Communication method and apparatus

Abstract

The present application discloses a communication method and apparatus. The method comprises: a terminal device receives a first system message from an access network device, the first system message comprising first information, and the first information being used for indicating at least one first region within the coverage of the access network device; on the basis of the first information, the terminal device determines that the terminal device is located in the at least one first region; the terminal device sends a random access request to the access network device, the random access request being used for requesting a second system message, and the second system message comprising ephemeris information configured by the access network device; and the terminal device receives the second system message from the access network device. In the method, by determining whether the terminal device is located in the at least one first region within the coverage of the access network device, the terminal device can determine whether the terminal device needs to update the ephemeris information; the terminal device requests a system message only when the ephemeris information needs to be updated, thereby reducing system message overhead.

Description

Communication method and device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on February 1, 2024, with application number 202410146553.1 and application name “A Communication Method and Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of communication technology, and in particular to a communication method and device. Background Art

[0004] Non-terrestrial network (NTN) communications refer to communications achieved with the help of non-terrestrial network equipment. NTN systems can include satellite systems, among others. Introducing NTN communications into mobile network communications, such as fifth-generation (5G) communications, can improve user experience. On the one hand, NTN can provide communication services to areas difficult to reach by terrestrial networks, such as oceans, forests, deserts, and remote areas. On the other hand, NTN can enhance the reliability of mobile communications, such as providing more stable communication services for users in high-speed mobile scenarios such as trains and airplanes. Furthermore, NTN can provide more data transmission resources and support the connection of a larger number of terminal devices.

[0005] In a mobile communication network, the movement of a terminal device can cause the signal quality of the current service cell to deteriorate, and it is necessary to switch to a neighboring cell with better signal quality. In the NTN system, the terminal device can start neighboring cell measurement and perform neighboring cell reselection based on the ephemeris information of the satellite in the neighboring cell. However, the ephemeris information of the satellite in the neighboring cell obtained by the terminal device may be expired. In this case, the terminal device needs to request a system message including the ephemeris information of the satellite in the neighboring cell from the access network device to update the ephemeris information of the satellite in the neighboring cell. Currently, since the terminal device within the coverage area of ​​the satellite in the current service cell will request a system message including the ephemeris information of the satellite in the neighboring cell from the access network device to update the ephemeris information of the satellite in the neighboring cell after the ephemeris information of the satellite in the neighboring cell expires, the system message overhead is large.

[0006] Summary of the Invention

[0007] Embodiments of the present application provide a communication method and apparatus for reducing system message overhead.

[0008] In a first aspect, an embodiment of the present application provides a communication method, which can be applied to a terminal device or a component in a terminal device (such as a unit / module, circuit or chip, etc.). Taking the terminal device as an example, the method includes: the terminal device can receive a first system message from an access network device, the first system message including first information, and the first information is used to indicate at least one first area within the coverage range of the access network device; the terminal device can determine that the terminal device is located in the at least one first area based on the first information; the terminal device can send a random access request to the access network device, and the random access request is used to request a second system message, and the second system message includes ephemeris information configured by the access network device; the terminal device can receive the second system message from the access network device.

[0009] In the implementation of this application, the terminal device can determine whether the terminal device needs to update the ephemeris information (for example, the ephemeris information of satellites in a neighboring area) by determining whether the terminal device is located in at least one first area (for example, also known as an edge area) within the coverage range of the access network device. If the terminal device is located in at least one first area within the coverage range of the access network device, the terminal device can determine that the ephemeris information needs to be updated. Only then will the terminal device request a second system message from the access network device to update the ephemeris information. Since the terminal device only requests a system message when it needs to update the ephemeris information, the system message overhead is reduced.

[0010] In one possible embodiment, the first information may include one or more of the following information: the number of at least one first wave position, the at least one first wave position belongs to the at least one first area; the index of at least one first synchronization signal / broadcast signal block SSB, the at least one first SSB corresponds to the at least one first area; second information and third information, the second information is used to indicate a first correspondence, the first correspondence is the correspondence between at least one second area and at least one second SSB within the coverage range of the access network device within the first time period, the third information is used to indicate the at least one first area included in the at least one second area; fourth information, the fourth information is used to indicate a first distance range, the first distance range is the distance range between the terminal device and the access network device when it is located in the at least one first area.

[0011] In this embodiment, multiple ways are provided for the first information to indicate at least one first area within the coverage of the access network device, so that the way in which the access network device indicates at least one first area within the coverage of the access network device is more flexible, and accordingly, the way in which the terminal device determines at least one first area within the coverage of the access network device is also more flexible.

[0012] In one possible implementation, the first information includes the number of the at least one wave position; the terminal device can determine that the terminal device is located in the at least one first area based on the number of the at least one wave position and the number of the wave position corresponding to the terminal device.

[0013] In this embodiment, a method is provided for determining whether a terminal device is located in at least one first area within the coverage of an access network device based on first information. For example, the coverage of a first beam is the first area, and the coverage of the first beam is the first wavelength, that is, the first wavelength belongs to the first area. If the wavelength corresponding to the terminal device is the first wavelength, then the terminal device is determined to be located in the first area.

[0014] In one possible implementation, the first information includes an index of the at least one SSB; the terminal device can determine that the terminal device is located in the at least one first area based on the index of the at least one SSB and the index of the SSB corresponding to the terminal device.

[0015] In this embodiment, a method is provided for determining whether a terminal device is located in at least one first area within the coverage of an access network device based on first information. For example, the first beam may be indicated by the index of the first SSB transmitted on the first beam, and the coverage of the first beam (i.e., the first area) may also be indicated by the index of the first SSB transmitted on the first beam. If the SSB corresponding to the terminal device is the first SSB, it is determined that the terminal device is located in the first area.

[0016] In one possible implementation, the first information includes the second information and the third information, and the correspondence between at least one second area within the coverage of the access network device and at least one second SSB is not related to the current time; the terminal device can determine that the terminal device is located in the at least one first area based on the first correspondence and the index of the SSB corresponding to the terminal device.

[0017] In this embodiment, when the correspondence between at least one second area within the coverage of the access network device and at least one second SSB is not related to the current time, a method for determining whether the terminal device is located in at least one first area within the coverage of the access network device based on the first information is provided. For example, if the current time is within the first time period or the second time period, the correspondence between the at least one second area within the coverage of the access network device and the at least one second SSB remains unchanged, and the terminal device can directly determine whether the terminal device is located in at least one first area within the coverage of the access network device based on the first correspondence.

[0018] In one possible implementation, the first information includes the second information and the third information, and the correspondence between at least one second area within the coverage of the access network device and at least one second SSB is related to the current time; the terminal device can determine that the terminal device is located in the at least one first area based on the first correspondence and the index of the SSB corresponding to the terminal device when the current time is in the first time period; or, the terminal device can determine the second correspondence based on the first correspondence when the current time is in the second time period, and determine that the terminal device is located in the at least one first area based on the second correspondence and the index of the SSB corresponding to the terminal device, the second correspondence being the correspondence between the at least one second area and the at least one second SSB within the second time period, and the second time period being after the first time period.

[0019] In this embodiment, when the correspondence between at least one second area within the coverage of the access network device and at least one second SSB is related to the current time, two methods are provided for determining whether the terminal device is located in at least one first area within the coverage of the access network device based on the first correspondence, depending on whether the current time is in the first time period or the second time period. For example, if the current time is in the first time period, the correspondence between at least one second area within the coverage of the access network device and at least one second SSB remains unchanged, and the terminal device can directly determine whether the terminal device is located in at least one first area within the coverage of the access network device based on the first correspondence; if the current time is in the second time period, the correspondence between at least one second area within the coverage of the access network device and at least one second SSB has changed, and the terminal device may need to first determine the second correspondence based on the first correspondence, and then determine whether the terminal device is located in at least one first area within the coverage of the access network device based on the second correspondence. This makes the method for the terminal device to determine whether the terminal device is located in at least one first area within the coverage of the access network device more flexible, and improves the accuracy of the terminal device in determining whether the terminal device is located in at least one first area within the coverage of the access network device.

[0020] In a possible implementation, the terminal device may quickly and accurately determine the second corresponding relationship based on the start time of the first time period, the duration of the first time period, and the first corresponding relationship.

[0021] In one possible implementation, the first information includes the fourth information; the terminal device can determine that the terminal device is located in the at least one first area based on the first distance range and the distance between the terminal device and the access network device.

[0022] In this embodiment, a method is provided for determining whether the terminal device is located in at least one first area within the coverage of the access network device based on the first information. For example, the fourth information may indicate the maximum horizontal distance threshold d max1 , maximum vertical distance threshold d max2 , minimum horizontal distance threshold d min1 and the minimum vertical distance threshold d min2 To indicate the first distance range. If the horizontal distance between the terminal device and the access network device is d1, and the horizontal distance between the terminal device and the access network device is d2, then when d min1 ≤d1≤d max1 , and d min2 ≤d2≤d max2 When the terminal device is located in at least one first area within the coverage area of ​​the access network device.

[0023] In a possible implementation manner, the first system message further includes fifth information, where the fifth information is used to indicate that the terminal device needs to request the second system message when located in the at least one first area.

[0024] In this embodiment, the access network device can indicate through the fifth information that the terminal device only needs to request the second system message when it is located in at least one first area within the coverage of the access network device, thereby reducing system message overhead.

[0025] In a second aspect, an embodiment of the present application also provides a communication method, which can be applied to an access network device or a component in the access network device (such as a unit / module, circuit or chip, etc.). Taking the access network device as an example, the method includes: the access network device can send a first system message to the terminal device, and the first system message includes first information, and the first information is used to indicate at least one first area within the coverage range of the access network device; the access network device can receive a random access request from the terminal device, and the random access request is used to request a second system message, and the second system message includes ephemeris information configured by the access network device; the access network device can send the second system message to the terminal device.

[0026] In one possible embodiment, the first information may include one or more of the following information: the number of at least one first wave position, the at least one first wave position belongs to the at least one first area; the index of at least one first synchronization signal / broadcast signal block SSB, the at least one first SSB corresponds to the at least one first area; second information and third information, the second information is used to indicate a first correspondence, the first correspondence is the correspondence between at least one second area and at least one second SSB within the coverage range of the access network device within the first time period, the third information is used to indicate the at least one first area included in the at least one second area; fourth information, the fourth information is used to indicate a first distance range, the first distance range is the distance range between the terminal device and the access network device when it is located in the at least one first area.

[0027] In a possible implementation, the first system message may further include fifth information, where the fifth information is used to indicate that the terminal device needs to request the second system message when located in the at least one first area.

[0028] The beneficial effects of the above-mentioned second aspect and its embodiments can refer to the beneficial effects of the first aspect and any one of its embodiments.

[0029] In a third aspect, embodiments of the present application provide a communication device comprising a processor and a memory; the memory is configured to store computer instructions, and when the device is running, the processor executes the computer instructions stored in the memory to cause the device to perform any of the implementation methods described in the first or second aspects above. The memory can be volatile or non-volatile memory, such as a cache memory in a semiconductor chip.

[0030] In a fourth aspect, embodiments of the present application provide a communications device, which may be a terminal device or an access network device, or a chip for a terminal device or an access network device. The device has the function of implementing any of the implementation methods described in the first or second aspects above. The function may be implemented in hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions.

[0031] In a fifth aspect, an embodiment of the present application provides a communication device, comprising a unit or means for executing each step of any implementation method in the above-mentioned first aspect or second aspect.

[0032] In a sixth aspect, an embodiment of the present application provides a communication device, comprising a processor and an interface circuit, wherein the processor is configured to communicate with other devices via the interface circuit and execute any implementation method of the first or second aspect described above. The processor may be one or more processors.

[0033] In a seventh aspect, an embodiment of the present application provides a communication device, comprising a processor coupled to a memory, the processor configured to call a program stored in the memory to execute any of the implementation methods of the first or second aspects described above. The memory may be located within or outside the device. The processor may also be one or more processors.

[0034] In an eighth aspect, an embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores instructions, which, when run on a communication device, enables any implementation method in the above-mentioned first aspect or second aspect to be executed.

[0035] In the ninth aspect, an embodiment of the present application further provides a computer program product, which includes a computer program or instructions. When the computer program or instructions are run by a communication device, any implementation method in the above-mentioned first aspect or second aspect is executed.

[0036] In the tenth aspect, an embodiment of the present application also provides a chip system, including: a processor, used to execute any implementation method in the above-mentioned first aspect or second aspect.

[0037] In the eleventh aspect, an embodiment of the present application also provides a communication system, which includes: a terminal device for executing any implementation method executed by the terminal device in the first aspect or the second aspect above; and an access network device for executing any implementation method executed by the access network device in the first aspect or the second aspect above. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] 1A to 1D are schematic diagrams of several architectures of communication systems applicable to embodiments of the present application;

[0039] FIG2 is a schematic diagram of a satellite coverage area provided in an embodiment of the present application;

[0040] FIG3 is a flow chart of a communication method provided in an embodiment of the present application;

[0041] 4A to 4D are schematic diagrams of several corresponding relationships provided in embodiments of the present application;

[0042] FIG4E is a flowchart of another communication method provided in an embodiment of the present application;

[0043] FIG5 is a schematic diagram of a communication device 500 provided in an embodiment of the present application;

[0044] FIG6 is a schematic diagram of a communication device 600 provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] 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 further described in detail below with reference to the accompanying drawings.

[0046] The method provided in the embodiment of the present application can be applied to non-terrestrial networks (NTN) communication scenarios. In the NTN communication scenario, non-terrestrial access network devices such as drones, high altitude platform stations (HAPS), and satellites can provide data transmission, voice communication and other services for terminal devices. In addition, the NTN system may also include other non-terrestrial access network devices, which is not limited in this application. The NTN communication scenario can also support various mobile communication systems, such as: new radio (NR) system, long term evolution (LTE) system or other communication systems such as future communication systems, which are not limited here.

[0047] The method provided in the embodiments of the present application can be applied to at least one of the following: a fourth-generation (4G) communication system (e.g., an LTE system), a fifth-generation (5G) communication system (e.g., an NR system), or various future communication systems (e.g., a sixth-generation (6G) communication system). The communication method provided in the embodiments of the present application can also be applied to vehicle-to-everything (V2X) communication, vehicle networking, autonomous driving, or assisted driving.

[0048] This application will present various aspects, embodiments, or features around systems including multiple devices, components, modules, etc. It should be understood and appreciated that each system may include additional devices, components, modules, etc., and / or may not include all of the devices, components, modules, etc. discussed in conjunction with the figures. Furthermore, combinations of these aspects may also be used.

[0049] To facilitate understanding, a communication system to which the embodiments of the present application can be applied is first described.

[0050] Figure 1A is a schematic diagram of a communication system to which an embodiment of the present application can be applied. As shown in Figure 1A, the communication system may include at least one access network device (such as 110a, 110b, 110c in Figure 1A), and may also include at least one terminal device (such as 120a-120g in Figure 1A). The terminal device may be mobile or fixed. Each access network device can provide communication coverage for a specific geographical area and can communicate with terminal devices located within the coverage area. Access network devices and access network devices, access network devices and terminal devices, and terminal devices and terminal devices can be connected to each other via wired or wireless means. Figure 1A is only a schematic diagram, and the communication system may also include other devices, such as wireless relay devices and wireless backhaul devices.

[0051] The embodiments of the present application may be applicable to a communication system that integrates a terrestrial communication system and a satellite communication system, which may also be referred to as an NTN communication system.

[0052] Among them, the terrestrial communication system can be, for example, an LTE system, a universal mobile telecommunications system (UMTS), a 5G communication system, or various future communication systems (for example, 6G) communication systems, etc., which are not limited here.

[0053] Among them, satellite communication systems have a wider coverage area than traditional communication systems and can overcome natural geographical obstacles such as oceans, deserts, and mountains. In order to overcome the shortcomings of traditional communication systems, satellite communication systems can serve as an effective supplement to traditional communication systems. Satellite communication systems can be divided into the following three types according to the different orbital altitudes: geostationary earth orbit (GEO) satellite communication systems, medium earth orbit (MEO) satellite communication systems, and low earth orbit (LEO) satellite communication systems. GEO satellite communication systems are also called synchronous orbit satellite systems. It is generally believed that compared with terrestrial communications, NTN has different channel characteristics (for example, large transmission delay, Doppler frequency deviation, etc.). For example, the round-trip delay of the GEO satellite communication system is 238 to 270 milliseconds (ms), and the round-trip delay of the LEO satellite communication system is 8ms to 20ms.

[0054] Satellite operating modes can be categorized as transparent or regenerative. When operating in transparent mode, a satellite performs relay functions. Gateway stations have some or all of the functions of base stations, and in this case, gateway stations can be considered base stations. When operating in regenerative mode, a satellite has data processing capabilities and some or all of the functions of a base station, and in this case, the satellite can be considered a base station.

[0055] Figure 1B is a schematic diagram of an NTN in regeneration mode. As shown in Figure 1B, a satellite has some or all of the functions of a base station and can be called a satellite base station. The satellite base station can provide wireless access services and schedule wireless resources for terminal devices that access the network through the satellite base station. The satellite base station and the terminal device can communicate via the user-universal terrestrial radio access network-user (Uu) interface. Specifically, the satellite base station and the core network (CN) can communicate via the next generation network (NG) interface. The satellite base station and the core network can exchange the core network's non-access stratum (NAS) signaling and user service data via the NG interface. The satellite radio interface (SRI) interface is the feeder link between the NTN gateway and the satellite. In Figure 1B, the SRI interface can be used as part of the next generation network (NG) interface to implement communication interaction between the satellite base station and the core network.

[0056] Figure 1C is a schematic diagram of the NTN in transparent transmission mode. As shown in Figure 1C, terminal devices communicate with ground base stations via the Uu interface. Satellites enable transparent payload transmission between the terminal devices and the ground base stations. The satellites and NTN gateways can be considered the remote radio units (RRUs) of the ground base stations, enabling transparent signal forwarding. Specifically, the satellite supports functions such as RF filtering, frequency conversion, and amplification, while maintaining the same signal waveform. Satellite forwarding is transparent to the terminal devices. Furthermore, the ground base stations and the CN can communicate via the NG interface, exchanging core network NAS signaling and terminal device service data.

[0057] Figure 1D is a schematic diagram of a satellite communication scenario. As shown in Figure 1D, in the satellite communication scenario, the access network equipment includes a satellite and a gateway. Terminal devices include Internet of Things terminal devices, mobile terminal devices, and high-altitude aircraft, etc. The terminal devices can also be terminal devices of other forms and performances, etc., which are not limited here. The link between the satellite and the terminal device is called a service link, and the link between the satellite and the gateway is called a feeder link. The gateway station can also be called a signal gateway station. It should be noted that the embodiments of the present application can also be applied to the satellite communication scenario expanded based on Figure 1D.

[0058] In this application, terminal equipment may also be referred to as user equipment (UE), access terminal equipment, subscriber unit, user station, mobile station, mobile station (MS), remote station, remote terminal equipment, mobile device, user terminal equipment, wireless communication equipment, user agent or user device.

[0059] The terminal device may be a device that provides wireless communication functions, such as a handheld device or a vehicle-mounted device with a wireless connection function. At present, some examples of terminal devices are: mobile phones, satellite mobile terminal devices, cellular phones, smart phones, tablet computers, laptop computers, PDAs, mobile internet devices (MIDs), wearable devices (such as smart watches, smart bracelets, pedometers, smart glasses, etc.), vehicle-mounted devices (such as cars, bicycles, electric vehicles, airplanes, ships, trains, high-speed railways, etc.), satellite terminal devices, virtual reality (VR) devices, augmented reality (AR) devices, smart point of sale (POS) machines, customer-premises equipment (CPE), wireless terminal devices in industrial control, wireless terminal devices in self-driving, wireless terminal devices in remote medical surgery, wireless terminal devices in smart grids, wireless terminal devices in transportation safety, wireless terminal devices in smart cities, and smart homes. The present invention also includes wireless terminal devices (e.g., refrigerators, televisions, air conditioners, electric meters, etc.) in a home, intelligent robots, robotic arms, cellular 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 a wireless modem, flying devices (e.g., intelligent robots, hot air balloons, drones, airplanes), terminal devices in 5G networks, or terminal devices in future-evolved public land mobile networks (PLMNs), etc., which are not limited in the embodiments of the present application. As an example and not a limitation, in the embodiments of the present application, the terminal device may also be a mobile terminal device (mobile termination, MT) in an integrated access and backhaul (IAB) node.When the IAB node faces its parent node, it can be regarded as a terminal device. In this case, the IAB node plays the role of MT.

[0060] The embodiments of this application do not limit the device form factor of the terminal device. The device used to implement the functions of the terminal device can be the terminal device; it can also be a device that supports the terminal device to implement the functions, such as a chip system. The device can be installed in the terminal device or used in conjunction with the terminal device. In the embodiments of this application, the chip system can be composed of a chip or include a chip and other discrete components.

[0061] In this application, an access network device is a device that provides wireless communication functions for a terminal device, and the terminal device can communicate with the core network device through the access network device. As a node in the wireless access network, the access network device can also be called a base station, a radio access network (RAN) node (or device), or an access point (AP). A communication system may include multiple access network devices, which can be nodes of the same type or different types. In some scenarios, the roles of the access network device and the terminal device are relative. For example, network element #A can be a helicopter or a drone, which can be configured as a mobile base station and access the RAN through network element #B. For those terminal devices that access the RAN through network element #A, network element #A is a base station; but for network element #B, network element #A is a terminal device.

[0062] In one possible scenario, the access network device may be a base station, a transmitting and receiving point (TRP), a transmitting point (TP), a next-generation base station in a 6G mobile communication system, a base station in a future mobile communication system, a satellite, an IAB node, a mobile switching center, a high-altitude platform or a satellite, etc. The access network device may be a macro base station, a micro base station or an indoor station, a relay node or a donor node, or a wireless controller in a cloud RAN (CRAN) scenario. The access network device may also be a device that acts as a base station in sidelink communication, vehicle-to-vehicle communication, drone communication, or machine communication. Optionally, the access network device may also be a server, a wearable device, a vehicle or an on-board device, etc. For example, the access network device in V2X technology may be a road side unit (RSU).

[0063] In another possible scenario, multiple access network devices collaborate to assist terminal devices in achieving wireless access, and different access network devices respectively implement part of the functions of the base station. For example, the access network device can be a centralized unit (CU), DU, CU-control plane (CP), CU-user plane (UP), or radio unit (RU). The CU and DU can be set separately, or can also be included in the same network element, such as a baseband unit (BBU). The RU can be included in a radio frequency device or radio frequency unit, such as a remote radio unit (RRU), an active antenna unit (AAU), or a remote radio head (RRH). It can be understood that the access network device can be a CU node, a DU node, or a device including a CU node and a DU node. In addition, the CU can be divided into an access network device in the access network RAN, or the CU can be divided into an access network device in the core network CN, which is not limited here.

[0064] In different systems, CU (or CU-CP and CU-UP), DU or RU may also have different names, but those skilled in the art can understand their meanings. For example, in the ORAN system, CU may also be called O-CU (Open CU), DU may also be called O-DU, CU-CP may also be called O-CU-CP, CU-UP may also be called O-CU-UP, and RU may also be called O-RU. For the convenience of description, this application uses CU, CU-CP, CU-UP, DU and RU as examples for description. Any unit of CU (or CU-CP, CU-UP), DU and RU in this application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0065] In the embodiments of the present application, the form of the access network device is not limited. The device used to implement the functions of the access network device can be the access network device; it can also be a device that supports the access network device to implement the functions, such as a chip system. The device can be installed in the access network device or used in conjunction with the access network device.

[0066] Access network equipment and terminal devices can be fixed or mobile. They can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; on water; or in the air on aircraft, balloons, and satellites. The embodiments of this application do not limit the application scenarios of access network equipment and terminal devices.

[0067] The communication system and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. A person skilled in the art will appreciate that, with the evolution of network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0068] The following first explains the relevant technologies involved in the embodiments of this application. It should be noted that these explanations are intended to make the embodiments of this application easier to understand and should not be regarded as limiting the scope of protection claimed by this application.

[0069] 1) Satellite coverage

[0070] Considering the advantages of satellites, such as being less susceptible to natural disasters or external damage, research is currently underway to use satellites as access network equipment (such as base stations) for mobile communication systems, in order to provide communication services to areas such as oceans and forests. Unlike terrestrial access network equipment, in order to support wider service coverage, satellites have a larger coverage area, which may result in most areas within the satellite's coverage area being without terminal equipment, such as deserts, oceans, and uninhabited areas. As shown in Figure 2, a schematic diagram of a satellite coverage area provided in an embodiment of the present application shows that only three beams under multiple beams have terminal equipment within their coverage area.

[0071] 2) System Information (SI)

[0072] System messages consist of a master information block (MIB) and multiple system information blocks (SIBs). System messages can be further divided into minimum system information (MSI) and other system information (OSI).

[0073] The minimum system message includes the basic information required for initial access and information for obtaining any other system messages. The minimum system message includes MIB and SIB1. Among them, MIB contains cell barring status information and configuration information required for further receiving system messages, such as control resource set (CORSET) #0 configuration. MIB is broadcast periodically through the broadcast channel (BCH). SIB1 contains scheduling information of other SIBs and basic information required for initial access. SIB1 is also called the remaining minimum system information (RMSI). SIB1 is broadcast periodically through the downlink shared channel (DL-SCH) or sent to terminal devices in the radio resource control (RRC) connected state (RRC_CONNECTED) through dedicated signaling.

[0074] Other system messages include all SIBs not broadcast in the minimum system messages. These SIBs can be broadcast periodically on the DL-SCH, on-demand on the DL-SCH, i.e., a terminal device in RRC idle state (RRC_IDLE), RRC inactive state (RRC_INACTIVE), or RRC_CONNECTED sends a request to the network side, or sent in a dedicated manner on the DL-SCH to a terminal device in RRC_CONNECTED.

[0075] The SIBs related to cell reselection include: SIB2, SIB3 and SIB4. Among them, SIB2 contains cell reselection information, which is mainly related to the serving cell; SIB3 contains the serving frequency and co-frequency neighboring cell information related to cell reselection (including cell reselection parameters common to the frequency and cell-specific reselection parameters); SIB4 contains information about other NR frequencies and inter-frequency neighboring cells related to cell reselection (including cell reselection parameters common to the frequency and cell-specific reselection parameters), which can also be used for NR idle / inactive state measurements;

[0076] The SIB currently carrying ephemeris information is SIB19 (NR NTN) or SIB31 (Internet of Things (IoT) NTN). SIB19 contains the information required for cell access in the NTN system, primarily including ephemeris information for the serving cell's satellite, ephemeris information for neighboring cells, the serving cell's reference position, range threshold, remaining service time, and other parameters. The satellite's ephemeris information includes orbital parameters, or parameters such as the satellite's position calculated based on the orbital parameters. It is understood that the satellite's ephemeris information can be used to calculate, predict, depict, or track the satellite's flight time, position, speed, and other states.

[0077] Exemplarily, the scheduling information in SIB1 may include one or more of the following information: a system message window, the system message window including multiple time slots for transmitting other system messages, the SIBs included in the other system messages; whether the other system messages are broadcast (broadcasting) or non-broadcast (notBroadcasting) types. When the terminal device needs any SIB, the terminal device can determine another system message (such as OSI#1) including the SIB based on the scheduling information in SIB1. If OSI#1 is of broadcast type, the terminal device can blindly detect in the system message window #1 corresponding to OSI#1 to receive OSI#1. If OSI#1 is of non-broadcast type, the terminal device can initiate a system message request to the access network device, requesting the access network device to send OSI#1. For example, if the access network device configures a dedicated random access resource for the terminal device, the terminal device can send a specific random access preamble (preamble) to the access network device to request the network side to send OSI#1. After receiving the random access preamble, the access network device sends a random access response (RAR) and sends OSI#1 in the system message window #1 corresponding to OSI#1. After receiving the random access response, the terminal device receives OSI#1 in the system message window #1 corresponding to OSI#1.

[0078] In a mobile communication network, the movement of a terminal device can cause the signal quality of the current serving cell to deteriorate, necessitating a switch to a neighboring cell with better signal quality. In an NTN system, a terminal device can use the ephemeris information of the neighboring cell's satellites to initiate neighboring cell measurements and perform neighboring cell reselection. However, the ephemeris information of the neighboring cell's satellites obtained by the terminal device may be out of date. In this case, the terminal device needs to request a system message from the access network device containing the ephemeris information of the neighboring cell's satellites to update the ephemeris information of the neighboring cell's satellites. Currently, terminal devices within the coverage area of ​​the current serving cell's satellites request a system message containing the ephemeris information of the neighboring cell's satellites from the access network device to update the ephemeris information of the neighboring cell's satellites after the ephemeris information of the neighboring cell's satellites expires. However, in reality, except for terminal devices located in areas at the edge of the current serving cell's satellite coverage area, other terminal devices do not need to update the ephemeris information of the neighboring cell's satellites. Therefore, if all terminal devices within the current serving cell's satellite coverage area request a system message containing the ephemeris information of the neighboring cell's satellites from the access network device, a large amount of unnecessary system message overhead will be generated, resulting in high system message overhead.

[0079] In view of this, an embodiment of the present application provides a communication method to reduce system message overhead.

[0080] In the embodiments of this application, "when," "if," and "if" all indicate that the device will perform a corresponding action under certain objective circumstances. They do not limit the time, do not require the device to perform a judgment action when implemented, and do not imply any other limitations. Unless otherwise specified, "if" and "if" are interchangeable, and "when" and "under the circumstances" are interchangeable. "When" and "if" are interchangeable.

[0081] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "exemplary" or "for example" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0082] In this document, “used to indicate” can include being used for direct indication and being used for indirect indication. For example, when describing that a certain indication information is used to indicate information I, it can include that the indication information directly indicates I or indirectly indicates I, but it does not mean that the indication information must carry I.

[0083] The information indicated by the indication information is called information to be indicated. In the specific implementation process, there are many ways to indicate the information to be indicated, such as but not limited to, directly indicating the information to be indicated, such as the information to be indicated itself or the index of the information to be indicated. The information to be indicated can also be indirectly indicated by indicating other information, wherein there is an association between the other information and the information to be indicated. It is also possible to indicate only a part of the information to be indicated, while the other parts of the information to be indicated are known or agreed in advance. For example, it is also possible to use the arrangement order of each piece of information that is pre-agreed (such as specified by the protocol) to achieve the indication of specific information, thereby reducing the indication overhead to a certain extent. At the same time, it is also possible to identify the common parts of each piece of information and indicate them uniformly to reduce the indication overhead caused by indicating the same information separately. For example, those skilled in the art should understand that the precoding matrix is ​​composed of precoding vectors, and the precoding vectors in the precoding matrix may have the same parts in terms of composition or other properties.

[0084] In addition, the specific indication method can also be various existing indication methods, such as but not limited to the above-mentioned indication methods and various combinations thereof. The specific details of the various indication methods can be referred to the prior art and will not be repeated herein. As can be seen from the above, for example, when it is necessary to indicate multiple information of the same type, there may be a situation where the indication methods for different information are different. In the specific implementation process, the required indication method can be selected according to specific needs. The embodiment of the present application does not limit the selected indication method. In this way, the indication method involved in the embodiment of the present application should be understood to cover various methods that can enable the party to be indicated to obtain the information to be indicated.

[0085] In the embodiments of the present application, "sending" and "receiving" indicate the direction of signal transmission. For example, "sending information to XX" can be understood as the destination of the information being XX, which can include direct sending through the air interface, and indirect sending through the air interface by other units or modules. "Receiving information from YY" can be understood as the source of the information being YY, which can include direct receiving from YY through the air interface, and indirect receiving from YY through the air interface from other units or modules. "Sending" can also be understood as the "output" of the chip interface, and "receiving" can also be understood as the "input" of the chip interface.

[0086] In other words, sending and receiving can be performed between devices, for example, between access network equipment and terminal equipment, or can be performed within a device, for example, sending or receiving between components, modules, chips, software modules or hardware modules within the device through a bus, wiring or interface.

[0087] It is understandable that information may be processed between the source and destination of information transmission, such as coding, modulation, etc., but the destination can understand the valid information from the source. Similar expressions in this application can be understood similarly and will not be repeated.

[0088] 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 "plural" means two or more. "And / or" describes the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. For example, A / B means: A or B. "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. For example, at least one of a, b, or c means: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, c can be single or multiple.

[0089] The ordinal numbers such as "first" and "second" mentioned in the embodiments of this application are used to distinguish multiple objects, and are not used to limit the size, content, order, timing, priority or importance of multiple objects. For example, the first information and the second information refer to two different information, and do not indicate the difference in content, priority or importance of the two information. For a technical feature, "A", "B", "C" and "D" are used to distinguish the technical features in the technical feature. There is no order of precedence or size between the technical features described by "A", "B", "C" and "D".

[0090] The solution provided by the embodiment of the present application is described in detail below with reference to the accompanying drawings. In the following description, the communication method provided by the embodiment of the present application is applied to the communication system shown in Figure 1A as an example. The communication system and application scenario described in the embodiment of the present application are intended to more clearly illustrate the technical solution of the embodiment of the present application, and do not constitute a limitation on the technical solution provided by the embodiment of the present application. It is known to those skilled in the art that with the evolution of the communication system and the emergence of new application scenarios, the technical solution provided by the embodiment of the present application is also applicable to similar technical problems.

[0091] The following describes the communication method provided in the embodiment of the present application by an access network device and a terminal device as an example. The steps performed by the access network device can be implemented by the access network device itself, or by components in the access network device (such as baseband chips, or other processing units or processor modules). For example, the access network device can be the access network device in Figure 1A, such as access network devices 110a, 110b, 110c, etc., or it can also be a chip (system) in the access network device in Figure 1A. The steps performed by the terminal device can be implemented by the terminal device itself, or by components in the terminal device (such as chips, processing units, or processor modules). The terminal device can be the terminal device shown in Figure 1A, such as terminal devices 120a-120g, etc., or it can also be a chip (system) in the terminal device in Figure 1A.

[0092] For example, refer to Figure 3, which is a flow chart of a communication method provided by an embodiment of the present application. Figure 3 introduces the method from the perspective of the interaction between the access network device and the terminal device. It should be understood that the communication method can also be implemented by other devices, such as a chip or communication device with communication functions. It should be noted that the embodiment of the present application only takes the execution through the access network device and the terminal device as an example, and is not limited to the access network device and the terminal device. For example, the embodiment of the present application can also be executed by more terminal devices. When more terminal devices are involved, the execution process of each terminal device in these more terminal devices is the same. As shown in Figure 3, the process of the communication method includes the following steps.

[0093] S301. The access network device sends a first system message to the terminal device. Correspondingly, the terminal device receives the first system message from the access network device.

[0094] In an embodiment of the present application, the first system message may include first information, which may be used to indicate at least one first area (also known as an edge area) within the coverage area of ​​the access network device. The embodiment of the present application does not limit the specific names of the first information and the first area. The first system message may be a traditional system information block, such as SIB1, SIB19, or other system information; or, the first system information may also be a new system information block, such as system information block 1bis (SIB1bis). It should be understood that SIB1bis may also have other names, such as system information block 1' (SIB1').

[0095] The term "region" can be a geographic area, geographic range, administrative area, administrative range, or beam position. A beam position can be the coverage area of ​​a beam (or the projection of a beam on the ground). Access network devices can adjust antenna weights to point beams in different directions and achieve different coverage areas. For example, an access network device is configured with 16 beams, each with a different coverage area. The coverage area of ​​a beam can be one beam position.

[0096] During specific implementation, the first information may indicate at least one first area within the coverage area of ​​the access network device by including but not limited to one or more of the following information:

[0097] 1) The number of at least one first wave position (also called edge wave position). For example, the number of the at least one first wave position included in the first information can be directly {0, 1, 6, 7, 8, 9, 14}, or the number of the at least one first wave position included in the first information can be presented in the form of a bit map, for example, {01001010} represents the 2nd first wave position, the 5th first wave position and the 7th first wave position, that is, wave position #1, wave position #4 and wave position #6. Among them, at least one first wave position belongs to at least one first area, and the embodiment of the present application does not limit the specific name of the first wave position. The first wave position belonging to the first area can be understood as: the coverage range of the first beam is the first area, and the coverage range of the first beam is the first wave position.

[0098] For example, an access network device is configured with three beams: beam #1, beam #2, and beam #3. Beam #1 covers beam position #1, beam #2 covers beam position #2, and beam #3 covers beam position #3. Beam position #1, beam position #2, and beam position #3 belong to the access network device's coverage. For example, beam position #1 belongs to area #1 within the access network device's coverage, beam position #2 belongs to area #2 within the access network device's coverage, and beam position #3 belongs to area #3 within the access network device's coverage. Alternatively, the ground is divided into three regions based on geographic areas: region 1 is beam position 1, region 2 is beam position 2, and region 3 is beam position 3. Therefore, the access network device can indirectly indicate region #1 by indicating beam position #1, indirectly indicate region #2 by indicating beam position #2, and indirectly indicate region #3 by indicating beam position #3.

[0099] It is understood that when the beam weight and beam direction of the access network device are related to the location of the access network device, the beam of the access network device does not move with the access network device (i.e., it is geostationary). In this case, the coverage range of the beam of the access network device remains unchanged, i.e., the beam position remains unchanged. The access network device can indirectly indicate the area to which the beam position belongs by indicating the beam position.

[0100] However, if the beam weight and beam direction of an access network device are not related to the access network device's location, the access network device's beam will move with the access network device (i.e., move relative to the ground). In this case, the coverage range of the access network device's beam will change, that is, the beam position will change. The access network device cannot indirectly indicate the area to which the beam position belongs by indicating the beam position.

[0101] 2) An index of at least one first synchronization signal / physical broadcast channel block (SS / PBCH block or SSB). For example, the index of the at least one first SSB included in the first information may be directly {0, 1, 6, 7, 8, 9, 14}, or the index of the at least one first SSB included in the first information may be presented in the form of a bitmap, for example, {01001010} represents the second first SSB, the fifth first SSB, and the seventh first SSB, i.e., SSB#1, SSB#4, and SSB#6. Among them, at least one first SSB corresponds to at least one first region.

[0102] The SSB can refer to the SS / PBCH block. Synchronization signals can be used by terminal devices for downlink synchronization and to obtain the cell's identity (ID). Downlink synchronization can include frequency and time synchronization. PBCH can be used by terminal devices to obtain information about the cell they are connected to.

[0103] The following relationship exists between SSB and beams: Access network equipment may use multiple antennas to enhance coverage, but the use of multiple antennas will result in the antenna radiating a very narrow beam, and a single narrow beam will have difficulty covering the entire cell. At the same time, due to hardware limitations, access network equipment often cannot send signals through multiple beams simultaneously to cover the entire cell. Therefore, mobile communication systems have introduced beam scanning technology, that is, access network equipment can send signals through different beams at different times. For example, for a cell, the access network equipment can send different SSBs through different beams at different times, thereby completing the broadcast beam coverage of the cell. Each beam can be indicated by an SSB, for example, each beam can be indicated by the index of the SSB sent on the beam. The coverage range of each beam can also be indicated by the SSB, for example, the coverage range of each beam can be indicated by the index of the SSB sent on the beam.

[0104] Therefore, the first SSB corresponding to the first area can be understood as: the coverage range of the first beam is the first area, and the first beam sends the first SSB to cover the first area, that is, the coverage range of the first SSB is the first area.

[0105] For example, the access network device is configured with three beams: Beam #1, Beam #2, and Beam #3. Beam #1 transmits SSB #1 to cover Area #1, Beam #2 transmits SSB #2 to cover Area #2, and Beam #3 transmits SSB #3 to cover Area #3. Therefore, the access network device can indirectly indicate Area #1 by indicating SSB #1, indirectly indicate Area #2 by indicating SSB #2, and indirectly indicate Area #3 by indicating SSB #3.

[0106] It is understandable that when the beam weight and beam direction of the access network device are related to the location of the access network device, the beam of the access network device does not move with the access network device (i.e., it is geostationary). In this case, the coverage range of the beam of the access network device remains unchanged, and the SSB sent by the beam remains unchanged, that is, the coverage range of the SSB remains unchanged. The access network device can indirectly indicate the area covered by the beam sending the SSB by indicating the SSB.

[0107] However, when the beam weight and beam direction of the access network device are unrelated to the location of the access network device, the beam of the access network device will move with the access network device (i.e., move relative to the ground). In this case, the coverage range of any beam of the access network device will change, but the SSB transmitted by the beam will not change. In other words, the coverage range of the SSB will change. The access network device can indirectly indicate the area covered by the beam transmitting the SSB by indicating the SSB.

[0108] 3) Second information and third information. The second information is used to indicate a first corresponding relationship (also called an initial corresponding relationship), and the first corresponding relationship may be a corresponding relationship between at least one second area within the coverage of the access network device within the first time period and at least one second SSB. Optionally, the first corresponding relationship may also be a corresponding relationship between the number or geographic location (such as the coordinates or longitude and latitude of the second area) of at least one second area within the coverage of the access network device within the first time period and the index of at least one second SSB. The third information may be used to indicate at least one first area included in at least one second area. For example, the third information indicates that the second area b among the second area a, the second area b, the second area c, and the second area d is a first area.

[0109] In a possible implementation, the first corresponding relationship may be represented by a pattern or a matrix.

[0110] Exemplarily, the first correspondence includes M rows and N columns, where M is the number of second areas within the coverage of the access network device along the first direction, and N is the number of second areas within the coverage of the access network device along the second direction, and M and N are positive integers. The first direction may be the direction of movement of the access network device (or the orbital direction of the access network device); the second direction is different from the first direction, for example, the second direction is perpendicular to the first direction. The first element is any element in the first correspondence, and the first element represents the second area a in the at least one second area. The value of the first element is the index of the second SSBa in the at least one second SSB, and the second area a corresponds to the second SSBa. For example, Figure 4A shows a possible example of the first correspondence. The first correspondence includes 8 rows and 16 columns; that is, in the first time period, the coverage of the access network device includes 8*16=128 second areas, and one second area corresponds to one second SSB. The second area 0 corresponds to the second SSB0, the second area 1 corresponds to the second SSB1, and so on.

[0111] During specific implementation, to indicate the first corresponding relationship, the second information may be used to indicate at least one of the following information 1 to information 6:

[0112] Information 1: The number of second areas along the third direction in the coverage of the at least one second area. The coverage of the at least one second area can be the same as the coverage of the access network device. Therefore, Information 1 can be replaced by the number of second areas along the third direction in the coverage of the access network device. The third direction can be the same as or different from the first direction. When the third direction is the same as the first direction, Information 1 can be M. Still taking Figure 4A as an example, within the first time period, the coverage of the access network device includes 128 second areas. If the third direction is the first direction, that is, the movement direction of the access network device, then Information 1 can be 8.

[0113] Information 2: The radius, diameter, or side length of each second area in the at least one second area along the third direction. For example, if each second area in the at least one second area is circular or elliptical, Information 2 may be the radius or diameter of each second area in the at least one second area along the third direction. For another example, if each second area in the at least one second area is rectangular or square, Information 2 may be the side length of each second area in the at least one second area along the third direction.

[0114] Optionally, the shape and size of each second area in the at least one second area may be the same or different. If the shape and size of each second area in the at least one second area are the same, the second information may only indicate the radius, diameter, or side length of one second area in the at least one second area along the third direction, thereby reducing the signaling overhead of the second information. For example, the second information may indicate that the radius of each area in the at least one second area along the third direction is 40 kilometers (km). If the shape and size of each second area in the at least one second area are different, the second information may indicate the radius, diameter, or side length of each second area in the at least one second area along the third direction.

[0115] Information 3: The number of second areas along the fourth direction in the coverage of at least one second area. The coverage of the at least one second area may be the same as the coverage of the access network device. Therefore, Information 3 may be replaced by the number of second areas along the fourth direction in the coverage of the access network device. The fourth direction may be different from the third direction, for example, the third direction and the fourth direction are perpendicular to each other. The fourth direction may be the same as or different from the second direction. When the fourth direction is the same as the second direction, Information 3 may be N. Still taking Figure 4A as an example, within the first time period, the coverage of the access network device includes 128 second areas. If the fourth direction is the second direction, that is, perpendicular to the movement direction of the access network device, Information 3 may be 16.

[0116] Information 4: The radius, diameter, or side length of each second area in the at least one second area along the fourth direction. For example, if each second area in the at least one second area is circular or elliptical, Information 4 may be the radius or diameter of each second area in the at least one second area along the fourth direction. For another example, if each second area in the at least one second area is rectangular or square, Information 4 may be the side length of each second area in the at least one second area along the fourth direction.

[0117] Optionally, the shape and size of each second area in the at least one second area may be the same or different. If the shape and size of each second area in the at least one second area are the same, the second information may only indicate the radius, diameter, or side length of one second area in the at least one second area along the fourth direction, thereby reducing the signaling overhead of the second information. For example, the second information may indicate that the radius of each area in the at least one second area along the fourth direction is 30 km. If the shape and size of each second area in the at least one second area are different, the second information may indicate the radius, diameter, or side length of each second area in the at least one second area along the fourth direction.

[0118] Optionally, if the shape of the second area in the at least one second area is circular or square, the second information may indicate one of information 1 and information 3, and one of information 2 and information 4.

[0119] Information 5, the position of the reference area in the at least one second area. The reference area may be one of the at least one second area. For example, the reference area may be the central area of ​​the at least one second area. For another example, the reference area may be the starting area of ​​the at least one second area. Still taking Figure 4A as an example, the reference area may be the area corresponding to 0. For another example, the reference area may be the area corresponding to the starting second SSB in the at least one second area. The starting second SSB may be the second SSB with the largest or smallest index in the at least one second SSB. Still taking Figure 4A as an example, if the starting second SSB may be the second SSB with the smallest index in the at least one second SSB, the reference area may be the second area corresponding to the second SSB with an index of 0; if the starting second SSB may be the second SSB with the largest index in the at least one second SSB, the reference area may be the second area corresponding to the second SSB with an index of 255.

[0120] In some implementations, information 5 may indicate the geographic location of the reference area (e.g., the coordinates or longitude and latitude of the reference area), so that upon receiving information 5, the terminal device can determine the geographic location of the reference area. In other implementations, information 5 may indicate the relationship between the reference area and a reference location (e.g., the sub-satellite point of the access network device), so that the terminal device can determine the geographic location of the reference area based on information 5 and the reference location. Still using FIG4A as an example, the reference area may be the area corresponding to 0, the reference location may be the sub-satellite point of the access network device, and information 5 may indicate that the reference location is offset from the sub-satellite point of the access network device by four second areas in the opposite direction of the third direction and by eight second areas in the opposite direction of the fourth direction.

[0121] Information 6: The correspondence between at least one second area within the coverage of the access network device and at least one second SSB in the first relationship, the arrangement order of the at least one second SSB. In some examples, the arrangement order may be arranged in sequence along the fourth direction. For example, the fourth direction is perpendicular to the movement direction of the access network device (or the fourth direction is perpendicular to the track direction of the access network device), and the arrangement order may be arranged in sequence along the vertical track. In other examples, the arrangement order is arranged in sequence along the third direction. For example, the third direction is the movement direction of the access network device (or the track direction of the access network device), and the arrangement order may be arranged in sequence along the horizontal track. Still taking Figure 4A as an example, if the third direction is the movement direction of the access network device, the index of the at least one second SSB gradually increases along the third direction.

[0122] Optionally, if the index of the at least one second SSB is discontinuous, the information 6 may further include the index of the at least one second SSB. Still taking FIG. 4A as an example, the index of the at least one second SSB included in the information 6 may be {0, 1, 6, 7, 8, 9, 14, 15, …, 240, 241, 246, 247, 248, 249, 254, 255}.

[0123] In one possible implementation, the correspondence between at least one second area within the coverage of the access network device and at least one second SSB may be unchanged. That is, at different times, the correspondence between at least one second area within the coverage of the access network device and at least one second SSB is the same. That is, the correspondence between at least one second area within the coverage of the access network device and at least one second SSB is not related to the current time. It can be understood that the first correspondence and the second correspondence are the same, wherein the second correspondence is the correspondence between at least one second area and at least one second SSB in a second time period, the second time period is after the first time period, and the first time period and the second time period may be continuous or discontinuous. For the specific content of the second correspondence, please refer to the above description of the first correspondence, except that the first correspondence is replaced by the second correspondence, and the first time period is replaced by the second time period. The repeated parts will not be repeated.

[0124] For example, as shown in Figure 4B , at time 1, the satellite is located at position 1, the satellite's coverage is coverage 1, and the correspondence between the multiple areas within coverage 1 and the multiple SSBs is correspondence 1. At time 2, the satellite moves to position 2, the satellite's coverage is coverage 2, and the correspondence between the multiple areas within coverage 2 and the multiple SSBs is still correspondence 1. In this mode, as the access network device moves, the beam weight and beam direction of the access network device remain unchanged. Therefore, this mode can also be referred to as a beam-following access network device (ground movement) mode.

[0125] Alternatively, the correspondence between at least one second area within the coverage of the access network device and at least one second SSB is variable. That is, at different times, the correspondence between at least one second area within the coverage of the access network device and at least one second SSB may be different. That is, the correspondence between at least one second area within the coverage of the access network device and at least one second SSB is related to the current time. It can be understood that the first correspondence and the second correspondence are different. Optionally, within a period of time, even if the location of the access network device changes, within the coverage of the access network device, the SSB corresponding to the same area on the ground is the same.

[0126] For example, as shown in Figure 4C, at time 3, the satellite is located at position 3, the satellite's coverage area is coverage area 3, and the correspondence between multiple areas within coverage area 3 and multiple SSBs is correspondence 1. At time 4, the satellite is located at position 4, the satellite's coverage area is coverage area 4, and the correspondence between multiple areas within coverage area 4 and multiple SSBs is correspondence 2. Correspondence 1 and correspondence 2 are different. In both correspondence 1 and correspondence 2, ground area 1 corresponds to SSB 1. In this mode, as the access network device moves, the beam weight and beam direction of the access network device change, but the SSB corresponding to the same ground area remains the same. Therefore, this mode can also be called a ground area fixed (i.e., geostationary) mode.

[0127] During a specific implementation, the correspondence between at least one second area within the coverage of the access network device and at least one second SSB includes M rows and N columns. The first row in the correspondence between at least one second area within the coverage of the access network device and at least one second SSB is the row where the starting second SSB is located; the first column in the correspondence between at least one second area within the coverage of the access network device and at least one second SSB is the column where the starting second SSB is located. The starting second SSB may be the second SSB with the largest or smallest index among the at least one second SSB.

[0128] To indicate at least one first area included in at least one second area, the third information may be used to indicate that the second area included in the i-th row in the correspondence between at least one second area within the coverage of the access network device and at least one second SSB is the first area, and / or the second area included in the j-th column in the correspondence between at least one second area within the coverage of the access network device and at least one second SSB is the first area, where the value of i includes integers from 1 to M, and the value of j includes integers from 1 to N. Still taking FIG. 4A as an example, if the starting second SSB may be the second SSB with the smallest index among the at least one second SSB, the reference area may be the second area corresponding to the second SSB with an index of 0, and the third information may be used to indicate that the second areas included in the 1st and 8th rows in the correspondence between at least one second area within the coverage of the access network device and at least one second SSB are the first area. That is, the first area is: the second area corresponding to the second SSB with an index of {0, 16, 32, 48, 64, 80, 96, 112, 128, 144, 160, 176, 192, 208, 224, 240}, and the second area corresponding to the second SSB with an index of {15, 31, 47, 63, 79, 95, 111, 127, 143, 159, 175, 191, 207, 223, 239, 255}.

[0129] Optionally, the third information can also be used to indicate that the w1th second area included in the i-th row in the correspondence between at least one second area within the coverage of the access network device and at least one second SSB is the first area, and / or, the w2th second area included in the j-th column in the correspondence between at least one second area within the coverage of the access network device and at least one second SSB is the first area, the values ​​of i and w2 include integers from 1 to M, and the values ​​of j and w1 include integers from 1 to N. Still taking Figure 4A as an example, the third information can be used to indicate that the first second area and the second second area included in the first row in the correspondence between at least one second area within the coverage of the access network device and at least one second SSB are the first area. That is, the first area is: the second area corresponding to the second SSB with an index of {0,16}.

[0130] 4) Fourth information: The fourth information may be used to indicate a first distance range, where the first distance range may be a distance range between the terminal device and the access network device when the terminal device is located in at least one first area.

[0131] For example, the fourth information may indicate the maximum horizontal distance threshold d max1 , maximum vertical distance threshold d max2 , minimum horizontal distance threshold d min1 and the minimum vertical distance threshold d min2 , the horizontal distance between the terminal device and the access network device is d1, and the horizontal distance between the terminal device and the access network device is d2. min1 ≤d1≤d max1 , and d min2 ≤d2≤d max2 When the terminal device is located in at least one first area within the coverage of the access network device.

[0132] In one possible implementation, the first system message may further include fifth information (e.g., RequireOSIRemoteOnly). The fifth information may be used to indicate that the terminal device needs to request a second system message when located in at least one first area, and the second system message may include ephemeris information configured by the access network device (e.g., ephemeris information of satellites in neighboring areas). The second system message may be a traditional system information block, such as SIB1, SIB19, SIB31, or other system information; or, the second system information may also be a new system information block, such as system information block 1bis (SIB1bis). It should be understood that SIB1bis may also have other names, such as system information block 19' (SIB1').

[0133] Optionally, the fifth information may also be carried in one or more of RRC signaling, downlink control information (DCI), media access control (MAC) control element (CE) or newly added signaling, and this embodiment of the present application does not limit this.

[0134] S302: The terminal device determines, based on the first information, that the terminal device is located in at least one first area.

[0135] In an embodiment of the present application, after the terminal device receives the first system message including the first information from the access network device, the terminal device can determine that the terminal device is located in at least one first area based on the first information.

[0136] The following introduces different situations based on the different contents included in the first information.

[0137] In case 1, the first information includes at least one waveband number. The terminal device can determine that the terminal device is located in at least one first area based on the at least one waveband number and the waveband number corresponding to the terminal device. For example, the at least one first waveband number included in the first information can be {0, 1, 6, 7, 8, 9, 14}. If the waveband number corresponding to the terminal device is 7, the terminal device can determine that the terminal device is located in the first area corresponding to the first waveband numbered 7.

[0138] Case 2: The first information includes an index of at least one SSB.

[0139] The terminal device can determine that the terminal device is located in at least one first area based on the index of at least one SSB and the index of the SSB corresponding to the terminal device. Exemplarily, the index of at least one first SSB included in the first information can be {0, 1, 6, 7, 8, 9, 14}. If the index of the SSB corresponding to the terminal device is 7, the terminal device can determine that the terminal device is located in the first area corresponding to the first SSB with an index of 7.

[0140] Case three: the first information includes the second information and the third information.

[0141] If the correspondence between at least one second area within the coverage of the access network device and at least one second SSB is not related to the current time (that is, the first correspondence is the same as the second correspondence), the terminal device can determine that the terminal device is located in at least one first area based on the first correspondence and the index of the SSB corresponding to the terminal device. Alternatively, if the correspondence between at least one second area within the coverage of the access network device and at least one second SSB is related to the current time (that is, the first correspondence is different from the second correspondence), then when the current time is in the first time period, the terminal device can determine that the terminal device is located in at least one first area based on the first correspondence and the index of the SSB corresponding to the terminal device.

[0142] During the specific implementation process, the terminal device can determine the index of at least one first SSB corresponding to the at least one first area based on the correspondence between at least one second area and at least one second SSB within the coverage range of the access network device within the first time period and at least one first area included in the at least one second area, and then determine that the terminal device is located in at least one first area based on the index of at least one first SSB corresponding to the at least one first area and the index of the SSB corresponding to the terminal device.

[0143] For example, still taking Figure 4A as an example, the terminal device determines that the second area corresponding to the second SSB with an index of {0,16} is the first area, and the second SSB with an index of {0,16} is the first SSB corresponding to the first area. The index of the SSB corresponding to the terminal device is 16, then the terminal device can determine that the terminal device is located in the first area corresponding to the first SSB with an index of 16.

[0144] If the correspondence between at least one second area within the coverage of the access network device and at least one second SSB is related to the current time (that is, the first correspondence is the same as the second correspondence), then when the current time is in the second time period, the terminal device can determine the second correspondence based on the first correspondence, and determine that the terminal device is located in at least one first area based on the second correspondence and the index of the SSB corresponding to the terminal device.

[0145] During the specific implementation process, the terminal device can determine the second corresponding relationship based on the start time of the first time period, the duration of the first time period, and the first corresponding relationship. It can be understood that the start time of the first time period, the duration of the first time period, and the first corresponding relationship can be used to determine the second corresponding relationship.

[0146] Exemplarily, the first correspondence includes M rows and N columns, and the second correspondence also includes M rows and N columns. The last (or bottom) K rows in the first correspondence are the first (or top) K rows in the second correspondence; the first (or top) MK rows in the first correspondence are the last (or bottom) MK rows in the second correspondence. The value of K includes integers from 1 to M. For example, if the first correspondence is the correspondence shown in Figure 4A, M is 8, N is 16, and K is 1, then the second correspondence can be the correspondence shown in Figure 4D. That is, the last (or bottom) 1 (i.e., K=1) row in the first correspondence is the first (or top) 1 row in the second correspondence; the first (or top) 7 (i.e., K=1, MK=8-1=7) rows in the first correspondence are the last (or bottom) 7 rows in the second correspondence.

[0147] K is determined based on the number of second areas spanned by the access network device from the first time period to the second time period. It can be understood that the terminal device can determine K based on the number of second areas spanned by the access network device from the first time period to the second time period. Since the number of second areas can be determined based on the start time of the first time period, the duration of the first time period, and the first corresponding relationship, K can also be determined based on the start time of the first time period, the duration of the first time period, and the first corresponding relationship.

[0148] K may satisfy one of the following formulas (1) to (5), which may be (pre)configured, or may be defined by a standard, or may be agreed upon by the terminal device and the access network device, and the embodiments of the present application do not limit this. Thus, the terminal device may determine K according to one of the formulas (1) to (5). Formula (1): K = floor((t-t0) / Δt) mod M; Formula (2): K = (floor((t-t0) / Δt) + 1) mod M; Formula (3): K = roundup((t-t0) / Δt) mod M; Formula (4): K = (roundup((t-t0) / Δt) - 1) mod M; Formula (5): K = round((t-t0) / Δt) mod M. t is a time in the second time period, t0 is the start time of the first time period, Δt is the duration of the first time period, floor indicates rounding down, roundup indicates rounding up, round indicates rounding up, and mod indicates modulo operation.

[0149] The following example illustrates how to determine K, taking the case where K satisfies formula (1) as an example. For example, if the first correspondence is the correspondence shown in FIG4A , M is 8, Δt is 9 seconds, t0 is 0 seconds, and t is 10 seconds, then K = floor((t-t0) / Δt) mod M = floor((10-0) / 9) mod 8 = 1 mod 8 = 1. In this case, the second correspondence can be the correspondence shown in FIG4D .

[0150] In case 4, the first information includes the fourth information. The terminal device may determine that the terminal device is located in at least one first area based on the first distance range and the distance between the terminal device and the access network device.

[0151] Exemplarily, the fourth information included in the first information indicates the maximum horizontal distance threshold d max1 , maximum vertical distance threshold d max2 , minimum horizontal distance threshold d min1 and the minimum vertical distance threshold d min2 The terminal device can determine that the horizontal distance between the terminal device and the access network device is d1, and the horizontal distance between the terminal device and the access network device is d2. min1 ≤d1≤d max1 , and d min2 ≤d2≤d max2 When the terminal device is located in at least one first area within the coverage area of ​​the access network device, the terminal device can determine that the terminal device is located in at least one first area within the coverage area of ​​the access network device.

[0152] S303: The terminal device sends a random access request to the access network device. Correspondingly, the access network device receives the random access request from the terminal device.

[0153] In this embodiment of the present application, the random access request may be used to request a second system message.

[0154] S304: The access network device sends a second system message to the terminal device. Correspondingly, the terminal device receives the second system message from the access network device.

[0155] In an embodiment of the present application, after the terminal device receives the second system message from the access network device, it can update the ephemeris information of the satellites in the neighboring area based on the ephemeris information configured by the access network device included in the second system message (for example, the ephemeris information of the satellites in the neighboring area).

[0156] In a possible implementation, as shown in FIG4E , the present application may further perform the following steps before executing S304:

[0157] S304a: The access network device sends a random access response to the terminal device. Correspondingly, the terminal device receives the random access response from the access network device.

[0158] According to the above solution, the terminal device can determine whether it needs to update the ephemeris information of satellites in neighboring areas by determining whether the terminal device is located in at least one first area within the coverage area of ​​the access network device. If the terminal device is located in at least one first area within the coverage area of ​​the access network device, the terminal device can determine that the ephemeris information of satellites in the neighboring area needs to be updated. Only then will the terminal device request a second system message from the access network device to update the ephemeris information of satellites in the neighboring area. Since the terminal device only requests system messages when it needs to update the ephemeris information of satellites in the neighboring area, system message overhead is reduced.

[0159] The method provided by the embodiment of the present application is described above in conjunction with the accompanying drawings, and the device provided by the embodiment of the present application is described below in conjunction with the accompanying drawings.

[0160] Based on the same technical concept, embodiments of the present application provide a communication device that includes modules / units / means for executing the methods executed by the devices in the above method embodiments. The modules / units / means can be implemented in software or hardware, or the corresponding software implementation can be executed by hardware.

[0161] For example, refer to FIG5 , which is a schematic diagram of a communication device 500 . The device 500 includes a transceiver module 501 and a processing module 502 .

[0162] When the apparatus 500 is a terminal device or is located in a terminal device, the functions of the modules of the apparatus 500 are as follows:

[0163] The transceiver module 501 is configured to receive a first system message from an access network device, where the first system message includes first information, where the first information is used to indicate at least one first area within the coverage of the access network device;

[0164] A processing module 502 is configured to determine, based on the first information, that the terminal device is located in the at least one first area;

[0165] The transceiver module 501 is further configured to send a random access request to the access network device, where the random access request is used to request a second system message, where the second system message includes ephemeris information configured by the access network device;

[0166] The transceiver module 501 is further configured to receive the second system message from the access network device.

[0167] Alternatively, when the apparatus 500 is an access network device or is located in an access network device, the functions of the modules of the apparatus 500 are as follows:

[0168] The transceiver module 501 is configured to send a first system message to a terminal device, where the first system message includes first information, where the first information is used to indicate at least one first area within the coverage of the access network device; receive a random access request from the terminal device, where the random access request is used to request a second system message, where the second system message includes ephemeris information configured by the access network device; and send the second system message to the terminal device;

[0169] In specific implementation, the above-mentioned device 500 can have various product forms. Several possible product forms are introduced below.

[0170] Refer to Figure 6, which is a schematic diagram of a communication device 600. The communication device 600 includes a processor 610 and an interface circuit 620. The interface circuit 620 is used to receive signals from other communication devices outside the communication device and transmit them to the processor 610, or send signals from the processor 610 to other communication devices outside the communication device. The processor 610 is used to implement the method executed by any terminal device or access network device in the above method embodiments through logic circuits or execution instructions.

[0171] The processor 610 and the interface circuit 620 are coupled to each other. It is understood that the interface circuit 620 can be a transceiver or an input / output interface. Optionally, the communication device 600 may further include a memory 630 for storing instructions executed by the processor 610, or storing input data required by the processor 610 to execute instructions, or storing data generated after the processor 610 executes instructions.

[0172] When the above-mentioned communication device is a module applied to a terminal device or an access network device, the module implements the functions of the terminal device or the access network device in the above-mentioned method embodiments. The module receives information from other modules (such as a radio frequency module or an antenna) in the terminal device or the access network device, and the information is sent by the access network device or the terminal device to the terminal device or the access network device; or the module sends information to other modules (such as a radio frequency module or an antenna) in the terminal device or the access network device, and the information is sent by the terminal device or the access network device to the access network device or the terminal device.

[0173] It should be understood that the processors mentioned in the embodiments of the present application can be implemented by hardware or software. When implemented by hardware, the processor can be a logic circuit, an integrated circuit, etc. When implemented by software, the processor can be a general-purpose processor that is implemented by reading software code stored in a memory.

[0174] Exemplarily, the processor may 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, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc.

[0175] It should be understood that the memory mentioned in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (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).

[0176] It should be noted that when the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, the memory (storage module) can be integrated into the processor.

[0177] It should be noted that the memory described herein is intended to include, but not be limited to, these and any other suitable types of memory.

[0178] Based on the same technical concept, an embodiment of the present application also provides a computer-readable storage medium, which stores a computer program or instruction. When the computer program or instruction is executed by the processor, the method executed by the terminal device or access network device in the above method embodiment is implemented.

[0179] Based on the same technical concept, an embodiment of the present application also provides a computer program product, which includes a computer program or instructions. When the computer program or instructions are executed by a processor, the method executed by the terminal device or access network device in the above method embodiment is implemented.

[0180] 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.

[0181] 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.

[0182] 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.

[0183] 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.

Claims

1. A communication method, characterized in that: Executed by a terminal device or a chip applied to the terminal device, including: receiving a first system message from an access network device, where the first system message includes first information, where the first information is used to indicate at least one first area within a coverage range of the access network device; Determining, based on the first information, that the terminal device is located in the at least one first area; Sending a random access request to the access network device, where the random access request is used to request a second system message, where the second system message includes ephemeris information configured by the access network device; Receive the second system message from the access network device.

2. The method according to claim 1, wherein The first information includes one or more of the following information: a serial number of at least one first wave position, the at least one first wave position belonging to the at least one first region; an index of at least one first synchronization signal / broadcast signal block (SSB), the at least one first SSB corresponding to the at least one first region; second information and third information, the second information being used to indicate a first correspondence, the first correspondence being a correspondence between at least one second area within the coverage of the access network device within a first time period and at least one second SSB, and the third information being used to indicate the at least one first area included in the at least one second area; Fourth information, the fourth information is used to indicate a first distance range, where the first distance range is the distance range between the terminal device and the access network device when the terminal device is located in the at least one first area.

3. The method according to claim 2, wherein The first information includes a number of the at least one wave position; and determining that the terminal device is located in the at least one first area based on the first information includes: Based on the number of the at least one waveband and the number of the waveband corresponding to the terminal device, it is determined that the terminal device is located in the at least one first area.

4. The method according to claim 2, wherein The first information includes an index of the at least one SSB; Determining, based on the first information, that the terminal device is located in the at least one first area includes: Based on the index of the at least one SSB and the index of the SSB corresponding to the terminal device, it is determined that the terminal device is located in the at least one first area.

5. The method according to claim 2, wherein The first information includes the second information and the third information, and the correspondence between the at least one second area within the coverage of the access network device and the at least one second SSB is not related to the current time; Determining, based on the first information, that the terminal device is located in the at least one first area includes: Based on the first corresponding relationship and the index of the SSB corresponding to the terminal device, it is determined that the terminal device is located in the at least one first area.

6. The method according to claim 2, wherein The first information includes the second information and the third information, and the correspondence between at least one second area within the coverage of the access network device and at least one second SSB is related to the current time; Determining, based on the first information, that the terminal device is located in the at least one first area includes: When the current time is in the first time period, determining that the terminal device is located in the at least one first area based on the first corresponding relationship and the index of the SSB corresponding to the terminal device; or, When the current time is in the second time period, based on the first correspondence, a second correspondence is determined, and based on the second correspondence and the index of the SSB corresponding to the terminal device, it is determined that the terminal device is located in the at least one first area, and the second correspondence is the correspondence between the at least one second area and the at least one second SSB in the second time period, and the second time period is after the first time period.

7. The method according to claim 6, wherein Determining a second corresponding relationship based on the first corresponding relationship includes: The second corresponding relationship is determined based on the start time of the first time period, the duration of the first time period, and the first corresponding relationship.

8. The method according to claim 2, wherein The first information includes the fourth information; and determining, based on the first information, that the terminal device is located in the at least one first area includes: Based on the first distance range and the distance between the terminal device and the access network device, it is determined that the terminal device is located in the at least one first area.

9. The method according to any one of claims 1 to 8, wherein: The first system message further includes fifth information, where the fifth information is used to indicate that the terminal device needs to request the second system message when located in the at least one first area.

10. A communication method, characterized in that: Executed by an access network device or a chip applied to the access network device, including: Sending a first system message to a terminal device, where the first system message includes first information, where the first information is used to indicate at least one first area within the coverage of the access network device; receiving a random access request from the terminal device, where the random access request is used to request a second system message, where the second system message includes ephemeris information configured by the access network device; Send the second system message to the terminal device.

11. The method according to claim 10, wherein The first information includes one or more of the following information: a serial number of at least one first wave position, the at least one first wave position belonging to the at least one first region; an index of at least one first synchronization signal / broadcast signal block (SSB), the at least one first SSB corresponding to the at least one first region; second information and third information, the second information being used to indicate a first correspondence, the first correspondence being a correspondence between at least one second area within the coverage of the access network device within a first time period and at least one second SSB, and the third information being used to indicate the at least one first area included in the at least one second area; Fourth information, the fourth information is used to indicate a first distance range, where the first distance range is the distance range between the terminal device and the access network device when the terminal device is located in the at least one first area.

12. The method according to claim 10 or 11, wherein: The first system message further includes fifth information, where the fifth information is used to indicate that the terminal device needs to request the second system message when located in the at least one first area.

13. A communication device, characterized in that: Comprising modules for performing the method of any one of claims 1 to 9 or claims 10 to 12.

14. A communication device, characterized in that: The method comprises a processor and an interface circuit, wherein the interface circuit is used to receive signals from other communication devices outside the communication device and transmit them to the processor or send signals from the processor to other communication devices outside the communication device, and the processor implements the method according to any one of claims 1 to 9 or claims 10 to 12 through a logic circuit or executing code instructions.

15. A communication device, characterized in that: include: memory for storing computer programs; A processor, configured to call and execute the computer program from the memory to implement the method according to any one of claims 1 to 9 or claims 10 to 12.

16. A chip system, characterized in that: include: memory for storing computer programs; A processor, configured to call and run the computer program from the memory, so that a device equipped with the chip system executes the method according to any one of claims 1 to 9 or claims 10 to 12.

17. A computer program product, characterized in that The device comprises a computer program, which, when executed by a communication device, implements the method according to any one of claims 1 to 12.

18. A computer-readable storage medium, characterized in that The storage medium stores a computer program or instruction. When the computer program or instruction is executed by the communication device, the method according to any one of claims 1 to 12 is implemented.

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