WO2025001960A1 - 切换方法、终端、通信系统以及电子设备 - Google Patents

切换方法、终端、通信系统以及电子设备 Download PDF

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Publication number
WO2025001960A1
WO2025001960A1 PCT/CN2024/100385 CN2024100385W WO2025001960A1 WO 2025001960 A1 WO2025001960 A1 WO 2025001960A1 CN 2024100385 W CN2024100385 W CN 2024100385W WO 2025001960 A1 WO2025001960 A1 WO 2025001960A1
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WIPO (PCT)
Prior art keywords
terminal
satellite
information
switching
target
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PCT/CN2024/100385
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English (en)
French (fr)
Inventor
贾靖
聂衡
王恒
夏旭
梅承力
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China Telecom Corp Ltd
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China Telecom Corp Ltd
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Publication of WO2025001960A1 publication Critical patent/WO2025001960A1/zh
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/36—Reselection control by user or terminal equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/06—Airborne or Satellite Networks

Definitions

  • the present disclosure relates to the field of communication technology, and in particular to a switching method, a terminal, a communication system and an electronic device.
  • Satellites have gradually acquired some functions of base stations or core networks in various architectures.
  • a switching method comprising: a first terminal sends a switching request to a second terminal via a source satellite, wherein the first terminal establishes a communication link between the second terminal via the source satellite, and the switching request includes at least one of a satellite reselection indication and ephemeris information of a candidate satellite; the first terminal receives a switching confirmation message sent by the second terminal via the source satellite, wherein the switching confirmation message includes information of a target satellite, and the target satellite is determined by the second terminal according to the switching request; the first terminal switches to the target satellite, and establishes a communication link with the second terminal via the target satellite.
  • the method also includes: the first terminal determines whether to perform satellite switching based on the ephemeris information of each satellite and the connection information between each satellite; wherein the first terminal sends a switching request to the second terminal through the source satellite includes: when the first terminal determines to perform satellite switching, the first terminal sends a switching request to the second terminal through the source satellite.
  • the candidate satellites are selected by the first terminal based on the ephemeris information of each satellite and the distance between each satellite.
  • the connection information is determined by
  • the handover confirmation message also includes: security information for verifying whether the communication link is successfully established.
  • the target satellite when the switching request includes ephemeris information of the candidate satellite or when the satellite reselection indication includes the identifier of the candidate satellite, the target satellite is determined by the second terminal based on the ephemeris information of the candidate satellite; or, when the switching request does not include the ephemeris information of the candidate satellite and the satellite reselection indication is used to indicate reselection of the connected satellite, the target satellite is determined by the second terminal based on the ephemeris information of each satellite; or, when the switching request does not include the ephemeris information of the candidate satellite and the satellite reselection indication includes the identifier of the target satellite, the target satellite is determined by the second terminal directly based on the identifier of the target satellite.
  • the method further includes: the first terminal establishing a connection with a source satellite, and establishing a communication link with the second terminal through the source satellite.
  • the method further includes: before the first terminal receives a switching confirmation message sent by the second terminal via the source satellite, when the switching request includes ephemeris information of the candidate satellite or when the satellite reselection indication includes an identifier of the candidate satellite, the source satellite sends the stored context information of the first terminal and the context information of the second terminal to the candidate satellite, wherein the context information of the first terminal and the context information of the second terminal are used for authorization and authentication of the first terminal and the second terminal during the switching process.
  • the method further includes: after the first terminal receives a switching confirmation message sent by the second terminal via the source satellite, the source satellite sends the stored context information of the first terminal and the context information of the second terminal to the target satellite, wherein the context information of the first terminal and the context information of the second terminal are used for authorization and authentication of the first terminal and the second terminal during the switching process.
  • a switching method comprising: a second terminal receives a switching request sent by a first terminal through a source satellite, wherein the first terminal establishes a communication link between the source satellite and the second terminal, and the switching request includes: a satellite reselection indication and at least one of ephemeris information of a candidate satellite; the second terminal determines information of a target satellite according to the switching request; the second terminal sends a switching confirmation message to the first terminal through the source satellite, wherein the switching confirmation message includes information of the target satellite; the second terminal switches to the target satellite, and establishes a communication link with the first terminal through the target satellite.
  • the handover confirmation message also includes: security information for verifying whether the communication link is successfully established.
  • the second terminal determines the information of the target satellite according to the handover request, including: when the handover request includes the ephemeris information of the candidate satellite or when the satellite reselection indication includes the identifier of the candidate satellite, The second terminal determines the information of the target satellite based on the ephemeris information of the candidate satellite; or, when the switching request does not include the ephemeris information of the candidate satellite and the satellite reselection indication is used to indicate reselection of the connected satellite, the second terminal determines the information of the target satellite based on the ephemeris information of each satellite; or, when the switching request does not include the ephemeris information of the candidate satellite and the satellite reselection indication includes the identifier of the target satellite, the second terminal directly determines the information of the target satellite based on the identifier of the target satellite.
  • a terminal which is configured as a first terminal, comprising: a transmitter, used to send a switching request to a second terminal via a source satellite, wherein the switching request comprises: a satellite reselection indication and at least one of ephemeris information of a candidate satellite; a receiver, used to receive a switching confirmation message sent by the second terminal via the source satellite, wherein the switching confirmation message comprises information of a target satellite, and the target satellite is determined by the second terminal according to the switching request; and a controller, used to control the first terminal to switch to the target satellite, and establish a communication link with the second terminal via the target satellite.
  • a terminal which is configured as a second terminal, including: a receiver, used to receive a switching request sent by a first terminal through a source satellite, wherein the switching request includes: a satellite reselection indication and at least one of ephemeris information of a candidate satellite; a controller, used to determine information of a target satellite according to the switching request, and control the second terminal to switch to the target satellite, and establish a communication link with the first terminal through the target satellite; and a transmitter, used to send a switching confirmation message to the first terminal through the source satellite, wherein the switching confirmation message includes information of the target satellite.
  • a communication system including: a first terminal of any of the aforementioned embodiments and a second terminal of any of the aforementioned embodiments.
  • the system further includes: a source satellite, configured to receive a handover request sent by the first terminal and forward the handover request to the second terminal, receive a handover confirmation message sent by the second terminal and forward the handover confirmation message to the first terminal.
  • a source satellite configured to receive a handover request sent by the first terminal and forward the handover request to the second terminal, receive a handover confirmation message sent by the second terminal and forward the handover confirmation message to the first terminal.
  • the source satellite is also used to store the context information of the first terminal and the context information of the second terminal, and before receiving the switching confirmation message sent by the second terminal, when the switching request includes the ephemeris information of the candidate satellite or when the satellite reselection indication includes the identifier of the candidate satellite, the context information of the first terminal and the context information of the second terminal are sent to the candidate satellite; and/or, after receiving the switching confirmation message sent by the second terminal, the context information of the first terminal and the context information of the second terminal are sent to the target satellite, wherein the context information of the first terminal and the context information of the second terminal are used for authorization and authentication of the first terminal and the second terminal during the switching process.
  • the system further includes: a target satellite, configured to establish a connection with the first terminal and the second terminal to form a communication link in response to the switching of the first terminal and the second terminal.
  • a target satellite configured to establish a connection with the first terminal and the second terminal to form a communication link in response to the switching of the first terminal and the second terminal.
  • an electronic device comprising: a processor; and a memory coupled to the processor, for storing instructions, which, when executed by the processor, causes the processor to execute a switching method as in any embodiment of the present disclosure.
  • a computer-readable storage medium on which a computer program is stored, wherein the program, when executed by a processor, implements the switching method of any embodiment of the present disclosure.
  • a computer program comprising: instructions, which, when executed by the processor, cause the processor to execute the switching method as described in any embodiment of the present disclosure.
  • FIG1 is a schematic flow chart of a switching method according to some embodiments of the present disclosure.
  • FIG. 2 is a schematic diagram showing a system architecture of some embodiments of the present disclosure.
  • FIG3 is a schematic flow chart showing a switching method according to other embodiments of the present disclosure.
  • FIG4 shows a schematic structural diagram of a first terminal according to some embodiments of the present disclosure.
  • FIG5 is a schematic structural diagram of a second terminal according to some embodiments of the present disclosure.
  • FIG6 is a schematic diagram showing the structure of a communication system according to some embodiments of the present disclosure.
  • FIG. 7 is a schematic diagram showing the structure of an electronic device according to some embodiments of the present disclosure.
  • FIG. 8 is a schematic structural diagram of an electronic device according to some other embodiments of the present disclosure.
  • terminals need to switch between satellites.
  • Currently there is no solution for how to switch terminals between satellites in the air-ground integration scenario.
  • the switching process may cause a large delay and increase signaling overhead.
  • a technical problem to be solved by the present disclosure is to propose a method for switching in an air-ground integrated scenario to improve switching efficiency and reduce signaling overhead.
  • Fig. 1 is a flow chart of some embodiments of the switching method disclosed in the present invention. As shown in Fig. 1, the method of this embodiment includes: steps S102 to S108.
  • step S102 the first terminal sends a handover request to the second terminal via the source satellite, and correspondingly, the second terminal receives the handover request sent by the first terminal via the source satellite.
  • the first terminal establishes a communication link with the second terminal through the source satellite.
  • a communication link is established between UE (User Equipment, also known as terminal) A and UE B through satellite 1
  • UE C and UE D through satellite 2.
  • the satellite is also connected to the ground network, but the terminals can only exchange signals through the satellite.
  • Satellites can have functions such as storage and forwarding, that is, satellites can have terminal capabilities, which can be called terminal-on-satellite.
  • terminal-on-satellite avoids the requirements for load and processing power brought by base stations and core network functions on satellites, and is more conducive to lightweight deployment and implementation.
  • terminal functions Compared with base stations and core network functions, terminal functions have lower hardware requirements for satellites, and the satellite production cycle is short and the cost is low, which makes it easy to achieve rapid and large-scale deployment.
  • terminal-on-satellite can provide a terminal-satellite-terminal communication method.
  • the terminal-satellite-ground network (-satellite)-terminal communication method requires data to be transmitted through the core network, which increases the transmission delay and radio resource overhead, especially in emergency situations, such as in navigation, exploration and other application scenarios.
  • the terminal-satellite-terminal communication method can reduce the number of signaling interactions with the ground network, reduce radio resource overhead, reduce delay, and improve communication efficiency.
  • terminal-satellite-terminal can ensure that two terminals can communicate directly within the satellite coverage area, greatly improving the geographical range of terminal-to-terminal communication, thereby improving the service quality of the communication network, expanding application cases, and better serving the communication services in remote areas and uninhabited areas.
  • the handover request includes: at least one of a satellite reselection indication and ephemeris information of a candidate satellite.
  • the satellite reselection indication may include at least one of an indicator for indicating the reselection of a connected satellite, an identifier of a target satellite, and an identifier of a candidate satellite.
  • the candidate satellite may be one or more.
  • the ephemeris information of the candidate satellite may include The identification of each candidate satellite and the corresponding ephemeris information.
  • the candidate satellite is determined by the first terminal according to the ephemeris information of each satellite and the connection information between each satellite.
  • the target satellite is determined by the first terminal according to the ephemeris information of each satellite and the connection information between each satellite.
  • the first terminal may also determine the candidate satellite or the target satellite only according to the ephemeris information of each satellite.
  • the first terminal determines one or more satellites covering the location of the first terminal within a preset time period in the future according to the ephemeris information of each satellite, determines whether the one or more satellites are connected to the source satellite according to the connection information between the satellites, and selects one or more satellites connected to the source satellite as candidate satellites, or selects a satellite connected to the source satellite as a target satellite.
  • the connection information between satellites can be represented by an intersatellite link or an intersatellite connection matrix.
  • the first terminal can learn about changes in satellite coverage areas through ephemeris information and connection information between satellites, decide whether to perform satellite switching, and determine candidate satellites or target satellites.
  • step S104 the second terminal determines information of the target satellite according to the handover request.
  • the second terminal determines the target satellite according to the ephemeris information of the candidate satellite.
  • the second terminal determines the target satellite according to the ephemeris information of each satellite.
  • the second terminal when the handover request does not include ephemeris information of the candidate satellite and the satellite reselection indication includes an identifier of the target satellite, the second terminal directly determines the target satellite according to the identifier of the target satellite.
  • the second terminal can obtain the ephemeris information of the candidate satellite and determine the target satellite according to the ephemeris information of the candidate satellite. For example, the second terminal determines the target satellite that covers the location of the second terminal in a preset time period in the future according to the ephemeris information of each candidate satellite, and the second terminal can also determine whether the target satellite is connected to the source satellite according to the connection information between each satellite. If the target satellite is not connected to the source satellite, the target satellite can be reselected.
  • the first terminal can select a candidate satellite and send the ephemeris information of the candidate satellite to the second terminal, and the second terminal selects the target satellite, so that the selected target satellite can accurately cover both terminals, and the process of the second terminal obtaining the ephemeris information can be reduced, thereby improving efficiency.
  • the second terminal may determine a target satellite based on ephemeris information of each satellite, or based on ephemeris information of each satellite and connection information between each satellite.
  • the second terminal may directly determine the target satellite.
  • the second terminal may determine whether the target satellite covers the position of the second terminal in a future preset time period based on the ephemeris information of the target satellite. If the target satellite cannot cover the position of the second terminal in a future preset time period, the second terminal may return a handover response to the first terminal, and the handover response carries indication information that the target terminal is not suitable.
  • step S106 the second terminal sends a switching confirmation message to the first terminal via the source satellite, and correspondingly, the first terminal receives the switching confirmation message sent by the second terminal via the source satellite.
  • the second terminal sends a handover confirmation message to the source satellite and then to the first terminal.
  • the handover confirmation message includes information of the target satellite, such as an identifier of the target satellite.
  • the handover confirmation message also includes: security information for verifying whether the communication link is successfully established.
  • step S108 the first terminal switches to the target satellite and establishes a communication link with the second terminal through the target satellite.
  • the second terminal switches to the target satellite and establishes a communication link with the first terminal through the target satellite.
  • a new communication method in which a communication link is established between the first terminal and the second terminal through a satellite, and the first terminal and the second terminal can communicate directly through the satellite.
  • the first terminal sends a switching request to the second terminal through the source satellite, and the switching request includes: at least one of a satellite reselection indication and the ephemeris information of the candidate satellite.
  • the second terminal determines the target satellite according to the switching request, and sends a switching confirmation message to the first terminal carrying the information of the target satellite, and then the first terminal and the second terminal are both switched to the target satellite, and the first terminal establishes a communication link between the target satellite and the second terminal.
  • the scheme of the above embodiment realizes the switching of terminals between satellites in the air-ground integration scenario, and the terminals interact with each other through satellites, thereby improving the switching efficiency and reducing the signaling overhead.
  • Fig. 3 is a flow chart of some other embodiments of the switching method disclosed in the present invention. As shown in Fig. 3, the method of this embodiment includes: steps S302 to S316.
  • step S302 the first terminal establishes a connection with the source satellite and establishes a communication link with the second terminal through the source satellite.
  • the second terminal establishes a connection with the source satellite and establishes a communication link with the first terminal through the source satellite.
  • the first terminal establishes a communication link between the source satellite and the second terminal. After the first terminal is connected to the source satellite The satellite ephemeris information and/or the connection information between satellites can also be obtained from the ground network (eg core network). The service authorization and pre-configuration of the first terminal and the second terminal are completed before the first terminal-source satellite-second terminal connection is established.
  • the ground network eg core network
  • step S304 the first terminal determines whether to perform satellite switching according to the ephemeris information of each satellite and the connection information between each satellite. If it is determined to perform satellite switching, step S306 is executed.
  • step S306 the first terminal sends a handover request to the second terminal via the source satellite.
  • the switching request includes at least one of: a satellite reselection indication and ephemeris information of a candidate satellite.
  • step S308 when the handover request includes ephemeris information of the candidate satellite or when the satellite reselection indication includes an identifier of the candidate satellite, the source satellite sends the stored context information of the first terminal and the context information of the second terminal to the candidate satellite.
  • the source satellite may store the context information of the first terminal and the context information of the second terminal. If the handover request includes information of the candidate satellite, the source satellite may send the stored context information of the first terminal and the context information of the second terminal to the candidate satellite.
  • the context information of the first terminal and the context information of the second terminal are used for authorization and authentication of the first terminal and the second terminal during the handover process.
  • the source satellite can send context information about the first terminal and the second terminal to the candidate satellite according to the satellite reselection instruction.
  • the candidate satellite stores the resources and context of the first terminal and the second terminal, thereby assisting the candidate satellite in authorizing access to the first terminal and the second terminal.
  • step S310 the second terminal determines information of the target satellite according to the handover request.
  • step S312 the second terminal sends a handover confirmation message to the first terminal via the source satellite.
  • the handover confirmation message includes the information of the target satellite.
  • step S314 the source satellite sends the stored context information of the first terminal and the stored context information of the second terminal to the target satellite.
  • step S314 does not need to be performed.
  • step S316 the first terminal and the second terminal switch to the target satellite, and the first terminal establishes a communication link with the second terminal through the target satellite.
  • step S308 or S314 the link establishment between the first terminal and the target satellite, and the target satellite and the second terminal can be simplified, and the target satellite can complete the relevant authorization and authentication of the first terminal and the second terminal based on the stored context information. If steps S308 and S314 are not executed, a new target satellite needs to be reselected and established. The communication link between the satellite and the two terminals.
  • the solution disclosed in the present invention is aimed at the integrated air-space-ground communication network scenario. Due to the mobility of satellites, the network topology is highly dynamic and there is a problem of weak coverage in some areas. Long-distance communication is achieved by equipping satellites with terminal capabilities (such as storage and forwarding functions), and a mobility switching method is proposed to solve the high dynamics of the network topology, so as to better serve remote areas and uninhabited areas.
  • the scheme disclosed in the present invention utilizes the regularity and predictability of the constellation operation of the intersatellite network, and the relatively fixed intersatellite topology, and assists in solving the satellite mobility switching by obtaining the satellite ephemeris information.
  • the ground terminal determines the target satellite for switching through the ephemeris information and the connection information between satellites.
  • the mobility switching method based on the terminal on the satellite proposed in the present invention can transmit the terminal information between satellites through the intersatellite link, and store the terminal context information for subsequent auxiliary satellite access authorization to the terminal, etc., to improve the switching efficiency.
  • the present disclosure also provides a terminal, which is configured as a first terminal, and is described below in conjunction with FIG. 4 .
  • FIG4 is a structural diagram of some embodiments of the first terminal of the present disclosure.
  • the first terminal 40 of this embodiment includes: a transmitter 410 , a receiver 420 , and a controller 430 .
  • the transmitter 410 is used to send a switching request to the second terminal via the source satellite, wherein the switching request includes at least one of a satellite reselection indication and ephemeris information of a candidate satellite.
  • the receiver 420 is used to receive a switching confirmation message sent by the second terminal via the source satellite, wherein the switching confirmation message includes information of the target satellite, and the target satellite is determined by the second terminal according to the switching request.
  • the controller 430 is used to control the first terminal to switch to the target satellite and establish a communication link with the second terminal through the target satellite.
  • the controller 430 is also used to determine whether to perform satellite switching based on the ephemeris information of each satellite and the connection information between each satellite; when it is determined to perform satellite switching, the transmitter 410 is triggered to send a switching request to the second terminal via the source satellite.
  • the candidate satellites are determined by the first terminal according to ephemeris information of each satellite and connection information between each satellite.
  • the handover confirmation message also includes: security information for verifying whether the communication link is successfully established.
  • the target satellite when the handover request includes ephemeris information of the candidate satellite or when the satellite reselection indication includes the identifier of the candidate satellite, the target satellite is determined by the second terminal according to the ephemeris information of the candidate satellite; or, when the handover request does not include the ephemeris information of the candidate satellite and the satellite reselection indication is used to indicate reselection of the connected satellite, the target satellite is determined by the second terminal according to the ephemeris information of each satellite; or, In a case where the handover request does not include the ephemeris information of the candidate satellite and the satellite reselection indication includes the identifier of the target satellite, the target satellite is determined by the second terminal directly according to the identifier of the target satellite.
  • the controller 430 is further configured to control the first terminal to establish a connection with the source satellite, and to establish a communication link with the second terminal through the source satellite.
  • the present disclosure also provides a second terminal, which is described below in conjunction with FIG. 5 .
  • FIG5 is a structural diagram of some embodiments of the second terminal of the present disclosure.
  • the second terminal 50 of this embodiment includes: a receiver 510, a controller 520, and a transmitter 530.
  • the receiver 510 is configured to receive a switching request sent by the first terminal via a source satellite, wherein the switching request includes at least one of a satellite reselection indication and ephemeris information of a candidate satellite.
  • the controller 520 is used to determine the information of the target satellite according to the switching request, and control the second terminal to switch to the target satellite, and establish a communication link with the first terminal through the target satellite.
  • the transmitter 530 is configured to send a switching confirmation message to the first terminal via the source satellite, wherein the switching confirmation message includes information of the target satellite.
  • the handover confirmation message also includes: security information for verifying whether the communication link is successfully established.
  • the controller 520 is used to determine the information of the target satellite based on the ephemeris information of the candidate satellite when the switching request includes the ephemeris information of the candidate satellite or when the satellite reselection indication includes the identification of the candidate satellite; or, when the switching request does not include the ephemeris information of the candidate satellite and the satellite reselection indication is used to indicate reselection of the connected satellite, determine the information of the target satellite based on the ephemeris information of each satellite; or, when the switching request does not include the ephemeris information of the candidate satellite and the satellite reselection indication includes the identification of the target satellite, directly determine the information of the target satellite based on the identification of the target satellite.
  • the transmitter, receiver and controller in the first terminal and the transmitter, receiver and controller in the second terminal may be integrated into one terminal to implement corresponding functions.
  • the present disclosure also provides a communication system, which will be described below in conjunction with FIG. 6 .
  • FIG6 is a structural diagram of some embodiments of the communication system of the present disclosure. As shown in FIG6 , the system 6 of this embodiment includes: a first terminal 40 and a second terminal 50 .
  • the system 6 further includes a source satellite 62 for receiving a switching request sent by the first terminal 40 and forwarding it to the second terminal 50 , and receiving a switching confirmation message sent by the second terminal 50 and forwarding it to the first terminal 40 .
  • the source satellite 62 is further configured to store the context information of the first terminal 40 and the context information of the second terminal 50.
  • the context information of the first terminal 40 and the context information of the second terminal 50 are sent to the candidate satellite; or, after receiving the switching confirmation message sent by the second terminal 50, the context information of the first terminal 40 and the context information of the second terminal 50 are sent to the target satellite, wherein the context information of the first terminal 40 and the context information of the second terminal 50 are used for authorization and authentication of the first terminal 40 and the second terminal 50 during the switching process.
  • the system 6 further includes a target satellite 64, which is used to establish a connection with the first terminal 40 and the second terminal 50 to form a communication link in response to the switching of the first terminal 40 and the second terminal 50.
  • the target satellite 64 is also used to receive the context information of the first terminal 40 and the context information of the second terminal 50 sent by the source satellite 62, and authorize and authenticate the first terminal 40 and the second terminal 50.
  • the system 6 may include multiple satellites and multiple terminals, any terminal may be used as the first terminal or the second terminal, and any satellite may be used as the source satellite or the target satellite.
  • the electronic devices in the embodiments of the present disclosure may be implemented by various computing devices or computer systems, which will be described below in conjunction with FIG. 7 and FIG. 8 .
  • Fig. 7 is a structural diagram of some embodiments of the electronic device of the present disclosure.
  • the electronic device 70 of this embodiment includes: a memory 710 and a processor 720 coupled to the memory 710, and the processor 720 is configured to execute the switching method in any of the embodiments of the present disclosure based on the instructions stored in the memory 710.
  • the memory 710 may include, for example, a system memory, a fixed non-volatile storage medium, etc.
  • the system memory may store, for example, an operating system, an application program, a boot loader, a database, and other programs.
  • FIG8 is a block diagram of some other embodiments of the electronic device disclosed in the present invention.
  • the electronic device 80 of this embodiment includes: a memory 810 and a processor 820, which are similar to the memory 710 and the processor 720, respectively. It may also include an input-output interface 830, a network interface 840, a storage interface 850, and the like. These interfaces 830, 840, 850 and the memory 810 and the processor 820 may be connected, for example, via a bus 860.
  • the input-output interface 830 provides a connection interface for input-output devices such as a display, a mouse, a keyboard, and a touch screen.
  • the network interface 840 provides a connection interface for various networked devices, for example, it can be connected to a database server or a cloud storage server, and the like.
  • the storage interface 850 provides a connection interface for external storage devices such as SD cards and USB flash drives.
  • the embodiments of the present disclosure may be provided as methods, systems, or computer program products. Therefore, the present disclosure may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product that includes one or more of the following:
  • the computer program product of the serial code can be implemented on a non-transitory storage medium (including but not limited to disk storage, CD-ROM, optical storage, etc.).
  • These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device that implements the functions specified in one or more processes in the flowchart and/or one or more boxes in the block diagram.
  • These computer program instructions may also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and/or one or more boxes in the block diagram.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

本公开涉及一种切换方法、终端、通信系统以及电子设备，涉及通信技术领域。本公开的方法包括：第一终端通过源卫星向第二终端发送切换请求，其中，第一终端通过源卫星和第二终端之间建立通信链路，切换请求包括卫星重新选择指示和候选卫星的星历信息中至少一项；第一终端接收第二终端通过源卫星发送的切换确认消息，其中，切换确认消息包括目标卫星的信息，目标卫星是第二终端根据切换请求确定的；第一终端切换到目标卫星，通过目标卫星和第二终端建立通信链路。

Description

切换方法、终端、通信系统以及电子设备
相关申请的交叉引用
本申请是以CN申请号为202310790659.0，申请日为2023年6月29日的申请为基础，并主张其优先权，该CN申请的公开内容在此作为整体引入本申请中。
技术领域
本公开涉及通信技术领域，特别涉及一种切换方法、终端、通信系统以及电子设备。
背景技术
目前3GPP(3rd Generation Partnership Project，第三代合作伙伴计划)或者学术界针对空天地一体化场景展开了相关研究。卫星在各个架构中逐步具备了基站或者核心网的部分功能。
目前，在空天地一体化场景中，终端与终端之间进行通信还需要经过地面网络，即终端设备与另外一台终端设备通信通常通过终端-卫星-地面网(-卫星)-终端的路径进行通信。
发明内容
根据本公开的一些实施例，提供的一种切换方法，包括：第一终端通过源卫星向第二终端发送切换请求，其中，第一终端通过源卫星和第二终端之间建立通信链路，切换请求包括卫星重新选择指示和候选卫星的星历信息中至少一项；第一终端接收第二终端通过源卫星发送的切换确认消息，其中，切换确认消息包括目标卫星的信息，目标卫星是第二终端根据切换请求确定的；第一终端切换到目标卫星，通过目标卫星和第二终端建立通信链路。
在一些实施例中，该方法还包括：第一终端根据各个卫星的星历信息和各个卫星之间的连接信息，确定是否执行卫星切换；其中，第一终端通过源卫星向第二终端发送切换请求包括：第一终端在确定执行卫星切换的情况下，通过源卫星向第二终端发送切换请求。
在一些实施例中，候选卫星是第一终端根据各个卫星的星历信息和各个卫星之间 的连接信息确定的。
在一些实施例中，切换确认消息还包括：安全信息，用于验证通信链路建立是否成功。
在一些实施例中，在切换请求包括候选卫星的星历信息或者在卫星重新选择指示包括候选卫星的标识的情况下，目标卫星是第二终端根据候选卫星的星历信息确定的；或者，在切换请求未包括候选卫星的星历信息且卫星重新选择指示用于指示重新选择连接的卫星的情况下，目标卫星是第二终端根据各个卫星的星历信息确定的；或者，在切换请求未包括候选卫星的星历信息且卫星重新选择指示包括目标卫星的标识的情况下，目标卫星是第二终端直接根据目标卫星的标识确定的。
在一些实施例中，该方法还包括：第一终端与源卫星建立连接，并通过源卫星与第二终端建立通信链路。
在一些实施例中，该方法还包括：在第一终端接收第二终端通过源卫星发送的切换确认消息之前，在切换请求包括候选卫星的星历信息或者在卫星重新选择指示包括候选卫星的标识的情况下，源卫星向候选卫星发送存储的第一终端的上下文信息和第二终端的上下文信息，其中，第一终端的上下文信息和第二终端的上下文信息用于切换过程中第一终端和第二终端的授权和认证。
在一些实施例中，该方法还包括：在第一终端接收第二终端通过源卫星发送的切换确认消息之后，源卫星向目标卫星发送存储的第一终端的上下文信息和第二终端的上下文信息，其中，第一终端的上下文信息和第二终端的上下文信息用于切换过程中第一终端和第二终端的授权和认证。
根据本公开的另一些实施例，提供的一种切换方法，包括：第二终端通过源卫星接收第一终端发送的切换请求，其中，第一终端通过源卫星和第二终端之间建立通信链路，切换请求包括：卫星重新选择指示和候选卫星的星历信息中至少一项；第二终端根据切换请求确定目标卫星的信息；第二终端通过源卫星向第一终端发送切换确认消息，其中，切换确认消息包括目标卫星的信息；第二终端切换到目标卫星，通过目标卫星和第一终端建立通信链路。
在一些实施例中，切换确认消息还包括：安全信息，用于验证通信链路建立是否成功。
在一些实施例中，第二终端根据切换请求确定目标卫星的信息包括：在切换请求包括候选卫星的星历信息或者在卫星重新选择指示包括候选卫星的标识的情况下，第 二终端根据候选卫星的星历信息确定目标卫星的信息；或者，在切换请求未包括候选卫星的星历信息且卫星重新选择指示用于指示重新选择连接的卫星的情况下，第二终端根据各个卫星的星历信息确定目标卫星的信息；或者，在切换请求未包括候选卫星的星历信息且卫星重新选择指示包括目标卫星的标识的情况下，第二终端直接根据目标卫星的标识确定目标卫星的信息。
根据本公开的又一些实施例，提供的一种终端，被配置为第一终端，包括：发送器，用于通过源卫星向第二终端发送切换请求，其中，切换请求包括：卫星重新选择指示和候选卫星的星历信息中至少一项；接收器，用于接收第二终端通过源卫星发送的切换确认消息，其中，切换确认消息包括目标卫星的信息，目标卫星是第二终端根据切换请求确定的；控制器，用于控制第一终端切换到目标卫星，通过目标卫星与第二终端建立通信链路。
根据本公开的再一些实施例，提供的一种终端，被配置为第二终端，包括：接收器，用于通过源卫星接收第一终端发送的切换请求，其中，切换请求包括：卫星重新选择指示和候选卫星的星历信息中至少一项；控制器，用于根据切换请求确定目标卫星的信息，并控制第二终端切换到目标卫星，通过目标卫星与第一终端建立通信链路；发送器，用于通过源卫星向第一终端发送切换确认消息，其中，切换确认消息包括目标卫星的信息。
根据本公开的又一些实施例，提供的一种通信系统，包括：前述任意实施例的第一终端和前述任意实施例的第二终端。
在一些实施例中，该系统还包括：源卫星，用于接收第一终端发送的切换请求，并转发至第二终端，接收第二终端发送的切换确认消息，并转发至第一终端。
在一些实施例中，源卫星还用于存储第一终端的上下文信息和第二终端的上下文信息，在接收第二终端发送的切换确认消息之前，在切换请求包括候选卫星的星历信息或者在卫星重新选择指示包括候选卫星的标识的情况下，向候选卫星发送第一终端的上下文信息和第二终端的上下文信息；和/或，在接收述第二终端发送的切换确认消息之后，向目标卫星发送第一终端的上下文信息和第二终端的上下文信息，其中，第一终端的上下文信息和第二终端的上下文信息用于切换过程中第一终端和第二终端的授权和认证。
在一些实施例中，该系统还包括：目标卫星，用于响应于第一终端和第二终端的切换，与第一终端和第二终端建立连接，形成通信链路。
根据本公开的再一些实施例，提供的一种电子设备，包括：处理器；以及耦接至处理器的存储器，用于存储指令，指令被处理器执行时，使处理器执行如本公开任意实施例的切换方法。
根据本公开的又一些实施例，提供的一种计算机可读存储介质，其上存储有计算机程序，其中，该程序被处理器执行时实现本公开任意实施例的切换方法。
根据本公开的再一些实施例，提供的一种计算机程序，包括：指令，所述指令被所述处理器执行时，使所述处理器执行如本公开任意实施例的所述的切换方法。
通过以下参照附图对本公开的示例性实施例的详细描述，本公开的其它特征及其优点将会变得清楚。
附图说明
为了更清楚地说明本公开实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本公开的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1示出本公开的一些实施例的切换方法的流程示意图。
图2示出本公开的一些实施例的系统架构的示意图。
图3示出本公开的另一些实施例的切换方法的流程示意图。
图4示出本公开的一些实施例的第一终端的结构示意图。
图5示出本公开的一些实施例的第二终端的结构示意图。
图6示出本公开的一些实施例的通信系统的结构示意图。
图7示出本公开的一些实施例的电子设备的结构示意图。
图8示出本公开的另一些实施例的电子设备的结构示意图。
具体实施方式
下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本公开一部分实施例，而不是全部的实施例。以下对至少一个示例性实施例的描述实际上仅仅是说明性的，决不作为对本公开及其应用或使用的任何限制。基于本公开中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。
发明人发现：由于卫星的移动性，终端需要在卫星之间进行切换，目前针对空天地一体化场景，如何实现终端在卫星之间切换还没有相关方案。此外，针对目前终端与终端之间进行通信还需要经过地面网络的情况，切换过程可能会导致较大的时延，并且增加了信令开销。
本公开所要解决的一个技术问题是：提出一种空天地一体化场景中，进行切换的方法，提高切换效率，减少信令开销。
针对空天地一体化场景，提出一种切换方法，下面结合图1～3进行描述。
图1为本公开切换方法一些实施例的流程图。如图1所示，该实施例的方法包括：步骤S102～S108。
在步骤S102中，第一终端通过源卫星向第二终端发送切换请求，相应的，第二终端通过源卫星接收第一终端发送的切换请求。
第一终端通过源卫星和第二终端之间建立通信链路。如图2所示，UE(User Equipment，用户设备，也可以称为终端)A和UE B之间通过卫星1建立通信链路，UE C和UE D之间通过卫星2建立通信链路。卫星还连接地面网，但是终端之间仅通过卫星就可以进行信令交互。
卫星可以具备存储、转发等功能，即卫星可以具备终端能力，可以称为终端上星。一方面，终端上星避免了基站、核心网功能上星带来载荷、处理能力的要求，更利于轻量化部署和实现。相较于基站、核心网功能，终端功能对卫星的硬件要求较低，卫星制作的周期短，成本低，容易实现快速和大规模部署。另一方面，终端上星能提供终端-卫星-终端的通信方式。终端-卫星-地面网(-卫星)-终端的通信方式，需通过核心网传递数据，加大了传输时延和无线电资源的开销，特别是在紧急情况下，比如航海、探险等应用场景下。终端-卫星-终端的通信方式可以减少与地面网信令交互次数，减少无线电资源开销，降低时延，提高通信效率。此外相比于传统的终端-终端的通信方式，终端-卫星-终端能保证两个终端在卫星覆盖范围之内能直接通信，大大提高了终端-终端通信的地理范围，以此来提升通信网络的服务质量，扩展应用案例，更好的服务于偏远地区和无人区域的通信服务。
第一终端现将切换请求发送至源卫星，再由源卫星转发至第二终端。在一些实施例中，切换请求包括：卫星重新选择指示和候选卫星的星历信息中至少一项。卫星重新选择指示可以包括用于指示重新选择连接的卫星的指示符、目标卫星的标识和候选卫星的标识中至少一项。候选卫星可以为一个或多个。候选卫星的星历信息可以包括 各个候选卫星的标识和对应的星历信息。
在一些实施例中，候选卫星是第一终端根据各个卫星的星历信息和各个卫星之间的连接信息确定的。或者，在卫星重新选择指示中包括目标卫星的标识的情况下，目标卫星是第一终端根据各个卫星的星历信息和各个卫星之间的连接信息确定的。第一终端也可以仅根据各个卫星的星历信息确定候选卫星或目标卫星。
例如，第一终端根据各个卫星的星历信息确定在未来预设时间段内覆盖第一终端所处的位置的一个或多个卫星，根据各个卫星之间的连接信息确定该一个或多个卫星是否与源卫星连接，从中选取与源卫星连接的一个或多个卫星作为候选卫星，或者从中选取与源卫星连接的一个卫星作为目标卫星。卫星之间的连接信息可以用星间链或星间连接矩阵等表示。
第一终端通过星历信息以及各个卫星之间的连接信息，能够得知卫星覆盖区域变化，决定是否执行卫星切换并确定候选卫星或目标卫星。
在步骤S104中，第二终端根据切换请求确定目标卫星的信息。
在一些实施例中，在切换请求包括候选卫星的星历信息或者在卫星重新选择指示包括候选卫星的标识的情况下，第二终端根据候选卫星的星历信息确定目标卫星。
在一些实施例中，在切换请求未包括候选卫星的星历信息且卫星重新选择指示用于指示重新选择连接的卫星的情况下，第二终端根据各个卫星的星历信息确定目标卫星。
在一些实施例中，在切换请求未包括候选卫星的星历信息且卫星重新选择指示包括目标卫星的标识的情况下，第二终端直接根据目标卫星的标识确定目标卫星。
如果切换请求中仅包括候选卫星的星历信息或者仅包括卫星重新选择指示且卫星重新选择指示包括候选卫星的标识，第二终端可以获取到候选卫星的星历信息，并根据候选卫星的星历信息确定目标卫星。例如，第二终端根据各个候选卫星的星历信息确定在未来预设时间段内覆盖第二终端所处的位置的目标卫星，第二终端还可以根据各个卫星之间的连接信息确定目标卫星是否与源卫星连接。如果目标卫星未与源卫星连接，可以重新选取目标卫星。
第一终端可以选取候选卫星，并将候选卫星的星历信息发送至第二终端，由第二终端选取目标卫星，可以使得选取的目标卫星都能准确覆盖两个终端，并且可以减少第二终端获取星历信息的过程，提高效率。
如果切换请求中仅包括卫星重新选择指示且卫星重新选择指示仅用于指示重新 选择连接的卫星，第二终端可以根据各个卫星的星历信息，或根据各个卫星的星历信息和各个卫星之间的连接信息，确定目标卫星。
如果切换请求中仅包括卫星重新选择指示且卫星重新选择指示包括目标卫星的标识，第二终端可以直接确定目标卫星。第二终端可以根据目标卫星的星历信息确定在未来预设时间段内目标卫星是否覆盖第二终端的位置。如果在未来预设时间段内目标卫星无法覆盖第二终端的位置，第二终端可以向第一终端返回切换响应，切换响应中携带目标终端不合适的指示信息。
在步骤S106中，第二终端通过源卫星向第一终端发送切换确认消息，相应的，第一终端接收第二终端通过源卫星发送的切换确认消息。
一旦决定切换，第二终端向源卫星并进而向第一终端发送切换确认消息，切换确认消息包括目标卫星的信息，例如，目标卫星的标识等。
在一些实施例中，切换确认消息还包括：安全信息，用于验证通信链路建立是否成功。
在步骤S108中，第一终端切换到目标卫星，通过目标卫星和第二终端建立通信链路，相应的，第二终端切换到目标卫星，通过目标卫星和第一终端建立通信链路。
上述实施例中提出了一种新的通信方式，第一终端通过卫星和第二终端之间建立通信链路，第一终端和第二终端可以直接通过卫星进行通信。第一终端通过源卫星向第二终端发送切换请求，切换请求包括：卫星重新选择指示和候选卫星的星历信息中至少一项，第二终端根据切换请求确定目标卫星，并向第一终端发送切换确认消息携带目标卫星的信息，进而第一终端和第二终端都切换至目标卫星，第一终端通过目标卫星和第二终端之间建立通信链路。上述实施例的方案实现了空天地一体化场景中终端在卫星之间进行切换，并且终端之间通过卫星进行信令交互，提高切换效率，减少信令开销。
下面结合图3描述本公开切换方法的另一些实施例。
图3为本公开切换方法另一些实施例的流程图。如图3所示，该实施例的方法包括：步骤S302～S316。
在步骤S302中，第一终端与源卫星建立连接，并通过源卫星与第二终端建立通信链路，相应的，第二终端与源卫星建立连接，并通过源卫星与第一终端建立通信链路。
第一终端通过源卫星和第二终端之间建立通信链路。第一终端连接到源卫星之后 还可以从地面网(例如核心网)获取到卫星的星历信息和/或卫星之间的连接信息。在第一终端-源卫星-第二终端连接建立前已完成第一终端和第二终端的服务授权和预配置等。
在步骤S304中，第一终端根据各个卫星的星历信息和各个卫星之间的连接信息，确定是否执行卫星切换，如果确定执行卫星切换，则执行步骤S306。
在步骤S306，第一终端通过源卫星向第二终端发送切换请求。
切换请求包括：卫星重新选择指示和候选卫星的星历信息中至少一项。
可选的，在步骤S308，在切换请求包括候选卫星的星历信息或者在卫星重新选择指示包括候选卫星的标识的情况下，源卫星向候选卫星发送存储的第一终端的上下文信息和第二终端的上下文信息。
源卫星可以存储第一终端的上下文信息和第二终端的上下文信息。如果切换请求中包含候选卫星的信息，则源卫星可以向候选卫星发送存储的第一终端的上下文信息和第二终端的上下文信息。第一终端的上下文信息和第二终端的上下文信息用于切换过程中第一终端和第二终端的授权和认证。
源卫星与候选卫星之间存在星间链，故源卫星在收到第一终端发来的切换请求后，按照卫星重新选择指示，可以向候选卫星发送关于第一终端和第二终端的上下文信息等，候选卫星存储第一终端和第二终端的资源与上下文，从而辅助候选卫星对第一终端和第二终端的接入授权等。
在步骤S310中，第二终端根据切换请求确定目标卫星的信息。
在步骤S312中，第二终端通过源卫星向第一终端发送切换确认消息。
切换确认消息包括目标卫星的信息。
可选的，在步骤S314中，源卫星向目标卫星发送存储的第一终端的上下文信息和第二终端的上下文信息。
如果源卫星已经向候选卫星发送了第一终端的上下文信息和第二终端的上下文信息，则不需要执行步骤S314。
在步骤S316中，第一终端和第二终端切换到目标卫星，第一终端通过目标卫星和第二终端建立通信链路。
如果执行步骤S308或S314，对于第一终端-目标卫星，目标卫星-第二终端之间的链路建立就可以简化，目标卫星可以基于存储的上下文信息完成对第一终端和第二终端的相关授权与认证等。如果步骤S308和S314未执行，需要重选建立新的目标卫 星与两个终端之间的通信链路。
本公开的方案针对空天地一体化通信网络场景，由于卫星的移动性，网络拓扑结构具有高动态性的特征，存在部分覆盖薄弱的问题，通过让卫星具备终端能力(比如存储转发功能)实现长距离通信，并提出移动性切换方法来解决网络拓扑的高动态性，更好的服务于偏远地区和无人区域。
本公开的方案利用星间网络的星座运行具有规律性和可预测性，星间拓扑比较固定，通过获取到卫星星历信息来辅助解决卫星移动性切换。地面终端通过星历信息以及卫星间的连接信息决定切换的目标卫星。本公开提出的基于终端上星的移动性切换方法，卫星之间可以通过星间链路传输终端信息，并将终端上下文信息进行存储，用于后续辅助卫星对终端的接入授权等，提高切换效率。
本公开还提供一种终端，被配置为第一终端，下面结合图4进行描述。
图4为本公开第一终端的一些实施例的结构图。如图4所示，该实施例的第一终端40包括：发送器410，接收器420，控制器430。
发送器410用于通过源卫星向第二终端发送切换请求，其中，切换请求包括：卫星重新选择指示和候选卫星的星历信息中至少一项。
接收器420用于接收第二终端通过源卫星发送的切换确认消息，其中，切换确认消息包括目标卫星的信息，目标卫星是第二终端根据切换请求确定的。
控制器430用于控制第一终端切换到目标卫星，通过目标卫星与第二终端建立通信链路。
在一些实施例中，控制器430还用于根据各个卫星的星历信息和各个卫星之间的连接信息，确定是否执行卫星切换；在确定执行卫星切换的情况下，触发发送器410通过源卫星向第二终端发送切换请求。
在一些实施例中，候选卫星是第一终端根据各个卫星的星历信息和各个卫星之间的连接信息确定的。
在一些实施例中，切换确认消息还包括：安全信息，用于验证通信链路建立是否成功。
在一些实施例中，在切换请求包括候选卫星的星历信息或者在卫星重新选择指示包括候选卫星的标识的情况下，目标卫星是第二终端根据候选卫星的星历信息确定的；或者，在切换请求未包括候选卫星的星历信息且卫星重新选择指示用于指示重新选择连接的卫星的情况下，目标卫星是第二终端根据各个卫星的星历信息确定的；或者， 在切换请求未包括候选卫星的星历信息且卫星重新选择指示包括目标卫星的标识的情况下，目标卫星是第二终端直接根据目标卫星的标识确定的。
在一些实施例中，控制器430还用于控制第一终端与源卫星建立连接，并通过源卫星与第二终端建立通信链路。
本公开还提供一种第二终端，下面结合图5进行描述。
图5为本公开第二终端的一些实施例的结构图。如图5所示，该实施例的第二终端50包括：接收器510，控制器520，发送器530.
接收器510，用于通过源卫星接收第一终端发送的切换请求，其中，切换请求包括：卫星重新选择指示和候选卫星的星历信息中至少一项。
控制器520，用于根据切换请求确定目标卫星的信息，并控制第二终端切换到目标卫星，通过目标卫星与第一终端建立通信链路。
发送器530，用于通过源卫星向第一终端发送切换确认消息，其中，切换确认消息包括目标卫星的信息。
在一些实施例中，切换确认消息还包括：安全信息，用于验证通信链路建立是否成功。
在一些实施例中，控制器520用于在切换请求包括候选卫星的星历信息或者在卫星重新选择指示包括候选卫星的标识的情况下，根据候选卫星的星历信息确定目标卫星的信息；或者，在切换请求未包括候选卫星的星历信息且卫星重新选择指示用于指示重新选择连接的卫星的情况下，根据各个卫星的星历信息确定目标卫星的信息；或者，在切换请求未包括候选卫星的星历信息且卫星重新选择指示包括目标卫星的标识的情况下，直接根据目标卫星的标识确定目标卫星的信息。
第一终端中发送器、接收器和控制器可以和第二终端中的发送器、接收器和控制器可以集成于一个终端中，实现相应的功能。
本公开还提供一种通信系统，下面结合图6进行描述。
图6为本公开通信系统的一些实施例的结构图。如图6所示，该实施例的系统6包括：第一终端40和第二终端50。
在一些实施例中，系统6还包括源卫星62，用于接收第一终端40发送的切换请求，并转发至第二终端50，接收第二终端50发送的切换确认消息，并转发至第一终端40。
在一些实施例中，源卫星62还用于存储第一终端40的上下文信息和第二终端50 的上下文信息，在接收第二终端50发送的切换确认消息之前，在切换请求包括候选卫星的星历信息或者在卫星重新选择指示包括候选卫星的标识的情况下，向候选卫星发送第一终端40的上下文信息和第二终端50的上下文信息；或者，在接收述第二终端50发送的切换确认消息之后，向目标卫星发送第一终端40的上下文信息和第二终端50的上下文信息，其中，第一终端40的上下文信息和第二终端50的上下文信息用于切换过程中第一终端40和第二终端50的授权和认证。
在一些实施例中，系统6还包括目标卫星64，用于响应于第一终端40和第二终端50的切换，与第一终端40和第二终端50建立连接，形成通信链路。目标卫星64还用于接收源卫星62发送的第一终端40的上下文信息和第二终端50的上下文信息，对第一终端40和第二终端50进行授权和认证。
系统6中可以包括多个卫星和多个终端，任意终端可以作为第一终端或第二终端，任意卫星可以作为源卫星或目标卫星。
本公开的实施例中的电子设备(第一终端、第二终端、卫星等)可各由各种计算设备或计算机系统来实现，下面结合图7以及图8进行描述。
图7为本公开电子设备的一些实施例的结构图。如图7所示，该实施例的电子设备70包括：存储器710以及耦接至该存储器710的处理器720，处理器720被配置为基于存储在存储器710中的指令，执行本公开中任意一些实施例中的切换方法。
其中，存储器710例如可以包括系统存储器、固定非易失性存储介质等。系统存储器例如存储有操作系统、应用程序、引导装载程序(Boot Loader)、数据库以及其他程序等。
图8为本公开电子设备的另一些实施例的结构图。如图8所示，该实施例的电子设备80包括：存储器810以及处理器820，分别与存储器710以及处理器720类似。还可以包括输入输出接口830、网络接口840、存储接口850等。这些接口830，840，850以及存储器810和处理器820之间例如可以通过总线860连接。其中，输入输出接口830为显示器、鼠标、键盘、触摸屏等输入输出设备提供连接接口。网络接口840为各种联网设备提供连接接口，例如可以连接到数据库服务器或者云端存储服务器等。存储接口850为SD卡、U盘等外置存储设备提供连接接口。
本领域内的技术人员应当明白，本公开的实施例可提供为方法、系统、或计算机程序产品。因此，本公开可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本公开可采用在一个或多个其中包含有计算机可用程 序代码的计算机可用非瞬时性存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本公开是参照根据本公开实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解为可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
以上所述仅为本公开的较佳实施例，并不用以限制本公开，凡在本公开的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本公开的保护范围之内。

Claims (20)

  1. 一种切换方法，包括：
    第一终端通过源卫星向第二终端发送切换请求，其中，所述第一终端通过所述源卫星和所述第二终端之间建立通信链路，所述切换请求包括卫星重新选择指示和候选卫星的星历信息中至少一项；
    所述第一终端接收所述第二终端通过所述源卫星发送的切换确认消息，其中，所述切换确认消息包括目标卫星的信息，所述目标卫星是所述第二终端根据所述切换请求确定的；
    所述第一终端切换到所述目标卫星，通过所述目标卫星和所述第二终端建立通信链路。
  2. 根据权利要求1所述的切换方法，还包括：
    所述第一终端根据各个卫星的星历信息和各个卫星之间的连接信息，确定是否执行卫星切换；
    其中，所述第一终端通过源卫星向第二终端发送切换请求包括：
    所述第一终端在确定执行卫星切换的情况下，通过所述源卫星向所述第二终端发送所述切换请求。
  3. 根据权利要求1或2所述的切换方法，其中，所述候选卫星是所述第一终端根据各个卫星的星历信息和各个卫星之间的连接信息确定的。
  4. 根据权利要求1-3任一项所述的切换方法，其中，所述切换确认消息还包括：安全信息，用于验证所述通信链路建立是否成功。
  5. 根据权利要求1-4任一项所述的切换方法，其中，
    在所述切换请求包括所述候选卫星的星历信息或者在所述卫星重新选择指示包括所述候选卫星的标识的情况下，所述目标卫星是所述第二终端根据所述候选卫星的星历信息确定的；或者，
    在所述切换请求未包括所述候选卫星的星历信息且所述卫星重新选择指示用于指示重新选择连接的卫星的情况下，所述目标卫星是所述第二终端根据各个卫星的星历信息确定的；或者，
    在所述切换请求未包括所述候选卫星的星历信息且所述卫星重新选择指示包括所述目标卫星的标识的情况下，所述目标卫星是所述第二终端直接根据所述目标卫星 的标识确定的。
  6. 根据权利要求1-5任一项所述的切换方法，还包括：
    所述第一终端与所述源卫星建立连接，并通过所述源卫星与所述第二终端建立通信链路。
  7. 根据权利要求1-6任一项所述的切换方法，还包括：在所述第一终端接收所述第二终端通过所述源卫星发送的切换确认消息之前，
    在所述切换请求包括所述候选卫星的星历信息或者在所述卫星重新选择指示包括所述候选卫星的标识的情况下，所述源卫星向所述候选卫星发送存储的所述第一终端的上下文信息和所述第二终端的上下文信息，其中，所述第一终端的上下文信息和所述第二终端的上下文信息用于切换过程中所述第一终端和所述第二终端的授权和认证。
  8. 根据权利要求1-7任一项所述的切换方法，还包括：在所述第一终端接收所述第二终端通过所述源卫星发送的切换确认消息之后，
    所述源卫星向所述目标卫星发送存储的所述第一终端的上下文信息和所述第二终端的上下文信息，其中，所述第一终端的上下文信息和所述第二终端的上下文信息用于切换过程中所述第一终端和所述第二终端的授权和认证。
  9. 一种切换方法，包括：
    第二终端通过源卫星接收第一终端发送的切换请求，其中，所述第一终端通过所述源卫星和所述第二终端之间建立通信链路，所述切换请求包括卫星重新选择指示和候选卫星的星历信息中至少一项；
    所述第二终端根据所述切换请求确定目标卫星的信息；
    所述第二终端通过所述源卫星向所述第一终端发送切换确认消息，其中，所述切换确认消息包括目标卫星的信息；
    所述第二终端切换到所述目标卫星，通过所述目标卫星和所述第一终端建立通信链路。
  10. 根据权利要求9所述的切换方法，其中，所述切换确认消息还包括：安全信息，用于验证所述通信链路建立是否成功。
  11. 根据权利要求9或10所述的切换方法，其中，所述第二终端根据所述切换请求确定目标卫星的信息包括：
    在所述切换请求包括所述候选卫星的星历信息或者在所述卫星重新选择指示包 括所述候选卫星的标识的情况下，所述第二终端根据所述候选卫星的星历信息确定所述目标卫星的信息；或者，
    在所述切换请求未包括所述候选卫星的星历信息且所述卫星重新选择指示用于指示重新选择连接的卫星的情况下，所述第二终端根据各个卫星的星历信息确定所述目标卫星的信息；或者，
    在所述切换请求未包括所述候选卫星的星历信息且所述卫星重新选择指示包括所述目标卫星的标识的情况下，所述第二终端直接根据所述目标卫星的标识确定所述目标卫星的信息。
  12. 一种终端，被配置为第一终端，包括：
    发送器，用于通过源卫星向第二终端发送切换请求，其中，所述切换请求包括卫星重新选择指示和候选卫星的星历信息中至少一项；
    接收器，用于接收所述第二终端通过所述源卫星发送的切换确认消息，其中，所述切换确认消息包括目标卫星的信息，所述目标卫星是所述第二终端根据所述切换请求确定的；
    控制器，用于控制所述第一终端切换到所述目标卫星，通过所述目标卫星与所述第二终端建立通信链路。
  13. 一种终端，配置为第二终端，包括：
    接收器，用于通过源卫星接收第一终端发送的切换请求，其中，所述切换请求包括：卫星重新选择指示和候选卫星的星历信息中至少一项；
    控制器，用于根据所述切换请求确定目标卫星的信息，并控制所述第二终端切换到所述目标卫星，通过所述目标卫星与所述第一终端建立通信链路；
    发送器，用于通过所述源卫星向所述第一终端发送切换确认消息，其中，所述切换确认消息包括目标卫星的信息。
  14. 一种通信系统，包括：权利要求12所述的终端作为第一终端和权利要求13所述的终端作为第二终端。
  15. 根据权利要求14所述的通信系统，还包括：
    源卫星，用于接收所述第一终端发送的所述切换请求，并转发至所述第二终端，接收所述第二终端发送的所述切换确认消息，并转发至所述第一终端。
  16. 根据权利要求15所述的通信系统，其中，
    所述源卫星还用于存储所述第一终端的上下文信息和所述第二终端的上下文信 息，在接收所述第二终端发送的切换确认消息之前，在所述切换请求包括所述候选卫星的星历信息或者在所述卫星重新选择指示包括所述候选卫星的标识的情况下，向所述候选卫星发送所述第一终端的上下文信息和所述第二终端的上下文信息；和/或，在接收述第二终端发送的切换确认消息之后，向所述目标卫星发送所述第一终端的上下文信息和所述第二终端的上下文信息，
    其中，所述第一终端的上下文信息和所述第二终端的上下文信息用于切换过程中所述第一终端和所述第二终端的授权和认证。
  17. 根据权利要求14-16任一项所述的通信系统，还包括：
    目标卫星，用于响应于所述第一终端和所述第二终端的切换，与所述第一终端和所述第二终端建立连接，形成通信链路。
  18. 一种电子设备，包括：
    处理器；以及
    耦接至所述处理器的存储器，用于存储指令，所述指令被所述处理器执行时，使所述处理器执行如权利要求1-11任一项所述的切换方法。
  19. 一种计算机可读存储介质，其上存储有计算机程序，其中，该程序被处理器执行时实现权利要求1-11任一项所述方法的步骤。
  20. 一种计算机程序，包括：指令，所述指令被所述处理器执行时，使所述处理器执行如权利要求1-11任一项所述的切换方法。
PCT/CN2024/100385 2023-06-29 2024-06-20 切换方法、终端、通信系统以及电子设备 Ceased WO2025001960A1 (zh)

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