Wireless communication method and communication device

Abstract

Provided in the present application are a wireless communication method and a communication device. The method comprises: a terminal device receiving first information sent by a first transmit point; and the terminal device determining, on the basis of the first information, a first downlink reference timing corresponding to a first timing advance (TA), wherein the first TA corresponds to the first transmit point, the first transmit point is one of a plurality of transmit points in communication with the terminal device, and the first information is used for indicating a method for determining the first downlink reference timing.

Description

Wireless communication method and communication device Technical Field

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

[0002] In a multi-transmit / receive point (TRP) transmission scenario, a terminal device can communicate with multiple transmission points and perform uplink synchronization based on the timing advance (TA) corresponding to each transmission point. The clocks of different transmission points may be asynchronous, or in other words, the downlink reference timing corresponding to different transmission points may be different. During uplink synchronization, the terminal device must first synchronize downlink to the downlink reference timing corresponding to the TA before performing uplink synchronization based on the TA. However, there is currently no suitable solution for how the terminal device determines the downlink reference timing corresponding to the TA.

[0003] Summary of the Invention

[0004] The present application provides a wireless communication method and a communication device. Several aspects of the embodiments of the present application are introduced below.

[0005] In a first aspect, a wireless communication method is provided, including: a terminal device receiving first information sent by a first transmission point; and determining, by the terminal device, a first downlink reference timing corresponding to a first timing advance (TA) based on the first information; wherein the first TA corresponds to the first transmission point, which is one of multiple transmission points communicating with the terminal device, and the first information indicates a method for determining the first downlink reference timing.

[0006] According to a second aspect, a wireless communication method is provided, including: a first transmission point sending first information to a terminal device; the first information being used to enable the terminal device to determine, based on the first information, a first downlink reference timing corresponding to a first timing advance (TA); wherein the first TA corresponds to the first transmission point, which is one of multiple transmission points communicating with the terminal device; and the first information indicating a method for determining the first downlink reference timing.

[0007] According to a third aspect, a terminal device is provided, including: a receiving unit configured to receive first information sent by a first transmission point; and a first determining unit configured to determine, based on the first information, a first downlink reference timing corresponding to a first timing advance (TA). The first TA corresponds to the first transmission point, which is one of multiple transmission points communicating with the terminal device, and the first information indicates a method for determining the first downlink reference timing.

[0008] According to a fourth aspect, a communication device is provided, wherein the communication device is a first transmission point and includes: a sending unit, configured to send first information to a terminal device; the first information is used to enable the terminal device to determine, based on the first information, a first downlink reference timing corresponding to a first timing advance (TA); wherein the first TA corresponds to the first transmission point, the first transmission point being one of multiple transmission points communicating with the terminal device, and the first information is used to indicate a method for determining the first downlink reference timing.

[0009] In a fifth aspect, a terminal device is provided, comprising a memory, a processor and a transceiver, 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 the method described in the first aspect.

[0010] In the sixth aspect, a communication device is provided, which is a first transmission point and includes a memory, a processor and a transceiver, 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 the method described in the second aspect.

[0011] In a seventh aspect, a device is provided, comprising a processor for calling a program from a memory to execute the method as described in the first aspect or the second aspect.

[0012] In an eighth aspect, a chip is provided, comprising a processor for calling a program from a memory so that a device equipped with the chip executes the method described in the first aspect or the second aspect.

[0013] In a ninth aspect, a computer-readable storage medium is provided, on which a program is stored, wherein the program enables a computer to execute the method as described in the first aspect or the second aspect.

[0014] In a tenth aspect, a computer program product is provided, comprising a program, wherein the program enables a computer to execute the method as described in the first aspect or the second aspect.

[0015] In an eleventh aspect, a computer program is provided, wherein the computer program enables a computer to execute the method as described in the first aspect or the second aspect.

[0016] In an embodiment of the present application, a first transmission point sends first information to a terminal device, so that the terminal device can determine a first downlink reference timing corresponding to a first TA based on a determination method indicated by the first information, thereby performing uplink synchronization based on the first TA and the first downlink reference timing, providing a clear solution for the terminal device to determine the downlink reference timing corresponding to the TA. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG1 is a wireless communication system 100 used in an embodiment of the present application.

[0018] FIG2A is an example diagram of uplink transmission delay when the TA mechanism does not exist.

[0019] FIG2B is an example diagram of uplink transmission delay in the presence of the TA mechanism.

[0020] FIG3 is a schematic diagram of a multi-TRP communication scenario.

[0021] FIG4 is a schematic flowchart of a wireless communication method provided in an embodiment of the present application.

[0022] FIG5 is a schematic diagram of a method for measuring the location of a terminal device provided in an embodiment of the present application.

[0023] FIG6 is a schematic diagram of two possible locations of a terminal device measured by two TRPs.

[0024] FIG7 is a schematic diagram of measuring the position of a terminal device through three TRPs.

[0025] FIG8 is a schematic block diagram of a terminal device provided in an embodiment of the present application.

[0026] FIG9 is a schematic block diagram of a communication device provided in an embodiment of the present application.

[0027] FIG10 is a schematic structural diagram of a communication device according to an embodiment of the present application. DETAILED DESCRIPTION

[0028] The technical solution in this application will be described below with reference to the accompanying drawings.

[0029] Communication system architecture

[0030] Figure 1 illustrates a wireless communication system 100 used in an embodiment of the present application. The wireless communication system 100 may include a network device 110 and a terminal device 120. The network device 110 may be a device that communicates with the terminal device 120. The network device 110 may provide communication coverage for a specific geographic area and may communicate with the terminal device 120 within the coverage area.

[0031] FIG1 exemplarily shows a network device and two terminal devices. Optionally, the wireless communication system 100 may include multiple network devices and each network device may include another number of terminal devices within its coverage area, which is not limited in this embodiment of the present application.

[0032] Optionally, the wireless communication system 100 may further include other network entities such as a network controller and a mobility management entity, which is not limited in the embodiment of the present application.

[0033] It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: fifth generation (5G) system or new radio (NR), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), etc. The technical solutions provided in this application can also be applied to future communication systems, such as the sixth generation mobile communication system, satellite communication system, etc.

[0034] The terminal device in the embodiments of the present application 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. The terminal device in the embodiments of the present application may refer to 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 function, a vehicle-mounted device, etc. The terminal device in the embodiments of the present application can 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 UE can be used to act as a base station. For example, the UE can act as a scheduling entity that provides sidelink signals between UEs in V2X or D2D, etc. For example, a cellular phone and a car communicate with each other using sidelink signals. The cellular phone and smart home devices communicate without relaying the communication signal through the base station.

[0035] 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 can 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, transmission point (TRP), transmission 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 can be a macro base station, a micro base station, a relay node, a donor node or the like, or a combination thereof. A base station can also refer to a communication module, modem or chip used to be set in the aforementioned device or apparatus. The base station can also be a mobile switching center and a device that performs base station functions in device-to-device D2D, vehicle-to-everything (V2X), and machine-to-machine (M2M) communications, a network-side device in a 6G network, or a device that performs base station functions in future communication systems. The base station can support networks with the same or different access technologies. The embodiments of this application do not limit the specific technology and specific device form used by the network equipment.

[0036] 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.

[0037] 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.

[0038] The network equipment and terminal devices can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on the water; they can also be deployed in the air on aircraft, balloons, or satellites. The embodiments of this application do not limit the scenarios in which the network equipment and terminal devices are located.

[0039] It should be understood that all or part of the functions of the communication device in this application can also be implemented through software functions running on hardware, or through virtualization functions instantiated on a platform (such as a cloud platform).

[0040] Timing Advance (TA)

[0041] Wireless communication systems (e.g., LTE / NR systems) can use orthogonal frequency division multiplexing (OFDM) transmission schemes. This is because wireless communication systems can only have good demodulation performance if the subcarriers maintain orthogonality. However, due to the existence of transmission delay, the downlink signal needs to be delayed before it can be received by the terminal device. Due to the different positions of different terminal devices relative to the network equipment, the time when the uplink signals sent by different terminal devices arrive at the network equipment will also be inconsistent, which will seriously affect the orthogonality between the subcarriers and reduce the demodulation performance of the OFDM transmission scheme.

[0042] Taking uplink transmission as an example, a key feature of uplink transmission is orthogonal multiple access (M2A) between different devices in time and frequency. This means that uplink transmissions from different devices in the same cell do not interfere with each other. Uplink transmissions are typically multi-device transmissions, so network equipment may receive signals from multiple devices simultaneously.

[0043] In order to ensure the orthogonality of uplink transmission and avoid intra-cell interference, the network equipment requires that the time when signals from different terminal devices at the same time but different frequency domain resources arrive at the network equipment is basically aligned. The reason why the network equipment requires that the time when signals from different terminal devices at the same time arrive at the network equipment is basically aligned is because as long as the network equipment receives the uplink data sent by the terminal device within the cyclic prefix range, it can correctly decode the uplink data. In addition, in order to maintain the orthogonality between uplink reference signals using different cyclic shifts, the network equipment also requires that the received uplink reference signals must be time-aligned. Therefore, in order to achieve uplink synchronization, or in other words, to ensure time synchronization on the network equipment side, the wireless communication system (for example, LTE / NR system) can support the uplink TA mechanism.

[0044] TA can be understood as a command sent by a network device to a terminal device to adjust the uplink transmission of the terminal device. The embodiment of the present application does not limit the uplink transmission of the terminal device. For example, the uplink transmission may include one or more of the following: physical uplink shared channel (PUSCH), physical uplink control channel (PUCCH), sounding reference signal (SRS), etc.

[0045] In a communication system that supports uplink TA, the uplink and downlink clocks on the network device are identical, while there is an offset between the uplink and downlink clocks on the terminal device. Different terminal devices have different uplink TA values. From the terminal device's perspective, the TA value is essentially the offset between the start time of the downlink frame received by the terminal device and the time it transmits the uplink frame. By appropriately controlling the offset for each terminal device, the network device can ensure that uplink signals from different terminal devices arrive at the network device at nearly the same time. Terminal devices farther from the network device experience greater transmission latency and therefore need to send uplink data earlier than terminal devices closer to the network device.

[0046] Figures 2A and 2B respectively show the time delay of the uplink signal reaching the network device in the absence of TA and the time delay of the uplink signal reaching the network device in the presence of TA. As shown in Figure 2A, in the absence of TA, the time delay of the uplink signal reaching the network device sent by different terminal devices (for example, terminal devices at different distances from the network device) is inconsistent, which may cause interference within the cell. After the introduction of TA, referring to Figure 2B, different terminal devices are configured with different uplink TAs, so that the time delay of the uplink signals sent by different terminal devices to reach the network device is consistent, which is conducive to avoiding interference within the cell. Taking the different terminal devices shown in Figure 2B as terminal device 1 and terminal device 2 as an example, if terminal device 1 and terminal device 2 receive downlink signals and send uplink signals synchronously, then the uplink signals sent by terminal device 1 and terminal device 2 will be 2T away from the network device respectively. p1 and 2T p2 In other words, if terminal device 1 and terminal device 2 receive downlink signals and send uplink signals synchronously, the TA amounts corresponding to terminal device 1 and terminal device 2 are 2T respectively. p1 and 2T p2 , thereby ensuring that the uplink signals of terminal device 1 and terminal device 2 reach the network device at the same time.

[0047] The network device can determine the TA value of each terminal device by measuring the uplink transmission of the terminal device. The network device can send a TA command to the terminal device to notify the terminal device of its corresponding TA value. For example, the network device can send a TA command to the terminal device in two ways, as follows:

[0048] Method 1: Acquisition of the initial TA: The terminal device can achieve initial uplink synchronization through a random access process. During the random access process, the network device can determine the TA value by measuring the received preamble and send it to the terminal device through the TA command (Timing Advance Command, TAC) field of the random access response (RAR) message. For example, the network device can carry a 12-bit TAC in the RAR message to indicate the initial TA to the terminal device.

[0049] Method 2, adjustment of TA in radio resource control (RRC) connection state: Although the terminal device and the network device achieve uplink synchronization during the random access process, the timing of the uplink signal reaching the network device may change over time. For example, in unstable environments such as multipath propagation and clock drift, the uplink synchronization may change. Therefore, the terminal device needs to continuously update its uplink TA amount to maintain uplink synchronization. If the TA of a terminal device needs to be corrected, the network device can send a TA command to the terminal device, requesting it to adjust the uplink timing. In some implementations, the TA command is sent by the network device to the terminal device through a media access control control element (MAC CE). This MAC CE can also be called a TA command MAC CE (i.e., a MAC CE carrying a TA command). That is, when the terminal device is in the RRC connection state, the terminal device can adjust the uplink transmission according to the MAC CE carrying the TA command.

[0050] In scenarios such as carrier aggregation and multiple-input multiple-output (MIMO), a terminal device can support different carriers or serving cells. Different carriers can have different TAs. Therefore, the concept of a timing advance group (TAG) is introduced. Typically, a TAG includes the TAs of one or more serving cells. In other words, multiple serving cells in the same TAG have the same TA.

[0051] Multi-transmit / receive point (TRP) communication scenario

[0052] In some communication systems (such as NR), network equipment can be equipped with multiple TRPs. That is, the network equipment can communicate with the terminal device via one or more of the multiple TRPs, which is also called "multi-TRP communication". The multi-TRP solution can provide high reliability, large range and high throughput network performance through flexible deployment. In the embodiment of the present application, TRP refers to a transmission or receiving point in a wireless communication system, and can also be a base station, relay station or other communication equipment.

[0053] FIG3 is a schematic diagram of a multi-TRP scenario using the wireless communication method provided in an embodiment of the present application. FIG3 shows a terminal device 310 and multiple transmission points (TRP1, TRP2, ..., TRPn). The serving cell can perform resource scheduling for the terminal device 310 from multiple transmission points, thereby providing better coverage, reliability, and data rate for the physical downlink shared channel (PDSCH), physical downlink control channel (PDCCH), physical uplink shared channel (PUSCH), and physical uplink control channel (PUCCH).

[0054] The downlink scheduling modes of multiple TRPs include single DCI mode and multi-DCI mode. The following describes these two modes separately.

[0055] In single-DCI mode, a terminal device is scheduled by multiple TRPs using the same DCI. In multi-DCI mode, each TRP is scheduled using its own DCI. For multi-DCI mode, taking TRP1 and TRP2 as an example, TRP1 can schedule the transmission of PDSCH1 using the DCI carried by PDCCH1, and TRP2 can schedule the transmission of PDSCH2 using the DCI carried by PDCCH2.

[0056] Multiple TRP communication scenarios can be applied in multiple-input, multiple-output (MIMO) systems. MIMO systems using multiple TRPs can provide spatial diversity. The spatial distribution of multiple TRPs can provide even greater spatial diversity, helping to reduce spatial signal attenuation and improve signal reliability.

[0057] By properly designing and controlling the antenna configurations of multiple TRPs, the beamforming functions of each TRP can be coordinated to achieve beamforming, thereby concentrating signal energy in a specific direction and improving signal strength. Multiple TRPs can better utilize the different paths in a multipath propagation environment, reducing the impact of multipath effects on signals. MIMO systems can significantly increase the capacity of communication systems, allowing for the simultaneous transmission of multiple data streams and improving system throughput.

[0058] In a MIMO system based on multiple TRPs, since the distances between a terminal device and multiple TRPs are different, when the terminal device sends uplink information to multiple TRPs at the same time,

[0059] Because the distances between multiple TRPs and terminal devices vary, in order to improve the uplink transmission performance of the MIMO system, some related technologies can configure different TAs for uplink transmission between the terminal device and each TRP. This usually involves implementing timing advance changes between different transmission points within the same cell. In this case, the following aspects need to be considered:

[0060] 1) Multi-TA support: The communication system needs to support the configuration and management of multiple TAs to adapt to the timing advance requirements of different TRPs.

[0061] 2) PDCCH order triggering random access channel (RACH) process: If the PDCCH order triggering RACH process is involved, it may be necessary to ensure support for PDCCH order triggering RACH to different TRPs in multi-TRP operation.

[0062] 3) Downlink reference timing: The reference timing for the downlink may need to be adjusted according to the timing advance of different TRPs.

[0063] 4) Management of synchronization signal block (SSB) and physical layer reference signal (PL-RS): For power control of PRACH transmission, it may be necessary to consider the management of SSB and PL-RS, especially in the case of cross-TRP.

[0064] During uplink transmission with multiple TRPs, the terminal device uses the downlink reference timing of each TRP as a reference, adjusts the TA forward based on the downlink reference timing, and sends it in advance, so that multiple TRPs can receive the uplink information sent by the terminal device simultaneously or almost simultaneously. The downlink reference timing can be, for example, the timing determined by the terminal device when synchronizing with multiple TRPs in the downlink.

[0065] In the above technical solution, the terminal device locally stores the correspondence between the timing advance group identifier and the downlink reference timing. When sending uplink data, it determines the downlink reference timing corresponding to the TA based on this correspondence and then adjusts the TA based on this downlink reference timing. However, this approach is not flexible enough and cannot adapt to changing communication scenarios.

[0066] FIG4 is a schematic flowchart of a wireless communication method provided in an embodiment of the present application. FIG4 describes the interaction between a terminal device and a first transmission point. The terminal device may be terminal device 110 in FIG1 or terminal device 310 in FIG3. The wireless communication method in FIG4 includes steps S410-S420.

[0067] In step S410, a first transmission point sends first information to a terminal device.

[0068] The first transmission point may be one of a plurality of transmission points communicating with the terminal device, wherein the plurality of transmission points may be, for example, some or all of the TRPs among TRP1 -TRPn in FIG. 3 .

[0069] The embodiment of the present application does not specifically limit the number of multiple transmission points. As an example, the number of the multiple transmission points may be two, and the two transmission points may be TRP1 and TRP2 in Figure 1. The first transmission point may be TRP1, for example.

[0070] Multiple transmission points can communicate with a terminal device simultaneously. This transmission mode is also called multi-transmission point transmission, mTRP transmission, or M-TRP transmission. Multiple transmission points can send downlink data to a terminal device in the following two ways:

[0071] Method 1: Single-PDCCH-based solution, also known as single-DCI solution. The terminal device detects only one PDCCH and obtains a single DCI from it. This DCI can be used to indicate relevant information transmitted simultaneously on multiple transmission points. This method has low detection complexity.

[0072] Method 2: A multi-PDCCH-based solution, also known as a multi-DCI solution. A terminal device can receive different PDCCHs from different transmission points. Each PDCCH can contain a DCI that indicates the data transmission information for each transmission point. This method may increase complexity, but it offers greater flexibility and robustness.

[0073] In a communication system with multiple transmission points, the multiple transmission points may be located in the same cell or in different cells; or the multiple transmission points may not all be located in the same cell. In other words, some of the multiple transmission points may be located in the same cell.

[0074] The technical solution provided in the embodiments of the present application is mainly applied to a multi-DCI scenario in which multiple transmission points are located in the same cell.

[0075] The embodiment of the present application does not limit the indication method of the first information. The first information can be carried in a PDCCH order (PDCCH order); or, the first information can also be carried in a DCI.

[0076] In some implementations, the first information may be a bit field in the DCI, which may be a newly added field in the DCI; or, it may be an existing field in the DCI, i.e., the first information is represented by multiplexing an existing field. The terminal device may determine the first information by receiving and parsing the PDCCH command or the DCI.

[0077] In step S420, the terminal device determines a first downlink reference timing corresponding to the first TA based on the first information.

[0078] The first TA is the timing advance between the terminal device and the first transmission point. The terminal device can transmit in advance based on the first TA to achieve uplink synchronization between the terminal device and the first transmission point. The first downlink reference timing is a timing signal used for synchronization and timing in the downlink between the first transmission point and the terminal device. The terminal device can adjust its clock based on the downlink reference timing to maintain downlink synchronization with the first transmission point. In other words, the first downlink reference timing corresponds to both the first TA and the first transmission point.

[0079] For a communication system with multiple cells, cells with the same TA form a timing advance group TAG. Each TAG may include one or more cells. The cells included in each TAG may use the same TA; each TAG has a TAG ID.

[0080] The above-mentioned first TA is the timing advance when the terminal device communicates with the first transmission point, that is, the first TA corresponds to the first transmission point; the first TA corresponds to the first timing advance group TAG1, and the first timing advance group TAG1 has a unique timing advance group identifier TAG ID; therefore, the first timing advance TA, the first timing advance group TAG1, and the first timing advance group identifier TAG ID all correspond to the first transmission point.

[0081] After determining the first downlink reference timing corresponding to the first TA, the terminal device can determine how to adjust the uplink transmission based on the first downlink reference timing; that is, after determining the downlink reference timing, determine the timing of early uplink transmission to achieve the purpose of uplink synchronization.

[0082] In some embodiments, the first information is used to indicate a method for determining the first downlink reference timing. In some implementations, the first information may directly indicate a method for determining the first downlink reference timing. For example, the first information may directly indicate a method for determining the first downlink reference timing. In other implementations, the first information may also indirectly indicate a method for determining the first downlink reference timing. The first information may also be a parameter associated with a method for determining the first downlink reference timing. The terminal device receives the first information and determines a method for determining the first downlink reference timing based on the parameter associated with the determination method in the first information.

[0083] In an embodiment of the present application, a first transmission point sends first information to a terminal device, so that the terminal device can determine a first downlink reference timing corresponding to a first TA based on a determination method indicated by the first information, thereby performing uplink synchronization based on the first TA and the first downlink reference timing, providing a clear solution for the terminal device to determine the downlink reference timing corresponding to the TA.

[0084] The following is a detailed description of the method for determining the first downlink reference timing.

[0085] In some embodiments, the first downlink reference timing is determined in a manner including a first manner and a second manner. The first information may be used to indicate whether the first downlink reference timing is determined in the first manner or the second manner.

[0086] The first method may include: determining the first downlink reference timing based on a first correspondence between the TA and the downlink reference timing. The first method may also be referred to as a traditional method.

[0087] As mentioned above, a terminal device can be connected to multiple transmission points simultaneously. Depending on the transmission point, the terminal device needs to transmit uplink signals with different timing advances to synchronize with the multiple transmission points. In this case, the terminal device maintains multiple timing advance groups, each of which is associated with a downlink reference sequence. Each timing advance group corresponds to a timing advance.

[0088] The timing advance amount in each timing advance group may be determined by: during random access of a terminal device to a transmission point, the transmission point measures the preamble sent by the terminal device to determine the TA value, and transmits the value to the terminal device via the TAC field of a RAR message. For example, the first transmission point may include a 12-bit TAC in the RAR message to indicate the initial TA to the terminal device.

[0089] The downlink reference timing can be the reference timing used for downlink synchronization with the transmission point during the initial access process of the terminal device. The terminal device adjusts the timing advance corresponding to the downlink reference timing based on the downlink reference timing, or in other words, adds the time advance corresponding to the TA value to the downlink reference timing and sends uplink data based on this timing.

[0090] The second method may include: determining the first downlink reference timing based on the SSB indicated in the PDCCH command. The SSB is also called the target SSB.

[0091] The way in which the PDCCH command indicates SSB can be direct or indirect, and this embodiment of the present application does not limit this.

[0092] During the communication between the terminal device and the first transmission point, the first transmission point can periodically send an SSB burst set; each SSB burst set includes multiple SSBs, and the multiple SSBs are sent in a beam scanning manner within the same transmission cycle, that is, at different times, the SSBs are sent using beams in different directions.

[0093] The target SSB may be one of a plurality of SSBs in an SSB burst set transmitted by the first transmission point in any period.

[0094] In some embodiments, the target SSB is one with lower transmission delay and / or path loss in the beam direction corresponding to multiple SSBs.

[0095] As the terminal device moves, the relative position between the terminal device and the first transmission point will change. The first downlink reference timing is determined by using the real-time changing SSB. On this basis, the uplink transmission timing is adjusted in advance, which can improve the success rate of the uplink transmission.

[0096] In some embodiments, the first information is represented by a first bit, and different values ​​of the first bit may correspond to different methods for determining the first downlink reference timing. For example, the value of the first bit may be 0 or non-0. If the value of the first bit is 0, the method for determining the first downlink signal is the first method described above; if the value of the first bit is non-0, the method for determining the first downlink reference timing is the second method. Of course, in some implementations, if the value of the first bit is non-0, the method for determining the first downlink signal is the first method described above. If the value of the first bit is 0, the method for determining the first downlink reference timing is the second method.

[0097] The first bit may include one bit or multiple bits, which is not specifically limited in the embodiment of the present application.

[0098] In some embodiments, the first bit is a bit field in the DCI, and the bit field may be a newly added field in the DCI or a reused existing field in the DCI.

[0099] In some embodiments, the plurality of transmission points further include a second transmission point. The second transmission point is one of the plurality of transmission points communicating with the terminal device, and the second transmission point is a transmission point different from the first transmission point. The second transmission point may be, for example, TRP2 in FIG3 .

[0100] In some implementations, the first downlink reference timing is determined in a manner including a third manner and a fourth manner. The first information may be used to indicate whether the first downlink reference timing is determined using the third manner or the fourth manner.

[0101] The third and fourth methods are introduced below respectively.

[0102] In some implementations, the third method may include: determining a first downlink reference timing based on the first TA.

[0103] In some embodiments, determining the first downlink reference timing based on the first TA may refer to: determining the first downlink reference timing based on the first TA and the first corresponding relationship. The first corresponding relationship includes the corresponding relationship between the TA and the downlink reference timing. As mentioned above, the terminal device maintains multiple timing advance groups. Each timing advance group has a TA, and each timing advance group is associated with a downlink reference timing, that is, the terminal device maintains the corresponding relationship between multiple TAs and multiple downlink reference timings, that is, the first corresponding relationship mentioned above. Therefore, the terminal device can determine the first downlink reference timing corresponding to the first TA based on the first TA and the above-mentioned first corresponding relationship.

[0104] The terminal device can perform downlink synchronization based on the first downlink reference timing, adjust the uplink timing advance based on the first TA, and send an uplink signal to the first transmission point based on the adjusted uplink timing advance.

[0105] It should be noted that in this embodiment of the present application, the first transmission point is any one of the multiple transmission points communicating with the terminal device. Therefore, the terminal device can determine the downlink reference timing for advancing the uplink timing with each transmission point based on the TA between the terminal device and each transmission point. In other words, when communicating with each transmission point, the terminal device can determine the downlink reference timing corresponding to the TA between each transmission point based on the first correspondence. When transmitting uplink signals to each transmission point, the terminal device advances the transmission based on the corresponding reference timing and the respective TA. This ensures that the multiple transmission points communicating with the terminal device can simultaneously receive the uplink signals transmitted by the terminal device.

[0106] In some implementations, the fourth manner may include: determining the first downlink reference signal based on the second TA.

[0107] The second TA is a timing advance between the terminal device and the second transmission point. The second TA may be indicated by the second transmission point when performing downlink synchronization with the terminal device.

[0108] In some embodiments, determining the first downlink reference signal based on the second TA may include: determining the first downlink reference timing based on the second TA and a first corresponding relationship, wherein the first corresponding relationship includes a corresponding relationship between the TA and the downlink reference timing.

[0109] As previously mentioned, a terminal device can maintain multiple timing advance groups, each of which is associated with a downlink reference timing. Therefore, the terminal device can determine the timing advance group to which the second TA belongs based on the second TA, and then use the downlink reference timing corresponding to the timing advance group as the first downlink reference timing.

[0110] In the embodiment of the present application, the first transmission point is any one of the multiple transmission points. The downlink reference timing for timing advance between the terminal device and the multiple transmission points can be the same, and the downlink reference timing can be the downlink reference timing corresponding to the TA between the terminal device and any transmission point.

[0111] In some scenarios, a terminal device may only need to perform downlink synchronization with one transmission point to reduce communication complexity. For example, the terminal device may only need to perform downlink synchronization with the second transmission point. In other words, the first TA is measured when the terminal device is performing downlink synchronization with the second transmission point. When the terminal device uses the first TA to send an uplink signal to the first transmission point, it needs to send the uplink signal while performing downlink synchronization with the second transmission point. In other words, the terminal device needs to use the downlink reference timing corresponding to the second TA as the first downlink reference timing.

[0112] In some embodiments, the above-mentioned first information can be represented by a second bit, and different values ​​of the second bit correspond to different methods of determining the first downlink reference timing. The value of the second bit can be 0 or non-0 (for example, 1). If the value of the second bit is 0, the method of determining the first downlink signal is the third method; if the value of the second bit is non-0, the method of determining the first downlink reference timing is the fourth method. Of course, in some implementations, if the value of the second bit is non-0, the method of determining the first downlink signal is the first method mentioned above. If the value of the second bit is 0, the method of determining the first downlink reference timing is the second method.

[0113] The second bit may include one bit or multiple bits, which is not specifically limited in the embodiment of the present application.

[0114] In some embodiments, the second bit is a bit field in the DCI, which may be a newly added field in the DCI or a reused existing field in the DCI. The second field may be different from or the same as the first field.

[0115] In some embodiments, the first correspondence relationship may be a correspondence relationship stored in the terminal device, or the first correspondence relationship may be determined by the terminal device based on the second correspondence relationship and the third correspondence relationship.

[0116] The second correspondence includes the correspondence between TA and SSB, and the third correspondence includes the correspondence between SSB and downlink reference timing. By determining the first correspondence based on the second and third correspondences, the terminal device can flexibly select the beam for communicating with the first transmission point to ensure communication performance. For example, if the beam quality corresponding to SSB1 is good, the terminal device can select the downlink reference timing corresponding to SSB1 for downlink synchronization and use the TA corresponding to SSB1 for uplink timing advance.

[0117] The following describes a method for a terminal device to determine the first relationship based on the second and third correspondences. The terminal device may maintain multiple timing advance groups, each of which may be associated with one or more SSBs, i.e., the terminal device establishes a second correspondence between TAGs (TAs) and SSBs. Furthermore, the terminal device may maintain multiple downlink reference timings, each of which may be associated with an SSB, i.e., the terminal device establishes a third correspondence between SSBs and downlink reference timings.

[0118] For example, the second correspondence is: TAG1 is associated with SSB1 to SSB3, TAG2 is associated with SSB4 to SSB8, and the third correspondence is that SSB1 to SSB8 are associated with downlink reference timing 1 to downlink reference timing 8, respectively. After receiving an SSB (for example, SSB5), the terminal device determines that the timing advance corresponding to SSB5 is TA2 based on the second correspondence, and determines that the downlink reference timing corresponding to SSB5 is downlink reference timing 5 based on the third correspondence. The terminal device can perform downlink synchronization based on downlink reference timing 5 and use TA2 for uplink transmission.

[0119] It is understandable that multiple SSBs may correspond to the same TA, while different SSBs correspond to different downlink reference timings; in this case, in the first corresponding relationship, there is a possibility that the same TA corresponds to different downlink reference timings.

[0120] In some embodiments, a terminal device may send second information to a first transmission point, where the second information is used to indicate whether the terminal device is transmitting a directionally transmitted physical random access channel (PRACH) and / or whether to detect an SSB using a receive beam scanning method. The second information is used to determine a method for determining a first downlink reference timing. The first transmission point may determine a method for determining the first downlink reference timing based on the second information. Methods for determining the first downlink reference timing may include a third method and a fourth method.

[0121] As an example, if the terminal device is capable of transmitting PRACH directionally and the terminal device detects SSB in accordance with the receive beam scanning method, the first transmission point may use the third method or the fourth method as the method for determining the first downlink reference timing. As another example, if the terminal device transmits PRACH omnidirectionally and the terminal device detects SSB in accordance with the receive beam scanning method, the first transmission point may use the third method or the fourth method as the method for determining the first downlink reference timing. In this case, the first transmission point may give priority to the fourth method as the method for determining the first downlink reference timing. As another example, if the terminal device cannot detect SSB in accordance with the receive beam scanning method, the first transmission point may use the fourth method as the method for determining the first downlink reference timing.

[0122] If the terminal device does not detect SSBs using the receive beam scanning method, it may only detect the SSBs transmitted by the second transmission point. In some embodiments, the terminal device has synchronized with the second transmission point but not with the first transmission point. In other words, the terminal device has received the SSBs transmitted by the second transmission point but may not receive the SSBs transmitted by the first transmission point.

[0123] The second transmission point may be a transmission point with which the terminal device has already achieved synchronization, and the first transmission point may be a transmission point with which the terminal device has not yet achieved synchronization.

[0124] The following describes a specific method for determining the first downlink reference timing based on the second information with reference to an example. In the following, TRP2 may be the first transmission point, and TRP1 may be the second transmission point.

[0125] A terminal device communicates with multiple TRPs, including TRP1 and TRP2. The terminal device synchronizes with TRP1 using the SSB with index x (i.e., SSB x) in the SSB burst set. The terminal device may or may not detect SSB y sent by TRP2. Upon detecting SSB x, the terminal device transmits a PRACH.

[0126] After receiving SSB x, the terminal device will send PRACH. PRACH can be determined based on SSB x, or in other words, the time-frequency information and / or sequence information of PRACH can be determined based on SSB x.

[0127] The terminal device can send second information to TRP2 to indicate whether the terminal device sends PRACH in a directionally manner and / or whether to detect SSB in accordance with the receive beam scanning method.

[0128] If the terminal device sends PRACH omnidirectionally, both TRP1 and TRP2 will detect PRACH. At this time, TRP2 can determine the index of the SSB corresponding to the PRACH based on the time-frequency information and / or sequence information of the received PRACH, that is, calculate x, and determine that the PRACH is determined based on SSB x. In other words, TRP2 can determine the index (SSB x) of the SSB sent by TRP1 received by the terminal device. Therefore, TRP2 can use SSB x as a method for determining the first downlink reference timing. In addition, if the terminal device can detect SSB according to the receive beam scanning method, it means that the terminal device may be able to receive SSB y sent by TRP2. Therefore, TRP2 can also use SSB y as a method for determining the first downlink reference timing.

[0129] If the terminal device transmits PRACH in a directionally-directed manner, it can transmit PRACH in the direction corresponding to SSB y, indicating that the terminal device has received SSB y transmitted by TRP2. Furthermore, since PRACH is generated based on SSB x, TRP2 can also obtain SSB x. Therefore, TRP2 can use SSB x or SSB y as the first downlink reference timing determination method.

[0130] If the terminal device cannot detect SSB by beam scanning, it means that the terminal device can only receive SSB x but not SSB y. Therefore, the terminal device cannot determine the first downlink reference timing according to SSB y, and TRP2 can only use SSB x as the method for determining the first downlink reference timing.

[0131] In some implementations, TRP1 and TRP2 may not directly transmit SSBs. Instead, the SSBs are transmitted by reference cells of TRP1 and TRP2. For example, if TRPA is the reference cell of TRP1 and TRPB is the reference cell of TRP2, then TRPA transmits SSB x and TRPB transmits SSB y. The clocks of TRPA and TRP1 are synchronized, and those of TRPB and TRP2 are synchronized. In other words, the downlink reference timing of TRPA and TRP1 is the same, and the downlink reference timing of TRPB and TRP2 is the same.

[0132] The TA itself reflects the distance between the terminal device and the TRP. When multiple TAs are used, the terminal device's position can be more accurately located. Figure 5 shows a schematic diagram of measuring the position of a terminal device using two TAs. As shown in Figure 5, the distance between terminal device 510 and TRP1 can be estimated based on TA1, and the distance between terminal device 510 and TRP2 can be estimated based on TA2. Since the location information of TRP1 and TRP2 is known, two possible locations can be estimated based on the distance between terminal device 510 and the two TRPs. These two possible locations are Position 1 and Position 2 shown in Figure 6.

[0133] Without considering measurement errors, to select a location from Position 1 and Position 2, the terminal device needs to measure the signal of the third transmission point (TRP3) or send a signal to the third transmission point. The positioning solution unit uses the measurement results of TRP3 or sends a signal to TRP3 to obtain the measurement results, and uses this to determine whether the terminal device is located in Position 1 or Position 2. As shown in Figure 7, the distance from TRP3 to Position 1 and Position 2 is twice that of TRP3, and the measured reference signal receiving power (RSRP) will differ by approximately 3dB.

[0134] For the terminal device, since it does not have an RSRP baseline, the terminal device does not know whether the measured RSRP is a higher value or a lower value. The positioning server can make a rough estimate according to the traditional model.

[0135] In actual applications, there will be multiple base stations or TRPs in the communication system. The approximate location of the terminal device can be estimated based on the RSRP measurement results of multiple base stations or TRPs, thereby distinguishing whether the terminal device is in position 1 or position 2.

[0136] The method embodiment of the present application is described in detail above in conjunction with Figures 1 to 7 . The device embodiment of the present application is described in detail below in conjunction with Figures 8 to 10 . It should be understood that the description of the method embodiment corresponds to the description of the device embodiment. Therefore, for parts not described in detail, reference can be made to the above method embodiment.

[0137] FIG8 is a schematic block diagram of a terminal device provided in an embodiment of the present application. The terminal device may be any of the terminal devices described above, and includes a receiving unit 810 and a first determining unit 820 .

[0138] The receiving unit 810 is configured to receive first information sent by a first transmission point.

[0139] A first determination unit 820 is configured to determine, based on the first information, a first downlink reference timing corresponding to a first TA; wherein the first TA corresponds to the first transmission point, the first transmission point is one of multiple transmission points communicating with the terminal device, and the first information is used to indicate a method for determining the first downlink reference timing.

[0140] In some implementations, the method for determining the first downlink reference timing includes a first method and a second method, the first method including: determining the first downlink reference timing based on a first correspondence between TA and the downlink reference timing; the second method including: determining the first downlink reference timing based on the SSB indicated in the PDCCH command.

[0141] In some implementations, the first information is represented by a first bit. If the value of the first bit is 0, the first downlink reference timing is determined in the first manner; if the value of the first bit is not 0, the first downlink reference timing is determined in the second manner.

[0142] In some implementations, the multiple transmission points further include a second transmission point, and a method for determining the first downlink reference signal includes a third method and a fourth method; the third method includes determining the first downlink reference timing based on the first TA; and the fourth method includes determining the first downlink reference timing based on a second TA; wherein the second TA corresponds to the second transmission point.

[0143] In some implementations, the third method includes: determining the first downlink reference timing based on the first TA and the first corresponding relationship; the fourth method includes: determining the first downlink reference timing based on the second TA and the first corresponding relationship; the first corresponding relationship includes the corresponding relationship between TA and downlink reference timing.

[0144] In some implementations, the first information is represented by a second bit. If the value of the second bit is 0, the first downlink reference signal is determined in the third manner; if the value of the second bit is not 0, the first downlink reference signal is determined in the fourth manner.

[0145] In some implementations, the first information is carried in DCI.

[0146] In some implementations, the terminal device further includes: a second determination unit, configured to determine the first correspondence based on a second correspondence and a third correspondence; the second correspondence includes the correspondence between TA and SSB, and the third correspondence includes the correspondence between SSB and the downlink reference timing.

[0147] In some implementations, the terminal device further includes: a sending unit, configured to send second information to the first transmission point, wherein the second information is used to indicate whether the terminal device sends a physical random access channel PRACH in a directionally transmitted manner and / or whether to detect the SSB in accordance with a receive beam scanning method, and the second information is used to determine a method for determining the first downlink reference timing.

[0148] FIG9 is a schematic block diagram of a communication device provided in an embodiment of the present application, which may be the first transmission point described above. The communication device in FIG9 includes:

[0149] A sending unit 910 is configured to send first information to a terminal device; the first information is used to enable the terminal device to determine a first downlink reference timing corresponding to a first TA based on the first information; wherein the first TA corresponds to the first transmission point, the first transmission point is one of multiple transmission points communicating with the terminal device, and the first information is used to indicate a method for determining the first downlink reference timing.

[0150] In some implementations, the method for determining the first downlink reference timing includes a first method and a second method, the first method including: determining the first downlink reference timing based on a first correspondence between TA and the downlink reference timing; the second method including: determining the first downlink reference timing based on the SSB indicated in the PDCCH command.

[0151] In some implementations, the first information is represented by a first bit. If the value of the first bit is 0, the first downlink reference timing is determined in the first manner; if the value of the first bit is not 0, the first downlink reference timing is determined in the second manner.

[0152] In some implementations, the multiple transmission points further include a second transmission point, and a method for determining the first downlink reference signal includes a third method and a fourth method; the third method includes determining the first downlink reference timing based on the first TA; and the fourth method includes determining the first downlink reference timing based on a second TA; wherein the second TA corresponds to the second transmission point.

[0153] In some implementations, the third method includes: determining the first downlink reference timing based on the first TA and the first corresponding relationship; the fourth method includes: determining the first downlink reference timing based on the second TA and the first corresponding relationship; the first corresponding relationship includes the corresponding relationship between TA and downlink reference timing.

[0154] In some implementations, the first information is represented by a second bit. If the value of the second bit is 0, the first downlink reference signal is determined in the third manner; if the value of the second bit is not 0, the first downlink reference signal is determined in the fourth manner.

[0155] In some implementations, the first information is carried in DCI.

[0156] In some implementations, the first correspondence is determined based on a second correspondence and a third correspondence, where the second correspondence includes a correspondence between TA and SSB, and the third correspondence includes a correspondence between SSB and downlink reference timing.

[0157] In some implementations, the communication device further includes: a receiving unit for receiving second information sent by the terminal device, wherein the second information is used to indicate whether the terminal device sends PRACH in a directionally transmitted manner and / or whether to detect SSB in accordance with a receiving beam scanning method, and the second information is used to determine a method for determining the first downlink reference timing.

[0158] Figure 10 is a schematic structural diagram of a communication device according to an embodiment of the present application. Dashed lines in Figure 10 indicate that the unit or module is optional. Apparatus 1000 may be used to implement the method described in the above method embodiment. Apparatus 1000 may be a chip or a communication device. The communication device may be any of the communication devices described above. For example, the communication device may be a terminal device or a first transmission point.

[0159] The device 1000 may include one or more processors 1010. The processor 1010 may support the device 1000 to implement the method described in the method embodiment above. The processor 1010 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be 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.

[0160] The apparatus 1000 may further include one or more memories 1020. The memories 1020 store programs that can be executed by the processor 1010, causing the processor 1010 to perform the methods described in the above method embodiments. The memories 1020 may be independent of the processor 1010 or integrated into the processor 1010.

[0161] The apparatus 1000 may further include a transceiver 1030. The processor 1010 may communicate with other devices or chips via the transceiver 1030. For example, the processor 1010 may transmit and receive data with other devices or chips via the transceiver 1030.

[0162] The present invention also provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to the communication device provided in the present invention, and the program enables a computer to execute the method performed by the communication device in each embodiment of the present invention.

[0163] The present application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to the communication device provided in the present application, and the program causes a computer to execute the method performed by the communication device in each embodiment of the present application.

[0164] The embodiments of the present application also provide a computer program. The computer program can be applied to the communication device provided in the embodiments of the present application, and the computer program enables a computer to execute the method executed by the communication device in each embodiment of the present application.

[0165] 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.

[0166] 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.

[0167] In the embodiments of this application, the term "include" can refer to direct inclusion or indirect inclusion. Alternatively, the term "include" in the embodiments of this application can be replaced with "indicates" or "is used to determine." For example, "A includes B" can be replaced with "A indicates B" or "A is used to determine B."

[0168] 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.

[0169] 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.

[0170] 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.

[0171] 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.

[0172] 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.

[0173] 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.

[0174] 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.

[0175] 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.

[0176] 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.

[0177] 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)).

[0178] 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 wireless communication method, characterized in that: include: The terminal device receives first information sent by the first transmission point; The terminal device determines, based on the first information, a first downlink reference timing corresponding to a first timing advance TA; The first TA corresponds to the first transmission point, the first transmission point is one of multiple transmission points communicating with the terminal device, and the first information is used to indicate a method for determining the first downlink reference timing.

2. The method according to claim 1, characterized in that The method for determining the first downlink reference timing includes a first method and a second method. The first manner includes: determining the first downlink reference timing based on a first correspondence between the TA and the downlink reference timing; The second method includes: determining the first downlink reference timing based on the synchronization signal block SSB indicated in the physical downlink control channel PDCCH command.

3. The method according to claim 2, characterized in that The first information is represented by the first bit. If the value of the first bit is 0, the first downlink reference timing is determined in the first manner; if the value of the first bit is not 0, the first downlink reference timing is determined in the second manner.

4. The method according to claim 1, wherein The multiple transmission points further include a second transmission point, and the manner of determining the first downlink reference signal includes a third manner and a fourth manner; The third manner includes: determining the first downlink reference timing based on the first TA; The fourth manner includes: determining the first downlink reference timing based on a second TA; The second TA corresponds to the second transmission point.

5. The method according to claim 4, characterized in that The third manner includes: determining the first downlink reference timing based on the first TA and the first corresponding relationship; The fourth manner includes: determining the first downlink reference timing based on the second TA and the first corresponding relationship; The first corresponding relationship includes a corresponding relationship between TA and downlink reference timing.

6. The method according to claim 5, characterized in that The first information is represented by a second bit. If the value of the second bit is 0, the first downlink reference signal is determined in the third manner. If the value of the second bit is non-zero, the first downlink reference signal is determined in the fourth manner.

7. The method according to any one of claims 2, 3, 5 and 6, characterized in that: The method further comprises: The terminal device determines the first corresponding relationship based on the second corresponding relationship and the third corresponding relationship; Among them, the second corresponding relationship includes the corresponding relationship between TA and SSB, and the third corresponding relationship includes the corresponding relationship between SSB and downlink reference timing.

8. The method according to any one of claims 1 to 7, characterized in that The method further comprises: The terminal device sends second information to the first transmission point, where the second information is used to indicate whether the terminal device sends a physical random access channel PRACH in a directionally transmitted manner and / or whether to detect the SSB in a receive beam scanning manner, and the second information is used to determine a method for determining the first downlink reference timing.

9. A wireless communication method, characterized in that: include: The first transmission point sends first information to the terminal device; The first information is used to enable the terminal device to determine a first downlink reference timing corresponding to a first timing advance TA based on the first information; The first TA corresponds to the first transmission point, the first transmission point is one of multiple transmission points communicating with the terminal device, and the first information is used to indicate a method for determining the first downlink reference timing.

10. The method according to claim 9, characterized in that The method for determining the first downlink reference timing includes a first method and a second method. The first manner includes: determining the first downlink reference timing based on a first correspondence between the TA and the downlink reference timing; The second method includes: determining the first downlink reference timing based on the synchronization signal block SSB indicated in the physical downlink control channel PDCCH command.

11. The method according to claim 10, characterized in that The first information is represented by the first bit. If the value of the first bit is 0, the first downlink reference timing is determined in the first manner; if the value of the first bit is not 0, the first downlink reference timing is determined in the second manner.

12. The method according to claim 9, characterized in that The multiple transmission points further include a second transmission point, and the manner of determining the first downlink reference signal includes a third manner and a fourth manner; The third manner includes: determining the first downlink reference timing based on the first TA; The fourth manner includes: determining the first downlink reference timing based on a second TA; The second TA corresponds to the second transmission point.

13. The method according to claim 12, characterized in that The third manner includes: determining the first downlink reference timing based on the first TA and the first corresponding relationship; The fourth manner includes: determining the first downlink reference timing based on the second TA and the first corresponding relationship; The first corresponding relationship includes a corresponding relationship between TA and downlink reference timing.

14. The method according to claim 13, characterized in that The first information is represented by a second bit. If the value of the second bit is 0, the first downlink reference signal is determined in the third manner. If the value of the second bit is non-zero, the first downlink reference signal is determined in the fourth manner.

15. The method according to any one of claims 10, 11, 13 and 14, characterized in that The first correspondence is determined based on a second correspondence and a third correspondence, wherein the second correspondence includes a correspondence between TA and SSB, and the third correspondence includes a correspondence between SSB and downlink reference timing.

16. The method according to any one of claims 9 to 15, characterized in that The method further comprises: The first transmission point receives second information sent by the terminal device, where the second information is used to indicate whether the terminal device sends a physical random access channel PRACH in a directionally transmitted manner and / or whether to detect the SSB in a receive beam scanning manner, and the second information is used to determine a method for determining the first downlink reference timing.

17. A terminal device, characterized in that: include: a receiving unit, configured to receive first information sent by a first transmission point; A first determining unit, configured to determine a first downlink reference timing corresponding to a first timing advance TA based on the first information; The first TA corresponds to the first transmission point, the first transmission point is one of multiple transmission points communicating with the terminal device, and the first information is used to indicate a method for determining the first downlink reference timing.

18. The terminal device according to claim 17, characterized in that The method for determining the first downlink reference timing includes a first method and a second method. The first manner includes: determining the first downlink reference timing based on a first correspondence between the TA and the downlink reference timing; The second method includes: determining the first downlink reference timing based on the synchronization signal block SSB indicated in the physical downlink control channel PDCCH command.

19. The terminal device according to claim 18, characterized in that The first information is represented by the first bit. If the value of the first bit is 0, the first downlink reference timing is determined in the first manner; if the value of the first bit is not 0, the first downlink reference timing is determined in the second manner.

20. The terminal device according to claim 17, wherein: The multiple transmission points further include a second transmission point, and the manner of determining the first downlink reference signal includes a third manner and a fourth manner; The third manner includes: determining the first downlink reference timing based on the first TA; The fourth manner includes: determining the first downlink reference timing based on a second TA; The second TA corresponds to the second transmission point.

21. The terminal device according to claim 20, characterized in that The third manner includes: determining the first downlink reference timing based on the first TA and the first corresponding relationship; The fourth manner includes: determining the first downlink reference timing based on the second TA and the first corresponding relationship; The first corresponding relationship includes a corresponding relationship between TA and downlink reference timing.

22. The terminal device according to claim 21, characterized in that The first information is represented by a second bit. If the value of the second bit is 0, the first downlink reference signal is determined in the third manner. If the value of the second bit is non-zero, the first downlink reference signal is determined in the fourth manner.

23. The terminal device according to any one of claims 18, 19, 21 and 22, characterized in that: The terminal device further includes: a second determining unit, configured to determine the first corresponding relationship based on the second corresponding relationship and the third corresponding relationship; Among them, the second corresponding relationship includes the corresponding relationship between TA and SSB, and the third corresponding relationship includes the corresponding relationship between SSB and downlink reference timing.

24. The terminal device according to any one of claims 17 to 23, characterized in that: The terminal device further includes: A sending unit is used to send second information to the first transmission point, where the second information is used to indicate whether the terminal device sends a physical random access channel PRACH in a directionally transmitted manner and / or whether to detect SSB in accordance with a receive beam scanning method, and the second information is used to determine a method for determining the first downlink reference timing.

25. A communication device, characterized in that: The communication device is a first transmission point, including: A sending unit, configured to send first information to a terminal device; The first information is used to enable the terminal device to determine a first downlink reference timing corresponding to a first timing advance TA based on the first information; The first TA corresponds to the first transmission point, the first transmission point is one of multiple transmission points communicating with the terminal device, and the first information is used to indicate a method for determining the first downlink reference timing.

26. The communication device according to claim 25, characterized in that The method for determining the first downlink reference timing includes a first method and a second method. The first manner includes: determining the first downlink reference timing based on a first correspondence between the TA and the downlink reference timing; The second method includes: determining the first downlink reference timing based on the synchronization signal block SSB indicated in the physical downlink control channel PDCCH command.

27. The communication device according to claim 26, characterized in that The first information is represented by the first bit. If the value of the first bit is 0, the first downlink reference timing is determined in the first manner; if the value of the first bit is not 0, the first downlink reference timing is determined in the second manner.

28. The communication device according to claim 25, characterized in that The multiple transmission points further include a second transmission point, and the manner of determining the first downlink reference signal includes a third manner and a fourth manner; The third manner includes: determining the first downlink reference timing based on the first TA; The fourth manner includes: determining the first downlink reference timing based on a second TA; The second TA corresponds to the second transmission point.

29. The communication device according to claim 28, wherein The third manner includes: determining the first downlink reference timing based on the first TA and the first corresponding relationship; The fourth manner includes: determining the first downlink reference timing based on the second TA and the first corresponding relationship; The first corresponding relationship includes a corresponding relationship between TA and downlink reference timing.

30. The communication device according to claim 29, wherein The first information is represented by a second bit. If the value of the second bit is 0, the first downlink reference signal is determined in the third manner. If the value of the second bit is non-zero, the first downlink reference signal is determined in the fourth manner.

31. The communication device according to any one of claims 26, 27, 29 and 30, characterized in that: The first correspondence is determined based on a second correspondence and a third correspondence, wherein the second correspondence includes a correspondence between TA and SSB, and the third correspondence includes a correspondence between SSB and downlink reference timing.

32. The communication device according to any one of claims 25 to 31, characterized in that: The communication device further includes: A receiving unit is used to receive second information sent by the terminal device, where the second information is used to indicate whether the terminal device sends a physical random access channel PRACH in a directionally transmitted manner and / or whether to detect SSB in accordance with a receiving beam scanning method, and the second information is used to determine a method for determining the first downlink reference timing.

33. A terminal device, characterized in that: The terminal device comprises a memory, a processor and a transceiver, 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 the method according to any one of claims 1 to 8.

34. A communication device, characterized in that: The communication device is a first transmission point, including a memory, a processor and a transceiver, 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 the method according to any one of claims 9 to 16.

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