Communication method and device

Abstract

The embodiment of the invention discloses a communication method and device, and the method comprises the steps: receiving first ephemeris information of a service satellite sent by network equipment, the first ephemeris information comprises first indication information, and the first indication information is used for indicating a threshold value of a coverage edge wave position of the service satellite; and based on the first ephemeris information, determining whether to start to acquire other system information OSI broadcasted by the network device at the coverage edge beam position, the OSI being related to mobility management. By adopting the embodiment of the invention, the network equipment only broadcasts the OSI related to mobility management at the coverage edge beam position of the service satellite, so that the broadcast resource overhead is reduced, the OSI acquisition process is started after the coverage edge is determined, and the network equipment does not need to page the terminal to receive the OSI, so that the paging overhead is reduced.

Description

Technical Field

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

[0002] Non-terrestrial network (NTN) refers to a network that uses radio frequency resources on satellites, unmanned aircraft system (UAS) platforms, and high altitude platform stations (HAPS). Compared with the fifth-generation mobile communication technology (5G) of ground cellular networks, NTN networks have the characteristics of wide coverage, low latency, broadband, and low cost. As a supplement and extension of the ground network, the NTN network can achieve wide-area seamless coverage that neither the wired telephone network nor the ground mobile communication network can achieve, effectively solving the problem of Internet access in areas with insufficient communication infrastructure. A large number of satellites are deployed in low-Earth orbit, and the round-trip transmission delay of data between satellites and ground terminals is greatly reduced to a low latency of tens of milliseconds. The use of technologies such as high-frequency bands, multi-spot beams, and frequency reuse has significantly improved the communication capabilities of satellites, reduced the unit broadband cost, and can meet the needs of high information rate services. Compared with communication infrastructure such as ground 5G base stations and submarine optical fiber cables, NTN has significant cost advantages. Modern small satellites have low R&D and manufacturing costs, and software-defined technologies can further extend the service life of satellites in orbit. NTN networks can be used in scenarios such as global coverage (such as remote areas, ocean-going ships, etc.), emergency relief (such as disaster monitoring, emergency communications), the Internet of Everything, and high-speed mobility (such as high-speed rail and airplanes).

[0003] The system information broadcasting method of new radio (NR) is similar to that of long term evolution (LTE). The sending period of the master information block (MIB) is 80ms, and the sending period of the system information block 1 (SIB1) is variable, and the longest will not exceed 160ms. Other SIBs are combined to form an other system information (OSI) for broadcast. However, in the single-satellite single-cell scenario, there are many wavelets within the satellite coverage area, and OSI is broadcast on all wavelets within the satellite coverage area, resulting in large resource overhead. Summary of the invention

[0004] The embodiments of the present application provide a communication method and apparatus, which can reduce broadcast resource overhead and paging overhead.

[0005] In a first aspect, an embodiment of the present application provides a power line communication method, which is applied to a terminal device, or a chip or circuit configured in the terminal device, including:

[0006] Receive first ephemeris information of a service satellite sent by a network device, where the first ephemeris information includes first indication information, and the first indication information is used to indicate a threshold value of a coverage edge wave position of the service satellite; based on the first ephemeris information, determine whether to start obtaining other system information OSI broadcast by the network device at the coverage edge wave position, where the OSI is related to mobility management.

[0007] The network device only broadcasts OSI related to mobility management at the coverage edge wave position of the service satellite, thereby reducing broadcast resource overhead and not affecting the terminal device's execution of cell reselection / conditional switching. The terminal device determines whether it is at the coverage edge wave position according to the threshold value of the coverage edge wave position of the service satellite indicated by the first indication information. If the terminal device is at the coverage edge wave position, the OSI acquisition process is started, and the network device does not need to page the terminal to receive OSI, thereby reducing paging overhead. If the terminal device is not at the coverage edge wave position, the OSI acquisition process is not started, thereby reducing the power consumption of the terminal device.

[0008] In a possible design, the first ephemeris information also includes the ephemeris of the service satellite, and the horizontal distance component and the vertical distance component between the terminal device and the reference position of the service satellite are determined based on the terminal device's own position information and the ephemeris of the service satellite; and whether to start acquiring the OSI broadcast by the network device at the coverage edge wave position is determined based on the horizontal distance component, the vertical distance component and the first indication information. In a scenario where the ground coverage area of ​​the service satellite is rectangular, by determining the horizontal distance component and the vertical distance component between the terminal device and the reference position of the service satellite, it is determined whether the terminal device is at the coverage edge wave position, thereby improving the accuracy of determining whether to start the OSI process.

[0009] In a possible design, the first indication information includes a horizontal distance threshold value and a vertical distance threshold value; when the horizontal distance component is greater than or equal to the horizontal distance threshold value, or the vertical distance threshold value is greater than or equal to the vertical distance threshold value, it is determined that the terminal device is in the coverage edge wave position of the service satellite, and the acquisition of the OSI broadcast by the network device in the coverage edge wave position is started; when the horizontal distance component is less than the horizontal distance threshold value, and the vertical distance threshold value is less than the vertical distance threshold value, it is determined that the terminal device is not in the coverage edge wave position of the service satellite, and the acquisition of the OSI broadcast by the network device in the coverage edge wave position is not started. Since the OSI acquisition process is started only when the terminal device is in the coverage edge wave position, the network device does not need to page the terminal device to receive the OSI, thereby reducing the paging overhead.

[0010] In one possible design, the reference position of the service satellite is the sub-satellite point of the service satellite, or the center point of the ground coverage area of ​​the service satellite.

[0011] In a possible design, the first ephemeris information also includes the ephemeris of the service satellite, and the first distance between the terminal device and the service satellite is determined based on the terminal device's own position information and the ephemeris of the service satellite; and whether to start acquiring the OSI broadcast by the network device at the coverage edge wave position is determined based on the first distance and the first indication information. In a scenario where the ground coverage area of ​​the service satellite is circular, by determining the first distance between the terminal device and the service satellite, it is determined whether the terminal device is at the coverage edge wave position, thereby improving the accuracy of determining whether to start the OSI process.

[0012] In a possible design, the first indication information includes a first distance threshold value; when the first distance is greater than or equal to the first distance threshold value, it is determined that the terminal device is in the coverage edge wave position of the service satellite, and the acquisition of the OSI broadcast by the network device in the coverage edge wave position is started; when the first distance is less than the first distance threshold value, it is determined that the terminal device is not in the coverage edge wave position of the service satellite, and the acquisition of the OSI broadcast by the network device in the coverage edge wave position is not started. Since the OSI acquisition process is started only when the terminal device is in the coverage edge wave position, the network device does not need to page the terminal device to receive the OSI, thereby reducing the paging overhead.

[0013] In a possible design, the first ephemeris information also includes the ephemeris of the service satellite, and the first angle between the line connecting the terminal device to the service satellite and the tangent of the earth's surface is determined based on the position information of the terminal device and the ephemeris of the service satellite; and whether to start acquiring the OSI broadcast by the network device at the coverage edge wave position is determined based on the first angle and the first indication information. In a scenario where the ground coverage area of ​​the service satellite is circular, whether the terminal device is at the coverage edge wave position is determined by the first angle between the line connecting the terminal device to the service satellite and the tangent of the earth's surface, thereby improving the accuracy of determining whether to start the OSI process.

[0014] In a possible design, the first indication information includes an elevation angle threshold value; when the first angle is less than or equal to the elevation angle threshold value, it is determined that the terminal device is in the coverage edge wave position of the service satellite, and the acquisition of the OSI broadcast by the network device in the coverage edge wave position is started; when the first angle is greater than the elevation angle threshold value, it is determined that the terminal device is not in the coverage edge wave position of the service satellite, and the acquisition of the OSI broadcast by the network device in the coverage edge wave position is not started. Since the OSI acquisition process is started only when the terminal device is in the coverage edge wave position, the network device does not need to page the terminal device to receive the OSI, thereby reducing the paging overhead.

[0015] In a possible design, the first ephemeris information also includes the ephemeris and coverage information of the service satellite. The ground coverage area of ​​the service satellite is determined based on the ephemeris and coverage information of the service satellite; the minimum distance between the terminal device and the edge of the ground coverage area is determined based on its own position information and the ground coverage area; and whether to start acquiring other system information OSI broadcast by the network device at the coverage edge wave position is determined based on the minimum distance and the first indication information. In the scenario where the ground coverage area of ​​the service satellite is non-circular, by determining the minimum distance between the terminal device and the edge of the ground coverage area, it is determined whether the terminal device is at the coverage edge wave position, thereby improving the accuracy of determining whether to start the OSI process.

[0016] In a possible design, the first indication information includes a second distance threshold value; when the minimum distance is less than or equal to the second distance threshold value, it is determined that the terminal device is in the coverage edge wave position of the service satellite, and the acquisition of the OSI broadcast by the network device in the coverage edge wave position is started; when the minimum distance is greater than the second distance threshold value, it is determined that the terminal device is not in the coverage edge wave position of the service satellite, and the acquisition of the OSI broadcast by the network device in the coverage edge wave position is not started. Since the OSI acquisition process is started only when the terminal device is in the coverage edge wave position, the network device does not need to page the terminal device to receive the OSI, thereby reducing the paging overhead.

[0017] In one possible design, the coverage range information includes at least one of the following information: a maximum scanning angle, a coverage radius, a maximum horizontal scanning angle, a maximum vertical scanning angle, a horizontal coverage width, or a vertical coverage width.

[0018] In a possible design, a cell reselection parameter and / or second ephemeris information of a neighboring satellite is obtained from the OSI; and a cell reselection or cell switching is performed according to the cell reselection parameter and / or the second ephemeris information, so as to reselect or switch to a cell of a neighboring satellite and ensure the communication quality between the terminal device and the satellite.

[0019] In a second aspect, an embodiment of the present application provides a power line communication method, which is applied to a network device, or a chip or circuit configured in the network device, including:

[0020] Sending first ephemeris information of a serving satellite, the first ephemeris information including first indication information, the first indication information being used to indicate a threshold value of a coverage edge wave position of the serving satellite; broadcasting other system information OSI at the coverage edge wave position, the OSI being related to mobility management. The network device only broadcasts OSI related to mobility management at the coverage edge wave position of the serving satellite, thereby reducing broadcast resource overhead and not affecting the terminal device from performing cell reselection / conditional switching.

[0021] In one possible design, the first ephemeris information also includes at least one of the following information: the ephemeris of the service satellite, or the coverage information of the service satellite.

[0022] In one possible design, the first indication information includes at least one of the following information:

[0023] The horizontal distance threshold and vertical distance threshold of the reference position of the terminal device and the service satellite, the elevation angle threshold of the line between the terminal device and the service satellite and the tangent of the earth's surface, the first distance threshold between the terminal device and the service satellite, and the second distance threshold between the terminal device and the edge of the ground coverage area of ​​the service satellite.

[0024] In one possible design, the reference position of the service satellite is the sub-satellite point of the service satellite, or the center point of the ground coverage area of ​​the service satellite.

[0025] In a third aspect, an embodiment of the present application provides a communication device, including:

[0026] A receiving module, configured to receive first ephemeris information of a service satellite sent by a network device, wherein the first ephemeris information includes first indication information, and the first indication information is used to indicate a threshold value of a coverage edge wave position of the service satellite;

[0027] The processing module is used to determine whether to start obtaining other system information OSI broadcast by the network device at the coverage edge wave position based on the first ephemeris information, where the OSI is related to mobility management.

[0028] In one possible design, the first ephemeris information also includes the ephemeris of the service satellite, and the processing module is further used to determine the horizontal distance component and the vertical distance component between the terminal device and the reference position of the service satellite based on its own position information and the ephemeris of the service satellite; and determine whether to start acquiring the OSI broadcast by the network device at the coverage edge wave position based on the horizontal distance component, the vertical distance component and the first indication information.

[0029] In one possible design, the first indication information includes a horizontal distance threshold value and a vertical distance threshold value;

[0030] The processing module is further used for determining that the terminal device is at the coverage edge wave position of the service satellite when the horizontal distance component is greater than or equal to the horizontal distance threshold value, or the vertical distance threshold value is greater than or equal to the vertical distance threshold value, and starting to obtain the OSI broadcast by the network device at the coverage edge wave position; when the horizontal distance component is less than the horizontal distance threshold value, and the vertical distance threshold value is less than the vertical distance threshold value, determining that the terminal device is not at the coverage edge wave position of the service satellite, and not starting to obtain the OSI broadcast by the network device at the coverage edge wave position.

[0031] In one possible design, the reference position of the service satellite is the sub-satellite point of the service satellite, or the center point of the ground coverage area of ​​the service satellite.

[0032] In one possible design, the first ephemeris information further includes the ephemeris of the serving satellite.

[0033] The processing module is also used to determine a first distance between the terminal device and the service satellite based on its own position information and the ephemeris of the service satellite; and determine whether to start obtaining the OSI broadcast by the network device at the coverage edge wave position based on the first distance and the first indication information.

[0034] In one possible design, the first indication information includes a first distance threshold value;

[0035] The processing module is further used to determine that the terminal device is at the coverage edge wave position of the service satellite when the first distance is greater than or equal to the first distance threshold value, and start obtaining the OSI broadcast by the network device at the coverage edge wave position; when the first distance is less than the first distance threshold value, determine that the terminal device is not at the coverage edge wave position of the service satellite, and do not start obtaining the OSI broadcast by the network device at the coverage edge wave position.

[0036] In one possible design, the first ephemeris information further includes the ephemeris of the serving satellite.

[0037] The processing module is also used to determine a first angle between a line from a terminal device to the service satellite and a tangent to the earth's surface based on its own position information and the ephemeris of the service satellite; and determine whether to start acquiring the OSI broadcast by the network device at the coverage edge wave position based on the first angle and the first indication information.

[0038] In one possible design, the first indication information includes an elevation angle threshold value;

[0039] The processing module is also used to determine that the terminal device is at the coverage edge wave position of the service satellite when the first angle is less than or equal to the elevation angle threshold value, and start obtaining the OSI broadcast by the network device at the coverage edge wave position; when the first angle is greater than the elevation angle threshold value, determine that the terminal device is not at the coverage edge wave position of the service satellite, and do not start obtaining the OSI broadcast by the network device at the coverage edge wave position.

[0040] In one possible design, the first ephemeris information further includes ephemeris and coverage information of the serving satellite.

[0041] The processing module is also used to determine the ground coverage area of ​​the service satellite based on the ephemeris of the service satellite and the coverage range information; determine the minimum distance between the terminal device and the edge of the ground coverage area based on its own position information and the ground coverage area; and determine whether to start obtaining other system information OSI broadcast by the network device at the coverage edge wave position based on the minimum distance and the first indication information.

[0042] In one possible design, the first indication information includes a second distance threshold value;

[0043] The processing module is further used to determine that the terminal device is at the coverage edge wave position of the service satellite when the minimum distance is less than or equal to the second distance threshold value, and start obtaining the OSI broadcast by the network device at the coverage edge wave position; when the minimum distance is greater than the second distance threshold value, determine that the terminal device is not at the coverage edge wave position of the service satellite, and do not start obtaining the OSI broadcast by the network device at the coverage edge wave position.

[0044] In one possible design, the coverage range information includes at least one of the following information: a maximum scanning angle, a coverage radius, a maximum horizontal scanning angle, a maximum vertical scanning angle, a horizontal coverage width, or a vertical coverage width.

[0045] In one possible design, the processing module is also used to obtain cell reselection parameters and / or second ephemeris information of a neighboring satellite from the OSI; and perform cell reselection or cell switching according to the cell reselection parameters and / or the second ephemeris information.

[0046] The operations and beneficial effects performed by the communication device can refer to the method and beneficial effects described in the first aspect above, and the repeated parts will not be repeated.

[0047] In a fourth aspect, an embodiment of the present application provides a communication device, including:

[0048] A sending module, used for sending first ephemeris information of a service satellite, where the first ephemeris information includes first indication information, where the first indication information is used for indicating a threshold value of a coverage edge wave position of the service satellite;

[0049] The sending module is further used to broadcast other system information OSI at the coverage edge wave position, where the OSI is related to mobility management.

[0050] In one possible design, the first ephemeris information also includes at least one of the following information: the ephemeris of the service satellite, or the coverage information of the service satellite.

[0051] In one possible design, the first indication information includes at least one of the following information: a horizontal distance threshold value and a vertical distance threshold value between the terminal device and a reference position of the service satellite, an elevation angle threshold value between a line between the terminal device and the service satellite and a tangent line to the earth's surface, a first distance threshold value between the terminal device and the service satellite, and a second distance threshold value between the terminal device and an edge of a ground coverage area of ​​the service satellite.

[0052] In one possible design, the reference position of the service satellite is the sub-satellite point of the service satellite, or the center point of the ground coverage area of ​​the service satellite.

[0053] The operations and beneficial effects performed by the communication device can refer to the method and beneficial effects described in the second aspect above, and the repeated parts will not be repeated.

[0054] In a fifth aspect, the present application provides a communication device, comprising a processor and a memory, wherein the memory is used to store a computer program; the processor is used to execute the computer program stored in the memory so that the communication device performs a method as described in any one of the first aspects.

[0055] In a sixth aspect, the present application provides a communication device, comprising a processor and a memory, wherein the memory is used to store a computer program; the processor is used to execute the computer program stored in the memory so that the communication device performs a method as described in any one of the second aspects.

[0056] In the seventh aspect, the present application provides a communication device, which may be a terminal device, or a device in a terminal device, or a device that can be used in combination with a terminal device. Among them, the communication device may also be a chip system. The communication device may execute the method described in the first aspect. The functions of the communication device may be implemented by hardware, or by hardware executing corresponding software implementations. The hardware or software includes one or more modules corresponding to the above functions. The module may be software and / or hardware. The operations and beneficial effects performed by the communication device may refer to the methods and beneficial effects described in the first aspect above, and the repetitive parts will not be repeated.

[0057] In an eighth aspect, the present application provides a communication device, which may be a network device, or a device in a network device, or a device that can be used in combination with a network device. Among them, the communication device may also be a chip system. The communication device may execute the method described in the second aspect. The functions of the communication device may be implemented by hardware, or by hardware executing corresponding software implementations. The hardware or software includes one or more modules corresponding to the above functions. The module may be software and / or hardware. The operations and beneficial effects performed by the communication device may refer to the methods and beneficial effects described in the second aspect above, and the repetitive parts will not be repeated.

[0058] In a ninth aspect, the present application provides a computer-readable storage medium for storing a computer program. When the computer program is executed, the method described in any one of the first aspect and the second aspect is implemented.

[0059] In a tenth aspect, the present application provides a computer program product comprising a computer program, which, when executed, enables the method described in any one of the first and second aspects to be implemented.

[0060] In the eleventh aspect, an embodiment of the present application provides a communication system, which includes at least one terminal device and at least one network device, the terminal device is used to execute the steps in the above-mentioned first aspect, and the network device is used to execute the steps in the above-mentioned second aspect.

[0061] In a twelfth aspect, a chip is provided, the chip comprising a processor and a communication interface, the communication interface being used to communicate with an external device or an internal device, and the processor being used to implement the methods in the above aspects.

[0062] In one possible design, the chip may further include a memory, in which a computer program or instruction is stored, and the processor is used to execute the computer program or instruction stored in the memory, or other programs or instructions. When the computer program or instruction is executed, the processor is used to implement the above-mentioned various aspects of the method.

[0063] In one possible design, the chip can be integrated into a terminal device or a network device. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 is a schematic diagram of the architecture of a communication system 100 provided in an embodiment of the present application;

[0065] Figure 2A It is a schematic diagram of an NTN scenario based on transparent payload;

[0066] Figure 2B It is a schematic diagram of a NTN scenario based on regenerative payload;

[0067] Figure 3 It is a schematic diagram of satellite coverage;

[0068] Figure 4 It is a flow chart of a communication method provided in an embodiment of the present application;

[0069] Figure 5A It is a schematic diagram of a rectangular coverage scene;

[0070] Figure 5B This is a schematic diagram of another rectangular coverage scenario;

[0071] Fig. 6A It is a schematic diagram of a circular coverage scenario;

[0072] Figure 6B is a schematic diagram of another circular coverage scenario;

[0073] Figure 7 It is a schematic diagram of a non-circular coverage scenario;

[0074] Figure 8 is a structural diagram of a communication device provided in an embodiment of the present application;

[0075] Fig. 9 is a structural diagram of a communication device provided in an embodiment of the present application;

[0076] Fig.10 It is a structural diagram of a terminal device provided in an embodiment of the present application;

[0077] Fig.11 It is a structural diagram of a network device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0078] like Figure 1 As shown, Figure 1 1 is a schematic diagram of the architecture of a communication system 100 provided in an embodiment of the present application. The communication system 100 may include at least one network device (110a, 110b, 110c) and may also include at least one terminal device (120a-120g). The network device and the terminal device may be connected to each other by wire or wirelessly. Figure 1 This is just a schematic diagram. The communication system may also include other network devices, such as wireless relay equipment and wireless backhaul equipment.

[0079] The network device provided in the embodiment of the present application may be an access network device, such as a base station, a Node B, an evolved Node B (eNodeB or eNB), a transmission reception point (TRP), a next generation Node B (gNB) in a fifth generation (5G) mobile communication system, an access network device in an open radio access network (O-RAN or open RAN), a next generation base station in a sixth generation (6G) mobile communication system, or a base station in a future mobile communication system, or an access node in a wireless fidelity (WiFi) system, etc. Alternatively, the network device may be a module or unit that performs part of the functions of a base station, for example, a centralized unit (CU), a distributed unit (DU), a centralized unit control plane (CU control plane, CU-CP) module, or a centralized unit user plane (CU user plane, CU-UP) module, etc. The network device may be a satellite (such as Figure 1 Satellite base stations in the , or macro base stations (such as Figure 1 110b), the access network device may also be a micro base station or an indoor station (such as Figure 1 110c), may also be a relay node or a donor node, etc. The present application does not limit the specific technology and specific device form used by the access network device.

[0080] The terminal device provided in the embodiment of the present application may also be referred to as a terminal, including but not limited to: user equipment (UE), mobile station, or mobile terminal. The terminal device can be widely used in various scenarios for communication. The scenario includes, for example, but is not limited to at least one of the following scenarios: enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), massive machine-type communications (mMTC), device-to-device (D2D), vehicle to everything (V2X), machine-type communication (MTC), Internet of Things (IOT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wearable, smart transportation, or smart city. The terminal device can be a mobile phone (such as Figure 1 Mobile phones 120a, 120d, 120f), tablet computers, computers with wireless transceiver functions (such as Figure 1 Computers 120g in the market), wearable devices, vehicles (such as Figure 1 120b), drones, helicopters, airplanes (such as Figure 1 120c in ), ships, robots, robotic arms, or smart home devices (such as Figure 1 The present application does not limit the specific technology and specific device form adopted by the terminal device.

[0081] The base station and / or terminal device can be fixed or movable. The base station and / or terminal device can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; or can be deployed on the water surface; or can be deployed on aircraft, balloons and artificial satellites in the air. This application does not limit the environment / scenario in which the base station and terminal device are located. The base station and the terminal device can be deployed in the same or different environments / scenarios, for example, the base station and the terminal device are deployed on land at the same time; or, the base station is deployed on land and the terminal device is deployed on the water surface, etc., and examples are not given one by one.

[0082] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: long term evolution (LTE) system, 5G system or new radio (NR), non-terrestrial networks (NTN) and future communication systems, such as the sixth generation mobile communication system, etc. The present application is not limited to this.

[0083] NR system messages can be divided into three types: master information block (MIB), system information block 1 (SIB1), and other system information (OSI).

[0084] Among them, MIB is the system information that UE needs to obtain immediately after completing cell search and frequency / time synchronization. MIB is broadcast through the broadcast channel (BCH), and BCH and synchronization channel (primary synchronization signal (PSS) / secondary synchronization signal (SSS)) are combined together and collectively referred to as SS Block (SSB). MIB is system information that must be broadcast by the cell.

[0085] After obtaining the MIB, the UE must obtain the next system message SIB1. The information contained in SIB1 does not need to be repeated with the information contained in the MIB. SIB1 is broadcast on the physical downlink shared channel (PDSCH) and mainly includes the following types of information: (1) Cell selection parameters: necessary information for the UE to determine whether the signal of this cell meets the cell residence conditions; (2) Access control parameters: necessary information for the UE to determine whether a certain type of access service is allowed to be initiated; (3) Channel configuration information related to initial access: channel configuration information required for the random access process; (4) System message request configuration information; (5) Scheduling information for other system messages; (6) Some other information, such as whether Voice over Internet Protocol (VoIP) services are supported.

[0086] OSI includes SIB2 to SIB21, where OSI related to mobility management includes: (1) SIB2: common parameters for cell reselection;

[0087] (2) SIB3: Neighbor cell parameters for intra-frequency cell reselection; (3) SIB4: Neighbor cell parameters for inter-frequency cell reselection; (4) SIB5: Neighbor cell parameters for inter-radio access technology (RAT) cell reselection; (5) SIB19: Ephemeris information, including local star ephemeris and neighboring star ephemeris.

[0088] UE obtains MIB, SIB1 and OSI in chronological order. MIB is broadcast together with SSB. After UE obtains SSB through blind detection, it can obtain MIB. MIB contains the search space parameter configuration of the physical downlink control channel (PDCCH) of SIB1. After obtaining MIB, UE obtains SIB1 by detecting PDCCH according to the search space parameter configuration of PDCCH of SIB1. SIB1 contains the scheduling information of OSI. Finally, UE obtains the scheduling information of OSI from SIB1 and receives OSI according to the scheduling information.

[0089] If the content of the system message is updated, the network device needs to notify the UE to update the system message. The system message update mechanism of NR is carried out through paging. UEs in the radio resource control (RRC) idle state and RRC inactive state always listen to their own paging opportunities. UEs in the RRC connected state will listen to all paging opportunities. If the network device needs to update system information related to public safety, the paging notification will also include a public warning system (PWS) tag. This tag will allow the UE to immediately perform the system information acquisition process when it receives the system message update notification. Other system information is generally obtained in the next system message update period in order to maintain time synchronization with the network equipment. The system message update period is generally an integer multiple of the discontinuous reception (DRX) period.

[0090] Typical scenarios for NTN networks to provide user equipment access include transparent payload NTN scenarios and regenerative payload NTN scenarios, such as Figure 2A As shown, Figure 2AThis is a schematic diagram of an NTN scenario based on transparent payload. Transparent payload is a payload that changes the frequency carrier of the uplink radio frequency (RF) signal and performs filtering and amplification before downlink transmission. This payload only has a radio frequency processing unit and no baseband demodulation, decoding and other processing. Therefore, the signal waveform is unchanged and is repeated. Figure 2B As shown, Figure 2B It is a schematic diagram of an NTN scenario based on regenerative payload.

[0091] A regenerative payload is a payload that transforms and amplifies the uplink RF signal before downlink transmission. Signal transformation refers to digital processing, which can include demodulation, decoding, re-encoding, re-modulation and / or filtering. In practice, it is equivalent to having all or part of the base station functions (such as gNB) on the satellite (or UAS platform).

[0092] Among them, the NTN network usually has the following elements: 1. There are one or more gateways connecting the NTN network and the public data network. 2. Feeder link: a wireless link between the gateway and the satellite (or UAS platform). 3. Service link: a wireless link between the user equipment and the satellite (or UAS platform). 4. Satellite (or UAS platform) to implement transparent payload and regenerative payload. 5. Whether the satellite constellation has an inter-satellite link (ISL) is optional. The inter-satellite link requires that the satellite is a regenerative payload, that is, if there is an inter-satellite link, the satellite must be a regenerative payload. ISL can operate in RF frequency or optical band. 6. The UE is served by the satellite (or UAS platform) within the target service area.

[0093] like Figure 3 As shown, Figure 3 This is a schematic diagram of satellite coverage. One of the most notable features of satellite communications is the large coverage area. Referring to the system parameters in TR 38.821, assuming that the satellite's orbital altitude is 600km and the scanning angle is 52.3° (the elevation angle of the terminal device is 30° at this time), the coverage radius is about 850km and the coverage area is about 227w square kilometers. The coverage radius of a single satellite beam is 25km (S-band, sub-satellite point), and the coverage area is about 2k square kilometers. A maximum of 1135 beams are required to achieve full coverage.

[0094] NR's system information broadcasting method is similar to LTE. The sending period of MIB is 80ms, and the sending period of SIB1 is variable, and the longest will not exceed 160ms. Other SIBs are combined to form an OSI for broadcast. OSI is broadcast in a window of fixed length according to a certain period in the time domain, and does not overlap with each other. A specific UE identifier, namely the system information radio network temporary identity (SI-RNTI), is convolved on the PDCCH that schedules SIB1 and OSI. However, in a single-satellite single-cell scenario, the number of wavelets within the satellite coverage is large (up to 1135), and OSI is broadcast on all wavelets within the satellite coverage, resulting in a large resource overhead.

[0095] In order to solve the above technical problems, the embodiments of the present application provide the following solutions.

[0096] like Figure 4 As shown, Figure 4 1 is a flow chart of a communication method provided in an embodiment of the present application. The method mainly comprises the following steps:

[0097] S401, a network device sends first ephemeris information of a service satellite, where the first ephemeris information includes first indication information, and the first indication information is used to indicate a threshold value of a coverage edge wave position of the service satellite.

[0098] Specifically, the network device may broadcast the first ephemeris information of the service satellite in all wave positions within the ground coverage area of ​​the service satellite, and the terminal device may receive the first ephemeris information after selecting, reselecting or switching to the cell of the network device. Among them, the first ephemeris information may be included in SIB19, and the first ephemeris information may also include the ephemeris of the service satellite, and the ephemeris of the service satellite may be used to determine the position of the service satellite, and the ephemeris may be an orbital parameter ephemeris or a position and velocity state vector ephemeris. The orbital parameter ephemeris includes parameters such as the semi-major axis, eccentricity, argument of periapsis, longitude of ascending node, inclination, and mean anomaly of the reference time (epoch time). The velocity state vector ephemeris includes a 3D position vector and a 3D velocity vector of the satellite at the reference time. Optionally, the first ephemeris information may also include coverage information of the service satellite, or a timing advance adjustment amount, etc. The coverage range information includes at least one of the following information: a maximum scanning angle, a coverage radius, a maximum horizontal scanning angle, a maximum vertical scanning angle, a horizontal coverage width, or a vertical coverage width.

[0099] The shape of the ground coverage area of ​​the service satellite may be circular, rectangular or other irregular shapes. Accordingly, the shape of the coverage edge wave position may be circular, rectangular or other irregular shapes.

[0100] Optionally, the network device can broadcast MIB and SIB1 in all wave positions within the ground coverage area of ​​the service satellite. After selecting, reselecting, or switching to the cell of the network device, the terminal device can receive MIB and SIB1. Among them, MIB is broadcast together with SSB. The terminal device can obtain MIB after obtaining SSB through blind detection. Then obtain the search space parameter configuration of PDCCH of SIB1 from MIB, and obtain SIB1 by detecting PDCCH according to the search space parameter configuration of PDCCH of SIB1. Finally, obtain the scheduling information of OSI from SIB1 so that OSI can be received through scheduling information later.

[0101] S402: The network device broadcasts other system information OSI at the coverage edge wave position, where the OSI is related to mobility management.

[0102] It should be noted that the network device does not need to broadcast OSI in all wavelengths within the ground coverage area of ​​the service satellite, but only broadcasts OSI in wavelengths at the coverage edge of the service satellite, thereby reducing the overhead of broadcast resources.

[0103] S403: The terminal device determines whether to start acquiring other system information OSI broadcast by the network device at the coverage edge wavelength based on the first ephemeris information.

[0104] In one implementation, in a scenario where the ground coverage area of ​​the service satellite is rectangular, the first indication information includes a horizontal distance threshold value and a vertical distance threshold value. The horizontal distance threshold value is the minimum horizontal distance between the reference position of the service satellite and the coverage edge wave position of the broadcast OSI, and the vertical distance threshold is the minimum vertical distance between the reference position of the service satellite and the edge wave position of the broadcast OSI. The reference position of the service satellite is the sub-satellite point of the service satellite (earth-moving scenario) or the center point of the ground coverage area of ​​the service satellite (earth-fixed scenario).

[0105] Specifically, the terminal device can determine the horizontal distance component and the vertical distance component between the terminal device and the reference position of the service satellite based on its own position information and the ephemeris of the service satellite; and then determine whether to start acquiring the OSI broadcast by the network device at the coverage edge wave position based on the horizontal distance component, the vertical distance component and the first indication information.

[0106] Further, when the horizontal distance component is greater than or equal to the horizontal distance threshold value, or the vertical distance threshold value is greater than or equal to the vertical distance threshold value, it is determined that the terminal device is in the coverage edge wave position of the service satellite. If the terminal device is in the coverage edge wave position of the service satellite and there is no valid OSI, the acquisition of the OSI broadcasted by the network device in the coverage edge wave position is started. When the horizontal distance component is less than the horizontal distance threshold value, and the vertical distance threshold value is less than the vertical distance threshold value, it is determined that the terminal device is not in the coverage edge wave position of the service satellite. If the terminal device is not in the coverage edge wave position of the service satellite, or has a valid OSI, the acquisition of the OSI broadcasted by the network device in the coverage edge wave position is not started. Among them, the absence of a valid OSI means that the OSI has not been obtained, the OSI has changed, or the ephemeris of the neighboring satellite has expired, and the presence of a valid OSI means that the OSI has been obtained, the OSI has not changed, or the ephemeris of the neighboring satellite has not expired. Since the OSI acquisition process is started only when the terminal device is in the coverage edge wave position, the network device does not need to page the terminal device to receive the OSI, thereby reducing the paging overhead.

[0107] For example, Figure 5A As shown, Figure 5A It is a schematic diagram of a rectangular coverage scenario. Area 1 is the ground coverage area of ​​the service satellite, Area 2 is the coverage center area within the ground coverage area, the coverage edge wave position is the wave position of (area 1-area 2), and the four sides of the rectangle are all coverage edge wave positions. Figure 5B As shown, Figure 5B It is a schematic diagram of another rectangular coverage scenario. Area 1 is the ground coverage area of ​​the service satellite, and area 2 is the coverage center area within the ground coverage area. The coverage edge wave position is the wave position of (area 1-area 2). The three sides of the rectangle are coverage edge wave positions, and there is no coverage edge wave position at one of the sides of the rectangle. Of course, there may also be coverage edge wave positions at two of the sides of the rectangle, and there is no coverage edge wave at the other two sides of the rectangle. The coverage edge wave position may also be in other forms, which is not limited by the present application.

[0108] The network device can broadcast the first ephemeris information in all wave positions within area 1, and broadcast OSI in the wave position at the coverage edge (area 1-area 2). The horizontal distance threshold is the minimum horizontal distance d_th1 from the center point of the ground coverage area to the coverage edge wave position, and the vertical distance threshold is the minimum vertical distance d_th2 from the center point of the ground coverage area to the coverage edge wave position. The distance from the terminal device to the center point of the ground coverage area is d, where the horizontal distance component is d1 and the vertical distance component is d2. For Figure 5A For the coverage edge wave position shown, the vertical component d2 calculated by the terminal equipment is parallel to the direction of satellite motion and is a scalar. Figure 5B In the coverage edge wave position shown, the positive direction of the vertical component d2 calculated by the terminal device is opposite to the direction of satellite movement, which is a vector. It can be seen from the figure that the horizontal distance component d1 is less than the horizontal distance threshold value d_th1, and the vertical distance component d2 is less than the vertical distance threshold value d_th2, that is, the terminal device is not in the coverage edge wave position of the service satellite, and does not start to obtain the OSI broadcast by the network device in the coverage edge wave position.

[0109] In another implementation, in a scenario where the ground coverage area of ​​the service satellite is circular, the first indication information includes a first distance threshold value or an elevation threshold value. The first distance threshold value may be a distance threshold value between the terminal device and the service satellite, or a distance threshold value between the terminal device and the reference position of the service satellite, or a distance threshold value between the terminal device and the edge of the ground coverage area of ​​the service satellite. The elevation threshold value may be an angle threshold value between a line connecting the terminal device to the service satellite and a tangent line to the earth's surface, and the range of the elevation threshold value is [0°, 90°]. The reference position of the service satellite is the sub-satellite point of the service satellite (earth-moving scenario), or the center point of the ground coverage area of ​​the service satellite (earth-fixed scenario).

[0110] In the case where the first distance threshold is the distance threshold between the terminal device and the service satellite, the terminal device can determine the first distance between the terminal device and the service satellite according to its own location information and the ephemeris of the service satellite; then determine whether to start acquiring the OSI broadcast by the network device at the coverage edge wave position according to the first distance and the first indication information. Further, when the first distance is greater than or equal to the first distance threshold, it is determined that the terminal device is at the coverage edge wave position of the service satellite. If the terminal device is at the coverage edge wave position of the service satellite and there is no valid OSI, then the acquisition of the OSI broadcast by the network device at the coverage edge wave position is started; when the first distance is less than the first distance threshold, it is determined that the terminal device is not at the coverage edge wave position of the service satellite. If the terminal device is not at the coverage edge wave position of the service satellite or has a valid OSI, then the acquisition of the OSI broadcast by the network device at the coverage edge wave position is not started. Since the OSI acquisition process is started only when the terminal device is at the coverage edge wave position, the network device does not need to page the terminal device to receive the OSI, thereby reducing the paging overhead.

[0111] For example, Fig. 6A As shown, Fig. 6A It is a schematic diagram of a circular coverage scenario. Area 1 is the ground coverage area of ​​the service satellite, area 2 is the coverage center area within the ground coverage area, the coverage edge wave position is the (area 1-area 2) wave position, and the edge and peripheral positions of the circle are all coverage edge wave positions. The network device can broadcast the first ephemeris information in all wave positions within area 1, and broadcast OSI in the coverage edge (area 1-area 2) wave position. The first distance threshold value is the distance threshold value d_thr between the terminal device and the service satellite, that is, if the first distance d between the terminal device and the service satellite is greater than or equal to d_thr, the terminal device is considered to be in the coverage edge wave position, and the OSI acquisition process can be started. If the first distance d between the terminal device and the service satellite is less than d_thr, the terminal device is considered to be in the coverage center area wave position, and the OSI acquisition process is not started.

[0112] In the case where the first distance threshold is the distance threshold of the reference position of the terminal device and the service satellite, the terminal device can determine the second distance between the terminal device and the reference position of the service satellite based on its own position information and the ephemeris of the service satellite; then determine whether to start acquiring the OSI broadcast by the network device at the coverage edge wave position according to the second distance and the first indication information. Further, when the second distance is greater than or equal to the first distance threshold, it is determined that the terminal device is at the coverage edge wave position of the service satellite. If the terminal device is at the coverage edge wave position of the service satellite and there is no valid OSI, then the acquisition of the OSI broadcast by the network device at the coverage edge wave position is started. When the second distance is less than the first distance threshold, it is determined that the terminal device is not at the coverage edge wave position of the service satellite. If the terminal device is not at the coverage edge wave position of the service satellite or has a valid OSI, then the acquisition of the OSI broadcast by the network device at the coverage edge wave position is not started. Since the OSI acquisition process is started only when the terminal device is at the coverage edge wave position, the network device does not need to page the terminal device to receive the OSI, thereby reducing the paging overhead.

[0113] In the case where the first distance threshold is the distance threshold of the edge of the ground coverage area between the terminal device and the service satellite, the terminal device can determine the ground coverage area of ​​the service satellite according to the ephemeris and coverage information of the service satellite, and then determine the third distance between the terminal device and the edge of the ground coverage area according to its own position information and the ground coverage area. Wherein, the coverage information may include the maximum scanning angle of the service satellite, and the third distance is the minimum distance from the terminal device to the edge of the ground coverage area. According to the third distance and the first indication information, it is determined whether to start acquiring other system information OSI broadcasted by the network device at the coverage edge wave position. Further, when the third distance is less than or equal to the first distance threshold, it is determined that the terminal device is at the coverage edge wave position of the service satellite. If the terminal device is at the coverage edge wave position of the service satellite and there is no valid OSI, then the acquisition of the OSI broadcasted by the network device at the coverage edge wave position is started. When the second distance is greater than the first distance threshold, it is determined that the terminal device is not at the coverage edge wave position of the service satellite. If the terminal device is not at the coverage edge wave position of the service satellite or has a valid OSI, the acquisition of the OSI broadcasted by the network device at the coverage edge wave position is not started. Since the OSI acquisition process is initiated only when the terminal device is at the coverage edge, the network device does not need to page the terminal device to receive the OSI, thus reducing the paging overhead.

[0114] In addition, the terminal device can determine the first angle between the line connecting the terminal device to the service satellite and the tangent of the earth's surface according to its own location information and the ephemeris of the service satellite; and determine whether to start acquiring the OSI broadcast by the network device at the coverage edge wave position according to the first angle and the first indication information. Further, when the first angle is less than or equal to the elevation angle threshold value, it is determined that the terminal device is at the coverage edge wave position of the service satellite. If the terminal device is at the coverage edge wave position of the service satellite and there is no valid OSI, then the acquisition of the OSI broadcast by the network device at the coverage edge wave position is started. When the first angle is greater than the elevation angle threshold value, it is determined that the terminal device is not at the coverage edge wave position of the service satellite. If the terminal device is not at the coverage edge wave position of the service satellite or there is no valid OSI, then the acquisition of the OSI broadcast by the network device at the coverage edge wave position is not started.

[0115] For example, Figure 6B As shown, Figure 6B It is a schematic diagram of another circular coverage scenario. Area 1 is the ground coverage area of ​​the service satellite, area 2 is the coverage center area within the ground coverage area, the coverage edge wave position is (area 1-area 2) wave position, and there are coverage edge wave positions at the peripheral positions of the circle. The network device can broadcast the first ephemeris information at all wave positions in area 1, and broadcast OSI at the coverage edge (area 1-area 2) wave position. The elevation angle threshold value is the angle threshold value q_thr between the line between the terminal device and the service satellite and the tangent of the earth's surface, that is, if the first angle q between the line between the terminal device and the service satellite and the tangent of the earth's surface is less than or equal to q_thr, the terminal device is considered to be in the coverage edge wave position, and the OSI acquisition process can be started. If the first angle q between the line between the terminal device and the service satellite and the tangent of the earth's surface is greater than or equal to q_thr, the terminal device is considered to be in the coverage center area wave position, and the OSI acquisition process is not started.

[0116] In another implementation, in a scenario where the ground coverage area of ​​the service satellite is non-circular, the first indication information includes a second distance threshold value, and the second distance threshold value is a distance threshold value between the terminal device and the edge of the ground coverage area of ​​the service satellite. The first ephemeris information also includes ephemeris and coverage information of the service satellite. For example, if the ground coverage area is rectangular, the coverage information may include a maximum horizontal scanning angle and a maximum vertical scanning angle.

[0117] Specifically, the terminal device can determine the ground coverage area of ​​the service satellite according to the ephemeris and coverage information of the service satellite; then determine the minimum distance between the terminal device and the edge of the ground coverage area according to its own location information and the ground coverage area; and determine whether to start acquiring other system information OSI broadcast by the network device at the coverage edge wave position according to the minimum distance and the first indication information. Further, when the minimum distance is less than or equal to the second distance threshold value, it is determined that the terminal device is at the coverage edge wave position of the service satellite. If the terminal device is at the coverage edge wave position of the service satellite and there is no valid OSI, then the acquisition of the OSI broadcast by the network device at the coverage edge wave position is started; when the minimum distance is greater than the second distance threshold value, it is determined that the terminal device is not at the coverage edge wave position of the service satellite. If the terminal device is not at the coverage edge wave position of the service satellite or has a valid OSI, then the acquisition of the OSI broadcast by the network device at the coverage edge wave position is not started. Since the OSI acquisition process is only started when the terminal device is at the coverage edge wave position, the network device does not need to page the terminal device to receive the OSI, thereby reducing the paging overhead.

[0118] For example, Figure 7 As shown, Figure 7 It is a schematic diagram of a non-circular coverage scenario. Area 1 is the ground coverage area of ​​the service satellite, area 2 is the coverage center area within the ground coverage area, the coverage edge wave position is (area 1-area 2) wave position, and the edge positions around the rectangle are all coverage edge wave positions. The network device can broadcast the first ephemeris information at all wave positions in area 1, and broadcast OSI at the coverage edge (area 1-area 2) wave position. The second distance threshold value is the distance threshold value d_thr between the terminal device and the edge of the ground coverage area of ​​the service satellite, that is, if the minimum distance d between the terminal device and the edge of the ground coverage area of ​​the service satellite is less than or equal to d_thr, the terminal device is considered to be in the coverage edge wave position, and the OSI acquisition process is started. If the minimum distance d between the terminal device and the edge of the ground coverage area of ​​the service satellite is greater than d_thr, the terminal device is considered to be in the coverage center wave position, and the OSI acquisition process is not started.

[0119] Optionally, the terminal device may receive OSI according to the scheduling information obtained from SIB1, and then obtain cell reselection parameters and / or the second ephemeris information of the neighboring satellite from OSI, and perform cell reselection or cell switching according to the cell reselection parameters or the second ephemeris information, so as to reselect or switch to the cell of the neighboring satellite to ensure the communication quality between the terminal device and the satellite. The cell reselection parameters may include common parameters for cell reselection, neighboring cell parameters for same-frequency cell reselection, neighboring cell parameters for frequency cell reselection, or neighboring cell parameters for inter-RAT cell reselection, etc.

[0120] In the embodiment of the present application, the network device only broadcasts the OSI related to mobility management at the coverage edge wave position of the service satellite, thereby reducing the broadcast resource overhead and not affecting the terminal device to perform cell reselection / conditional switching. The terminal device determines whether it is at the coverage edge wave position according to the threshold value of the coverage edge wave position of the service satellite indicated by the first indication information. If the terminal device is at the coverage edge wave position, the OSI acquisition process is started, and the network device does not need to page the terminal to receive the OSI, thereby reducing the paging overhead. If the terminal device is not at the coverage edge wave position, the OSI acquisition process is not started, thereby reducing the power consumption of the terminal device.

[0121] It can be understood that in the above-mentioned method embodiments, the methods and operations implemented by the terminal device can also be implemented by components that can be used for the terminal device (such as chips or circuits), and the methods and operations implemented by the network device can also be implemented by components that can be used for the network device (such as chips or circuits).

[0122] The embodiment of the present application can divide the functional modules of the terminal device or network device according to the above method example. For example, each functional module can be divided corresponding to each function, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. The following is an example of using each functional module divided according to each function to illustrate.

[0123] Above, combined Figure 4 The method provided by the embodiment of the present application is described in detail. Figures 8 to 9 The communication device provided in the embodiment of the present application is described in detail. It should be understood that the description of the device embodiment corresponds to the description of the method embodiment, so the contents not described in detail can be referred to the method embodiment above, and will not be repeated here for the sake of brevity.

[0124] See also Figure 8 , Figure 8 801 is a schematic diagram of a communication device provided in an embodiment of the present application. The communication device may include a receiving module 801 and a processing module 802.

[0125] The communication device can implement the steps or processes executed by the terminal device in the above method embodiment, for example, it can be a terminal device, or a chip or circuit configured in the terminal device. The receiving module 801 is used to perform the sending and receiving related operations on the terminal device side in the above method embodiment, and the processing module 802 is used to perform the processing related operations of the terminal device in the above method embodiment.

[0126] A receiving module 801 is configured to receive first ephemeris information of a service satellite sent by a network device, where the first ephemeris information includes first indication information, where the first indication information is used to indicate a threshold value of a coverage edge wave position of the service satellite;

[0127] The processing module 802 is used to determine whether to start obtaining other system information OSI broadcast by the network device at the coverage edge wavelength based on the first ephemeris information, where the OSI is related to mobility management.

[0128] Optionally, the first ephemeris information also includes the ephemeris of the service satellite, and the processing module 802 is further used to determine the horizontal distance component and the vertical distance component between the terminal device and the reference position of the service satellite based on its own position information and the ephemeris of the service satellite; and determine whether to start acquiring the OSI broadcast by the network device at the coverage edge wave position based on the horizontal distance component, the vertical distance component and the first indication information.

[0129] Optionally, the first indication information includes a horizontal distance threshold value and a vertical distance threshold value; the processing module 802 is also used to determine that the terminal device is at the coverage edge wave position of the service satellite when the horizontal distance component is greater than or equal to the horizontal distance threshold value, or the vertical distance threshold value is greater than or equal to the vertical distance threshold value, and start obtaining the OSI broadcast by the network device at the coverage edge wave position; when the horizontal distance component is less than the horizontal distance threshold value and the vertical distance threshold value is less than the vertical distance threshold value, it is determined that the terminal device is not at the coverage edge wave position of the service satellite, and the acquisition of the OSI broadcast by the network device at the coverage edge wave position is not started.

[0130] Optionally, the reference position of the service satellite is the sub-satellite point of the service satellite, or the center point of the ground coverage area of ​​the service satellite.

[0131] Optionally, the first ephemeris information also includes the ephemeris of the service satellite, and the processing module 802 is further used to determine the first distance between the terminal device and the service satellite based on its own position information and the ephemeris of the service satellite; and determine whether to start obtaining the OSI broadcast by the network device at the coverage edge wave position based on the first distance and the first indication information.

[0132] Optionally, the first indication information includes a first distance threshold value; the processing module is further used to determine that the terminal device is at the coverage edge wave position of the service satellite when the first distance is greater than or equal to the first distance threshold value, and start obtaining the OSI broadcast by the network device at the coverage edge wave position; when the first distance is less than the first distance threshold value, determine that the terminal device is not at the coverage edge wave position of the service satellite, and do not start obtaining the OSI broadcast by the network device at the coverage edge wave position.

[0133] Optionally, the first ephemeris information also includes the ephemeris of the service satellite, and the processing module 802 is further used to determine a first angle between a line between a terminal device and the service satellite and a tangent to the earth's surface based on its own position information and the ephemeris of the service satellite; and determine whether to start acquiring the OSI broadcast by the network device at the coverage edge wave position based on the first angle and the first indication information.

[0134] Optionally, the first indication information includes an elevation angle threshold value; the processing module 802 is also used to determine that the terminal device is at the coverage edge wave position of the service satellite when the first angle is less than or equal to the elevation angle threshold value, and start obtaining the OSI broadcast by the network device at the coverage edge wave position; when the first angle is greater than the elevation angle threshold value, determine that the terminal device is not at the coverage edge wave position of the service satellite, and do not start obtaining the OSI broadcast by the network device at the coverage edge wave position.

[0135] Optionally, the first ephemeris information also includes the ephemeris and coverage information of the service satellite. The processing module 802 is further used to determine the ground coverage area of ​​the service satellite based on the ephemeris and the coverage information of the service satellite; determine the minimum distance between the terminal device and the edge of the ground coverage area based on its own position information and the ground coverage area; and determine whether to start obtaining other system information OSI broadcast by the network device at the coverage edge wave position based on the minimum distance and the first indication information.

[0136] Optionally, the first indication information includes a second distance threshold value; the processing module 802 is also used to determine that the terminal device is at the coverage edge wave position of the service satellite when the minimum distance is less than or equal to the second distance threshold value, and start obtaining the OSI broadcast by the network device at the coverage edge wave position; when the minimum distance is greater than the second distance threshold value, determine that the terminal device is not at the coverage edge wave position of the service satellite, and do not start obtaining the OSI broadcast by the network device at the coverage edge wave position.

[0137] Optionally, the coverage range information includes at least one of the following information: maximum scanning angle, coverage radius, maximum horizontal scanning angle, maximum vertical scanning angle, horizontal coverage width, or vertical coverage width.

[0138] Optionally, the processing module 802 is further configured to obtain a cell reselection parameter and / or second ephemeris information of a neighboring satellite from the OSI; and perform cell reselection or cell switching according to the cell reselection parameter and / or the second ephemeris information.

[0139] It should be noted that the implementation of each module can also refer to Figure 4 The corresponding description of the method embodiment shown executes the method and functions performed by the terminal device in the above embodiment.

[0140] See also Fig. 9 , Fig. 9 901 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application. The communication device may include a sending module 901. The communication device may implement the steps or processes executed by the network device in the above method embodiment, for example, it may be a network device, or a chip or circuit configured in the network device. The sending module 901 is used to perform the sending and receiving related operations on the network device side in the above method embodiment.

[0141] A sending module 901 is used to send first ephemeris information of a service satellite, where the first ephemeris information includes first indication information, where the first indication information is used to indicate a threshold value of a coverage edge wave position of the service satellite;

[0142] The sending module 901 is further configured to broadcast other system information OSI at the coverage edge wave position, where the OSI is related to mobility management.

[0143] Optionally, the first ephemeris information also includes at least one of the following information: ephemeris of the service satellite, or coverage information of the service satellite.

[0144] Optionally, the first indication information includes at least one item of the following information: a horizontal distance threshold value and a vertical distance threshold value between the terminal device and the reference position of the service satellite, an elevation angle threshold value between the line between the terminal device and the service satellite and the tangent line of the earth's surface, a first distance threshold value between the terminal device and the service satellite, and a second distance threshold value between the terminal device and the edge of the ground coverage area of ​​the service satellite.

[0145] Optionally, the reference position of the service satellite is the sub-satellite point of the service satellite, or the center point of the ground coverage area of ​​the service satellite.

[0146] It should be noted that the implementation of each module can also refer to Figure 4 The corresponding description of the method embodiment shown executes the method and functions performed by the network device in the above embodiment.

[0147] Fig.10 is a schematic diagram of the structure of a terminal device provided in an embodiment of the present application. The terminal device can be applied to Figure 1 , Figure 2A and Figure 2B In the system shown, the functions of the terminal device in the above method embodiment are executed, or the steps or processes executed by the terminal device in the above method embodiment are realized.

[0148] like Fig.10 As shown, the terminal device includes a processor 1001 and a transceiver 1002. Optionally, the terminal device also includes a memory 1003. The processor 1001, the transceiver 1002 and the memory 1003 can communicate with each other through an internal connection path to transmit control and / or data signals. The memory 1003 is used to store a computer program, and the processor 1001 is used to call and run the computer program from the memory 1003 to control the transceiver 1002 to send and receive signals. Optionally, the terminal device may also include an antenna for sending the uplink data or uplink control signaling output by the transceiver 1002 through a wireless signal.

[0149] The processor 1001 and the memory 1003 may be combined into a processing device, and the processor 1001 is used to execute the program code stored in the memory 1003 to implement the above functions. In specific implementation, the memory 1003 may also be integrated into the processor 1001, or independent of the processor 1001. Figure 8 Corresponding to the processing module in.

[0150] The transceiver 1002 can be used with Figure 8 The transceiver 1002 may include a receiver (or receiver, receiving circuit) and a transmitter (or transmitter, transmitting circuit). The receiver is used to receive signals, and the transmitter is used to transmit signals.

[0151] It should be understood that Fig.10 The terminal equipment shown is capable of implementing Figure 4 The method embodiment shown involves various processes of the terminal device. The operations and / or functions of each module in the terminal device are respectively to implement the corresponding processes in the above method embodiment. For details, please refer to the description in the above method embodiment. To avoid repetition, the detailed description is appropriately omitted here.

[0152] The processor 1001 can be used to execute the actions implemented by the terminal device in the previous method embodiment, and the transceiver 1002 can be used to execute the actions of the terminal device sending to or receiving from the terminal device described in the previous method embodiment. Please refer to the description in the previous method embodiment for details, which will not be repeated here.

[0153] Among them, the processor 1001 can be a central processing unit, a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a transistor logic device, a hardware component or any combination thereof. It can implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the contents disclosed in this application. The processor 1001 can also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a digital signal processor and a microprocessor, and so on. The communication bus 1004 can be a peripheral component interconnect standard PCI bus or an extended industrial standard structure EISA bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig.10 Only one thick line is used to represent it, but it does not mean that there is only one bus or one type of bus. The communication bus 1004 is used to realize the connection and communication between these components. Among them, the transceiver 1002 in the embodiment of the present application is used to communicate signaling or data with other node devices. The memory 1003 may include volatile memory, such as nonvolatile dynamic random access memory (NVRAM), phase change random access memory (PRAM), magnetoresistive random access memory (MRAM), etc., and may also include non-volatile memory, such as at least one disk storage device, electrically erasable programmable read-only memory (EEPROM), flash memory devices, such as NOR flash memory or NAND flash memory, semiconductor devices, such as solid state disk (SSD), etc. The memory 1003 may also be at least one storage device located away from the aforementioned processor 1001. The memory 1003 may optionally store a set of computer program codes or configuration information. Optionally, the processor 1001 may also execute a program stored in the memory 1003. The processor may cooperate with the memory and the transceiver to execute any method and function of the terminal device in the above-mentioned application embodiment.

[0154] Fig.11is a schematic diagram of the structure of a network device provided in an embodiment of the present application. The network device can be applied to Figure 1 , Figure 2A and Figure 2B In the system shown, the functions of the network device in the above method embodiment are executed, or the steps or processes executed by the network device in the above method embodiment are realized.

[0155] like Fig.11 As shown, the network device includes a processor 1101 and a transceiver 1102. Optionally, the network device also includes a memory 1103. The processor 1101, the transceiver 1102 and the memory 1103 can communicate with each other through an internal connection path to transmit control and / or data signals. The memory 1103 is used to store a computer program, and the processor 1101 is used to call and run the computer program from the memory 1103 to control the transceiver 1102 to send and receive signals. Optionally, the network device may also include an antenna for sending the uplink data or uplink control signaling output by the transceiver 1102 through a wireless signal.

[0156] The processor 1101 and the memory 1103 may be combined into a processing device, and the processor 1101 is used to execute the program code stored in the memory 1103 to implement the above functions. In specific implementation, the memory 1103 may also be integrated into the processor 1101, or independent of the processor 1101.

[0157] The transceiver 1102 can be used with Fig. 9 The transceiver 1102 may include a receiver (or receiver, receiving circuit) and a transmitter (or transmitter, transmitting circuit). The receiver is used to receive signals, and the transmitter is used to transmit signals.

[0158] It should be understood that Fig.11 The network equipment shown can achieve Figure 4 The method embodiment shown involves various processes of the network device. The operations and / or functions of each module in the network device are respectively to implement the corresponding processes in the above method embodiment. For details, please refer to the description in the above method embodiment. To avoid repetition, the detailed description is appropriately omitted here.

[0159] The processor 1101 can be used to execute the actions implemented by the network device in the previous method embodiment, and the transceiver 1102 can be used to execute the actions of the network device sending to or receiving from the network device described in the previous method embodiment. Please refer to the description in the previous method embodiment for details, which will not be repeated here.

[0160] The processor 1101 may be any of the above mentioned processors. The communication bus 1104 may be a PCI bus or an EISA bus. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig.11 Only one thick line is used to represent it, but it does not mean that there is only one bus or one type of bus. The communication bus 1104 is used to realize the connection and communication between these components. Among them, the transceiver 1102 of the device in the embodiment of the present application is used to communicate signaling or data with other devices. The memory 1103 can be the various types of memory mentioned above. The memory 1103 can also be at least one storage device located away from the aforementioned processor 1101. A group of computer program codes or configuration information are stored in the memory 1103, and the processor 1101 executes the program in the memory 1103. The processor can cooperate with the memory and the transceiver to execute any one of the methods and functions of the network device in the above-mentioned application embodiment.

[0161] An embodiment of the present application also provides a chip system, which includes a processor for supporting a terminal device or a network device to implement the functions involved in any of the above embodiments, such as generating or processing the first ephemeris information involved in the above method.

[0162] In one possible design, the chip system may also include a memory, which is used for computer programs and data necessary for the terminal device or network device. The chip system may be composed of a chip, or may include a chip and other discrete devices. The input and output of the chip system correspond to the receiving and sending operations of the terminal device or network device in the method embodiment, respectively.

[0163] According to the method provided in the embodiment of the present application, the present application also provides a computer program product, the computer program product comprising: a computer program, when the computer program is run on a computer, causes the computer to execute Figure 4 A method according to any one of the embodiments shown.

[0164] According to the method provided in the embodiment of the present application, the present application also provides a computer-readable medium, which stores a computer program, and when the computer program is run on a computer, the computer executes Figure 4 A method according to any one of the embodiments shown.

[0165] According to the method provided in the embodiment of the present application, the present application also provides a communication system, which includes one or more terminal devices and one or more network devices as mentioned above.

[0166] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrated. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a high-density digital video disc (DVD)), or a semiconductor medium (eg, a solid state disc (SSD)).

[0167] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A communication method, characterized in that: The method comprises: Receiving first ephemeris information of a service satellite sent by a network device, where the first ephemeris information includes first indication information, where the first indication information is used to indicate a threshold value of a coverage edge wave position of the service satellite; Based on the first ephemeris information, it is determined whether to start acquiring other system information OSI broadcast by the network device at the coverage edge wavelength, where the OSI is related to mobility management.

2. The method according to claim 1, characterized in that The first ephemeris information also includes the ephemeris of the service satellite, and the determining whether to start acquiring other system information OSI broadcast by the network device at the coverage edge wave position based on the first ephemeris information includes: Determine the horizontal distance component and the vertical distance component between the terminal device and the reference position of the service satellite according to its own position information and the ephemeris of the service satellite; Determine whether to start acquiring the OSI broadcast by the network device at the coverage edge wave position according to the horizontal distance component, the vertical distance component and the first indication information.

3. The method according to claim 2, characterized in that The first indication information includes a horizontal distance threshold value and a vertical distance threshold value; and the determining whether to start acquiring the OSI broadcast by the network device at the coverage edge wave position according to the horizontal distance component, the vertical distance component and the first indication information includes: When the horizontal distance component is greater than or equal to the horizontal distance threshold value, or the vertical distance threshold value is greater than or equal to the vertical distance threshold value, determining that the terminal device is at the coverage edge wave position of the service satellite, and starting to obtain the OSI broadcast by the network device at the coverage edge wave position; When the horizontal distance component is less than the horizontal distance threshold value and the vertical distance threshold value is less than the vertical distance threshold value, it is determined that the terminal device is not in the coverage edge wave position of the service satellite, and the acquisition of the OSI broadcast by the network device at the coverage edge wave position is not started.

4. The method according to claim 2 or 3, characterized in that The reference position of the service satellite is the sub-satellite point of the service satellite or the center point of the ground coverage area of ​​the service satellite.

5. The method according to claim 1, characterized in that The first ephemeris information also includes the ephemeris of the service satellite, and the determining whether to start acquiring other system information OSI broadcast by the network device at the coverage edge wave position based on the first ephemeris information includes: Determine a first distance between the terminal device and the service satellite according to the terminal device's own position information and the ephemeris of the service satellite; Determine whether to start acquiring the OSI broadcast by the network device at the coverage edge wavelength according to the first distance and the first indication information.

6. The method according to claim 5, characterized in that The first indication information includes a first distance threshold value; and determining whether to start acquiring the OSI broadcast by the network device at the coverage edge wave position according to the first distance and the first indication information includes: When the first distance is greater than or equal to the first distance threshold, determining that the terminal device is at the coverage edge wave position of the service satellite, and starting to obtain the OSI broadcast by the network device at the coverage edge wave position; When the first distance is less than the first distance threshold, it is determined that the terminal device is not in the coverage edge wave position of the service satellite, and acquisition of the OSI broadcast by the network device in the coverage edge wave position is not initiated.

7. The method according to claim 1, characterized in that The first ephemeris information also includes the ephemeris of the service satellite, and the determining whether to start acquiring other system information OSI broadcast by the network device at the coverage edge wave position based on the first ephemeris information includes: Determine a first angle between a line between the terminal device and the service satellite and a tangent line to the earth's surface based on its own position information and the ephemeris of the service satellite; Determine whether to start acquiring the OSI broadcast by the network device at the coverage edge wave position according to the first angle and the first indication information.

8. The method according to claim 7, characterized in that The first indication information includes an elevation angle threshold value; and determining whether to start acquiring the OSI broadcast by the network device at the coverage edge wave position according to the first angle and the first indication information includes: When the first angle is less than or equal to the elevation angle threshold, determining that the terminal device is at the coverage edge wave position of the service satellite, and starting to obtain the OSI broadcast by the network device at the coverage edge wave position; When the first angle is greater than the elevation angle threshold, it is determined that the terminal device is not in the coverage edge wave position of the service satellite, and acquisition of the OSI broadcast by the network device at the coverage edge wave position is not initiated.

9. The method according to claim 1, characterized in that The first ephemeris information also includes ephemeris and coverage information of the service satellite. The determining whether to start acquiring other system information OSI broadcast by the network device at the coverage edge wave position based on the first ephemeris information includes: Determining a ground coverage area of ​​the service satellite according to the ephemeris of the service satellite and the coverage range information; Determine the minimum distance between the terminal device and the edge of the ground coverage area according to the terminal device's own location information and the ground coverage area; According to the minimum distance and the first indication information, it is determined whether to start obtaining other system information OSI broadcast by the network device at the coverage edge wavelength.

10. The method according to claim 9, characterized in that The first indication information includes a second distance threshold value; and the determining whether to start acquiring other system information OSI broadcast by the network device at the coverage edge wave position according to the minimum distance and the first indication information includes: When the minimum distance is less than or equal to the second distance threshold, determining that the terminal device is at the coverage edge wave position of the service satellite, and starting to obtain the OSI broadcast by the network device at the coverage edge wave position; When the minimum distance is greater than the second distance threshold, it is determined that the terminal device is not in the coverage edge wave position of the service satellite, and acquisition of the OSI broadcast by the network device in the coverage edge wave position is not initiated.

11. The method according to claim 9 or 10, characterized in that The coverage range information includes at least one of the following information: a maximum scanning angle, a coverage radius, a maximum horizontal scanning angle, a maximum vertical scanning angle, a horizontal coverage width, or a vertical coverage width.

12. The method according to any one of claims 1 to 11, characterized in that: The method further comprises: Acquire cell reselection parameters and / or second ephemeris information of neighboring satellites from the OSI; Cell reselection or cell switching is performed according to the cell reselection parameter and / or the second ephemeris information.

13. A communication method, characterized in that: The method comprises: Sending first ephemeris information of a service satellite, where the first ephemeris information includes first indication information, where the first indication information is used to indicate a threshold value of a coverage edge wave position of the service satellite; Other system information OSI is broadcasted in the coverage edge wave, and the OSI is related to mobility management.

14. The method according to claim 13, characterized in that The first ephemeris information further includes at least one of the following information: the ephemeris of the service satellite, or the coverage information of the service satellite.

15. The method according to claim 13 or 14, characterized in that The first indication information includes at least one of the following information: The horizontal distance threshold and vertical distance threshold of the reference position of the terminal device and the service satellite, the elevation angle threshold of the line between the terminal device and the service satellite and the tangent of the earth's surface, the first distance threshold between the terminal device and the service satellite, and the second distance threshold between the terminal device and the edge of the ground coverage area of ​​the service satellite.

16. The method according to claim 15, characterized in that The reference position of the service satellite is the sub-satellite point of the service satellite or the center point of the ground coverage area of ​​the service satellite.

17. A communication device, characterized in that: The communication device comprises a memory and a processor, wherein the memory is used to store a computer program, and the processor runs the computer program to enable the communication device to perform the method according to any one of claims 1 to 12.

18. A communication device, characterized in that: The device comprises a memory and a processor, wherein the memory is used to store a computer program, and the processor runs the computer program to enable the communication device to perform the method according to any one of claims 13 to 16.

19. A computer-readable storage medium, characterized in that: The computer-readable storage medium comprises a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 16 is implemented.

20. A chip, characterized in that: The chip includes a processor and a communication interface, wherein the communication interface is used to communicate with an external device or an internal device, and the processor is used to implement the method according to any one of claims 1-16.

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