Communication method and apparatus, and computer-readable storage medium

Abstract

Provided in the present application are a communication method and apparatus, and a computer-readable storage medium. The communication method comprises: sending first indication information, which indicates state information of current position information. By using the solution described above, a network device can know of state information of current position information of a terminal device, and can then adjust an operation type of uplink time-frequency synchronization of the terminal device, thereby ensuring that the terminal device can perform uplink data transmission in a normal manner.

Description

Communication method and device, and computer-readable storage medium

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on December 27, 2023, with application number 202311831070.7 and application name “Communication Method and Device, Computer-readable Storage Medium”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of wireless communication technologies, and in particular to a communication method and apparatus, and a computer-readable storage medium. Background Art

[0003] In satellite communication systems, satellites can reach altitudes ranging from hundreds to tens of thousands of kilometers, resulting in transmission delays far exceeding those in terrestrial communication systems. Furthermore, the high mobility of satellites in low-orbit satellite communication systems creates a significant Doppler effect, causing frequency deviation and delay variations to be much greater than in terrestrial communication systems.

[0004] To achieve time and frequency synchronization, terminal devices can use the Global Navigation Satellite System (GNSS) module for positioning and obtain their own location information. Terminal devices use this location information to perform uplink time and frequency synchronization. Given the instability of the GNSS system, when terminal devices are unable to obtain accurate location information in real time using the GNSS system, how to achieve data transmission becomes a challenge. Summary of the Invention

[0005] One of the purposes of the present application is to provide a communication method to ensure that a terminal device can perform uplink data transmission normally.

[0006] In a first aspect, the present application provides a communication method, comprising: sending first indication information, where the first indication information indicates status information of current location information.

[0007] The terminal device sends first indication information to the network device. Based on the first indication information, the network device can obtain status information of the current location information of the terminal device. The network device can schedule uplink time-frequency synchronization of the terminal device based on the status information of the current location information of the terminal device, thereby ensuring that the terminal device can normally transmit uplink data.

[0008] Optionally, the status information of the current location information of the terminal device includes: the current location information is in an unavailable state, or the first valid duration of the current location information.

[0009] The terminal device may inform the network device, through the first indication information, that the current location information is unavailable. Alternatively, the terminal device may inform the network device, through the first indication information, of the first validity period of the current location information. Thus, the network device may perform corresponding scheduling for the uplink time-frequency synchronization of the terminal device based on the content of the first indication information.

[0010] Optionally, the first indication information further indicates that the motion state of the terminal device is a stationary state, or that the validity period of the current location information is infinite.

[0011] When the terminal device is in a disconnected state, the terminal device can also inform the network device through the first indication information that it is currently in a stationary state, and the validity period of the latter's current location information is infinite. In this scenario, the terminal device can use the most recently used location information for uplink time and frequency synchronization, and the network device can also be informed that the terminal device uses the most recently used location information for uplink time and frequency synchronization.

[0012] Optionally, the sending of the first indication information includes: using a first uplink resource to send the first indication information.

[0013] Optionally, the terminal device may also obtain configuration information, where the configuration information is used to configure the first uplink resource.

[0014] Optionally, the first uplink resource may include any one of the following: a physical random access channel resource, an uplink control channel resource, and an uplink reference signal resource.

[0015] The terminal device may use the first uplink resource to send the first indication information. Upon receiving the first indication information, the network device may obtain the status information of the current location information of the terminal device, and further learn whether the current location information of the terminal device is available, or the first valid duration of the current location information of the terminal device.

[0016] Optionally, the first indication information is sent in at least one of the following ways: uplink control information, physical random access channel, uplink radio resource control parameter, uplink media access layer control element MAC CE.

[0017] Optionally, the terminal device may also obtain second indication information, where the second indication information indicates the operation type for uplink time-frequency synchronization.

[0018] The network device may send a second indication message to the terminal device, the second indication message indicating the type of operation for uplink time-frequency synchronization to be performed by the terminal device. The terminal device determines the type of operation for uplink time-frequency synchronization based on the acquired second indication message and performs the corresponding uplink time-frequency synchronization operation.

[0019] Optionally, the second indication information indicates that the current position information is used for uplink time and frequency synchronization before the second valid time duration times out, and the uplink synchronization adjustment indication information is used for uplink time and frequency synchronization after the second valid time duration times out or expires; or, the second indication information indicates that the uplink synchronization adjustment indication information is used for uplink time and frequency synchronization.

[0020] Optionally, the second indication information further indicates at least one of the following: the second effective duration, and the time domain starting position of the second effective duration.

[0021] Optionally, the time domain starting position of the second effective duration is the time domain ending position of the physical resource block carrying the second indication information; or, the time domain starting position of the second effective duration is determined by the time domain ending position and offset of the physical resource block carrying the second indication information.

[0022] Based on the second indication information, the terminal device can determine whether to use the uplink synchronization adjustment indication information for uplink time and frequency synchronization, or to use the current position information for uplink time and frequency synchronization; and the time to use the uplink synchronization adjustment indication information for uplink time and frequency synchronization, and the time to use the current position information for uplink time and frequency synchronization, so as to perform corresponding uplink time and frequency synchronization to ensure that the terminal device can perform uplink data transmission normally.

[0023] Optionally, the terminal device may also stop uplink data transmission before receiving the second indication information, thereby avoiding invalid uplink data transmission of the terminal device and reducing power consumption of the terminal device.

[0024] Optionally, the terminal device may also perform uplink time and frequency synchronization using uplink synchronization adjustment indication information in response to the first valid duration of the current location information reaching a preset duration threshold.

[0025] When the terminal device detects that the first valid duration of the current location information reaches the preset duration threshold, it can use the uplink synchronization adjustment instruction to perform uplink time and frequency synchronization. Thus, the terminal device can independently determine the type of operation for uplink time and frequency synchronization without the need for instructions from the network device.

[0026] Optionally, the terminal device may obtain uplink synchronization adjustment indication information in response to the first valid duration timing out or expiration; or, obtain third indication information in response to the first valid duration timing out or expiration; the third indication information indicates that the current position information is used for uplink time and frequency synchronization before the third valid duration times out, and the uplink synchronization adjustment indication information is used for uplink time and frequency synchronization after the third valid duration times out or expires.

[0027] The terminal device may also obtain the third indication information sent by the network device after the first valid duration times out or expires. The terminal device determines the specific operation type for uplink time and frequency synchronization based on the third indication information.

[0028] Optionally, the third indication information is further used to indicate at least one of the following: the third effective duration, and the time domain starting position of the third effective duration.

[0029] Optionally, the time domain starting position of the third effective duration is the time domain ending position of the physical resource block carrying the third indication information; or, the time domain starting position of the third effective duration is determined by the time domain ending position and offset of the physical resource block carrying the third indication information.

[0030] Optionally, the terminal device may also obtain the uplink synchronization adjustment indication information, where the uplink synchronization adjustment indication information includes time synchronization adjustment indication information and frequency synchronization adjustment indication information, and the time synchronization adjustment indication information includes a timing advance adjustment indication and an updated common timing advance parameter.

[0031] The network device can send uplink synchronization adjustment indication information to the terminal device. The terminal device performs uplink time and frequency synchronization based on the uplink synchronization adjustment indication information, thereby ensuring normal uplink data transmission of the terminal device.

[0032] Optionally, the terminal device may also determine that the latest acquired location information meets the uplink time and frequency synchronization requirements and send a fourth indication message.

[0033] Optionally, the terminal device may also use the latest acquired location information to perform uplink time and frequency synchronization.

[0034] When the terminal device detects that the latest acquired location information can meet the uplink time-frequency synchronization requirement, it can send fourth indication information to inform the network device that its latest acquired location information can meet the uplink time-frequency synchronization requirement. The terminal device can perform uplink time-frequency synchronization based on the latest acquired location information.

[0035] Optionally, the terminal device may further obtain fifth indication information, where the fifth indication information indicates that the latest obtained location information is used for uplink time and frequency synchronization.

[0036] After completing the transmission of the fourth indication information, the terminal device may also obtain the fifth indication information sent by the network device. The fifth indication information instructs the terminal device to use the newly obtained location information for uplink time and frequency synchronization. Thus, the terminal device can use the newly obtained location information for uplink time and frequency synchronization, ensuring that the terminal device can perform normal uplink data transmission.

[0037] In a second aspect, the present application provides another communication method, including: obtaining first indication information, where the first indication information indicates status information of current location information of a terminal device.

[0038] Optionally, the status information of the current location information of the terminal device includes: the current location information of the terminal device is in an unavailable state, or the first valid duration of the current location information of the terminal device.

[0039] Optionally, the first indication information sent by the terminal device may also indicate that the motion state of the terminal device is a stationary state, or that the validity period of the current location information of the terminal device is infinite.

[0040] Optionally, the network device may receive the first indication information sent by the terminal device on the first uplink resource.

[0041] Optionally, the network device may send configuration information to the terminal device, and configure the first uplink resource for the terminal device through the configuration information.

[0042] Optionally, the first uplink resource includes any one of the following: a physical random access channel resource, an uplink control channel resource, and an uplink reference signal resource.

[0043] Optionally, the first indication information is obtained in at least one of the following ways: uplink control information, physical random access channel, uplink radio resource control parameter, uplink media access layer control element MAC CE.

[0044] Optionally, the network device may further send a second indication message to the terminal device, where the second indication message indicates the operation type of the terminal device to perform uplink time and frequency synchronization.

[0045] Optionally, the second indication information instructs the terminal device to use the current location information for uplink time and frequency synchronization before the second valid time duration times out, and to use the uplink synchronization adjustment indication information for uplink time and frequency synchronization after the second valid time duration times out or expires; or, the second indication information instructs the terminal device to use the uplink synchronization adjustment indication information for uplink time and frequency synchronization.

[0046] Optionally, the second indication information further indicates at least one of the following: the second effective duration, and the time domain starting position of the second effective duration.

[0047] Optionally, the network device may indicate that the time domain starting position of the second effective duration is the time domain ending position of the physical resource block carrying the second indication information; or, the time domain starting position of the second effective duration is determined by the time domain ending position and offset of the physical resource block carrying the second indication information.

[0048] Optionally, after determining that the first effective duration has timed out or expired, the network device sends a third indication message to the terminal device, wherein the third indication message instructs the terminal device to use the current location information for uplink time and frequency synchronization before the third effective duration times out, and to use the uplink synchronization adjustment indication message for uplink time and frequency synchronization after the third effective duration times out or expires.

[0049] Optionally, the third indication information is further used to indicate at least one of the following: the third effective duration, and the time domain starting position of the third effective duration.

[0050] Optionally, the network device can configure the time domain starting position of the third effective duration to be the time domain ending position of the physical resource block carrying the third indication information; or, the time domain starting position of the third effective duration is determined by the time domain ending position and offset of the physical resource block carrying the third indication information.

[0051] Optionally, the network device may send uplink synchronization adjustment indication information, where the uplink synchronization adjustment indication information includes time synchronization adjustment indication information and frequency synchronization adjustment indication information, where the time synchronization adjustment indication information includes a timing advance adjustment indication and an updated common timing advance parameter.

[0052] Optionally, the network device may also obtain fourth indication information, where the fourth indication information indicates that the latest location information obtained by the terminal device meets the uplink time and frequency synchronization requirements.

[0053] Optionally, the network device may send a fifth indication message to the terminal device, instructing the terminal device to use the latest acquired location information for uplink time and frequency synchronization through the fifth indication message.

[0054] In a third aspect, the present application provides a communication device, including: a sending unit, configured to send first indication information, wherein the first indication information indicates status information of current location information.

[0055] In a fourth aspect, the present application provides another communication device, including: an acquisition unit, configured to acquire first indication information, wherein the first indication information indicates status information of current location information of a terminal device.

[0056] In a fifth aspect, the present application also provides a computer-readable storage medium, which is a non-volatile storage medium or a non-transient storage medium, on which a computer program is stored, and when the computer program is run by a processor, the steps of any of the above-mentioned communication methods are executed.

[0057] In a sixth aspect, the present application also provides another communication device, comprising a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and the processor executes the steps of any of the above-mentioned communication methods when running the computer program.

[0058] In a seventh aspect, an embodiment of the present application provides a computer program product, including a computer program, which implements any of the above-mentioned communication methods when executed by a computer.

[0059] In an eighth aspect, an embodiment of the present application provides a chip having a computer program stored thereon, and when the computer program is executed by the chip, it implements any of the communication methods described above.

[0060] In a possible implementation, the chip is a chip in a chip module. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] FIG1 is a schematic structural diagram of an existing satellite communication system;

[0062] FIG2 is a flow chart of a communication method according to an embodiment of the present application;

[0063] FIG3 is a schematic diagram of a timing relationship in an embodiment of the present application;

[0064] FIG4 is another schematic diagram of a timing relationship in an embodiment of the present application;

[0065] FIG5 is a flow chart of another communication method in an embodiment of the present application;

[0066] FIG6 is a flow chart of another communication method in an embodiment of the present application;

[0067] FIG7 is a flow chart of another communication method in an embodiment of the present application;

[0068] FIG8 is a schematic structural diagram of a communication device in an embodiment of the present application. DETAILED DESCRIPTION

[0069] Figure 1 shows a schematic diagram of the structure of an existing satellite communication system. Terminal devices can communicate with network equipment via satellite. In satellite communication systems, satellite altitudes can reach hundreds to tens of thousands of kilometers, resulting in significant transmission latency. For example, at a geosynchronous orbit altitude of approximately 35,786 kilometers, the transmission latency between the satellite and the terminal device can exceed 100 milliseconds.

[0070] In low-Earth orbit satellite scenarios, the high mobility of satellites creates a significant Doppler effect, causing frequency deviation and delay variations to be much greater than those seen in terrestrial communication networks. For example, in LEO-600 (600km low-Earth orbit satellite) scenarios, satellite speeds can reach 7.56km / s. At low elevation angles, Doppler deviation can exceed 20ppm (parts per million).

[0071] In satellite communication systems, terminal devices use GNSS systems to obtain their own location information to achieve time and frequency synchronization. Terminal devices can also obtain satellite ephemeris information through messages broadcast by network devices. Based on this information, they can determine the satellite's position and velocity in real time. This allows them to calculate the distance and relative velocity between the terminal device and the satellite, and then estimate the transmission delay and Doppler frequency offset between the satellite and the terminal device.

[0072] However, GNSS systems do not always provide accurate positioning. In some scenarios, GNSS signal strength is poor or the system is not functioning properly. In such scenarios, the terminal device cannot obtain accurate real-time location information based on the GNSS system to achieve uplink time and frequency synchronization, which in turn affects the terminal device's uplink data transmission.

[0073] In an embodiment of the present application, a terminal device sends first indication information to a network device. Based on the first indication information, the network device can obtain status information about the current location information of the terminal device. The network device can schedule uplink time-frequency synchronization of the terminal device based on the status information about the current location information of the terminal device, thereby ensuring that the terminal device can perform normal uplink data transmission.

[0074] In order to make the above-mentioned objectives, features and beneficial effects of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0075] The terminal device described in the embodiments of the present application is a device with wireless communication capabilities, and may also be referred to as a terminal, mobile station (MS), mobile terminal (MT), access terminal equipment, vehicle-mounted terminal equipment, industrial control terminal equipment, user equipment (UE), UE unit, UE station, mobile station, remote station, remote terminal equipment, mobile device, wireless communication device, UE agent, or UE device. The UE can be fixed or mobile. It should be noted that the UE can support at least one wireless communication technology, such as LTE, NR, etc. Exemplarily, the UE may be a mobile phone, a tablet computer, a desktop computer, a laptop computer, an all-in-one computer, an in-vehicle terminal, a virtual reality (VR) UE, an augmented reality (AR) UE, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a wearable device, a UE in a future mobile communication network, or a UE in a future evolved public mobile land network (PLMN), etc. In some embodiments of the present application, the UE may also be a device with transceiver functions, such as a chip system, wherein the chip system may include a chip and may also include other discrete devices.

[0076] In the embodiment of the present application, a network device is a device that provides wireless communication functions for a terminal device, and may also be referred to as a radio access network (RAN) device, an access network element, an access network device, etc. The network device may support at least one wireless communication technology, such as LTE, NR, etc. For example, the network device includes, but is not limited to: a next-generation base station (gNB) in 5G, an evolved node B (eNB), a radio network controller (RNC), a node B (NB), a base station controller (BSC), a base transceiver station (BTS), a home base station (e.g., home evolved node B, or home node B, HNB), a baseband unit (BBU), a transmitting and receiving point (TRP), a transmitting point (TP), a mobile switching center, etc. The network device may also be a wireless controller, a centralized unit (CU), and / or a distributed unit (DU) in a cloud radio access network (CRAN) scenario, or the network device may be a relay station, an access point, an on-board device, a terminal device, a wearable device, a network device in future mobile communications, or a network device in a future evolved PLMN. In some embodiments, the network device may also be a device that provides wireless communication functions for a terminal device, such as a chip system. For example, the chip system may include a chip and may also include other discrete devices.

[0077] In some embodiments, the network device may also communicate with an Internet Protocol (IP) network, such as the Internet, a private IP network, or other data networks.

[0078] An embodiment of the present application provides a communication method, which is described in detail below through specific steps with reference to FIG2 .

[0079] In a specific implementation, the communication method provided in steps 200 to 201 below can be executed by a chip (such as a baseband chip) with data processing capabilities in the terminal device, or by a chip module with data processing capabilities in the terminal device, or by the terminal device. The following description takes the terminal device executing the communication method as an example.

[0080] Step 201: The terminal device sends first indication information, where the first indication information indicates status information of current location information. Correspondingly, the network device may receive the first indication information.

[0081] In the embodiment of the present application, before executing step 201, the terminal device may further execute step 200:

[0082] Step 200: The terminal device obtains current location information.

[0083] In an embodiment of the present application, a positioning system may be built into the terminal device, and the location information of the terminal device may be obtained through the positioning system. The location information of the terminal device may include the latitude and longitude information of the terminal device, the altitude information of the terminal device, etc.

[0084] In a specific implementation, the positioning system may include a GNSS system. Specifically, the GNSS system may include a Beidou satellite positioning system, a GPS positioning system, a Galileo positioning system, a Glonass positioning system, and the like.

[0085] In a specific implementation, the current location information of the terminal device may refer to the latest and accurate location information obtained by the terminal device when the GNSS system is available. The availability of the GNSS system may mean that the terminal device is able to obtain accurate location information through the GNSS system, or is able to obtain location information that meets time-frequency synchronization requirements through the GNSS system. Alternatively, the current location information of the terminal device may refer to the valid location information currently used by the terminal device, which is the latest location information obtained by the GNSS module before the current moment.

[0086] In the embodiment of the present application, the status information of the current location information may include: the current location information is in an unavailable state. That is, the first indication information may indicate that the current location information of the terminal device is in an unavailable state.

[0087] In a specific implementation, if the terminal device determines that the location information cannot be updated within a period of time, it can be determined that the current location information is in an unavailable state. Alternatively, if the terminal device determines that the signal strength of the GNSS system is poor within a period of time and may not be able to obtain location information or update location information, it can also be determined that the current location information is in an unavailable state.

[0088] In some embodiments, the aforementioned “period of time” may be pre-configured in the communication protocol. Alternatively, the aforementioned “period of time” may also depend on the interruption time of the GNSS system.

[0089] In specific applications, it can be known that when a terminal device resides in a cell, the state of the terminal device may include a non-connected state and a connected state, and the non-connected state may include a Radio Resource Control (RRC) idle state and an RRC inactive state.

[0090] In an embodiment of the present application, when the terminal device is in a non-connected state, the terminal device can use the first uplink resource to send the first indication information.

[0091] In a specific implementation, the network device may configure a first uplink resource for the terminal device. The first uplink resource may include any one of a physical random access channel resource (PRACH), an uplink control channel resource, an uplink reference signal resource, and the like.

[0092] Specifically, the network device can configure the first uplink resource for the terminal device through high-layer signaling, downlink control information, etc.

[0093] In some embodiments, the network device may configure a specific first uplink resource for the terminal device. The terminal device may transmit first indication information based on the specific first uplink resource. Upon receiving the first indication information carried by the first uplink resource, the network device may determine that the current location information of the terminal device is unavailable.

[0094] For example, the network device configures a specific first uplink resource for the terminal device as: a first PRACH resource, the first PRACH resource including a random access channel opportunity (RACH Occasion, RO) and a random access preamble. The terminal device uses the first PRACH resource to send the first indication information. When the network device detects that the terminal device uses the first PRACH resource, it can determine that the current location information of the terminal device is unavailable.

[0095] In other embodiments, the network device can configure a first uplink resource and a second uplink resource for the terminal device, wherein: when the terminal device detects that the current location information is in an unavailable state, the first uplink resource is used for uplink data transmission; when the terminal device detects that the current location information is in an available state, the second uplink resource is used for uplink data transmission.

[0096] Thus, when the terminal device determines that the current location information is unavailable, the first indication information is sent using the first uplink resource. When the network device detects that the terminal device uses the first uplink resource for uplink data transmission, it can determine that the current location information of the terminal device is unavailable.

[0097] In an embodiment of the present application, when the terminal device is in a stationary state for a period of time, the location information of the terminal device will not be updated during the time period. Therefore, the terminal device can still use the current location information for uplink time and frequency synchronization during the time period.

[0098] In a specific implementation, the terminal device may also indicate, through the first indication information, that the motion state of the terminal device is a stationary state, or indicate that the validity period of the current location information of the terminal device is infinite.

[0099] In a specific implementation, the terminal device may also indicate, through the first indication information, that the motion state of the terminal device is a stationary state, or indicate that the validity period of the current location information of the terminal device is infinite.

[0100] In some embodiments, the network device may configure a specific second uplink resource for the terminal device. The terminal device may use the specific second uplink resource to carry the first indication information. When the network device detects that the terminal device uses the second uplink resource for uplink data transmission, it may determine that the terminal device is in a stationary state or that the validity period of the terminal device's current location information is infinite.

[0101] In a specific implementation, the second uplink resource may include any one of a PRACH resource, an uplink control channel resource, an uplink reference signal resource, and the like.

[0102] In an embodiment of the present application, when a terminal device is in a connected state, since the terminal device may be in a mobile state and considering that the GNSS system may be unstable, the current location information of the terminal device may be unavailable for a period of time. Since the uplink data transmission of the terminal device requires uplink time and frequency synchronization relying on the location information, when the terminal device detects that the current location information is unavailable, it may send a first indication message to the network device.

[0103] In a specific implementation, when the terminal device is in a connected state, the terminal device may send the first indication information in at least one of the following ways: uplink control information, physical random access channel, uplink radio resource control parameter, uplink media access layer control element (Medium Access Control Control Element, MAC CE).

[0104] In some embodiments, when a terminal device is in a connected state, the network device may configure a specific physical random access channel resource for the terminal device. The terminal device may send first indication information to the terminal device via the specific physical random access channel resource. Upon obtaining the first indication information sent by the terminal device via the specific PRACH resource, the network device may determine that the current location information of the terminal device is unavailable.

[0105] After the network device determines that the current location information of the terminal device is unavailable, it can send a second indication message to the terminal device. The second indication message can indicate the type of operation for uplink time-frequency synchronization to be performed by the terminal device. Upon receiving the second indication message, the terminal device can perform uplink time-frequency synchronization of the corresponding operation type, thereby enabling normal uplink data transmission.

[0106] In a specific implementation, the operation type of the terminal device performing uplink time and frequency synchronization may include any of the following: using uplink synchronization adjustment indication information to perform uplink time and frequency synchronization, and using location information to perform uplink time and frequency synchronization.

[0107] In an embodiment of the present application, the second indication information may instruct the terminal device to use the uplink synchronization adjustment indication information for uplink time-frequency synchronization. Upon receiving the second indication information, the terminal device may determine that the operation type for uplink time-frequency synchronization is: using the uplink synchronization adjustment indication information for uplink time-frequency synchronization.

[0108] Alternatively, the second indication information may instruct the terminal device to use the current position information for uplink time-frequency synchronization before the second effective duration times out, and to use the uplink synchronization adjustment indication information for uplink time-frequency synchronization after the second effective duration times out or expires. Upon receiving the second indication information, the terminal device can determine that the operation type for uplink time-frequency synchronization before the second effective duration times out is: using the current position information for uplink time-frequency synchronization; and the operation type for uplink time-frequency synchronization after the second effective duration times out is: using the uplink synchronization adjustment indication information for uplink time-frequency synchronization.

[0109] In a specific implementation, the second indication information may further indicate the duration of the second effective duration. Upon receiving the second indication information, the terminal device may determine the duration of the second effective duration.

[0110] In some embodiments, the time domain location of the second effective duration can be preconfigured. For example, the time domain starting location of the preconfigured second effective duration is the time domain ending location of the physical resource block carrying the second indication information. Thus, upon receiving the second indication information, the terminal device can determine the duration and time domain location of the second effective duration.

[0111] 3 , a schematic diagram of a timing relationship in an embodiment of the present application is provided.

[0112] In Figure 3, at time T1, the terminal device determines that the current location information is unavailable, generates a first indication message, and sends the first indication message to the network device. At time T2, the terminal device receives the second indication message, from which it obtains the second effective duration as T0. The default starting position of the second effective duration is the time domain end position of the physical resource block carrying the second indication information (i.e., time T2).

[0113] Based on the second indication information, the terminal device uses the current location information to perform uplink time and frequency synchronization before the second valid time length times out (that is, within T2 to T3); after the second valid time length times out (that is, after T3), the terminal device uses the uplink synchronization adjustment indication information to perform uplink time and frequency synchronization.

[0114] In other embodiments, the second indication information may indicate the duration of the second effective duration and the time domain starting position of the second effective duration.

[0115] Specifically, the time domain starting position of the second effective duration may be: the time domain ending position of the physical resource block carrying the second indication information. Alternatively, the time domain starting position of the second effective duration may be determined by the time domain ending position of the physical resource block carrying the second indication information and an offset.

[0116] 4 , another timing relationship diagram in an embodiment of the present application is provided.

[0117] In Figure 4, at time T1, the terminal device determines that the current location information is unavailable, generates a first indication message, and sends the first indication message to the network device. At time T2, the terminal device receives a second indication message, from which it obtains the second validity duration as T0. The second indication message also indicates an offset.

[0118] Based on the second indication information, the terminal device determines that the time domain starting position of the second effective duration is T3 (i.e., T2+offset). Before the second effective duration times out (i.e., between T3 and T4), the terminal device uses the current position information to perform uplink time and frequency synchronization; after the second effective duration times out (i.e., after T4), the terminal device uses the uplink synchronization adjustment indication information to perform uplink time and frequency synchronization.

[0119] In an embodiment of the present application, the uplink synchronization adjustment indication information sent by the network device may include: time synchronization adjustment indication information and frequency synchronization adjustment indication information. The time synchronization adjustment indication information may include a timing advance adjustment indication and an updated common timing advance (TA) parameter. The new common TA parameter is used to indicate the round trip time (RTT) between the satellite and a ground reference point.

[0120] In specific applications, it can be known that when the terminal device performs uplink data transmission, the uplink timing advance can be determined by the following formula: T TA =(N TA +N TA,UE-specific +N TA,common +N TA,offset )×T s ;

[0121] In the above formula, N TA N is the TA adjustment value indicated by the TA command; TA,UE-specific N is the RTT of the service link calculated by the terminal device based on the location information and ephemeris information; TA,common The public TA parameter indicated by the network device, that is, the RTT between the satellite and the ground reference point, is estimated by the terminal device based on the public TA parameter and the reference time; N TA,offset is a fixed offset value in the existing protocol. TA 、N TA,UE-specific 、N TA,common The calculation process of etc. can refer to the existing protocol and will not be described here.

[0122] In the embodiment of the present application, the terminal device determines the uplink timing advance T based on the time synchronization adjustment indication information. TA For: T TA =(N TA +N TA,common, new+N TA,offset )×T s ;

[0123] Among them, N TA,common, new is the updated public TA parameter configured by the network device for the terminal device.

[0124] In a specific implementation, the network device may send time synchronization adjustment indication information and frequency synchronization adjustment indication information to the terminal device through the same signaling.

[0125] Specifically, the network device can configure time synchronization adjustment indication information and frequency synchronization adjustment indication information for the terminal device through high-layer signaling (such as RRC signaling); or, the network device can configure time synchronization adjustment indication information and frequency synchronization adjustment indication information for the terminal device through downlink control information (DCI) or physical downlink control channel (PDCCH) order; or, the network device can configure time synchronization adjustment indication information and frequency synchronization adjustment indication information for the terminal device through MAC CE.

[0126] In a specific implementation, the network device may also send time synchronization adjustment indication information and frequency synchronization adjustment indication information to the terminal device respectively through different signaling.

[0127] Specifically, the network device can configure time synchronization adjustment indication information for the terminal device through high-layer signaling (such as RRC signaling); or, the network device can configure time synchronization adjustment indication information for the terminal device through downlink control information (DCI) or PDCCH order; or, the network device can configure time synchronization adjustment indication information for the terminal device through MAC CE.

[0128] Accordingly, the network device may configure frequency synchronization adjustment indication information for the terminal device through high-layer signaling (such as RRC signaling); or, the network device may configure frequency synchronization adjustment indication information for the terminal device through downlink control information (DCI) or PDCCH order; or, the network device may configure frequency synchronization adjustment indication information for the terminal device through MAC CE.

[0129] In an embodiment of the present application, the status information of the current location information of the terminal device may also include: the first valid duration of the current location information of the terminal device.

[0130] In a specific implementation, when the terminal device detects that the first valid duration of the current location information reaches a preset duration threshold, it can be determined that the current location information is invalid (i.e., in an unavailable state). In this scenario, the terminal device can use the uplink synchronization adjustment indication information to perform uplink time and frequency synchronization.

[0131] When the network device obtains the first indication information, it can obtain the first effective duration of the current location information of the terminal device. After detecting that the first effective duration has timed out or expired (that is, the first effective duration has reached a preset duration threshold), the network device can send uplink synchronization adjustment indication information to the terminal device. The terminal device performs uplink time and frequency synchronization based on the received uplink synchronization adjustment indication information.

[0132] That is to say, the terminal device can autonomously trigger the operation type of switching uplink time and frequency synchronization without the need for instructions from the network device.

[0133] In a specific implementation, after detecting that the first effective duration has timed out or expired (i.e., the first effective duration has reached a preset duration threshold), the network device may also generate and send third indication information to the terminal device. The third indication information may indicate that the current location information should be used for uplink time and frequency synchronization before the third effective duration times out, and that the uplink synchronization adjustment indication information should be used for uplink time and frequency synchronization after the third effective duration times out or expires.

[0134] Therefore, the terminal device can also switch the operation type of uplink time and frequency synchronization based on the instructions of the network device.

[0135] In some embodiments, the third indication information may be used to indicate: a third effective duration and a time domain starting position of the third effective duration. The time domain starting position of the third effective duration may be: the time domain ending position of the physical resource block carrying the third indication information. Alternatively, the time domain starting position of the third effective duration may be determined by the time domain ending position of the physical resource block carrying the third indication information and an offset. The offset may be carried in the third indication information, carried by separate signaling, or may be a preconfigured value.

[0136] In a specific implementation, the method for determining the time domain position of the third effective duration can refer to the method for determining the time domain position of the second effective duration provided in the above embodiment, and will not be described in detail here.

[0137] In the embodiment of the present application, when the terminal device determines that the latest acquired location information meets the uplink time-frequency synchronization requirement, the terminal device can use the latest acquired location information for uplink time-frequency synchronization. Thus, the terminal device can autonomously switch the operation type of uplink time-frequency synchronization.

[0138] As described in the above embodiment, when the location information of the terminal device is unavailable for a period of time, the terminal device can use the uplink synchronization adjustment indication information to perform uplink time and frequency synchronization. When the terminal device determines that the latest acquired location information meets the uplink time and frequency synchronization requirements, it can use the latest acquired location information to perform uplink time and frequency synchronization, thereby achieving the switching of the operation type of uplink time and frequency synchronization.

[0139] For example, between t0 and t1, the terminal device determines that the location information is unavailable, and the terminal device uses the uplink synchronization adjustment indication information to perform uplink time and frequency synchronization. At t1, the terminal device determines that the latest location information obtained meets the uplink time and frequency synchronization requirements, and uses the latest location information to perform uplink time and frequency synchronization.

[0140] In an embodiment of the present application, when the terminal device determines that the newly acquired location information meets the uplink time-frequency synchronization requirement, the terminal device may send fourth indication information to the network device. The terminal device may send the fourth indication information to the network device through uplink control information, PRACH, uplink RRC parameters, uplink MAC CE, etc.

[0141] In a specific implementation, the fourth indication information can be used to indicate that the terminal device's most recently acquired location information meets the uplink time-frequency synchronization requirement. Upon receiving the fourth indication information, the network device can determine that the terminal device's most recently acquired location information meets the uplink time-frequency synchronization requirement. The network device can generate fifth indication information, which can instruct the terminal device to use the most recently acquired location information for uplink time-frequency synchronization. Upon obtaining the fifth indication information, the terminal device can use the most recently acquired location information for uplink time-frequency synchronization.

[0142] In some embodiments, the network device may be carried by any one of MAC CE, DCI, physical downlink control channel (PDCCH) order, timing advance (TA) command, etc.

[0143] 5 , another communication method in an embodiment of the present application is provided, and the technical solution in the embodiment of the present application is described through the interaction process between the terminal device and the network device.

[0144] Step 501: The terminal device obtains current location information.

[0145] Step 502: The terminal device sends first indication information.

[0146] Specifically, the terminal device may send the first indication information to the network device, and correspondingly, the network device receives the first indication information.

[0147] In a specific implementation, the first indication information may indicate that the current location information of the terminal device is in an unavailable state.

[0148] Step 503: The network device sends second indication information.

[0149] In a specific implementation, the network device receives the first indication information and can determine that the current location information of the terminal device is in an unavailable state. The network device can send a second indication information, which can indicate the operation type of the terminal device to perform uplink time and frequency synchronization.

[0150] Specifically, the network device may send the second indication information to the terminal device, and correspondingly, the terminal device may receive the second indication information.

[0151] Step 504: The terminal device performs uplink time and frequency synchronization.

[0152] In a specific implementation, the terminal device can determine whether to use the uplink synchronization adjustment indication information or the location information to perform uplink time and frequency synchronization after obtaining the second indication information. The terminal device can determine the operation type of performing uplink time and frequency synchronization based on the second indication information.

[0153] Specifically, the operation type of the terminal device performing uplink time and frequency synchronization can refer to the description in the above steps 200 to 201.

[0154] Step 505: The terminal device sends fourth indication information.

[0155] In a specific implementation, the terminal device may send the fourth indication information to the network device. Correspondingly, the network device receives the fourth indication information sent by the terminal device.

[0156] Step 506: The network device sends fifth indication information.

[0157] In a specific implementation, the network device may send fifth indication information to the terminal device, and the fifth indication information may instruct the terminal device to use the latest acquired location information for uplink time and frequency synchronization. Accordingly, the terminal device may receive the fifth indication information sent by the network device.

[0158] Step 507: The terminal device uses the latest acquired location information to perform uplink time and frequency synchronization.

[0159] In a specific implementation, when the terminal device obtains the fifth indication information, it can use the latest obtained location information to perform uplink time and frequency synchronization.

[0160] 6 , another communication method in an embodiment of the present application is provided. The difference from FIG. 5 is that after completing step 504, the following steps are performed:

[0161] Step 605: The terminal device uses the latest acquired location information to perform uplink time and frequency synchronization.

[0162] That is to say, after the terminal device determines that the latest acquired location information meets the uplink time and frequency synchronization requirements, it can independently determine to use the latest acquired location information for uplink time and frequency synchronization without the need for instructions from the network device.

[0163] 7 , another communication method in an embodiment of the present application is provided.

[0164] Step 701: The terminal device obtains current location information.

[0165] Step 702: The terminal device sends first indication information.

[0166] In a specific implementation, the first indication information may indicate the first valid duration of the current location information of the terminal device.

[0167] Step 703: The network device sends third indication information.

[0168] In a specific implementation, the network device may send the third indication information to the terminal device. Correspondingly, the terminal device may receive the third indication information sent by the network device.

[0169] In a specific implementation, after detecting that the first effective duration has timed out or expired (ie, the first effective duration has reached a preset duration threshold), the network device may generate third indication information and send it to the terminal device.

[0170] Step 704: The terminal device performs uplink time and frequency synchronization.

[0171] In a specific implementation, the terminal device can determine the operation type of performing uplink time-frequency synchronization based on the third indication information, and perform corresponding uplink time-frequency synchronization.

[0172] Step 705: The terminal device uses the latest acquired location information to perform uplink time and frequency synchronization.

[0173] That is to say, after the terminal device determines that the latest acquired location information meets the uplink time and frequency synchronization requirements, it can independently determine to use the latest acquired location information for uplink time and frequency synchronization without the need for instructions from the network device.

[0174] 8 , a communication device 80 according to an embodiment of the present application is provided, including a sending unit 801 , wherein:

[0175] The sending unit 801 is configured to send first indication information, where the first indication information indicates status information of current location information.

[0176] In a specific implementation, the communication device 80 may further include an acquisition unit 800 for acquiring current location information.

[0177] In a specific implementation, the specific execution process of the acquisition unit 800 and the sending unit 801 may correspond to steps 200 to 201 and will not be described in detail here.

[0178] In a specific implementation, the above-mentioned communication device 80 may correspond to a chip with a data processing function in a terminal device, or to a chip module with a data processing function in a terminal device, or to a terminal device.

[0179] In specific implementations, the modules / units included in the various devices and products described in the above embodiments may be software modules / units or hardware modules / units, or may be partially software modules / units and partially hardware modules / units.

[0180] For example, for each device or product applied to or integrated into a chip, each module / unit contained therein may be implemented in the form of hardware such as circuits, or at least some of the modules / units may be implemented in the form of software programs, which run on a processor integrated inside the chip, and the remaining (if any) modules / units may be implemented in the form of hardware such as circuits; for each device or product applied to or integrated into a chip module, each module / unit contained therein may be implemented in the form of hardware such as circuits, and different modules / units may be located in the same component (such as a chip, circuit module, etc.) or different components of the chip module, or at least some of the modules / units may be implemented in the form of software programs. The element can be implemented in the form of a software program, which runs on the processor integrated inside the chip module, and the remaining (if any) modules / units can be implemented in the form of hardware such as circuits; for various devices and products applied to or integrated in the terminal, the various modules / units contained therein can be implemented in the form of hardware such as circuits, and different modules / units can be located in the same component (for example, chip, circuit module, etc.) or different components in the terminal, or, at least some modules / units can be implemented in the form of a software program, which runs on the processor integrated inside the terminal, and the remaining (if any) modules / units can be implemented in the form of hardware such as circuits.

[0181] An embodiment of the present application further provides a computer-readable storage medium, which is a non-volatile storage medium or a non-transient storage medium, on which a computer program is stored. When the computer program is run by a processor, it executes the communication method provided in any of the above embodiments.

[0182] An embodiment of the present application also provides another communication device, including a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and when the processor runs the computer program, it executes the communication method provided in any of the above embodiments.

[0183] An embodiment of the present application also provides a computer program product, including a computer program. When the computer program is executed by a processor, it can implement the method shown in the above method embodiment.

[0184] An embodiment of the present application provides a chip having a computer program stored thereon. When the computer program is executed by the chip, the communication method provided in any of the above embodiments is implemented.

[0185] An embodiment of the present application provides a chip module having a computer program stored thereon. When the computer program is executed by the chip module, the communication method provided in any of the above embodiments is implemented.

[0186] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium, which may include: Read-Only Memory (ROM), Random Access Memory (RAM), a disk or an optical disk, etc.

[0187] Although the present application is disclosed as above, the present application is not limited thereto. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be based on the scope defined by the claims.

Claims

1. A communication method, characterized in that, Including: Sending first indication information, where the first indication information indicates status information of current location information.

2. The communication method according to claim 1, wherein The status information of the current location information includes: the current location information is in an unavailable state, or a first valid duration of the current location information.

3. The communication method according to claim 1 or 2, characterized in that, The first indication information further indicates that the motion state of the terminal device is a stationary state, or the validity period of the current location information is infinite.

4. The communication method according to any one of claims 1 to 3, characterized in that The sending of the first indication information includes: Using a first uplink resource to send the first indication information.

5. The communication method according to claim 4, wherein Further including: Obtaining configuration information, where the configuration information is used to configure the first uplink resource.

6. The communication method according to claim 5, wherein The first uplink resource includes any one of the following: a physical random access channel resource, an uplink control channel resource, an uplink reference signal resource.

7. The communication method according to claim 1, wherein Sending the first indication information in at least one of the following ways: uplink control information, a physical random access channel, uplink radio resource control parameters, an uplink media access control element MAC CE.

8. The communication method according to claim 7, wherein Further including: Obtaining second indication information, where the second indication information indicates an operation type for uplink time-frequency synchronization.

9. The communication method according to claim 8, wherein The second indication information indicates using the current location information for uplink time-frequency synchronization before a second valid duration expires, and using uplink synchronization adjustment indication information for uplink time-frequency synchronization after the second valid time duration expires or elapses; or, the second indication information indicates using the uplink synchronization adjustment indication information for uplink time-frequency synchronization.

10. The communication method according to claim 9, characterized in that, The second indication information further indicates at least one of the following: the second valid duration, a time-domain start position of the second valid duration.

11. The communication method according to claim 10, wherein The time-domain start position of the second valid duration is the time-domain end position of a physical resource block carrying the second indication information; or, the time-domain start position of the second valid duration is determined by the time-domain end position of the physical resource block carrying the second indication information and an offset.

12. The communication method according to claim 8, wherein Further including: Before receiving the second indication information, stopping uplink data transmission.

13. The communication method according to claim 2, wherein Further including: In response to the first valid duration of the current location information reaching a preset duration threshold, using uplink synchronization adjustment indication information for uplink time-frequency synchronization.

14. The communication method according to claim 2, characterized in that, Further including: In response to the first valid duration expiring or elapsing, obtaining uplink synchronization adjustment indication information; Or, In response to the first valid duration expiring or elapsing, obtaining third indication information; the third indication information indicates using the current location information for uplink time-frequency synchronization before a third valid duration expires, and using uplink synchronization adjustment indication information for uplink time-frequency synchronization after the third valid duration expires or elapses.

15. The communication method according to claim 14, wherein The third indication information is further used to indicate at least one of the following: the third valid duration, a time-domain start position of the third valid duration.

16. The communication method according to claim 15, wherein The time-domain start position of the third valid duration is the time-domain end position of a physical resource block carrying the third indication information; or, the time-domain start position of the third valid duration is determined by the time-domain end position of the physical resource block carrying the third indication information and an offset.

17. The communication method according to any one of claims 9-11 and 13-16, characterized in that Further including: Obtain the uplink synchronization adjustment indication information, where the uplink synchronization adjustment indication information includes time synchronization adjustment indication information and frequency synchronization adjustment indication information, and the time synchronization adjustment indication information includes a timing advance adjustment indication and an updated common timing advance parameter.

18. The communication method according to claim 1, wherein Further included is: Determine that the latest obtained location information meets the uplink time-frequency synchronization requirements, and send a fourth indication information.

19. The communication method according to claim 18, wherein Further included is: Perform uplink time-frequency synchronization using the latest obtained location information.

20. The communication method according to claim 19, wherein Further included is: Obtain a fifth indication information, where the fifth indication information indicates to perform uplink time-frequency synchronization using the latest obtained location information.

21. A communication method, characterized in that, Included is: Obtain a first indication information, where the first indication information indicates the status information of the current location information of the terminal device.

22. The method according to claim 21, wherein The status information of the current location information includes: the current location information is in an unavailable state, or the first effective duration of the current location information.

23. The communication method according to claim 21 or 22, characterized in that, The first indication information further indicates that the motion state of the terminal device is a stationary state, or the validity period of the current location information is infinite.

24. The communication method according to any one of claims 21-23, characterized in that, The obtaining of the first indication information includes: Receive the first indication information on a first uplink resource.

25. The communication method according to claim 24, characterized in that, Further included is: Send configuration information, where the configuration information is used to configure the first uplink resource.

26. The communication method according to claim 25, wherein The first uplink resource includes any one of the following: a physical random access channel resource, an uplink control channel resource, an uplink reference signal resource.

27. The communication method according to claim 21, wherein Obtain the first indication information by using at least one of the following methods: uplink control information, a physical random access channel, an uplink radio resource control parameter, an uplink media access control element MAC CE.

28. The communication method according to claim 27, wherein Further included is: Send a second indication information, where the second indication information indicates the operation type of the terminal device for uplink time-frequency synchronization.

29. The communication method according to claim 28, wherein The second indication information indicates to perform uplink time-frequency synchronization using the current location information before the expiration of a second effective duration, and to perform uplink time-frequency synchronization using the uplink synchronization adjustment indication information after the expiration or due date of the second effective duration; or, the second indication information indicates to perform uplink time-frequency synchronization using the uplink synchronization adjustment indication information.

30. The communication method according to claim 29, wherein The second indication information further indicates at least one of the following: the second effective duration, the time domain start position of the second effective duration.

31. The communication method according to claim 30, characterized in that, The time domain start position of the second effective duration is the time domain end position of the physical resource block carrying the second indication information; or, the time domain start position of the second effective duration is determined by the time domain end position of the physical resource block carrying the second indication information and an offset.

32. The communication method according to claim 22, wherein Further included is: In response to the expiration or due date of the first effective duration, send the uplink synchronization adjustment indication information; Or, In response to the expiration or due date of the first effective duration, send a third indication information; the third indication information indicates that the terminal device performs uplink time-frequency synchronization using the current location information before the expiration of a third effective duration, and performs uplink time-frequency synchronization using the uplink synchronization adjustment indication information after the expiration or due date of the third effective duration.

33. The communication method according to claim 32, wherein The third indication information is further used to indicate at least one of the following: the third effective duration, the time domain start position of the third effective duration.

34. The communication method according to claim 33, wherein The time-domain start position of the third effective duration is the time-domain end position of the physical resource block carrying the third indication information; or, the time-domain start position of the third effective duration is determined by the time-domain end position of the physical resource block carrying the third indication information and an offset.

35. The communication method according to any one of claims 29-34, characterized in that, It further includes: Sending the uplink synchronization adjustment indication information, where the uplink synchronization adjustment indication information includes time synchronization adjustment indication information and frequency synchronization adjustment indication information, and the time synchronization adjustment indication information includes a timing advance adjustment indication and an updated common timing advance parameter.

36. The communication method according to claim 21, wherein It further includes: Obtaining fourth indication information, where the fourth indication information indicates that the position information newly obtained by the terminal device meets the uplink time-frequency synchronization requirement.

37. The communication method according to claim 36, wherein It further includes: Sending fifth indication information, where the fifth indication information indicates that the terminal device uses the newly obtained position information for uplink time-frequency synchronization.

38. A communication device, characterized in that, It includes: A sending unit, configured to send first indication information, where the first indication information indicates the status information of the current position information.

39. A communication device, characterized in that, It includes: An obtaining unit, configured to obtain first indication information, where the first indication information indicates the status information of the current position information of the terminal device.

40. A computer-readable storage medium, the computer-readable storage medium being a non-volatile storage medium or a non-transitory storage medium, having a computer program stored thereon, characterized in that, When the computer program is run by a processor, it executes the steps of the communication method according to any one of claims 1-20; or, executes the steps of the communication method according to any one of claims 21-37.

41. A communication device, comprising a memory and a processor, wherein a computer program that can run on the processor is stored on the memory, characterized in that When the processor runs the computer program, it executes the steps of the communication method according to any one of claims 1-20; or, executes the steps of the communication method according to any one of claims 21-37.

42. A computer program product, characterized in that, It includes a computer program, which, when executed by a computer, implements the communication method according to any one of claims 1-20, or the communication method according to any one of claims 21-37.

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