Parameter determination method and device

Abstract

The invention discloses a parameter determination method and device, and the method comprises the steps: a terminal device in a satellite communication system can determine a second parameter according to first information and a first parameter after receiving the first information; wherein the first information can be used for indicating an association relationship between the first parameter and the second parameter. The first parameter is a parameter related to first satellite coverage, and the second parameter is a parameter related to second satellite coverage. The first satellite is a satellite providing service for the terminal device, and the second satellite is a satellite about to provide service for the terminal device. Through the method, the terminal device can determine the second parameter according to the first parameter after receiving the first information used for indicating the association relationship between the first parameter and the second parameter, so that the second parameter does not need to be obtained from the first satellite or the second parameter is determined by actually measuring the signal of the second satellite; and thus, the energy consumption required for obtaining the second parameter can be reduced.

Description

Parameter determination method and device Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a parameter determination method and device. Background Art

[0002] In mobile communication systems, such as new radio (NR) systems, non-terrestrial networks (NTNs) have been introduced. In NTNs, network equipment or some network equipment functions can be deployed on high-altitude platforms or satellites to provide seamless coverage for terminal devices. As satellites orbit the Earth, terminal devices also move relative to the satellites, which can cause terminal devices to move from the coverage area of ​​one satellite to the coverage area of ​​another. To ensure communication continuity and service quality, terminals need to perform cell handover or cell reselection.

[0003] In NTN, when performing cell handover or cell reselection, the terminal device needs to obtain parameters related to multiple satellite coverage. Optionally, the terminal device can obtain parameters related to multiple satellite coverage in one of the following ways.

[0004] Method 1: Parameters related to the coverage of each of the multiple satellites may include the coverage parameters of the satellite. The terminal device may obtain the coverage parameters of the serving satellite and neighboring satellites from the serving satellite. The coverage parameters of each satellite may include the satellite's ephemeris, the coverage area of ​​each beam of the satellite at a set time (e.g., the current time or a period after the current time), and the time period during which each beam of the satellite is within the coverage area.

[0005] Method 2: Parameters related to the coverage of each of the multiple satellites may include parameters obtained by measuring the signal of the satellite by a communication device within the coverage area of ​​the satellite, for example, the strength of the signal of the satellite measured by the communication device within the coverage area of ​​the satellite. The terminal device may obtain the coverage parameters of the serving satellite and the coverage parameters of the neighboring satellite from the serving satellite, and measure the signal of the serving satellite within the coverage area of ​​the serving satellite based on the coverage parameters of the serving satellite, and measure the signal of the neighboring satellite within the coverage area of ​​the neighboring satellite based on the coverage parameters of the neighboring satellite. This may determine parameters (for example, the strength of the signal of the serving satellite) obtained by measuring the signal of the serving satellite by the communication device within the coverage area of ​​the serving satellite, and parameters (for example, the strength of the signal of the neighboring satellite) obtained by measuring the signal of the neighboring satellite within the coverage area of ​​the neighboring satellite.

[0006] Currently, to obtain parameters related to multi-satellite coverage, a terminal device must obtain these parameters from a serving satellite and / or actually measure signals from multiple satellites, resulting in high power consumption. Furthermore, obtaining these parameters from a serving satellite also results in high overhead.

[0007] Summary of the Invention

[0008] The present application provides a parameter determination method and apparatus for reducing power consumption when a terminal device acquires satellite parameters.

[0009] In a first aspect, embodiments of the present application provide a parameter determination method. This method can be applied to a terminal device in a satellite communication system. The terminal device may receive first information indicating a correlation between a first parameter and a second parameter. The first parameter is related to the coverage of a first satellite, and the second parameter is related to the coverage of a second satellite. The first satellite is a satellite currently providing service to the terminal device, and the second satellite is a satellite that will soon provide service to the terminal device. The terminal device may then determine the second parameter based on the first information and the first parameter.

[0010] Optionally, the first parameter includes at least one of the following parameters: the ephemeris of the first satellite, the orbit of the first satellite, the coverage area of ​​each beam of the first satellite at a set time, the time period during which each beam of the first satellite covers each coverage area, and a parameter obtained by the communication device by measuring the signal of the first satellite within the coverage area of ​​the first satellite. The second parameter includes at least one of the following parameters: the ephemeris of the second satellite, the orbit of the second satellite, the coverage area of ​​each beam of the second satellite at a set time, the time period during which each beam of the second satellite covers each coverage area, and a parameter expected to be obtained by the communication device by measuring the signal of the second satellite within the coverage area of ​​the second satellite.

[0011] Through this method, after the terminal device receives the first information indicating the association between the first parameter and the second parameter, it can determine the second parameter related to the second satellite coverage based on the first parameter related to the first satellite coverage, thereby eliminating the need to obtain the second parameter from the first satellite or determine the second parameter by actually measuring the signal of the second satellite, thereby reducing the energy consumption required to obtain the second parameter.

[0012] In one possible design, the first information may include: a first time interval and a first indication. The first time interval is the difference between two moments in time. The first indication is used to indicate the aforementioned association relationship, including: the first value is less than or equal to a first threshold. The first value is determined based on the difference between two intensities. The two intensities include: the strength of a signal from a first satellite detected by a communication device located in a first area at one of the two moments in time, and the strength of a signal from a second satellite expected to be detected by a communication device located in the first area at the other of the two moments in time. The first area is an area within the coverage area of ​​the first satellite.

[0013] With this design, the first information received by the terminal device includes the first time interval and the first indication. Based on the first time interval and the first indication, the terminal device can determine the correlation between the first strength of the signal detected from the first satellite and the second strength of the signal expected to be detected from the second satellite. This eliminates the need for the terminal device to obtain coverage information for the second satellite from the first satellite; instead, it can determine the second strength based on the first strength and the first information. This reduces the power consumption and overhead required to obtain the second strength.

[0014] In one possible design, the first parameter includes a first strength of a signal from a first satellite detected by the terminal device at a first moment. The terminal device may determine, based on the first time interval and the first strength, a second strength of a signal from a second satellite that the terminal device is expected to detect at a second moment. The difference between the second moment and the first moment is the first time interval.

[0015] Through this design, the terminal device can determine the second strength of the expected detected signal from the second satellite based on the first strength and first information of the detected signal from the first satellite, thereby eliminating the need to obtain the coverage information of the second satellite from the first satellite for measurement, and eliminating the need to actually measure the signal from the second satellite, thereby reducing the power consumption and overhead required to obtain the second strength.

[0016] In one possible design, the first information further includes a first offset. The first offset may be used to indicate an offset between the two intensities. The terminal device may determine the second intensity based on the first time interval, the first intensity, and the first offset. With this design, the terminal device may accurately determine the expected second intensity of the signal from the second satellite based on the first intensity of the signal detected from the first satellite and the first offset, thereby improving the accuracy of the predicted second intensity.

[0017] In one possible design, the first information includes: a second time interval and a second indication. The second time interval is the difference between two moments. The second indication is used to indicate the association relationship, including: the second value is less than or equal to a second threshold. The second value is a value determined based on the difference between two frequency offsets. The two frequency offsets include: a frequency offset of a signal from the first satellite detected by a communication device located in the second area at one of the two moments, and a frequency offset of a signal from the second satellite expected to be detected by a communication device located in the second area at the other of the two moments. The second area is an area within the coverage area of ​​the first satellite.

[0018] With this design, the first information received by the terminal device includes the second time interval and the second indication. Based on the second time interval and the second indication, the terminal device can determine the correlation between the first frequency offset of the signal detected from the first satellite and the second frequency offset of the signal expected to be detected from the second satellite. This eliminates the need for the terminal device to obtain parameters for determining the second frequency offset, such as the ephemeris and frequency compensation configuration of the second satellite, from the first satellite. Instead, the terminal device can determine the second frequency offset based on the first frequency offset and the first information. This reduces the power consumption and overhead required to obtain the parameters of the second satellite from the first satellite.

[0019] In one possible design, the first parameter includes a first frequency offset of a signal from the first satellite detected by the terminal device at a third time. The terminal device may determine a second frequency offset of a signal from the second satellite detected by the terminal device at a fourth time based on the second time interval and the first frequency offset. The difference between the fourth time and the third time is the second time interval.

[0020] With this design, a terminal device can determine the second frequency offset of a signal from a second satellite based on the first frequency offset and first information detected for the signal from the first satellite. This eliminates the need to obtain parameters such as the second satellite's ephemeris and frequency compensation configuration from the first satellite for determining the second frequency offset, thereby reducing the complexity of downlink synchronization for the terminal device. Furthermore, this design eliminates the need for the terminal device to search for the signal from the second satellite in the frequency and angle domains, thereby reducing the number of blind detections, lowering the search overhead in the frequency and angle domains when receiving signals from the second satellite, and lowering the energy consumption required to receive signals from the second satellite.

[0021] In one possible design, the first information further includes a second offset. The second offset indicates the offset between the two frequency offsets. The terminal device may determine the second frequency offset based on the second time interval, the first frequency offset, and the second offset. With this design, the terminal device can accurately determine the expected second frequency offset of the signal from the second satellite based on the first frequency offset and the second offset of the signal detected from the first satellite, thereby improving the accuracy of the predicted second frequency offset.

[0022] In one possible design, the first information includes: a third time interval and a third indication. The third time interval is at least one of the following: a difference between the expected start times of two time periods, a difference between the expected end times of the two time periods, or a difference between the expected end time of one of the two time periods and the expected start time of the other of the two time periods. The two time periods may include: a time period during which the first satellite covers the third area, and a time period during which the second satellite covers the third area. The third area is an area within the coverage area of ​​the first satellite. The third indication may be used to indicate that the association relationship includes: a third value being less than or equal to a third threshold. The third value is determined based on the difference between the first duration and the second duration, where the first duration is the duration of the time period during which the first satellite covers the third area, and the second duration is the duration of the time period during which the second satellite covers the third area.

[0023] With this design, the first information received by the terminal device may include the third time interval and the third indication. Based on the third time interval and the third indication, the terminal device can determine the correlation between the first time period during which the signal from the first satellite is detected and the second time period during which the signal from the second satellite is expected to be detected. This eliminates the need for the terminal device to obtain the coverage parameters of the second satellite from the first satellite; instead, the terminal device can determine the second time period based on the first time period and the first information, thereby reducing the overhead and power consumption of obtaining the coverage parameters of the second satellite.

[0024] In one possible design, the first parameter includes a first time period during which the terminal device detects a signal from the first satellite. The terminal device may determine a second time period during which the terminal device is expected to detect a signal from the second satellite based on the third time interval and the first time period.

[0025] With this design, the first information received by the terminal device may include the third time interval and the third indication. Based on the third time interval and the third indication, the terminal device can determine the correlation between the first time period during which the signal from the first satellite is detected and the second time period during which the signal from the second satellite is expected to be detected. This eliminates the need for the terminal device to obtain the coverage parameters of the second satellite from the first satellite; instead, the terminal device can determine the second time period based on the first time period and the first information, thereby reducing the overhead and power consumption of obtaining the coverage parameters of the second satellite.

[0026] In one possible design, the first information further includes a third offset. The third offset may be used to indicate an offset of the second duration relative to the first duration. The terminal device may determine the second time period based on the third time interval, the third offset, and the first time period. With this design, the terminal device may determine the first time period during which the signal from the first satellite was detected, the third time interval, and the third offset, and accurately determine the second time period during which the terminal device is expected to detect the signal from the second satellite, thereby improving the accuracy of the prediction of the second time period.

[0027] In a second aspect, embodiments of the present application provide a parameter determination method. This method can be applied to a satellite communication system. A first satellite can send first information to a terminal device. The first information indicates a correlation between a first parameter and a second parameter. The first parameter is related to the coverage of the first satellite, and the second parameter is related to the coverage of the second satellite. The first satellite is a satellite currently providing service to the terminal device, and the second satellite is a satellite that will soon provide service to the terminal device. The terminal device can then determine the second parameter based on the first information and the first parameter.

[0028] Optionally, the first parameter includes at least one of the following parameters: the ephemeris of the first satellite, the orbit of the first satellite, the coverage area of ​​each beam of the first satellite at a set time, the time period during which each beam of the first satellite covers each coverage area, and a parameter obtained by the communication device by measuring the signal of the first satellite within the coverage area of ​​the first satellite. The second parameter includes at least one of the following parameters: the ephemeris of the second satellite, the orbit of the second satellite, the coverage area of ​​each beam of the second satellite at a set time, the time period during which each beam of the second satellite covers each coverage area, and a parameter expected to be obtained by the communication device by measuring the signal of the second satellite within the coverage area of ​​the second satellite.

[0029] Through this method, after the terminal device receives the first information indicating the association between the first parameter and the second parameter, it can determine the second parameter related to the second satellite coverage based on the first parameter related to the first satellite coverage, thereby eliminating the need to obtain the second parameter from the first satellite or determine the second parameter by actually measuring the signal of the second satellite, thereby reducing the energy consumption required to obtain the second parameter.

[0030] In one possible design, the first information includes: a first time interval and a first indication. The first time interval is the difference between two moments in time. The first indication can be used to indicate that the aforementioned association relationship includes: the first value is less than or equal to a first threshold. The first value is determined based on the difference between two intensities. The two intensities include: the strength of a signal from a first satellite detected by a communication device located in a first area at one of the two moments in time, and the strength of a signal from a second satellite expected to be detected by a communication device located in the first area at the other of the two moments in time. The first area is an area within the coverage area of ​​the first satellite.

[0031] With this design, the first information received by the terminal device includes the first time interval and the first indication. Based on the first time interval and the first indication, the terminal device can determine the correlation between the first strength of the signal detected from the first satellite and the second strength of the signal expected to be detected from the second satellite. This eliminates the need for the terminal device to obtain coverage information for the second satellite from the first satellite; instead, it can determine the second strength based on the first strength and the first information. This reduces the power consumption and overhead required to obtain the second strength.

[0032] In one possible design, the first parameter includes a first strength of a signal from a first satellite detected by the terminal device at a first moment. The terminal device may determine, based on the first time interval and the first strength, a second strength of a signal from a second satellite that the terminal device is expected to detect at a second moment. The difference between the second moment and the first moment is the first time interval.

[0033] Through this design, the terminal device can determine the second strength of the expected detected signal from the second satellite based on the first strength and first information of the detected signal from the first satellite, thereby eliminating the need to obtain the coverage information of the second satellite from the first satellite for measurement, and eliminating the need to actually measure the signal from the second satellite, thereby reducing the power consumption and overhead required to obtain the second strength.

[0034] In one possible design, the first information further includes a first offset. The first offset may be used to indicate an offset between the two intensities. The terminal device may determine the second intensity based on the first time interval, the first intensity, and the first offset. With this design, the terminal device may accurately determine the expected second intensity of the signal from the second satellite based on the first intensity of the signal detected from the first satellite and the first offset, thereby improving the accuracy of the predicted second intensity.

[0035] In one possible design, the first information includes: a second time interval and a second indication. The second time interval is the difference between two moments. The second indication can be used to indicate that the aforementioned association relationship includes: the second value is less than or equal to a second threshold. The second value can be a value determined based on the difference between two frequency offsets. The two frequency offsets include: a frequency offset of a signal from the first satellite detected by a communication device located in the second area at one of the two moments, and a frequency offset of a signal from the second satellite expected to be detected by a communication device located in the second area at the other of the two moments. The second area is an area within the coverage area of ​​the first satellite.

[0036] With this design, the first information received by the terminal device includes the second time interval and the second indication. Based on the second time interval and the second indication, the terminal device can determine the correlation between the first frequency offset of the signal detected from the first satellite and the second frequency offset of the signal expected to be detected from the second satellite. This eliminates the need for the terminal device to obtain parameters for determining the second frequency offset, such as the ephemeris and frequency compensation configuration of the second satellite, from the first satellite. Instead, the terminal device can determine the second frequency offset based on the first frequency offset and the first information. This reduces the power consumption and overhead required to obtain the parameters of the second satellite from the first satellite.

[0037] In one possible design, the first parameter includes a first frequency offset of a signal from the first satellite detected by the terminal device at a third time. The terminal device may determine a second frequency offset of a signal from the second satellite detected by the terminal device at a fourth time based on the second time interval and the first frequency offset, where the difference between the fourth time and the third time is the second time interval.

[0038] With this design, a terminal device can determine the second frequency offset of a signal from a second satellite based on the first frequency offset and first information detected for the signal from the first satellite. This eliminates the need to obtain parameters such as the second satellite's ephemeris and frequency compensation configuration from the first satellite for determining the second frequency offset, thereby reducing the complexity of downlink synchronization for the terminal device. Furthermore, this design eliminates the need for the terminal device to search for the signal from the second satellite in the frequency and angle domains, thereby reducing the number of blind detections, lowering the search overhead in the frequency and angle domains when receiving signals from the second satellite, and lowering the energy consumption required to receive signals from the second satellite.

[0039] In one possible design, the first information further includes a second offset. The second offset indicates the offset between the two frequency offsets. The terminal device may determine the second frequency offset based on the second time interval, the first frequency offset, and the second offset. With this design, the terminal device can accurately determine the expected second frequency offset of the signal from the second satellite based on the first frequency offset and the second offset of the signal detected from the first satellite, thereby improving the accuracy of the predicted second frequency offset.

[0040] In one possible design, the first information includes: a third time interval and a third indication. The third time interval is at least one of the following: a difference between the expected start times of two time periods, a difference between the expected end times of the two time periods, or a difference between the expected end time of one of the two time periods and the expected start time of the other of the two time periods. The two time periods may include: a time period during which the first satellite covers the third area, and a time period during which the second satellite covers the third area. The third area is an area within the coverage area of ​​the first satellite. The third indication may be used to indicate that the aforementioned association relationship includes: the third value is less than or equal to a third threshold. The third value is determined based on the difference between the first duration and the second duration, where the first duration is the duration of the time period during which the first satellite covers the third area, and the second duration is the duration of the time period during which the second satellite covers the third area.

[0041] With this design, the first information received by the terminal device may include the third time interval and the third indication. Based on the third time interval and the third indication, the terminal device can determine the correlation between the first time period during which the signal from the first satellite is detected and the second time period during which the signal from the second satellite is expected to be detected. This eliminates the need for the terminal device to obtain the coverage parameters of the second satellite from the first satellite; instead, the terminal device can determine the second time period based on the first time period and the first information, thereby reducing the overhead and power consumption of obtaining the coverage parameters of the second satellite.

[0042] In one possible design, the first parameter includes a first time period during which the terminal device detects a signal from the first satellite. The terminal device may determine a second time period during which the terminal device is expected to detect a signal from the second satellite based on the third time interval and the first time period.

[0043] With this design, the first information received by the terminal device may include the third time interval and the third indication. Based on the third time interval and the third indication, the terminal device can determine the correlation between the first time period during which the signal from the first satellite is detected and the second time period during which the signal from the second satellite is expected to be detected. This eliminates the need for the terminal device to obtain the coverage parameters of the second satellite from the first satellite; instead, the terminal device can determine the second time period based on the first time period and the first information, thereby reducing the overhead and power consumption of obtaining the coverage parameters of the second satellite.

[0044] In one possible design, the first information further includes a third offset. The third offset indicates an offset of the second duration relative to the first duration. The terminal device may determine the second time period based on the third time interval, the third offset, and the first time period. With this design, the terminal device can determine the first time period during which the signal from the first satellite was detected, the third time interval, and the third offset, and accurately determine the second time period during which the terminal device is expected to detect the signal from the second satellite, thereby improving the accuracy of the prediction of the second time period.

[0045] In a third aspect, an embodiment of the present application provides a parameter determination device, comprising a unit for executing each step in the first aspect.

[0046] In a fourth aspect, an embodiment of the present application provides a parameter determination device, comprising at least one processing element and at least one storage element, wherein the at least one storage element is used to store programs and data, and the at least one processing element is used to read and execute the programs and data stored in the storage element, so that the method provided in the first aspect of the present application is implemented.

[0047] In a fifth aspect, an embodiment of the present application provides a communication system, comprising: a terminal device for executing the method provided in the first aspect, and a first satellite for sending first information to the terminal device.

[0048] In a sixth aspect, an embodiment of the present application further provides a computer program, which, when executed on a computer, enables the method provided in the first aspect to be implemented.

[0049] In a seventh aspect, an embodiment of the present application further provides a computer-readable storage medium, in which a computer program is stored. When the computer program is executed by a computer, the method provided in the first aspect is implemented.

[0050] In an eighth aspect, an embodiment of the present application further provides a chip, which is used to read a computer program stored in a memory, so that the method provided in the first aspect is implemented.

[0051] In a ninth aspect, embodiments of the present application further provide a chip system, comprising a processor configured to support a computer device in implementing the method provided in the first aspect. In one possible design, the chip system further comprises a memory configured to store programs and data necessary for the computer device. The chip system may be composed solely of a chip, or may include a chip and other discrete components.

[0052] The technical effects that can be achieved in any of the third to ninth aspects mentioned above can refer to the description of the technical effects that can be achieved in any possible design in the first aspect mentioned above, and the repetitions will not be discussed. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] FIG1A is a schematic diagram of an application scenario of a transparent transmission mode provided in an embodiment of the present application;

[0054] FIG1B is a schematic diagram of an application scenario of a regeneration mode provided in an embodiment of the present application;

[0055] FIG2A is an architecture diagram of a communication system provided in an embodiment of the present application;

[0056] FIG2B is an architecture diagram of another communication system provided in an embodiment of the present application;

[0057] FIG3 is a flow chart of a parameter determination method provided in an embodiment of the present application;

[0058] FIG4 is a schematic diagram of path loss related variables for different satellites in the same orbit according to an embodiment of the present application;

[0059] FIG5 is a structural diagram of a communication device provided in an embodiment of the present application;

[0060] FIG6 is a structural diagram of another communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0062] Below, some terms in this application are explained to facilitate understanding by those skilled in the art.

[0063] 1) Communication device generally refers to a device with communication function. For example, the communication device may be, but is not limited to, a terminal device, a network device, an access point, a relay device, etc.

[0064] 2) Network equipment is the equipment that connects terminal devices to wireless networks in mobile communication systems. Network equipment, as nodes in a radio access network (RAN), can also be called a base station, a radio access network (RAN) node (or device), an access point (AP), or an access network (AN) device.

[0065] Currently, some examples of network equipment include: new generation Node B (gNB), transmission reception point (TRP), evolved Node B (eNB), radio network controller (RNC), Node B (NB), base station controller (BSC), base transceiver station (BTS), transmitting and receiving point (TRP), transmitting point (TP), mobile switching center, home evolved NodeB (e.g., home NodeB, or home Node B, HNB), or base band unit (BBU), etc.

[0066] 3) A terminal device is a device that provides voice and / or data connectivity to users. A terminal device can be a terminal device or a chip that implements the functions of a terminal device. Terminal devices can also be referred to as user equipment (UE), terminal, access terminal, terminal unit, terminal station, mobile station (MS), remote station, remote terminal, mobile terminal (MT), wireless communication device, customer premise equipment (CPE), or terminal agent.

[0067] For example, the terminal device may be a handheld device with a wireless connection function, or a vehicle with a communication function, a vehicle-mounted device (such as a vehicle-mounted communication device, a vehicle-mounted communication chip), etc. Currently, some examples of terminal devices include: mobile phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, tablet computers, computers with wireless transceiver capabilities, laptop computers, PDAs, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in self-driving cars, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, etc.

[0068] 4) Quasi colocation (QCL): If the channel characteristics of one antenna port can be derived from the other antenna port, then the two ports are QCL. In other words, when two antenna ports are quasi colocated, the channel estimation result obtained from one antenna port can be applied to the other port; in other words, the pilot signals on the two antenna ports can reuse parameters.

[0069] 5), NTN communication:

[0070] NTN communications can utilize drones, high altitude platform stations (HAPS), satellites, and other equipment to form a network, providing data transmission, voice communication, and other services to terminal devices. High altitude platforms can be 8 to 50 kilometers (km) above the ground. Based on satellite altitude, or the height of the satellite's orbit, the satellite communication system in NTN communications can include geostationary Earth orbit (GEO), medium Earth orbit (MEO), and low Earth orbit (LEO) satellites. Each of these is described below.

[0071] 1. GEO Satellite: Also known as a geosynchronous satellite or geostationary satellite. GEO satellites move at the same speed as the Earth's rotation, thus remaining stationary relative to the Earth. Accordingly, the cells of GEO satellites are also stationary. GEO satellites orbit at a high altitude, for example, up to 35,786 km, providing a wide coverage area. The diameter of a GEO satellite cell is typically 500 km.

[0072] 2. MEO satellites are non-synchronous satellites. Asynchronous satellites move at a speed different from the Earth's rotation speed, and therefore appear to be in motion relative to the Earth. MEO satellites have orbital altitudes ranging from 2,000 to 35,786 km, enabling global coverage with a relatively small number of satellites. MEO satellites are primarily used for positioning and navigation.

[0073] 3. LEO satellites: These are another type of non-synchronous satellite. LEO satellites orbit at altitudes between 300 and 2000 km and offer advantages such as low data transmission latency, minimal transmission loss, and low launch costs. LEO satellites move relatively quickly relative to the ground, at approximately 7 km / s, so the coverage area they provide also moves.

[0074] In NTN communications, the operating modes of NTN equipment (eg, a high-altitude platform or a satellite, etc.) may include: a transparent mode and a regenerative mode.

[0075] NTN equipment has relay forwarding capabilities when operating in transparent transmission mode. For example, the transparent transmission mode application scenario can be shown in Figure 1A. In the application scenario shown in Figure 1A, the network equipment is set up on the ground and can be connected to the data network (DN) through the core network (CN); the satellite and gateway equipment can serve as the remote radio unit (RRU) of the network equipment, used to transmit information between the network equipment and the terminal device.

[0076] When operating in regeneration mode, NTN equipment has data processing capabilities and has all or part of the capabilities of a network device. For example, the application scenario of the regeneration mode can be shown in Figure 1B. In the application scenario shown in Figure 1B, the satellite can serve as a network device, form an access network with a gateway device, and communicate with the core network through the gateway device. For example, the satellite can serve as a network device and establish an N2 interface or Ng interface connection with the access and mobility management function (AMF) entity in the core network through the gateway device. In addition, the satellite can also provide wireless access services for terminal devices.

[0077] 6) In the present application, the parameters related to satellite coverage may be parameters related to the cell coverage of the satellite, parameters related to the synchronization signal block (SSB) sent by the satellite, parameters related to the beam sent by the satellite, and parameters related to the pilot port of the satellite.

[0078] 7) In this application, the strength of a satellite signal detected by a communication device may be the strength of a signal detected by the communication device that is greater than a signal strength threshold, or the strength of a first satellite signal detected by the communication device. The first signal is a signal sent by a satellite to the communication device. This application does not limit the strength range of the first signal.

[0079] 8) In the present application, the parameters used to reflect the signal strength may include but are not limited to at least one of the following: reference signal receiving power (RSRP), reference signal receiving quality (RSRQ), or received signal strength indication (RSSI).

[0080] 9) In this application, frequency deviation is used to characterize the amplitude of the frequency swing of the FM wave, and can be expressed by an absolute value or a relative value. When the frequency deviation is expressed by an absolute value, the frequency deviation can represent the frequency difference between the maximum frequency swing and the center frequency. In this case, the frequency deviation unit may include but is not limited to at least one of the following: Hertz (Hz), kilohertz (kHz). When the frequency deviation is expressed by a relative value, the frequency deviation can represent the relative relationship between the maximum frequency swing and the center frequency. In this case, the frequency deviation unit can be parts per million (ppm).

[0081] In this application, the amplitude of the FM wave frequency swing can also be represented by an angle. This angle can be the angle between the maximum frequency of the swing and the center frequency. Therefore, in this application, the frequency deviation can also be replaced by angle or Doppler information.

[0082] In the embodiments of the present application, the number of nouns, unless otherwise specified, means "singular noun or plural noun", that is, "one or more". "At least one" means one or more, and "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items.

[0083] In addition, it should be understood that, in the description of this application, words such as "first" and "second" are only used for the purpose of distinguishing the description, and should not be understood as indicating or implying relative importance, nor should they be understood as indicating or implying order.

[0084] Figure 2A shows the network architecture of a satellite communication system. In the system shown in Figure 2A, the NTN equipment operates in transparent transmission mode. Figure 2B shows the network architecture of another satellite communication system. In the system shown in Figure 2B, the NTN equipment operates in regeneration mode.

[0085] In the satellite communication system shown in Figure 2A or 2B, NTN devices and terrestrial network devices can be interconnected through the core network or through interfaces defined between network devices. For example, in NR, NTN devices and terrestrial network devices can be interconnected through Xn interfaces or NG interfaces. Xn interfaces are interfaces between network devices, while NG interfaces are interfaces between network devices and the core network.

[0086] Optionally, the link between the NTN device and the terminal device may be referred to as a service link, and the link between the NTN device and the gateway device may be referred to as a feeder link.

[0087] It should be noted that the communication system shown in FIG2A or FIG2B does not constitute a limitation on the communication system to which the embodiments of the present application can be applied. Therefore, the method provided in the embodiments of the present application can also be applied to communication systems of various standards. For example, the embodiments of the present application can be applied to the fourth generation mobile communication system (the fourth generation, 4G) system, the fifth generation (the 5th generation, 5G) communication system, NTN system, vehicle to everything (vehicle to everything, V2X), long-term evolution - vehicle network (LTE-vehicle, LTE-V), vehicle to vehicle (vehicle to vehicle, V2V), vehicle network, machine type communication (MTC), Internet of Things (IoT), long-term evolution - machine to machine (LTE-machine to machine, LTE-M), machine to machine (machine to machine, M2M), or future mobile communication systems. In addition, it should be noted that the embodiments of the present application do not limit the names of the network elements in the communication system. For example, in communication systems of different standards, each network element may have other names; for example, when multiple network elements are integrated into the same physical device, the physical device may also have other names.

[0088] As non-geostationary satellites orbit the Earth, terminal devices also move relative to the satellites, potentially causing them to move from the coverage area of ​​one satellite to the coverage area of ​​another. To ensure communication continuity and service quality, the terminal needs to perform cell handover or cell reselection. When performing cell handover or cell reselection, the terminal device needs to obtain parameters related to the coverage of multiple satellites. To obtain these parameters, the terminal device needs to obtain coverage parameters for multiple satellites from the serving satellite and / or actually measure signals from multiple satellites, resulting in high power consumption for the terminal device. Furthermore, obtaining coverage parameters for multiple satellites from the serving satellite also results in high overhead.

[0089] Therefore, the technical problems to be solved by the present application include at least one of the following: 1. Reducing the power consumption of a terminal device when acquiring satellite parameters; 2. Reducing the overhead of a terminal device when acquiring satellite coverage parameters from a serving satellite.

[0090] To solve at least one of the above problems, an embodiment of the present application provides a parameter determination method, which can be applied to the communication system shown in Figure 2A or Figure 2B. The flow of this method will be described in detail below with reference to the flowchart shown in Figure 3.

[0091] S301: The terminal device receives first information.

[0092] The first information may be used to indicate an association between a first parameter and a second parameter. The first parameter is a parameter related to the coverage of the first satellite, and the second parameter is a parameter related to the coverage of the second satellite. For example, the first parameter is a coverage parameter of the first satellite, and the second parameter is a coverage parameter of the second satellite. In another example, the first parameter is a parameter obtained by measuring the signal of the first satellite by a communication device within the coverage of the first satellite, and the second parameter is a parameter expected to be obtained by measuring the signal of the second satellite by a communication device within the coverage of the second satellite.

[0093] In this application, the first satellite may be a satellite that provides services to a terminal device. In other words, the first satellite may be the serving satellite for the terminal device. The second satellite may be a satellite that will soon provide services to the terminal device. For example, when the terminal device switches or reselects from the first satellite to the second satellite, the second satellite may be the satellite that will soon provide services to the terminal device. Optionally, the first satellite and the second satellite may be satellites orbiting in the same orbit.

[0094] Optionally, the first parameter may include at least one parameter: a coverage parameter of the first satellite, and a parameter obtained by the communication device within the coverage range of the first satellite by measuring the signal of the first satellite.

[0095] The coverage parameters of the first satellite may include:

[0096] 1. First Satellite Ephemeris: This includes the first satellite's reference time, orbit, and other parameters, and represents the relationship between the first satellite's position and time. This ephemeris allows for precise calculation, prediction, characterization, and tracking of the first satellite's time, position, velocity, and other operational states, and determines the first satellite's orbit.

[0097] 2. The orbit of the first satellite: This includes parameters such as the coordinates of at least one position in the orbit of the first satellite. The orbit of the first satellite can be determined based on the ephemeris of the first satellite. When the orbit completes one orbit around the Earth, it can be considered an orbit.

[0098] 3. Coverage of each beam of the first satellite at a given time: This coverage, also referred to as a coverage area, can be indicated by longitude and latitude, or by angle and boresight. The first satellite may include multiple beams, for example, from a dozen to several hundred beams. Each beam of the first satellite may correspond to a set of longitude and latitude, or a set of angle and boresight.

[0099] 4. The time period during which each beam of the first satellite covers each coverage area: This may include a start time and an end time, which are used to indicate the time period during which each beam of the first satellite covers each coverage area. For example, the current coverage area of ​​beam 1 of the first satellite is range 1, and the start time of the time period during which beam 1 covers range 1 is T a , the end time is T b .

[0100] The parameters obtained by the communication device by measuring the signal of the first satellite within the coverage range of the first satellite may include but are not limited to at least one of the following: the strength of the signal of the first satellite measured by the communication device within the coverage range of the first satellite, and the frequency deviation of the signal from the second satellite detected by the communication device within the coverage range of the first satellite.

[0101] Optionally, the second parameter may include at least one of the following parameters: a coverage parameter of the second satellite, and a parameter that the communication device expects to obtain by measuring the signal of the first satellite within the coverage range of the second satellite. The coverage parameter of the second satellite may include: the ephemeris of the second satellite, the orbit of the second satellite, the coverage range of each beam of the second satellite at a set time, and the time period during which each beam of the second satellite covers each coverage range. The specific content of the coverage parameter of the second satellite can refer to the description of the coverage parameter of the first satellite, except that the first satellite is replaced by the second satellite, and will not be repeated here. The parameter that the communication device expects to obtain by measuring the signal of the second satellite within the coverage range of the second satellite includes, but is not limited to, at least one of the following: the strength of the signal from the second satellite that the communication device expects to measure within the coverage range of the second satellite, and the frequency deviation of the signal from the second satellite that the communication device expects to detect within the coverage range of the second satellite.

[0102] In addition, the association relationship between the first parameter and the second parameter can also be called an inter-satellite quasi-co-location relationship or an inter-satellite correlation, which can be used to indicate that the parameters related to the second satellite coverage can be derived from the parameters related to the first satellite coverage.

[0103] Optionally, the terminal device may receive the first information from a first satellite; accordingly, the first satellite may transmit the first information to the terminal device. The first satellite may be a satellite operating in a transparent transmission mode or a regeneration mode. When the first satellite is in transparent transmission mode, the first satellite may receive the first information from a network device located on the ground. When the first satellite is in regeneration mode, the first satellite may determine the first information.

[0104] The following describes the process of determining the first information by taking the first satellite determining the first information as an example. The process may include steps A1-A2:

[0105] A1: The first satellite obtains the second information.

[0106] The second information may include the ephemeris of the first satellite, the ephemeris of the second satellite, and at least one of the following: the coverage range of the beam of the first satellite and the coverage range of the beam of the second satellite, the equivalent isotropically radiated power (EIRP) of the beam of the first satellite and the EIRP of the beam of the second satellite.

[0107] Optionally, the first satellite may obtain the ephemeris of the first satellite and the coverage of the first satellite's beam from the coverage information of the first satellite, and obtain the EIRP of the first satellite's beam locally. The first satellite may obtain the coverage information of the second satellite and the EIPR of the second satellite's beam from the second satellite, where the coverage information of the second satellite includes the ephemeris of the second satellite and the coverage of the second satellite's beam.

[0108] A2: The first satellite determines an association between the first parameter and the second parameter based on the second information, and determines first information indicating the association between the first parameter and the second parameter. The following describes the process by which the first satellite determines the association between the first parameter and the second parameter and the first information, with reference to different associations. This description is not provided here.

[0109] S302: The terminal device determines a second parameter according to the first information and the first parameter.

[0110] Optionally, when the first parameter is a coverage parameter of a first satellite and the second parameter is a coverage parameter of a second satellite, the terminal device may obtain the coverage parameter of the first satellite from the first satellite and determine the coverage parameter of the second satellite based on the correlation between the first parameter and the second parameter indicated by the first information. For example, the first information indicates that the first satellite and the second satellite are operating in the same orbit, and for any position on the orbit, the first satellite is ΔT ahead of the second satellite. a Arrival. The terminal device can determine the ephemeris of the second satellite based on the ephemeris of the first satellite. For another example, the first information indicates that the first satellite and the second satellite are operating in the same orbit. For any position on the orbit, the first satellite is ΔT ahead of the second satellite. b The first and second satellites arrive at the same location, and the first and second satellites use the same beam topology. The terminal device can determine the coverage range of the second satellite's beam based on the coverage range of the first satellite's beam. Through this method, after receiving the first information indicating the association between the coverage parameters of the first satellite and the coverage parameters of the second satellite, the terminal device can determine the coverage parameters of the second satellite based on the coverage parameters of the first satellite. This eliminates the need to obtain the coverage parameters of the second satellite from the first satellite, thereby reducing the overhead of obtaining satellite coverage parameters and the energy consumption required to receive the coverage parameters of the second satellite.

[0111] Optionally, when the first parameter is a parameter obtained by measuring the signal of the first satellite by a communication device within the coverage of the first satellite, and the second parameter is a parameter that a communication device within the coverage of the second satellite expects to measure the signal of the second satellite, the terminal device may measure the signal of the first satellite to obtain the first parameter, and determine, based on the correlation between the first parameter and the second parameter indicated by the first information, the second parameter that the terminal device expects to measure from the signal of the second satellite when the second satellite serves the terminal device. Through this method, after receiving the first information indicating the correlation between the first parameter and the second parameter, the terminal device may determine, based on the first parameter obtained by measuring the signal of the first satellite, the second parameter that the terminal device expects to measure from the signal of the second satellite when the second satellite serves the terminal device. This eliminates the need to actually measure the second parameter obtained by measuring the signal of the second satellite when the second satellite serves the terminal device, thereby reducing the delay in obtaining the second parameter and reducing the energy consumption required by the terminal device to measure the signal of the second satellite.

[0112] Through the method shown in Figure 3, after the terminal device receives the first information indicating the association between the first parameter and the second parameter, it can determine the second parameter related to the second satellite coverage based on the first parameter related to the first satellite coverage, thereby eliminating the need to obtain the second parameter from the first satellite or determine the second parameter by actually measuring the signal of the second satellite, thereby reducing the energy consumption required to obtain the second parameter.

[0113] Optionally, in the method shown in FIG3 , the first information may indicate the association relationship between the first parameter and the second parameter in at least one of the following ways.

[0114] Method 1: The first information may include: a first time interval and a first indication. The first time interval is the difference between two moments. The first indication may be used to indicate that the correlation between the first parameter and the second parameter includes: the first value is less than or equal to a first threshold. The first value may be a value determined based on the difference between two intensities. The two intensities include: the intensity of the signal from the first satellite detected by a communication device located in the first area at one of the two moments, and the intensity of the signal from the second satellite expected to be detected by a communication device located in the first area at the other of the two moments. In short, within the first area, the intensity change of the signal from the first satellite and the intensity change of the signal from the second satellite are the same or similar.

[0115] Optionally, the first value may be the absolute value of the difference between the two intensities, or a value proportional to the difference between the two intensities, or a value obtained by normalizing the difference between the two intensities.

[0116] In addition, the first indication may be set indication information, for example, it may be represented as inter-satellite quasi-co-location relationship type A (Sat-QCL type A). The first area may be an area within the coverage area of ​​the first satellite, for example, the first area is an area within the coverage area of ​​the first satellite at one of the two moments. The first threshold may be preset, determined by the first satellite, or obtained by the first satellite from another communication device, and this application is not limited to this.

[0117] Exemplarily, the first information may be expressed in the form of:

[0118]

[0119] CellID#2 is the cell identifier of the cell of the second satellite; Sat-QCL typeA is the first indication; and the value t1 of the time-interval parameter is the first time interval. This first information may indicate that the parameters related to the coverage of the cell with cell identifier 2 and the parameters related to the coverage of the cell of the first satellite have an association relationship as described in the first embodiment.

[0120] With this method, the first information received by a terminal device includes a first time interval and a first indication. Based on the first time interval and the first indication, the terminal device can determine a correlation between a first strength of a signal detected from a first satellite and a second strength of a signal expected to be detected from a second satellite. This allows the terminal device to determine the second strength based on the first strength and the first information without having to obtain coverage information about the second satellite from the first satellite, thereby reducing the power consumption and overhead required to obtain the second strength.

[0121] Optionally, in step A2, the first satellite may determine that the first parameter and the second parameter have the correlation relationship in method 1 based on the ephemeris of the first satellite, the ephemeris of the second satellite, the EIRP of the beam of the first satellite, and the EIRP of the beam of the second satellite, and determine the first information accordingly.

[0122] The path loss for different satellites in the same orbit is similar. For example, satellites 1 through 4 are in the same orbit. The horizontal axis in Figure 4 represents the normalized time relative to satellite 1 within a given coverage area; the vertical axis represents -20log10 (distance), expressed in decibels (dB), reflecting the impact of transmission distance on path loss. At a given frequency, the greater the distance, the greater the path loss. The normalized time relative to satellite 1 within a given coverage area is the time taken to align the time satellites 1 through 4 cover the given coverage area with the time satellite 1 covers the same coverage area. For example, if satellite 1 covers the given coverage area for 50 to 350 seconds and satellite 2 covers the given coverage area for 50+ΔT to 350+ΔT seconds, the time satellite 2 covers the given coverage area, aligned with the time satellite 1 covers the given coverage area, is 50 to 350 seconds, meaning the normalized time relative to satellite 1 within the given coverage area is 50 to 350 seconds.

[0123] As shown in Figure 4, the difference in path loss between different satellites in the same orbit is less than 1dB. Therefore, if different satellites in the same orbit use the same EIRP, the signal strength (for example, SINR) detected by the terminal device is also similar. Therefore, step A2 may include: the first satellite may determine the orbit of the first satellite based on the ephemeris of the first satellite, and determine the orbit of the second satellite based on the ephemeris of the second satellite, thereby determining whether the first satellite and the second satellite are operating in the same orbit. If the first satellite and the second satellite are operating in the same orbit, and the first satellite and the second satellite use the same EIRP to cover the first area, the first satellite may determine that the first parameter and the second parameter have the association relationship in method one, thereby determining that the first information includes the first indication.

[0124] Optionally, the first satellite may determine the first time interval based on the ephemeris of the first satellite and the ephemeris of the second satellite. For example, based on the ephemeris of the first satellite and the ephemeris of the second satellite, the first satellite may determine that the first satellite and the second satellite are operating in the same orbit, and for any position on the orbit, the first satellite is ΔT ahead of the second satellite. a Arrives, the first satellite can determine the first time interval as ΔT a .

[0125] Optionally, in method 1, the first parameter may include a first strength of a signal from a first satellite detected by the terminal device at a first moment. In this case, S302 may include: the terminal device determining, based on the first time interval and the first strength, a second strength of a signal from a second satellite that the terminal device is expected to detect at a second moment. The difference between the second moment and the first moment is the first time interval.

[0126] For example, the first time interval in the first information is ΔT1. If the terminal device detects a first strength of a signal from a first satellite of P1 at time T1, the terminal device may determine that a second strength of a signal from a second satellite expected to be detected at time T2 is approximately P1, where T2 = T1 + ΔT1.

[0127] Through this method, the terminal device can determine the second strength of the expected detected signal from the second satellite based on the first strength and first information of the detected signal from the first satellite, thereby eliminating the need to obtain the coverage information of the second satellite from the first satellite for measurement, and eliminating the need to actually measure the signal from the second satellite, thereby reducing the power consumption and overhead required to obtain the second strength.

[0128] Furthermore, this method allows a terminal device to determine the signal strength of another satellite in the same orbit based on the signal strength of one satellite. When a terminal device can determine the signal strengths of satellites in multiple orbits, it can select an appropriate satellite from the multiple orbits for cell reselection or handover. For example, when a first satellite and a second satellite are orbiting in orbit 1, the EIRP of the first satellite's beam is the same as the EIRP of the second satellite's beam; and when a third satellite and a fourth satellite are orbiting in orbit 2, the EIRP of the third satellite's beam is the same as the EIRP of the fourth satellite's beam. The terminal device can receive signals from the first and third satellites. In this way, the terminal device can determine the expected second strength of the signal from the second satellite based on the first strength of the signal detected from the first satellite, and the expected fourth strength of the signal from the fourth satellite based on the third strength of the signal detected from the third satellite. The terminal device can then determine whether to reselect or handover to the second satellite in orbit 1 or the fourth satellite in orbit 2 based on the second and fourth strengths. Optionally, when the second strength is greater than or equal to the fourth strength, the terminal device may reselect or switch to the second satellite on orbit 1; when the second strength is less than the fourth strength, the terminal device may reselect or switch to the fourth satellite on orbit 2.

[0129] Optionally, the first information in method one may also include a first time interval or a first indication.

[0130] When the first information includes the first time interval and the first information does not explicitly indicate the association between the first parameter and the second parameter (for example, the first information does not include the first indication), it may be assumed that the association between the first parameter and the second parameter includes: the first value is less than or equal to the first threshold. In other words, when the first information includes the first time interval and the first information does not explicitly indicate the association between the first parameter and the second parameter, the first information may indirectly indicate that the association between the first parameter and the second parameter includes: the first value is less than or equal to the first threshold.

[0131] For example, in step A2, the first satellite determines that the association between the first parameter and the second parameter includes that the first value is less than or equal to a first threshold, and determines a first time interval. In S301, the first satellite may transmit first information including the first time interval to the terminal device. Upon receiving the first information including the first time interval, the terminal device may determine that the association between the first parameter and the second parameter includes that the first value is less than or equal to the first threshold.

[0132] Exemplarily, the first information may be expressed in the form of:

[0133]

[0134] CellID#2 is the cell identifier of the cell of the second satellite; and the value t1 of the time-interval parameter is the first time interval. The first information may indicate that the parameters related to the coverage of the cell with cell identifier 2 and the parameters related to the coverage of the cell of the first satellite have an association relationship as described in the first embodiment.

[0135] In this method, the association between the first parameter and the second parameter can be indicated by including the first information of the first time interval, without including the first indication in the first information, thereby reducing the overhead required for transmitting the first information.

[0136] When the first information includes the first indication but does not include the first time interval, the first time interval involved in the association between the first parameter and the second parameter may be a first set time interval or a first default time interval. For example, in step A2, the first satellite determines the association between the first parameter and the second parameter, including: the first value is less than or equal to the first threshold, and determines the first time interval. If the first time interval is the first set time interval or the first default time interval, then in S301, the first satellite may send the first information including the first indication to the terminal device. After receiving the first information including the first indication, the terminal device may determine the association between the first parameter and the second parameter based on the first set time interval or the first default time interval.

[0137] Exemplarily, the first information may be expressed in the form of:

[0138]

[0139] CellID#2 is the cell identifier of the cell of the second satellite; Sat-QCL typeA is the first indication; and the first time interval is a first set time interval or a first default time interval. The first information may indicate that parameters related to coverage of the cell with cell identifier 2 and parameters related to coverage of the cell of the first satellite have an association relationship as described in method 1.

[0140] In this method, the association relationship between the first parameter and the second parameter can be indicated by including the first information of the first indication, without including the first time interval in the first information, thereby reducing the overhead required for transmitting the first information.

[0141] Optionally, in the first method, the first information further includes: a first offset, and the first offset can be used to indicate the offset between the two intensities.

[0142] The first offset may indicate a range of absolute values ​​of the offset. For example, a value of c1 for the first offset indicates that the absolute value of the difference between the two intensities is less than or equal to c1 dB, where c1 is a non-negative number. When the value determined based on the difference between the two intensities is the absolute value of the difference between the two intensities, and the first offset indicates a range of absolute values ​​of the offset, the value of the first offset may be the first threshold described above.

[0143] The first offset may also indicate a relative value range of the offset. For example, when the first offset is c1, it indicates that the ratio of the absolute value of the difference between the two intensities to one of the two intensities is less than or equal to c1%.

[0144] Exemplarily, the first information may be expressed in the form of:

[0145]

[0146] CellID#2 is the cell identifier of the second satellite's cell; Sat-QCL typeA is the first indication; the time-interval parameter value t1 is the first time interval; and the relaxation parameter value c1 is the first offset value. This first information may indicate that parameters related to coverage of the cell with cell identifier 2 and parameters related to coverage of the first satellite's cell have an association relationship as described in method 1.

[0147] In addition, the relaxation parameter is an optional parameter, that is, the first offset may not be included in the first information. For example, when the expected strengths of the signals sent by the first satellite and the second satellite in the first area are the same, the first offset may not be included in the first information.

[0148] Optionally, when the first information includes a first offset, in step A2, the first satellite may further determine the first offset. The first satellite may determine the range of the offset between the first intensity and the second intensity based on the EIRP of the first satellite's beam, the loss from the first satellite to the first area, the EIRP of the second satellite's beam, and the loss from the second satellite to the first area, thereby determining the first offset. The loss from the first satellite to the first area and the loss from the second satellite to the first area may be estimated losses or historically measured losses. For example, the EIRP of the first satellite's beam is P a , the loss from the first satellite to the first area is ΔP a , the EIRP of the second satellite's beam is P b , the loss from the second satellite to the first area is ΔP b , then the offset between the first intensity and the second intensity is less than or equal to P b -ΔP b -P a +ΔP a , at this time, the value of the first offset can be P b -ΔP b -P a +ΔP a .

[0149] Optionally, when the first information includes a first offset, S302 may include: the terminal device determining a second strength of a signal from a second satellite that the terminal device expects to detect at a second moment based on the first time interval, the first strength of the signal from the first satellite detected by the terminal device at the first moment, and the first offset.

[0150] For example, the first time interval is ΔT1, and the first offset indicates that the absolute value of the difference between the two intensities is less than or equal to c1 dB. If the terminal device detects a first intensity of the signal from the first satellite as P1 at time T1, the terminal device may determine that a second intensity of the signal from the second satellite expected to be detected at time T2 is within the range [P1-c1, P1+c1], where T2=T1+ΔT1, and [] represents a closed set.

[0151] For another example, if the first time interval is ΔT1, and the first offset indication indicates that the ratio of the absolute value of the difference between the two intensities to one of the two intensities is less than or equal to c1%, if the terminal device detects a first intensity of the signal from the first satellite as P1 at time T1, the terminal device may determine that a second intensity of the signal from the second satellite expected to be detected at time T2 is within the range [P1(1-c1%), P1(1+c1%)], where T2=T1+ΔT1.

[0152] Through this method, the terminal device can accurately determine the second strength of the signal from the second satellite expected to be detected based on the first strength and the first offset of the signal from the first satellite, thereby improving the accuracy of the predicted second strength.

[0153] Method 2: The first information includes: a second time interval and a second indication. The second time interval is the difference between two moments in time. The second indication is used to indicate the association between the first parameter and the second parameter, including: the second value is less than or equal to a second threshold. The second value is determined based on the difference between two frequency offsets. The two frequency offsets include: a frequency offset of a signal from the first satellite detected by a communication device located in the second area at one of the two moments in time, and a frequency offset of a signal from the second satellite expected to be detected by a communication device located in the second area at the other of the two moments in time.

[0154] Optionally, the second value may be the absolute value of the difference between the two frequency offsets, or a value proportional to the difference between the two frequency offsets, or a value obtained by normalizing the difference between the two frequency offsets.

[0155] In addition, the second indication may be set indication information, for example, it may be represented as inter-satellite quasi-co-location relationship type B (Sat-QCL type B). The second area is an area within the coverage area of ​​the first satellite. For example, at one of the two moments in time, the first area is an area within the coverage area of ​​the first satellite. The second threshold may be preset, determined by the first satellite, or obtained by the first satellite from another communication device, and this application is not limited to this.

[0156] Exemplarily, the first information may be expressed in the form of:

[0157]

[0158] CellID#2 is the cell identifier of the cell of the second satellite; Sat-QCL typeB is the second indication; and the value t2 of the time-interval parameter is the second time interval. The first information may indicate that the parameters related to the coverage of the cell with cell identifier 2 and the parameters related to the coverage of the cell of the first satellite are associated with each other in the second manner.

[0159] With this method, the first information received by a terminal device includes a second time interval and a second indication. Based on the second time interval and the second indication, the terminal device can determine the correlation between the first frequency offset of the signal detected from the first satellite and the second frequency offset of the signal expected to be detected from the second satellite. This eliminates the need for the terminal device to obtain parameters for determining the second frequency offset, such as the ephemeris and frequency compensation configuration of the second satellite, from the first satellite. Instead, the terminal device can determine the second frequency offset based on the first frequency offset and the first information, thereby reducing the power consumption and overhead required to obtain the parameters of the second satellite from the first satellite.

[0160] Optionally, in step A2, the first satellite may determine that the first parameter and the second parameter have an association relationship in method two based on the ephemeris of the first satellite, the ephemeris of the second satellite, the coverage range of the beam of the first satellite, and the coverage range of the beam of the second satellite, and determine the first information accordingly.

[0161] Signals passing overhead from different satellites in the same orbit have similar frequency offsets. Therefore, step A2 may include: the first satellite may determine the orbit of the first satellite based on the first satellite's ephemeris, and determine the orbit of the second satellite based on the second satellite's ephemeris, thereby determining whether the first satellite and the second satellite are operating in the same orbit. The first satellite may also determine whether the first satellite and the second satellite can cover the same area (e.g., the second area) based on the coverage range of the first satellite's beam and the coverage range of the second satellite's beam. If the first satellite and the second satellite are operating in the same orbit and can cover the second area, the first satellite may determine that the first parameter and the second parameter have the association relationship described in method 2, thereby determining that the first information includes the second indication.

[0162] Optionally, the first satellite may further determine the second time interval based on the ephemeris of the first satellite and the ephemeris of the second satellite. For example, based on the ephemeris of the first satellite and the ephemeris of the second satellite, the first satellite determines that the first satellite and the second satellite are operating in the same orbit, and for any position on the orbit, the first satellite is ΔT ahead of the second satellite. a Arrives, the first satellite can determine the second time interval as ΔT a .

[0163] Optionally, in the second method, the first parameter may include a first frequency offset of a signal from the first satellite detected by the terminal device at the third time. In this case, S302 may include: the terminal device determining, based on the second time interval and the first frequency offset, a second frequency offset of a signal from the second satellite that the terminal device expects to detect at a fourth time, where the difference between the fourth time interval and the third time interval is the second time interval. The second time interval may be the same as or different from the first time interval, and this is not limited in this application.

[0164] For example, the second time interval is ΔT2. If the terminal device detects a first frequency offset of S1 for the signal from the first satellite at time T3, the terminal device may determine that the second frequency offset of the signal from the second satellite expected to be detected at time T4 is approximately S1, where T4=T3+ΔT2.

[0165] Through this method, a terminal device can determine the second frequency offset of a signal from a second satellite that is expected to be detected based on the first frequency offset and first information of the signal detected from the first satellite. This eliminates the need to obtain parameters for determining the second frequency offset, such as the second satellite's ephemeris and frequency compensation configuration, from the first satellite, thereby reducing the complexity of downlink synchronization for the terminal device. Furthermore, through this method, the terminal device does not need to search for the signal from the second satellite in the frequency and angle domains, thereby reducing the number of blind detections, lowering the search overhead in the frequency and angle domains when receiving the signal from the second satellite, and reducing the energy consumption required to receive the signal from the second satellite.

[0166] Optionally, the first information in the second method may also include a second time interval or a second indication.

[0167] When the first information includes the second time interval and the first information does not explicitly indicate the association between the first parameter and the second parameter (for example, the first information does not include the second indication), it may be assumed that the association between the first parameter and the second parameter includes: the second value is less than or equal to the second threshold. In other words, when the first information includes the second time interval and the first information does not explicitly indicate the association between the first parameter and the second parameter, the first information may indirectly indicate that the association between the first parameter and the second parameter includes: the second value is less than or equal to the second threshold.

[0168] For example, in step A2, the first satellite determines that the association between the first parameter and the second parameter includes that the second value is less than or equal to a second threshold, and determines a second time interval. In S301, the first satellite may transmit first information including the second time interval to the terminal device. Upon receiving the first information including the second time interval, the terminal device may determine that the association between the first parameter and the second parameter includes that the second value is less than or equal to the second threshold.

[0169] Exemplarily, the first information may be expressed in the form of:

[0170]

[0171]

[0172] CellID#2 is the cell identifier of the cell of the second satellite; and the value t2 of the time-interval parameter is the second time interval. The first information may indicate that the parameters related to the coverage of the cell with cell identifier 2 and the parameters related to the coverage of the cell of the first satellite have an association relationship in the second manner.

[0173] In this method, the association between the first parameter and the second parameter can be indicated by including the first information of the second time interval, without including the second indication in the first information, thereby reducing the overhead required for transmitting the first information.

[0174] When the first information includes the second indication but does not include the second time interval, the second time interval involved in the association between the first parameter and the second parameter may be a second set time interval or a second default time interval. For example, in step A2, the first satellite determines that the association between the first parameter and the second parameter includes: the second value is less than or equal to the second threshold, and determines the second time interval. If the determined second time interval is the second set time interval or the second default time interval, then in step S301, the first satellite may send the first information including the second indication to the terminal device. After receiving the first information including the second indication, the terminal device may determine the association between the first parameter and the second parameter based on the second set time interval or the second default time interval.

[0175] Exemplarily, the first information may be expressed in the form of:

[0176]

[0177] CellID#2 is the cell identifier of the cell of the second satellite; Sat-QCL type B is the second indication; and the second time interval is the second set time interval or the second default time interval. The first information may indicate that the parameters related to the coverage of the cell with cell identifier 2 and the parameters related to the coverage of the cell of the first satellite are associated with each other in the second manner.

[0178] In this method, the association between the first parameter and the second parameter can be indicated by including the first information including the second indication, without including the second time interval in the first information, thereby reducing the overhead required for transmitting the first information.

[0179] Optionally, in the second method, the first information further includes: a second offset, and the second offset can be used to indicate the offset between the two frequency offsets.

[0180] The second offset may indicate a range of absolute values ​​of the offset. For example, a value of c2 for the second offset indicates that the absolute value of the difference between the two frequency offsets is less than or equal to c2, where c2 is a non-negative number. When the value determined based on the difference between the two frequency offsets is the absolute value of the difference between the two frequency offsets, and the second offset indicates a range of absolute values ​​of the offset, the value of the second offset may be the second threshold described above.

[0181] The second offset may also indicate a relative value range of the offset. For example, when the second offset value is c2, it indicates that the ratio of the absolute value of the difference between the two frequency offsets to one of the two frequency offsets is less than or equal to c2%.

[0182] Exemplarily, the first information may be expressed in the form of:

[0183]

[0184]

[0185] Wherein, CellID#2 is the cell identifier of the cell of the second satellite; Sat-QCL typeB is the second indication;

[0186] The value t2 of the time-interval parameter is the second time interval; the value c2 of the relaxation parameter is the value of the second offset. The first information may indicate that the parameters related to the coverage of the cell with the cell identifier 2 and the parameters related to the coverage of the cell of the first satellite have an association relationship in the second manner.

[0187] In addition, the relaxation parameter is an optional parameter, that is, the first information may not include the relaxation parameter. For example, when the expected frequency offsets of the signals transmitted by the first satellite and the second satellite in the second area are the same, the first information may not include the relaxation parameter.

[0188] Optionally, when the first information includes a second offset, in step A2, the first satellite may further determine the second offset. The first satellite may determine the range of the offset between the first frequency offset and the second frequency offset based on the first angle and the second angle. The first angle is the angle between a first connecting line and the direction of motion of the first satellite when the first satellite covers the second range. The first connecting line is a line connecting the first satellite and a first point in the second range, and the first point is a point in the second range (e.g., the center point of the second range). The second angle is the angle between a second connecting line and the direction of motion of the second satellite when the second satellite covers the second range. The second connecting line is a line connecting the second satellite and a second point in the second range, and the second point is a point in the second range (e.g., the center point of the second range). The second point may be the same as the first point. For example, if the first angle is R1 and the second angle is R2, the offset range between the first frequency offset and the second frequency offset is less than or equal to the frequency offset corresponding to the angle (R2-R1).

[0189] In step A2, the first satellite may determine, based on the ephemeris of the first satellite and the coverage range of the beam of the first satellite, a first connecting line when the first satellite covers the second range and the direction of movement of the first satellite. The first satellite may determine, based on the ephemeris of the second satellite and the coverage range of the beam of the second satellite, a second connecting line when the second satellite covers the second range and the direction of movement of the second satellite.

[0190] Optionally, when the first information includes the second offset, S302 may include: the terminal device determines the second frequency offset of the signal from the second satellite that the terminal device expects to detect at the fourth moment based on the second time interval, the first frequency offset of the signal from the first satellite detected by the terminal device at the third moment, and the second offset.

[0191] For example (hereinafter referred to as Example 2), the second time interval is ΔT2, and the second offset indicates that the absolute value of the difference between the two frequency offsets is less than or equal to c2. If the terminal device detects a first frequency offset of S1 for a signal of a first satellite at time T3, the terminal device may determine that a second frequency offset of a signal of a second satellite expected to be detected at time T4 is within the range [S1-c2, S1+c2], where T4=T3+ΔT2.

[0192] For another example (hereinafter referred to as Example 3), the second time interval is ΔT2, and the second offset indicates that the ratio of the absolute value of the difference between the two frequency offsets relative to the first frequency offset is less than or equal to c2%. If the terminal device detects a first frequency offset of S1 for a signal of a first satellite at time T3, the terminal device may determine that a second frequency offset of a signal of a second satellite expected to be detected at time T4 is within the range [S1(1-c2%), S1(1+c2%)], where T4=T3+ΔT2.

[0193] Optionally, after S302, the terminal device may use the second frequency offset to receive and detect the signal from the second satellite. For example, in the above example 2, the terminal device may detect the signal from the second satellite within the frequency offset range [S1-c2, S1+c2] at time T4. For another example, in the above example 3, the terminal device may use the second frequency offset to receive and detect the signal from the second satellite within the frequency offset range [S1(1-c2%),

[0194] Within S1(1+c2%)], the signal from the second satellite is detected.

[0195] Through this method, the terminal device can accurately determine the second frequency offset of the signal from the second satellite to be detected based on the first frequency offset and the second offset of the signal from the first satellite, thereby improving the accuracy of predicting the second frequency offset.

[0196] Mode three: the first information includes: a third time interval and a third indication.

[0197] The third time interval is related to two time periods. These two time periods may include: a time period when the first satellite covers the third area (hereinafter referred to as time period 1), and a time period when the second satellite covers the third area (hereinafter referred to as time period 2). The third area may be an area within the coverage area of ​​the first satellite. For example, the third area is an area within the coverage area of ​​the first satellite during time period 1. For example (hereinafter referred to as Example 1), time period 1 is [a, b], meaning that the first satellite covers the third area from time a to time b; time period 2 may be [d, e], meaning that the second satellite covers the third area from time d to time e.

[0198] Optionally, the third time interval is at least one of the following:

[0199] 1. The difference between the expected start times of two time periods: for example, the difference between the start time of time period 2 and the start time of time period 1. In Example 1, the third time interval may be da.

[0200] 2. The difference between the expected end times of two time periods: for example, the difference between the end time of time period 2 and the end time of time period 1. In Example 1, the third time interval may be eb.

[0201] 3. The difference between the expected end time of one of the two time periods and the expected start time of the other of the two time periods: For example, the difference between the start time of Time Period 2 and the end time of Time Period 1. In this case, in Example 1, the third time interval can be db. For another example, the difference between the end time of Time Period 2 and the start time of Time Period 1. In this case, in Example 1, the third time interval can be ea.

[0202] The third indication may be used to indicate an association between the first parameter and the second parameter, including: the third value being less than or equal to a third threshold. The third value is determined based on the difference between the first duration and the second duration. The first duration is the duration of the time period (i.e., time period 1) during which the first satellite covers the third area, and the second duration is the duration of the time period (i.e., time period 2) during which the second satellite covers the third area.

[0203] Optionally, the third value may be the absolute value of the difference between the first duration and the second duration, or a value proportional to the difference between the first duration and the second duration, or a value obtained by normalizing the difference between the first duration and the second duration.

[0204] In addition, the third indication may be set indication information, for example, it may be represented as inter-satellite quasi-co-location relationship type C (Sat-QCL type C). The third threshold may be preset, determined by the first satellite, or obtained by the first satellite from other communication devices, which is not limited in this application.

[0205] Exemplarily, the first information may be expressed in the form of:

[0206]

[0207] CellID#2 is the cell identifier of the cell of the second satellite; Sat-QCL typeC is the third indication; and the value t3 of the time-interval parameter is the third time interval. The first information may indicate that the parameters related to the coverage of the cell with cell identifier 2 and the parameters related to the coverage of the cell of the first satellite have an association relationship in manner three.

[0208] Through this method, the first information received by the terminal device may include the third time interval and the third indication. Based on the third time interval and the third indication, the terminal device can determine the association between the first time period during which the signal from the first satellite is detected and the second time period during which the signal from the second satellite is expected to be detected. In this way, the terminal device can determine the second time period based on the first time period and the first information without having to obtain the coverage parameters of the second satellite from the first satellite, thereby reducing the overhead and power consumption of obtaining the coverage parameters of the second satellite.

[0209] Optionally, in step A2, the first satellite may determine that the first parameter and the second parameter have the correlation relationship in method three based on the ephemeris of the first satellite, the ephemeris of the second satellite, the coverage range of the beam of the first satellite, and the coverage range of the beam of the second satellite, and determine the first information.

[0210] Exemplarily, the first satellite may determine the orbit of the first satellite based on the ephemeris of the first satellite, and determine the orbit of the second satellite based on the ephemeris of the second satellite, thereby determining whether the first satellite and the second satellite are operating in the same orbit. The first satellite may also determine whether the first satellite and the second satellite use the same beam topology to cover the same area (e.g., the third area) based on the coverage range of the beam of the first satellite and the coverage range of the beam of the second satellite. If the first satellite and the second satellite are operating in the same orbit, and the first satellite and the second satellite use the same beam topology to cover the second area, the first satellite may determine that the first parameter and the second parameter have the association relationship in mode three, thereby determining that the first information includes the third indication.

[0211] Optionally, the first satellite may further determine the third time interval based on the ephemeris of the first satellite and the ephemeris of the second satellite. For example, based on the ephemeris of the first satellite and the ephemeris of the second satellite, the first satellite may determine that the first satellite and the second satellite are operating in the same orbit, and for any position on the orbit, the first satellite is ΔT ahead of the second satellite. a Arrives, the first satellite can determine the third time interval as ΔT a .

[0212] Optionally, in mode 3, the first parameter may include a first time period during which the terminal device detects a signal from the first satellite. In this case, S302 may include: the terminal device determining, based on the third time interval and the first time period, a second time period during which the terminal device is expected to detect a signal from the second satellite.

[0213] For example, the third time interval is the difference between the expected start times of the two time periods and the difference between the expected end times of the two time periods, and the third time interval is ΔT3. If the first time period during which the terminal device detects a signal from the first satellite is [a1, b1], the terminal device determines that the second time period during which the terminal device expects to detect a signal from the second satellite is [a1+ΔT3, b1+ΔT3].

[0214] For another example, the third time interval is the difference between the expected start time of the later time interval and the expected end time of the earlier time interval, and the third time interval is ΔT3. If the first time interval during which the terminal device detects a signal from a first satellite is [a1, b1], the terminal device determines that the second time interval during which the terminal device expects to detect a signal from a second satellite is [b1+ΔT3, b1+ΔT3+b1-a1].

[0215] For another example, the third time interval is the difference between the expected end time of the later time interval and the expected start time of the earlier time interval, and the third time interval is ΔT3. If the first time interval during which the terminal device detects a signal from a first satellite is [a1, b1], the terminal device determines that the second time interval during which the terminal device expects to detect a signal from a second satellite is [a1+ΔT3-b1+a1, a1+ΔT3].

[0216] Through this method, a terminal device can determine a first time period during which a signal from a first satellite is detected, and then, based on the third time interval indicated by the first information, determine a second time period during which the terminal device is expected to detect a signal from a second satellite. This allows the terminal device to determine the second time period during which signals from the second satellite are detectable without having to obtain the coverage parameters of the second satellite from the first satellite, thereby reducing the overhead and power consumption of obtaining the coverage parameters of the second satellite.

[0217] Optionally, the first information in the third method may also include a third time interval or a third indication.

[0218] When the first information includes the third time interval and the first information does not explicitly indicate the association between the first parameter and the second parameter (for example, the first information does not include the third indication), it may be assumed that the association between the first parameter and the second parameter includes: the third value is less than or equal to the third threshold. In other words, when the first information includes the third time interval and the first information does not explicitly indicate the association between the first parameter and the second parameter, the first information may indirectly indicate that the association between the first parameter and the second parameter includes: the third value is less than or equal to the third threshold.

[0219] For example, in step A2, the first satellite determines that the association between the first parameter and the second parameter includes that the third value is less than or equal to a third threshold, and determines a third time interval. In S301, the first satellite may transmit first information including the third time interval to the terminal device. Upon receiving the first information including the third time interval, the terminal device may determine that the association between the first parameter and the second parameter includes that the third value is less than or equal to the third threshold.

[0220] Exemplarily, the first information may be expressed in the form of:

[0221]

[0222] CellID#2 is the cell identifier of the cell of the second satellite; and the value t3 of the time-interval parameter is the third time interval. The first information may indicate that the parameters related to the coverage of the cell with cell identifier 2 and the parameters related to the coverage of the cell of the first satellite have an association relationship in manner three.

[0223] In this method, the association between the first parameter and the second parameter can be indicated by including the first information of the third time interval, without including the third indication in the first information, thereby reducing the overhead required for transmitting the first information.

[0224] When the first information includes the third indication but does not include the third time interval, the third time interval involved in the association between the first parameter and the second parameter may be a third set time interval or a third default time interval. For example, in step A2, the first satellite determines that the association between the first parameter and the second parameter includes: the third value is less than or equal to a third threshold value, and determines the third time interval. If the determined third time interval is the third set time interval or the third default time interval, then in step S301, the first satellite may send the first information including the third indication to the terminal device. Upon receiving the first information including the third indication, the terminal device may determine the association between the first parameter and the second parameter based on the third set time interval or the third default time interval.

[0225] Exemplarily, the first information may be expressed in the form of:

[0226]

[0227] CellID#2 is the cell identifier of the cell of the second satellite; Sat-QCL type C is the third indication; and the third time interval is a third set time interval or a third default time interval. The first information may indicate that the parameters related to the coverage of the cell with cell identifier 2 and the parameters related to the coverage of the cell of the first satellite are associated with each other in manner three.

[0228] In this method, the association between the first parameter and the second parameter can be indicated by including the first information including the third indication, without including the third time interval in the first information, thereby reducing the overhead required for transmitting the first information.

[0229] Optionally, in mode three, the first information may further include: a third offset, where the third offset is used to indicate an offset of the second duration relative to the first duration.

[0230] The third offset may indicate a range of absolute values ​​for the offset. For example, a value of c3 for the third offset indicates that the absolute value of the offset of the second duration relative to the first duration is less than or equal to c3 seconds, where c3 is a non-negative number. When the third value is the absolute value of the difference between the first duration and the second duration, and the third offset indicates a range of absolute values ​​for the offset, the value of the third offset may be the third threshold described above.

[0231] The third offset may also indicate a relative value range of the offset. For example, when the third offset is c3, it means that the ratio of the absolute value of the difference between the second duration and the first duration to the first duration is less than or equal to c3%.

[0232] Exemplarily, the first information may be expressed in the form of:

[0233]

[0234] CellID#2 is the cell identifier of the cell of the second satellite; Sat-QCL typeC is the third indication; the value t3 of the time-interval parameter is the third time interval; and the value c3 of the relaxation parameter is the value of the third offset. This first information may indicate that the parameters related to the coverage of the cell with cell identifier 2 and the parameters related to the coverage of the cell of the first satellite are associated with each other in manner three.

[0235] In addition, the relaxation parameter is an optional parameter, that is, the first information may not include the relaxation parameter. For example, when the expected duration of the time period during which the first satellite and the second satellite cover the third area is the same, the first information may not include the relaxation parameter.

[0236] Optionally, when the first information includes a third offset, in step A2, the first satellite may further determine the third offset. The first satellite may determine the offset of the second duration relative to the first duration based on the following parameters: the first satellite's orbit, the coverage of the first satellite's beam, the second satellite's orbit, and the coverage of the second satellite's beam, thereby determining the third offset. For example, the first satellite may determine, based on the first satellite's orbit and the coverage of the first satellite's beam, that the first duration of the time period during which the first satellite covers the third area is W1. The first satellite may determine, based on the second satellite's orbit and the coverage of the second satellite's beam, that the second duration of the time period during which the second satellite covers the third area is W2. The first satellite may determine that the offset of the second duration relative to the first duration is less than or equal to the absolute value of W2-W1, and may determine the value of the third offset to be the absolute value of W2-W1.

[0237] Optionally, when the first information includes the third offset, S302 may include: the terminal device may determine a second time period in which the terminal device is expected to detect the signal from the second satellite based on the third time interval, the third offset, and the first time period in which the terminal device detects the signal from the first satellite.

[0238] For example (hereinafter referred to as Example 4), the third time interval is the difference between the expected start times of the two time periods and / or the difference between the expected end times of the two time periods, the third time interval is ΔT3, and the third offset indicates that the absolute value of the offset of the third time interval is less than or equal to c3 seconds. If the first time period during which the terminal device detects a signal from the first satellite is [a1, b1], the terminal device determines that the second time period during which the terminal device expects to be able to detect a signal from the second satellite is [a1+ΔT3-c3, b1+ΔT3+c3].

[0239] For another example (hereinafter referred to as Example 5), the third time interval is the difference between the expected start times of the two time periods, the third time interval is ΔT3, and the third offset indicates that the ratio of the absolute value of the difference between the second time period and the first time period relative to the first time period is less than or equal to c3%. If the first time period during which the terminal device detects a signal from the first satellite is [a1, b1], the terminal device determines that the second time period during which the terminal device expects to detect a signal from the second satellite is [(a1+ΔT3-(b1-a1)(1+c3%), (b1+ΔT3)+(b1-a1)(1+c3%)].

[0240] Optionally, after S302, the terminal device may detect a signal from the second satellite within a second time period. For example, in Example 4, the terminal device may detect a signal from the second satellite within [a1+ΔT3-c3, b1+ΔT3+c3]. For another example, in Example 5, the terminal device may detect a signal from the second satellite within [(a1+ΔT3-(b1-a1)(1+c3%), (b1+ΔT3)+(b1-a1)(1+c3%)].

[0241] Through this method, the terminal device can determine the first time period, the third time interval and the third offset for detecting the signal from the first satellite, and accurately determine the second time period in which the terminal device is expected to detect the signal from the second satellite, thereby improving the accuracy of predicting the second time period.

[0242] Optionally, Method 1 to Method 3 can be used individually or in combination.

[0243] Optionally, in this application, the association relationship between the first parameter and the second parameter can be transferred. The following description will be made by taking the association relationship in the first mode as an example.

[0244] If the parameters related to satellite 2's coverage and the parameters related to satellite 1's coverage have the association relationship described in mode 1, and the parameters related to satellite 3's coverage and the parameters related to satellite 2's coverage have the association relationship described in mode 1, then the parameters related to satellite 3's coverage and the parameters related to satellite 1's coverage have the association relationship described in mode 1. In this case, the time-interval parameter and / or the relaxation parameter may be expanded.

[0245] For example, if the parameters related to the coverage of satellite 2 and the parameters related to the coverage of satellite 1 have an association relationship in the first manner, and the value of the time-interval parameter is t1, then the parameters related to the coverage of satellite 3 and the parameters related to the coverage of satellite 1 have an association relationship in the first manner, the value of the time-interval parameter can be 2*t1.

[0246] For another example, if the parameters related to the coverage of satellite 2 and the parameters related to the coverage of satellite 1 have an association relationship in the first manner, the value of the relaxation parameter is c1, and c1 indicates the absolute value of the offset, then the parameters related to the coverage of satellite 3 and the parameters related to the coverage of satellite 1 have an association relationship in the first manner, the value of the time-interval parameter can be 2*c1.

[0247] For another example, if the parameters related to the coverage of satellite 2 and the parameters related to the coverage of satellite 1 have an association relationship in the first manner, the value of the relaxation parameter is c1, and c1 indicates a relative value of the offset, then the parameters related to the coverage of satellite 3 and the parameters related to the coverage of satellite 1 have an association relationship in the first manner, the value of the time-interval parameter may be (c1%). 2 .

[0248] Based on the same technical concept as the method embodiment of Figure 3, the embodiment of the present application provides a parameter determination device through Figure 5, which can be used to perform the functions of the relevant steps in the above method embodiment. The functions can be implemented by hardware, or by software or hardware executing corresponding software implementations. The hardware or software includes one or more modules corresponding to the above functions. The structure of the parameter determination device is shown in Figure 5, including a communication unit 501 and a processing unit 502. The parameter determination device 500 can be applied to the terminal device in the communication system shown in Figure 2A or Figure 2B, and can implement the parameter determination method provided in the above embodiments and examples of the present application. The functions of each unit in the parameter determination device 500 are introduced below.

[0249] The communication unit 501 is used to receive and send data.

[0250] When the parameter determination apparatus 500 is applied to a terminal device, the communication unit 501 may be implemented by a transceiver, for example, a mobile communication module, wherein the mobile communication module may include at least one antenna, at least one filter, a switch, a power amplifier, a low noise amplifier (LNA), etc.

[0251] The processing unit 502 can be used to support the parameter determination device 500 in performing the processing actions in the above method embodiment. The processing unit 502 can be implemented by a processor. For example, the processor can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general-purpose processor can be a microprocessor or any conventional processor.

[0252] In one embodiment, the parameter determination device 500 is applied to the terminal device in the embodiment of the present application shown in Figure 3. The specific functions of the processing unit 502 in this embodiment are introduced below.

[0253] The processing unit 502 is used to receive first information through the communication unit 501, where the first information is used to indicate an association relationship between a first parameter and a second parameter; the first parameter is a parameter related to the coverage of the first satellite, and the second parameter is a parameter related to the coverage of the second satellite; the first satellite is a satellite providing services for the terminal device, and the second satellite is a satellite that will soon provide services for the terminal device; and the second parameter is determined based on the first information and the first parameter.

[0254] Optionally, the first parameter includes at least one of the following parameters: the ephemeris of the first satellite, the orbit of the first satellite, the coverage range of each beam of the first satellite at a set time, the time period that each beam of the first satellite covers each coverage range, and the parameter obtained by the communication device by measuring the signal of the first satellite within the coverage range of the first satellite; the second parameter includes at least one of the following parameters: the ephemeris of the second satellite, the orbit of the second satellite, the coverage range of each beam of the second satellite at a set time, the time period that each beam of the second satellite covers each coverage range, and the parameter expected to be obtained by the communication device by measuring the signal of the second satellite within the coverage range of the second satellite.

[0255] Optionally, the first information includes: a first time interval and a first indication; the first time interval is the difference between two moments; the first indication is used to indicate that the association relationship includes: a first value is less than or equal to a first threshold; wherein the first value is a value determined based on the difference between two intensities; the two intensities include: the strength of the signal from the first satellite detected by a communication device located in the first area at one of the two moments, and the strength of the signal from the second satellite expected to be detected by the communication device located in the first area at the other of the two moments; the first area is an area within the coverage range of the first satellite.

[0256] Optionally, the first parameter includes a first strength of a signal from the first satellite detected by the terminal device at a first moment, and the processing unit 502 is specifically used to determine, based on the first time interval and the first strength, a second strength of a signal from the second satellite that the terminal device is expected to detect at a second moment, and the difference between the second moment and the first moment is the first time interval.

[0257] Optionally, the first information further includes: a first offset, where the first offset is used to indicate an offset between the two intensities; and the processing unit 502 is specifically used to determine the second intensity based on the first time interval, the first intensity and the first offset.

[0258] Optionally, the first information includes: the second time interval and a second indication; the second time interval is the difference between two moments; the second indication is used to indicate that the association relationship includes: the second value is less than or equal to a second threshold; wherein the second value is a value determined based on the difference between two frequency deviations; the two frequency deviations include: the frequency deviation of the signal from the first satellite detected by a communication device located in the second area at one of the two moments, and the frequency deviation of the signal from the second satellite expected to be detected by a communication device located in the second area at the other of the two moments; the second area is an area within the coverage range of the first satellite.

[0259] Optionally, the first parameter includes a first frequency offset of the signal from the first satellite detected by the terminal device at a third moment, and the processing unit 502 is specifically used to determine a second frequency offset of the signal from the second satellite detected by the terminal device at a fourth moment based on the second time interval and the first frequency offset, and the difference between the fourth moment and the third moment is the second time interval.

[0260] Optionally, the first information also includes: a second offset, where the second offset is used to indicate the offset between the two frequency offsets; and the processing unit 502 is specifically used to determine the second frequency offset based on the second time interval, the first frequency offset and the second offset.

[0261] Optionally, the first information includes: a third time interval and a third indication; the third time interval is at least one of the following: the difference between the expected start times of the two time periods, the difference between the expected end times of the two time periods, and the difference between the expected end time of one of the two time periods and the expected start time of the other of the two time periods; the two time periods include: the time period in which the first satellite covers the third area, and the time period in which the second satellite covers the third area; wherein the third area is an area within the coverage range of the first satellite; the third indication is used to indicate that the association relationship includes: a third value is less than or equal to a third threshold, the third value is a value determined based on the difference between the first duration and the second duration, the first duration is the duration of the time period in which the first satellite covers the third area, and the second duration is the duration of the time period in which the second satellite covers the third area.

[0262] Optionally, the first parameter includes a first time period in which the terminal device detects the signal from the first satellite, and the processing unit 502 is specifically used to determine a second time period in which the terminal device is expected to detect the signal from the second satellite based on the third time interval and the first time period.

[0263] Optionally, the first information also includes: a third offset, the third offset is used to indicate the offset of the second duration relative to the first duration; the processing unit 502 is specifically used to: determine the second time period based on the third time interval, the third offset and the first time period.

[0264] It should be noted that the division of modules in the above embodiments of the present application is illustrative and is only a logical functional division. In actual implementation, there may be other division methods. In addition, the functional units in the various embodiments of the present application may be integrated into a processing unit, or may exist separately physically, or two or more units may be integrated into a single unit. The above-mentioned integrated units may be implemented in the form of hardware or in the form of software functional units.

[0265] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0266] Based on the same technical concept, the embodiment of the present application provides a parameter determination device as shown in Figure 6, which can be used to perform the relevant steps in the above method embodiments. The parameter determination device can be applied to the terminal device in the communication system shown in Figure 2A or Figure 2B, can implement the parameter determination method provided in the above embodiments and examples of the present application, and has the functions of the parameter determination device shown in Figure 5. Referring to Figure 6, the parameter determination device 600 includes: a communication module 601, a processor 602, and a memory 603. The communication module 601, the processor 602, and the memory 603 are interconnected.

[0267] Optionally, the communication module 601, the processor 602, and the memory 603 are interconnected via a bus 604. The bus 604 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus. The bus may be classified as an address bus, a data bus, a control bus, etc. For ease of illustration, FIG6 shows only one thick line, but this does not mean that there is only one bus or only one type of bus.

[0268] The communication module 601 is used to receive and send data to realize communication interaction with other devices. For example, the communication module 601 can be realized through a physical interface, a communication module, a communication interface, and an input / output interface.

[0269] The processor 602 can be used to support the parameter determination device 600 in performing the processing actions in the above-mentioned method embodiment. When the parameter determination device 600 is used to implement the above-mentioned method embodiment, the processor 602 can also be used to implement the functions of the above-mentioned processing unit 502. The processor 602 can be a CPU, or other general-purpose processor, DSP, ASIC, FPGA, or other programmable logic device, transistor logic device, hardware component, or any combination thereof. The general-purpose processor can be a microprocessor or any conventional processor.

[0270] In one embodiment, the parameter determination apparatus 600 is applied to the terminal device in the embodiment of the present application shown in FIG3 . The processor 602 is specifically configured to: receive first information via the communication module 601, where the first information indicates an association between a first parameter and a second parameter; the first parameter is a parameter related to the coverage of a first satellite, and the second parameter is a parameter related to the coverage of a second satellite; the first satellite is a satellite providing services to the terminal device, and the second satellite is a satellite that will provide services to the terminal device; and determine the second parameter based on the first information and the first parameter.

[0271] The specific functions of the processor 602 can refer to the description of the parameter determination method provided in the above embodiments and examples of the present application, as well as the specific functional description of the parameter determination device 500 in the embodiment of the present application shown in Figure 5, which will not be repeated here.

[0272] The memory 603 is used to store program instructions and data. Specifically, the program instructions may include program code, which includes computer operating instructions. The memory 603 may include RAM, and may also include non-volatile memory (non-volatile memory), such as at least one disk storage. The processor 602 executes the program instructions stored in the memory 603 and uses the data stored in the memory 603 to implement the above functions, thereby implementing the parameter determination method provided in the above embodiment of the present application.

[0273] It is understood that the memory 603 in FIG. 6 of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be ROM, programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electrically erasable programmable read-only memory (Electrically EPROM, EEPROM) or flash memory. The volatile memory can be RAM, which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct RAM bus random access memory (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0274] Based on the above embodiments, an embodiment of the present application further provides a computer program, which, when executed on a computer, enables the methods provided in the above embodiments to be implemented.

[0275] Based on the above embodiments, an embodiment of the present application further provides a computer-readable storage medium, in which a computer program is stored. When the computer program is executed by a computer, the method provided in the above embodiments is implemented.

[0276] The storage medium may be any available medium that can be accessed by a computer. By way of example and not limitation, computer-readable media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and can be accessed by a computer.

[0277] Based on the above embodiments, an embodiment of the present application further provides a chip, which is used to read a computer program stored in a memory, so that the method provided in the above embodiments is implemented.

[0278] Based on the above embodiments, embodiments of the present application provide a chip system, which includes a processor for supporting a computer device to implement the functions involved in each device in the above embodiments. In one possible design, the chip system also includes a memory for storing the necessary programs and data for the computer device. The chip system can be composed of a chip or can include a chip and other discrete devices.

[0279] In summary, embodiments of the present application provide a parameter determination method and apparatus. In this method, a terminal device in a satellite communication system can determine a second parameter based on the first information and the first parameter after receiving first information. The first information can be used to indicate the correlation between the first parameter and the second parameter. The first parameter is a parameter related to the coverage of the first satellite, and the second parameter is a parameter related to the coverage of the second satellite. The first satellite is a satellite that provides services to the terminal device, and the second satellite is a satellite that will soon provide services to the terminal device. Through this method, after receiving the first information indicating the correlation between the first parameter and the second parameter, the terminal device can determine the second parameter based on the first parameter, thereby eliminating the need to obtain the second parameter from the first satellite or determine the second parameter by actually measuring the signal of the second satellite, thereby reducing the energy consumption required to obtain the second parameter.

[0280] In the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0281] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0282] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the present application. It should be understood that each flow and / or box in the flow chart and / or block diagram, as well as the combination of the flow chart and / or box in the flow chart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for implementing the functions specified in one or more flow charts and / or one or more boxes in the block diagram.

[0283] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a product including an instruction device that implements the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0284] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0285] Obviously, those skilled in the art may make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include these modifications and variations.

Claims

1. A parameter determination method, applied to a terminal device in a satellite communication system, characterized in that: include: receiving first information indicating an association relationship between a first parameter and a second parameter; The first parameter is a parameter related to the coverage of a first satellite, and the second parameter is a parameter related to the coverage of a second satellite; the first satellite is a satellite providing services for the terminal device, and the second satellite is a satellite that will provide services for the terminal device; The second parameter is determined according to the first information and the first parameter.

2. The method according to claim 1, characterized in that The first parameter includes at least one of the following parameters: the ephemeris of the first satellite, the orbit of the first satellite, the coverage of each beam of the first satellite at a set time, the time period during which each beam of the first satellite covers each coverage area, and a parameter obtained by the communication device by measuring a signal of the first satellite within the coverage area of ​​the first satellite; The second parameter includes at least one of the following parameters: the ephemeris of the second satellite, the orbit of the second satellite, the coverage range of each beam of the second satellite at a set time, the time period in which each beam of the second satellite covers each coverage range, and the parameter that the communication device expects to obtain by measuring the signal of the second satellite within the coverage range of the second satellite.

3. The method according to claim 1 or 2, characterized in that The first information includes: a first time interval and a first indication; The first time interval is the difference between two moments; The first indication is used to indicate that the association relationship includes: a first value is less than or equal to a first threshold; wherein the first value is a value determined based on the difference between two strengths; the two strengths include: the strength of the signal from the first satellite detected by a communication device located in the first area at one of the two moments, and the strength of the signal from the second satellite expected to be detected by the communication device located in the first area at the other of the two moments; the first area is an area within the coverage range of the first satellite.

4. The method according to claim 3, characterized in that The first parameter includes a first strength of a signal from the first satellite detected by the terminal device at a first moment, Determining the second parameter according to the first information and the first parameter includes: A second strength of the signal from the second satellite that the terminal device is expected to detect at a second moment is determined based on the first time interval and the first strength, where the difference between the second moment and the first moment is the first time interval.

5. The method according to claim 4, characterized in that The first information further includes: a first offset, the first offset being used to indicate an offset between the two intensities; Determining, based on the first time interval and the first strength, a second strength of a signal from the second satellite that the terminal device is expected to detect at a second moment, includes: The second intensity is determined according to the first time interval, the first intensity, and the first offset.

6. The method according to claim 1 or 2, characterized in that The first information includes: the second time interval and a second indication; The second time interval is the difference between two moments; The second indication is used to indicate that the association relationship includes: a second value is less than or equal to a second threshold; wherein the second value is a value determined based on the difference between two frequency offsets; the two frequency offsets include: the frequency offset of the signal from the first satellite detected by a communication device located in the second area at one of the two moments, and the frequency offset of the signal from the second satellite expected to be detected by a communication device located in the second area at the other of the two moments; the second area is an area within the coverage range of the first satellite.

7. The method according to claim 6, characterized in that The first parameter includes a first frequency offset of a signal of the first satellite detected by the terminal device at a third time. Determining the second parameter according to the first information and the first parameter includes: A second frequency offset of a signal from the second satellite detected by the terminal device at a fourth moment is determined based on the second time interval and the first frequency offset, where a difference between the fourth moment and the third moment is the second time interval.

8. The method according to claim 7, characterized in that The first information further includes: a second offset, the second offset being used to indicate an offset between the two frequency offsets; Determining, based on the second time interval and the first frequency offset, a second frequency offset of a signal from the second satellite detected by the terminal device at a fourth moment, includes: The second frequency offset is determined according to the second time interval, the first frequency offset, and the second offset.

9. The method according to claim 1 or 2, characterized in that The first information includes: a third time interval and a third indication; The third time interval is at least one of the following: a difference between expected start times of two time periods, a difference between expected end times of the two time periods, a difference between an expected end time of one of the two time periods and an expected start time of the other of the two time periods; The two time periods include: a time period when the first satellite covers a third area, and a time period when the second satellite covers the third area; wherein the third area is an area within the coverage range of the first satellite; The third indication is used to indicate that the association relationship includes: a third value is less than or equal to a third threshold value, and the third value is a value determined based on the difference between a first duration and a second duration, the first duration is the duration of a time period in which the first satellite covers the third area, and the second duration is the duration of a time period in which the second satellite covers the third area.

10. The method according to claim 9, characterized in that The first parameter includes a first time period during which the terminal device detects a signal from the first satellite, Determining the second parameter according to the first information and the first parameter includes: A second time period during which the terminal device is expected to be able to detect a signal from the second satellite is determined based on the third time interval and the first time period.

11. The method according to claim 10, characterized in that The first information further includes: a third offset, the third offset being used to indicate an offset of the second duration relative to the first duration; Determining, based on the third time interval and the first time period, a second time period during which the terminal device is expected to be able to detect a signal from the second satellite, comprises: The second time period is determined according to the third time interval, the third offset, and the first time period.

12. A parameter determination method, applied to a satellite communication system, characterized in that: include: The first satellite sends first information to the terminal device, where the first information is used to indicate an association relationship between the first parameter and the second parameter; The first parameter is a parameter related to the coverage of a first satellite, and the second parameter is a parameter related to the coverage of a second satellite; the first satellite is a satellite providing services for the terminal device, and the second satellite is a satellite that will provide services for the terminal device; The terminal device determines the second parameter according to the first information and the first parameter.

13. The method according to claim 12, characterized in that The first parameter includes at least one of the following parameters: the ephemeris of the first satellite, the orbit of the first satellite, the coverage of each beam of the first satellite at a set time, the time period during which each beam of the first satellite covers each coverage area, and a parameter obtained by the communication device by measuring a signal of the first satellite within the coverage area of ​​the first satellite; The second parameter includes at least one of the following parameters: the ephemeris of the second satellite, the orbit of the second satellite, the coverage range of each beam of the second satellite at a set time, the time period in which each beam of the second satellite covers each coverage range, and the parameter that the communication device expects to obtain by measuring the signal of the second satellite within the coverage range of the second satellite.

14. The method according to claim 12 or 13, characterized in that The first information includes: a first time interval and a first indication; The first time interval is the difference between two moments; The first indication is used to indicate that the association relationship includes: a first value is less than or equal to a first threshold; wherein the first value is a value determined based on the difference between two strengths; the two strengths include: the strength of the signal from the first satellite detected by a communication device located in the first area at one of the two moments, and the strength of the signal from the second satellite expected to be detected by the communication device located in the first area at the other of the two moments; the first area is an area within the coverage range of the first satellite.

15. The method according to claim 14, characterized in that The first parameter includes a first strength of a signal from the first satellite detected by the terminal device at a first moment, The terminal device determines the second parameter according to the first information and the first parameter, including: The terminal device determines, based on the first time interval and the first strength, a second strength of a signal from the second satellite that the terminal device expects to detect at a second moment, where the difference between the second moment and the first moment is the first time interval.

16. The method according to claim 15, characterized in that The first information further includes: a first offset, the first offset being used to indicate an offset between the two intensities; Determining, by the terminal device, a second strength of a signal from the second satellite that the terminal device is expected to detect at a second moment based on the first time interval and the first strength, includes: The terminal device determines the second intensity according to the first time interval, the first intensity, and the first offset.

17. The method according to claim 12 or 13, characterized in that The first information includes: the second time interval and a second indication; The second time interval is the difference between two moments; The second indication is used to indicate that the association relationship includes: a second value is less than or equal to a second threshold; wherein the second value is a value determined based on the difference between two frequency offsets; the two frequency offsets include: the frequency offset of the signal from the first satellite detected by a communication device located in the second area at one of the two moments, and the frequency offset of the signal from the second satellite expected to be detected by a communication device located in the second area at the other of the two moments; the second area is an area within the coverage range of the first satellite.

18. The method according to claim 17, characterized in that The first parameter includes a first frequency offset of a signal of the first satellite detected by the terminal device at a third time. The terminal device determines the second parameter according to the first information and the first parameter, including: The terminal device determines a second frequency offset of a signal from the second satellite detected by the terminal device at a fourth moment based on the second time interval and the first frequency offset, where a difference between the fourth moment and the third moment is the second time interval.

19. The method according to claim 18, characterized in that The first information further includes: a second offset, the second offset being used to indicate an offset between the two frequency offsets; The terminal device determining, based on the second time interval and the first frequency offset, a second frequency offset of a signal from the second satellite detected by the terminal device at a fourth moment, includes: The terminal device determines the second frequency offset according to the second time interval, the first frequency offset, and the second offset.

20. The method according to claim 12 or 13, characterized in that The first information includes: a third time interval and a third indication; The third time interval is at least one of the following: a difference between expected start times of two time periods, a difference between expected end times of the two time periods, a difference between an expected end time of one of the two time periods and an expected start time of the other of the two time periods; The two time periods include: a time period when the first satellite covers a third area, and a time period when the second satellite covers the third area; wherein the third area is an area within the coverage range of the first satellite; The third indication is used to indicate that the association relationship includes: a third value is less than or equal to a third threshold value, and the third value is a value determined based on the difference between a first duration and a second duration, the first duration is the duration of a time period in which the first satellite covers the third area, and the second duration is the duration of a time period in which the second satellite covers the third area.

21. The method according to claim 20, characterized in that The first parameter includes a first time period during which the terminal device detects a signal from the first satellite, The terminal device determines the second parameter according to the first information and the first parameter, including: The terminal device determines, based on the third time interval and the first time period, a second time period during which the terminal device is expected to be able to detect a signal from the second satellite.

22. The method according to claim 21, characterized in that The first information further includes: a third offset, the third offset being used to indicate an offset of the second duration relative to the first duration; The terminal device determining, based on the third time interval and the first time period, a second time period during which the terminal device is expected to detect a signal from the second satellite, comprising: The terminal device determines the second time period according to the third time interval, the third offset, and the first time period.

23. A parameter determination device, characterized in that: The device comprises a processor and a memory, wherein the processor and the memory are coupled, and the processor is configured to execute computer program instructions stored in the memory, so that the method according to any one of claims 1 to 11 is implemented.

24. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is run on a computer, the method according to any one of claims 1 to 11 is implemented.

25. A chip, characterized in that: The chip is coupled to a memory, and the chip reads a computer program stored in the memory to implement the method according to any one of claims 1 to 11.

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