Wireless communication method, terminal device and network device

Abstract

The invention provides a wireless communication method, terminal equipment and network equipment. The method comprises the following steps: under the condition that the terminal equipment and a first TRP keep uplink synchronization, the terminal equipment determines uplink synchronization information of a second TRP; wherein the uplink synchronization information of the second TRP is determined based on one or more of the following information: the uplink synchronization information of the first TRP; the downlink time difference of arrival is used for indicating a difference value between the time when the signal of the first TRP arrives at the terminal equipment and the time when the signal of the second TRP arrives at the terminal equipment; and a transmission time difference between the first TRP and the second TRP. Under the condition that the terminal equipment and the first TRP keep uplink synchronization, when the terminal equipment determines the uplink synchronization information of the second TRP, the terminal equipment can take the first TRP as a reference and considers one or more types of information related to the first TRP, so that the terminal equipment can acquire the uplink synchronization information of the second TRP without initiating a random access process to the second TRP, and the uplink synchronization information of the second TRP can be acquired by the terminal equipment without initiating a random access process to the second TRP. The uplink resource overhead is reduced, and the transmission delay is reduced.

Description

Method, terminal device and network device for wireless communication Technical Field

[0001] The present application relates to the field of communication technology, and more specifically, to a method, terminal device, and network device for wireless communication. Background Art

[0002] In some communication systems, the uplink synchronization information (e.g., timing advance (TA)) between a terminal device and a transmitting and receiving point (TRP) can be determined with the TRP as the granularity. In this case, the terminal device can access the TRP by initiating a random access procedure to obtain the uplink synchronization information of the TRP. The way in which the terminal device obtains the uplink synchronization information of the TRP through the random access procedure is not flexible enough and may result in high uplink resource overhead and extended transmission time.

[0003] Summary of the Invention

[0004] The present application provides a method, terminal device, and network device for wireless communication. The following introduces various aspects of the present application.

[0005] In a first aspect, a method for wireless communication is provided, comprising: when a terminal device maintains uplink synchronization with a first transmission receiving point TRP, the terminal device determines the uplink synchronization information of a second TRP; wherein the uplink synchronization information of the second TRP is determined based on one or more of the following information: the uplink synchronization information of the first TRP; a downlink arrival time difference, the downlink arrival time difference being used to indicate the difference between the time when the signal of the first TRP arrives at the terminal device and the time when the signal of the second TRP arrives at the terminal device; and the transmission time difference between the first TRP and the second TRP.

[0006] According to a second aspect, a method for wireless communication is provided, comprising: when a terminal device maintains uplink synchronization with a first transmission receiving point TRP, the terminal device receives first information, and the first information is used to activate a second TRP located in a different cell from the first TRP; in response to the first information, the terminal device sends an uplink reference signal to the second TRP, and the uplink reference signal is used by a network device to determine the uplink synchronization information of the second TRP.

[0007] According to a third aspect, a method for wireless communication is provided, comprising: when a terminal device maintains uplink synchronization with a first transmission receiving point TRP, a network device determines the uplink synchronization information of a second TRP; wherein the uplink synchronization information of the second TRP is determined based on one or more of the following information: the uplink synchronization information of the first TRP; a downlink arrival time difference, the downlink arrival time difference being used to indicate the difference between the time when the signal of the first TRP arrives at the terminal device and the time when the signal of the second TRP arrives at the terminal device; and the transmission time difference between the first TRP and the second TRP.

[0008] In a fourth aspect, a method for wireless communication is provided, comprising: when a terminal device maintains uplink synchronization with a first transmission receiving point TRP, a network device sends first information to the terminal device, wherein the first information is used to activate a second TRP located in a different cell from the first TRP; the network device determines the uplink synchronization information of the second TRP, and the uplink synchronization information is determined based on an uplink reference signal sent by the terminal device to the second TRP.

[0009] In the fifth aspect, a terminal device is provided, including: a determination module for determining the uplink synchronization information of a second TRP when the terminal device maintains uplink synchronization with a first transmission receiving point TRP; wherein the uplink synchronization information of the second TRP is determined based on one or more of the following information: the uplink synchronization information of the first TRP; the downlink arrival time difference, the downlink arrival time difference is used to indicate the difference between the time when the signal of the first TRP arrives at the terminal device and the time when the signal of the second TRP arrives at the terminal device; and the transmission time difference between the first TRP and the second TRP.

[0010] In the sixth aspect, a terminal device is provided, including: a receiving module for receiving first information when the terminal device maintains uplink synchronization with a first transmission receiving point TRP, wherein the first information is used to activate a second TRP located in a different cell from the first TRP; a sending module for sending an uplink reference signal to the second TRP in response to the first information, wherein the uplink reference signal is used by a network device to determine the uplink synchronization information of the second TRP.

[0011] In the seventh aspect, a network device is provided, including: a determination module for determining the uplink synchronization information of a second TRP when the terminal device maintains uplink synchronization with the first transmission receiving point TRP; wherein the uplink synchronization information of the second TRP is determined based on one or more of the following information: the uplink synchronization information of the first TRP; the downlink arrival time difference, the downlink arrival time difference is used to indicate the difference between the time when the signal of the first TRP arrives at the terminal device and the time when the signal of the second TRP arrives at the terminal device; and the transmission time difference between the first TRP and the second TRP.

[0012] In the eighth aspect, a network device is provided, including: a sending module for sending first information to a terminal device when the terminal device maintains uplink synchronization with a first transmission receiving point TRP, the first information being used to activate a second TRP located in a different cell from the first TRP; a determination module for determining the uplink synchronization information of the second TRP, the uplink synchronization information being determined based on an uplink reference signal sent by the terminal device to the second TRP.

[0013] In the ninth aspect, a terminal device is provided, comprising a processor, a memory, and a communication interface, wherein the memory is used to store one or more computer programs, and the processor is used to call the computer program in the memory so that the terminal device executes part or all of the steps in the method of the first aspect or the second aspect.

[0014] In the tenth aspect, a network device is provided, comprising a processor, a memory, and a communication interface, wherein the memory is used to store one or more computer programs, and the processor is used to call the computer program in the memory so that the network device executes part or all of the steps in the method of the third aspect or the fourth aspect.

[0015] In an eleventh aspect, an embodiment of the present application provides a communication system, which includes the above-mentioned terminal device and / or network device. In another possible design, the system may also include other devices that interact with the terminal device or network device in the solution provided in the embodiment of the present application.

[0016] In the twelfth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores a computer program, and the computer program enables a terminal device or a network device to execute part or all of the steps in the methods of the above aspects.

[0017] In a thirteenth aspect, embodiments of the present application provide a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program, wherein the computer program is operable to cause a terminal device or a network device to perform some or all of the steps of the methods described in each of the above aspects. In some implementations, the computer program product may be a software installation package.

[0018] In the fourteenth aspect, an embodiment of the present application provides a chip, which includes a memory and a processor. The processor can call and run a computer program from the memory to implement some or all of the steps described in the methods of the above aspects.

[0019] When a terminal device maintains uplink synchronization with a first TRP, the terminal device can use the first TRP as a reference when determining the uplink synchronization information of the second TRP, taking into account one or more of the following information: the uplink synchronization information of the first TRP, the downlink arrival time difference, and the transmission time difference between the first TRP and the second TRP. Based on this, the terminal device can obtain the uplink synchronization information of the second TRP without initiating a random access process to the second TRP, which is beneficial to reducing uplink resource overhead and transmission latency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 1A to 1C are system architecture diagrams of a communication system to which embodiments of the present application may be applied.

[0021] FIG2 is an example diagram showing the relationship between uplink frames and downlink frames in a TA scenario.

[0022] FIG3 is an example diagram of the format of a MAC CE carrying a TAC.

[0023] FIG4 is another example diagram of the format of a MAC CE carrying a TAC.

[0024] FIG5 is an example diagram of the format of a MAC RAR carrying a TAC.

[0025] FIG6 is a flow chart of a four-step random access process.

[0026] FIG7 is an example diagram of a multi-TRP scenario applicable to an embodiment of the present application.

[0027] FIG8 is a flowchart of a method for wireless communication provided in an embodiment of the present application.

[0028] FIG9 is an example diagram of determining the uplink synchronization information of the second TRP provided in an embodiment of the present application.

[0029] FIG10 is an example diagram of determining the uplink synchronization information of the second TRP provided by another embodiment of the present application.

[0030] FIG11 is a flow chart of a method for wireless communication provided in another embodiment of the present application.

[0031] FIG12 is an example diagram of the format of a MAC CE indicating a transmission time difference provided in an embodiment of the present application.

[0032] FIG13 is an example diagram of the format of a MAC CE indicating a transmission time difference provided by another embodiment of the present application.

[0033] FIG14 is an example diagram of the format of a MAC CE indicating a transmission time difference provided in yet another embodiment of the present application.

[0034] FIG15 is an example diagram of the format of a MAC CE indicating a transmission time difference provided in yet another embodiment of the present application.

[0035] FIG16 is a flow chart of a method for wireless communication provided in yet another embodiment of the present application.

[0036] FIG17 is a flow chart of a method for wireless communication provided in yet another embodiment of the present application.

[0037] FIG18 is a flow chart of a method for wireless communication provided in yet another embodiment of the present application.

[0038] FIG19 is a schematic structural diagram of a terminal device provided in an embodiment of the present application.

[0039] FIG20 is a schematic structural diagram of a terminal device provided in another embodiment of the present application.

[0040] FIG21 is a schematic diagram of the structure of a network device provided in an embodiment of the present application.

[0041] FIG22 is a schematic diagram of the structure of a network device provided in another embodiment of the present application.

[0042] Figure 23 is a schematic structural diagram of the communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] Communication system architecture

[0044] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: global system of mobile communication (GSM) system, code division multiple access (CDMA) system, wideband code division multiple access (WCDMA) system, general packet radio service (GPRS), long term evolution (LTE) system, advanced long term evolution (LTE-A) system, new radio (NR) system, evolution system of NR system, LTE-based access to unlicensed spectrum (LTE-U) system, NR-based access to unlicensed spectrum (NR-U) system, non-terrestrial networks (NTN) system, universal mobile telecommunication system (UMTS), wireless local area networks (WLAN), wireless fidelity (WLAN), etc. fidelity, WiFi), fifth-generation communication (5G) systems or other communication systems, such as future communication systems, such as sixth-generation mobile communication systems, and satellite communication systems.

[0045] Generally speaking, traditional communication systems support a limited number of connections and are easy to implement. However, with the development of communication technology, mobile communication systems will not only support traditional communications, but will also support, for example, device-to-device (D2D) communication, machine-to-machine (M2M) communication, machine-type communication (MTC), vehicle-to-vehicle (V2V) communication, or vehicle-to-everything (V2X) communication, and the embodiments of the present application can also be applied to these communication systems.

[0046] The communication system in the embodiment of the present application can be applied to a carrier aggregation (CA) scenario, a dual connectivity (DC) scenario, and a standalone (SA) networking scenario.

[0047] The communication system in the embodiment of the present application can be applied to an unlicensed spectrum, where the unlicensed spectrum can also be considered as a shared spectrum; or, the communication system in the embodiment of the present application can also be applied to an authorized spectrum, where the authorized spectrum can also be considered as a dedicated spectrum.

[0048] The embodiments of the present application can be applied to NTN systems as well as terrestrial networks (TN) systems. As an example and not a limitation, NTN systems include NR-based NTN systems and IoT-based NTN systems.

[0049] The embodiments of the present application describe various embodiments in conjunction with network devices and terminal devices, where the terminal device may 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, etc.

[0050] In an embodiment of the present application, the terminal device may be a station (STATION, ST) in a WLAN, a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA) device, a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a next-generation communication system such as a terminal device in an NR network, or a terminal device in a future-evolved public land mobile network (PLMN) network, etc.

[0051] In an embodiment of the present application, a terminal device may 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 connection capabilities, an in-vehicle device, etc. The terminal device in the embodiment of the present application may be a mobile phone, a tablet computer, a laptop computer, a PDA, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, etc. Optionally, the terminal device can be used to act as a base station. For example, the terminal device can act as a scheduling entity that provides sidelink signals between terminal devices in V2X or D2D, etc. For example, a cellular phone and a car communicate with each other using sidelink signals. Cellular phones and smart home devices communicate with each other without relaying the communication signal through a base station.

[0052] As an example and not a limitation, in an embodiment of the present application, the terminal device may be a wearable device. Wearable devices may also be referred to as wearable smart devices, which are a general term for wearable devices that are intelligently designed and developed using wearable technology for daily wear, such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothes or accessories. Wearable devices are not only hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include those that are fully functional, large in size, and can achieve complete or partial functions without relying on smartphones, such as smart watches or smart glasses, as well as those that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various smart bracelets and smart jewelry for vital sign monitoring.

[0053] The network device in the embodiments of the present application may be a device for communicating with a terminal device, and may also be referred to as an access network device or a radio access network device. For example, the network device may be a base station. The network device in the embodiments of the present application may refer to a radio access network (RAN) node (or device) that connects a terminal device to a wireless network. A base station may broadly cover various names as follows, or be replaced with the following names, such as: NodeB, evolved NodeB (eNB), next generation NodeB (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master station MeNB, secondary station SeNB, multi-standard radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. A base station may be a macro base station, a micro base station, a relay node, a donor node, or the like, or a combination thereof. The base station may also refer to a communication module, modem or chip used to be set in the aforementioned device or apparatus. The base station may also be a mobile switching center and a device to device D2D, vehicle-to-everything (V2X), machine-to-machine (M2M) communication device that performs the base station function, a network side device in a 6G network, a device that performs the base station function in a future communication system, etc. The base station may support networks with the same or different access technologies. The embodiments of the present application do not limit the specific technology and specific device form adopted by the network equipment.

[0054] 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 based on the location of the mobile base station. In other examples, a helicopter or drone can be configured to act as a device that communicates with another base station.

[0055] In some deployments, the network device in the embodiments of the present application may refer to a CU or a DU, or the network device may include a CU and a DU. The gNB may also include an AAU.

[0056] Network devices and terminal devices can be deployed on land, including indoors or outdoors, handheld, wearable, or in vehicles; they can also be deployed on water (such as ships); they can also be deployed in the air (such as aircraft, balloons, and satellites). The embodiments of this application do not limit the scenarios in which network devices and terminal devices are located.

[0057] As an example and not a limitation, in an embodiment of the present application, the network device may have a mobile feature, for example, the network device may be a mobile device. In some embodiments of the present application, the network device may be a satellite or a balloon station. For example, the satellite may be a low earth orbit (LEO) satellite, a medium earth orbit (MEO) satellite, a geostationary earth orbit (GEO) satellite, a high elliptical orbit (HEO) satellite, etc. In some embodiments of the present application, the network device may also be a base station set up in a location such as land or water.

[0058] In an embodiment of the present application, the network device can provide services for a cell, and the terminal device communicates with the network device through the transmission resources used by the cell (for example, frequency domain resources, or spectrum resources). The cell can be a cell corresponding to the network device (for example, a base station). The cell can belong to a macro base station or a base station corresponding to a small cell. The small cells here may include: metro cells, micro cells, pico cells, femto cells, etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.

[0059] For example, Figure 1A is a schematic diagram of the architecture of a communication system provided in an embodiment of the present application. As shown in Figure 1A, the communication system 100 may include a network device 110, which may be a device that communicates with a terminal device 120 (or also referred to as a communication terminal or terminal). The network device 110 may provide communication coverage for a specific geographic area and may communicate with terminal devices located within the coverage area.

[0060] Figure 1A exemplarily shows a network device and two terminal devices. In some embodiments of the present application, the communication system 100 may include multiple network devices and each network device may include other numbers of terminal devices within its coverage area, which is not limited in the embodiments of the present application.

[0061] For example, FIG1B is a schematic diagram of the architecture of another communication system provided in an embodiment of the present application. Referring to FIG1B , the communication system includes a terminal device 120 and a satellite 110a, and wireless communication can be performed between the terminal device 120 and the satellite 110a. The network formed between the terminal device 120 and the satellite 110a can also be referred to as an NTN. In the architecture of the communication system shown in FIG1B , the satellite 110a can have the function of a base station, and the terminal device 120 and the satellite 110a can communicate directly. In this communication system architecture, the satellite 110a can be referred to as a network device. In some embodiments, the communication system can include multiple network devices 110a, and each network device 110a can include a different number of terminal devices within its coverage area, which is not limited in the embodiments of the present application.

[0062] For example, FIG1C is a schematic diagram of the architecture of another communication system provided in an embodiment of the present application. Referring to FIG1C , the communication system includes a terminal device 120, a satellite 130, and a base station 110b. Wireless communication can be performed between the terminal device 120 and the satellite 130, and communication can be performed between the satellite 130 and the base station 110b. The network formed between the terminal device 120, the satellite 130, and the base station 110b can also be referred to as an NTN. In the architecture of the communication system shown in FIG1C , the satellite 130 may not have the function of a base station, and the communication between the terminal device 120 and the base station 110b needs to be relayed through the satellite 130. In this system architecture, the base station 110b can be referred to as a network device. In some embodiments of the present application, the communication system may include multiple network devices 110b, and each network device 110b may include a different number of terminal devices within its coverage area, which is not limited in the embodiments of the present application.

[0063] It should be noted that Figures 1A-1C are only examples of the system to which this application is applicable. Of course, the method shown in the embodiment of this application can also be applied to other systems, such as 5G communication systems, LTE communication systems, etc., and the embodiment of this application does not make specific limitations on this.

[0064] In some embodiments of the present application, the wireless communication system shown in Figures 1A-1C may also include other network entities such as a mobility management entity (MME) and an access and mobility management function (AMF), but the embodiments of the present application are not limited to this.

[0065] It should be understood that in the embodiments of the present application, a device having a communication function in a network / system may be referred to as a communication device. Taking the communication system 100 shown in FIG1A as an example, the communication device may include a network device 110 and a terminal device 120 having a communication function. The network device 110 and the terminal device 120 may be the specific devices described above and will not be described in detail here. The communication device may also include other devices in the communication system 100, such as a network controller, a mobility management entity, and other network entities, which are not limited in the embodiments of the present application.

[0066] It should be understood that the "indication" mentioned in the embodiments of this application can be a direct indication, an indirect indication, or an indication of an association. For example, "A indicates B" can mean that A directly indicates B, for example, B can be obtained through A; it can also mean that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also mean that there is an association between A and B.

[0067] In the description of the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship between indication and being indicated, configuration and being configured, etc.

[0068] The “configuration” in the embodiment of the present application may include configuration through at least one of system messages, radio resource control (RRC) signaling and media access control element (MAC CE).

[0069] In some embodiments of the present application, "predefined" or "preset" may be implemented by pre-storing corresponding codes, tables, or other methods that can be used to indicate relevant information in a device (e.g., a terminal device or a network device). The present application does not limit the specific implementation method. For example, predefined may refer to information defined in a protocol.

[0070] In some embodiments of the present application, the "protocol or standard" may refer to a standard protocol in the field of communications, for example, it may include an LTE protocol, an NR protocol, and related protocols used in future communication systems, and this application does not limit this.

[0071] For ease of understanding, some relevant technical knowledge involved in the embodiments of this application is first introduced. The following related technologies can be combined with the technical solutions of the embodiments of this application as optional solutions, and they all fall within the scope of protection of the embodiments of this application. The embodiments of this application include at least part of the following contents.

[0072] Uplink synchronization

[0073] Uplink synchronization is the process by which uplink signals from terminal devices located at different locations within a serving cell, using the same timeslot, arrive at the network equipment's receiving antenna simultaneously. This means that signals from different terminal devices in the same timeslot arrive at the network equipment's receiving antenna in sync. The purpose of uplink synchronization is to reduce uplink multi-access interference and multipath interference between terminal devices within the serving cell.

[0074] During the uplink synchronization process, the terminal device can perform uplink synchronization with the network device according to the uplink synchronization information corresponding to the network device. The uplink synchronization information may include TA, for example.

[0075] Timing Advance (TA)

[0076] TA is usually used for uplink transmission, and can refer to the system frame in which the terminal device sends uplink data a certain amount of time ahead of the corresponding downlink frame. For example, the timing advance of the terminal device is based on the first path of the downlink channel received by the terminal device (that is, the first symbol of the time slot where the channel is located) as the downlink reference, and the transmission is carried out in advance on this basis. Figure 2 shows the relationship between the uplink frame and the downlink frame. Referring to Figure 2, taking the terminal device working in the single TRP (single-TRP, sTRP) mode as an example, the reference point of the TA of the terminal device is the downlink reception time point of the terminal device as the starting point, and the uplink channel or signal is sent a certain amount of time (TA) in advance.

[0077] Taking the carrier aggregation scenario as an example, the terminal device can support different carriers (also known as "serving cells"). Different carriers can have different TAs, so the concept of timing advance group (TA group, TAG) is introduced. Generally, a TAG can include the TAs of one or more serving cells. The TAG containing a special cell (Spcell) can be called a primary timing advance group (PTAG), and accordingly, other TAGs except PTAG can be called secondary timing advance groups (STAG). Among them, the Spcell can include a primary cell (PCell) or a primary secondary cell (PSCell).

[0078] Current communication standards (including NR, 3GPP Rel.17, etc.) stipulate that in a cell group (CG), a terminal device can be configured with up to 4 TAGs. The RRC configuration for configuring TAGs can be expressed as:

[0079]

[0080]

[0081] Generally, RRC configuration may include TAG configuration (expressed by "TAG-Config"), TAG information (expressed by "TAG"), TAG identification (expressed by "TAG-Id") and TA timer (expressed by "TimeAlignmentTimer"). Among them, TAG configuration may include a release list (expressed by "tag-ToReleaseList") and a TAG addition list (expressed by "tag-ToAddModList"). TAG information may include a TAG identification (expressed by "tag-Id") and a TA timer (expressed by "timeAlignmentTimer"). The duration corresponding to the TA timer may be listed in an enumerated manner, including {500ms, 750ms, 1280ms, 1920ms, 2560ms, 5120ms, 10240ms, infinity}.

[0082] Typically, the validity of a TA can be maintained using a TA timer. That is, when a terminal device receives information indicating a TA (or a TA command (TAC)) from a network device, the terminal device can start or restart the TA timer. If the TA timer has not expired, the TA maintained by the TA timer is valid, and the terminal device can communicate with the network device based on the TA. Conversely, if the TA timer expires, the TA maintained by the TA timer becomes invalid (or in other words, ineffective), and the terminal device can no longer communicate with the network device based on the TA.

[0083] It should be noted that a CG may include multiple service cells, and each service cell will be assigned a TAG identifier.

[0084] The calculation method of TA is introduced below.

[0085] In some implementations, TA can be calculated by the formula (N TA +N TA，offset )×T c Calculate, where N TA，offset Indicates timing advance offset (TA offset), N TA Indicates TA adjustment amount, T c Indicates the minimum time unit in a communication system (e.g., NR system). Usually, T c =1 / (4096×480kHz).

[0086] Typically, in a CG, each serving cell can be pre-configured with an N TA，offset In addition, N TA This may be performed based on a pre-configured offset.

[0087] In some implementations, N TA The MAC CE of the network device can provide differential adjustment, that is, the current TA adjustment (also known as "new TA", expressed as ) is the last TA (also called "old TA", expressed as ) is used as the basis for adjustment forward or backward in time. The adjustment calculation formula is as follows:

[0088]

[0089] In other words, is the TA adjustment amount used before receiving TAC, is the updated TA adjustment amount after receiving TAC. A It is determined based on TAC. In addition, the granularity of the TA adjustment can be TAG.

[0090] Figure 3 shows the format of a MAC CE carrying a TAC. Referring to Figure 3, the MAC CE may include a TAG identifier (TAG ID) field and a TAC field. Typically, the TAG ID field may be 2 bits long, and the identifier of the TAG containing the SpCell is 0. The TAC field is used to indicate a TA index value TA (0, 1, 2…63), which is used to control the timing adjustment amount that the MAC entity must apply (as specified in TS38.213 [6]). The length of this field may be 6 bits.

[0091] In other implementations, the TA adjustment method can be based on the absolute value of the TA (also known as "absolute TA"), that is, there is no need to consider the previous TA adjustment value. The network device can directly provide an absolute TA through the payload of the absolute MAC CE (Absolute MAC CE) or the MAC random access response (MAC RAR). The absolute TA can be expressed as "N TA "Indicates. Generally, the absolute TA value range can be 0 to 3846. Accordingly, TA can be calculated by the formula: N TA =T A ×16×64×2 μ Calculate, where T A It is determined based on TAC.

[0092] In some scenarios, the above absolute TA and T A The acquisition method occurs during the random access process. The acquired TA is applicable to the TAG corresponding to the target cell of the random access. Therefore, the signaling carrying the TAC may not include the TAG-ID. For example, the absolute MAC CE can be used in the two-step random access process, and the two-step random access can be initiated to the SpCell. Therefore, the absolute MAC CE is applicable to the PTAG corresponding to the MAC entity, that is, the PTAG includes the SpCell.

[0093] Figure 4 shows the format of a MAC CE carrying a TAC. Referring to Figure 4, the length of a MAC CE may be 2 bytes, or 16 bits. The MAC CE may include a TAC field, which may occupy 12 bits. This field is used to indicate the TA index value of the time adjustment applied by the MAC entity. Additionally, the remaining 4 bits in the MAC CE may be reserved (indicated by "R") and may be set to 0.

[0094] Figure 5 shows the format of a MAC RAR that carries a TAC. Referring to Figure 5 , the length of the MAC RAR may be 7 bytes, or 56 bits. The first byte (denoted by "Oct 1") may include a TAC field, which may occupy 7 bits. This field is used to indicate the TA index value of the time adjustment applied by the MAC entity. The remaining 1 bit in Oct 1 may be a reserved bit (denoted by "R") and may be set to 0.

[0095] The second byte (indicated by "Oct 2") may continue to include the TAC field, which may occupy 5 bits. The remaining 3 bits in Oct 2 may carry an uplink grant (UL Grant).

[0096] The third to fifth bytes (indicated by "Oct 3-5") can continue to carry the uplink grant (UL Grant). The sixth to seventh bytes (indicated by "Oct 6-7") can carry the temporary cell-radio network temporary identifier (C-RNTI).

[0097] Random access process

[0098] A terminal device can establish a connection with a cell and obtain uplink synchronization information by initiating a random access procedure. Random access can include a four-step random access procedure and a two-step random access procedure. The following briefly describes the random access process using the four-step random access procedure as an example.

[0099] As shown in FIG6 , the four-step random access process may include steps S610 to S640 .

[0100] In step S610, the terminal device sends a random access request to the network device. The random access request may include a random access preamble. The random access request may also be referred to as the first message or message 1 (Msg1) in the random access process.

[0101] In step S620, after detecting the random access preamble sent by the terminal device, the network device sends a RAR message to the terminal device. The RAR message can also be called the second message or message 2 (Msg2) in the random access process.

[0102] In some embodiments, the RAR may include a TAC field to indicate uplink synchronization information between the terminal device and the network device. In this way, the terminal device can obtain an initial TA value through the RAR message during the initial access process.

[0103] In step S630, the terminal device sends Message 3 (Msg3) to the network device. Message 3 can be used to notify the network device of the event that triggered the random access procedure. For example, if the event is the initial random access procedure, Message 3 will carry the terminal device identifier and establishment cause; if the event is RRC reestablishment, it will carry the connected terminal device identifier and establishment cause.

[0104] In step S640, the network device sends message 4 (Msg4) to the terminal device. Message 4 can be used for conflict resolution, and therefore, message 4 can also be called a contention resolution message.

[0105] Scheduling in multi-TRP (mTRP) scenarios

[0106] As shown in Figure 7, in the multiple DCI-multi-TRP (mDCI-mTRP) scenario, each TRP can schedule its physical downlink shared channel (PDSCH) transmission using its own downlink control information (DCI). That is, TRP1 can schedule the transmission of PDSCH1 using DCI carried by PDCCH1, and TRP2 can schedule the transmission of PDSCH2 using DCI carried by PDCCH2.

[0107] The applicant believes that in the subsequent evolution of the protocol, each TRP may also schedule its own PUSCH transmission. Continuing with Figure 7, TRP1 can schedule PUSCH1 transmission via DCI carried by PDCCH1, and TRP2 can schedule PUSCH2 transmission via DCI carried by PDCCH2.

[0108] It should be noted that in the mDCI-mTRP scenario, the demand for DCI is large and each TRP is scheduled independently, so the number of control resource sets (CORESETs) associated with DCI is increased. In some implementations, CORESETs can be grouped by their corresponding RRC parameter "control resource set pool index (CORESETPoolIndex)", that is, control resource sets with CORESETPoolIndex of "0" can be grouped into one group, corresponding to TRP1. Control resource sets with CORESETPoolIndex of "1" can be grouped into one group, corresponding to TRP2. In addition, when the network device does not configure CORESETPoolIndex for the control resource set, CORESETPoolIndex can be defaulted to "0".

[0109] In addition, if the terminal device operates in sTRP mode, the reference point of the terminal device's timing advance is calculated from the downlink reception time point. In the mTRP scenario, the terminal device can still use one of the two TRPs as the reference point for downlink reception to adjust the TA. For example, use the TRP with CORESETPoolIndex of 0 as the reference point for downlink reception. Or the network device can configure a specific TRP as the reference point for downlink reception. In this way, the premise based on a single downlink reference point can be that the terminal device has only one set of downlink reception timelines, which depends on the capabilities of the terminal device.

[0110] Of course, for terminal devices with stronger capabilities, two different downlink reception reference points can also be used. Continuing with Figure 7, the two TRPs can correspond to different downlink reference points, and the two TA values ​​indicated by the network device are adjusted based on their respective reference points.

[0111] Uplink multi-TRP operation

[0112] In current communication protocols (for example, 3GPP Rel.17), the repetition transmission of uplink PUCCH / PUSCH based on multiple TRPs is supported, with the aim of enhancing uplink coverage and transmission reliability. The terminal device needs to send physical uplink control channels (PUCCH) / physical uplink shared channels (PUSCH) carrying the same content to different TRPs. For repeated transmission of PUSCH, the current standard only supports repeated transmission of PUSCH based on sDCI, which uses a timing advance TA to sequentially send PUSCH to different TRPs. For repeated transmission of PUSCH based on mDCI, since there may not be a sufficiently ideal backhaul line (backhaul) as a connection between multiple TRPs, the independent scheduling of terminal devices by multiple TRPs may cause different PUSCH / PUCCH to overlap in time.

[0113] In addition, 3GPP is currently developing a mechanism for multiple antenna panels of terminal devices to transmit PUCCH / PUSCH to multiple TRPs simultaneously. However, even with multiple uplink transmit antenna panels and multiple TRP reception, terminal devices can only use the same uplink synchronization information (for example, using the same TA value) to perform early transmission of PUSCH / PUCCH (regardless of whether it is transmitted to one TRP or to two TRPs) within a serving cell.

[0114] As mentioned above, the traditional uplink synchronization information between terminal devices and TRPs is based on the granularity of the serving cell. This method of determining the uplink synchronization information of the TRP based on the granularity of the serving cell may be too coarse, resulting in interference when the terminal device communicates with the TRP based on the uplink synchronization information corresponding to the serving cell to which the TRP belongs.

[0115] For example, if a service cell includes multiple TRPs, different TRPs may be at different distances from the terminal device. At this time, if the terminal device still sends uplink signals to multiple TRPs in the service cell based on the uplink synchronization information corresponding to the service cell, this may cause interference after the uplink signal reaches the TRP.

[0116] In addition, there may be synchronization errors between different TRPs. In this case, even if the distance between the terminal device and different TRPs is the same, the terminal device sends an uplink signal to the different TRP based on the same uplink synchronization information, which may cause interference after the uplink signal reaches the TRP.

[0117] Based on this, in some communication systems, the uplink synchronization information between the terminal device and the TRP can be determined at the TRP granularity. In other words, the terminal device may need to determine the uplink synchronization information of each TRP separately for different TRPs. For example, the TA (TRP-specific TA) corresponding to each TRP can be determined (e.g., configured or adjusted) at the TRP granularity. In this case, how to determine the uplink synchronization information between the terminal device and the TRP is an urgent problem to be solved.

[0118] As a possible implementation method, the terminal device can access the TRP by initiating a random access process to obtain the uplink synchronization information of the TRP. However, the method in which the terminal device obtains the uplink synchronization information of the TRP through the random access process is not flexible enough and may result in large uplink resource overhead and extended transmission time.

[0119] To address the above issues, this application proposes two embodiments, both of which can obtain the uplink synchronization information of the TRP without initiating a random access process to the TRP, which is beneficial for reducing uplink resource overhead and transmission delay. The following describes the first and second embodiments respectively.

[0120] To facilitate understanding, the uplink synchronization information of the first TRP and TRP is first introduced.

[0121] First TRP

[0122] The first TRP refers to the TRP that maintains uplink synchronization with the terminal device. For example, it can be the TRP that the terminal device accesses when it initially accesses the service cell.

[0123] In a multi-TRP scenario, the terminal device may maintain uplink synchronization with one or more TRPs at the same time. In this case, the first TRP can be any one of the one or more TRPs that maintain uplink synchronization with the terminal device, and the embodiments of the present application are not limited to this.

[0124] When the terminal device maintains uplink synchronization with the first TRP, in certain scenarios, the network side can add one or more new TRPs (for example, the second TRP mentioned later) to provide services to the terminal device based on the needs of uplink and downlink transmission (for example, to improve transmission reliability or spectrum efficiency).

[0125] In some embodiments, the newly added TRP may be located in the same cell as the first TRP. In some embodiments, the newly added TRP may be located in a different cell than the first TRP.

[0126] Taking the first TRP as the TRP that the terminal device initially accesses when accessing the serving cell as an example, after the terminal device initially accesses the serving cell, it enters the single TRP operation mode and completes uplink synchronization with the first TRP. After the terminal device completes uplink synchronization with the first TRP, the first TRP can serve as the serving TRP (equivalent to a base station) that sends a channel to the terminal device and communicate with the terminal device.

[0127] After the terminal device enters the single TRP operation mode, the network side can configure the terminal device to the multi-TRP operation mode as needed to add a new TRP to provide services for the terminal device, for example, adding one or more TRPs in the same cell to provide services for the terminal device.

[0128] When a terminal device is configured in a multi-TRP operation mode, multiple TRPs connected to the terminal device can provide services to the terminal device at the same time. The multiple TRPs can communicate with each other, for example, through wired or wireless connections.

[0129] In some embodiments, the network side can configure the terminal device to a multi-TRP operation mode through RRC signaling.

[0130] TRP uplink synchronization information

[0131] Before a terminal device needs to communicate uplink with a TRP (send uplink signaling or uplink data), the terminal device should perform uplink synchronization with the TRP to avoid interference between uplink signals sent to the TRP by different terminal devices. Therefore, the terminal device needs to perform uplink synchronization with the TRP based on the acquired uplink synchronization information of the TRP. The uplink synchronization information of the TRP can be understood as the uplink synchronization information between the terminal device and the TRP, or as the uplink synchronization information corresponding to the terminal device and the TRP.

[0132] The uplink synchronization of the terminal device with the TRP based on the uplink synchronization information of the TRP can be understood as that the system frame in which the terminal device sends uplink data should be a certain time ahead of the corresponding downlink frame. For example, uplink synchronization can be ensured by adjusting the uplink transmission time of the terminal device. It should be understood that the adjustment of the uplink transmission time by the terminal device is aimed at aligning the time received by the network side. The alignment here includes that multiple terminal devices should arrive at the network side as simultaneously as possible, and also includes the alignment of the boundary between the downlink transmission time slot and the uplink reception time slot on the network side.

[0133] The embodiment of the present application does not limit the type of uplink synchronization information of the TRP. For example, the uplink synchronization information of the TRP may refer to the TA corresponding to the TRP (or the TA between the TRP and the terminal device), such as the uplink synchronization information of the first TRP may refer to the TA corresponding to the first TRP. Alternatively, the uplink synchronization information of the TRP may refer to the one-way transmission delay from the TRP to the terminal device (or the one-way transmission delay between the terminal device and the TRP), such as the uplink synchronization information of the first TRP may refer to the one-way transmission delay from the first TRP to the terminal device. In some embodiments, the one-way transmission delay may also be called the one-way propagation delay, which is not limited in the embodiment of the present application.

[0134] In the embodiment of the present application, the TA corresponding to the TRP can be understood as twice the one-way transmission delay from the TRP to the terminal device.

[0135] Based on the above introduction to related concepts, the first and second embodiments are introduced in sequence below.

[0136] Example 1:

[0137] Embodiment 1 aims to determine the uplink synchronization information of other TRPs outside the first TRP with reference to the first TRP, thereby eliminating the need to initiate a random access process to other TRPs to obtain the uplink synchronization information of other TRPs.

[0138] In some embodiments, a solution for acquiring uplink synchronization information without using a random access procedure may also be referred to as a RACH-less uplink synchronization information acquisition solution.

[0139] The following describes, in conjunction with Figure 8, the process of determining the uplink synchronization information of other TRPs using the first TRP as a reference in an embodiment of the present application.

[0140] FIG8 is a flow chart of a method for wireless communication provided by an embodiment of the present application. The method shown in FIG8 can be performed by a terminal device or a network device, and this embodiment of the present application is not limited thereto. The terminal device and the network device can be, for example, the terminal device 120 and the network device 110 shown in FIG1 (e.g., the network device 110 in FIG1A , the satellite 110a in FIG1B , and the base station 110b in FIG1C ). The method shown in FIG8 includes step S810, which is described in detail below.

[0141] In step S810, when the terminal device maintains uplink synchronization with the first TRP, the uplink synchronization information of the second TRP is determined.

[0142] The second TRP can be understood as a new TRP configured by the network side for the terminal device so that it can provide services to the terminal device together with the first TRP. The second TRP and the first TRP can be located in the same cell or in different cells, which is not limited in this embodiment of the application.

[0143] In some embodiments, the terminal device has not yet accessed the second TRP, or in other words, the terminal device has not yet performed uplink synchronization with the second TRP. However, the embodiments of the present application are not limited thereto. When the terminal device has accessed the second TRP (or in other words, the uplink synchronization information of the second TRP needs to be updated after the terminal device accesses the second TRP), the uplink synchronization information of the second TRP may also be determined with reference to the first TRP.

[0144] In some embodiments, the first TRP and the second TRP are synchronized with respect to downlink transmission of the terminal device. In other words, the transmission timing difference between the first TRP and the second TRP is 0 (or, there is no transmission timing difference between the first TRP and the second TRP).

[0145] In some embodiments, the first TRP and the second TRP are asynchronous with respect to the downlink transmission of the terminal device. In other words, the transmission time difference between the first TRP and the second TRP is a non-zero value. This is because there may be a clock deviation between the first TRP and the second TRP (for example, a clock deviation caused by an imperfect return line between the first TRP and the second TRP or hardware limitations of the network device), which makes the downlink time synchronization between the first TRP and the second TRP have certain unpredictable errors. In an embodiment of the present application, the clock deviation between the first TRP and the second TRP is referred to as the transmission time difference between the first TRP and the second TRP. In some embodiments, the transmission time difference can also be replaced by other names, such as synchronization time difference, downlink transmission time difference (DL Tx time gap), downlink transmission time difference, etc. This application is not limited to this, as long as it indicates that there is a clock deviation between different TRPs.

[0146] In some embodiments, determining the uplink synchronization information of the second TRP with reference to the first TRP may mean that, when determining the uplink synchronization information of the second TRP, information related to the first TRP may be considered. Specifically, the uplink synchronization information of the second TRP may be determined based on one or more of the following information.

[0147] Information 1: Uplink synchronization information of the first TRP.

[0148] The uplink synchronization information of the first TRP may refer to the TA corresponding to the first TRP, or may refer to the one-way transmission delay from the first TRP to the terminal device.

[0149] In some embodiments, the type of the uplink synchronization information of the first TRP and the type of the uplink synchronization information of the second TRP may be the same, for example, the uplink synchronization information of the first TRP refers to the TA corresponding to the first TRP, and the uplink synchronization information of the second TRP refers to the TA corresponding to the second TRP. In some embodiments, the type of the uplink synchronization information of the first TRP and the type of the uplink synchronization information of the second TRP may be different, for example, the uplink synchronization information of the first TRP refers to the TA corresponding to the first TRP, and the uplink synchronization information of the second TRP refers to the one-way transmission delay from the second TRP to the terminal device.

[0150] Information 2: Downlink timing difference

[0151] The downlink arrival time difference is used to indicate the difference between the time when the signal from the first TRP reaches the terminal device and the time when the signal from the second TRP reaches the terminal device. In other words, the downlink arrival time difference represents the difference between the downlink arrival time from the first TRP to the terminal device (the time when the signal sent by the first TRP reaches the terminal device) and the downlink arrival time from the second TRP to the terminal device.

[0152] In some embodiments, the downlink arrival time difference can also be represented by the downlink reception time of the terminal device, that is, the difference between the time when the terminal device receives the signal sent by the first TRP and the time when the terminal device receives the signal sent by the second TRP.

[0153] In some embodiments, the downlink arrival time difference can be determined based on the terminal device's measurement of the reference signal. Please see the following text for details and will not be repeated here.

[0154] In some embodiments, the downlink arrival time from the TRP to the terminal device is associated with the distance from the TRP to the terminal device. For example, if the distance from the first TRP to the terminal device is the same as the distance from the second TRP to the terminal device, the downlink arrival time difference can be considered to be zero. Alternatively, if the distance from the first TRP to the terminal device is different from the distance from the second TRP to the terminal device, the downlink arrival time difference can be considered to be a non-zero value.

[0155] Information 3: The transmission time difference between the first TRP and the second TRP.

[0156] The transmission time difference between the first TRP and the second TRP is used to indicate the synchronization information of the downlink transmission of the first TRP and the second TRP relative to the terminal device (or the clock deviation information between the first TRP and the second TRP). For example, when the transmission time difference between the first TRP and the second TRP is 0, it can be understood that the downlink transmission of the first TRP and the second TRP relative to the terminal device is synchronized, or the clock information between the first TRP and the second TRP is consistent. For another example, when the transmission time difference between the first TRP and the second TRP is a non-zero value, it can be understood that the downlink transmission of the first TRP and the second TRP relative to the terminal device is not synchronized, or the clock information between the first TRP and the second TRP is inconsistent.

[0157] In some embodiments, the transmission time difference between the first TRP and the second TRP may refer to the difference between the time reference information of the first TRP and the time reference information of the second TRP. Optionally, the time reference information of the first TRP may be indicated by the downlink transmission time of the first TRP, and the time reference information of the second TRP may be indicated by the downlink transmission time of the second TRP.

[0158] In some embodiments, the transmission time difference between the first TRP and the second TRP can be determined based on the system information of the first TRP and the second TRP or the time reference information included in the dedicated signaling. This application does not limit the system information of the TRP. For example, the system information can refer to a system information block (SIB).

[0159] In the embodiment of the present application, when a terminal device maintains uplink synchronization with a first TRP, the terminal device can determine the uplink synchronization information of a second TRP with reference to the first TRP. Specifically, one or more of the above-mentioned information 1 to information 3 can be considered when determining the uplink synchronization information of the second TRP. Based on this, the terminal device can obtain the uplink synchronization information of the second TRP without initiating a random access process to the second TRP, which is beneficial for reducing uplink resource overhead and lowering transmission delay.

[0160] In some embodiments, the uplink synchronization information of the second TRP can be determined based on the above information 1 and information 2. For example, when the downlink transmission of the first TRP and the second TRP relative to the terminal device is synchronized, the uplink synchronization information of the second TRP can be directly determined based on information 1 and information 2.

[0161] In some embodiments, the uplink synchronization information of the second TRP can be jointly determined based on the above information 1, information 2 and information 3, that is, the uplink synchronization information of the second TRP is determined based on the uplink synchronization information of the first TRP, the downlink arrival time difference, and the transmission time difference between the first TRP and the second TRP. For example, in the case where the downlink transmission of the first TRP and the second TRP relative to the terminal device is synchronized, it can be considered that the transmission time difference between the first TRP and the second TRP is 0, and the uplink synchronization information of the second TRP is jointly determined based on information 1, information 2 and information 3. Alternatively, in the case where the downlink transmission of the first TRP and the second TRP relative to the terminal device is not synchronized, it can be considered that the transmission time difference between the first TRP and the second TRP is a non-zero value, and the uplink synchronization information of the second TRP is jointly determined based on information 1, information 2 and information 3.

[0162] As an implementation method, if the uplink synchronization information of the second TRP is determined based on the above information 1, information 2 and information 3, and the uplink synchronization information of the second TRP is the TA corresponding to the second TRP, the uplink synchronization information of the second TRP can be expressed as twice the target value, where the target value is equal to the sum of the one-way transmission delay (the one-way transmission delay from the first TRP to the terminal device) and the difference between the transmission time difference (the transmission time difference between the first TRP and the second TRP) and the downlink arrival time difference.

[0163] It should be understood that the transmission time difference between the first TRP and the second TRP and the downlink arrival time difference are relative concepts. Therefore, the subtraction or addition operations mentioned above are not absolute. For example, the subtraction operation can be understood as the summation with a negative value.

[0164] Taking the transmission time difference between the first TRP and the second TRP as an example, it can refer to the reference time of the second TRP minus the reference time of the first TRP. If the reference time of the second TRP is later than the reference time of the first TRP, the transmission time difference between the first TRP and the second TRP can be expressed as a positive value, and the difference between the one-way transmission delay and the transmission time difference mentioned above can refer to the value obtained by subtracting the transmission time difference from the one-way transmission delay; if the reference time of the second TRP is ahead of the reference time of the first TRP, the transmission time difference between the first TRP and the second TRP can be expressed as a negative value, and the difference between the one-way transmission delay and the transmission time difference mentioned above can refer to the value obtained by subtracting the transmission time difference from the one-way transmission delay (in this case, subtracting the negative value can be understood as the sum with the positive value). Of course, the relevant calculation process of the transmission time difference between the first TRP and the second TRP is similar and will not be repeated here.

[0165] As described above, the downlink transmission of the first TRP and the second TRP relative to the terminal device can be synchronous or asynchronous. The following is an exemplary introduction on how to determine the uplink synchronization information of the second TRP for these two situations.

[0166] Case 1: The first TRP and the second TRP are synchronized with respect to the downlink transmission of the terminal device

[0167] Figure 9 gives an example of determining the uplink synchronization information of the second TRP. In the example of Figure 9, the first TRP and the second TRP are synchronized with the downlink transmission of the terminal device (that is, DL Tx1 and DL Tx2 in Figure 9 are aligned, where DL Tx represents downlink transmission and DL RX represents downlink reception). In this case, if the uplink synchronization information of the first TRP is different from the uplink synchronization information of the second TRP, it may be because the propagation delay from the terminal device to the first TRP is different from the propagation delay from the terminal device to the second TRP. Specifically, assuming that the one-way transmission delays of the first TRP and the second TRP to the terminal device are Δ0 and Δ1 respectively, then for the terminal device, the values ​​of the TA corresponding to the first TRP and the TA corresponding to the second TRP should be 2Δ0 and 2Δ1 respectively to compensate for the round-trip transmission delay.

[0168] Assuming that the terminal device has already performed uplink synchronization with the first TRP (for example, by configuring or updating the uplink synchronization information of the first TRP through the initial access MAC RAR and subsequent MAC CE), in this case, the terminal device can determine (for example, by calculation or by indication from the network device) the uplink synchronization information of the first TRP (for example, the single-line propagation delay Δ0 from the first TRP to the terminal device). In this way, as long as the terminal device can determine the downlink arrival time difference, the terminal device can determine the uplink synchronization information of the second TRP according to the following formula.

[0169] When the uplink synchronization information of the second TRP is the TA corresponding to the second TRP, TA1 = 2 (Δ0 + DL timing difference). When the uplink synchronization information of the second TRP is the one-way transmission delay from the second TRP to the terminal device, TA2 = Δ0 + DL timing difference.

[0170] Wherein, Δ0 represents the one-way transmission delay from the first TRP to the terminal device, and DL timing difference represents the downlink arrival time difference.

[0171] Case 2: The first TRP and the second TRP are not synchronized with the downlink transmission of the terminal device

[0172] Figure 10 shows an example of determining the uplink synchronization information of the second TRP. In the example of Figure 10, the downlink transmission of the first TRP and the second TRP relative to the terminal device is asynchronous, that is, there is a transmission time difference between the first TRP and the second TRP, and the transmission time difference is a non-zero value. In this case, if the uplink synchronization information of the first TRP is different from the uplink synchronization information of the second TRP, it may be due to one or more of the following reasons: the propagation delay from the terminal device to the first TRP is different from the propagation delay from the terminal device to the second TRP; the downlink transmission of the first TRP and the second TRP relative to the terminal device is asynchronous.

[0173] Assume that the terminal device has performed uplink synchronization with the first TRP, that is, the terminal device can determine the uplink synchronization information of the first TRP. In this case, the terminal device also needs to determine the downlink arrival time difference and the transmission time difference between the first TRP and the second TRP. Based on this, the terminal device can determine the uplink synchronization information of the second TRP according to the following formula.

[0174] When the uplink synchronization information of the second TRP is the TA corresponding to the second TRP, TA3 = 2 (Δ0-DL time gap + DL timing difference). When the uplink synchronization information of the second TRP is the one-way transmission delay from the second TRP to the terminal device, TA4 = Δ0-DL time gap + DL timing difference.

[0175] Wherein, Δ0 represents the one-way transmission delay from the first TRP to the terminal device, DL time gap represents the transmission time difference between the first TRP and the second TRP, and DL timing difference represents the downlink arrival time difference.

[0176] As described above, both the terminal device and the network device can determine the uplink synchronization information of the second TRP based on the above information 1 to information 3. The following describes how the terminal device and the network device determine the uplink synchronization information of the second TRP based on the above information.

[0177] FIG11 is a flow chart of a method for wireless communication provided by another embodiment of the present application. This flow chart describes how a terminal device determines the uplink synchronization information of a second TRP based on the above information. The method shown in FIG11 is described from the perspective of interaction between a terminal device and a network device.

[0178] When the terminal device determines the uplink synchronization information of the second TRP based on the above information, the terminal device can determine the uplink synchronization information of the first TRP and the downlink arrival time difference by itself, and the transmission time difference between the first TRP and the second TRP can be indicated by the network device.

[0179] In step S1110, the network device sends first information to the terminal device, where the first information is used to indicate the transmission time difference between the first TRP and the second TRP.

[0180] In some embodiments, the first information may be carried in higher layer signaling, such as RRC signaling. In some embodiments, the first information may be carried in lower layer signaling, such as MAC CE.

[0181] In some embodiments, considering that the frequency of changes in the transmission time difference between TRPs may be low, the indication method of the first information can be configured as a semi-static configuration method, for example, semi-static configuration can be performed through high-layer signaling.

[0182] In some embodiments, in order to adjust the transmission time difference of TRP more dynamically, the indication method of the first information can be configured as a dynamic configuration method, for example, dynamic configuration can be performed through low-layer signaling.

[0183] The embodiments of the present application do not limit the manner in which the first information indicates the transmission time difference between the first TRP and the second TRP. In some embodiments, the first information can be indicated in an absolute time manner. Taking the downlink transmission time indication of the TRP as an example, the first information can include the downlink transmission time of the first TRP and the downlink transmission time of the second TRP. After the terminal device receives the first information, it can calculate the transmission time difference between the first TRP and the second TRP based on the downlink transmission time of the first TRP and the downlink transmission time of the second TRP, and the transmission time difference is equal to the difference between the downlink transmission time of the first TRP and the downlink transmission time of the second TRP. In some embodiments, the first information can be indicated in a relative time difference manner. Still taking the downlink transmission time indication of the TRP as an example, the first information can directly include the difference between the downlink transmission time of the first TRP and the downlink transmission time of the second TRP, that is, the first information can directly include the transmission time difference between the first TRP and the second TRP.

[0184] In some embodiments, the first information may be used to indicate a transmission time difference between a first TRP (reference TRP) and multiple target TRPs (the second TRP is one of the multiple target TRPs). In this case, in order to distinguish different target TRPs, the TRP identifier may be used to distinguish different TRPs.

[0185] In some embodiments, the identifier of the TRP may refer to the physical cell identifier (PCI) of the TRP. For TRPs, each TRP has a corresponding PCI. For the scenario of multiple TRPs within a cell (intra-cell), the PCIs corresponding to the multiple TRPs are the same; for the scenario of multiple TRPs between cells (inter-cell), the PCIs corresponding to the multiple TRPs are different. Based on this, in the scenario of multiple TRPs between cells, PCIs can be used to distinguish different TRPs.

[0186] Figure 12 shows the format of a MAC CE indicating a transmission time difference. The example in Figure 12 can be applied to scenarios with multiple TRPs between cells. As shown in Figure 12, the transmission time difference between the reference TRP and the target TRP is indicated in absolute time. Each TRP (including the reference TRP and the target TRP) has a corresponding PCI, and different TRPs can be distinguished by their PCIs.

[0187] Figure 13 shows another format for a MAC CE indicating a transmission time difference. The example in Figure 13 can be applied to scenarios with multiple TRPs between cells. As shown in Figure 13, the transmission time difference between the reference TRP and the target TRP is indicated as a relative time difference. Each TRP (including the reference TRP and the target TRP) has a corresponding PCI, and different TRPs can be distinguished by their PCIs.

[0188] In some embodiments, the TRP identifier may refer to the identifier of the CORESET associated with the TRP. Each TRP is associated with a set of CORESETs. Therefore, the CORESET identifier can be used to indirectly distinguish different TRPs. Based on this, in the scenario of multiple TRPs in a cell, the CORESET identifier can be used to distinguish different TRPs.

[0189] In some embodiments, the CORESET identifier refers to the RRC parameter "CORESETPoolIndex" corresponding to the CORESET. That is, the CORESETPoolIndex parameter can be used to distinguish different TRPs. Considering that CORESETPoolIndex can only take the value 0 or 1, corresponding to two different TRPs respectively, CORESETPoolIndex can be used to distinguish two different TRPs.

[0190] Figure 14 shows another format for a MAC CE indicating a transmission time difference. The example in Figure 14 can be applied to scenarios with multiple TRPs within a cell. As shown in Figure 14, the transmission time difference between the reference TRP and the target TRP is indicated in absolute time. The reference TRP and the target TRP can be distinguished by the CORESETPoolIndex associated with each TRP.

[0191] Figure 15 shows another format of a MAC CE indicating a transmission time difference. The example of Figure 15 can be applied to scenarios with multiple TRPs within a cell. As shown in Figure 15, the transmission time difference between the reference TRP and the target TRP is indicated as a relative time difference. The reference TRP and the target TRP can be distinguished by the CORESETPoolIndex associated with each TRP.

[0192] Referring again to FIG. 11 , in step S1120 , the terminal device determines the uplink synchronization information of the second TRP.

[0193] For the description of step S1120, please refer to the relevant description of step S810 above, which will not be repeated here.

[0194] FIG16 is a flow chart of a method for wireless communication provided by another embodiment of the present application. This flow chart describes how a network device determines uplink synchronization information of a second TRP based on the above information. The method shown in FIG16 is described from the perspective of interaction between a network device and a terminal device.

[0195] When the network device determines the uplink synchronization information of the second TRP based on the above information, the network device itself can determine the uplink synchronization information of the first TRP, as well as the transmission time difference between the first TRP and the second TRP, and the downlink arrival time difference can be indicated by the terminal device.

[0196] In step S1610, the terminal device sends second information to the network device, where the second information is used to indicate the downlink arrival time difference.

[0197] In some embodiments, if the first TRP and the second TRP are located in different cells, the second information is also used to indicate the cell corresponding to the second TRP. For example, the second information may include the PCI of the second TRP to indicate the cell corresponding to the second TRP.

[0198] In some embodiments, the second information may be carried in low-layer signaling, for example, in a MAC CE.

[0199] In some embodiments, the terminal device may separately send (or report) the second information to the network device, for example, by separately carrying the second information in a MAC CE for sending.

[0200] In some embodiments, the terminal device may combine the second information and other information in the same signaling and send it to the network device. For example, the terminal device may combine the second information into channel state information (CSI) reporting content (such as channel quality indication (CQI), rank indication (RI), precoding matrix indicator (PMI), etc.) and send them together to the network device.

[0201] In step S1620, the network device determines the uplink synchronization information of the second TRP.

[0202] For the description of step S1620, please refer to the relevant description of step S810 above, which will not be repeated here.

[0203] In some embodiments, the method may further include step S1630. In step S1630, the network device sends third information to the terminal device, where the third information is used to indicate uplink synchronization information of the second TRP.

[0204] After the network device determines the uplink synchronization information of the second TRP, it can inform the terminal device of the uplink synchronization information of the second TRP.

[0205] In some embodiments, the third information may be carried in low-layer signaling, such as MAC CE.

[0206] In the embodiment of the present application, both the terminal device and the network device can determine the uplink synchronization information of the second TRP by themselves, which increases the possibility of the terminal device autonomously correcting the uplink synchronization information of the TRP.

[0207] As mentioned above, the terminal device can determine the downlink arrival time difference based on the measurement of the reference signal, which is introduced below.

[0208] As an implementation method, the first TRP and the second TRP can respectively send downlink reference signals to the terminal device, and the terminal device measures the downlink reference signal from the first TRP and the downlink reference signal from the second TRP, and determines the downlink arrival time difference based on the measurement results.

[0209] The embodiment of the present application does not limit the type of downlink reference signal (e.g., the first downlink reference signal and / or the second downlink reference signal described below). For example, the downlink reference signal may be a synchronization signal block (SS / PBCH block, SSB) or a channel state information reference signal (CSI-RS).

[0210] Assume that the downlink time difference of arrival is determined based on measurements of a first downlink reference signal and a second downlink reference signal, and that the first downlink reference signal corresponds to a first TRP and the second downlink reference signal corresponds to a second TRP. It should be understood that the first downlink reference signal corresponding to the first TRP may mean that the first downlink reference signal is sent by the first TRP, and the second downlink reference signal corresponding to the second TRP may mean that the second downlink reference signal is sent by the second TRP.

[0211] When the terminal device determines the downlink arrival time difference based on the measurement of the downlink reference signal, the terminal device needs to know the correspondence between the downlink reference signal and the TRP, that is, the terminal device needs to know that the first downlink reference signal is sent by the first TRP and the second downlink reference signal is sent by the second TRP.

[0212] In some embodiments, the terminal device can determine the correspondence between the downlink reference signal and the TRP through the identification information of the TRP.

[0213] Taking the scenario of multiple TRPs between cells as an example, the PCIs corresponding to different TRPs may be different. The PCI of the TRP can be used as the identifier of the TRP to determine the correspondence between the downlink reference signal and the TRP.

[0214] Taking the scenario of multiple TRPs in a cell as an example, each TRP is associated with a group of CORESETs. The CORESET groups associated with different TRPs can be different. Therefore, the downlink reference signal can be associated with the CORESET group, and the correspondence between the downlink reference signal and the TRP can be indirectly determined by the association between the downlink reference signal and the CORESET group. In other words, both the TRP and the downlink reference signal can be associated with the CORESET group, so that the correspondence between the downlink reference signal and the TRP can be indirectly determined by using the association between the CORESET group and the downlink reference signal. For example, the first TRP and the first downlink reference signal can both be associated with the first group of CORESETs, and the second TRP and the second downlink reference signal can both be associated with the second group of CORESETs. In this case, the terminal device can distinguish which TRP sent the downlink reference signal by determining the CORESET group. In this implementation, the identification information of the TRP can refer to the identification information of the CORESET associated with the TRP, such as the RRC parameter "CORESETPoolIndex" of the CORESET.

[0215] In some embodiments, the network device may directly indicate to the terminal device the correspondence between the downlink reference signal and the TRP.

[0216] Taking the downlink reference signal as SSB as an example, for two TRPs, the network device will configure a certain number of SSBs for each TRP as the downlink reference signal. For example, SSBs with SSB identifiers of 0 to 31 (32 in total) can be sent from the first TRP, and SSBs with SSB identifiers of 32 to 63 (32 in total) can be sent from the second TRP. The network device can directly indicate the correspondence between SSBs and TRPs to the terminal device, for example, indicating the correspondence between SSB identifiers and TRPs to the terminal device, so that the terminal device can distinguish which TRP sent the downlink reference signal.

[0217] The case where the downlink reference signal is CSI-RS is similar to the case where the downlink reference signal is SSB, and will not be repeated here.

[0218] In some embodiments, after the terminal device determines the uplink synchronization information of the second TRP (including the terminal device calculating and determining it itself or the network device indicating it to the terminal device after determining it), the terminal device can reset the first timer, which is used to maintain the validity of the uplink synchronization information of the second TRP. The first timer may refer to the TA timer of the terminal device (expressed as TimeAlignmentTimer). Resetting the first timer by the terminal device can avoid unnecessary uplink desynchronization.

[0219] Example 2:

[0220] The second embodiment aims to utilize the process of activating TRP to provide services to the terminal device to determine the uplink synchronization information of the activated TRP, without initiating a random access process to the TRP to obtain the uplink synchronization information of the TRP.

[0221] In the scenario of multiple TRPs between cells, the terminal device first establishes uplink synchronization with the TRP of the serving cell. Uplink synchronization is not established for the TRP of the non-serving cell. In conjunction with Figure 17, the second embodiment is introduced by taking the case where the terminal device and the first TRP establish uplink synchronization (that is, the terminal device and the first TRP maintain uplink synchronization) and the second TRP do not establish uplink synchronization as an example, wherein the first TRP and the second TRP are located in different cells.

[0222] Figure 17 is a flow chart of a method for wireless communication provided by another embodiment of the present application. The method shown in Figure 17 includes steps S1710 and S1720, which are described in detail below.

[0223] In step S1710, the network device sends first information to the terminal device, where the first information is used to activate the second TRP.

[0224] In some embodiments, the first information is determined based on the terminal device's measurement of the downlink reference signal of the second TRP.

[0225] The downlink reference signal of the second TRP may include multiple types, for example, SSB or CSI-RS. Taking the downlink reference signal of the second TRP as CSI-RS as an example, the CSI-RS may be a CSI-RS used for beam management or a CSI-RS used for mobility management, which is not limited in this embodiment of the present application.

[0226] In some embodiments, the downlink reference signal may be pre-configured by the network device, for example, pre-configured by the network device through RRC signaling.

[0227] In some embodiments, the first information may be a unified transmission configuration indicator (TCI) status.

[0228] In some embodiments, the first information may be carried in a MAC CE, for example, the network device activates the unified TCI state via MAC CE signaling. In some embodiments, the first information may be carried in a DCI, for example, the network device configures the unified TCI state via MAC CE signaling and activates the unified TCI state via DCI signaling.

[0229] In some embodiments, the first information may include resources for sending a downlink reference signal, which corresponds to the second TRP. In other words, the downlink reference signal resources included in the first information may come from a TRP with a different PCI from the serving cell TRP (eg, the first TRP).

[0230] In step S1720, in response to the first information, the terminal device sends an uplink reference signal to the second TRP, where the uplink reference signal is used by the network device to determine uplink synchronization information of the second TRP.

[0231] In some embodiments, in addition to being used by the network device to determine the uplink synchronization information of the second TRP, the uplink reference signal can also be used by the network device to measure the channel of the terminal device relative to the second TRP, thereby estimating the uplink and downlink CSI between the terminal device and the second TRP.

[0232] The embodiment of the present application does not limit the type of the uplink reference signal. Exemplarily, the uplink reference signal may be an SRS, such as an aperiodic SRS.

[0233] In some embodiments, the transmit beam of the uplink reference signal corresponds to the receive beam of the downlink reference signal to ensure beam symmetry for uplink and downlink transmissions. In other words, the transmit beam of the uplink reference signal can be the beam used by the corresponding terminal device to receive the downlink reference signal. For example, if the uplink reference signal is an SRS and the downlink reference signal is an SSB / CSI-RS, the transmit beam of the SRS is the beam used by the corresponding terminal device to receive the downlink reference signal SSB / CSI-RS.

[0234] In some embodiments, the sending time of the uplink reference signal is determined based on the receiving time of the downlink reference signal. As an implementation method, the uplink reference signal is sent at the receiving time of the downlink reference signal, such as the receiving time of the first multipath of the downlink reference signal. In other words, the sending time of the uplink reference signal may not have a TA, so that the network device determines the uplink synchronization information of the second TRP by the arrival time of the uplink reference signal. As another implementation method, the receiving time of the downlink reference signal may be used as a reference time, and the sending time of the uplink reference signal may be determined based on the reference time, such as sending the uplink reference signal a certain time in advance of the receiving time of the downlink reference signal. In other words, the sending time of the uplink reference signal may be configured with a corresponding TA, and the terminal device uses the receiving time of the downlink reference signal as a reference point and sends the uplink reference signal in advance by the corresponding TA value.

[0235] The embodiments of the present application do not limit the method for obtaining the TA corresponding to the transmission time of the uplink reference signal. For example, the TA may use the value of the TA corresponding to the first TRP; or the network device may configure the TA corresponding to the transmission time of the uplink reference signal for the terminal device in advance, such as through RRC signaling.

[0236] In an embodiment of the present application, during the process of activating the second TRP to provide services to the terminal device, the terminal device can send an uplink reference signal to the second TRP, so that the network device can determine the uplink synchronization information of the second TRP based on the uplink reference signal. In this way, the uplink synchronization information of the second TRP can be determined by utilizing the existing inter-cell multi-TRP operation, reducing unnecessary random access processes for the terminal device, thereby reducing the system signaling overhead and the latency of the random access process.

[0237] In some embodiments, the process of activating the second TRP to provide services to the terminal device may refer to a beam management process between the terminal device and the second TRP. The following takes the beam management process between the terminal device and the second TRP as an example to exemplify the implementation steps of Example 2.

[0238] Referring to FIG. 18 , in step S1810 , the network device configures the downlink reference signal used for inter-cell multi-TRP transmission to the terminal device, such as SSB or CSI-RS.

[0239] In some embodiments, the network device may configure a downlink reference signal to the terminal device through RRC signaling.

[0240] In step S1820, the terminal device measures the downlink reference signal of the second TRP (which has a different PCI from the first TRP).

[0241] In step S1830, the terminal device performs beam reporting. The beam reporting content of the terminal device may include identification information of the downlink reference signal and / or the layer 1 reference signal receiving power (L1-RSRP) corresponding to the downlink reference signal.

[0242] In step S1840, the network device indicates a unified TCI state to the terminal device, wherein the downlink reference signal resources included in the unified TCI state are from the second TRP.

[0243] In some embodiments, the network device may activate the unified TCI state through MAC CE signaling, or may indicate the unified TCI state through MAC CE+DCI signaling.

[0244] In step S1850, the terminal device sends an uplink reference signal to the second TRP, for example, a non-periodic SRS.

[0245] In some embodiments, the transmission beam of the uplink reference signal corresponds to the beam used by the terminal device to receive the downlink reference signal.

[0246] In some embodiments, the uplink reference signal may be sent at a time without any advance, i.e., the terminal device sends the uplink reference signal at the time of receiving the reported downlink reference signal. In some embodiments, the uplink reference signal may be sent at a time using a TA value corresponding to the first TRP or a TA value configured in advance for the terminal device by the network device.

[0247] In step S1860, the network device determines the uplink synchronization information of the second TRP, that is, the network device determines the uplink synchronization information corresponding to the terminal device under the second TRP, for example, the TA corresponding to the terminal device under the second TRP.

[0248] In some embodiments, after the network device determines the uplink synchronization information of the second TRP, it can update the uplink synchronization information between the terminal device and the second TRP through MAC CE.

[0249] The method embodiment of the present application is described in detail above in conjunction with Figures 1 to 18 . The device embodiment of the present application is described in detail below in conjunction with Figures 19 to 23 . It should be understood that the description of the method embodiment corresponds to the description of the device embodiment. Therefore, for portions not described in detail, reference can be made to the above method embodiment.

[0250] FIG19 is a schematic diagram of the structure of a terminal device provided in an embodiment of the present application. The terminal device 1900 shown in FIG19 may include a determination module 1910.

[0251] The determination module 1910 can determine the uplink synchronization information of the second TRP when the terminal device maintains uplink synchronization with the first transmission receiving point TRP; wherein the uplink synchronization information of the second TRP is determined based on one or more of the following information: the uplink synchronization information of the first TRP; the downlink arrival time difference, the downlink arrival time difference is used to indicate the difference between the time when the signal of the first TRP arrives at the terminal device and the time when the signal of the second TRP arrives at the terminal device; and the transmission time difference between the first TRP and the second TRP.

[0252] Optionally, the uplink synchronization information of the second TRP is determined based on the uplink synchronization information of the first TRP, the downlink arrival time difference, and the transmission time difference.

[0253] Optionally, the uplink synchronization information of the first TRP is the one-way transmission delay from the first TRP to the terminal device, and the uplink synchronization information of the second TRP is the timing advance TA corresponding to the second TRP, and the TA corresponding to the second TRP is twice the target value, wherein the target value is equal to the sum of the difference between the one-way transmission delay and the transmission time difference and the downlink arrival time difference.

[0254] Optionally, the terminal device 1900 further includes a receiving module 1920. The receiving module 1920 may be configured to receive first information from a network device, where the first information is used to indicate the transmission time difference.

[0255] Optionally, the first information is carried in radio resource control RRC signaling or media access control element MAC CE.

[0256] Optionally, the first information includes: the downlink sending time of the first TRP and the downlink sending time of the second TRP; and / or the difference between the downlink sending time of the first TRP and the downlink sending time of the second TRP.

[0257] Optionally, the terminal device 1900 further includes a sending module for sending second information to the network device, where the second information is used to indicate the downlink arrival time difference.

[0258] Optionally, if the first TRP and the second TRP belong to different cells, the second information is also used to indicate the cell corresponding to the second TRP.

[0259] Optionally, the downlink arrival time difference is determined based on measurements of a first downlink reference signal and a second downlink reference signal, wherein the first downlink reference signal corresponds to the first TRP and the second downlink reference signal corresponds to the second TRP.

[0260] Optionally, the first TRP and the first downlink reference signal are both associated with a first control resource set CORESET; and the second TRP and the second downlink reference signal are both associated with a second group CORESET.

[0261] Optionally, the first downlink reference signal and the second downlink reference signal are one of the following reference signals: a synchronization signal block SSB, a channel state information reference signal CSI-RS.

[0262] Optionally, the terminal device 1900 further includes a reset module for resetting a first timer, wherein the first timer is used to maintain the validity of the uplink synchronization information of the second TRP.

[0263] Optionally, the uplink synchronization information includes one or more of the following information: TA, and one-way transmission delay.

[0264] FIG20 is a schematic diagram of the structure of a terminal device provided in another embodiment of the present application. The terminal device 2000 shown in FIG20 may include a receiving module 2010 and a sending module 2020.

[0265] The receiving module 2010 can be used to receive first information when the terminal device maintains uplink synchronization with the first transmission receiving point TRP, and the first information is used to activate a second TRP located in a different cell from the first TRP.

[0266] The sending module 2020 can be used to send an uplink reference signal to the second TRP in response to the first information, and the uplink reference signal is used by the network device to determine the uplink synchronization information of the second TRP.

[0267] Optionally, the first information is determined based on the measurement of the downlink reference signal of the second TRP by the terminal device, and the transmit beam of the uplink reference signal corresponds to the receive beam of the downlink reference signal.

[0268] Optionally, the sending time of the uplink reference signal is determined based on the receiving time of the downlink reference signal.

[0269] Optionally, the first information is a unified transmission configuration indication TCI state.

[0270] Optionally, the uplink synchronization information includes one or more of the following information: timing advance TA, and one-way transmission delay.

[0271] Optionally, the uplink reference signal is a non-periodic channel sounding reference signal SRS.

[0272] FIG21 is a schematic diagram of the structure of a network device according to an embodiment of the present application. The network device 2100 shown in FIG21 may include a determination module 2110.

[0273] The determination module 2110 can be used to determine the uplink synchronization information of the second TRP when the terminal device maintains uplink synchronization with the first transmission receiving point TRP; wherein the uplink synchronization information of the second TRP is determined based on one or more of the following information: the uplink synchronization information of the first TRP; the downlink arrival time difference, the downlink arrival time difference is used to indicate the difference between the time when the signal of the first TRP arrives at the terminal device and the time when the signal of the second TRP arrives at the terminal device; and the transmission time difference between the first TRP and the second TRP.

[0274] Optionally, the uplink synchronization information of the second TRP is determined based on the uplink synchronization information of the first TRP, the downlink arrival time difference, and the transmission time difference.

[0275] Optionally, the uplink synchronization information of the first TRP is the one-way transmission delay from the first TRP to the terminal device, and the uplink synchronization information of the second TRP is the timing advance TA corresponding to the second TRP, and the TA corresponding to the second TRP is twice the target value, wherein the target value is equal to the sum of the difference between the one-way transmission delay and the transmission time difference and the downlink arrival time difference.

[0276] Optionally, the network device 2100 further includes a sending module 2120. The sending module 2120 may be configured to send first information to the terminal device, where the first information is used to indicate the transmission time difference.

[0277] Optionally, the first information is carried in radio resource control RRC signaling or media access control element MAC CE.

[0278] Optionally, the first information includes: the downlink sending time of the first TRP and the downlink sending time of the second TRP; and / or the difference between the downlink sending time of the first TRP and the downlink sending time of the second TRP.

[0279] Optionally, the network device 2120 further includes: a receiving module, configured to receive second information sent by the terminal device, wherein the second information is used to indicate the downlink arrival time difference.

[0280] Optionally, if the first TRP and the second TRP belong to different cells, the second information is also used to indicate the cell corresponding to the second TRP.

[0281] Optionally, the downlink arrival time difference is determined based on measurements of a first downlink reference signal and a second downlink reference signal, wherein the first downlink reference signal corresponds to the first TRP and the second downlink reference signal corresponds to the second TRP.

[0282] Optionally, the first TRP and the first downlink reference signal are both associated with a first control resource set CORESET; and the second TRP and the second downlink reference signal are both associated with a second group CORESET.

[0283] Optionally, the first downlink reference signal and the second downlink reference signal are one of the following reference signals: a synchronization signal block SSB, a channel state information reference signal CSI-RS.

[0284] Optionally, the uplink synchronization information includes one or more of the following information: TA, and one-way transmission delay.

[0285] FIG22 is a schematic diagram of the structure of a network device according to another embodiment of the present application. The network device 2200 shown in FIG22 may include a sending module 2210 and a determining module 2220.

[0286] The sending module 2210 can be used to send first information to the terminal device when the terminal device maintains uplink synchronization with the first transmission receiving point TRP, and the first information is used to activate a second TRP located in a different cell from the first TRP.

[0287] The determination module 2220 can be used to determine the uplink synchronization information of the second TRP, and the uplink synchronization information is determined based on the uplink reference signal sent by the terminal device to the second TRP.

[0288] Optionally, the first information is determined based on the measurement of the downlink reference signal of the second TRP by the terminal device, and the transmit beam of the uplink reference signal corresponds to the receive beam of the downlink reference signal.

[0289] Optionally, the sending time of the uplink reference signal is determined based on the receiving time of the downlink reference signal.

[0290] Optionally, the first information is a unified transmission configuration indication TCI state.

[0291] Optionally, the uplink synchronization information includes one or more of the following information: timing advance TA, and one-way transmission delay.

[0292] Optionally, the uplink reference signal is a non-periodic channel sounding reference signal SRS.

[0293] Figure 23 is a schematic block diagram of a communication device according to an embodiment of the present application. The dashed lines in Figure 23 indicate that the unit or module is optional. Device 2300 may be used to implement the method described in the above method embodiment. Device 2300 may be a chip, a terminal device, or a network device.

[0294] The device 2300 may include one or more processors 2310. The processor 2310 may support the device 2300 to implement the method described in the above method embodiment. The processor 2310 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 another general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0295] The apparatus 2300 may further include one or more memories 2320. The memories 1820 store programs that can be executed by the processor 2310, causing the processor 2310 to perform the methods described in the above method embodiments. The memories 2320 may be independent of the processor 2310 or integrated into the processor 2310.

[0296] The apparatus 2300 may further include a transceiver 2330. The processor 2310 may communicate with other devices or chips via the transceiver 2330. For example, the processor 2310 may transmit and receive data with other devices or chips via the transceiver 2330.

[0297] The present application also provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to a terminal or network device provided in the present application, and the program enables a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0298] The present 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 the present application, and the program causes a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0299] The embodiments of the present application also provide a computer program. The computer program can be applied to the terminal or network device provided in the embodiments of the present application, and the computer program enables a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0300] It should be understood that the terms "system" and "network" in this application can be used interchangeably. In addition, the terms used in this application are only used to explain the specific embodiments of this application and are not intended to limit this application. The terms "first", "second", "third", and "fourth" in the specification and claims of this application and the accompanying drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0301] In the embodiments of this application, the term "indication" may refer to a direct indication, an indirect indication, or an indication of an association. For example, "A indicates B" may refer to a direct indication of B, e.g., B can obtain information through A; it may refer to an indirect indication of B, e.g., A indicates C, e.g., B can obtain information through C; or it may refer to an association between A and B.

[0302] In the embodiment of the present application, "B corresponding to A" means that B is associated with A and B can be determined based on A. However, it should be understood that determining B based on A does not mean determining B based solely on A, but B can also be determined based on A and / or other information.

[0303] In the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship between indication and indication, configuration and configuration, etc.

[0304] In the embodiments of the present application, "pre-definition" or "pre-configuration" may be implemented by pre-storing corresponding codes, tables, or other methods that can be used to indicate relevant information in a device (e.g., a terminal device and a network device). The present application does not limit the specific implementation method. For example, pre-definition may refer to information defined in a protocol.

[0305] In the embodiments of the present application, the “protocol” may refer to a standard protocol in the communications field, for example, it may include an LTE protocol, an NR protocol, and related protocols used in future communication systems, and the present application does not limit this.

[0306] In the embodiments of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0307] In various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean 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 the present application.

[0308] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0309] The units described as separate components may or may not be physically separate, and 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 these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0310] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0311] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part 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, the process or function described in the embodiment of the present application is generated in whole or in part. 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 computer-readable storage medium. 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 a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be read by a computer or a data storage device such as a server or data center that includes one or more available media integrated therein. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital versatile disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0312] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A method for wireless communication, characterized in that include: In the case where the terminal device maintains uplink synchronization with the first transmission reception point TRP, the terminal device determines uplink synchronization information of the second TRP; The uplink synchronization information of the second TRP is determined based on one or more of the following information: Uplink synchronization information of the first TRP; Downlink arrival time difference, where the downlink arrival time difference indicates the difference between the time when the signal of the first TRP arrives at the terminal device and the time when the signal of the second TRP arrives at the terminal device; as well as The transmission time difference between the first TRP and the second TRP.

2. The method according to claim 1, characterized in that The uplink synchronization information of the second TRP is determined based on the uplink synchronization information of the first TRP, the downlink arrival time difference, and the transmission time difference.

3. The method according to claim 2, characterized in that The uplink synchronization information of the first TRP is the one-way transmission delay from the first TRP to the terminal device, and the uplink synchronization information of the second TRP is the timing advance TA corresponding to the second TRP. The TA corresponding to the second TRP is twice the target value, wherein the target value is equal to the sum of the difference between the one-way transmission delay and the transmission time difference and the downlink arrival time difference.

4. The method according to any one of claims 1 to 3, characterized in that Before the terminal device determines the uplink synchronization information of the second TRP, the method further includes: The terminal device receives first information from a network device, where the first information is used to indicate the transmission time difference.

5. The method according to claim 4, characterized in that The first information is carried in radio resource control RRC signaling or media access control element MAC CE.

6. The method according to claim 4 or 5, characterized in that The first information includes: The downlink transmission time of the first TRP and the downlink transmission time of the second TRP; and / or The difference between the downlink sending time of the first TRP and the downlink sending time of the second TRP.

7. The method according to any one of claims 1 to 3, characterized in that Before the terminal device determines the uplink synchronization information of the second TRP, the method further includes: The terminal device sends second information to the network device, where the second information is used to indicate the downlink arrival time difference.

8. The method according to claim 7, characterized in that If the first TRP and the second TRP belong to different cells, the second information is also used to indicate the cell corresponding to the second TRP.

9. The method according to any one of claims 1 to 8, characterized in that The downlink arrival time difference is determined based on measurements of a first downlink reference signal and a second downlink reference signal, wherein the first downlink reference signal corresponds to the first TRP and the second downlink reference signal corresponds to the second TRP.

10. The method according to claim 9, characterized in that The first TRP and the first downlink reference signal are both associated with a first control resource set CORESET; and the second TRP and the second downlink reference signal are both associated with a second control resource set CORESET.

11. The method according to claim 9 or 10, characterized in that The first downlink reference signal and the second downlink reference signal are one of the following reference signals: a synchronization signal block SSB, a channel state information reference signal CSI-RS.

12. The method according to any one of claims 1 to 11, characterized in that After the terminal device determines the uplink synchronization information of the second TRP, the method further includes: The terminal device resets a first timer, which is used to maintain the validity of the uplink synchronization information of the second TRP.

13. The method according to any one of claims 1 to 12, characterized in that The uplink synchronization information includes one or more of the following information: TA, and one-way transmission delay.

14. A method for wireless communication, characterized in that: include: When the terminal device maintains uplink synchronization with a first transmission reception point TRP, the terminal device receives first information for activating a second TRP located in a different cell from the first TRP; In response to the first information, the terminal device sends an uplink reference signal to the second TRP, and the uplink reference signal is used by the network device to determine the uplink synchronization information of the second TRP.

15. The method according to claim 14, characterized in that The first information is determined based on the measurement of the downlink reference signal of the second TRP by the terminal device, and the transmit beam of the uplink reference signal corresponds to the receive beam of the downlink reference signal.

16. The method according to claim 15, characterized in that The sending time of the uplink reference signal is determined based on the receiving time of the downlink reference signal.

17. The method according to any one of claims 14 to 16, characterized in that The first information is a unified transmission configuration indication TCI state.

18. The method according to any one of claims 14 to 17, characterized in that The uplink synchronization information includes one or more of the following information: timing advance TA, and one-way transmission delay.

19. The method according to any one of claims 14 to 18, characterized in that The uplink reference signal is an aperiodic channel sounding reference signal SRS.

20. A method for wireless communication, characterized in that: include: In the case where the terminal device maintains uplink synchronization with the first transmission reception point TRP, the network device determines uplink synchronization information of the second TRP; The uplink synchronization information of the second TRP is determined based on one or more of the following information: Uplink synchronization information of the first TRP; Downlink arrival time difference, where the downlink arrival time difference indicates the difference between the time when the signal of the first TRP arrives at the terminal device and the time when the signal of the second TRP arrives at the terminal device; as well as The transmission time difference between the first TRP and the second TRP.

21. The method according to claim 20, characterized in that The uplink synchronization information of the second TRP is determined based on the uplink synchronization information of the first TRP, the downlink arrival time difference, and the transmission time difference.

22. The method according to claim 21, characterized in that The uplink synchronization information of the first TRP is the one-way transmission delay from the first TRP to the terminal device, and the uplink synchronization information of the second TRP is the timing advance TA corresponding to the second TRP. The TA corresponding to the second TRP is twice the target value, wherein the target value is equal to the sum of the difference between the one-way transmission delay and the transmission time difference and the downlink arrival time difference.

23. The method according to any one of claims 20 to 22, characterized in that Before the network device determines the uplink synchronization information of the second TRP, the method further includes: The network device sends first information to the terminal device, where the first information is used to indicate the transmission time difference.

24. The method according to claim 23, wherein The first information is carried in radio resource control RRC signaling or media access control element MAC CE.

25. The method according to claim 23 or 24, characterized in that The first information includes: The downlink transmission time of the first TRP and the downlink transmission time of the second TRP; and / or The difference between the downlink sending time of the first TRP and the downlink sending time of the second TRP.

26. The method according to any one of claims 20 to 22, characterized in that Before the network device determines the uplink synchronization information of the second TRP, the method further includes: The network device receives second information sent by the terminal device, where the second information is used to indicate the downlink arrival time difference.

27. The method according to claim 26, characterized in that If the first TRP and the second TRP belong to different cells, the second information is also used to indicate the cell corresponding to the second TRP.

28. The method according to any one of claims 20 to 27, characterized in that The downlink arrival time difference is determined based on measurements of a first downlink reference signal and a second downlink reference signal, wherein the first downlink reference signal corresponds to the first TRP and the second downlink reference signal corresponds to the second TRP.

29. The method according to claim 28, characterized in that The first TRP and the first downlink reference signal are both associated with a first control resource set CORESET; and the second TRP and the second downlink reference signal are both associated with a second control resource set CORESET.

30. The method according to claim 28 or 29, characterized in that The first downlink reference signal and the second downlink reference signal are one of the following reference signals: a synchronization signal block SSB, a channel state information reference signal CSI-RS.

31. The method according to any one of claims 20 to 30, characterized in that The uplink synchronization information includes one or more of the following information: TA, and one-way transmission delay.

32. A method for wireless communication, characterized in that: include: When the terminal device maintains uplink synchronization with the first transmission reception point TRP, the network device sends first information to the terminal device, where the first information is used to activate a second TRP located in a different cell from the first TRP; The network device determines the uplink synchronization information of the second TRP, and the uplink synchronization information is determined based on the uplink reference signal sent by the terminal device to the second TRP.

33. The method according to claim 32, characterized in that The first information is determined based on the measurement of the downlink reference signal of the second TRP by the terminal device, and the transmit beam of the uplink reference signal corresponds to the receive beam of the downlink reference signal.

34. The method according to claim 33, wherein The sending time of the uplink reference signal is determined based on the receiving time of the downlink reference signal.

35. The method according to any one of claims 32 to 34, characterized in that The first information is a unified transmission configuration indication TCI state.

36. The method according to any one of claims 32 to 35, characterized in that The uplink synchronization information includes one or more of the following information: timing advance TA, and one-way transmission delay.

37. The method according to any one of claims 32 to 36, wherein: The uplink reference signal is an aperiodic channel sounding reference signal SRS.

38. A terminal device, characterized in that: include: a determination module, configured to determine uplink synchronization information of a second transmission reception point TRP when the terminal device maintains uplink synchronization with the first transmission reception point TRP; The uplink synchronization information of the second TRP is determined based on one or more of the following information: Uplink synchronization information of the first TRP; Downlink arrival time difference, where the downlink arrival time difference indicates the difference between the time when the signal of the first TRP arrives at the terminal device and the time when the signal of the second TRP arrives at the terminal device; as well as The transmission time difference between the first TRP and the second TRP.

39. The terminal device according to claim 38, characterized in that The uplink synchronization information of the second TRP is determined based on the uplink synchronization information of the first TRP, the downlink arrival time difference, and the transmission time difference.

40. The terminal device according to claim 39, characterized in that The uplink synchronization information of the first TRP is the one-way transmission delay from the first TRP to the terminal device, and the uplink synchronization information of the second TRP is the timing advance TA corresponding to the second TRP. The TA corresponding to the second TRP is twice the target value, wherein the target value is equal to the sum of the difference between the one-way transmission delay and the transmission time difference and the downlink arrival time difference.

41. The terminal device according to any one of claims 38 to 40, characterized in that: The terminal device further includes: The receiving module is configured to receive first information from a network device, where the first information is used to indicate the transmission time difference.

42. The terminal device according to claim 41, characterized in that The first information is carried in radio resource control RRC signaling or media access control element MAC CE.

43. The terminal device according to claim 41 or 42, characterized in that: The first information includes: The downlink transmission time of the first TRP and the downlink transmission time of the second TRP; and / or The difference between the downlink sending time of the first TRP and the downlink sending time of the second TRP.

44. The terminal device according to any one of claims 38 to 40, characterized in that: The terminal device further includes: The sending module is used to send second information to the network device, where the second information is used to indicate the downlink arrival time difference.

45. The terminal device according to claim 44, characterized in that If the first TRP and the second TRP belong to different cells, the second information is also used to indicate the cell corresponding to the second TRP.

46. ​​The terminal device according to any one of claims 38 to 45, characterized in that: The downlink arrival time difference is determined based on measurements of a first downlink reference signal and a second downlink reference signal, wherein the first downlink reference signal corresponds to the first TRP and the second downlink reference signal corresponds to the second TRP.

47. The terminal device according to claim 46, characterized in that The first TRP and the first downlink reference signal are both associated with a first control resource set CORESET; and the second TRP and the second downlink reference signal are both associated with a second control resource set CORESET.

48. The terminal device according to claim 46 or 47, characterized in that The first downlink reference signal and the second downlink reference signal are one of the following reference signals: a synchronization signal block SSB, a channel state information reference signal CSI-RS.

49. The terminal device according to any one of claims 38 to 48, characterized in that: The terminal device further includes: A reset module is used to reset a first timer, and the first timer is used to maintain the validity of the uplink synchronization information of the second TRP.

50. The terminal device according to any one of claims 38 to 49, characterized in that: The uplink synchronization information includes one or more of the following information: TA, and one-way transmission delay.

51. A terminal device, characterized in that: include: A receiving module, configured to receive first information when the terminal device maintains uplink synchronization with the first transmission reception point TRP, wherein the first information is used to activate a second TRP located in a different cell from the first TRP; A sending module is used to send an uplink reference signal to the second TRP in response to the first information, and the uplink reference signal is used by the network device to determine the uplink synchronization information of the second TRP.

52. The terminal device according to claim 51, characterized in that The first information is determined based on the measurement of the downlink reference signal of the second TRP by the terminal device, and the transmit beam of the uplink reference signal corresponds to the receive beam of the downlink reference signal.

53. The terminal device according to claim 52, characterized in that The sending time of the uplink reference signal is determined based on the receiving time of the downlink reference signal.

54. The terminal device according to any one of claims 51 to 53, characterized in that: The first information is a unified transmission configuration indication TCI state.

55. The terminal device according to any one of claims 51 to 54, characterized in that: The uplink synchronization information includes one or more of the following information: timing advance TA, and one-way transmission delay.

56. The terminal device according to any one of claims 51 to 55, characterized in that: The uplink reference signal is an aperiodic channel sounding reference signal SRS.

57. A network device, characterized in that include: A determination module, configured to determine uplink synchronization information of a second TRP when the terminal device maintains uplink synchronization with the first transmission reception point TRP; The uplink synchronization information of the second TRP is determined based on one or more of the following information: Uplink synchronization information of the first TRP; Downlink arrival time difference, where the downlink arrival time difference indicates the difference between the time when the signal of the first TRP arrives at the terminal device and the time when the signal of the second TRP arrives at the terminal device; as well as The transmission time difference between the first TRP and the second TRP.

58. The network device according to claim 57, characterized in that The uplink synchronization information of the second TRP is determined based on the uplink synchronization information of the first TRP, the downlink arrival time difference, and the transmission time difference.

59. The network device according to claim 58, wherein: The uplink synchronization information of the first TRP is the one-way transmission delay from the first TRP to the terminal device, and the uplink synchronization information of the second TRP is the timing advance TA corresponding to the second TRP. The TA corresponding to the second TRP is twice the target value, wherein the target value is equal to the sum of the difference between the one-way transmission delay and the transmission time difference and the downlink arrival time difference.

60. The network device according to any one of claims 57 to 59, characterized in that: The network device further includes: A sending module is used to send first information to the terminal device, where the first information is used to indicate the transmission time difference.

61. The network device according to claim 60, wherein: The first information is carried in radio resource control RRC signaling or media access control element MAC CE.

62. The network device according to claim 60 or 61, characterized in that The first information includes: The downlink transmission time of the first TRP and the downlink transmission time of the second TRP; and / or The difference between the downlink sending time of the first TRP and the downlink sending time of the second TRP.

63. The network device according to any one of claims 57 to 59, characterized in that: The network device further includes: A receiving module is used to receive the second information sent by the terminal device, where the second information is used to indicate the downlink arrival time difference.

64. The network device according to claim 63, wherein: If the first TRP and the second TRP belong to different cells, the second information is also used to indicate the cell corresponding to the second TRP.

65. The network device according to any one of claims 57 to 64, characterized in that: The downlink arrival time difference is determined based on measurements of a first downlink reference signal and a second downlink reference signal, wherein the first downlink reference signal corresponds to the first TRP and the second downlink reference signal corresponds to the second TRP.

66. The network device according to claim 65, characterized in that The first TRP and the first downlink reference signal are both associated with a first control resource set CORESET; and the second TRP and the second downlink reference signal are both associated with a second control resource set CORESET.

67. The network device according to claim 65 or 66, characterized in that The first downlink reference signal and the second downlink reference signal are one of the following reference signals: a synchronization signal block SSB, a channel state information reference signal CSI-RS.

68. The network device according to any one of claims 57 to 67, characterized in that: The uplink synchronization information includes one or more of the following information: TA, and one-way transmission delay.

69. A network device, characterized in that include: A sending module, configured to send first information to the terminal device when the terminal device maintains uplink synchronization with the first transmission reception point TRP, wherein the first information is used to activate a second TRP located in a different cell from the first TRP; A determination module is used to determine the uplink synchronization information of the second TRP, and the uplink synchronization information is determined based on the uplink reference signal sent by the terminal device to the second TRP.

70. The network device according to claim 69, wherein: The first information is determined based on the measurement of the downlink reference signal of the second TRP by the terminal device, and the transmit beam of the uplink reference signal corresponds to the receive beam of the downlink reference signal.

71. The network device according to claim 70, characterized in that The sending time of the uplink reference signal is determined based on the receiving time of the downlink reference signal.

72. The network device according to any one of claims 69 to 71, characterized in that: The first information is a unified transmission configuration indication TCI state.

73. The network device according to any one of claims 69 to 72, characterized in that: The uplink synchronization information includes one or more of the following information: timing advance TA, and one-way transmission delay.

74. The network device according to any one of claims 69 to 73, characterized in that: The uplink reference signal is an aperiodic channel sounding reference signal SRS.

75. A terminal device, characterized in that: The terminal device comprises a memory and a processor, wherein the memory is used to store a program, and the processor is used to call the program in the memory so that the terminal device executes the method according to any one of claims 1 to 19.

76. A network device, characterized in that The network device comprises a memory and a processor, wherein the memory is used to store a program, and the processor is used to call the program in the memory so as to enable the network device to execute the method according to any one of claims 20 to 37.

77. A device, characterized in that The device comprises a processor configured to call a program from a memory so as to cause the device to execute the method according to any one of claims 1 to 37.

78. A chip, characterized in that The device comprises a processor configured to call a program from a memory so that a device equipped with the chip executes the method according to any one of claims 1 to 37.

79. A computer-readable storage medium, characterized in that A program is stored thereon, the program causing a computer to execute the method according to any one of claims 1 to 37.

80. A computer program product, characterized in that The method comprises a program for causing a computer to execute the method according to any one of claims 1 to 37.

81. A computer program, characterized in that The computer program causes a computer to execute the method according to any one of claims 1 to 37.

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