CN116647906A

CN116647906A - Communication method and device

Info

Publication number: CN116647906A
Application number: CN202210136472.4A
Authority: CN
Inventors: 侯利明; 康绍莉
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2022-02-15
Filing date: 2022-02-15
Publication date: 2023-08-25
Also published as: WO2023155478A1

Abstract

The application provides a communication method and a communication device, relates to the technical field of communication, and is used for providing a mechanism for realizing timing synchronization of network equipment and terminal equipment. In the communication method, the terminal device may determine a plurality of reception times for receiving a plurality of first signals from the network device, determine a first parameter indicating a relative value of an interval between the plurality of reception times and an interval between the plurality of transmission times of the first signals according to the plurality of reception times and a transmission period for transmitting the first signals by the network device, and adjust a timing advance based on the first parameter to maintain timing synchronization of the network device and the terminal device.

Description

Communication method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a communications method and apparatus.

Background

The satellite communication system comprises a base station and a terminal device. The terminal device may communicate directly with the base station, or the terminal device may communicate with the base station via a satellite. This results in difficulty in maintaining timing synchronization between the base station and the terminal device in the satellite communication system, since the transmission distance between the terminal device and the base station is long and the operation speed of the satellite is high. However, there is no corresponding solution for realizing timing synchronization between a base station and a terminal device in a satellite communication system.

Disclosure of Invention

The embodiment of the application provides a communication method and a communication device, which are used for realizing timing synchronization between network equipment and terminal equipment in a satellite communication system.

In a first aspect, an embodiment of the present application provides a communication method, which is applied to a terminal device of a satellite communication system, where the method includes: determining a plurality of receiving times for receiving a plurality of first signals from a network device, wherein one of the first signals corresponds to one of the receiving times, and the sending period of the network device for sending the first signals to the terminal device is a first duration; determining a first parameter according to the plurality of receiving times and the first duration, wherein the first parameter is used for representing a relative value between intervals of the plurality of receiving times and intervals of the plurality of first signals; and adjusting the timing advance according to the first parameter.

In the embodiment of the application, the terminal equipment can determine a plurality of receiving times for receiving a plurality of first signals from the network equipment, and calculate the first parameter for representing the timing deviation between the terminal equipment and the network equipment according to the plurality of receiving times and the sending period of the first signals sent by the network equipment, and further adjust the timing advance according to the first parameter so as to realize the timing synchronization between the network equipment and the terminal equipment. Also, a mechanism is provided for determining a relative deviation in time between a terminal device and a network device.

In one possible embodiment, the method further comprises: transmitting first information to the network device, wherein the first information is used for indicating the first parameter; receiving second information, where the second information is used to indicate a second duration, where the second duration is the adjusted sending period, and the second duration is determined according to the first parameter, where the second duration is inversely related to the value of the first parameter.

In the embodiment of the application, the terminal equipment can send the first parameter to the network equipment, so that the network equipment can adjust the sending period of the first signal based on the first parameter, which is beneficial for the network equipment to more reasonably set the sending period of the first signal.

In one possible implementation manner, the second duration is a duration corresponding to a first value range, where the first value range is a value range to which a relative speed of the terminal device with respect to a satellite belongs, and the larger a minimum value in the first value range is, the smaller a duration corresponding to the first value range is, and the satellite corresponds to the terminal device.

In the embodiment of the application, the second duration is related to the relative speed of the terminal equipment relative to the satellite, if the relative speed of the terminal equipment relative to the satellite is larger, the relative speed between the terminal equipment and the satellite is indicated to be larger, and in this case, the value of the second duration can be smaller, so that the terminal equipment can improve the accuracy of determining the first parameter, and the accuracy of adjusting the timing advance by the terminal equipment is improved.

In a possible implementation manner, the second time period is greater than or equal to a value of a minimum configuration period, where the minimum configuration period is determined by a maximum relative speed of the terminal device with respect to a satellite, and a cyclic prefix length corresponding to the terminal device, and the satellite corresponds to the terminal device; and/or the second duration is smaller than or equal to a value of a maximum configuration period, the maximum configuration period is determined under the constraint of a first preset condition, the first preset condition is that under the condition that the sending period is the maximum configuration period, a timing variation is smaller than half of the cyclic prefix length, and the timing variation is used for representing a deviation amount of an interval between receiving times of any two adjacent first signals relative to an interval between sending times of the any two adjacent first signals.

In this embodiment, the second time period may be defined between the minimum configuration period and the maximum configuration period to more reasonably set the second time period.

In one possible embodiment, the method further comprises: and determining that the first parameter meets a second preset condition.

In this embodiment, the terminal device may send the first information to the network device when it is determined that the first parameter meets the second preset condition, so that on the basis of ensuring that the network device can reasonably set a sending period of the first signal based on the first parameter, the number of times that the terminal device sends the first signal to the network device can be relatively reduced, and signaling overhead is saved.

In a possible implementation manner, the first information includes N bits, wherein a part of bits in the N bits represent positive and negative of the first parameter, another part of bits in the N bits represent a value of the first parameter, and N is an integer greater than 1; and/or, the first information includes M bits, where M bits represent a second value range to which the value of the first parameter belongs, and M is a positive integer.

In this embodiment, the first signal may specifically indicate the value of the first parameter, or may specifically indicate the value range to which the first parameter belongs, and various manners of indicating the first parameter by the first signal are provided.

In one possible implementation, determining the first parameter according to the plurality of reception times and the first duration includes: determining an interval between each adjacent two of the plurality of receive times; and determining the first parameter according to the determined interval and the first duration.

In this embodiment, a way of determining the first parameter is provided. When the first parameter is determined, the interval between every two adjacent receiving times is considered, so that the error of part of the receiving time can be reduced, the influence on the determination result of the first parameter is reduced, and the reliability of determining the first parameter is improved.

In one possible implementation, determining the first parameter according to the plurality of reception times and the first duration includes: determining an interval between a first reception time and each of the plurality of reception times, respectively, the first reception time being one of the plurality of reception times; and determining the first parameter according to the determined interval and the first duration.

In this embodiment, a way of determining the first parameter is provided. When the first parameter is determined, the intervals between the first receiving time and the plurality of receiving times are considered, so that the error of part of the receiving time can be reduced, the influence on the determination result of the first parameter is reduced, and the reliability of determining the first parameter is improved.

In one possible implementation, adjusting the timing advance according to the first parameter includes: and weighting the pre-configured timing advance according to the first parameter to obtain the adjusted timing advance.

In this embodiment, a manner of adjusting the timing advance is provided, in which the timing advance preconfigured by the terminal device is weighted based on the first parameter, and the adjustment manner is simple.

In one possible implementation, adjusting the timing advance according to the first parameter further includes: receiving third information from the network device, the third information being used to indicate an adjustment value; and adjusting the adjusted timing advance according to the adjustment value.

In this embodiment, if the network device supports closed loop control, the network device may further instruct the terminal device to readjust the adjusted timing advance. Further, the network device may send the third information to the terminal device when the adjustment value is determined to be greater than the first threshold, which is beneficial to reducing the number of times the network device sends the third information to the terminal device, and saving signaling overhead.

In a second aspect, an embodiment of the present application provides a communication method, applied to a network device of a satellite communication system, where the method includes: and receiving first information, wherein the first information is used for indicating a first parameter, the first parameter is used for representing a relative value between intervals of a plurality of receiving times of a plurality of first signals and intervals of transmitting times of the plurality of first signals, the first parameter is determined according to the plurality of receiving times and a first time length, one first signal corresponds to one receiving time, the one receiving time is the time when a terminal device receives the one first signal from the network device, and a transmitting period of the first signal transmitted to the terminal device by the network device is the first time length.

In one possible embodiment, the method further comprises: and sending second information to the terminal equipment, wherein the second information is used for indicating a second time length, the second time length is the adjusted sending period, the second time length is determined according to the first parameter, and the second time length is inversely related to the value of the first parameter.

In a possible implementation manner, the second time period is greater than or equal to a value of a minimum configuration period, where the minimum configuration period is determined by a maximum relative speed of the terminal device with respect to a satellite, and a cyclic prefix length corresponding to the terminal device, and the satellite corresponds to the terminal device; and/or the second duration is smaller than or equal to a value of a maximum configuration period, the maximum configuration period is determined under the constraint of a first preset condition, the first preset condition is that under the condition that a sending period is the maximum configuration period, a timing variation is smaller than half of the cyclic prefix length, and the timing variation is used for representing a deviation amount of an interval between receiving time of any two adjacent first signals relative to an interval between sending time of the any two adjacent first signals.

In one possible embodiment, the method further comprises: determining that an adjustment value is greater than a first threshold, wherein the adjustment value is used for adjusting the adjusted timing advance; and sending third information to the terminal equipment, wherein the third information is used for indicating the adjustment value.

In a third aspect, an embodiment of the present application provides a communication device including a processor, a transceiver, and a memory; the processor is configured to read the program in the memory and execute the following procedure: the method is applied to the terminal equipment of the satellite communication system, and comprises the following steps: determining a plurality of receiving times for receiving a plurality of first signals from a network device, wherein one of the first signals corresponds to one of the receiving times, and the sending period of the network device for sending the first signals to the terminal device is a first duration; determining a first parameter according to the plurality of receiving times and the first duration, wherein the first parameter is used for representing a relative value between intervals of the plurality of receiving times and intervals of the plurality of first signals; and adjusting the timing advance according to the first parameter.

In a fourth aspect, an embodiment of the present application provides a communication device including a processor, a transceiver, and a memory; the processor is configured to read the program in the memory and execute the following procedure: and receiving first information, wherein the first information is used for indicating a first parameter, the first parameter is used for representing a relative value between intervals of a plurality of receiving times of a plurality of first signals and intervals of transmitting times of the plurality of first signals, the first parameter is determined according to the plurality of receiving times and a first time length, one first signal corresponds to one receiving time, the one receiving time is the time when a terminal device receives the one first signal from the network device, and a transmitting period of the first signal transmitted to the terminal device by the network device is the first time length.

In a fifth aspect, an embodiment of the present application provides a communication apparatus, including: the processing module is configured to determine a plurality of receiving times for receiving a plurality of first signals from the network device, where one first signal corresponds to one receiving time, and the network device sends the first signal to the terminal device with a sending period being a first duration, and determine, according to the plurality of receiving times and the first duration, a first parameter, where the first parameter is used to represent a relative value between an interval of the plurality of receiving times of the plurality of first signals and an interval of the sending times of the plurality of first signals, and adjust a timing advance according to the first parameter.

In a sixth aspect, an embodiment of the present application provides a communication apparatus, including: the device comprises a transceiver module, wherein the transceiver module is used for: and receiving first information, wherein the first information is used for indicating a first parameter, the first parameter is used for representing a relative value between intervals of a plurality of receiving times of a plurality of first signals and intervals of transmitting times of the plurality of first signals, the first parameter is determined according to the plurality of receiving times of the plurality of first signals and a first time length, one first signal corresponds to one receiving time, the one receiving time is the time when a terminal device receives the one first signal from the network device, and the transmitting period of the first signal transmitted by the network device to the terminal device is the first time length.

In a seventh aspect, embodiments of the present application provide a computer readable storage medium storing computer instructions that, when run on a computer, cause the computer to perform the method of any one of the first or second aspects.

In an eighth aspect, embodiments of the present application provide a computer program product comprising computer instructions stored in a computer readable storage medium. The computer instructions are read from a computer-readable storage medium by a processor of a communication device, the computer instructions being executed by the processor, causing the communication device to perform the method of any one of the first or second aspects.

The advantages of the second to eighth aspects described above may be referred to the advantages discussed in relation to the first aspect and are not listed here.

Drawings

Fig. 1 is a schematic diagram of a satellite communication system according to an embodiment of the present application;

fig. 2 is a schematic diagram of a second architecture of a satellite communication system according to an embodiment of the present application;

fig. 3 is a schematic flow chart of a communication method according to an embodiment of the present application;

FIG. 4 is a schematic diagram of adjusting timing advance according to an embodiment of the present application;

fig. 5 is a schematic diagram of a process of receiving a plurality of first signals by a terminal device according to an embodiment of the present application;

FIG. 6 is a flowchart of a method for adjusting timing advance according to an embodiment of the present application;

fig. 7 is a flowchart illustrating a process of adjusting a transmission period of a first signal according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 9 is a schematic diagram of a second configuration of a communication device according to an embodiment of the present application;

fig. 10 is a schematic structural diagram III of a communication device according to an embodiment of the present application;

fig. 11 is a schematic structural diagram of a communication device according to an embodiment of the present application.

Detailed Description

In order to better understand the technical solutions provided by the embodiments of the present application, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.

In order to facilitate a better understanding of the technical solution of the present application by a person skilled in the art, the following description is given of the technical terms related to the present application.

The terminal device in the embodiment of the application can be simply called a terminal, and can be a wireless terminal or a wired terminal, and the wireless terminal can be a device for providing voice and/or other service data connectivity for a user, a handheld device with a wireless connection function or other processing devices connected to a wireless modem. The wireless terminals may communicate with one or more core networks via a radio access network (radio access network, RAN), which may be mobile terminals such as mobile phones (or "cellular" phones) and computers with mobile terminals, e.g., portable, pocket, hand-held, computer-built-in, or vehicle-mounted mobile devices that exchange voice and/or data with the radio access network. Such as personal communication services (personal communication service, PCS) phones, cordless phones, session initiation protocol (session initiation protocol, SIP) phones, wireless local loop (wireless local loop, WLL) stations, personal digital assistants (personal digital assistant, PDAs), and the like. A wireless terminal may also be called a system, subscriber unit (subscriber unit), subscriber station (subscriber station), mobile station (mobile station), remote station (remote station), remote terminal (remote terminal), access terminal (access terminal), user terminal (user terminal), user agent (user agent), user equipment (user device or user equipment), satellite phone, etc.

In the present application, with respect to the number of nouns, unless otherwise indicated, reference is made to "a singular noun or plural noun", i.e. "one or more". "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a alone, a and B together, and B alone, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. For example, A/B, means: a or B. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b, or c, represents: a, b, c, a and b, a and c, b and c, or a and b and c, wherein a, b, c may be single or plural.

The embodiment of the application provides a communication method, which provides a scheme for maintaining timing synchronization between network equipment and terminal equipment in a satellite communication system. In the communication method, a terminal device determines a plurality of receiving times for respectively receiving a plurality of first signals from a network device, and determines a first parameter according to the plurality of receiving times and a transmission period for the network device to transmit the plurality of first signals, wherein the first parameter represents a timing deviation condition of the terminal device and the network device, and the terminal device adjusts a timing advance according to the first parameter so as to maintain timing synchronization of the terminal device and the network device.

The communication method in the embodiment of the application can be applied to any satellite communication system. The following description will be given by way of example with reference to the architecture diagrams of the satellite communication system shown in fig. 1 and 2, respectively.

As shown in fig. 1, the satellite communication system includes a terminal device 110, a satellite 120, a network device 130, and a gateway station 140.

If terminal device 110 is within service range 150 of satellite 120, terminal device 110 may communicate with gateway station 140 via satellite 120, and gateway station 140 and network device 130 may communicate with each other. In the embodiment of the present application, the satellite in communication with the terminal device 110 may also be referred to as a satellite corresponding to the terminal device.

It should be noted that, in fig. 1, the network device 130 is taken as an example of a base station, and the specific type of the network device 130 is not limited in practice. The base station in the embodiment of the application is, for example, (5) ^th generation, 5G) of a base station in a communication system, a wireless controller in a cloud radio access network (cloud radio access network, CRAN) scenario, a relay station, an access point, an in-vehicle device, a wearable device, a network device in a future 5G network, or a base station in a future evolved public land mobile network (public land mobile network, PLMN), etc.

In fig. 1, the number of terminal devices 110, the number of network devices 130, the number of satellites 120, and the number of gateway stations 140 are taken as examples, and the number of terminal devices 110, network devices 130, satellites 120, and gateway stations 140 are not limited in practice.

In one possible implementation, the network device 130 of fig. 1 may be coupled to the gateway station 140. In this case, the network device 130 and the gateway station 140 are the same device.

As shown in fig. 2, another possible architecture of a satellite communication system is schematically shown. Unlike fig. 1, in fig. 2, the network device 130 may perform the functions of both the satellite and the base station, for example, the network device 130 is configured by coupling the base station and the satellite, that is, in fig. 2, both the satellite and the base station are regarded as network devices. In fig. 2, terminal device 110 may communicate directly with network device 130.

The following describes a communication method in an embodiment of the present application with reference to the accompanying drawings.

Referring to fig. 3, a flowchart of a communication method according to an embodiment of the application is shown. The communication method shown in fig. 3 may be applied to the satellite communication system of fig. 1 or fig. 2, which is not limited in this embodiment of the present application. The terminal device referred to in fig. 3 is, for example, the terminal device shown in fig. 1 or fig. 2, the network device referred to in fig. 3 is, for example, the network device in fig. 1 or fig. 2, and the satellite referred to in fig. 3 is, for example, the satellite in fig. 1 or the network device in fig. 2.

S301, the network device uses the first duration as a transmission period for transmitting the first signals, and respectively transmits a plurality of first signals to the terminal device.

The first signal is, for example, a tracking reference signal (tracking reference signal, TRS), other signals in a satellite communication system, or a dedicated signal, which is not limited in the embodiment of the present application. Wherein the TRS is, for example, a TRS signal in a New Radio (NR) scenario.

In the embodiment of the application, the network equipment periodically transmits a first signal to the terminal equipment. The embodiment of the application is described by taking the network equipment as an example of a transmission period for transmitting the first signal by taking the first duration as the transmission period. The period of sending the first signal is understood as a first time period, which is an interval before the sending time of any two adjacent first signals sent by the network device to the terminal device is the first time period, and may be further understood as that the network device sends a first signal to the terminal device every other first time period. The sending time of the first signal refers to a time when the network device sends the first signal to the terminal device, for example, the sending time may be a time when the terminal device starts to send the first signal, or may be an ending time when the network device sends the first signal, or may be an intermediate time when the network device sends the first signal.

The manner in which the network device transmits the plurality of first signals to the terminal device is the same, and the description will be given below taking the transmission of one first signal as an example.

If the architecture of the satellite communication system according to the embodiment of the present application is the architecture shown in fig. 1, the network device may send a first signal to the satellite through the gateway station, and the satellite sends a first signal to the terminal device.

Specifically, the network device transmits a first signal to the gateway station. Accordingly, the gateway receives the first signal from the network device. The gateway station transmits the first signal to the satellite, and the satellite receives the first signal from the gateway station, accordingly. Further, the satellite transmits the first signal to the terminal device, and the terminal device receives the first signal from the satellite, accordingly.

In one possible embodiment, if the gateway station and the network device are coupled, the network device may send the first signal directly to the terminal device via the satellite.

If the architecture of the satellite communication system to which the embodiment of the present application is applied is the architecture shown in fig. 2, the network device may directly send the first signal to the terminal device.

For example, taking the value of the first duration as 1ms, the first signal is taken as TRS as an example, the network device sends one first signal (such as TRS 0) to the terminal device at 1ms, one first signal (such as TRS 1) to the terminal device at 2ms, one first signal (such as TRS 2) to the terminal device at 3ms, and so on, the network device sends a plurality of first signals (i.e., TRS0, TRS1, and TRS 2) to the terminal device.

Alternatively, the first duration may be preconfigured in the network device, specified by the protocol, or determined by the network device itself.

Illustratively, the value of the first duration is greater than or equal to the value of the minimum configuration period, and/or the value of the first duration is less than or equal to the value of the maximum configuration period. The minimum configuration period has a value less than the value of the maximum configuration period.

The values of the minimum configuration period and the maximum configuration period can be preconfigured in the network equipment, or specified by a protocol or determined by the network equipment.

For example, one way to determine the minimum configuration period is as follows.

The network device may determine the minimum configuration period according to a maximum relative rate of the terminal device with respect to the satellite and a cyclic prefix length (CP) corresponding to the terminal device. For example, one calculation formula for determining the minimum configuration period is as follows.

T _min ＝CP×c/(20×v) (1)

Wherein T is _min Representing the minimum configuration period, c represents the speed of light, v represents the maximum relative velocity of the terminal device with respect to the satellite.

One way to determine the maximum configuration period is as follows, for example.

In a satellite communication system, timing synchronization generally requires that a time deviation (also may be referred to as a timing deviation) between a terminal device and a network device is less than or equal to half of a CP corresponding to the terminal device, and if the timing deviation between the terminal device and the network device is greater than half of the CP, a failure of timing synchronization between the terminal device and the network device is likely to occur. Therefore, in the embodiment of the application, the timing deviation between the terminal equipment and the network equipment is less than half of the CP as the first preset condition, and the value of the maximum configuration period is determined under the constraint of the first preset condition.

For example, a calculation formula for calculating the maximum configuration period is as follows.

T _max ＝CP*c/2v (2)

As an example, the transmission period of the network device to transmit the first signal to any terminal device may be the first duration. In other words, the transmission period of transmitting the first signal may be determined or configured with the network device as granularity.

S302, the terminal equipment receives a plurality of first signals respectively.

The network device respectively transmits a plurality of first signals, and the terminal device can correspondingly receive the plurality of first signals.

S303, the terminal equipment determines a plurality of receiving times.

The terminal device receives a first signal and determines the time of reception of the first signal. The reception time refers to the time when the terminal device receives the first signal from the network device. For example, the receiving time may be a time when the terminal device starts to receive the first signal, or may be an end time when the terminal device receives the first signal, or may be an intermediate time when the terminal device receives the first signal, which is not limited in the embodiment of the present application.

Similarly, the terminal device may obtain a reception time corresponding to each of the plurality of first signals, and thus determine a plurality of reception times. One of the plurality of reception times corresponds to one of the first signals.

Alternatively, the terminal device may execute S302 first and then execute S303, or may execute S302 and S303 simultaneously, which is not limited in the embodiment of the present application.

For example, referring to fig. 4, a process diagram of a terminal device receiving a plurality of first signals is provided in an embodiment of the present application. In fig. 4, the first signal is taken as the TRS, and the network device takes T as a transmission period for transmitting the first signal (i.e., the first duration is T) as an example.

As shown in fig. 4, the network device transmits a plurality of first signals TRS0, TRS1, TRS2, and TRS3 to the terminal device at times t0, t1, t2, and t3, respectively. Wherein, the interval between T0 and T1 is T, the interval between T1 and T2 is T, and the interval between T2 and T3 is T. Accordingly, the terminal device receives a plurality of first signals TRS0, TRS1, TRS2 and TRS3 at times t0', t1', t2 'and t3', respectively.

In a possible implementation, the network device sends the first signal to the terminal device in a sending period of the first signal, and the terminal device may perform the step S304 after receiving a certain number of the first signals. In other words, the number of first signals participating in the calculation process of S304 is less than or equal to the number of first signals transmitted by the network device to the terminal device. In the embodiment of the present application, the number of first signals participating in the calculation process of S304 is equal to the number of first signals sent by the network device to the terminal device.

Accordingly, the number of the plurality of receiving times is smaller than or equal to the number of the first signals sent by the network device to the terminal device. The number of the plurality of reception times is greater than or equal to 2.

As an example, the number of multiple reception times may be related to a signal-to-noise ratio (SNR) of the satellite communication system in the embodiment of the present application. For example, the number of multiple receive times is inversely related to the signal-to-noise ratio.

Specifically, the larger the signal-to-noise ratio is, the better the communication quality in the satellite communication system is, so that the number of the plurality of receiving times can be relatively smaller, and the calculated amount of the terminal equipment can be relatively reduced; the smaller the signal-to-noise ratio, which is indicative of a poor communication quality in the satellite communication system, the larger the number of times of reception can be obtained, which can facilitate a subsequent more accurate determination of the first parameter by the terminal device.

S304, the terminal equipment determines a first parameter according to the plurality of receiving times and the first time length.

The manner in which the terminal device obtains the first duration may be varied, as will be illustrated below.

For example, the network device may indicate the first time length to the terminal device after determining the first time length. Or, for example, the first time period is preconfigured in the network device, in which case the first time period may also be preconfigured in the terminal device.

And under the condition that the timing synchronization is normal between the network equipment and the terminal equipment, the network equipment sends a first signal by taking the first duration as a sending period. In theory, the terminal device also takes the first duration as the receiving period for receiving the first signal. The receiving period for receiving the first signal is a first duration, which is understood to mean that the terminal device receives a first signal every time the first duration is provided. However, due to the timing offset of the terminal device from the network device, this results in that the interval between the reception times of two adjacent first signals by the terminal device may not be the first time length. In order to adjust the timing deviation between the terminal device and the network device, in the embodiment of the present application, the terminal device may determine the first parameter according to a plurality of receiving times and the first time length. Wherein the first parameter is used to represent a relative value between an interval of reception times of the plurality of first signals and an interval of transmission times of the plurality of first signals.

The determining manner of the first parameter by the terminal device may be various, and is described in the following examples.

Determining a first mode.

The terminal device determines an interval between every two adjacent receiving times of the plurality of receiving times; a first parameter is determined based on the determined interval and the first time length.

The terminal device may determine an interval between two adjacent reception times among the plurality of reception times, and for convenience of description, the interval between each two adjacent reception times will be referred to as a first interval in the embodiment of the present application. The adjacent two reception times refer to reception times at which the terminal device receives the adjacent two first signals. Adjacent two first signals may be understood as two first signals transmitted by the network device in sequence. For example, in the case of the first signal being a TRS, after the network device sends the TRS1 to the terminal device, the network device sends the TRS2 to the terminal device again, so that the TRS1 and the TRS2 can be regarded as two adjacent first signals.

Since the terminal device may determine a plurality of reception times, the terminal device may determine at least one first interval, and further determine the first parameter according to the at least one first interval and the first duration.

In one possible implementation, the first parameter includes a timing variation. The timing variation amount represents an absolute difference between at least one first interval and an interval of transmission times of the plurality of first signals.

For example, one calculation formula for determining the first parameter is as follows.

Wherein DeltaT _n Representing the reception of the nth first signal and the (n-1) th first signal The interval between times, i.e. the first interval, may also be referred to as the interval between the reception times of the nth first signal and the (n-1) th first signal; t represents a first time period.

In the embodiment of the application, the larger the absolute value of the timing variation is, the larger the timing deviation between the terminal equipment and the network equipment is; the smaller the absolute value of the timing change amount, the smaller the timing deviation between the terminal device and the network device.

In one possible implementation, the first parameter includes a rate of change of timing. The timing change rate is used to represent a relative comparison result of the timing change amount with intervals between the transmission times of the plurality of first signals.

Similarly, if T _drift The larger the sum representing at least one first interval, the larger the timing deviation between the terminal device and the network device; if T _drift The smaller the sum of the first intervals is, the smaller the timing deviation between the terminal device and the network device is.

Alternatively, T _drift Any number may be used. For example, if the satellite moves relatively far from the terminal device, T _drift Can be a positive number; if the satellite moves relatively close to the terminal device, T _drift May be negative.

And determining a second mode.

The terminal device determines an interval between the first receiving time and each of the plurality of receiving times, and for convenience of description, the interval is referred to as a second interval in the embodiment of the present application; and the terminal equipment determines a first parameter according to the determined interval and the first time length. The first reception time is a reception time that is temporally most forward among the plurality of reception times.

In one possible implementation, the first parameter includes a rate of change of timing.

For example, another calculation formula for determining the first parameter is as follows.

Where Δtn' represents a second interval, i.e., an interval between the nth reception time and the first reception time, and may also be referred to as an interval between the nth reception time and the first reception time.

As an example, if the first parameter includes a timing rate of change determined by any of the above formulas, the unit of the timing rate of change may be in us/s. us/s indicates how many microseconds the time changes per second.

Alternatively, the unit of the timing change rate may be Tc/ms. Where Tc/ms denotes how much Tc the time varies per millisecond or, if the satellite communication system is applied in an NR scenario, tc/ms can also be understood as how much Tc the time varies within the duration of each subframe of the terminal device. Where tc=1/(480 khz x 4096). In this case, the quantization accuracy of the first parameter may be 1Tc/ms, 2Tc/ms, or p×tc/ms, where P is a positive integer.

Alternatively, the units of the first parameter may be Ts/ms. Ts/ms indicates how much Ts changes per millisecond. Where ts=1/(15 khz×2048), ts/tc=64, the meaning of Tc can be referred to above. In this case, the quantization accuracy of the first parameter is, for example, 1Ts/ms, 2Ts/ms, or p×ts/ms, and P is a positive integer.

As one example, the first parameter may include both a rate of timing change and an amount of timing change. The timing change rate may be determined according to the above formula (4) or (5).

The first and second determining modes are described by way of example, but the first parameter may be determined in a plurality of ways, which is not limited in the embodiment of the present application.

And S305, the terminal equipment adjusts the timing advance according to the first parameter to obtain the adjusted timing advance.

The terminal device adjusts the time of sending the second signal (the second signal is the uplink signal) to the network device according to the preset Timing Advance (TA) amount, so that the time when the second signal arrives at the network device is the same as the time when the network device sends the first signal to the terminal device, and the timing synchronization between the network device and the terminal device is realized. The second signal is, for example, a TRS or a dedicated signal, which is not limited in the embodiment of the present application. However, after the initial timing synchronization between the network device and the terminal device is established due to the high-speed movement of the satellite, the high-speed relative movement of the satellite and the long-distance transmission between the network device and the terminal device may cause the timing synchronization deviation between the network device and the terminal device to exceed CP/2, so that the timing synchronization is out of step, and the like, so that the timing synchronization is continuously maintained in the embodiment of the present application. An example description will be given below of a manner in which the terminal device maintains timing synchronization based on the first parameter. It should be noted that, in the embodiment of the present application, the timing synchronization includes uplink timing synchronization.

The first parameter includes different contents, and the terminal device adjusts the timing advance, and the manner of maintaining timing synchronization is also different, which will be described below.

In case one, the first parameter includes a timing variation.

The terminal device can adjust the timing advance according to the timing change.

For example, one calculation formula for adjusting the timing advance is as follows.

Wherein, TA represents timing advance pre-configured in the terminal equipment, and TA' represents the result after TA is adjusted.

In case two, the first parameter includes a timing rate of change.

The terminal device determines a first parameter T assuming that the satellite is distant from the terminal device at a relative velocity v _drift Wherein the terminal device can determine according to any one of the above determination mode one or determination mode twoAnd (5) determining the timing change amount. In this case, T is calculated _drift Is t _n First parameter of time, t _n The uplink signal transmitted by the terminal device at the moment is approximately (t) _n +TA/2) time of day to the network device.

For example, a calculation formula for adjusting the timing advance preconfigured in the terminal device is as follows.

In case three, the first parameter includes a timing change rate and a timing change amount.

The terminal device may adjust the timing advance in any of the above cases one or two, and is not listed here.

Fig. 5 is a schematic diagram of a process for adjusting timing advance according to an embodiment of the present application. As shown in fig. 5, the terminal device determines the adjusted timing advance according to any one of the first to third cases, and sends the second signal according to the timing advance after the adjustment, so that the receiving time of the second signal reaching the network device is the same as the sending time of the first signal sent by the network device to the terminal device, thereby realizing timing synchronization.

As an example, in an embodiment of the present application, S301 and S302 are optional steps, illustrated in dashed lines in fig. 3.

In the embodiment of the application, the terminal equipment can determine the receiving time of a plurality of first signals, determine the first parameter for describing the timing deviation condition between the network equipment and the terminal equipment according to the receiving time and the sending period of the first signals, and adjust the timing advance according to the first parameter, thereby realizing the mechanism of timing synchronization between the network equipment and the terminal equipment.

In a possible implementation manner, the terminal device may further adjust the adjusted timing advance according to the indication of the network device. An example description is provided below in connection with a method flowchart for adjusting timing advance as shown in fig. 6.

S601, the network device determines an adjustment value.

For example, the terminal device may periodically send the second signal to the network device. Accordingly, the network device receives the second signal. The content of the second signal may be referred to above. The network device determines the difference between the time of receiving the second signal and the time pre-stored by the network device (i.e. corresponding to the timing deviation between the network device and the terminal device), and takes the difference as the adjustment value. The time pre-stored by the network device refers to the time pre-stored by the network device for theoretically receiving the second signal. The adjustment value may be caused by a clock error between the network device and the terminal device, or may be caused by the terminal device not performing S305 in time, or the like.

In one possible implementation, the network device may determine whether it supports closed loop control. If the network device supports closed loop control, the network device may perform the step of S601. If the network device does not support closed loop control, the step of S601 is not performed.

In particular, in a scenario where the network device maintains its timing synchronization with the terminal device, the network device may support both open loop control and closed loop control. The open loop maintenance refers to self-maintenance timing synchronization of the terminal equipment, and comprises maintenance of uplink timing synchronization and downlink timing synchronization. The closed-loop maintenance means that the network equipment detects the uplink timing compensated by the terminal equipment and indicates the terminal equipment to perform further timing compensation according to the situation.

If the network device supports open loop maintenance in this manner, the network device may not need to perform the step of S601. If the network device supports closed loop control, the network device may perform S601 so that the terminal device may perform timing compensation according to the adjustment value.

Further, the network device may determine whether the adjustment value is greater than the first threshold, and if the adjustment value is less than or equal to the first threshold, it indicates that the timing deviation between the network device and the terminal device is relatively small, and thus, the network device may not perform the step of S601. If the adjustment value is greater than the first threshold value, it indicates that the timing deviation between the network device and the terminal device is relatively large, so the network device may perform the step of S601. Therefore, under the condition of maintaining the timing synchronization of the terminal equipment and the network equipment, the number of closed-loop control times of the network equipment can be relatively reduced, and the signaling overhead is saved.

S602, the network device sends third information to the terminal device. Accordingly, the terminal device receives the third information from the network device. The third information is used to indicate an adjustment value.

Alternatively, the third information may be a timing advance command (timing advance command, TAC). In this manner, the network device indicates the adjustment value to the terminal device through the TAC, and it is unnecessary to use separate signaling to indicate the adjustment value, which is beneficial to saving signaling overhead.

Alternatively, the third information may include a value of the adjustment value.

S603, the terminal equipment adjusts the adjusted timing advance according to the adjustment value.

After receiving the adjustment value, the terminal device may further adjust the adjusted timing advance based on the adjustment value.

In one possible implementation manner, the network device may adjust the transmission period of the first signal based on the first parameter, so that the transmission period of the first signal transmitted by the network device is more reasonable, so as to avoid a situation that the signaling overhead is too large due to too small value of the transmission period of the first signal transmitted by the network device, and also avoid a situation that the precision of determining the first parameter by the terminal device is too small due to too large value of the transmission period of the first signal transmitted by the network device.

Referring to fig. 7, a flowchart of a method for adjusting a transmission period of a first signal by a network device according to an embodiment of the present application is shown.

S701, the terminal device sends first information to the network device. Accordingly, the network device receives the first information from the terminal device. The first information is used to indicate a first parameter.

Alternatively, the first information may directly indicate the value of the first parameter.

Specifically, the first information includes N bits (bits), a part of the N bits being used to indicate positive and negative of the first parameter, and another part of the N bits being used to indicate a value of the first parameter.

For example, N bits are 6 bits, 1 bit in the N bits represents a positive and negative value, the value 0 of the 1 bit represents a positive number of the first parameter, and the value 1 of the 1 bit represents a negative number of the first parameter; 5 bits of the N bits represent the value of the first parameter, for example, the quantization accuracy of the value of the first parameter is 1us/s, and the representation range of the quantization accuracy corresponding to the first parameter is 0us/s to 31us/s.

For another example, N bits are 6 bits, 1 bit in the N bits indicates positive and negative, the value 0 of the 1 bit indicates that the first parameter is positive, and the value 1 of the 1 bit indicates that the first parameter is negative; 5 bits of the N bits represent a value of the first parameter, for example, the quantization accuracy of the first parameter is 2us/s, and the representation range of the quantization accuracy corresponding to the first parameter is 0us/s to 62us/s.

For another example, N bits are 4 bits, 1 bit in the N bits represents a positive or negative value, the value 0 of the 1 bit represents a positive number of the first parameter, and the value 1 of the 1 bit represents a negative number of the first parameter; 3 bits of the N bits represent the value of the first parameter, for example, the quantization accuracy of the first parameter is 4us/s, and the representation range of the quantization accuracy corresponding to the first parameter is 0us/s to 28us/s.

Optionally, the first information may indicate a second range of values to which the value of the first parameter belongs. For example, the first information includes M bits, where the M bits are used to indicate a second value range to which the first parameter belongs. The second value range refers to a value range to which the first parameter belongs, but is not limited to a specific value range.

For example, the possible range of values of the first parameter may be divided into two, and M bits are 1 bit, i.e., the second range of values is represented by 1 bit.

For example, if the value of M bits is 0, it represents |T _drift I < 15us/s; if the M ratiosThe value of the bit is 1, which represents |T _drift |≥15us/s。

For example two, the possible range of values of the first parameter may be divided into four and M bits are 2 bits, i.e. the second range of values is represented by 2 bits.

For example, if the value of M bits is 00, it represents |T _drift I < 8us/s; if the value of M bits is 01, the value of M bits is 8 us/s.ltoreq.T _drift I < 16us/s; if the value of M bits is 11, 16us/s is less than or equal to |T _drift I < 24us/s; if the value of M bits is 10, 24us/s is less than or equal to |T _drift |＜32us/s。

Example three, the range of possible values of the first parameter may be divided into eight and M bits into 3 bits, i.e. the second range of values is represented by 3 bits.

For example, if the value of M bits is 000, it represents |T _drift I < 4us/s; if the value of M bits is 001, it means 4 us/s.ltoreq.T _drift I < 8us/s; if the value of M bits is 010, 8us/s is less than or equal to |T _drift I < 12us/s; if the value of M bits is 011, it means 12 us/s.ltoreq.T _drift I < 16us/s; if the value of M bits is 100, it means 16 us/s.ltoreq.T _drift I < 20us/s; if the value of M bits is 101, it means 20 us/s.ltoreq.T _drift I < 24us/s; if the value of M bits is 110, 24us/s is less than or equal to |T _drift I < 28us/s; if the value of M bits is 111, 28us/s is less than or equal to |T _drift |＜32us/s。

As one example, the first information may indicate a second range of values to which the value of the first parameter belongs, and the value of the first parameter.

Specifically, the first information includes (m+n) bits, where N bits indicate a value of the first parameter, and M bits indicate a second value range to which the value of the first parameter belongs. The manner in which N bits indicate the value of the first parameter and the manner in which M bits indicate the second value range to which the value of the first parameter belongs may be referred to in the foregoing, and are not listed here.

In one possible implementation, the terminal device may periodically send the first information to the network device.

For example, the terminal device periodically determines the first parameter and periodically transmits the first information to the network device.

The transmission period of the first information transmitted by the terminal device may be specified by a protocol or configured by the network device through signaling. Signaling such as radio resource control (radio resource control, RRC) signaling, or medium access control element (media access control-control element, MAC-CE), etc.

In another possible implementation manner, the terminal device determines that the first parameter meets the second preset condition, and then performs step S701. The second preset condition may be preconfigured in the terminal device or configured by a protocol, which is not limited in the embodiment of the present application.

For example, the second preset condition is that the value of the first parameter is greater than the second threshold. Or for example, the second preset condition is that the difference value of the first parameter determined at this time compared with the value of the first parameter determined at last time by the terminal device meets a third threshold, and specifically, for example, the value range of the first parameter determined at this time compared with the value of the first parameter determined at last time by the terminal device is different.

For example, taking the case that the first information is used to indicate the value range to which the first parameter belongs, if the terminal device determines that the value range to which the first parameter determined this time belongs is different from the value range to which the first parameter determined last time by the terminal device belongs, the terminal device may execute the step S701.

In the embodiment of the application, the terminal equipment can report the first parameter to the network equipment under the condition that the first parameter meets a certain condition, which is beneficial to reducing the data transmission times between the terminal equipment and the network equipment.

S702, the network equipment adjusts a sending period for sending the first signal according to the first parameter to obtain a second duration.

For convenience of description, in the embodiment of the present application, the value of the adjusted transmission period for transmitting the first signal is described as the second duration. Wherein the second time period is different from the first time period, and the value of the second time period is inversely related to the value of the first parameter.

In particular, if the value of the first parameter is larger, this means that the timing deviation between the terminal device and the network device is larger, which means that the accuracy requirement for measuring the timing deviation is higher, in which case the network device may relatively reduce the transmission period for transmitting the first signal. Reducing the transmission period of transmitting the first signal means reducing the duration of the transmission period of transmitting the first signal, i.e. the frequency of transmitting the first signal by the network device per unit time is greater. If the value of the first parameter is smaller, the timing deviation between the terminal device and the network device is smaller, in this case, the network device can improve the transmission period of the first signal, and the number of times that the network device transmits the first signal to the terminal device can be relatively reduced, so as to save transmission overhead. Increasing the transmission period of transmitting the first signal means increasing the duration of the transmission period of transmitting the first signal, i.e. the frequency of transmitting the first signal by the network device per unit time is less.

Optionally, the second duration may be greater than or equal to the minimum configuration period, and/or less than or equal to the maximum configuration period. The content of the minimum configuration period and the maximum configuration period can be referred to the foregoing.

Optionally, the network device may determine the value of the second duration according to a relative speed of the terminal device and the satellite.

The relative speed between the terminal device and the satellite is one of the reasons for causing the timing change between the network device and the terminal device, so in the embodiment of the application, the second duration can be determined directly by the relative speed of the terminal device with respect to the satellite.

Specifically, the network device pre-stores the duration of the transmission period of the first signal corresponding to each of the different value ranges. After the network device determines the relative speed of the terminal device relative to the satellite, determining a first value range to which the relative speed belongs, and further taking the duration corresponding to the first value range as a second duration.

After determining the second time length, the network device sends the first signal to the terminal device by taking the second time length as a sending period for sending the first signal.

S703, the network device sends the second information to the terminal device. Accordingly, the terminal device receives the second information from the network device. The second information is used to indicate a second duration.

Optionally, after determining the second duration, the network device indicates the second duration to the terminal device, so that the terminal device may calculate the next first parameter according to the second duration. Wherein the process of the terminal device calculating the next first parameter may be the process discussed with reference to fig. 3. Further, the network device and the terminal device may also perform the procedure shown in fig. 6 and fig. 7 according to the calculated next first parameter.

An embodiment of the present application provides a communication device, please refer to fig. 8, which is a schematic structural diagram of the communication device. The communication device shown in fig. 8 can realize the functions of the preamble terminal apparatus.

As shown in fig. 8, the communication device includes a processing module 801. For example, the processing module 801 is configured to determine a plurality of receiving times for receiving a plurality of first signals from a network device, where one first signal corresponds to one receiving time, and the network device sends the first signal to the terminal device with a sending period being a first duration, and determine, according to the plurality of receiving times and the first duration, a first parameter, where the first parameter is used to represent a relative value between an interval of the plurality of receiving times of the plurality of first signals and an interval of the sending times of the plurality of first signals, and adjust a timing advance according to the first parameter.

In a possible embodiment, the communication device further comprises a transceiver module 802, the transceiver module 802 being configured to: transmitting first information to the network device, the first information being used to indicate the first parameter; and receiving second information, wherein the second information is used for indicating a second time length, the second time length is the adjusted sending period, the second time length is determined according to the first parameter, and the second time length is inversely related to the value of the first parameter.

In one possible implementation manner, the second duration is a duration corresponding to a first value range, where the first value range is a value range to which a relative speed of the terminal device with respect to the satellite belongs, and the larger a minimum value in the first value range is, the smaller a duration corresponding to the first value range is, and the satellite corresponds to the terminal device.

In a possible implementation manner, the second time period is greater than or equal to a value of a minimum configuration period, where the minimum configuration period is determined by a maximum relative speed of the terminal device with respect to a satellite, and a cyclic prefix length corresponding to the terminal device, and the satellite corresponds to the terminal device; and/or the second duration is less than or equal to a value of a maximum configuration period, the maximum configuration period is determined under the constraint of a first preset condition, the first preset condition is that a timing variation is less than half of the cyclic prefix length when the transmission period is the maximum configuration period, and the timing variation is used for representing a deviation amount of an interval between receiving time of any two adjacent first signals relative to an interval between transmitting time of any two adjacent first signals transmitted by the network device.

In one possible implementation, the processing module 801 is further configured to: and determining that the first parameter meets a second preset condition.

In one possible implementation manner, the first information includes N bits, where a part of bits in the N bits represent positive and negative of the first parameter, another part of bits in the N bits represent a value of the first parameter, and N is an integer greater than 1; and/or, the first information comprises M bits, the M bits represent a second value range to which the value of the first parameter belongs, and M is a positive integer.

In one possible implementation, the processing module 801 is specifically configured to: determining an interval between each adjacent two of the plurality of receive times; and determining the first parameter according to the determined interval and the first time length.

In one possible implementation, the processing module 801 is specifically configured to: determining an interval between a first reception time and each of the plurality of reception times, respectively, the first reception time being one of the plurality of reception times; and determining the first parameter according to the determined interval and the first time length.

In one possible implementation, the processing module 801 is specifically configured to: and weighting the pre-configured timing advance according to the first parameter to obtain the adjusted timing advance.

In one possible implementation, the processing module 801 is further configured to: receiving third information from the network device, the third information being used to indicate an adjustment value; and adjusting the adjusted timing advance according to the adjustment value.

As an example, transceiver module 802 in fig. 8 is an optional module.

It should be noted that the communication device shown in fig. 8 may also implement any of the communication methods discussed above, and are not listed here.

An embodiment of the present application provides a communication device, please refer to fig. 9, which is a schematic structural diagram of the communication device. The communication apparatus shown in fig. 9 may implement the functions of the foregoing network device.

As shown in fig. 9, the communication device includes a transceiver module 901. For example, the transceiver module 901 is configured to: and receiving first information, wherein the first information is used for indicating a first parameter, the first parameter is used for representing a relative value between intervals of a plurality of receiving times of a plurality of first signals and intervals of transmitting times of the plurality of first signals, the first parameter is determined according to the plurality of receiving times and a first time length, one first signal corresponds to one receiving time, the one receiving time is the time of the terminal equipment receiving the one first signal from the network equipment, and the transmitting period of the first signal transmitted to the terminal equipment by the network equipment is the first time length.

In one possible implementation, the transceiver module 901 is further configured to: and sending second information to the terminal equipment, wherein the second information is used for indicating a second time length, the second time length is the adjusted sending period, the second time length is determined according to the first parameter, and the second time length is inversely related to the value of the first parameter.

In a possible implementation manner, the second time period is greater than or equal to a value of a minimum configuration period, where the minimum configuration period is determined by a maximum relative speed of the terminal device with respect to a satellite, and a cyclic prefix length corresponding to the terminal device, and the satellite corresponds to the terminal device; and/or the second duration is smaller than or equal to a value of a maximum configuration period, the maximum configuration period is determined under the constraint of a first preset condition, the first preset condition is that under the condition that the transmission period is the maximum configuration period, the timing variation is smaller than half of the cyclic prefix length, and the timing variation is used for representing the deviation amount of the interval between the receiving time of receiving any two adjacent first signals relative to the interval between the transmitting time of transmitting any two adjacent first signals by the network equipment.

In one possible implementation, the communication device further includes a processing module 902, wherein: the processing module 902 is configured to determine that an adjustment value is greater than a first threshold, where the adjustment value is used to adjust the adjusted timing advance; the transceiver module 901 is configured to send third information to the terminal device, where the third information is used to indicate the adjustment value.

As one example, the processing module 902 in fig. 9 is an optional module.

It should be noted that the communication device shown in fig. 9 may also implement any of the communication methods discussed above, and are not listed here.

The embodiment of the application provides a communication device. Referring to fig. 10, the communication device includes a processor 1001, a transceiver 1002, and a memory 1003.

The processor 1001 may be a central processing unit (central processing unit, CPU), or a digital processing unit or the like. The specific connection medium between the memory 1003 and the processor 1001 is not limited in the embodiment of the present application. In fig. 10, the processor 1001, the transceiver 1002 and the memory 1003 are connected by buses, and the connection manner between other components is only illustrative and not limited to the above. The buses may be divided into address buses, data buses, control buses, etc. For ease of illustration, only one line is shown in fig. 10, but not only one bus or one type of bus.

The memory 1003 may be a volatile memory (RAM) such as a random-access memory; the memory 1003 may also be a nonvolatile memory (non-volatile memory), such as a read-only memory, a flash memory (flash memory), a hard disk (HDD) or a Solid State Drive (SSD), or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited thereto. The memory 1003 may be a combination of the above memories.

The processor 1001 is configured to execute any of the communication methods as described above when calling the computer program stored in the memory 1003, and can realize the functions of the communication device shown in fig. 8, and can also realize the functions of the terminal device.

Optionally, a memory 1003 may be coupled to the processor 1001.

Alternatively, in fig. 10, the processor 1001, the transceiver 1002, and the memory 1003 are taken as one example, and the number of the processor 1001, the transceiver 1002, and the memory 1003 is not limited in practice.

Referring to fig. 11, the communication device includes a processor 1101, a transceiver 1102, and a memory 1103. The specific implementation of the processor 1101, transceiver 1102 and memory 1103 may be referred to above.

The processor 1101 is configured to execute any of the communication methods as discussed above when calling the computer program stored in the memory 1103, and may also implement the functions of the communication device shown in fig. 9, and may also implement the functions of the foregoing network device.

Optionally, a memory 1103 may be provided coupled to the processor 1101.

Alternatively, in fig. 10, the processor 1101, the transceiver 1102, and the memory 1103 are taken as one example, and the number of the processor 1101, the transceiver 1102, and the memory 1103 is not limited in practice.

Embodiments of the present application provide a computer readable storage medium storing computer instructions which, when run on a computer, cause the computer to perform a method as claimed in any one of the preceding claims.

Embodiments of the present application provide a computer program product comprising computer instructions stored in a computer-readable storage medium. The computer instructions are read from a computer-readable storage medium by a processor of a communication device, the computer instructions being executed by the processor, causing the communication device to perform the method as set forth in any one of the preceding claims.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. A communication method, applied to a terminal device of a satellite communication system, the method comprising:

determining a plurality of receiving times for receiving a plurality of first signals from a network device, wherein one of the first signals corresponds to one of the receiving times, and the sending period of the network device for sending the first signals to the terminal device is a first duration;

determining a first parameter according to the plurality of receiving times and the first duration, wherein the first parameter is used for representing a relative value between intervals of the plurality of receiving times and intervals of the plurality of first signals;

And adjusting the timing advance according to the first parameter.

2. The method according to claim 1, wherein the method further comprises:

transmitting first information to the network device, wherein the first information is used for indicating the first parameter;

receiving second information, where the second information is used to indicate a second duration, where the second duration is the adjusted sending period, and the second duration is determined according to the first parameter, where the second duration is inversely related to the value of the first parameter.

3. The method of claim 2, wherein the step of determining the position of the substrate comprises,

the second time length is a time length corresponding to a first value range, the first value range is a value range to which the relative speed of the terminal device relative to the satellite belongs, wherein the larger the minimum value in the first value range is, the smaller the time length corresponding to the first value range is, and the satellite corresponds to the terminal device.

4. A method according to claim 2 or 3, characterized in that,

the second time length is greater than or equal to a value of a minimum configuration period, the minimum configuration period is determined by a maximum relative speed of the terminal equipment relative to a satellite and a cyclic prefix length corresponding to the terminal equipment, and the satellite corresponds to the terminal equipment; and/or the number of the groups of groups,

The second duration is smaller than or equal to a value of a maximum configuration period, the maximum configuration period is determined under the constraint of a first preset condition, the first preset condition is that a timing variation is smaller than half of the cyclic prefix length when the sending period is the maximum configuration period, and the timing variation is used for representing a deviation amount of an interval between receiving time of any two adjacent first signals relative to an interval between sending time of the any two adjacent first signals.

5. The method according to any one of claims 2-4, further comprising:

and determining that the first parameter meets a second preset condition.

6. The method according to any one of claim 2 to 5, wherein,

n bits contained in the first information, wherein a part of bits in the N bits represent positive and negative of the first parameter, another part of bits in the N bits represent the value of the first parameter, and N is an integer greater than 1; and/or the number of the groups of groups,

the first information includes M bits, where M represents a second value range to which the value of the first parameter belongs, and M is a positive integer.

7. The method of any of claims 1-6, wherein determining a first parameter based on the plurality of receive times and the first duration comprises:

determining an interval between each adjacent two of the plurality of receive times;

and determining the first parameter according to the determined interval and the first duration.

8. The method of any of claims 1-6, wherein determining a first parameter based on the plurality of receive times and the first duration comprises:

determining an interval between a first reception time and each of the plurality of reception times, respectively, the first reception time being one of the plurality of reception times;

9. The method according to any of claims 1-8, wherein adjusting a timing advance according to the first parameter comprises:

and weighting the pre-configured timing advance according to the first parameter to obtain the adjusted timing advance.

10. The method of claim 9, wherein adjusting the timing advance based on the first parameter further comprises:

Receiving third information from the network device, the third information being used to indicate an adjustment value;

and adjusting the adjusted timing advance according to the adjustment value.

11. A communication method for use in a network device of a satellite communication system, the method comprising:

and receiving first information, wherein the first information is used for indicating a first parameter, the first parameter is used for representing a relative value between intervals of a plurality of receiving times of a plurality of first signals and intervals of transmitting times of the plurality of first signals, the first parameter is determined according to the plurality of receiving times and a first time length, one first signal corresponds to one receiving time, the one receiving time is the time when a terminal device receives the one first signal from the network device, and a transmitting period of the first signal transmitted to the terminal device by the network device is the first time length.

12. The method of claim 11, wherein the method further comprises:

and sending second information to the terminal equipment, wherein the second information is used for indicating a second time length, the second time length is the adjusted sending period, the second time length is determined according to the first parameter, and the second time length is inversely related to the value of the first parameter.

13. The method of claim 12, wherein the step of determining the position of the probe is performed,

14. The method according to claim 12 or 13, wherein,

the second duration is smaller than or equal to a value of a maximum configuration period, the maximum configuration period is determined under the constraint of a first preset condition, the first preset condition is that under the condition that a sending period is the maximum configuration period, a timing variation is smaller than half of the cyclic prefix length, and the timing variation is used for representing a deviation amount of an interval between receiving time of any two adjacent first signals relative to an interval between sending time of the any two adjacent first signals.

15. The method according to any one of claims 11 to 14, wherein,

16. The method according to any one of claims 11-15, further comprising:

determining that an adjustment value is greater than a first threshold, wherein the adjustment value is used for adjusting the adjusted timing advance;

and sending third information to the terminal equipment, wherein the third information is used for indicating the adjustment value.

17. A communication device comprising a processor, a transceiver, and a memory;

the processor is configured to read the program in the memory and execute the following procedure:

determining a plurality of receiving times for receiving a plurality of first signals from a network device, wherein one of the first signals corresponds to one of the receiving times, and the sending period of the network device for sending the first signals to a terminal device is a first duration;

and adjusting the timing advance according to the first parameter.

18. The apparatus of claim 17, wherein the processor is further configured to:

19. The apparatus of claim 18, wherein the second time period is a time period corresponding to a first range of values to which a relative velocity of the terminal device with respect to a satellite belongs, wherein the larger the minimum value in the first range of values is, the smaller the time period corresponding to the first range of values is, and the satellite corresponds to the terminal device.

20. The apparatus according to claim 18 or 19, wherein the second time period is greater than or equal to a value of a minimum configuration period, the minimum configuration period being determined by a maximum relative velocity of the terminal device with respect to a satellite, and a cyclic prefix length corresponding to the terminal device, the satellite corresponding to the terminal device; and/or the number of the groups of groups,

21. The apparatus of any one of claims 18-20, wherein the processor is further configured to:

and determining that the first parameter meets a second preset condition.

22. The apparatus of any one of claims 18-21, wherein the processor is further configured to:

23. The apparatus according to any one of claims 17-22, wherein the processor is specifically configured to:

24. The apparatus according to any one of claims 17-22, wherein the processor is specifically configured to:

25. The apparatus according to any one of claims 17-24, wherein the processor is specifically configured to:

26. The apparatus of claim 25, wherein the processor is further configured to:

receiving third information from the network device, the third information being used to indicate an adjustment value, the adjustment value being greater than a first threshold;

and adjusting the adjusted timing advance according to the adjustment value.

27. A communication device comprising a processor, a transceiver, and a memory;

28. The apparatus of claim 27, wherein the processor is further configured to:

29. The apparatus of claim 28, wherein the processor is further configured to:

30. The apparatus of claim 28 or 29, wherein the device comprises a plurality of sensors,

31. The apparatus of any one of claims 27-30, wherein,

32. The apparatus of any one of claims 27-31, wherein the processor is further configured to:

33. A communication device, comprising:

the processing module is configured to determine a plurality of receiving times for receiving a plurality of first signals from the network device, where one first signal corresponds to one receiving time, and the network device sends the first signal to the terminal device with a sending period being a first duration, and determine, according to the plurality of receiving times and the first duration, a first parameter, where the first parameter is used to represent a relative value between an interval of the plurality of receiving times of the plurality of first signals and an interval of the sending times of the plurality of first signals, and adjust a timing advance according to the first parameter.

34. A communication device comprising a transceiver module, wherein the transceiver module is configured to:

and receiving first information, wherein the first information is used for indicating a first parameter, the first parameter is used for representing a relative value between intervals of a plurality of receiving times of a plurality of first signals and intervals of transmitting times of the plurality of first signals, the first parameter is determined according to the plurality of receiving times of the plurality of first signals and a first time length, one first signal corresponds to one receiving time, the one receiving time is the time when a terminal device receives the one first signal from the network device, and the transmitting period of the first signal transmitted by the network device to the terminal device is the first time length.

35. A computer readable storage medium storing computer instructions which, when run on a computer, cause the computer to perform the method of any one of claims 1-16.