Wireless communication method, terminal device, and network device

Abstract

Provided are a wireless communication method, a terminal device, and a network device. The method comprises: a terminal device receives a first synchronization signal sent by a first network device, wherein the first synchronization signal is sent by means of a plurality of antenna ports. In the related art, before an RRC connection is established between a terminal device and a network device, only single-port transmission can be performed between the network device and the terminal device, and precoding technology cannot be used in single-port transmission. On the basis of the present application, the terminal device can measure the first synchronization signal sent by the plurality of antenna ports, and precoding-based technology can be used during uplink transmission, for example, precoding-based technology is used in an initial access process, thereby improving the reliability of uplink reception.

Description

Wireless communication methods, terminal devices, and network devices Technical Field

[0001] This application relates to the field of communication technology, and more specifically, to a wireless communication method, terminal device, and network device. Background Technology

[0002] The initial access process refers to the process by which a terminal device establishes an initial connection with a wireless network, and it is a crucial step in a communication system. During the initial access process, the terminal device scans and measures the synchronization signal / physical broadcast channel block (SSB) transmitted from the network device, evaluates the signal quality, and selects the optimal SSB for access. The terminal device uses a downlink receive space filter that receives this SSB as an uplink transmit space filter. The inventors of this application have discovered that, with the development of communication technology, this process needs optimization. Summary of the Invention

[0003] This application provides a wireless communication method, a terminal device, and a network device. The various aspects covered by this application are described below.

[0004] In a first aspect, a wireless communication method is provided, the method comprising: a terminal device receiving a first synchronization signal sent by a first network device; wherein the first synchronization signal is sent through a plurality of antenna ports (hereinafter referred to as ports).

[0005] In a second aspect, a wireless communication method is provided, the method comprising: a first network device sending a first synchronization signal to a terminal device; wherein the first synchronization signal is sent through multiple antenna ports.

[0006] Thirdly, a wireless communication method is provided, the method comprising: a second network device receiving first information sent by a terminal device; wherein the first information is used to indicate channel state information and / or precoding information corresponding to a first synchronization signal sent by a first network device through multiple antenna ports.

[0007] Fourthly, a terminal device is provided, comprising: a first receiving unit for receiving a first synchronization signal sent by a first network device; wherein the first synchronization signal is sent through multiple antenna ports.

[0008] Fifthly, a network device is provided, which is a first network device, comprising: a transmitting unit for transmitting a first synchronization signal to a terminal device; wherein the first synchronization signal is transmitted through multiple antenna ports.

[0009] In a sixth aspect, a network device is provided, which is a second network device, comprising: a second receiving unit for receiving first information sent by a terminal device; wherein the first information is used to indicate channel state information and / or precoding information corresponding to a first synchronization signal sent by a first network device through multiple antenna ports.

[0010] In a seventh aspect, a terminal device is provided, including a transceiver, a memory, and a processor, wherein the memory is used to store a program, the processor is used to invoke the program in the memory, and to control the transceiver to receive or send signals so that the terminal device performs some or all of the steps in the method of the first aspect.

[0011] Eighthly, a network device is provided, including a transceiver, a memory, and a processor, wherein the memory is used to store a program, the processor is used to invoke the program in the memory, and to control the transceiver to receive or transmit signals so that the network device performs some or all of the steps in the method of the second or third aspect.

[0012] Ninthly, a communication system is provided, which includes the aforementioned terminal device and / or network device. In another possible design, the system may further include other devices that interact with the terminal device or network device as described in the embodiments of this application.

[0013] In a tenth aspect, a computer-readable storage medium is provided, the computer-readable storage medium storing a computer program that causes a terminal device and / or a network device to perform some or all of the steps in the methods of the above aspects.

[0014] Eleventhly, embodiments of this application provide a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program operable to cause a terminal device and / or a network device to perform some or all of the steps of the methods described in the foregoing aspects. In some implementations, the computer program product may be a software installation package.

[0015] In a twelfth aspect, embodiments of this application provide a chip including a memory and a processor, the processor being able to call and run a computer program from the memory to implement some or all of the steps described in the methods of the foregoing aspects.

[0016] In related technologies, before establishing a radio resource control (RRC) connection, the terminal device and the network device can only transmit through a single port, and single-port transmission cannot utilize precoding technology. Based on this application, the terminal device can measure the first synchronization signal transmitted by multiple antenna ports and can use precoding-based technology during uplink transmission, such as using precoding-based technology during the initial access process, thereby improving the reliability of uplink reception. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the wireless communication system used in the embodiments of this application.

[0018] Figure 2 is an example diagram of a scenario for sending an SSB.

[0019] Figure 3A is an example diagram of how to use an antenna array with a frequency range (FR) of 1.

[0020] Figure 3B is an example diagram of how to use the antenna array of FR2.

[0021] Figure 3C is an example diagram illustrating the use of an antenna array in the centimeter wave band.

[0022] Figure 4 is a schematic flowchart of a wireless communication method provided in an embodiment of this application.

[0023] Figure 5 is an example diagram of a communication process provided in Embodiment 1.

[0024] Figure 6 is an example diagram of a communication process provided in Embodiment 2.

[0025] Figure 7 is a schematic structural diagram of a terminal device 700 provided in an embodiment of this application.

[0026] Figure 8 is a schematic structural diagram of a network device 800 provided in an embodiment of this application.

[0027] Figure 9 is a schematic structural diagram of a network device 900 provided in an embodiment of this application.

[0028] Figure 10 is a schematic structural diagram of a communication device provided in an embodiment of this application. Detailed Implementation

[0029] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0030] Communication system

[0031] Figure 1 illustrates a wireless communication system 100 according to an embodiment of this application. The wireless communication system 100 may include communication devices. These communication devices may include a network device 110 and a terminal device 120. The network device 110 may be a device that communicates with the terminal device 120.

[0032] Figure 1 illustrates an exemplary network device and two terminals. Optionally, the wireless communication system 100 may include multiple network devices, and each network device may include other terminal devices within its coverage area. This application embodiment does not limit this.

[0033] Optionally, the wireless communication system 100 may also include other network entities such as a network controller and a mobility management entity, which is not limited in this embodiment.

[0034] It should be understood that the technical solutions of the embodiments of this application can be applied to various communication systems, such as: 5th generation (5G) systems or new radio (NR), long term evolution (LTE) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD) systems, etc. The technical solutions provided in this application can also be applied to future communication systems, such as 6th generation mobile communication systems, satellite communication systems, and so on.

[0035] The terminal device in this application embodiment can also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station (MS), mobile terminal (MT), remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, or user device. The terminal device in this application embodiment can be a device that provides voice and / or data connectivity to a user, and can be used to connect people, objects, and machines, such as a handheld device with wireless connectivity, vehicle-mounted device, etc. The terminal device in the embodiments of this application can be a mobile phone, tablet computer, laptop computer, PDA, mobile internet device (MID), wearable device, virtual reality (VR) device, augmented reality (AR) device, wireless terminal in industrial control, wireless terminal in self-driving, wireless terminal in remote medical surgery, wireless terminal in smart grid, wireless terminal in transportation safety, wireless terminal in smart city, wireless terminal in smart home, etc. Optionally, the UE can be used to act as a base station. For example, the UE can act as a scheduling entity, providing sidelink signals between UEs in vehicle-to-everything (V2X) or device-to-device (D2D) communication. For example, cellular phones and cars communicate with each other using sidelink signals. Cellular phones and smart home devices communicate without relaying communication signals through a base station.

[0036] The network device in this application embodiment can be a device for communicating with terminal devices. The network device may also include an access network device. The access network device can provide communication coverage for a specific geographical area and can communicate with the terminal device 120 located within that coverage area. The access network device can also be called a wireless access network device or a base station, etc. In this application embodiment, the access network device can refer to a radio access network (RAN) node (or device) that connects the terminal device to the wireless network. Access network equipment can broadly encompass various names listed below, or be replaced by names such as: NodeB, Evolved NodeB (eNB), Next Generation NodeB (gNB), Relay Station, Transmitting and Receiving Point (TRP), Transmitting Point (TP), Master eNB (MeNB), Secondary eNB (SeNB), Multi-Standard Radio (MSR) Node, Home Base Station, Network Controller, Access Node, Wireless Node, Access Point (AP), Transmitter Node, Transceiver Node, Baseband Unit (BBU), Remote Radio Unit (RRU), Active Antenna Unit (AAU), Remote Radio Head (RRH), Central Unit (CU), Distributed Unit (DU), Location Node, Centralized Unit-Control Plane (CU-CP), Centralized Unit-User Plane (CU-User) Base stations can be macro base stations, micro base stations, relay nodes, donor nodes, or similar entities, or combinations thereof. A base station can also refer to a communication module, modem, or chip installed within the aforementioned equipment or apparatus. A base station can also be a mobile switching center, equipment performing base station functions in D2D, V2X, and machine-to-machine (M2M) communications, network-side equipment in 6G networks, and equipment performing base station functions in future communication systems. Base stations can support networks using the same or different access technologies. The embodiments of this application do not limit the specific technologies or equipment forms used in the access network equipment.

[0037] Base stations can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile base station, and one or more cells can move depending on the location of the mobile base station. In other examples, a helicopter or drone can be configured as a device to communicate with another base station.

[0038] Wireless communication systems involve communication equipment that can include not only access network equipment and terminal equipment, but also core network elements. Core network elements can be implemented through devices; that is, core network elements are core network devices. It can be understood that core network devices can also be a type of network device.

[0039] The core network elements in this application embodiment may include network elements that process and forward user signaling and data. For example, core network equipment may include core access and mobility management function (AMF), session management function (SMF), location management function (LMF), network slice selection function (NSSF), authentication server function (AUSF), unified data management (UDM), policy control function (PCF), user plane function (UPF), sensing function (SF), network data analytics function (NWDAF), and artificial intelligence (AI) function management entity, etc. Of course, the core network may also include other network elements, which are not listed here.

[0040] In some deployments, the network device in this application embodiment may refer to a CU or a DU, or the network device may include both a CU and a DU. The gNB may also include an AAU.

[0041] Network devices and terminal devices can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; and they can also be deployed in the air on airplanes, balloons, and satellites. This application does not limit the scenario in which the network devices and terminal devices are located.

[0042] It should be understood that all or part of the functions of the communication device in this application can also be implemented by software functions running on hardware, or by virtualization functions instantiated on a platform (e.g., a cloud platform).

[0043] Initial Access

[0044] The initial access process of an NR system will be used as an example below to illustrate the initial access procedure. It is understood that the initial access procedure described below can also be applied to other communication systems.

[0045] First, a measurement and system information acquisition phase is required. After the terminal device powers on, it searches for SSBs in the network. For the terminal device, measuring and selecting the optimal SSB serves to obtain downlink time synchronization, determine the uplink transmission beam direction, and decode the PBCH in the SSB. The PBCH contains the higher-layer master information block (MIB). This MIB contains the scheduling information of the PDSCH carrying system information block 1 (SIB1).

[0046] The terminal equipment scans and measures the SSBs transmitted from the base station (one TRP), evaluates the signal quality (such as L1-RSRP), and selects the optimal SSB for access. The terminal equipment uses the downlink receive spatial filter that receives the SSB as an uplink transmit spatial filter. To simplify the terminal equipment's measurements and cell and / or beam selection during the initial access phase, relevant technical specifications stipulate that the antenna port of the 4, 8, or 64 SSBs transmitted by the network equipment is only one antenna port. Based on this antenna port, the terminal equipment can calculate the link quality of the SSB, such as L1-RSRP and L1-RSSI. This is explained below with reference to Figure 2.

[0047] Figure 2 illustrates a scenario for transmitting SSBs. As shown in Figure 2, within a half-frame (5ms) range, the network device transmits eight SSBs with SSB indices #0 to #7 through eight beams to cover different directions. Figure 2 shows that these eight SSBs can form a set of synchronization broadcast blocks.

[0048] The terminal device can receive multiple SSBs with different signal strengths. The terminal device can select the beam corresponding to the SSB with the strongest signal strength as its own SSB beam.

[0049] As shown in Figure 2, UE1 and UE2 receive eight SSBs with different signal strengths. For the SSBs received by UE1, SSB#1 has the strongest signal strength. Therefore, the beam corresponding to SSB#1 can be used as the SSB beam for UE1. For the SSBs received by UE2, SSB#6 has the strongest signal strength. Therefore, the beam corresponding to SSB#6 can be used as the SSB beam for UE2.

[0050] Based on the configuration information in the MIB and the system message transmission method determined in the protocol, the terminal device can detect the scheduling PDCCH of system messages from control resource set #0 (CORESET#0) and search space #0, decode the PDSCH carrying SIB1 from the PDCCH, and thus obtain the configuration information of the physical random access channel (RACH) in SIB1.

[0051] After the measurement and acquisition of system information phase, the RACH phase can be carried out.

[0052] Some communication technologies support a four-step RACH process. Some communication systems support a two-step RACH process (divided into step A and step B). The following explanation uses a four-step RACH process as an example.

[0053] Step 1: The terminal device sends a random access preamble.

[0054] The random access preamble can also be called message 1 (Msg.1). The terminal device can select a random access preamble and send it to a base station (TRP) on the physical random access channel (PRACH).

[0055] Step 2: After receiving the preamble, the network device sends a random access response (RAR).

[0056] RAR can also be called Message 2 (Msg.2). RAR contains timing advance (TA), uplink resource allocation (i.e., uplink grant (UL grant)), and cell radio network temporary identity (C-RNTI).

[0057] Step 3: The terminal device uses the uplink resources allocated in the RAR to send an RRC connection request message (RRCSetupRequest).

[0058] The RRC connection request message can also be called message 3 (Msg.3). The RRC connection request message contains the terminal device identifier and the reason for connection establishment. This step is part of a contention-based random access procedure.

[0059] Step 4: The network device sends an RRC connection setup (RRCSetup) message.

[0060] The RRC connection setup message, also known as message 4 (Msg.4), is sent by a network device upon receiving an RRC connection request to confirm the request and allocate necessary resources. The RRC connection setup message marks the completion of the initial access process.

[0061] codebook

[0062] A codebook is a set of precoding matrices used to convert data bits into data mapped to each antenna port. Codebook design is crucial for achieving efficient and flexible wireless communication, helping network devices select appropriate precoding matrices to better serve users. For an explanation of codebooks, refer to the uplink codebook in the NR standard. The downlink codebook in the NR standard is too complex to be used directly during initial access. Table 1 shows an example codebook using a 4-antenna setup. In Table 1, a codebook consists of 28 codewords, or 28 precoding vectors.

[0063] Table 1

[0064] Antenna arrays in different frequency bands

[0065] Some communication providers (such as 6G systems) may use centimeter wave bands. Centimeter wave bands typically use the spectrum between 7 GHz and 24 GHz. This band is more suitable for using more antenna ports than FR1 (below 7 GHz) and FR2 (above 24 GHz). Each antenna port can be supported by a set of hardware transmit-receive units (TXRUs).

[0066] Figures 3A and 3B show examples of how to use the antenna arrays FR1 and FR2, respectively.

[0067] As shown in Figure 3A, for the low-frequency band of FR1, the number of antenna ports is moderate, generally using 2, 4, 8, or 16 antenna ports. Based on the channel state information (CSI) feedback from the terminal device (such as the precoding matrix indicator (PMI)), baseband precoding is used to utilize the antenna resources on the network side. As shown in Figure 3B, for the high-frequency band of FR2, the number of antenna ports is smaller, generally using 1 to 2 ports (2 ports are implemented using cross-polarized antenna panels, such as the black and gray antenna elements in the error message). Analog beamforming of the radio frequency is mainly used to utilize the antenna resources on the network side. It should be noted that for the same antenna panel, the final number of antenna ports depends on the mapping relationship between the antenna elements and the antenna ports.

[0068] For the centimeter-wave band (also known as FR3) between FR1 and FR2, a large number of antenna elements can be deployed, resulting in a large number of antenna ports (e.g., 64, 128, 256, 512, 1024, etc.). Network devices can perform simulated beamforming on each antenna port. This is illustrated below with reference to Figure 3C. As shown in Figure 3C, an extremely large aperture array (ELAA) can be divided into four different regions, each forming one or two antenna ports, with each port virtualized from multiple antenna elements. The advantage of this technology is that, in addition to simulated beamforming, network devices can also perform baseband precoding, which is a practical implementation of hybrid beamforming technology.

[0069] In response to the advancements in the aforementioned communication systems, this application provides the communication method shown in Figure 4.

[0070] The method shown in Figure 4 can be performed by a terminal device and a first network device. The method shown in Figure 4 may include step S410.

[0071] In step S410, the terminal device receives the first synchronization signal sent by the first network device.

[0072] The first synchronization signal can be used to achieve one or more of the following: downlink synchronization, cell search, cell synchronization, cell measurement, beam (i.e., space transmission filter) scanning, system information transmission, etc.

[0073] The first synchronization signal may include, for example, one or more of the following: some or all of the signals in the SSB, and CSI-RS. For example, the first synchronization signal may include one or more of PSS, SSS, and PBCH. Exemplarily, the first synchronization signal may include a specific combination of PSS, SSS, and PBCH.

[0074] As mentioned above, the inventors of this application have discovered that in related technologies, before establishing an RRC connection, the terminal device and the network device can only transmit via a single port, and single-port transmission cannot utilize precoding technology. This technical solution may lead to many problems. For example, since the network device cannot determine the channel quality indicator (CQI) of the terminal device, the modulation scheme and channel coding rate used for downlink transmission, i.e., the modulation and coding scheme (MCS), are fixed. Furthermore, when the terminal device decodes system messages, such as SIB1 system messages carried by the PDSCH scheduled by the PDCCH, the network device can only use a single port for transmission. After selecting the SSB, the PRACH transmitted by the terminal device can only be transmitted via a single port according to the selected SSB. This results in uplink transmission only being able to use beamforming and not baseband precoding technology, leading to low reliability of uplink reception.

[0075] This application proposes that a first synchronization signal be transmitted through multiple antenna ports. Exemplarily, this application can be applied to the millimeter-wave band. Taking the four antenna ports in Figure 3C as an example, the first synchronization signal can be transmitted through multiple antenna ports among the four antenna ports.

[0076] Based on this application, the terminal device can measure the first synchronization signal transmitted by multiple antenna ports and use precoding technology during transmission, thereby solving the above problems and improving the reliability of uplink reception.

[0077] In some embodiments, the first network device may use the same downlink spatial filter (i.e., downlink beam) to transmit the first synchronization signal for each antenna port. In other embodiments, the first network device may use different downlink spatial filters to transmit for different antenna ports.

[0078] It should be noted that the first synchronization signal transmitted through multiple antenna ports is for a single cell (e.g., a target cell). In other words, step S410 can be understood as a target cell transmitting the first synchronization signal on multiple antenna ports.

[0079] In some embodiments, the first network device may transmit one or more synchronization signals to achieve downlink synchronization channel coverage. Exemplarily, the one or more synchronization signals may be transmitted separately through one or more beams. The one or more synchronization signals may include a first synchronization signal. Some or all of the one or more synchronization signals may be transmitted through multiple antenna ports.

[0080] The terminal device can select one synchronization signal from one or more synchronization signals as the first synchronization signal. Taking the synchronization signal including SSB as an example, the first synchronization signal can be the optimal SSB selected by the terminal device.

[0081] This application does not limit the method by which the terminal device selects a synchronization signal. For example, the terminal device can select a synchronization signal based on its quality. Exemplarily, the terminal device can select the synchronization signal with the highest quality. That is, the first synchronization signal can be the synchronization signal with the highest quality. As another example, the terminal device can select a synchronization signal based on its CQI. Exemplarily, the terminal device can select the synchronization signal corresponding to the highest CQI. That is, the first synchronization signal can be the synchronization signal with the highest CQI.

[0082] The following uses the first synchronization signal as an example to illustrate how to obtain the quality of the synchronization signal. The terminal device can measure the first synchronization signal to obtain its quality. The terminal device can average the signal quality (e.g., linear averaging) over time-frequency domain resources to obtain the quality of the first synchronization signal. For multiple antenna ports, the terminal device can average the signal quality (e.g., linear averaging) across multiple antenna ports to obtain the quality of the first synchronization signal. The signal quality may include, for example, one or more of the following: layer 1 reference signal received power (L1-RSRP) and layer 1 received signal strength indicator (L1-RSSI).

[0083] In some embodiments, the terminal device may transmit first information. This first information may be related to a first synchronization signal transmitted through the plurality of antenna ports. For example, the first information may be used to indicate the first synchronization signal. That is, the first information may be used to indicate the synchronization signal selected by the terminal device. Alternatively, the first information may include a Channel Identity System (CSI). In other words, for a synchronization signal transmitted on the plurality of antenna ports, the terminal device can measure the wireless channel of the plurality of antenna ports over the air interface to obtain a suitable CSI, and feed back the suitable CSI to the network side through the first information, thereby enhancing the reliability of subsequent transmissions.

[0084] It is understandable that, considering the first information in this application can enable CSI reporting during the initial access phase, this CSI can also be referred to as early CSI.

[0085] In some embodiments, the first information may include precoding information. The precoding information may, for example, include a PMI (Precoding Information Management Interface). The precoding information may, for example, indicate a first precoding vector. The first precoding vector may be indicated by codewords in a first codebook. The first precoding vector may be selected by the terminal device from the first codebook. Exemplarily, the first precoding vector may be the optimal precoding vector.

[0086] In one implementation, the terminal device can select one synchronization signal from multiple synchronization signals as the first synchronization signal based on the quality of the synchronization signal. The terminal device can measure multiple antenna ports of the first synchronization signal to obtain the downlink channel matrix H, and select a precoding vector (e.g., the optimal precoding vector or a suitable precoding vector) from the first codebook. This selected precoding vector can then be used as the first precoding vector.

[0087] As another implementation, the terminal device can first select some or all of the multiple synchronization signals, and determine the first precoding vector based on the quality, channel matrix, and precoding matrix of the selected synchronization signals. For example, for multiple synchronization signals (each transmitted through multiple antenna ports), the terminal device does not immediately use simple indicators such as L1-RSRP or L1-RSSI to select a synchronization signal. Instead, it selects multiple or all synchronization signals and calculates which synchronization signal can obtain the highest channel quality indication (e.g., CQI) based on the measured channel matrix H and precoding matrix. The synchronization signal that obtains the highest CQI is then selected as the first synchronization signal, and the corresponding first precoding vector is reported. This implementation allows for a more comprehensive consideration when selecting the first precoding vector. For example, even if the L1-RSRP of a synchronization signal is high, but its CQI is low due to system interference, the precoding vector corresponding to that synchronization signal can still be selected as the optimal precoding vector for reporting.

[0088] In some embodiments, the precoding vectors corresponding to the codewords in the first codebook are all in a single column, i.e., rank 1 transmission, which is equivalent to Layer 1 spatial multiplexing transmission. This configuration of the first codebook is more consistent with the basic configuration information of the initial access phase.

[0089] In some embodiments, the first codebook may be predefined.

[0090] One implementation approach is to predefine a pre-coded codebook, which serves as the first codebook. The terminal device can determine the first codebook based on this pre-defined codebook. For example, the pre-defined pre-coded codebook may only apply to downlink synchronization signals on M ports. M can be a positive integer, such as M = 4. This technical solution is relatively simple to implement.

[0091] As an alternative implementation, multiple codebooks can be predefined. The first codebook can be selected from multiple predefined codebooks. This technique enriches the selection of pre-encoding codebooks. For example, multiple codebooks can be applied to different antenna port configurations. For instance, multiple codebooks can be used for different numbers of antenna ports. Multiple codebooks can include, for example, one or more of the following: a codebook for 2 ports, a codebook for 4 ports, a codebook for 8 ports, and a codebook for N ports. N can be a positive integer.

[0092] In some embodiments, the first network device may send codebook information. The codebook information can be used to indicate a first codebook selected by the first network device. That is, the first network device can use the codebook information to indicate which codebook it has selected from a predefined plurality of codebooks. The codebook information may be carried in a system message. For example, the codebook information may be carried in MIB and / or SIB messages.

[0093] In some embodiments, the first information may be used to indicate channel state information corresponding to a first synchronization signal transmitted through multiple antenna ports. The channel state information may be used to indicate channel quality. For example, the channel state information may be used to indicate optimal channel quality. Exemplarily, the channel state information may include CQI (Channel Quality Information).

[0094] As described above, the first synchronization signal can be selected by the terminal device from one or more synchronization signals. Therefore, the channel state information corresponding to the first synchronization signal can be calculated by the terminal device based on multiple antenna ports of the first synchronization signal. For example, the channel state information can be calculated based on the channel matrix H described above and the selected first precoding vector.

[0095] In some embodiments, the first information may include a first precoding vector and channel state information corresponding to a first synchronization signal transmitted through multiple antenna ports. That is, the terminal device reports not only the selected precoding vector but also the channel state information. The channel state information may correspond to the first precoding vector. For example, the first information may include the first precoding vector and the CQI corresponding to the first precoding vector.

[0096] In some embodiments, the first information may not include channel state information corresponding to the first synchronization signal transmitted through multiple antenna ports. That is, the terminal device may not report channel state information, for example, only reporting the first precoding vector. For example, if subsequent downlink transmissions use a fixed MCS level, such as QAM-4 modulation and a specific code rate, the terminal device does not need to report channel state information.

[0097] In some embodiments, the first information is carried in the PRACH. That is, the first information can be carried in Msg.1. For example, the first information can be carried as a random preamble on the PRACH. Exemplarily, the first information is carried through a sequence of PRACH (i.e., a preamble sequence). Alternatively, the first information can be carried through the payload of the PRACH.

[0098] In some embodiments, if the PRACH channel consists of a sequence (i.e., no information field), the first information can be carried by the sequence of the PRACH.

[0099] As one implementation, when precoding information is represented by PMI and / or channel quality indication information is represented by CQI, PMI and / or CQI can be associated with a PRACH sequence. This association can be predefined by the protocol. That is, a specific sequence can characterize a corresponding PMI or CQI, or a combination of a pair of PMIs and CQIs. The correspondence can be predefined by the protocol. For example, preamble sequence ID#1 corresponds to PMI#A. Another example is preamble sequence ID#2 corresponding to CQI#i. Yet another example is preamble sequence ID#3 corresponding to both PMI#A and CQI#i.

[0100] The payload of a PRACH can be indicated, for example, through its information field. For instance, a PRACH channel may consist not only of a sequence but also an information field carrying first information. Alternatively, a PRACH may consist of two parts: the first part consists only of a sequence, while the second part contains a specific information field that can be used to carry the first information. There is a correlation between the first and second parts of the PRACH. In these cases, the first information can be carried through the information field of the PRACH.

[0101] In some embodiments, the first information is carried in the RRC connection request message. In other words, the first information can be carried in Msg.3. For example, if the terminal device measures the first synchronization signal and decodes the basic configuration information (such as SIB1), the terminal device may not report the first information in the PRACH (i.e., Msg.1), but may include the first information in Msg.3 after receiving the RAR. Therefore, in this application, Msg.3 can be used to request other system messages and also to report the first information. In this case, the network device can send the request system message sent by the terminal device to the terminal device in the initial stage of single-port (i.e., without precoding) and fixed MCS mode.

[0102] In some embodiments, the first information is carried in the RAR-scheduled PUSCH and / or PUCCH. Exemplarily, the first information is carried via UCI or MAC CE. For example, in PUCCH and / or PUSCH, the first information can be carried via UCI. Similarly, in PUSCH, the first information can be carried via MAC CE.

[0103] In some embodiments, the terminal device may send first information to the first network device. The cell corresponding to the first network device may be referred to as the target cell. That is, the terminal device may send the channel state information and / or precoding information corresponding to the synchronization signal of the target cell to the target cell.

[0104] As one implementation, the first information can be carried in the first message. The first message can be a message in the random access procedure for the cell (i.e., the target cell) corresponding to the first network device, or the first message can be a message related to the random access procedure. For example, the first message can be one or more of the following information of the target cell: PRACH, Msg.3, RAR-scheduled PUSCH and / or PUCCH, etc. For specific embodiments on how the first information is carried in the first message, please refer to the above text, which will not be repeated here.

[0105] In some embodiments, the terminal device may send first information to the second network device. That is, the terminal device may send the channel state information and / or precoding information corresponding to the synchronization signal of the target cell to a non-target cell. As shown in FIG4, the method shown in FIG4 may also be executed by the second network device. The method shown in FIG4 may further include step S450. In step S450, the terminal device may send the first information to the second network device.

[0106] For example, the cell corresponding to the second network device can be a cell that the terminal device has already accessed (e.g., the primary cell). The target cell corresponding to the first network device can be a cell that the terminal device has not accessed. Since it has already accessed the primary cell, the terminal device may have obtained the basic configuration information for accessing the target cell. In this scenario, the terminal device can measure the synchronization signal sent by the target cell and send the first information of the target cell to the primary cell that is not the target cell.

[0107] In some embodiments, when sending first information to a second network device, the first information may be carried in a second message. This application does not limit the type of the second message.

[0108] In one implementation, the second message may include: the identifier of the cell corresponding to the first network device, i.e., the target cell identifier. The target cell identifier can be used to inform the second network device of the cell corresponding to the channel state information and / or precoding information. For example, the second message may include the following information: the cell index of the target cell, the precoding information of the target cell, and the channel quality indication information of the target cell.

[0109] In some embodiments, the second network device may send first information to the first network device, thereby enabling the first network device to obtain the first information.

[0110] In some embodiments, the first network device may select the precoding and / or MCS for downlink transmissions with the terminal device (e.g., downlink transmissions in the initial process) based on the received first information.

[0111] As can be seen from the above embodiments, the first information received by the first network device can be obtained directly from the terminal device or obtained from the second network device.

[0112] It should be noted that the first network device and the second network device can be the same network device. That is, the target cell and the primary cell can correspond to the same network device.

[0113] It should be noted that the technical solution of receiving channel state information and / or precoding information of target cell through primary cell can be applied in the following scenarios: multi-cell scenarios based on cells, intra-cell operation scenarios based on TRP, and multi-cell mobility scenarios (such as cell handover scenarios).

[0114] For ease of understanding, the following description is provided through Examples 1 and 2.

[0115] Example 1

[0116] Figure 5 is an example diagram of a communication process provided in Embodiment 1.

[0117] In Figure 5, cell 2 is the target cell. The network device corresponding to cell 2 is the first network device. The method shown in Figure 5 includes steps S510 and S520.

[0118] In step S510, cell 2 sends one or more downlink synchronization signals to the terminal device. These downlink synchronization signals are transmitted through multiple antenna ports. The one or more downlink synchronization signals include a first synchronization signal.

[0119] The terminal device determines the CSI based on one or more downlink synchronization signals received.

[0120] In step S520, the terminal device initiates a random access procedure for cell 2 (represented by RACH in the figure) and transmits CSI during the random access procedure. CSI is transmitted via Msg.1, PUSCH, or PUCCH.

[0121] In Figure 5, cell 1 can also be the target cell. In this case, the network device corresponding to cell 1 can be the first network device. The method shown in Figure 5 may include steps S550 and S560.

[0122] In step S550, cell 1 sends one or more downlink synchronization signals to the terminal device. These downlink synchronization signals are transmitted through multiple antenna ports. The one or more downlink synchronization signals include a first synchronization signal.

[0123] The terminal device determines the CSI based on one or more downlink synchronization signals received.

[0124] In step S560, the terminal device initiates a random access procedure for cell 1 (represented by RACH in the figure). The terminal device may transmit CSI during the random access procedure (not shown in Figure 5). CSI is transmitted via Msg.1, PUSCH, or PUCCH.

[0125] Example 2

[0126] Figure 6 is an example diagram of a communication process provided in Embodiment 2.

[0127] In Figure 6, cell 2 is the target cell, and the network device corresponding to cell 2 is the first network device. Cell 1 is the primary cell, and the network device corresponding to cell 1 is the second network device. The method shown in Figure 6 includes steps S610 to S630.

[0128] In step S610, cell 2 sends one or more downlink synchronization signals to the terminal device. These downlink synchronization signals are transmitted through multiple antenna ports. The one or more downlink synchronization signals include a first synchronization signal.

[0129] In step S620, the terminal device sends a CSI report to cell 1. The CSI report is determined based on one or more downlink synchronization signals received by the terminal device from cell 2.

[0130] In step S630, CSI of terminal devices is exchanged between cell 1 and cell 2. For example, cell 1 forwards the CSI report received in step S620 to cell 2.

[0131] Cell 1 can be a cell that the terminal device has already accessed before step S620. Figure 6 may also include steps S601 and S603, for example.

[0132] Step S601: Cell 1 sends a downlink synchronization signal. Step S603: The terminal device performs a random access procedure for Cell 1 based on the received downlink synchronization signal sent by Cell 1.

[0133] The method embodiments of this application have been described in detail above. The apparatus embodiments of this application are described in detail below. It should be understood that the descriptions of the method embodiments correspond to the descriptions of the apparatus embodiments. Therefore, any parts not described in detail can be referred to the foregoing method embodiments.

[0134] Figure 7 is a schematic structural diagram of a terminal device 700 provided in an embodiment of this application. The terminal device 700 includes a first receiving unit 710.

[0135] The first receiving unit 710 is used to receive a first synchronization signal sent by the first network device; wherein the first synchronization signal is sent through multiple antenna ports.

[0136] In some embodiments, the terminal device 700 is further configured to: transmit first information; wherein the first information is configured to indicate channel state information and / or precoding information corresponding to the first synchronization signal transmitted through the plurality of antenna ports.

[0137] In some embodiments, the first information is carried on the Physical Random Access Channel (PRACH).

[0138] In some embodiments, the first information is carried by a PRACH sequence.

[0139] In some embodiments, the first information is carried by the payload of the PRACH.

[0140] In some embodiments, the first information is carried in a Radio Resource Control (RRC) connection request message.

[0141] In some embodiments, the first information is carried in the Physical Uplink Shared Channel (PUSCH) or Physical Uplink Control Channel (PUCCH) scheduled by the Random Access Response (RAR).

[0142] In some embodiments, the first information is carried via uplink control information (UCI) or media access control layer control unit (MAC CE).

[0143] In some embodiments, the precoding information is used to indicate a first precoding vector, which is indicated by codewords in a first codebook, and the precoding vectors corresponding to the codewords in the first codebook are all in a column.

[0144] In some embodiments, the first codebook is selected from a plurality of predefined codebooks.

[0145] In some embodiments, the terminal device 700 is further configured to: receive codebook information sent by the first network device; wherein the codebook information is used to indicate the first codebook selected by the first network device.

[0146] In some embodiments, sending the first information includes: sending the first information to the first network device; wherein the first information is carried in a first message, and the first message is a message in the random access process of the cell corresponding to the first network device.

[0147] In some embodiments, sending the first information includes: sending the first information to a second network device; wherein the cell corresponding to the second network device is a cell that the terminal device has already accessed, and the cell corresponding to the first network device is a cell that the terminal device has not accessed.

[0148] In some embodiments, the first synchronization signal includes an SSB.

[0149] In an optional embodiment, the first receiving unit 710 may be a transceiver 1030. The terminal device 700 may also include a processor 1010 and a memory 1020, as shown in FIG10.

[0150] Figure 8 is a schematic structural diagram of a network device 800 provided in an embodiment of this application. The network device 800 is a first network device. The network device 800 includes a transmitting unit 810.

[0151] The transmitting unit 810 is used to transmit a first synchronization signal to the terminal device; wherein the first synchronization signal is transmitted through multiple antenna ports.

[0152] In some embodiments, the network device 800 is further configured to: receive first information; wherein the first information is configured to indicate channel state information and / or precoding information corresponding to the first synchronization signal transmitted through the plurality of antenna ports.

[0153] In some embodiments, the first information is carried on the Physical Random Access Channel (PRACH).

[0154] In some embodiments, the first information is carried by a PRACH sequence.

[0155] In some embodiments, the first information is carried by the payload of the PRACH.

[0156] In some embodiments, the first information is carried in a Radio Resource Control (RRC) connection request message.

[0157] In some embodiments, the first information is carried in the Physical Uplink Shared Channel (PUSCH) or Physical Uplink Control Channel (PUCCH) scheduled by the Random Access Response (RAR).

[0158] In some embodiments, the first information is carried via uplink control information (UCI) or media access control layer control unit (MAC CE).

[0159] In some embodiments, the precoding information is used to indicate a first precoding vector, which is indicated by codewords in a first codebook, and the precoding vectors corresponding to the codewords in the first codebook are all in a column.

[0160] In some embodiments, the first codebook is selected from a plurality of predefined codebooks.

[0161] In some embodiments, the network device 800 is further configured to: send codebook information to the terminal device; wherein the codebook information is used to indicate the first codebook selected by the first network device.

[0162] In some embodiments, receiving the first information includes: receiving the first information sent by the terminal device; wherein the first information is carried in a first message, and the first message is a message in the random access process of the cell corresponding to the first network device.

[0163] In some embodiments, receiving the first information includes: receiving the first information sent by the second network device; wherein the cell corresponding to the second network device is a cell that the terminal device has already accessed, and the cell corresponding to the first network device is a cell that the terminal device has not accessed.

[0164] In some embodiments, the first synchronization signal includes an SSB.

[0165] In an optional embodiment, the transmitting unit 810 may be a transceiver 1030. The network device 800 may also include a processor 1010 and a memory 1020, as shown in FIG10.

[0166] Figure 9 is a schematic structural diagram of a network device 900 provided in an embodiment of this application. The network device 900 is a second network device. The network device 900 includes a second receiving unit 910.

[0167] The second receiving unit 910 is used to receive first information sent by the terminal device; wherein the first information is used to indicate the channel state information and / or precoding information corresponding to the first synchronization signal sent by the first network device through multiple antenna ports.

[0168] In some embodiments, the network device 900 is further configured to: send the first information to the first network device.

[0169] In some embodiments, the cell corresponding to the second network device is a cell that the terminal device has already accessed, and the cell corresponding to the first network device is a cell that the terminal device has not accessed.

[0170] In some embodiments, the first synchronization signal includes an SSB.

[0171] In some embodiments, the precoding information is used to indicate a first precoding vector, which is indicated by codewords in a first codebook, and the precoding vectors corresponding to the codewords in the first codebook are all in a column.

[0172] In an optional embodiment, the second receiving unit 910 may be a transceiver 1030. The network device 900 may also include a processor 1010 and a memory 1020, as shown in FIG10.

[0173] Figure 10 is a schematic structural diagram of a communication apparatus according to an embodiment of this application. The dashed lines in Figure 10 indicate that the unit or module is optional. This apparatus 1000 can be used to implement the methods described in the above method embodiments. The apparatus 1000 can be a chip, a terminal device, or a network device.

[0174] Apparatus 1000 may include one or more processors 1010. The processor 1010 may support apparatus 1000 in implementing the methods described in the preceding method embodiments. The processor 1010 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0175] The apparatus 1000 may further include one or more memories 1020. The memories 1020 store a program that can be executed by the processor 1010, causing the processor 1010 to perform the methods described in the preceding method embodiments. The memories 1020 may be independent of the processor 1010 or integrated within the processor 1010.

[0176] The device 1000 may also include a transceiver 1030. The processor 1010 can communicate with other devices or chips via the transceiver 1030. For example, the processor 1010 can send and receive data with other devices or chips via the transceiver 1030.

[0177] This application also provides a computer-readable storage medium for storing a program. This computer-readable storage medium can be applied to a terminal or network device provided in this application, and the program causes a computer to execute the methods performed by the terminal or network device in various embodiments of this application.

[0178] This application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to a terminal or network device provided in this application embodiment, and the program causes a computer to execute the methods performed by the terminal or network device in various embodiments of this application.

[0179] This application also provides a computer program. This computer program can be applied to the terminal or network device provided in this application, and the computer program causes the computer to execute the methods performed by the terminal or network device in various embodiments of this application.

[0180] It should be understood that the terms "system" and "network" in this application can be used interchangeably. Furthermore, the terminology used in this application is only for explaining specific embodiments of the application and is not intended to limit the application. The terms "first," "second," "third," and "fourth," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. In addition, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0181] In the embodiments of this application, the term "instruction" can be a direct instruction, an indirect instruction, or an indication of a relationship. For example, A instructing B can mean that A directly instructs B, such as B being able to obtain information through A; it can also mean that A indirectly instructs B, such as A instructing C, so B can obtain information through C; or it can mean that there is a relationship between A and B.

[0182] In the embodiments of this application, "B corresponding to A" means that B is associated with A, and B can be determined based on A. However, it should also be understood that determining B based on A does not mean that B is determined solely based on A; B can also be determined based on A and / or other information.

[0183] In the embodiments of this application, the term "correspondence" can indicate a direct or indirect correspondence between two things, or an association between two things, or a relationship such as instruction and being instructed, configuration and being configured.

[0184] In this application embodiment, "predefined" or "preconfigured" can be implemented by pre-storing corresponding codes, tables, or other means that can be used to indicate relevant information in the device (e.g., including terminal devices and network devices). This application does not limit the specific implementation method. For example, predefined can refer to what is defined in the protocol.

[0185] In this application embodiment, the "protocol" may refer to a standard protocol in the field of communication, such as the LTE protocol, the NR protocol, and related protocols applied to future communication systems. This application does not limit this.

[0186] In the embodiments of this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0187] In the embodiments of this application, "comprising" can refer to direct inclusion or indirect inclusion. Optionally, "comprising" mentioned in the embodiments of this application can be replaced with "indicating" or "used to determine". For example, "A includes B" can be replaced with "A indicates B" or "A is used to determine B".

[0188] In the various embodiments of this application, the order of the above-mentioned processes does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0189] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0190] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0191] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0192] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can read or a data storage device such as a server or data center that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., digital video discs, DVDs) or semiconductor media (e.g., solid-state disks, SSDs), etc.

[0193] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method of wireless communication, the method comprising: Comprising: The terminal device receives a first network device sending a first synchronization signal; Wherein, the first synchronization signal is sent through multiple antenna ports.

2. The method of claim 1, wherein, Also comprising: The terminal device sends first information; Wherein, the first information is used to indicate the channel state information and / or precoding information corresponding to the first synchronization signal sent through the multiple antenna ports.

3. The method of claim 2, wherein, The first information is carried in the physical random access channel (PRACH).

4. The method of claim 3, wherein, The first information is carried through the sequence of PRACH.

5. The method according to claim 3 or 4, characterized in that, The first information is carried through the load of PRACH.

6. The method according to any one of claims 2-5, characterized in that, The first information is carried in the radio resource control (RRC) connection request message.

7. The method according to any one of claims 2-6, characterized in that, The first information is carried in the physical uplink shared channel (PUSCH) or physical uplink control channel (PUCCH) scheduled by the random access response (RAR).

8. The method of claim 7, wherein, The first information is carried through the uplink control information (UCI) or the medium access control (MAC) control element (CE).

9. The method according to any one of claims 2-8, characterized in that, The precoding information is used to indicate a first precoding vector, and the first precoding vector is indicated by a code word in a first codebook, and the precoding vectors corresponding to the code words in the first codebook are all columns.

10. The method of claim 9, wherein, The first codebook is selected from multiple predefined codebooks.

11. The method of claim 10, wherein, Also comprising The terminal device receives the codebook information sent by the first network device; Wherein, the codebook information is used to indicate the first codebook selected by the first network device.

12. The method according to any one of claims 2-11, characterized in that, The terminal device sending first information includes: the terminal device sending the first information to the first network device; Wherein, the first information is carried in the first message, and the first message is a message in the random access process of the cell corresponding to the first network device.

13. The method according to any one of claims 2-11, characterized in that, The terminal device sends first information includes: The terminal device sends the first information to the second network device; Wherein, the cell corresponding to the second network device is a cell that the terminal device has accessed, and the cell corresponding to the first network device is a cell that the terminal device has not accessed.

14. The method of claim 1, wherein, The first synchronization signal includes a synchronization signal / physical broadcast channel block (SSB).

15. A method of wireless communication, the method comprising: Comprising: The first network device sends a first synchronization signal to a terminal device; Wherein, the first synchronization signal is sent through multiple antenna ports.

16. The method of claim 15, wherein, Also comprising: The first network device receives first information; Wherein, the first information is used to indicate the channel state information and / or precoding information corresponding to the first synchronization signal sent through the multiple antenna ports.

17. The method of claim 16, wherein, The first information is carried in the physical random access channel (PRACH).

18. The method of claim 17, wherein, The first information is carried through the sequence of PRACH.

19. The method of claim 17 or 18, wherein, The first message is carried through the load of PRACH.

20. The method of any one of claims 16-19, wherein, The first information is carried in the radio resource control connection request message.

21. The method of any one of claims 16-20, wherein, The first information is carried in the physical uplink shared channel (PUSCF) or physical uplink control channel (PUCCH) scheduled by the random access response (RAT).

22. The method of claim 21, wherein, The first information is carried through the uplink control information (UCI) or the medium control layer (MAC) control element (CE).

23. The method of any one of claims 16-22, wherein, The precoding information is used to indicate a first precoder vector, and the first precoder vector is indicated by a code word in a first codebook, and the precoding vectors corresponding the code words in the first codebook are all columns.

24. The method of claim 23, wherein, The first codebook is selected from a plurality of predefined codebooks.

25. The method of claim 24, wherein, Further comprising The first network device sends codebook information to the terminal device. The codebook information is used to indicate the first codebook selected by the first network device.

26. The method of any one of claims 16-25, wherein, The first network device receives first information includes that the first network device receives the first information sent by the terminal device. The first information is carried in a first message, and the first message is a message in a random access process of a cell corresponding to the first network device.

27. The method of claim 16, wherein, The first network device receives first information includes that the first network device receives first information sent by the second network device. The cell corresponding to the second network device is a cell that the terminal device has accessed, and the cell corresponding to the first network device is a cell that the terminal device has not accessed.

28. The method of any one of claims 15-27, wherein, The first synchronization signal includes a synchronization signal / physical broadcast channel block (SSB).

29. A method of wireless communication, the method comprising: Comprising: The second network device receives first information sent by the terminal device. The first information is used to indicate channel state information and / or precoding information corresponding to the first synchronization signal sent by the first network device through a plurality of antenna ports.

30. The method of claim 29, wherein, Further comprising: The second network device sends the first information to the first network device.

31. The method of claim 29 or 30, wherein, The cell corresponding to the second network device is a cell that the terminal device has already accessed, and the cell corresponding to the first network device is a cell that the terminal device has accessed.

32. The method of any one of claims 29-31, wherein, The first synchronization signal includes a synchronization signal / physical broadcast channel block (SSB).

33. The method of any one of claims 29-32, wherein, The precoding information is used to indicate a first precoding vector, and the first precoding vector is indicated by a code word in a first codebook.

34. A terminal device, comprising: Comprising: A first receiving unit is configured to receive a first synchronization signal sent by a first network device. The first synchronization signal is sent through a plurality of antenna ports.

35. The terminal device of claim 34, wherein, The terminal device is further configured to: Send first information. The first information is used to indicate channel state information and / or precoding information corresponding to the plurality of antenna ports.

36. The terminal device of claim 35, wherein, The first information is carried in a physical random access channel (PRACH).

37. The terminal device of claim 36, wherein, The first information is carried by a sequence of the PRACH.

38. The terminal device of claim 36 or 37, wherein, The first information is carried by a load of the PRACH.

39. The terminal device of any one of claims 35-38, wherein, The first information is carried in a radio resource control (RRC) connection request message.

40. The terminal device of any one of claims 35-39, wherein, The first information is carried in a physical uplink shared channel (PUSCH) or a physical uplink control channel (PUCCH) scheduled by a random access response (RAR).

41. The terminal device of claim 40, wherein, The first information is carried by uplink control information (UCI) or a medium access control (MAC) control element (CE).

42. The terminal device of any one of claims 35-41, wherein, The precoding information is used to indicate a first precoding vector, and the first precording vector is indicated by a code word in a first codebook.

43. The terminal device of claim 42, wherein, The first codebook is selected from a plurality of predefined codebooks.

44. The terminal device of claim 43, wherein, The terminal device is further configured to: Receive codebook information sent by the first network device. The codebook information is used to indicate the first codebook selected by the first network.

45. The terminal device of any one of claims 35-44, wherein, The sending the first information comprises: sending the first information to the first network device. The first information is carried in a first message, and the first message is a message in a random access process of a cell corresponding to the first network device.

46. The terminal device of any one of claims 35-44, wherein, The sending the first information comprises: sending the first information to a second network device. The cell corresponding to the second network device is a cell that the terminal device has accessed, and the cell corresponding to the first network device is a cell that the terminal device has not accessed.

47. The terminal device of any one of claims 34-46, wherein, The first synchronization signal comprises a synchronization signal / physical broadcast channel block (SSB).

48. A network device, comprising: The network device is a first network device, and the network device comprises: a sending unit, configured to send a first synchronization signal to a terminal device; The first synchronization signal is sent through a plurality of antenna ports.

49. The network device of claim 48, wherein, The network device is further configured to: receive first information; The first information is used to indicate channel state information and / or precoding information corresponding to the first synchronization signal sent through the plurality of antenna ports.

50. The network device of claim 49, wherein, The first information is carried in a physical random access channel (PRACH).

51. The network device of claim 50, wherein, The first information is carried through a sequence of the PRACH.

52. The network device of claim 50 or 51, wherein, The first information is carried through a payload of the PRACH.

53. The network device of any of claims 49-52, wherein, The first information is carried in a radio resource control (RRC) connection request message.

54. The network device of any of claims 49-53, wherein, The first information is carried in a physical uplink shared channel (PUSCH) or a physical uplink control channel (PUCCH) scheduled by a random access response (RAR).

55. The network device of claim 54, wherein, The first information is carried through uplink control information (UCI) or a medium access control (MAC) control element (CE).

56. The network device of any of claims 49-55, wherein, The precoding information is used to indicate a first precoding vector, and the first precoding vector is indicated by a code word in a first codebook, and the code word in the first codebook corresponds to a precoding vector that is a column.

57. The network device of claim 56, wherein, The first codebook is selected from a plurality of predefined codebooks.

58. The network device of claim 57, wherein, The network device is further configured to: send codebook information to the terminal device; The codebook information is used to indicate the first codebook selected by the first network device.

59. The network device of any of claims 49-58, wherein, The receiving the first information comprises: receiving first information sent by the terminal device. The first information is carried in a first message, and the first message is a message during a random access process of a cell corresponding to the first network device.

60. The network device of claim 49, wherein, The receiving the first information comprises: receiving first information sent by a second network device. The cell corresponding to the second network device is a cell that the terminal has accessed, and the cell corresponding to the first network device is a cell that the terminal has not accessed.

61. The network device of any of claims 48-60, wherein, The first synchronization signal comprises a synchronization signal / physical broadcast channel block (SSBs).

62. A network device, comprising: The network device is a second network device, and the network device comprises: a second receiving unit, configured to receive first information sent by a terminal device; The first information is used to indicate channel state information and / or precoding information corresponding to a first synchronization signal sent by a first network device through a plurality of antenna ports.

63. The network device of claim 62, wherein, The network device is further configured to: send the first information to the first network device.

64. The network device of claim 62 or 63, wherein, The cell corresponding to the second network device is a cell that the terminal device has accessed, and the cell corresponding to the first network device is a cell that the terminal device has not accessed.

65. The network device of any of claims 62-64, wherein, The first synchronization signal includes a synchronization signal / physical broadcast channel block (SSB).

66. The network device of any of claims 62-65, wherein, The precoding information is used to indicate a first precoding vector, the first precoding vector is indicated by a code word in a first codebook, and the precoding vectors corresponding to the code words in the first codebook are all columns.

67. A terminal device, comprising: The apparatus includes a transceiver, a memory, and a processor, the memory is configured to store a program, the processor is configured to invoke the program in the memory, and control the transceiver to receive or send a signal, so that the terminal device executes the method in any one of claims 1-14.

68. A network device, comprising: The apparatus includes a transceiver, a memory, and a processor, the memory is configured to store a program, the processor is configured to invoke the program in the memory, and control the transceiver to receive or send a signal, so that the network device executes the method in any one of claims 15-33.

69. An apparatus, comprising: The apparatus includes a processor configured to invoke a program from a memory, so that the apparatus executes the method in any one of claims 1-33.

70. A chip, comprising: The apparatus includes a processor configured to invoke a program from a memory, so that the apparatus executes the method in any one of claims 1-33.

71. A computer readable storage medium, characterized in that, The apparatus includes a processor configured to invoke a program from a memory, so that the apparatus executes the method in any one of claims 1-33.

72. A computer program product, characterized in that, The apparatus includes a processor configured to invoke a program from a memory, so that the apparatus executes the method in any one of claims 1-33.

73. A computer program, characterized in that, The apparatus includes a processor configured to invoke a program from a memory, so that the apparatus executes the method in any one of claims 1-33.

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