parameters. The codebook parameters include at least one of: the codebook type, one or more adjustable parameters associated with the codebook type, and a second number of antenna ports preferred by the aggregate MT in uplink transmissions.

In operation 910, the UE receives, from a base station, a codebook configuration for generating a codebook of an uplink precoder matrix for an uplink transmission. In operation 912, the UE receives a configuration of an updated set of sounding reference signals based on the codebook and a second number of configurations of antenna ports. In operation 914, the UE transmits the updated sounding reference signal set to the base station.

In operation 916, the UE receives an indication of an uplink precoder matrix. The indication of the uplink precoder matrix is according to a codebook and in response to transmission of an updated set of sounding reference signals.

In some configurations, the uplink precoder matrix comprises a plurality of precoder sub-matrices corresponding to the number of components MT. A first precoder sub-matrix of the plurality of precoder sub-matrices uses a first set of spatial bases and a second precoder sub-matrix of the plurality of precoder sub-matrices uses a second set of spatial bases, wherein the first set of spatial bases is different from the second set of spatial bases. Each precoder sub-matrix applies to signals transmitted from the UE to a respective component MT of the base station or plurality of component MTs.

Further, the base station may perform the following operations to configure a codebook for a distributed MIMO transmitter/receiver. The base station receives the capability report from the UE. The capability report indicates one or more capabilities of the aggregated MT formed by the UE and the one or more relays. Each repeater is a component MT. The base station configures an initial set of reference signals for the UE based on the one or more capabilities. The base station transmits an initial set of sounding reference signals to the UE. The base station receives an initial report from the UE. The initial report indicates codebook parameters. The base station determines a codebook. The codebook is initialized or updated according to the codebook parameters. The base station configures a codebook for the UE.

In an aspect, a codebook is used to generate a downlink precoder matrix for CSI reporting. The one or more capabilities include at least one of a first number of antenna ports supported by the aggregate MT and a number of component MTs comprising the aggregate MT. The codebook parameters include at least one of: the codebook type, one or more adjustable parameters associated with the codebook type, and a second number of antenna ports preferred by the aggregate MT. The one or more adjustable parameters include an in-phase parameter for in-phase between a plurality of antenna panels associated with the aggregate MT.

The base station configures a second set of reference signals based on the codebook and a second number of antenna ports. The base station transmits a second set of reference signals to the UE. The base station receives the CSI report from the UE according to the codebook.

The codebook parameters indicate a downlink precoder matrix for CSI reports containing a number of precoder submatrices corresponding to the number of components MT. A first precoder sub-matrix of the plurality of precoder sub-matrices uses a first set of spatial bases and a second precoder sub-matrix of the plurality of precoder sub-matrices uses a second set of spatial bases, wherein the first set of spatial bases is different from the second set of spatial bases.

In another aspect, a codebook is used for a base station to indicate an uplink precoder matrix for uplink transmissions from a UE. The one or more capabilities include at least one of a first number of transmit antenna ports supported by the aggregate MT in uplink transmissions and a number of components MTs that make up the aggregate MT.

The base station configures an initial set of sounding reference signals by configuring the UE to send sounding reference signals to the base station. The codebook parameters include at least one of: the codebook type, one or more adjustable parameters associated with the codebook type, and a second number of antenna ports preferred by the aggregate MT in uplink transmissions.

The base station determines an uplink precoder matrix comprising a plurality of precoder sub-matrices corresponding to the number of components MT. A first precoder sub-matrix of the plurality of precoder sub-matrices uses a first set of spatial bases and a second precoder sub-matrix of the plurality of precoder sub-matrices uses a second set of spatial bases, wherein the first set of spatial bases is different from the second set of spatial bases.

The base station configures an updated set of sounding reference signals based on the codebook and the second number of antenna ports. The base station measures an updated set of sounding reference signals from the UE. The base station generates an indication of the uplink precoder matrix based on the measurements of the updated set of sounding reference signals and the codebook. Each precoder sub-matrix applies to signals transmitted from the UE to a respective component MT of the base station or plurality of component MTs.

Fig. 10 is a schematic diagram 1000 depicting an example of a hardware implementation for an apparatus 1002 employing a processing system 1014. The apparatus 1002 may be a UE. The processing system 1014 may implement a bus (bus) architecture, represented generally by the bus 1024. The bus 1024 includes any number of interconnecting buses and bridges depending on the specific application of the processing system 1014 and the overall design constraints. The bus 1024 links together various circuits including one or more processors and/or hardware components, represented by the one or more processors 1004, the receiving component 1064, the sending component 1070, the multi-panel codebook configuration component 1076, the multi-panel transmission configuration component 1078, and the computer-readable medium/memory 1006. The bus 1024 may also link various other circuits such as timing sources, external devices, voltage regulators, power management circuits, and the like.

The processing system 1014 may be coupled with the transceiver 1010, wherein the transceiver 1010 may be one or more of the transceivers 254. The transceiver 1010 may be coupled to one or more antennas 1020, where the antennas 1020 may be the communication antenna 252.

The transceiver 1010 provides a means for communicating with various other apparatus over a transmission medium. Transceiver 1010 receives signals from one or more antennas 1020, extracts information from the received signals, and provides the extracted information to processing system 1014 (and in particular to receive component 1064). In addition, transceiver 1010 receives information from processing system 1014 (and in particular, transmission component 1070) and generates a signal based on the received information for application to one or more antennas 1020.

The processing system 1014 includes one or more processors 1004 coupled with a computer-readable medium/memory 1006. The one or more processors 1004 are responsible for overall processing, including the execution of software stored on the computer-readable medium/memory 1006. The software, when executed by the one or more processors 1004, causes the processing system 1014 to perform the various functions of any particular apparatus described supra. The computer-readable medium/memory 1006 may also be used for storing data that is manipulated by the one or more processors 1004 when executing software. The processing system 1014 also includes at least one of a receiving component 1064, a sending component 1070, a multi-panel codebook configuration component 1076, and a multi-panel transmission configuration component 1078. The components described above may be software components running in one or more processors 1004, resident/stored in the computer readable medium/memory 1006, one or more hardware components coupled to the one or more processors 1004, or a combination of the above. Processing system 1014 may be a component of UE 250 and include memory 260 and/or at least one of TX processor 268, RX processor 256, and controller/processor 259.

In one configuration, the apparatus 1002 for wireless communication includes means for performing each of the operations of fig. 8-9. The means may be the one or more components of the processing system 1014 of the device 1002 configured to perform the functions recited by the means.

As described above, processing system 1014 includes TX processor 268, RX processor 256, and controller/processor 259. Likewise, in one configuration, the means may be TX processor 268, RX processor 256, and controller/processor 259 configured to perform the functions recited by the means.

It should be understood that the specific order or hierarchy of steps in the processes/flowcharts disclosed are descriptions of exemplary approaches. It should be appreciated that the particular order or hierarchy of steps in the processes/flowcharts may be rearranged based on design preferences. In addition, some steps may be further combined or omitted. The accompanying method claims present elements of the various steps in a sample order, and are not meant to limit the invention to the specific order or hierarchy presented.

The previous description is provided to enable any person skilled in the art to practice the various aspects of the invention described. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown herein, but are to be accorded the full scope consistent with the language claims, in which reference to an element in the singular is not intended to mean "one and only one" unless specifically so stated, but rather "one or more". The term "exemplary" means "serving as an example, instance, or illustration" in the present disclosure. Any aspect described as "exemplary" is not necessarily preferred or advantageous over other aspects. The term "some" means one or more unless stated otherwise. Combinations such as "at least one of A, B or C", "one or more of A, B or C", "at least one of A, B and C", "one or more of A, B and C", and "A, B, C or any combination thereof" include any combination of A, B and/or C, and may include a plurality of a, a plurality of B, or a plurality of C. Specifically, combinations such as "at least one of A, B or C", "one or more of A, B or C", "at least one of A, B and C", "one or more of A, B and C", and "A, B, C or any combination thereof" may be a alone, B alone, C, A and B, A and C, B and C, or a and B and C, wherein any such combination may include one or more members of A, B or C. All structural and functional equivalents to the elements of the various aspects described herein are known or later come to be known to those of ordinary skill in the art and are expressly incorporated herein by reference and are intended to be encompassed by the claims. Furthermore, nothing disclosed herein is intended to be dedicated to the public regardless of whether the invention is explicitly recited in the claims. The terms "module," mechanism, "" component, "" apparatus, "and the like may not be a substitute for the term" means. Thus, unless the phrase "means for …" is used to explicitly state an element in a claim, the element should not be construed as a functional limitation.

Claims (20)

1. A method of wireless communication for a user device, comprising:

transmitting a capability report to a base station, the capability report indicating one or more capabilities of an aggregated mobile terminal formed by the user equipment and one or more devices, each device acting as a component device;

receiving a configuration of an initial reference signal set from the base station;

sending an initial report indicating codebook parameters; and

a codebook configuration of a codebook is received from the base station, the codebook being used to generate a downlink precoder matrix for channel state information reporting or to generate an uplink precoder matrix for uplink transmission.

2. The wireless communication method of claim 1, wherein the codebook is used to generate a downlink precoder matrix for channel state information reporting, the method further comprising:

the initial set of reference signals transmitted from the base station is measured.

3. The wireless communication method of claim 2, wherein the one or more capabilities include at least one of a first number of antenna ports supported by the aggregate mobile terminal and a number of component mobile terminals comprising the aggregate mobile terminal.

4. The wireless communication method of claim 2, further comprising:

determining the codebook parameters based on measurements of the initial set of reference signals, wherein the codebook parameters include at least one of: a codebook type, one or more adjustable parameters associated with the codebook type, and a second number of antenna ports preferred by the aggregate mobile terminal.

5. The wireless communication method of claim 4, wherein the one or more adjustable parameters comprise an in-phase parameter for in-phase between a plurality of antenna panels associated with the aggregate mobile terminal.

6. The wireless communication method of claim 4, further comprising:

receiving a configuration of the second set of reference signals determined based on a codebook and a second number of the antenna ports;

measuring the second set of reference signals; and

a channel state information report is sent, the channel state information report being derived from measurements of the second set of reference signals and from the codebook.

7. The wireless communication method of claim 2, wherein the codebook parameters indicate a downlink precoder matrix for channel state information reporting, the downlink precoder matrix comprising a plurality of precoder sub-matrices corresponding to a number of component mobile terminals.

8. The wireless communication method of claim 7, wherein a first precoder sub-matrix of the plurality of precoder sub-matrices uses a first set of spatial bases, and a second precoder sub-matrix of the plurality of precoder sub-matrices uses a second set of spatial bases, the first set of spatial bases being different from the second set of spatial bases.

9. The wireless communication method of claim 1, wherein the codebook is used for the user device to generate an uplink precoder matrix for uplink transmissions.

10. The wireless communication method of claim 9, wherein the one or more capabilities include at least one of a first number of transmit antenna ports supported by the aggregated mobile terminal in uplink transmissions and a number of component terminals comprising the aggregated mobile terminal.

11. The wireless communication method of claim 9, wherein the initial set of reference signals are sounding reference signals, the method further comprising transmitting the sounding reference signals to the base station.

12. The wireless communication method of claim 9, wherein the codebook parameters comprise at least one of: a codebook type, one or more adjustable parameters associated with the codebook type, and a second number of antenna ports in an uplink transmission preferred by the aggregated mobile terminal.

13. The wireless communication method of claim 9, wherein the initial set of reference signals is downlink reference signals measured by the user device to derive the initial report.

14. The wireless communication method of claim 9, further comprising:

an indication of the uplink precoder matrix is received, the uplink precoder matrix comprising a plurality of precoder sub-matrices corresponding to the number of component terminals.

15. The wireless communication method of claim 14, wherein a first precoder sub-matrix of the plurality of precoder sub-matrices uses a first set of spatial bases, and a second precoder sub-matrix of the plurality of precoder sub-matrices uses a second set of spatial bases, the first set of spatial bases being different from the second set of spatial bases.

16. The wireless communication method of claim 14, further comprising:

receiving a configuration of an updated set of sounding reference signals based on the codebook and a second number of configurations of the antenna ports;

the method further includes transmitting the updated set of sounding reference signals to the base station, wherein the indication of the uplink precoder matrix is codebook-dependent and is responsive to transmission of the updated set of sounding reference signals.

17. The wireless communication method of claim 9, wherein each precoder sub-matrix is applied to signals transmitted from the user device to a respective component mobile terminal of the base station or the plurality of component mobile terminals.

18. A method of wireless communication of a base station, comprising:

receiving a capability report from a user device, the capability report indicating one or more capabilities of an aggregated mobile terminal formed by the user device and one or more repeaters, each repeater acting as a component device;

configuring an initial reference signal set for the user equipment based on the one or more capabilities;

transmitting the initial reference signal set to the user equipment;

receiving an initial report indicating codebook parameters from the user equipment;

determining a codebook initialized or updated according to the codebook parameters for generating a downlink precoder matrix for channel state information reporting; and

and configuring the codebook for the user equipment.

19. The wireless communication method of claim 18, wherein the codebook parameters comprise at least one of: a codebook type, one or more adjustable parameters associated with the codebook type, and a second number of antenna ports preferred by the aggregate mobile terminal.

20. The wireless communication method of claim 18, wherein the codebook parameters indicate a downlink precoder matrix for channel state information reporting, the downlink precoder matrix comprising a plurality of precoder sub-matrices corresponding to a number of component mobile terminals.