Communication method and communication apparatus

Abstract

The present application provides a communication method and a communication apparatus. The method comprises: when there is no downlink between a terminal device and a second network device in a millimeter wave frequency band, the terminal device determines, on the basis of a timing advance (TA) of a first network device in a low frequency band, a transmission moment at which the terminal device transmits an uplink signal to the second network device for the first time; the second network device provides a measurement result of the uplink signal to the first network device; and the first network device calculates a timing adjustment amount on the basis of the measurement result and delivers same to a UE, so as to realize closed-loop adjustment of the transmission moment of the uplink signal of the UE. The second network device can correctly receive the uplink signal of the terminal device without the need of receiving, by the terminal device, a downlink synchronization signal of the second network device and a command used for indicating an uplink TA, so that the terminal device is not required to support a downlink function in the millimeter wave frequency band in hardware or can disable the downlink function, thereby reducing the complexity and costs of the terminal device.

Description

Communication method and communication apparatus

[0001] This application claims priority to the Chinese patent application No. 202411353454.7, filed on September 25, 2024, and entitled "Communication method and communication apparatus", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of wireless communication, and more particularly, to a communication method and a communication apparatus. BACKGROUND

[0003] Under an ideal line of sight (LOS) single path, the greater the bandwidth of a positioning sounding reference signal (PosSRS), the smaller the measurement error of a time of arrival (TOA). Under an actual multi-path, increasing the bandwidth of the PosSRS is beneficial to improving the multi-path resolution, and thus improving the measurement accuracy of the TOA, that is, the greater the bandwidth of the PosSRS, the higher the positioning accuracy. The 5th generation (5G) system has abundant spectrum resources in the millimeter wave frequency band, and the carrier bandwidth can reach 400MHz or 800MHz. A super large bandwidth of more than 800MHz can be obtained through co-construction and sharing between different operators. Therefore, high-precision positioning can be realized based on the millimeter wave.

[0004] In a positioning scheme based on the PosSRS, processes such as timing advance adjustment and open-loop power control are involved. In order to support the timing advance adjustment, a user equipment (UE) is required to support a downlink synchronization signal and synchronize with a base station in the millimeter wave frequency band; the UE needs to provide an uplink reference signal for the base station to measure a timing advance (TA); and the base station needs to issue a TA adjustment command, which requires the UE to support data transmission function. In order to support the open-loop power control, the UE needs to be able to measure a reference signal for calculating the downlink loss.

[0005] The millimeter wave frequency band belongs to a high frequency band. Currently, a UE supporting the millimeter wave frequency band generally also supports a low frequency band. The above-mentioned positioning scheme based on the PosSRS requires the UE to have complete or nearly complete 5G functions in the millimeter wave frequency band, which leads to an increase in the complexity and cost of the UE. SUMMARY

[0006] The present application provides a communication method and a communication apparatus, which can reduce the complexity and cost of a UE supporting the millimeter wave frequency band.

[0007] In a first aspect, a communication method is provided, which can be executed by a communication device or a module (e.g., a processor, a chip, a circuit, etc., which can also be a logical module, hardware and / or software capable of realizing all or part of the functions of the communication device) applied to the communication device. As an example, the communication device is a terminal device. The method comprises: transmitting one or more uplink signals to a second network device based on a first transmission time, there being no downlink between the terminal device and the second network device; receiving first information from the first network device, the first information indicating a timing adjustment amount, the timing adjustment amount being determined based on at least one of the one or more uplink signals; and adjusting the first transmission time based on the timing adjustment amount.

[0008] In the technical solution, the terminal device transmits one or more uplink signals, a second network device without a corresponding downlink with the terminal device measures the one or more signals to obtain information of a TA. The second network device transmits the information of the TA to the first network device. The first network device and the terminal device have complete uplink and downlink, the first network device determines a timing adjustment amount based on the received information of the TA measured by the second network device, and indicates the timing adjustment amount to the terminal device through the downlink between the first network device and the terminal device, thereby realizing closed-loop adjustment of the time at which the terminal device transmits the uplink signal to the second network device. The technical solution does not require the terminal device to support the downlink function of the operating frequency band (e.g., the millimeter wave frequency band) of the second network device in hardware, and can determine the timing at which the terminal device transmits the uplink signal, thereby reducing the complexity and cost of the terminal device.

[0009] The technical solution can be applied to a scenario in which the second network device receives the uplink signal of the terminal device, and solves the problem of determining the transmission timing of the uplink signal when there is no downlink between the second network device and the terminal device.

[0010] In combination with the first aspect, in some implementations of the first aspect, the first transmission time is a transmission time at which the terminal device first transmits the one or more uplink signals, and the first transmission time is determined based on the timing of the first network device.

[0011] In this implementation, in the closed-loop adjustment solution provided in the present application, for the case that the terminal device first transmits the uplink signal to the second network device, the timing (i.e., the transmission time) of the uplink signal is determined based on the timing of the first network device. After the second network device measures the uplink signal first transmitted by the terminal device to obtain the corresponding TA, subsequent closed-loop adjustment of the timing of the uplink signal transmitted by the terminal device can be realized.

[0012] In some implementations of the first aspect, the first transmission time point is determined based on a timing of the first network device, and the timing of the first network device is aligned with the first transmission time point, and the timing of the first network device is based on a downlink timing of the first network device and is advanced by half of a timing advance (TA) of the first network device.

[0013] In this implementation, the TA of the terminal device for first sending the uplink signal to the second network device is half of the TA of the first network device. Since there is a downlink between the first network device and the terminal device, the first network device indicates the timing advance of the first network device to the terminal device. Based on the downlink timing of the first network device, the timing of the first network device is advanced by half of the TA of the first network device, and the timing of the network side is obtained. The terminal device aligns the timing of the network side to send the uplink signal to the second network device. This implementation can solve the problem of the timing of the terminal device for first sending the uplink signal to the second network device.

[0014] In some implementations of the first aspect, in the frequency domain, each of the one or more uplink signals is sent on one of every M subcarriers, and in the time domain, the each uplink signal includes an equivalent cyclic prefix (CP) and valid data, the equivalent CP includes a cyclic prefix CP corresponding to the second network device and a time length of a first period of M periods corresponding to a data segment within one time domain symbol, and a time length of the valid data includes time lengths of the remaining M-1 periods other than the first period of the M periods, and M is a positive integer.

[0015] In this implementation, the equivalent cyclic prefix of the uplink signal sent by the UE is increased, and the coverage of the uplink signal is increased. In combination with the scheme for determining the first transmission time point, the coverage of the uplink signal sent by the terminal device for the first time can be increased.

[0016] In some implementations of the first aspect, the first information is received from the first network device, including receiving a paging message from the first network device, the paging message containing the first information, or receiving a MAC CE signaling from the first network device, the MAC CE signaling containing the first information.

[0017] In this implementation, the first network device sends the timing adjustment amount to the terminal device through different signaling based on that the terminal device is in an RRC inactive state or an RRC connected state.

[0018] With reference to the first aspect, in some implementations of the first aspect, the first network device and the second network device operate in different frequency bands, or the first network device and the second network device operate in the same frequency band.

[0019] The above solutions are applicable to scenarios in which the two network devices operate in the same frequency or different frequencies. When operating in the same frequency, the first network device can receive or can not receive the uplink signal between the terminal device and the second network device; when operating in different frequencies, the solution of the present application is applicable to a scenario in which the terminal device does not support or turn off the downlink function of the frequency band (for example, a high frequency band) corresponding to the second network device, and can reduce the complexity and cost of the terminal device.

[0020] In a second aspect, a communication method is provided, which can be executed by a communication device or a module (for example, a processor, a chip, a circuit, etc., which can also be a logical module, hardware and / or software capable of realizing all or part of the functions of the communication device) applied to the communication device. As an example, the communication device is a terminal device. The method includes: transmitting a first uplink signal; receiving first information, the first information indicating a timing adjustment amount, the timing adjustment amount being determined based on measurement results obtained by the first network device and the second network device respectively measuring the first uplink signal; and transmitting a second uplink signal based on the timing adjustment amount.

[0021] In the technical solution, the first network device and the second network device respectively measure the uplink signal of the terminal device to obtain respective measurement results. The first network device determines a timing adjustment amount based on the measurement results measured by the first network device and the second network device respectively, and indicates the timing adjustment amount to the terminal device through the first information, so as to adjust the timing of the uplink signal transmitted by the terminal device. When there is no downlink between the terminal device and the second network device, the transmission timing of the uplink signal on the uplink can also be determined.

[0022] The solution is applicable to a scenario in which the first network device and the second network device operate in the same frequency, for example, both operate in a low frequency band or a high frequency band.

[0023] In the solution, the measurement results can include timing advance (TA) and / or signal reception strength. Alternatively, the timing adjustment amount can be determined based on the TA and / or signal reception strength obtained by the first network device and the second network device respectively measuring the first uplink signal.

[0024] In some implementations of the second aspect, the measurement result includes the TA; and the timing adjustment amount is determined based on measurement results obtained by the first network device and the second network device respectively measuring the uplink signal, including: if a difference between the first TA and the second TA is greater than a first threshold, the timing adjustment amount is the second TA; or if a difference between the second TA and the first TA is greater than the first threshold, the timing adjustment amount is the first TA; wherein the first TA is a TA determined by the first network device measuring the first uplink signal, and the second TA is a TA determined by the second network device measuring the first uplink signal.

[0025] In this implementation, the timing adjustment amount is determined according to the size relationship between the TAs determined by the first network device and the second network device respectively by measuring the first uplink signal. Specifically, the TA of the terminal device sending the uplink signal is determined as the smaller TA, and at the same time, the network device corresponding to the smaller TA can be used to receive the uplink signal of the terminal device, so as to improve the reception quality of the uplink signal.

[0026] In some implementations of the second aspect, the measurement result includes the TA; and the timing adjustment amount is determined based on measurement results obtained by the first network device and the second network device respectively measuring the uplink signal, including: the timing adjustment amount is a value between the first TA and the second TA, wherein the first TA is a TA determined by the first network device measuring the first uplink signal, and the second TA is a TA determined by the second network device measuring the first uplink signal, and the first TA and the second TA are values other than those satisfying the following constraints: a difference between the first TA and the second TA is greater than a first threshold, or a difference between the second TA and the first TA is greater than the first threshold.

[0027] In this implementation, the first network device and the second network device both receive the uplink signal of the terminal device.

[0028] In some implementations of the second aspect, the measurement result includes the signal receiving strength; and the timing adjustment amount is determined based on the measurement result obtained by the first network device and the second network device measuring the uplink signal, including: if a difference between the first signal receiving strength and the second signal receiving strength is greater than a second threshold, the timing adjustment amount is the first TA; or if a difference between the second signal receiving strength and the first signal receiving strength is greater than the second threshold, the timing adjustment amount is the second TA; wherein the first signal receiving strength and the first TA are obtained by the first network device measuring the first uplink signal, and the second signal receiving strength and the second TA are obtained by the second network device measuring the first uplink signal.

[0029] In this implementation, the timing adjustment amount is determined according to the signal receiving strength obtained by the first network device and the second network device measuring the first uplink signal. Specifically, the timing adjustment amount can be the TA determined by the network device with a greater measured signal receiving strength. Meanwhile, the network device with a greater signal receiving strength serves as the receiving device of the uplink signal of the terminal device, so as to improve the receiving quality of the uplink signal.

[0030] In some implementations of the second aspect, the measurement result includes the TA and the signal receiving strength; and the timing adjustment amount is determined based on the measurement result obtained by the first network device and the second network device measuring the uplink signal, including: if a difference between the second TA and the first TA is greater than a first threshold, and a difference between the first signal receiving strength and the second signal receiving strength is greater than a second threshold, the timing adjustment amount is the first TA; or if a difference between the first TA and the second TA is greater than the first threshold, and a difference between the second signal receiving strength and the first signal receiving strength is greater than the second threshold, the timing adjustment amount is the second TA; wherein the first signal receiving strength and the first TA are obtained by the first network device measuring the first uplink signal, and the second signal receiving strength and the second TA are obtained by the second network device measuring the first uplink signal.

[0031] In this implementation, the timing adjustment amount is determined according to the TA and the signal receiving strength obtained by the first network device and the second network device measuring the first uplink signal.

[0032] In some implementations of the second aspect, the first network device and the second network device work in the same frequency band.

[0033] In a third aspect, a communication method is provided, which can be performed by a communication device or a module (e.g., a processor, a chip, a circuit, etc., which can also be a logical module, hardware and / or software capable of realizing all or part of the functions of the communication device) applied to the communication device. As an example, the communication device is a network device. The method includes: obtaining, from a second network device, information of a timing advance (TA), the information of the TA being obtained by the second network device from measurement on at least one of one or more uplink signals from a terminal device, and there being no downlink between the second network device and the terminal device; determining a timing adjustment amount based on the information of the TA; and sending first information, the first information indicating the timing adjustment amount, the timing adjustment amount being used for the terminal device to adjust a first transmission time of an uplink signal sent to the second network device.

[0034] With reference to the third aspect, in some implementations of the third aspect, the first transmission time is a transmission time at which the terminal device first transmits the one or more uplink signals, and the first transmission time is determined based on timing of the first network device.

[0035] With reference to the third aspect, in some implementations of the third aspect, the first transmission time being determined based on timing of the first network device includes: the first transmission time being aligned with the timing of the first network device, and the timing of the first network device being advanced by half of a timing advance (TA) of the first network device based on downlink timing of the first network device.

[0036] With reference to the third aspect, in some implementations of the third aspect, in the frequency domain, each of the one or more uplink signals is transmitted on one of every M subcarriers, and in the time domain, each of the one or more uplink signals includes an equivalent cyclic prefix (CP) and valid data, the equivalent CP including a cyclic prefix CP corresponding to the second network device and a time length of a first period of M periods corresponding to a data segment within one time domain symbol, and a time length of the valid data including time lengths of the remaining M-1 periods other than the first period of the M periods, M being a positive integer.

[0037] With reference to the third aspect, in some implementations of the third aspect, the sending of the first information includes: sending a paging message, the paging message containing the first information; or sending MAC CE signaling, the MAC CE signaling containing the first information.

[0038] With reference to the third aspect, in some implementations of the third aspect, the first network device and the second network device operate in different frequency bands, or the first network device and the second network device operate in the same frequency band.

[0039] In a fourth aspect, a communication method is provided, which can be performed by a communication device or a module (e.g., a processor, a chip, a circuit, etc., which can also be a logical module, hardware and / or software capable of realizing all or part of the functions of the communication device) applied to the communication device. As an example, the communication device is a network device. The method comprises: measuring a first uplink signal from a terminal device to obtain a first measurement result; obtaining a second measurement result from a second network device, the second measurement result being determined by the second network device measuring the first uplink signal, and there being no downlink between the terminal device and the second network device; and determining a timing adjustment amount based on the first measurement result and the second measurement result, the timing adjustment amount being used for the terminal device to adjust a transmission time of a second uplink signal sent to the second network device.

[0040] With reference to the fourth aspect, in some implementations of the fourth aspect, the first measurement result or the second measurement result comprises a timing advance (TA) and / or a signal reception strength.

[0041] With reference to the fourth aspect, in some implementations of the fourth aspect, the first measurement result or the second measurement result comprises the TA; and the determining of the timing adjustment amount based on the first measurement result and the second measurement result comprises: if a difference between the first TA and the second TA is greater than a first threshold, the timing adjustment amount is determined as the second TA; or if a difference between the second TA and the first TA is greater than the first threshold, the timing adjustment amount is determined as the first TA; wherein the first TA is a TA determined by the first network device measuring the first uplink signal, and the second TA is a TA determined by the second network device measuring the first uplink signal.

[0042] With reference to the fourth aspect, in some implementations of the fourth aspect, the measurement result comprises the TA; and the determining of the timing adjustment amount based on the first measurement result and the second measurement result comprises: the timing adjustment amount being a value between the first TA and the second TA, wherein the first TA and the second TA are values other than those satisfying a constraint that a difference between the first TA and the second TA is greater than a first threshold, or a difference between the second TA and the first TA is greater than the first threshold, wherein the first TA is a TA determined by the first network device measuring the first uplink signal, and the second TA is a TA determined by the second network device measuring the first uplink signal.

[0043] In some implementations of the fourth aspect, the first measurement result or the second measurement result comprises the signal receiving strength; and the determining the timing adjustment amount based on the first measurement result and the second measurement result comprises: if a difference between the first signal receiving strength and the second signal receiving strength is greater than a second threshold, determining the timing adjustment amount as the first TA; or if a difference between the second signal receiving strength and the first signal receiving strength is greater than the second threshold, determining the timing adjustment amount as the second TA; wherein the first signal receiving strength and the first TA are obtained by the first network device measuring the first uplink signal, and the second signal receiving strength and the second TA are obtained by the second network device measuring the first uplink signal.

[0044] In some implementations of the fourth aspect, the first measurement result or the second measurement result comprises the TA and the signal receiving strength; and the determining the timing adjustment amount based on the first measurement result and the second measurement result comprises: if a difference between the second TA and the first TA is greater than a first threshold, and a difference between the first signal receiving strength and the second signal receiving strength is greater than a second threshold, the timing adjustment amount is the first TA; or if a difference between the first TA and the second TA is greater than the first threshold, and a difference between the second signal receiving strength and the first signal receiving strength is greater than the second threshold, the timing adjustment amount is the second TA; wherein the first signal receiving strength and the first TA are obtained by the first network device measuring the first uplink signal, and the second signal receiving strength and the second TA are obtained by the second network device measuring the first uplink signal.

[0045] In some implementations of the fourth aspect, the first network device and the second network device work in the same frequency band.

[0046] The method of the third aspect and the fourth aspect is a network side implementation of the method of the first aspect and the second aspect respectively, and the beneficial technical effects can refer to the description of the first aspect or the second aspect, which will not be repeated.

[0047] The fifth aspect provides a communication apparatus having a function of implementing the method in the first aspect or the second aspect, or any possible implementation of the aspects; or having a function of implementing the method in the third aspect or the fourth aspect, or any possible implementation of the aspects. The function can be implemented by hardware, or by hardware executing corresponding software. The hardware or software comprises one or more units corresponding to the above functions.

[0048] In a sixth aspect, a communication apparatus is provided with a function of implementing the method in the first aspect or the second aspect, or any possible implementation of these aspects; or a function of implementing the method in the third aspect or the fourth aspect, or any possible implementation of these aspects. The function can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

[0049] In a seventh aspect, a communication apparatus is provided, which includes at least one processor configured to cause the communication apparatus to perform the method in the first aspect or the second aspect, or any possible implementation of these aspects; or perform the method in the third aspect or the fourth aspect, or any possible implementation of these aspects. Optionally, the at least one processor is coupled with at least one memory for storing computer programs or instructions, and the at least one processor is configured to invoke and run the computer programs or instructions from the at least one memory, so as to cause the communication apparatus to perform the method in the first aspect or the second aspect, or any possible implementation of these aspects; or perform the method in the third aspect or the fourth aspect, or any possible implementation of these aspects. Optionally, the at least one processor can be included in the communication apparatus, or configured outside the communication apparatus. Optionally, the communication apparatus further includes the at least one memory. Optionally, the communication apparatus further includes at least one communication interface. As an example, the communication interface can include an input interface and / or an output interface, or an interface circuit.

[0050] In an eighth aspect, a communication apparatus is provided, which includes a communication interface and a circuit. The communication interface is configured to receive a signal to be processed, and transmit the signal to the circuit. The circuit is configured to process the signal, so as to perform the method in the first aspect or the second aspect, or any possible implementation of these aspects; or perform the method in the third aspect or the fourth aspect, or any possible implementation of these aspects. Optionally, the communication interface is further configured to output the signal processed by the circuit. Optionally, the signal can include information and / or data. Optionally, the communication apparatus can be a chip (such as a baseband chip) or a chip system.

[0051] In a ninth aspect, a computer readable storage medium is provided, which stores computer program codes or instructions. When the computer program or instructions are run on a computer, the method in the first aspect or the second aspect, or any possible implementation of these aspects is implemented; or the method in the third aspect or the fourth aspect, or any possible implementation of these aspects is implemented.

[0052] In a tenth aspect, a computer program product is provided, which comprises computer program codes or instructions, which, when run on a computer, cause the method in the first aspect or the second aspect, or any possible implementation of these aspects, to be implemented; or the method in the third aspect or the fourth aspect thereof, or any possible implementation of these aspects, to be implemented.

[0053] In an eleventh aspect, a wireless communication system is provided, which comprises the communication apparatus in the fifth aspect and the communication apparatus in the sixth aspect. BRIEF DESCRIPTION OF DRAWINGS

[0054] FIG. 1 is a known positioning scheme based on positioning sounding reference signals.

[0055] FIG. 2 is a schematic diagram of a system architecture suitable for embodiments of the present application.

[0056] FIG. 3 is a schematic flowchart of a communication method 300 provided by the present application.

[0057] FIG. 4 is a schematic diagram of a system architecture suitable for embodiments of the present application.

[0058] FIG. 5 is an example of determining a transmission time of a first uplink signal provided by the present application.

[0059] FIG. 6 is an example of comb-like transmission of uplink signals in the frequency domain provided by the present application.

[0060] FIG. 7 is a schematic diagram of TA closed-loop adjustment provided by the present application.

[0061] FIG. 8 is a schematic diagram of indicating a TAC of a positioning SRS by a MAC CE provided by the present application.

[0062] FIG. 9 is a schematic diagram of a system architecture suitable for embodiments of the present application.

[0063] FIG. 10 is a schematic flowchart of a communication method 900 provided by the present application.

[0064] FIG. 11 is a schematic structural diagram of a communication apparatus 1000 provided by the present application.

[0065] FIG. 12 is a schematic structural diagram of another communication apparatus provided by the present application.

[0066] FIG. 13 is a schematic structural diagram of a chip provided by the present application. DETAILED DESCRIPTION

[0067] The technical solutions in the present application will be described below with reference to the accompanying drawings.

[0068] Figure 1 is a known positioning scheme based on positioning sounding reference signal. The serving cell and neighbor cells obtain base station positioning measurements such as time of arrival (TOA), angel of arrival (AoA) based on positioning sounding reference signal (PosSRS). The following will refer to the positioning sounding reference signal as positioning SRS. Regarding the physical layer procedure of positioning SRS, the protocol has the following provisions:

[0069] 1) Timing advance (TA) adjustment of positioning SRS. The positioning SRS sent by the UE can be received by multiple cells, although the distance of the UE to these cells is different, but the TA of the positioning SRS is calculated based on the serving cell.

[0070] 2) Power control of positioning SRS. The UE measures the downlink signal of the target cell that needs to receive the positioning SRS, which is called the path loss reference signal. The UE performs open loop control on the transmission power of the positioning SRS according to the measured path loss.

[0071] The scheme shown in Figure 1 requires that the positioning terminal has complete or almost complete 5G functions in the millimeter wave frequency band. In order to support the positioning SRS timing advance adjustment:

[0072] 1) The UE needs to support SSB signals and synchronize with the base station downlink in the millimeter wave frequency band;

[0073] 2) The UE needs to provide an uplink reference signal for the base station to measure the TA;

[0074] 3) The base station needs to issue a TA adjustment command, which requires the UE to support data transmission functions.

[0075] In addition, in order to support the open loop power control of the positioning SRS:

[0076] 1) The UE needs to be able to measure the reference signal used to calculate the downlink path loss.

[0077] The current terminal supporting millimeter wave not only has complete millimeter wave functions, but also has relatively high specifications, such as supporting dual connectivity, carrier aggregation, and generally supporting both sub-6GHz and millimeter wave frequency bands. Ultimately, it leads to the increase of complexity and cost of millimeter wave terminals.

[0078] Therefore, the present application provides a low-cost millimeter wave frequency band positioning scheme, in which there is no downlink between the UE and the target receiving base station device. How to determine and control the transmission time of the uplink signal of the UE is a problem to be solved.

[0079] The present application provides two schemes for determining the first transmission time of an uplink signal in a scenario without downlink between a UE and a base station device, and a scheme for subsequent TA adjustment.

[0080] The technical scheme of the present application is introduced as follows.

[0081] The technical scheme of the present application can be applied to various existing communication systems and future communication systems, including but not limited to: satellite communication systems, the 5th generation (5G) system or new radio (NR) system, long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD) system, and future communication systems, etc. In addition, it can also be applied to sidelink (SL) communication, vehicle-to-everything (V2X) communication, machine to machine (M2M) communication, machine type communication (MTC), and internet of things (IoT) communication system or other communication systems, etc., which are not limited herein.

[0082] Exemplarily, the terminal device can also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, mobile terminal (MT), remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user apparatus. The terminal device in the embodiments of the present application can refer to a device providing voice and / or data connectivity for a user, and can be used to connect people, things and machines, for example, handheld devices with wireless connection function, vehicle-mounted devices, etc. The terminal device in the embodiments of the present application can be a mobile phone, a tablet computer, a notebook computer, a palm computer, 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 smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc. Optionally, the UE can be used to act as a base station. For example, the UE can act as a scheduling entity, which provides sidelink signals between UEs in V2X or SL, etc. The terminal device in the embodiments of the present application can support high frequency bands (or referred to as FR2 bands) corresponding to millimeter wave bands, and can also support low frequency bands (or referred to as FR1 bands).

[0083] In the embodiments of the present application, the device for implementing the functions of the terminal device can be a terminal device, or a device capable of supporting the terminal device to implement the corresponding functions, for example, a combination of a chip, a processor, a circuit, hardware and / or software. The device is located at the terminal side, and can be configured in the terminal device or used in matching with the terminal device. In the embodiments of the present application, only the device for implementing the corresponding functions of the terminal device is taken as an example to illustrate the terminal device.

[0084] The network device in the embodiments of the present application can include a device for communicating with a terminal device, and the network device can include an access network device or a radio access network device, for example, the network device can be a base station. The access network device in the embodiments of the present application can refer to a radio access network (RAN) node (or device) that accesses a terminal device to a wireless network. The base station can broadly cover the following various names, or be replaced by the following names, for example: Node B (NodeB), evolved Node B (eNB), next generation Node B (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), primary station, secondary station, motor slide retainer (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), radio unit (RU), positioning node, etc. The base station can be a macro base station, a micro base station, a relay node, a donor node or a combination thereof. The base station can also refer to a communication module, modem or chip used in the aforementioned device or apparatus. The base station can also be a mobile switching center and a device that performs the function of a base station in D2D, V2X, M2M communication, a network device (such as a base station) in a future communication network or a device that performs the function of a network device, etc. The base station can support networks of the same or different access technologies. Optionally, the RAN node can also be a server, a wearable device, a vehicle or a vehicle-mounted device, etc. For example, the access network device in the vehicle to everything (V2X) technology can be a road side unit (RSU). The embodiments of the present application do not limit the specific technology and specific device form of the network device.

[0085] The base station can be fixed or mobile. For example, a helicopter or a drone can be configured to act as a mobile base station, and one or more cells can move according to the location of the mobile base station. In other examples, the helicopter or the drone can be configured to serve as a device that communicates with another base station.

[0086] In some deployments, the network device in the embodiments of the present application can be a device including a CU, or a DU, or a device including a CU and a DU, or a control plane CU node (central unit-control plane, CU-CP) and a user plane CU node (central unit-user plane, CU-UP), and a DU node. For example, the network device can include a gNB-CU-CP, a gNB-CU-UP, and a gNB-DU.

[0087] In some deployments, wireless access is assisted by multiple RAN nodes cooperating to assist a terminal, and different RAN nodes respectively implement part of the functions of a base station. For example, the RAN node can be a CU, a DU, a CU-CP, a CU-UP, or an RU, etc. The CU and the DU can be separately arranged, or can also be included in the same network element, such as a BBU. The RU can be included in a radio frequency device or a radio frequency unit, such as an RRU, an AAU, or an RRH.

[0088] In different systems, the CU (or CU-CP and CU-UP), DU, or RU can also have different names, but those skilled in the art can understand their meanings. For example, in an open radio access network (open RAN, ORAN / O-RAN) system, the CU can also be referred to as an open CU (O-CU), and the DU can also be referred to as an open DU (O-DU). The CU-CP can also be referred to as an O-CU-CP, the CU-UP can also be referred to as an O-CU-UP, and the RU can also be referred to as an O-RU. Any one of the CU (or CU-CP, CU-UP), DU, and RU in the embodiments of the present application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0089] In the embodiments of the present application, the apparatus for implementing the functions of the network device can be a network device; it can also be an apparatus capable of supporting the network device to implement the corresponding functions, such as a chip, a processor, a circuit, a combination of hardware and / or software. The apparatus is located at the network side and can be configured in the network device or used in combination with the network device. In the embodiments of the present application, only the apparatus for implementing the corresponding functions of the network device is taken as an example for description.

[0090] FIG. 2 is a schematic diagram of a system architecture suitable for embodiments of the present application. As shown in FIG. 2, there are two types of base station devices in the system architecture, denoted as base station device 1 and base station device 2. Among them, the base station device 1 has complete downlink and uplink with the UE, and the base station device 2 only has uplink with the UE, and does not have downlink. The base station device 1 or the base station device 2 is deployed in the same BBU box or other technical means to make them time-synchronized.

[0091] The base station device 1 and the base station device 2 can work in the same frequency band or different frequency bands. The base station device 2 does not support the downlink function on the hardware or supports the downlink function on the hardware but closes the downlink function.

[0092] When the base station device 1 and the base station device 2 work in different frequency bands, the UE can not support or close the downlink function of the frequency band of the base station device 2 on the hardware. The downlink signaling of the base station device 2 is sent to the UE through the base station device 1. If the base station device 1 and the base station device 2 work in the same frequency, there can be two possible implementation manners: not caring whether the base station device 1 receives the uplink channel or the uplink signal between the UE and the base station device 2; or the base station device 1 receives the uplink channel or the uplink signal between the UE and the base station device 2.

[0093] FIG. 3 is a schematic flowchart of a communication method 300 provided by the present application. The method 300 can be implemented by a terminal device or an apparatus (such as a chip, a processor or a circuit, etc.) applied to the terminal device, and a network device or an apparatus (such as a chip, a processor or a circuit, etc.) applied to the network device to perform corresponding steps. Alternatively, in embodiments of the present application, the network device can be one or more (for example, two or more), depending on the specific examples. In the following embodiments, the terminal device and the network device are taken as examples for description.

[0094] FIG. 4 is a schematic diagram of a system architecture suitable for embodiments of the present application. The system architecture shown in FIG. 4 is suitable for the method 300. In the system architecture, the base station device 1 and the base station device 2 work in different frequency bands. For example, the base station device 1 works in a frequency band 1, and the base station device 2 works in a frequency band 2. As an example, the base station device 1 works in a low frequency band, such as a sub 6GHz corresponding frequency band, and the base station device 2 works in a high frequency band, such as a millimeter wave frequency band. The base station device 2 does not have or close the downlink function. The UE does not support the downlink function of the frequency band of the base station device 2 on the hardware. The uplink signal sent by the UE takes the positioning SRS as an example. The UE accesses the wireless network from the low frequency band, and the data transmission function and the control plane function of the positioning are also carried in the low frequency band.

[0095] 310. The terminal device sends one or more uplink signals to the second network device based on the first transmission time.

[0096] wherein there is no downlink between the terminal device and the second network device.

[0097] In the embodiments of the present application, the first transmission time point refers to a time point at which the terminal device transmits an uplink signal to the second network device, which can be a time point at which the uplink signal is transmitted for the first time or a time point at which the uplink signal is transmitted for any time after the first time.

[0098] If the first transmission time point is a time point at which the terminal device transmits the uplink signal for the first time, the first transmission time point can be determined based on the timing of the first network device, as follows.

[0099] Solution 1

[0100] The first transmission time point is aligned with the timing of the first network device, and the timing of the first network device is that the timing of the first network device is advanced by half of the timing advance TA of the first network device based on the downlink timing of the first network device.

[0101] It should be understood that, as in the above solution 2, the first network device and the second network device are time-synchronized, and therefore, the first transmission time point is aligned with the timing of the first network device, that is, the first transmission time point is aligned with the timing of the network side, or in other words, the first transmission time point is aligned with the timing of the base station.

[0102] FIG. 5 is an example of determining a transmission time point at which an uplink signal is transmitted for the first time, provided by the present application. As shown in FIG. 5, the UE can obtain the timing of the base station (as described above, it can also be said that the timing of the network side) by advancing half of the TA of the base station device 1 based on the downlink timing of the base station device 1, and the UE transmits the positioning SRS by aligning with the timing of the base station, that is, the TA of the base station device 2 is half of the TA of the base station device 1, so that the positioning SRS reaches the base station device 2 after the timing of the base station. At this time, the maximum coverage distance supported by the base station device 2 is the time length T CP of the cyclic prefix of the base station device 2, which is the product of the speed of light. In this example, if the subcarrier spacing of the base station device 2 is 120 KHz, T CPThe maximum coverage distance of the base station device 2 is about 177 meters. In FIG. 5, the low frequency corresponds to the base station device 1, and the high frequency corresponds to the base station device 2. It can be seen that the base station timing can be determined based on the downlink timing of the base station device 1, and then the UE aligns the base station timing to send the uplink signal to the base station device 2. The base station timing can be understood as the starting time of the base station receiving each uplink frame or sending each downlink frame. It should be understood that in this application, the TA of the base station device 1 refers to the TA used by the UE to send the uplink signal to the base station device 1. Similarly, the TA of the base station device 2 refers to the TA used by the UE to send the uplink signal to the base station device 2. Since the UE is in different positions when sending the uplink signal to the same base station device, the TA is also different. Therefore, the TA of the base station device 1 and the TA of the base station device 2 in this embodiment are both for one uplink transmission of the UE. In addition, the TA of the base station device 1 and the TA of the base station device 2 can be the TA used by the UE to send the uplink signal to the base station device 1 and the base station device 2 respectively when the UE is in the same position.

[0103] Considering that the TA of the base station device 1 may be larger due to measurement errors and other factors, in order to ensure that the positioning SRS reaches the base station device 2 after the base station timing, the TA of the positioning SRS is reduced by half of the TA adjustment granularity of the base station device 1 based on half of the TA of the base station device 1. Assuming that half of the TA adjustment granularity of the base station device 1 is denoted as e, at this time, the maximum coverage distance of the base station device 2 is (T CP -e) times the speed of light. Wherein, T CP represents the duration of the cyclic prefix (CP). In this example, if the subcarrier spacing of the base station device 1 is 30KHz, e is about 130ns, and the maximum coverage distance of the base station device 2 is about 138 meters.

[0104] Scheme 2

[0105] The above-mentioned scheme 1 describes how the UE determines the transmission time when first sending the uplink signal to the second network device (i.e., the base station device 2) from the time domain. Scheme 2 is about the transmission manner of the uplink signal in the frequency domain on the basis of scheme 1. In scheme 2, the time domain repetition property of the positioning SRS can be used to equivalently lengthen the CP of the uplink signal sent by the UE. The lengthened CP is referred to as the equivalent CP in the embodiments of the present application. Scheme 2 can increase the maximum coverage distance of the second network device and increase the coverage range of the first uplink signal transmission.

[0106] Specifically, in the scheme 2, in the frequency domain, the UE transmits the uplink signal on one of every M subcarriers, so that in the time domain, the data segment within one time domain symbol presents M periods. The equivalent CP of the uplink signal includes the CP corresponding to the base station device 2 and the time length of the first period of the M periods corresponding to the data segment within one time domain symbol. The effective data of the uplink signal is the time length of the remaining M-1 periods except the first period of the M periods, and M is a positive integer.

[0107] FIG. 6 is an example of comb-like transmission of the uplink signal in the frequency domain provided by the present application. As shown in FIG. 6, in the frequency domain, if the UE transmits the positioning SRS on one of every 4 subcarriers, in the time domain, the data segment within one symbol presents 4 periods. The first period of the data segment is added to the CP to form an equivalent CP, and the time length of the equivalent CP is denoted as T CP_EQ At this time, the maximum coverage distance of the base station device 2 is T CP_EQ times the speed of light, or (T CP_EQ e) times the speed of light, where e is half of the TA adjustment granularity of the base station device 1, see the description in the scheme 1. As an example, if T CP_EQ is about 2.67us, the maximum coverage distance of the base station device 2 is about 801 meters or 762 meters.

[0108] In the examples of the scheme 1 or the scheme 2, the uplink signal transmitted by the terminal device is taken as the positioning SRS as an example. The above-mentioned scheme 1 or scheme 2 is also applicable to other uplink signals or uplink channels that can support TA measurement by the network side device, without limitation.

[0109] Correspondingly, the second network device measures at least one uplink signal from the terminal device to obtain a TA. The second network device indicates the TA obtained by measurement to the first network device. Optionally, the second network device can be multiple, without limitation.

[0110] 320, the first network device obtains information of the TA obtained by the second network device through measurement on the at least one uplink signal.

[0111] 330, the first network device determines a timing adjustment amount according to the information of the TA obtained from the second network device.

[0112] In combination with the measurement of the at least one uplink signal by the second network device in the step 310, it can be known that the timing adjustment amount is determined by the first network device based on the TA obtained by measurement of the second network device. Optionally, if there are multiple second network devices, each second network device indicates the TA obtained by measurement to the first network device. The first network device comprehensively determines the timing adjustment amount based on multiple TAs obtained from all second network devices.

[0113] 340、The first network device sends first information to the terminal device, the first information indicating a timing adjustment amount, the timing adjustment amount being determined based on at least one of the one or more uplink signals.

[0114] The terminal device receives the first information from the first network device.

[0115] 350、The terminal device adjusts the first transmission time based on the timing adjustment amount.

[0116] The second network device can measure the positioning SRS after receiving the first positioning SRS to obtain the TA. The first network device obtains the TA measured by the second network device, and then dynamically adjusts the subsequent TA to realize closed-loop adjustment of the TA. In this way, the second network device can correctly receive the uplink signal sent by the terminal device.

[0117] The method 300 is exemplified below in combination with Example 1 and Example 3.

[0118] Example 1

[0119] The base station device 1 and the base station device 2 work in different frequencies. The base station device 2 does not have or has closed down the downlink function, and the UE does not support the downlink function of the frequency band of the base station device 2 in hardware. In Example 1, the uplink signal takes the positioning SRS as an example.

[0120] The base station device 1 corresponds to a low-frequency frequency band, for example, an FR1 frequency band, and the base station device 2 corresponds to a high-frequency frequency band, for example, an FR2 frequency band (or a millimeter wave frequency band). The UE sends a 400MHz wide positioning SRS in the high-frequency frequency band, for example, the millimeter wave frequency band, and sends a 20MHz wide positioning SRS in the low-frequency frequency band, for example, the sub-6GHz frequency band, for an eRedcap terminal. In addition, the specification of the UE in the frequency band of the base station device 1 is not limited. In other embodiments, the UE can be a Redcap terminal, an MBB terminal, or a terminal of other specifications. The UE accesses the wireless network from the sub-6GHz frequency band, and the data transmission function and the control plane function of the positioning are also carried in the sub-6GHz frequency band.

[0121] It should be understood that eRedcap is based on the concept of RedCap (reduced capability) and is a technology designed to further reduce data rates and terminal costs. RedCap, which means "reduced capability", is a technical standard protocol proposed for 5G application scenarios with low rate and low latency requirements, aiming to comprehensively improve the quality and coverage of 5G networks, and can also be understood as "lightweight 5G". The implementation of eRedcap UE (user equipment) is based on RedCap UE, and by further reducing the data rate (generally not more than 10 Mbps) and reducing the terminal cost requirements, the needs of specific application scenarios are met.

[0122] The base station device 2 in the millimeter wave frequency band receives the positioning SRS and performs positioning-related measurements.

[0123] In this example, the base station device 2 has no downlink synchronization signal, so the UE cannot synchronize with the downlink of the base station device 2. There is no downlink between the base station device 2 and the UE, and the base station device 2 also cannot directly issue an uplink timing advance command (TAC).

[0124] In the scheme provided in the present application, overall, the UE transmits the positioning SRS in the millimeter wave frequency band based on the downlink timing of the base station device 1. The complete scheme includes determining the time of first transmitting the positioning SRS and subsequent TA closed-loop adjustment.

[0125] The time of first transmitting the positioning SRS can refer to the above-mentioned scheme 1. The process of subsequent TA closed-loop adjustment will be described below in conjunction with FIG. 7.

[0126] FIG. 7 is a schematic diagram of TA closed-loop adjustment provided in the present application.

[0127] 701. The UE transmits the high-frequency positioning SRS based on the latest effective TA.

[0128] It should be understood that the high-frequency positioning SRS can refer to the terminal device transmitting the positioning SRS to the base station device 2 corresponding to the millimeter wave frequency band. The "latest effective TA" refers to the TA determined after adjusting the first transmission time based on the timing adjustment amount, which can be the TA of the terminal device when transmitting the positioning SRS in the high-frequency frequency band.

[0129] 702. The base station device 1 acquires the TA obtained by the base station device 2 measuring the high-frequency positioning SRS.

[0130] As an example, after the base station device 2 measures the TA of the high-frequency positioning SRS, the base station device 2 sends the measured TA to the base station device 1; or, the base station device 1 actively requests the measurement result of the TA from the base station device 2. The message between the base station device 1 and the base station device 2 can be an internal message of the base station or Xn interface signaling between base stations.

[0131] It should be noted that if there are multiple base station devices 2, the base station device 1 needs to integrate the measurement results of all the base station devices 2 to determine the final TA adjustment amount.

[0132] 703、The base station device 1 issues a TAC command to the UE, and the TAC command indicates the TA adjustment amount determined by the base station device 1.

[0133] Optionally, the TA adjustment amount supports both relative adjustment and absolute adjustment, and the UE implements the TA according to the TAC command.

[0134] As an example, in the RRC_INACTIVE state, the base station device 1 carries the TAC command in the paging message (or paging signaling). In addition, the position and data type of the TAC command in the paging message are not limited.

[0135] In another example, in the RRC_CONNECTED state, the base station device 1 can issue the TAC command through a media / medium access control-control element (MAC CE). As an example, the content of the MAC CE is shown in FIG. 8.

[0136] FIG. 8 is a schematic diagram of indicating the TAC of the high-frequency positioning SRS through the MAC CE according to the present application. As shown in FIG. 8, the value of Flg is 0, indicating cumulative adjustment, and the high 6 bits of TAC are valid; the value of Flg is 1, indicating absolute adjustment, and TAC needs 12 bits.

[0137] Example 2

[0138] The network architecture of this example can be as shown in FIG. 4. The base station device 1 and the base station device 2 work in different frequency bands. The base station device 2 does not support or turn off the downlink function in hardware.

[0139] In one example, when there is only one uplink signal (or uplink channel) between the UE and the base station device 2, and the uplink signal can be used for TA measurement, for example, the uplink signal is SRS, the scheme 1 about the first transmission time in Example 1 and the TA closed-loop adjustment can be used in combination to determine the transmission time of the uplink signal sent by the UE to the base station device 2.

[0140] In another example, when there is only one uplink signal (or uplink channel) between the UE and the base station device 2, and the uplink signal can be used for TA measurement, and the uplink signal supports frequency domain comb transmission, for example, the uplink signal is SRS, the scheme 1 or the scheme 2 in the first example about the first transmission time point is applicable, and in addition, in combination with the TA closed loop adjustment, the transmission time point of the uplink signal transmitted by the UE to the base station device 2 can be determined.

[0141] In another example, when there are multiple uplink signals between the UE and the base station device 2, and at least one of the uplink signals can be used for TA measurement, for example, the at least one of the uplink signals is one or more of PUSCH, PUCCH, SRS, positioning SRS, the scheme 1 in the first example about the first transmission time point and the TA closed loop adjustment can be used in combination. Moreover, if there are multiple uplink signals that can be used for TA measurement, one or more of them can be selected for TA measurement, for example, one or more of physical uplink shared channel (PUSCH) demodulation reference signal (DMRS), physical uplink control channel (PUCCH) DMRS, SRS, or positioning SRS, etc.

[0142] In another example, when there are multiple uplink signals between the UE and the base station device 2, and at least one of the uplink signals can be used for TA measurement, and the multiple uplink signals all support the same frequency domain comb transmission, the at least one of the uplink signals can include one or more of SRS, positioning SRS, the scheme 1 or the scheme 2 in the first example and the TA closed loop adjustment can be used in combination. Alternatively, if there are multiple uplink signals that can be used for TA measurement, one or more of them can be selected for TA measurement, for example, one or more of SRS, positioning SRS is selected.

[0143] In the above embodiments, the uplink signal can also refer to the uplink channel. For example, if there is one uplink signal between the UE and the base station device 2, the one uplink signal can also be a certain uplink channel; if there are multiple uplink signals between the UE and the base station device 2, each of the multiple uplink signals can be an uplink signal or an uplink channel; or part of the uplink signal and part of the uplink channel. The description is also applicable to other embodiments, which will not be repeated here.

[0144] Example 3

[0145] FIG. 9 is a schematic diagram of a system architecture suitable for the embodiments of the present application. The base station device 1 and the base station device 2 operate in the same frequency band, and there is no downlink between the base station device 2 and the UE. The base station device 2 does not support or turn off the downlink function in hardware. In this example, it does not matter whether the base station device 1 receives the uplink channel or the uplink signal between the UE and the base station device 2. In other words, the base station device 1 can receive the uplink signal or the uplink signal between the UE and the base station device 2, or the base station device 1 can not receive the uplink signal or the uplink signal between the UE and the base station device 2.

[0146] The scheme for determining the transmission timing of the uplink signal in Example 1, such as Scheme 1 or Scheme 2 in combination with the TA closed-loop adjustment scheme, can also be applied to the present example.

[0147] The above FIGS. 3-9 can be applied to the scenario of how to determine and control the transmission timing of the uplink signal when the second network device receives the uplink signal of the terminal device. The following describes a method for determining and controlling the transmission timing of the uplink signal in the scenario of how the first network device and the second network device both receive the uplink signal of the terminal device in combination with FIG. 10.

[0148] FIG. 10 is a schematic flowchart of a communication method 900 provided by the present application. The method 900 can be implemented by a terminal device or an apparatus (such as a chip, a processor, or a circuit, etc.) applied to the terminal device, and a network device or an apparatus (such as a chip, a processor, or a circuit, etc.) applied to the network device to perform the corresponding steps. Alternatively, in the embodiments of the present application, the network device can be multiple (which can mean two or more). The following embodiments are described by taking the terminal device and the network device as examples.

[0149] The system architecture suitable for the method 900 can be referred to FIG. 9, which will not be described again.

[0150] 910. The terminal device transmits a first uplink signal.

[0151] The first network device and the second network device respectively measure the first uplink signal, and correspondingly obtain a first measurement result and a second measurement result. That is, the first measurement result and the second measurement result are obtained by the first network device and the second network device measuring the first uplink signal, respectively. The first measurement result or the second measurement result can include a timing advance TA and / or a signal reception strength.

[0152] 920. The first network device acquires the second measurement result corresponding to the second network device.

[0153] 930. The first network device determines a timing adjustment amount based on the second measurement result and the first measurement result.

[0154] 940、The first network device sends first information to the terminal device, the first information indicating the timing adjustment amount.

[0155] For the sake of simplicity in description, the TA and signal reception strength determined by the first network device measuring the first uplink signal are denoted as first TA (or TA1) and first signal reception strength, respectively; the TA and signal reception strength determined by the second network device measuring the first uplink signal are denoted as second TA (or TA2) and second signal reception strength, respectively. Taking the signal reception strength as an example of RSRP, the first signal reception strength can be denoted as RSRP1, and the second signal reception strength can be denoted as RSRP2.

[0156] The timing adjustment amount can be determined based on the TA or signal reception strength obtained by the first network device and the second network device measuring, respectively, or based on the TA and signal reception strength.

[0157] As an example, the timing adjustment amount is determined based on the TA:

[0158] 1) If TA1>TA2+threshold, the timing adjustment amount is determined as TA2. In this implementation, the uplink signal of the UE, for example, a subsequent second uplink signal, is received by the second network device;

[0159] 2) If TA2>TA1+threshold, the timing adjustment amount is determined as TA1. In this implementation, the uplink signal of the UE, for example, a subsequent second uplink signal, is received by the first network device; or,

[0160] 3) For other cases except 1) and 2) above, the timing adjustment amount is determined as TA3, which is a value between TA1 and TA2. In this implementation, the uplink signal of the UE, for example, a subsequent second uplink signal, is received by both the first network device and the second network device.

[0161] As another example, the timing adjustment amount can be determined based on the reception strength (or reception quality) of the uplink signal, for example, the RSRP, signal to interference plus noise ratio (SINR) or the like of the uplink signal. For example:

[0162] 1) If RSRP1>RSRP2+threshold, the TA adjustment amount of the UE is determined as TA1. The uplink signal of the UE is received by the first network device;

[0163] 2) If RSRP2>RSRP1+threshold, the TA adjustment amount of the UE is determined as TA2. The uplink signal of the UE is received by the second network device; or,

[0164] 3) In other cases than the above two cases, the TA adjustment amount of the UE can be between TA1 and TA2. For the uplink signal of the UE, both the first network device and the second network device receive.

[0165] As a further example, the timing adjustment amount can be determined according to the TA and the reception strength (or reception quality) of the uplink signal. For example:

[0166] 1) If RSRP1 > RSRP2 + threshold 1, and TA2 > TA1 + threshold 2, the TA adjustment amount of the UE is determined as TA1. For the uplink signal of the UE, the first network device receives;

[0167] 2) If RSRP2 > RSRP1 + threshold 1, and TA1 > TA2 + threshold 2, the TA adjustment amount of the UE is determined as TA2. For the uplink signal of the UE, the second network device receives; or,

[0168] 3) In other cases than the above two cases, the TA adjustment amount of the UE can be between TA1 and TA2. For the uplink signal of the UE, both the first network device and the second network device receive.

[0169] In addition, the determination of the TA adjustment amount is not limited to also include other parameters in addition to the TA and / or the signal reception strength.

[0170] In the above examples, the comparison of the TA is based on one threshold, for example, threshold 1. The comparison of the RSRP is based on another threshold, for example, threshold 2. Alternatively, different thresholds can also be set for the two branches, for example, RSRP1 > RSRP2 + threshold 1, and TA2 > TA1 + threshold 2, the timing adjustment amount is determined as TA1; or, RSRP2 > RSRP1 + threshold 3, and TA1 > TA2 + threshold 4, the timing adjustment amount is determined as TA2. Or other threshold settings, not limited.

[0171] Overall, the network device receiving the uplink signal is selected as the network device closer to the UE.

[0172] 950、The terminal device sends a second uplink signal based on the timing adjustment amount.

[0173] The terminal device sends a second uplink signal based on the timing adjustment amount. Accordingly, according to the introduction in step 930, in different implementations, the first network device and / or the second network device receives the second uplink signal.

[0174] Alternatively, the above first uplink signal can be a PRACH, or an uplink signal sent by the UE after accessing the network for any time.

[0175] In the technical solution corresponding to the method 900, a method for determining TA of an uplink without a corresponding downlink is provided, and a method for receiving an uplink signal of a terminal device in different implementations is provided. In this solution, the terminal device can determine the TA of the uplink signal sent to the second network device without a corresponding downlink. In addition, in different implementations, the network side device receiving the uplink signal of the terminal device can be the first network device, or the second network device, or both the first network device and the second network device can receive, and in different scenarios, the uplink signal can have good reception performance.

[0176] The above is a detailed description of the communication method provided by the present application. The communication device provided by the present application is introduced below.

[0177] FIG. 11 is a schematic structural diagram of a communication device 1000 provided by the present application. The communication device 1000 can be a terminal device, or a device applied to a terminal device and capable of implementing the corresponding functions of the terminal device in the method embodiments of the present application, such as a chip, a processor, or a circuit, etc. Alternatively, the communication device 1000 can be a network device, or a device applied to a network device and capable of implementing the corresponding functions of the network device in the method embodiments of the present application, such as a chip, a processor, or a circuit, etc.

[0178] The communication device 1000 includes a processing module 1001, which can be a processor, a processing board, a processing unit, or a processing device, etc., configured to perform operations / processes, etc. internally implemented by the communication device 1000. Optionally, the communication device 1000 further includes a communication module 1002, which can also be referred to as a transceiver module, a transceiver, a transceiver device, etc., configured to perform receiving (or input) and / or transmitting (or output) operations.

[0179] In one implementation, the communication device 1000 can be a terminal device, or a device applied to a terminal device and capable of implementing the corresponding functions of the terminal device in the method embodiments of the present application.

[0180] In one example, the communication module is configured to:

[0181] transmit one or more uplink signals to the second network device based on the first transmission time, wherein there is no downlink between the communication device and the second network device;

[0182] receive first information from the first network device, wherein the first information indicates a timing adjustment amount, and the timing adjustment amount is determined based on at least one of the one or more uplink signals;

[0183] the processing module is configured to adjust the first transmission time based on the timing adjustment amount.

[0184] In another example, the communication module is configured to:

[0185] receive a paging message from the first network device, the paging message comprising the first information; or

[0186] receive a MAC CE signaling from the first network device, the MAC CE signaling comprising the first information.

[0187] In one example, the communication module is configured to:

[0188] send a first uplink signal;

[0189] receive first information, the first information indicating a timing adjustment amount, the timing adjustment amount being determined based on measurement results obtained by the first network device and the second network device respectively measuring the first uplink signal; and

[0190] send a second uplink signal based on the timing adjustment amount.

[0191] In one example, the measurement results comprise timing advance (TA) and / or signal reception strength.

[0192] In another implementation, the communication apparatus 1000 can be a network device, or a device applied to a network device and capable of realizing the corresponding functions of the network device in the method embodiments of the present application.

[0193] In one example, the communication module is configured to:

[0194] obtain, from a second network device, information of timing advance (TA), the TA information being obtained by the second network device measuring at least one of one or more uplink signals from a terminal device, and there being no downlink between the second network device and the terminal device;

[0195] the processing module is configured to determine a timing adjustment amount based on the TA information; and

[0196] the communication module is configured to send first information, the first information indicating the timing adjustment amount, the timing adjustment amount being used by the terminal device to adjust a first transmission time of an uplink signal sent to the second network device.

[0197] In another example, the communication module is configured to:

[0198] send a paging message, the paging message comprising the first information; or

[0199] transmit MAC CE signaling containing the first information.

[0200] In another example, the communication module and the processing module are configured to measure a first uplink signal from a terminal device to obtain a first measurement result;

[0201] The communication module is configured to obtain a second measurement result from a second network device, the second measurement result being determined by the second network device measuring the first uplink signal, and there being no downlink between the terminal device and the second network device; and

[0202] The processing module is configured to determine a timing adjustment amount based on the first measurement result and the second measurement result, the timing adjustment amount being used to adjust a transmission time of a second uplink signal transmitted by the terminal device to the second network device.

[0203] In another example, the first measurement result or the second measurement result includes the TA; and the processing module is configured to:

[0204] if a difference between the first TA and the second TA is greater than a first threshold, the timing adjustment amount is determined as the second TA; or

[0205] if a difference between the second TA and the first TA is greater than the first threshold, the timing adjustment amount is determined as the first TA.

[0206] The first TA is a TA determined by the first network device measuring the first uplink signal, and the second TA is a TA determined by the second network device measuring the first uplink signal.

[0207] In another example, the first measurement result or the second measurement result includes the signal reception strength; and the processing module is configured to:

[0208] if a difference between the first signal reception strength and the second signal reception strength is greater than a second threshold, the timing adjustment amount is determined as the first TA;

[0209] or

[0210] if a difference between the second signal reception strength and the first signal reception strength is greater than the second threshold, the timing adjustment amount is determined as the second TA;

[0211] The first signal reception strength and the first TA are obtained by the first network device measuring the first uplink signal, and the second signal reception strength and the second TA are obtained by the second network device measuring the first uplink signal.

[0212] In another example, the first measurement result or the second measurement result comprises: the TA and the signal receiving strength; and the processing module is configured to:

[0213] if the difference between the second TA and the first TA is greater than the first threshold, and the difference between the second signal receiving strength and the first signal receiving strength is greater than the second threshold, the timing adjustment quantity is the first TA; or

[0214] if the difference between the first TA and the second TA is greater than the first threshold, and the difference between the second signal receiving strength and the first signal receiving strength is greater than the second threshold, and the timing adjustment quantity is the second TA.

[0215] The first signal receiving strength and the first TA are obtained by measuring the first uplink signal by the first network device, and the second signal receiving strength and the second TA are obtained by measuring the first uplink signal by the second network device.

[0216] In addition, it needs to be explained that the foregoing communication module and / or processing module can be implemented by a virtual module, for example, the processing module can be implemented by a software function unit or a virtual device, and the communication module can be implemented by a software function or a virtual device. Alternatively, the processing module or the communication module can also be implemented by an entity device, for example, if the device is implemented by a chip / circuit (for example, an integrated circuit or a logic circuit), the communication module can be an input / output circuit and / or a communication interface, and performs an input operation (corresponding to the foregoing receiving operation) and an output operation (corresponding to the foregoing sending operation); and the processing module is an integrated processor or a microprocessor or a circuit (for example, an integrated circuit or a logic circuit).

[0217] The division of the modules in the present application is illustrative, and is only a logical function division. In actual implementation, another division mode can be used. In addition, each function module in each example in the present application can be integrated in one processor, or can be a separate physical entity, or two or more modules can be integrated in one module. The integrated module can be implemented in the form of hardware, or in the form of a software function module, or in the form of a combination of hardware and software.

[0218] Figure 12 is a schematic structural diagram of another communication apparatus provided in the present application. The communication apparatus 1100 can be used to implement the functions of any one of the communication devices (e.g., terminal device or network device) in the communication system described in the foregoing examples. The communication apparatus 1100 can include at least one processor 1110. Optionally, the processor 1110 (or processing apparatus) is coupled with a memory, which can be located within the communication apparatus, or the memory can be integrated with the processor, or the memory can also be located outside the communication apparatus. For example, the communication apparatus 1100 can further include at least one memory 1120. The memory 1120 stores computer programs, instructions or data necessary for implementing any one of the method embodiments described above; the processor 1110 can execute the computer programs, instructions or data stored in the memory 1120 to complete the corresponding functions of the terminal device or network device in any one of the embodiments described above.

[0219] Optionally, the communication apparatus 1100 can further include a communication interface 1130, and the communication apparatus 1100 can interact with other devices through the communication interface 1130. For example, the communication interface 1130 can be a transceiver, circuit, bus, module, pin or other type of communication interface. When the communication apparatus 1100 is a chip-type apparatus or circuit, the communication interface 1130 in the apparatus 1100 can also be an input / output circuit, which can input (or receive) information and / or output (or send) information; the processor can be an integrated circuit or logic circuit, etc., and the processor can determine the output information according to the input information.

[0220] The coupling in the present application is an indirect coupling or communication connection between apparatuses, units or modules, which can be electrical, mechanical or other forms, for information interaction between apparatuses, units or modules. The processor 1110 can operate in cooperation with the memory 1120 and the communication interface 1130. The connection medium between the processor 1110, the memory 1120 and the communication interface 1130 is not limited in the present application.

[0221] Figure 13 is a schematic structural diagram of a chip provided in the present application. The chip 30 includes a circuit 31 and a communication interface 32. The circuit 31 can be a logic circuit, integrated circuit, etc., and the communication interface 32 can also be referred to as an input / output circuit, input / output interface, interface circuit, etc., which can input (or receive) information or output (or send) information. The chip 30 can execute the method performed by the terminal device or network device (e.g., first network device) in the embodiments of the present application.

[0222] Further, the present application also provides a computer readable storage medium, wherein computer instructions are stored, and when the computer instructions are run on a computer, operations and / or processes performed by a terminal device or a network device (for example, a first network device) in any one of the method embodiments of the present application are performed.

[0223] The present application also provides a computer program product, which comprises computer program codes or instructions, and when the computer program codes or instructions are run on a computer, operations and / or processes performed by a terminal device or a network device (for example, a first network device) in any one of the method embodiments of the present application are performed.

[0224] Further, the present application also provides a chip, which comprises a processor. A memory for storing a computer program is arranged independently of the chip, and the processor is configured to execute the computer program stored in the memory, so that operations and / or processes performed by a terminal device or a network device (for example, a first network device) in any one of the method embodiments are performed. Further, the chip can also comprise a communication interface. The communication interface can be an input / output interface, an interface circuit, or the like. Further, the chip can also comprise the memory.

[0225] The present application provides a communication system, which comprises a terminal device and a network device in any one of the method embodiments. The network device can comprise a first network device and a second network device, and the second network device can be one or more, without limitation.

[0226] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described system, device and unit can refer to the corresponding processes in the foregoing method embodiments, which will not be described herein.

[0227] In the embodiments of the present application, "indication" can include direct indication, indirect indication, explicit indication, and implicit indication. When it is described that certain indication information is used to indicate A, it can be understood that the indication information carries A, which can be direct indication of A or indirect indication of A. Indirect indication can mean that the indication information directly indicates B, and a corresponding relationship between B and A is used to achieve the purpose of indicating A through the indication information. The corresponding relationship between B and A can be pre-defined by a protocol, pre-stored, or obtained through configuration between network elements.

[0228] The processor in the embodiments of the present application has signal processing capability, and can be a central processing unit (CPU), and can also be a general processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, and can implement or execute the disclosed methods, steps and logic block diagrams in the present application. The general processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the present application can be directly embodied as hardware processor execution, or executed by a combination of hardware and software modules in the processor. The software module can be located in a random memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register or other mature storage medium in the art. The storage medium is located in the memory, and the processor reads the information in the memory, and combines the hardware to complete the steps of the above method.

[0229] In embodiments of the application, the memory can be volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. By way of illustration, and not limitation, nonvolatile memory can be read-only memory (ROM), programmable ROM (PROM), erasable PROM (EPROM), electrically EPROM (EEPROM), or flash memory. Volatile memory can be random access memory (RAM), which acts as external cache. By way of illustration and not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double-data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), Synchlink DRAM (SLDRAM), and direct rambus RAM (DR RAM). It is to be noted that the system and method described herein are intended to include all types of memory, and are not limited to the types of memory described herein.

[0230] The technical solutions provided in the present application can be realized by software, hardware, firmware or any combination thereof, in whole or in part. When realized by software, the technical solutions can be realized in the form of a computer program product in whole or in part. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the present application are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a terminal device, an access network device or other programmable devices. 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 through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) mode. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. integrated with one or more available media. The available media can be magnetic media (such as floppy disk, hard disk, magnetic tape), optical media (such as digital video disc (DVD)), or semiconductor media, etc.

[0231] At least one (item) involved in the embodiments of the present application means one (item) or more (items). More (items) means two (items) or more than two (items). "And / or" is used to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone.

[0232] The term "comprising" mentioned in the embodiments of the present application and any variation thereof is intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but optionally includes other steps or units not listed, or optionally includes other steps or units inherent to the process, method, product or device.

[0233] In the present application, the methods and / or terms between the method embodiments can be mutually referred to each other without logical contradiction, for example, the functions and / or terms between the device embodiments can be mutually referred to each other, for example, the functions and / or terms between the device examples and the method examples can be mutually referred to each other.

[0234] Those skilled in the art can appreciate that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solutions. Those skilled in the art can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0235] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the device embodiments described above are only schematic. The division of the units is only a logical function division. In actual implementation, there can be another division manner. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or other forms.

[0236] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, i.e. can be located in one place or distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0237] In addition, each functional unit in each embodiment of the present application can be integrated into a processing unit, or each unit can exist physically, or two or more units can be integrated into one unit.

[0238] If the functions are realized in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application essentially or the parts that make contributions to the prior art or parts of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0239] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A communication method characterized by comprising: Applied to a terminal device, comprising: sending one or more uplink signals to a second network device based on a first transmission time, no downlink between the terminal device and the second network device; receiving first information from a first network device, the first information indicating a timing adjustment amount, the timing adjustment amount being determined based on at least one of the one or more uplink signals; adjusting the first transmission time based on the timing adjustment amount.

2. The method of claim 1, wherein, The first transmission time is the transmission time when the terminal device first sends the one or more uplink signals, and the first transmission time is determined based on the timing of the first network device.

3. The method of claim 2, wherein, The first transmission time is determined based on the timing of the first network device, comprising: The first transmission time and the timing of the first network device are aligned, and the timing of the first network device is based on the downlink timing of the first network device, and the timing of the first network device is advanced by half of the timing advance TA.

4. The method of claim 3, wherein, In the frequency domain, each of the one or more uplink signals is transmitted on one of every M subcarriers, and in the time domain, each of the one or more uplink signals includes an equivalent cyclic prefix CP and valid data, the equivalent CP includes a cyclic prefix CP corresponding to the second network device and a time length of the first period of M periods corresponding to a data segment within one time domain symbol, and the time length of the valid data includes the time length of the remaining M-1 periods except the first period in the M periods, M being a positive integer.

5. The method according to any one of claims 1 to 4, characterized in that, The receiving first information from the first network device comprises: receiving a paging message from the first network device, the paging message containing the first information; or receiving a MAC CE signaling from the first network device, the MAC CE signaling containing the first information.

6. The method according to any one of claims 1 to 5, characterized in that, The first network device and the second network device work in different frequency bands, or the first network device and the second network device work in the same frequency band.

7. A communication method characterized by comprising: Applied to a terminal device, comprising: sending a first uplink signal; receiving first information, the first information indicating a timing adjustment amount, the timing adjustment amount being determined based on measurement results obtained by the first network device and the second network device respectively measuring the first uplink signal; sending a second uplink signal based on the timing adjustment amount.

8. The method of claim 7, wherein, The measurement results include timing advance TA and / or signal reception strength.

9. The method of claim 8, wherein, The measurement results include the TA; And the timing adjustment amount is determined based on the measurement results obtained by the first network device and the second network device respectively measuring the uplink signal, comprising: If the difference between the first TA and the second TA is greater than the first threshold, the timing adjustment amount is the second TA; If the difference between the second TA and the first TA is greater than the first threshold, the timing adjustment amount is the first TA; Wherein, the first TA is the TA determined by the first network device measuring the first uplink signal, and the second TA is the TA determined by the second network device measuring the first uplink signal.

10. The method of claim 8, wherein, The measurement result comprises the signal receiving strength; and The timing adjustment amount is determined based on measurement results obtained by the first network device and the second network device respectively measuring the uplink signal, comprising: If the difference between the first signal receiving strength and the second signal receiving strength is greater than a second threshold, the timing adjustment amount is the first TA; or If the difference between the second signal receiving strength and the first signal receiving strength is greater than a second threshold, the timing adjustment amount is the second TA. The first signal receiving strength and the first TA are obtained by the first network device measuring the first uplink signal, and the second signal receiving strength and the second TA are obtained by the second network device measuring the first uplink signal.

11. The method of claim 8, wherein, The measurement result comprises the TA and the signal receiving strength; The timing adjustment amount is determined based on measurement results obtained by the first network device and the second network device respectively measuring the uplink signal, comprising: If the difference between the second TA and the first TA is greater than a first threshold, and the difference between the first signal receiving strength and the second signal receiving strength is greater than a second threshold, the timing adjustment amount is the first TA; or If the difference between the first TA and the second TA is greater than a first threshold, and the difference between the second signal receiving strength and the first signal receiving strength is greater than a second threshold, the timing adjustment amount is the second TA. The first signal receiving strength and the first TA are obtained by the first network device measuring the first uplink signal, and the second signal receiving strength and the second TA are obtained by the second network device measuring the first uplink signal.

12. A communication method, comprising: Applied to a first network device, comprising: Obtaining timing advance (TA) information from a second network device, the TA information being obtained by the second network device measuring at least one uplink signal from one or more uplink signals of a terminal device, and there being no downlink between the second network device and the terminal device; Determining a timing adjustment amount based on the TA information; Sending first information, the first information indicating the timing adjustment amount, the timing adjustment amount being used for the terminal device to adjust a first transmission time of an uplink signal sent to the second network device.

13. The method of claim 12, wherein, The first transmission time is a transmission time at which the terminal device first transmits the one or more uplink signals, and the first transmission time is determined based on timing of the first network device.

14. The method of claim 12, wherein, The first transmission time is determined based on timing of the first network device, comprising: The first transmission time is aligned with the timing of the first network device, and the timing of the first network device is based on downlink timing of the first network device and is advanced by half of the TA of the first network device.

15. The method of claim 14, wherein, In the frequency domain, each of the one or more uplink signals is transmitted on one of every M subcarriers, and in the time domain, each of the one or more uplink signals comprises an equivalent cyclic prefix (CP) and valid data, the equivalent CP comprising a cyclic prefix CP corresponding to the second network device and a time length of a first period of M periods corresponding to a data segment within one time domain symbol, and a time length of the valid data comprising time lengths of the remaining M-1 periods of the M periods other than the first period, M being a positive integer.

16. The method according to any one of claims 12 to 15, characterized in that, The sending of the first information comprises: sending a paging message, the paging message containing the first information; or sending MAC CE signaling, the MAC CE signaling containing the first information.

17. The method according to any one of claims 12 to 16, characterized in that, The first network device and the second network device operate in different frequency bands, or the first network device and the second network device operate in the same frequency band.

18. A method of communication, comprising: The method applied to the first network device comprises: measuring a first uplink signal from a terminal device to obtain a first measurement result; obtaining a second measurement result from a second network device, the second measurement result being determined by the second network device measuring the first uplink signal, and there being no downlink between the terminal device and the second network device; based on the first measurement result and the second measurement result, determining a timing adjustment amount, the timing adjustment amount being used to adjust a transmission time of a second uplink signal sent by the terminal device to the second network device.

19. The method of claim 18, wherein, The first measurement result or the second measurement result comprises a timing advance (TA) and / or a signal reception strength.

20. The method of claim 19, wherein, The first measurement result or the second measurement result comprises the TA. The determination of the timing adjustment amount based on the first measurement result and the second measurement result comprises: if a difference between the first TA and the second TA is greater than a first threshold, the timing adjustment amount is determined as the second TA; or if a difference between the second TA and the first TA is greater than the first threshold, the timing adjustment amount is determined as the first TA. The first TA is a TA determined by the first network device measuring the first uplink signal, and the second TA is a TA determined by the second network device measuring the first uplink signal.

21. The method of claim 19, wherein, The first measurement result or the second measurement result comprises the signal reception strength. The determination of the timing adjustment amount based on the first measurement result and the second measurement result comprises: if a difference between the first signal reception strength and the second signal reception strength is greater than a second threshold, the timing adjustment amount is determined as the first TA; or if a difference between the second signal reception strength and the first signal reception strength is greater than the second threshold, the timing adjustment amount is determined as the second TA. The first signal reception strength and the first TA are obtained by the first network device measuring the first uplink signal, and the second signal reception strength and the second TA are obtained by the second network device measuring the first uplink signal. The first measurement result or the second measurement result comprises the TA and the signal reception strength.

22. The method of claim 19, wherein, ​ The determining the timing adjustment amount based on the first measurement result and the second measurement result comprises: if a difference between the second TA and the first TA is greater than a first threshold, and a difference between the second signal receiving strength and the first signal receiving strength is greater than a second threshold, determining the timing adjustment amount as the first TA; or if a difference between the first TA and the second TA is greater than the first threshold, and a difference between the second signal receiving strength and the first signal receiving strength is greater than the second threshold, determining the timing adjustment amount as the second TA. The first signal receiving strength and the first TA are obtained by the first network device measuring the first uplink signal, and the second signal receiving strength and the second TA are obtained by the second network device measuring the first uplink signal.

23. A communications device, characterized by The apparatus comprises a module or unit for performing the method of any one of claims 1-22.

24. A communications device, characterized by The apparatus comprises a communication interface and a circuit, the communication interface is configured to acquire information required for performing the method of any one of claims 1-11, and send the information to the circuit, the circuit is configured to perform the method of any one of claims 1-11 based on the received information; or The communication interface is configured to acquire information required for performing the method of any one of claims 12-22, and send the information to the circuit, the circuit is configured to perform the method of any one of claims 12-22 based on the received information.

25. A communications device, characterized by The apparatus comprises a processor coupled to a memory, the processor is configured to execute computer programs or instructions stored in the memory, so that the communication device performs the method of any one of claims 1-11, or performs the method of any one of claims 12-22.

26. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer instructions, when the computer instructions run on a computer, the method of any one of claims 1-11 is implemented, or the method of any one of claims 12-22 is implemented.

27. A computer program product, characterised in that, The computer program product comprises computer program codes or instructions, when the computer program codes or instructions run on a computer, the method of any one of claims 1-11 is implemented, or the method of any one of claims 12-22 is implemented.

28. A wireless communication system, characterized by The apparatus comprises at least two communication devices, the communication devices are configured to perform the method of any one of claims 1-11, or the method of any one of claims 12-22.

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