Channel state information reporting method and device

Abstract

In one aspect of the present invention, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE measures a first reference signal set at a first time point to determine a first set of values ​​corresponding to a channel state information parameter set. The UE determines a difference between the first set of values ​​and a reference value set corresponding to the CSI parameter set. The UE transmits a first CSI report including a change indicator indicating the difference. The present invention achieves the beneficial effect of saving resources.

Description

Technical Field

[0001] The present invention relates generally to communication systems, and more particularly to reporting channel state information (CSI) at user equipment (UE). Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

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

[0004] These multiple access technologies are applied to various telecommunication standards to provide a common protocol that enables different wireless devices to communicate at a municipal, national, regional, and even global level. An example telecommunication standard is 5G New Radio (NR). 5G NR is part of the continued evolution of mobile broadband released by the Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (for example, with the Internet of Things (IoT)) and other requirements. Some aspects of 5G NR may be based on the 4G long term evolution (LTE) standard. 5G NR technology still needs further improvement. These improvements may also apply to other multiple access technologies and the telecommunication standards that adopt these technologies. Summary of the Invention

[0005] The following presents a simplified summary of one or more aspects in order to provide a basic understanding of these aspects. This summary is not a comprehensive overview of all contemplated aspects and is neither intended to identify key or critical elements of all aspects nor to 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.

[0006] In one aspect of the present invention, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a user equipment (UE). The UE includes a memory and at least one processor coupled to the memory. The at least one processor is configured to: measure a first reference signal set at a first time point to determine a first set of values ​​corresponding to a channel state information parameter set; determine a difference between the first set of values ​​and a reference value set corresponding to the CSI parameter set; and transmit a first CSI report including a change indicator indicating the difference.

[0007] The method includes measuring a first reference signal set at a first point in time to determine a first set of values ​​corresponding to a channel state information parameter set; determining a difference between the first set of values ​​and a reference value set corresponding to the CSI parameter set; and sending a first CSI report including a change indicator indicating the difference.

[0008] The present invention proposes a method and apparatus for reporting channel state information, which utilizes the relevance of channel state information in the time domain to achieve the beneficial effect of saving resources.

[0009] To accomplish the foregoing and related ends, the features encompassed by the one or more aspects and particularly pointed out in the claims are hereinafter fully described. The following description and accompanying drawings set forth in detail certain illustrative features of the one or more aspects. However, these features are indicative of but a few of the various ways in which the principles of the various aspects may be employed, and this description is intended to include all such aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a schematic diagram illustrating an example of a wireless communication system and an access network.

[0011] Figure 2 is a block diagram illustrating a base station in an access network communicating with a UE.

[0012] Figure 3 An example logical architecture of a distributed radio access network is shown.

[0013] Figure 4 An example physical architecture of a distributed radio access network is shown.

[0014] Figure 5 is a diagram showing an example of a DL-centric time slot.

[0015] Figure 6 is a diagram showing an example of a time slot centered on UL.

[0016] Figure 7 is a schematic diagram illustrating CSI reporting from a UE to a base station.

[0017] Figure 8 is another diagram illustrating CSI reporting from a UE to a base station.

[0018] Figure 9 is a schematic diagram illustrating a technique for CSI reporting.

[0019] Figure 10 This is a flowchart of a method (process) for performing CSI reporting.

[0020] Figure 11 is an example showing a hardware implementation for an apparatus using a processing system. DETAILED DESCRIPTION

[0021] The embodiments described below in conjunction with the accompanying drawings are intended as descriptions of various configurations and are not intended to represent the only configurations in which the concepts described herein may be practiced. The embodiments include specific details intended to provide a thorough understanding of the various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In some examples, known structures and components are shown in block diagram form to avoid obscuring these concepts.

[0022] Several aspects of telecommunications systems will now be described with reference to various apparatus and methods. These apparatus and methods are described in the following detailed descriptions and in the accompanying drawings using various blocks, components, circuits, processes, algorithms, and the like (hereinafter collectively referred to as "elements"). These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether these elements are implemented in hardware or software depends on the specific application and design constraints imposed on the overall system.

[0023] A component, any portion of a component, or any combination of components may be implemented, by way of example, as a "processing system" comprising one or more processors. Examples of processors include a microprocessor, a microcontroller, a graphics processing unit (GPU), a central processing unit (CPU), an application processor, a digital signal processor (DSP), a reduced instruction set computing (RISC) processor, a system on a chip (SoC), a baseband processor, a field programmable gate array (FPGA), a programmable logic device (PLD), a state machine, gated logic, discrete hardware circuits, and other suitable hardware configured to perform various functions described throughout the present invention. One or more processors in a processing system may execute software. Software shall be construed broadly to mean instructions, sets of instructions, code, code segments, program code, programs, subroutines, software components, applications, software applications, software packages, routines, subroutines, objects, executables, execution threads, processes, and functions, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0024] Therefore, in one or more aspects, the functions described can be implemented in hardware, software, or any combination thereof. If implemented in software, the functions can be stored on a computer-readable medium or encoded as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media. The storage medium can be any available medium accessed by a computer. For example, but not limited to, these computer-readable media may include random-access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, and a combination of the above-mentioned computer-readable media types, or any other medium for storing computer executable code in the form of instructions or data structures accessed by a computer.

[0025] Figure 1 1 is a schematic diagram illustrating an example of a wireless communication system and access network 100. The wireless communication system (also referred to as a wireless wide area network (WWAN)) includes a base station 102, a UE 104, an Evolved Packet Core (EPC) 160, and another core network 190 (e.g., a 5G Core (5GC)). The base station 102 may include a macrocell (a high-power cellular base station) and / or a small cell (a low-power cellular base station). A macrocell includes a base station. A small cell includes a femtocell, a picocell, and a microcell.

[0026] Base stations 102 configured for 4G (collectively referred to as the evolved universal mobile telecommunications system terrestrial radio access network (E-UTRAN)) interface with a core network 160 via a backhaul link 132 (e.g., an S1 interface). Base stations 102 configured for 5G NR (collectively referred to as the Next Generation RAN (NG-RAN)) interface with a core network 190 via a backhaul link 184. Among other functions, the base stations 102 may perform one or more of the following functions: user data delivery, radio channel encryption and decryption, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection establishment and release, load balancing, distribution of non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS), user and device tracking, RAN information management (RIM), paging, positioning, and alerting messaging. The base stations 102 may communicate with each other directly or indirectly (e.g., via the EPC 160 or the core network 190) via a backhaul link 134 (e.g., an X2 interface). The backhaul link 134 may be wired or wireless.

[0027] Base stations 102 can communicate wirelessly with UEs 104. Each of base stations 102 can provide communication coverage for a corresponding geographic coverage area 110. There can be overlapping geographic coverage areas 110. For example, a small cell 102' can have a coverage area 110' that overlaps with the coverage area 110 of one or more macro base stations 102. A network that includes both small cells and macro cells can be referred to as a heterogeneous network. A heterogeneous network can also include a home evolved node B (HeNB), where the HeNB can provide service to a restricted group called a closed subscriber group (CSG). The communication link 120 between base station 102 and UE 104 can include uplink (UL) (also referred to as reverse link) transmissions from UE 104 to base station 102 and / or downlink (DL) (also referred to as forward link) transmissions from base station 102 to UE 104. The communication link 120 can use Multiple-Input and Multiple-Output (MIMO) antenna technology, which includes spatial multiplexing, beamforming and / or transmit diversity. The communication link can be via one or more carriers. The base station 102 / UE 104 can use a spectrum of up to X MHz bandwidth per carrier (for example, 5, 10, 15, 20, 100, 400 MHz, etc.), where each carrier is allocated in a total of up to Yx MHz carrier aggregation (x component carriers) for transmission in each direction. The carriers may be adjacent to each other or not. The allocation of carriers for DL ​​and UL may be asymmetric (for example, more or fewer carriers may be allocated for DL ​​than for UL). The component carrier may include a primary component carrier and one or more secondary component carriers. The primary component carrier may be referred to as a primary cell (PCell) and the secondary component carrier may be referred to as a secondary cell (SCell).

[0028] Certain 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 sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), and a physical sidelink control channel (PSCCH). D2D communication may be performed over various wireless D2D communication systems, such as FlashLinQ, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the IEEE 802.11 standard, LTE, or NR.

[0029] The wireless communication system may further include a Wi-Fi access point (AP) 150, wherein the Wi-Fi AP 150 communicates with a Wi-Fi station (STA) 152 in the 5 GHz unlicensed spectrum via a communication link 154. When communicating in the unlicensed spectrum, the STA 152 / AP 150 may perform a clear channel assessment (CCA) to determine whether the channel is available before communicating.

[0030] The small cell 102′ can operate in licensed and / or unlicensed spectrum. When operating in the unlicensed spectrum, the small cell 102′ can employ NR and use the same 5 GHz unlicensed spectrum used by the Wi-Fi AP 150. The small cell 102′ employing NR in the unlicensed spectrum can improve the coverage of the access network and / or increase the capacity of the access network.

[0031] Base station 102, whether a small cell or a large cell (e.g., a macro base station), may include an eNB, a next-generation NodeB (gNodeB, gNB) 180, or another type of base station. Some base stations, such as gNB 180, may operate in the traditional sub-6 GHz frequency band, millimeter wave (mmW) frequencies, and / or near-mmW frequencies to communicate with UE 104. When gNB 180 operates at mmW or near-mmW frequencies, gNB 180 may be referred to as a mmW base station. Extremely high frequency (EHF) is a portion of the radio frequency (RF) portion of the electromagnetic spectrum. EHF has a range of 30 GHz to 300 GHz and a wavelength between 1 mm and 10 mm. Radio waves in this frequency band may be referred to as millimeter waves. Near-mmW frequencies extend down to 3 GHz and have a wavelength of 100 mm. The super high frequency (SHF) band ranges from 3 GHz to 30 GHz and is also known as centimeter waves. Communications using mmW / near-mmW RF bands (e.g., 3 GHz to 300 GHz) have extremely high path loss and short coverage. Beamforming 182 can be used between mmW base station 180 and UE 104 to compensate for the extremely high path loss and short coverage.

[0032] Base station 180 may transmit beamformed signals in one or more transmit directions 108 a to UE 104. UE 104 may receive beamformed signals from base station 180 in one or more receive directions 108 b. UE 104 may also transmit beamformed signals in one or more transmit directions to base station 180. Base station 180 may receive beamformed signals in one or more receive directions from UE 104. Base station 180 / UE 104 may perform beam training to determine the optimal transmit and receive directions for each base station 180 / UE 104. The transmit and receive directions of base station 180 may be the same or different. The transmit and receive directions of UE 104 may be the same or different.

[0033] The EPC 160 may include a mobility management entity (MME) 162, other MMEs 164, a serving gateway 166, an MBMS gateway 168, a broadcast multicast service center (BM-SC) 170, and a packet data network (PDN) gateway 172. The MME 162 may communicate with a home subscriber server (HSS) 174. The MME 162 is a control node that handles signaling between the UE 104 and the EPC 160. Typically, the MME 162 provides bearer and connection management. All user Internet protocol (IP) packets are passed through the serving gateway 166, which itself is connected to the PDN gateway 172. The PDN gateway 172 provides UE IP address allocation and other functions. The PDN gateway 172 and the BM-SC 170 are connected to the IP services 176. The IP services 176 may include the Internet, an intranet, an IP multimedia subsystem (IMS), a packet-switching streaming service (PSS), and / or other IP services. The BM-SC 170 may provide functionality for MBMS user service provision and delivery. The BM-SC 170 may serve 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 (PLMN), and may be used to schedule MBMS transmissions. The MBMS gateway 168 may be used to allocate MBMS services to base stations 102 of broadcast-specific services belonging to a multicast broadcast single frequency network (MBSFN) area, and may be responsible for session management (start / stop) and collecting payment information related to evolved MBMS (eMBMS).

[0034] The core network 190 may include an access and mobility management function (AMF) 192, other AMFs 193, a location management function (LMF) 198, a session management function (SMF) 194, and a user plane function (UPF) 195. The AMF 192 may communicate with the unified data management (UDM) 196. The AMF 192 is a control node that handles signaling between the UE 104 and the core network 190. Typically, the SMF 194 provides QoS flow and session management. All user Internet protocol (IP) data packets pass through the UPF 195. The UPF 195 provides UE IP address allocation and other functions. The UPF 195 connects to the IP services 197. The IP services 197 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS), PS streaming services, and / or other IP services.

[0035] A base station may also be referred to as a gNB, Node B (NB), eNB, AP, base transceiver station, radio base station, radio transceiver, transceiver functionality, basic service set (BSS), extended service set (ESS), transmit reception point (TRP), or other appropriate terminology. Base station 102 provides an access point to EPC 160 and core network 190 for UE 104. Examples of UE 104 include a cellular phone, a smartphone, a Session Initiation Protocol (SIP) phone, a laptop, a personal digital assistant (PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., an MP3 player), a camera, a game console, a tablet computer, a smart device, a wearable device, an automobile, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor / actuator, a display, or any other similarly functional device. Some UEs 104 may also be referred to as IoT devices (e.g., parking meters, gas pumps, ovens, cars, heart monitors, etc.). A UE 104 may also be referred to as a station, a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile user station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile user, a user, or other suitable terminology.

[0036] Although the present invention may refer to 5G New Radio (NR), the present invention may be applicable to other similar fields, such as LTE, LTE-Advanced (LTE-A), Code Division Multiple Access (CDMA), Global System for Mobile communications (GSM), or other wireless / radio access technologies.

[0037] Figure 2This is a block diagram of communication between base station 210 and UE 250 in an access network. In the DL, IP packets from core network 160 or core network 190 may be provided to controller / processor 275. Controller / processor 275 implements Layer 3 and Layer 2 functions. Layer 3 includes the radio resource control (RRC) layer, and Layer 2 includes the packet data convergence protocol (PDCP), radio link control (RLC), and medium access control (MAC). The controller / processor 275 provides RRC layer functions, PDCP layer functions, RLC layer functions, and MAC layer functions. The RRC layer functions are associated with system information (e.g., MIB, SIB) broadcast, RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release), inter-Radio Access Technology (RAT) mobility, and measurement configuration for UE measurement reporting. The PDCP layer functions are associated with header compression / decompression, security (ciphering, deciphering, integrity protection, integrity verification), and handover support. The RLC layer functions are associated with delivery of upper layer packet data units (PDUs), error correction through ARQ, concatenation, segmentation, and reassembly of RLC service data units (SDUs), and RLC data packet data unit (PDU). The MAC layer functions are associated with the re-segmentation of RLC data unit (PDU) and the reordering of RLC data PDUs; the MAC layer functions are associated with the mapping between logical channels and transport channels, multiplexing of MAC SDUs on transport blocks (TBs), demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority processing, and logical channel prioritization.

[0038] The transmit (TX) processor 216 and receive (RX) processor 270 implement layer 1 functions associated with various signal processing functions. Layer 1, including the physical (PHY) layer, can include error detection on the transmission channel, forward error correction (FEC) encoding / decoding of the transmission channel, interleaving, rate matching, mapping on the physical channel, modulation / demodulation of the physical channel, and MIMO antenna processing. The TX processor 216 processes the mapping to the signal 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-QAM)). The coded and modulated symbols can then be separated into parallel streams. Each stream can then be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., a pilot) in the time and / or frequency domain, and then combined using an inverse fast Fourier transform (IFFT) to produce a physical channel carrying a time-domain OFDM symbol stream. The OFDM stream is spatially precoded to produce multiple spatial streams. Channel estimates from a channel estimator 274 can be used to determine the coding and modulation scheme, as well as for spatial processing. The channel estimate can be derived from a reference signal and / or channel state feedback transmitted by the UE 250. Each spatial stream can then be provided to a different antenna 220 via a transmitter 218TX in each transmitter and receiver 218. Each transmitter 218TX can modulate an RF carrier using a corresponding spatial stream for transmission.

[0039] In UE 250, each receiver 254RX (transceiver 254 includes receiver 254RX and transmitter 254TX) receives signals via a corresponding antenna 252. Each receiver 254RX recovers the information modulated onto the RF carrier and provides this information to RX processor 256. TX processor 268 and RX processor 256 implement Layer 1 functions associated with various signal processing functions. RX processor 256 performs spatial processing on the information to recover any spatial streams destined for UE 250. If multiple spatial streams are destined for UE 250, they may be combined into a single OFDM symbol stream by RX processor 256. RX processor 256 then converts the OFDM symbol stream from the time domain to the frequency domain using a fast Fourier transform (FFT). The frequency domain signal includes a separate OFDM symbol stream for each subcarrier of the OFDM signal. Symbols and reference signals on each subcarrier are recovered and demodulated by determining the most likely signal constellation point transmitted by base station 210. Soft decisions are made based on the channel estimate calculated by channel estimator 258. The soft decisions are then decoded and deinterleaved to recover the data and control signals originally transmitted on the physical channel by base station 210. The data and control signals are then provided to controller / processor 259, which performs layer 3 and layer 2 functions.

[0040] The controller / processor 259 may be associated with a memory 260 that stores program codes and data. Memory 260 may also be referred to as a computer-readable medium. In the UL, the controller / processor 259 provides demultiplexing between transport and logical channels, packet reassembly, decryption, header decompression, and control signal processing to recover IP packets from the EPC 160 or core network 190. The controller / processor 259 is also responsible for error detection using ACK and / or NACK protocols to support HARQ operations.

[0041] Similar to the functional description related to DL transmission of 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 reporting; the PDCP layer functions are associated with header compression / decompression, security (encryption, decryption, integrity protection, integrity verification); the RLC layer functions are associated with the delivery of upper layer PDUs, error correction through ARQ, concatenation, segmentation and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; the MAC layer functions are associated with mapping between logical channels and transport channels, MAC SDU multiplexing on TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority processing, and logical channel prioritization.

[0042] The TX processor 268 may use channel estimates derived from a reference signal or feedback transmitted by the base station 210 by the channel estimator 258 to select an appropriate coding and modulation scheme and to facilitate spatial processing. The spatial streams generated by the TX processor 268 may be provided to different antennas 252 via respective transmitters 254TX. Each transmitter 254TX may modulate an RF carrier for transmission using a corresponding spatial stream. UL transmissions are processed in the base station 210 in a manner similar to the receiver functionality in the connected UE 250. A receiver 218RX in each transmitter and receiver 218 receives a signal via a corresponding antenna 220. Each receiver 218RX recovers the information modulated onto the RF carrier and provides the information to the RX processor 270.

[0043] The controller / processor 275 may be associated with a memory 276 for storing program codes and data. The 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, decryption, header decompression, and control signal processing to recover IP packets from the UE 250. The IP packets from the controller / processor 275 may be provided to the core network 160 or the core network 190. The controller / processor 275 is also responsible for error detection using ACK and / or NACK protocols to support HARQ operations.

[0044] NR refers to a radio configured to operate according to a new air interface (e.g., in addition to an OFDMA-based air interface) or a fixed transport layer (e.g., in addition to IP). NR may use OFDM with a cyclic prefix (CP) in both UL and DL, and may include support for half-duplex operation using time division duplexing (TDD). NR may include missions for enhanced mobile broadband (eMBB) services for wide bandwidths (e.g., over 80 MHz), millimeter wave (mmW) for high carrier frequencies (e.g., 60 GHz), massive MTC (mMTC) for non-backward-compatible machine type communication (MTC) technologies, and / or for ultra-reliable low latency communication (URLLC) services.

[0045] A single component carrier bandwidth of 100 MHz can be supported. In one example, an NR RB can span 12 subcarriers with a subcarrier bandwidth of 60 kHz in 0.25 ms duration or a subcarrier bandwidth of 30 kHz in 0.5 ms duration (similarly, 50 MHz BW for 15KHz SCS in 1 ms duration). Each radio frame can include 10 subframes (10, 20, 40, or 80 NR time slots) with a length of 10 ms. Each time slot can indicate the link direction (e.g., DL or UL) used for data transmission, and the link direction of each time slot can be switched dynamically. Each time slot can include DL / UL data and DL / UL control data. About Figure 5 and Figure 6 The UL and DL time slots for NR may be described in more detail below.

[0046] NR RAN may include a central unit (CU) and a distributed unit (DU). NR base stations (e.g., gNB, 5G Node B, Node B, transmission reception point (TRP), AP) may correspond to one or more base stations. NR cells may be configured as access cells (ACell) or data-only cells (DCell). For example, the RAN (e.g., a central unit or a distributed unit) may configure the cell. DCell may be a cell for carrier aggregation or dual connectivity and may not be used for initial access, cell selection / reselection, or handover. In some cases, the Dcell may not send a synchronization signal (SS). In some cases, the DCell may send an SS. The NR BS may send a DL signal to the UE to indicate the cell type. Based on the cell type instruction, the UE may communicate with the NR BS. For example, the UE may determine the NR base station based on the indicated cell type to consider for cell selection, access, handover, and / or measurement.

[0047] Figure 3An example logical architecture of a distributed RAN 300 is shown according to various aspects of the present invention. A 5G access node (AN) 306 may include an access node controller (ANC) 302. The ANC may be the central unit (CU) of the distributed RAN 300. The backhaul interface to the next generation core network (NG-CN) 304 may terminate at the ANC. The backhaul interface to the adjacent next generation access node (NG-AN) 310 may terminate at the ANC. The ANC may be associated with one or more TRPs 308 (also referred to as base stations, NR base stations, node Bs, 5G node Bs, APs, or some other terms) via the F1 control plan protocol (F1-C) / F1 user plan protocol (F1-U). As described above, TRP may be used interchangeably with "cell."

[0048] The TRP 308 may be a distributed unit (DU). The TRP may be connected to one ANC (ANC 302) or more than one ANC (not shown). For example, for RAN sharing, radio as a service (RaaS), and service-specific ANC deployments, the TRP may be connected to more than one ANC. The TRP may include one or more antenna ports. The TRP may be configured to provide services to the UE independently (e.g., dynamically selected) or jointly (e.g., for joint transmission).

[0049] The partial architecture of the distributed RAN 300 can be used to illustrate the fronthaul definition. The architecture can be defined to support fronthaul solutions across different deployment types. For example, the architecture can be based on transport network capabilities (e.g., bandwidth, latency, and / or jitter). The architecture can share features and / or components with LTE. According to various aspects, the NG-AN 310 can support dual connectivity with NR. The NG-AN can share a shared fronthaul for LTE and NR.

[0050] The architecture can enable collaboration between TRPs 308. For example, collaboration can be pre-set within a TRP and / or across TRPs via ANC 302. According to various aspects, an inter-TRP interface may not be required / present.

[0051] According to various aspects, dynamic configuration of separate logical functions can be implemented within the distributed RAN 300 architecture. PDCP, RLC, and MAC protocols can be adaptively placed in the ANC or TRP.

[0052] Figure 4 An example physical architecture of a distributed RAN 400 is shown according to aspects of the present invention. A centralized core network unit (C-CU) 402 can host core network functions. The C-CU can be deployed in a centralized manner. C-CU functions can be offloaded (e.g., to an advanced wireless service (AWS)) to handle peak capacity. A centralized RAN unit (C-RU) 404 can host one or more ANC functions. Optionally, the C-RU can host core network functions locally. The C-RU can be deployed in a distributed manner. The C-RU can be closer to the edge of the network. The DU 406 can host one or more TRPs. The DU can be located at the edge of the network with RF functions.

[0053] Figure 5 5 is a diagram illustrating an example of a DL-centric time slot. The DL-centric time slot may include a control portion 502. The control portion 502 may be present at the beginning or start of the DL-centric time slot. The control portion 502 may include various scheduling information and / or control information corresponding to various portions of the DL-centric time slot. In some configurations, the control portion 502 may be a PDCCH, such as Figure 5 As shown in FIG, a DL-centric time slot may also include a DL data portion 504. The DL data portion 504 may sometimes be referred to as the payload of the DL-centric time slot. The DL data portion 504 may include communication resources for transmitting DL data from a scheduling entity (e.g., a UE or a BS) to a subordinate entity (e.g., a UE). In some configurations, the DL data portion 504 may be a PDSCH.

[0054] The DL-centric timeslot may also include a common UL portion 506. The common UL portion 506 may sometimes be referred to as a UL burst, a shared UL burst, and / or various other suitable terms. The common UL portion 506 may include feedback information corresponding to various other portions of the DL-centric timeslot. For example, the common UL portion 506 may include feedback information corresponding to the control portion 502. Non-limiting examples of feedback information may include an ACK signal, a NACK signal, a HARQ indicator, and / or various other suitable types of information. The common UL portion 506 may include additional or alternative information, such as information about a random access channel (RACH) process, a scheduling request (SR), and various other suitable types of information.

[0055] like Figure 5 As shown, the end of the DL data portion 504 can be separated in time from the beginning of the common UL portion 506. This time interval may sometimes be referred to as a gap, a guard period, a guard interval, and / or various other suitable terms. This interval provides time for switching from DL communication (e.g., reception by a subordinate entity (e.g., a UE)) to UL communication (e.g., transmission by a subordinate entity (e.g., a UE)). Those skilled in the art will appreciate that the foregoing is merely an example of a DL-centric time slot, and that alternative structures with similar features may exist without departing from the various aspects described herein.

[0056] Figure 6 6 is a diagram illustrating an example of a UL-centric time slot. The UL-centric time slot may include a control portion 602. The control portion 602 may be present at the beginning or start of the UL-centric time slot. Figure 6 The control portion 602 in the embodiment may be similar to the control portion 602 in the embodiment Figure 5 The control portion 502 is described. The UL-centric time slot may also include a UL data portion 604. The UL data portion 604 may sometimes be referred to as the payload of the UL-centric time slot. The UL portion refers to the communication resources used to transmit UL data from a lower-level entity (e.g., a UE) to a scheduling entity (e.g., a UE or a BS). In some configurations, the control portion 602 may be a PDCCH.

[0057] like Figure 6As shown, the end of the control portion 602 can be separated in time from the beginning of the UL data portion 604. This time interval may sometimes be referred to as a gap, a guard period, a guard interval, and / or various other suitable terms. This interval provides time for switching from DL communication (e.g., receiving operation of the scheduling entity) to UL communication (e.g., transmission of the scheduling entity). The UL-centric timeslot may also include a common UL portion 606. Figure 6 The shared UL portion 606 in the example is similar to the above example. Figure 5 The common UL portion 506 is described. The common UL portion 606 may additionally or alternatively include information regarding CQI, SRS, and various other suitable types of information. Those skilled in the art will appreciate that the foregoing is merely an example of a UL-centric time slot, and that alternative structures with similar features may exist without departing from the various aspects described herein.

[0058] In some cases, two or more subordinate entities (e.g., UEs) can communicate with each other using sidelink signals. Practical applications of such sidelink communications may include public safety, proximity services, UE-to-network relaying, vehicle-to-vehicle (V2V) communications, Internet of Everything (IoE) communications, IoT communications, mission-critical meshes, and / or various other suitable applications. Generally, a sidelink signal refers to a signal transmitted from one subordinate entity (e.g., UE1) to another subordinate entity (e.g., UE 2) without the need for relaying the communication through a scheduling entity (e.g., UE or BS), even if the scheduling entity may be used for scheduling or control purposes. In some examples, licensed spectrum can be used to transmit sidelink signals (unlike wireless local area networks that typically use licensed spectrum).

[0059] Figure 7 7 is a diagram illustrating CSI reporting from a UE to a base station. A base station 702 and a UE 704 communicate on a channel 710. The base station 702 can transmit a spatial beam 740 on the channel 710. The channel properties of the channel 710 (i.e., the wireless communication link) are referred to as channel state information 714. This information describes how the signal propagates from the transmitter at the base station 702 to the receiver at the UE 704 and represents the combined effects of scattering, multipath fading, signal power attenuation with distance, etc. Knowledge of the channel state information 714 at the transmitter and / or receiver can enable data transmission to adapt to the current channel conditions, which is critical for achieving reliable and robust communication at high data rates in multi-antenna systems. The channel state information 714 typically needs to be estimated at the receiver and is typically quantized and fed back to the transmitter.

[0060] The time and frequency resources that the UE 704 can use to report channel state information 714 are controlled by the base station 702. The channel state information 714 may include CQI, PMI, CSI-RS resource indicator (CRI), SS block resource indicator, layer indicator (L1), rank indicator (RI), and / or L1-RSRP measurement. For CQI, PMI, CRI, L1, RI, L1-RSRP, the UE 704 may be configured via RRC signaling with more than one CSI report configuration (CSI-reportConfig) report setting, CSI resource configuration (CSI-ResourceConfig) resource setting, and one or two trigger state lists to indicate a channel resource set ID and an optional interference measurement resource set ID. Each trigger state includes an associated CSI-ReportConfig.

[0061] UE 704 uses the CSI-RS transmitted from the base station 702's transmit antenna ports to measure the spatial channel between itself and the serving base station to generate a CSI report. UE 704 then calculates CSI-related metrics and reports the CSI to base station 702. Using the reported CSI from all UEs, base station 702 performs link adaptation and scheduling. The goal of CSI measurement and reporting is to obtain an approximation of the CSI. This can be achieved when the reported PMI accurately represents the primary channel eigenvector, thereby enabling accurate beamforming.

[0062] NR supports multiple types of spatial-resolution CSI, including standard resolution (Type I) and high resolution (Type II). Low-resolution CSI is targeted at SU-MIMO transmissions because it relies on the UE receiver to suppress inter-layer interference. This is possible because the number of receive layers is less than the number of receiver antennas for a given UE. For MU-MIMO transmissions, the number of receive layers is typically greater than the number of receive antennas for the UE. The base station uses beamforming / precoding to suppress interference between UEs. Therefore, capturing higher-resolution CSI that covers more channel propagation paths requires sufficient degrees of freedom at the transmitter.

[0063] For high spatial resolution (Type II) CSI, a linear combination codebook can be used to support two layers of feedback. The codebook resolution is high enough to facilitate a sufficiently accurate approximation of the downlink channel. In this scheme, the UE reports a PMI representing a linear combination of multiple beams. Both Type I (type-I) CSI and Type II (type-II) CSI use a two-stage W=W1W2 codebook, where W1 is a wideband precoder representing the selected spatial vector basis, W2 for Type I CSI represents further basis selection and / or co-phase angle, and for Type II CSI represents the linear combination coefficient corresponding to the selected spatial basis.

[0064] In some configurations, the channel 710 between the base station 702 and the UE 704 has a rank R. The frequency of the channel 710 can be divided into a plurality of sub-bands or frequency bins. The frequency bins can range from 1 to F. total Index. The precoder W of rank r and frequency unit index f can be written as:

[0065]

[0066] Where B=[b1 … b l … b L ]. L is the number of fundamental beams 742 in each polarization direction; each b i is the spatial beam selected for each polarization in a wideband manner, where 1≤i≤L. A total of 2L spatial beams are selected for both polarizations. r is the spatial layer index, 1≤r≤R; f is the frequency index (e.g., subband index or PRB index), 1≤f≤F total , where F total is the total number of frequency units (subbands, PRBs, etc.) to which CSI feedback is applicable, for example, 16 or 19.

[0067] In order to reduce the feedback load of the Type-II codebook, another "enhanced Type-II codebook" is introduced by compressing the CSI report in the frequency domain. The precoder for the spatial layer r of all frequency indices 1≤f≤N3 in the segment can be written as:

[0068]

[0069] as well as

[0070]

[0071] Where N3 is the number of subbands (or frequency bins) used for CSI feedback, or equivalently the maximum number of delay taps in the time domain formula, and O3 is the oversampling factor. M delay taps (or FD components) are used in the approximation; the role of O3 is best understood in the time domain formula because it is expressed by o3 (0≤o3≤O 3-1 ) provides a finer timing unit for the delay tap.

[0072] Figure 8 Schematic diagram 800 illustrates CSI reporting from UE 704 to base station 702. The channel state of UE 704 may be defined by a CSI parameter set, the values ​​of which specify the channel state. The aforementioned CSI parameters, such as CQI, PMI, CRI, LI, RI, and L1-RSRP, may be used to indicate the values ​​of the CSI parameters. Furthermore, UE 704 may send one or more CSI reports to base station 702. Each CSI report may include one or more of CQI, PMI, CRI, LI, RI, and L1-RSRP, thereby informing base station 702 of the channel state at UE 704.

[0073] In this example, according to the techniques described below, at time t1, UE 704 performs a set of CSI measurements and then generates a complete CSI report A based on these measurements. Subsequently, at time t1′, UE 704 sends the complete CSI report A to base station 702. Similarly, UE 704 performs a second set of measurements at time t2 and may send a corresponding differential CSI report B at time t2′; UE 704 performs a third set of measurements at time t3 and may send a corresponding differential CSI report C at time t3′.

[0074] More specifically, in the first technique, the UE 704 and the base station 702 share a prediction model for estimating the value of the CSI parameter. The UE 704 can generate the prediction model and then send the prediction model to the base station 702. Alternatively, the network can configure the prediction model for both the base station 702 and the UE 704. In this example, there are Q CSI parameters v1, v2, ..., v o , which can be vectorized into a vector V:

[0075]

[0076] Furthermore, V(s) represents the Q CSI parameters v1, v2, ..., v at the s-th time point when the CSI measurement set is performed. Q The value of . S is an integer greater than 1. The prediction model can be written as:

[0077]

[0078] is the predicted value. V is the known value. K is an integer greater than 0 and less than s. s-i is the coefficient corresponding to V(si). In one example, s=4, K=2, and the prediction model is:

[0079]

[0080] As previously mentioned, the precoding matrix W can be written as W = W1 × W2. In some cases, the value of W1 may change more slowly than the value of W2. For example, within a given duration, the percentage change in the value of W2 may be greater than the percentage change in the value of W1. Therefore, the UE 704 may report W1 and W2 separately and may report W2 more frequently than W1.

[0081] In one example, the above precoding matrix W2 can be represented by V: v1 can be v2 can be Etc. 2(t) represents the value of W2 at time point t. W2 can be selected from a type I codebook, a type II codebook, an enhanced type II codebook, etc. At time point t1, UE 704 performs a set of CSI measurements and determines W2(t1). Therefore, UE 704 can generate V(t1). At time point t1', UE 704 sends a complete CSI report A, which includes an indicator (e.g., PMI) indicating the value of W2(t1). Base station 702 receives the indicator and can derive the value of W2(t1) based on it. Therefore, base station 702 can generate V(t1).

[0082] Subsequently, at time t2, UE 704 performs another set of CSI measurements and determines the value of W2(t2). UE 704 may generate V(t2). Further, in this example, K is 2. Using the prediction model (i.e., ), UE 704 can calculate based on V(t1) UE 704 can further calculate V(t2) and The difference between .

[0083] UE 704 may determine the non-zero elements of ΔV(t2) and generate a variation indicator indicating those non-zero elements of ΔV(t2). Subsequently, at time t2', UE 704 transmits a differential CSI report B including the variation indicator to base station 702 instead of a complete CSI report. Therefore, in certain situations where the number of non-zero elements is limited and the variation of the elements of ΔV(t2) is also limited, the information bits used to carry the variation indicator may be substantially less than the information bits required to carry the PMI indicating W2, thereby reducing the resources required to transmit the CSI report.

[0084] Once the change indicator is received via the differential CSI report B, the base station 702 can derive ΔV(t2) based on the change indicator. Using a prediction model with K equal to 2 (ie, ), the base station 702 can calculate based on the previously obtained V(t1) Therefore, base station 702 can calculate Furthermore, based on V(t2), the base station 702 may derive a value of W2(t2).

[0085] Subsequently, at time t3, UE 704 performs another set of CSI measurements and determines the value of W2(t3). Thus, UE 704 can generate V(t3). Furthermore, using a prediction model with K equal to 2 (i.e., ), UE 704 can calculate based on V(t1) and V(t2) UE 704 can calculate V(t3) and The difference between:

[0086]

[0087] UE 704 may determine the non-zero ΔV(t3) elements and generate a change indicator indicating those non-zero ΔV(t3) elements. Subsequently, at time t3′, UE 704 sends a differential CSI report C including the change indicator to base station 702.

[0088] Once the change indicator is received via the differential CSI report C, the base station 702 can derive ΔV(t3) based on the change indicator. Using a prediction model with K equal to 2 (ie, ), the base station 702 can calculate based on the previously obtained V(t2) and V(t1) Therefore, base station 702 can calculate Furthermore, based on V(t3), the base station 702 can derive the value of W2(t3).

[0089] In the second technique, UE 704 and base station 702 do not use the prediction model of the first technique. As described above, at time t1, UE 704 performs a set of CSI measurements and determines W2(t1). At time t1′, UE 704 sends a complete CSI report A, which includes an indicator (e.g., PMI) indicating W2(t1). Base station 702 receives the indicator and can therefore derive W2(t1).

[0090] In a first configuration of the second technique, the UE 704 may be configured to use a Type II codebook or an enhanced Type II codebook to determine W2 (类型II)(t1). Subsequently, at time point t2, UE 704 performs another set of CSI measurements and determines W2 based on the Type II codebook. (类型II) (t2). UE 704 can calculate W2 (类型-II) (t1) and W2 (类型-II) The difference between (t2):

[0091] ΔW2(t2)=W2 (类型-II) (t2)-W2 (类型-II) (t1)

[0092] UE 704 may determine the non-zero elements of ΔW2(t2) and generate a change indicator indicating those non-zero elements of ΔW2(t2). Subsequently, at time t2', UE 704 sends a differential CSI report B including the change indicator to base station 702.

[0093] Once the change indicator is received via the differential CSI report B, the base station 702 can deduce ΔW2(t2) based on the change indicator. The base station 702 also obtains W2 based on the complete CSI report A. (类型-II)( t1). Therefore, the base station 702 can calculate W2 (类型-II) (t2) = W2 (类型-II) (t1)+ΔW2(t2).

[0094] In a second configuration of the second technique, the UE 704 may be configured to determine W2(Type I) using a Type I codebook (t1). Subsequently, at time t2, the UE 704 performs another set of CSI measurements and determines W2 based on the Type II codebook. (类型-II) (t2). UE 704 may determine W2 (类型-II) (t2) and W2 (类型-I) The difference between (t1):

[0095] ΔW2(t2)=W2 (类型-II) (t2)-W2 (类型-I) (t1)

[0096] ΔW2(t2) includes the (类型-II) (t2) and W2 (类型-I) (t1) The elements in both and in W2 (类型-II) In (t2) but not in W2 (类型-I) UE 704 may determine the non-zero ΔW2(t2) elements and generate a change indicator indicating those non-zero ΔW2(t2) elements. Subsequently, at time t2′, UE 704 sends a differential CSI report B including the change indicator to base station 702.

[0097] Once the change indicator is received via the differential CSI report B, the base station 702 can deduce ΔW2(t2) based on the change indicator. The base station 702 also obtains W2 based on the complete CSI report A. (类型-I) (t1). Therefore, the base station 702 can calculate W2 (类型-II) (t2) = W2 (类型-I) (t1)+ΔW2(t2).

[0098] Figure 9 FIG. 9 is a diagram illustrating the second technique for CSI reporting described above. In an example of a second configuration of the second technique, the UE 704 is configured to use an enhanced type II codebook to determine W2 associated with the two-dimensional space 910. (eType-II) , where the two-dimensional space 910 has an X-axis delay dimension and a Y-axis spatial dimension. The X-axis has delay indices τ0, τ1, τ2, τ3, ... indicating different delay periods. The Y-axis has spatial indices α0, α1, α2, α3, ... indicating different spatial positions.

[0099] refer to Figure 8 Using the example described above, UE 704 performs a set of CSI measurements at time t1. Based on the measurement results, UE 704 determines that the signal (or pulse) received from the beam with a delay period τ0 at position α3 is the best. Therefore, UE 704 uses the enhanced type II codebook to determine W2 (eType-II) (t1), which corresponds to α3 and τ0 in the two-dimensional space 910. UE 704 sends a complete CSI report A at time t1′, including indication W2 (eType-II) (t1) indicator (e.g., PMI). The base station 702 receives the indicator and can therefore derive W2 (eType-II) (t1).

[0100] Subsequently, at time t2, UE 704 performs another set of CSI measurements. Based on the measurement results, UE 704 determines that the signal (or pulse) received from the beam at position α1 with a delay period τ1 is the best. Therefore, UE 704 determines W2 based on the measurement. (eType-II) (t2). Further, UE 704 can calculate W2 (eType-II) (t2) and W2^ (eType-II) The difference between (t1):

[0101] ΔW2(t2)=W2 (eType-II) (t2)-W2 (eType-II) (t1)

[0102] ΔW2(t2) specifies the spatial index of the best signal / pulse shifted downward along the Y axis by [α3-α1] and the delay index of the best signal / pulse shifted right along the X axis by [τ1-τ0]. ΔW2(t2) may also specify the amplitude / phase change from t1 to t2. Thus, at time point t2', UE 704 may send a differential CSI report B including a change indicator indicating a change in the spatial index and a change in the delay index. Upon receiving the change indicator via differential CSI report B, base station 702 may derive ΔW2(t2) based on the change indicator. Base station 702 also obtains W2 based on the complete CSI report A. (eType-II) (t1). Therefore, the base station 702 can calculate W2 (eType-II) (t2) = W2 (eType-II) (t1)+ΔW2(t2).

[0103] Subsequently, at time point t3, UE 704 performs another set of CSI measurements. Based on the measurements, UE 704 determines that the signals (or pulses) received from beams at positions α1 and α2 with a delay period τ1 are optimal. Therefore, UE 704 determines W2 (eType-II) (t3). Further, UE 704 can calculate W2 (eType-II) (t3) and W2^ (eType-II) The difference between (t2):

[0104] ΔW2(t3)=W2 (eType-II) (t3)-W2 (eType-II) (t2)

[0105] ΔW2(t3) specifies the spatial index of the best signal / pulse that moves upward along the Y axis by [α2-α1] on one path and remains unchanged on the other path. ΔW2(t3) also specifies the delay index of the best signal / pulse that remains the same on both paths. Therefore, at time point t2', UE 704 can send a differential CSI report C including a change indicator indicating a change in the spatial index and a change in the delay index. Once the change indicator is received through the differential CSI report C, the base station 702 can derive ΔW2(t3) based on the change indicator. The base station 702 also obtains W2 based on the differential CSI report B. (eType-II) (t2). Therefore, the base station 702 can calculate W2 (eType-II) (t3)=W2∧ (eType-II) (t2)+ΔW2(t3).

[0106] Additionally, other features may be employed to indicate to the base station 702 and / or the UE 704 whether differential CSI reporting may be used. Figure 8In the first feature, after successfully receiving the complete CSI report A at time point t1, the base station 702 may 11 Send aperiodic CSI (A-CSI) trigger. At time point t 11 The A-CSI trigger of indicates to UE 704 that base station 702 has successfully received the complete CSI report A and UE 704 can then send a differential CSI report B. Therefore, as described above, at time point t2′ UE 704 sends differential CSI report B. After sending the complete CSI report A, UE 704 sends the differential CSI report B at time point t 11 Alternatively, when no A-CSI trigger is received within a predetermined duration, UE 704 may determine that base station 702 has not successfully received the complete CSI report A. Therefore, UE 704 determines to send another complete CSI report including PMI (instead of differential CSI report B) to base station 702 at time t2′.

[0107] In the second feature, after receiving each CSI report, the base station 702 may send an ACK or NACK to the UE 704 to confirm whether the base station 702 has successfully received the CSI report. The ACK / NACK may be carried in the PDCCH, PDSCH, or MAC CE. In this example, after receiving the complete CSI report A at time point t1', the base station 702 determines that the base station 702 has successfully received the complete CSI report A. Subsequently, at time point t 11 , the base station 702 sends an ACK to the UE 704. After knowing that the base station 702 has successfully received the complete CSI report A, the UE 704 can send the differential CSI report B at time t2', as described above.

[0108] In the third feature, the UE 704 includes in each CSI report an indicator indicating whether the CSI report is a full CSI report or a differential CSI report. In addition, when the CSI report is a differential CSI report, the UE 704 may also include in the differential CSI report an identifier that identifies a previous report, and the change indicator is calculated based on the previous report. For example, in Figure 8 In the example of , the UE 704 may include identifiers identifying the differential CSI report B and the full CSI report A in the differential CSI report C, and calculate a change indicator included in the differential CSI report C based on the differential CSI report B and the full CSI report A.

[0109] Figure 101000 is a flow chart of a method (process) for performing CSI reporting. The method may be performed by a UE (e.g., UE 704, apparatus 1102, and apparatus 1102′). In one configuration, in operation 1002, the UE may notify the network of a prediction model. The prediction model may generate a reference value set by performing a linear combination on one or more sets of prior values ​​corresponding to a CSI parameter set. Specifically, the reference value set is generated by the prediction model at a first time point based on one or more sets of prior values ​​at one or more time points before the first time point. The CSI parameter set includes a CSI component corresponding to a predefined codebook type.

[0110] At operation 1004, the UE measures a second reference signal set at a second time point prior to the first time point to determine a second set of values ​​corresponding to the CSI parameter set. The one or more sets of previous values ​​include the second set of values. At operation 1006, the UE generates a third set of values ​​corresponding to a third time point prior to the first time point based on the prediction model. A set of previous values ​​is derived from the third set of values. The UE then proceeds to operation 1020.

[0111] In another configuration, at operation 1012, the UE measures a second reference signal set at a second time point prior to the first time point to determine a second set of values ​​corresponding to the CSI parameter set based on the codebook. The second set of values ​​is used as a reference value set. At operation 1014, the UE transmits a second CSI report including an indicator indicating the second set of values. The UE then proceeds to operation 1020.

[0112] At operation 1020, the UE measures a first reference signal set at a first point in time to determine a first set of values ​​corresponding to a CSI parameter set. At operation 1022, the UE determines a difference between the first set of values ​​and a reference value set corresponding to the CSI parameter set. At operation 1024, the UE transmits a first CSI report including a change indicator indicating the difference.

[0113] In certain configurations, the UE receives an indication via a control channel indicating a desire to transmit the difference value, wherein the first CSI report is transmitted in response to receiving the indication. In certain configurations, the UE receives a confirmation that the first CSI report has been correctly received at the base station. In certain configurations, the UE transmits an indication indicating that the difference value is included in the first CSI report. In certain configurations, the UE transmits an indication indicating the identity of the reference CSI report that has been transmitted.

[0114] Figure 111 is a schematic diagram 1100 illustrating an example of a hardware implementation for an apparatus 1102′ employing a processing system 1114. Apparatus 1102′ may be a UE. Processing system 1114 may be implemented using a bus architecture (generally represented by bus 1124). Depending on the specific application and overall design constraints of processing system 1114, bus 1124 may include any number of interconnecting buses and bridges. Bus 1124 links together various circuits, including one or more processors and / or hardware components (represented by one or more processors 1104, receiving component 1164, transmitting component 1170, CSI measurement component 1176, change calculation component 1178, CSI reporting component 1182, and computer-readable medium / memory 1106). Bus 1124 may also link various other circuits (e.g., timing sources, peripherals, voltage regulators, and power management circuits, etc.).

[0115] The processing system 1114 can be coupled to a transceiver 1110, which can be one or more of the transceivers 254. The transceiver 1110 is coupled to one or more antennas 1120, which can be communication antennas 252.

[0116] The transceiver 1110 provides a means for communicating with various other devices over a transmission medium. The transceiver 1110 receives signals from one or more antennas 1120, extracts information from the received signals, and provides the extracted information to the processing system 1114, specifically the receiving component 1164. In addition, the transceiver 1110 receives information from the processing system 1114, specifically the transmitting component 1170, and generates signals to be applied to the one or more antennas 1120 based on the received information.

[0117] Processing system 1114 includes one or more processors 1104 coupled to computer-readable media / memory 1106. The one or more processors 1104 are responsible for overall processing, including executing software stored on computer-readable media / memory 1106. This software, when executed by the one or more processors 1104, enables processing system 1114 to perform the various functions described above for any particular device. The computer-readable media / memory 1106 may also be used to store data that is manipulated by the one or more processors 1104 when executing the software. Processing system 1114 also includes at least one of a receiving component 1164, a transmitting component 1170, a CSI measurement component 1176, a variance calculation component 1178, and a CSI reporting component 1182. These components may be software components running on the one or more processors 1104, resident / stored in the computer-readable media / memory 1106, one or more hardware components coupled to the one or more processors 1104, or some combination thereof. The processing system 1114 may be a component of the UE 250 and may include the memory 260 and / or at least one of the TX processor 268 , the RX processor 256 , and the controller / processor 259 .

[0118] In one configuration, the apparatus 1102 / 1102' for wireless communication includes a method for performing Figure 10 The aforementioned means may be one or more of the aforementioned components of the device 1102 and / or the processing system 1114 of the device 1102 ′ configured to perform the functions recited by the aforementioned means.

[0119] As described above, the processing system 1114 may include the TX processor 268, the RX processor 256, and the controller / processor 259. Thus, in one configuration, the aforementioned means may be the TX processor 268, the RX processor 256, and the controller / processor 259 configured to perform the functions recited by the aforementioned means.

[0120] It should be understood that the specific order or hierarchy of blocks in the disclosed process / flowcharts is illustrative of exemplary methods. It should be understood that the specific order or hierarchy of blocks in the process / flowcharts may be rearranged based on design preferences. In addition, some blocks may be combined or omitted. The accompanying method claims present the elements of the various blocks in an example order and are not intended to be limited to the specific order or hierarchy presented.

[0121] The foregoing description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects. Therefore, the claims are not intended to be limited to the various aspects shown herein, but should be given a full scope consistent with the text of the claims, wherein, unless explicitly stated, references to elements in the singular are not intended to mean "one and only one", but rather "one or more". The word "exemplary" is used herein to mean "serving as an example, instance, or illustration". Any aspect described herein as "exemplary" is not necessarily to be interpreted as being preferred or advantageous over other aspects. Unless otherwise explicitly stated, the term "some" refers to one or more. Combinations such as "at least one of A, B, or C", "one or more of A, B, or C", "at least one of A, B, and C", "one or more of A, B, and C", and "A, B, C, or any combination thereof" include any combination of A, B, and / or C, and may include multiple A, multiple B, or multiple C. Specifically, phrases such as “at least one of A, B, or C,” “one or more of A, B, or C,” “at least one of A, B, and C,” “one or more of A, B, and C,” and “A, B, C, or any combination thereof” may be A only, B only, C only, A and B, A and C, B and C, or A and B and C, where 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 throughout this disclosure that are known or later come to be known to one of ordinary skill in the art are expressly incorporated herein by reference and are intended to be covered by the claims. Furthermore, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is expressly recited in the claims. The terms “module,” “mechanism,” “element,” “device,” etc. may not replace the term “means.” Therefore, no claim element should be interpreted as a means-plus-function unless the claim element is expressly recited using the phrase “means for….”

Claims

1. A method for reporting channel state information, comprising: Measuring a first reference signal set at a first time point to determine a first set of values ​​corresponding to a channel state information (CSI) parameter set; determining a difference between the first set of values ​​and a reference set of values ​​corresponding to the CSI parameter set; sending a first CSI report including a change indicator indicating the difference; as well as The reference value set for the first time point is generated by a prediction model based on multiple groups of previous values ​​corresponding to the CSI parameter set corresponding to multiple time points before the first time point.

2. The method for reporting channel state information according to claim 1, wherein: The CSI parameter set includes CSI components corresponding to a predefined codebook type.

3. The method for reporting channel state information according to claim 1, wherein: The prediction model generates the reference value set by performing a linear combination on the multiple sets of previous values.

4. The method for reporting channel state information according to claim 1, wherein: Further including: The network is informed of the prediction model.

5. The method for reporting channel state information according to claim 1, wherein: Further including: A second reference signal set is measured at a second time point prior to the first time point to determine a second set of values ​​corresponding to the CSI parameter set, wherein the plurality of sets of previous values ​​include the second set of values.

6. The method for reporting channel state information according to claim 3, wherein: Further including: Based on the prediction model, a second set of values ​​is generated for a second point in time prior to the first point in time, wherein one of the plurality of sets of previous values ​​is derived from the second set of values.

7. The method for reporting channel state information according to claim 1, wherein: Further including: A second reference signal set is measured at a second time point before the first time point to determine a second set of values ​​corresponding to the CSI parameter set based on a codebook, wherein the reference value set is the second set of values.

8. The method for reporting channel state information according to claim 7, wherein: Further including: A second CSI report including an indicator indicating the second set of values ​​is sent.

9. The method for reporting channel state information according to claim 1, wherein: Further including: An indication is received over a control channel indicating a desire to send the difference, wherein the first CSI report is sent in response to receiving the indication.

10. The method for reporting channel state information according to claim 1, wherein: Further including: An acknowledgement is received that the first CSI report has been correctly received at the base station.

11. The method for reporting channel state information according to claim 1, wherein: Further including: An indication is sent indicating that the difference is included in the first CSI report.

12. The method for reporting channel state information according to claim 1, wherein: Further including: An indication is sent indicating the identity of the reference CSI report that has been sent.

13. A device for reporting channel state information, the device being a user equipment, comprising: Memory; as well as at least one processor coupled to the memory, and the at least one processor configured to: Measuring a first reference signal set at a first time point to determine a first set of values ​​corresponding to a channel state information (CSI) parameter set; determining a difference between the first set of values ​​and a reference set of values ​​corresponding to the CSI parameter set; sending a first CSI report including a change indicator indicating the difference; as well as The reference value set for the first time point is generated by a prediction model based on multiple groups of previous values ​​corresponding to the CSI parameter set corresponding to multiple time points before the first time point.

14. The device for channel state information reporting according to claim 13, characterized in that The CSI parameter set includes CSI components corresponding to a predefined codebook type.

15. The device for channel state information reporting according to claim 13, characterized in that The prediction model generates the reference value set by performing a linear combination on the multiple sets of previous values.

16. The device for channel state information reporting according to claim 13, characterized in that The at least one processor is further configured to notify a network of the prediction model.

17. The device for channel state information reporting according to claim 13, characterized in that The at least one processor is further configured to: A second reference signal set is measured at a second time point prior to the first time point to determine a second set of values ​​corresponding to the CSI parameter set, wherein the plurality of sets of previous values ​​include the second set of values.

18. A computer-readable medium storing computer-executable code for channel state information reporting, the computer-executable code, when executed, causing a user equipment to perform: Measuring a first reference signal set at a first time point to determine a first set of values ​​corresponding to a channel state information (CSI) parameter set; determining a difference between the first set of values ​​and a reference set of values ​​corresponding to the CSI parameter set; sending a first CSI report including a change indicator indicating the difference; as well as The reference value set for the first time point is generated by a prediction model based on multiple groups of previous values ​​corresponding to the CSI parameter set corresponding to multiple time points before the first time point.

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