Mobile handover management method, satellite communication device, storage medium and program product

Abstract

The invention discloses a mobile switching management method, satellite communication equipment, a storage medium and a program product, and relates to the technical field of satellite communication. Whether the target user terminal is directly connected to the current satellite node or not can be quickly determined by using the positive service user list, and whether the target user terminal is in the service area of the current satellite node or not can be determined by using the positive service area list. Whether the target user terminal is in the service range of the adjacent satellite nodes or not can be determined by using the positive service user list of the neighbor nodes, and the position of the target user terminal can be efficiently determined under the high dynamic condition of the satellite network based on the cooperative use of the three lists dynamically maintained in each satellite node. And selecting an optimal path to route the paging message to the target user terminal.

Description

Technical Field

[0001] The present application relates to the field of satellite communication technology, and in particular to a mobile switching management method, satellite communication equipment, storage medium and program product. Background Art

[0002] Thanks to the development of computer technology and communication technology, mass satellite manufacturing, and the application of repeatable rocket launch technology, it has become possible to provide space-based broadband Internet services with bandwidth and latency performance matching that of terrestrial Internet through the deployment of large-scale low Earth orbit (LEO) satellites. This can also provide unique advantages over terrestrial networks in terms of global coverage, large-scale flexible communication deployment, and communication guarantee for emergency and disaster scenarios.

[0003] As the scale of satellite networks increases, ground users can "see" multiple satellites at the same time and establish connections with them. They can establish a connection with any satellite with the best link conditions based on actual conditions. However, since the link (Terminal to Satellite Link, TSL) between the ground terminal and the satellite is random and unpredictable, the location of the destination user terminal cannot be efficiently determined in the current highly dynamic satellite network system.

[0004] The above contents are only used to assist in understanding the technical solution of the present application and do not constitute an admission that the above contents are prior art. Summary of the invention

[0005] The main purpose of this application is to provide a mobile switching management method, satellite communication equipment, storage medium and program product, aiming to ensure that the location of the destination user terminal can be efficiently determined under high dynamics of the satellite network.

[0006] To achieve the above object, the present application proposes a mobile switching management method, which is applied to a satellite node in a satellite network system, and includes:

[0007] In response to a connection request from a user terminal, the satellite node assigns an IP address to the user terminal;

[0008] According to the IP address of the user terminal connected to the satellite node, the location information of the user terminal, and a first relationship table of the identification of the logical area and the geographical location information of the logical area pre-set in the database, a second relationship table of the identification of the logical area and the IP address of the user terminal is maintained in the database, wherein the logical area is a plurality of non-overlapping logical areas obtained by dividing the earth's surface, and each logical area corresponds to a unique area identification;

[0009] Maintaining a serving user list and a serving area list in the satellite node according to the IP address of the user terminal connected to the satellite node and the second relationship table, wherein the serving user list stores the IP address of the user terminal currently accessing the satellite node, and the serving area list stores the identifier of the logical area being served by the satellite node;

[0010] Maintaining a list of users being served by neighbor nodes in the satellite node according to a notification message received by the satellite node from a neighbor node, wherein the notification message includes an IP address of a user terminal being served by the neighbor node and an identifier of a logical area corresponding to the IP address of the user terminal being served by the neighbor node; the list of users being served by the neighbor node stores the IP addresses of user terminals served by neighbor nodes that are direct neighbors of the satellite node and share a logical area with the satellite node;

[0011] When the satellite node receives a paging message sent by a source user terminal or a source gateway, routing is performed based on the serving user list, the serving area list and the neighbor node serving user list of the satellite node.

[0012] The embodiment of the present application provides a mobile switching management method, in which three lists are dynamically maintained in each satellite node of the satellite network system, namely, a serving user list, a serving area list, and a neighbor node serving user list. When a satellite node receives a paging message sent by a source user terminal or a source gateway, the serving user list can be used to quickly determine whether the destination user terminal is directly connected to the current satellite node, the serving area list can be used to determine whether the destination user terminal is within the service area of ​​the current satellite node, and the neighbor node serving user list can be used to determine whether the destination user terminal is within the service range of an adjacent satellite node. Based on the coordinated use of these three lists dynamically maintained in each satellite node, it is ensured that the location of the destination user terminal can be efficiently determined under high dynamic conditions of the satellite network, and the optimal path is selected to route the paging message to the destination user terminal.

[0013] In one embodiment, the method further includes: updating the second relationship table when it is confirmed that the user terminal has entered a new logical area based on the location information provided by the user terminal, the first relationship table and the second relationship table.

[0014] In the embodiment of the present application, for mobile user terminals such as airplanes, ships, mobile vehicles, etc., when these mobile user terminals cross logical areas and move from one logical area to another, the correspondence between the IP address of the user terminal and the identifier of the logical area is updated to ensure the accuracy and real-time performance of the second relationship table.

[0015] In one embodiment, the method further comprises: when the satellite node receives a hand-in request from a user terminal, updating the serving user list according to the IP address of the hand-in user terminal.

[0016] In the embodiment of the present application, it is considered that when a user terminal moves from one logical area to another, the same satellite node may continue to provide access and broadband communication services, or the user terminal may switch from one satellite node to another satellite node, which may cause the user terminal served by the satellite node to change. Therefore, when a user terminal moves from one logical area to another, it is necessary to timely update and maintain the list of currently serving users in each satellite node, so as to ensure the real-time and accuracy of the list of currently serving users in each satellite node, and provide guarantee for routing transmission in subsequent communication processes.

[0017] In one embodiment, the method further comprises: when the satellite node detects that a user terminal is disconnected, updating the list of serving users according to the IP address of the disconnected user terminal.

[0018] In the embodiment of the present application, when a user terminal is disconnected from a satellite node, the method of the embodiment of the present application also includes: when the satellite node detects that a user terminal is disconnected, updating the list of currently served users according to the IP address of the disconnected user terminal, thereby ensuring the real-time and accuracy of the list of currently served users in each satellite node, and providing guarantee for routing transmission in subsequent communication processes.

[0019] In one embodiment, the method further includes: when the satellite node detects that its communication coverage has changed, updating the serving area list according to the current location information of the communication coverage and the first relationship table.

[0020] In the embodiments of the present application, the movement of satellite nodes is taken into consideration. The operating position of the satellite nodes changes, and the communication coverage range thereof changes accordingly. Thus, the service area of ​​the satellite nodes will also change. Therefore, it is necessary to timely update the service area list of each satellite node according to the changes in the operating position of each satellite node, so as to ensure the real-time and accuracy of each service area list, and provide guarantee for the routing transmission in the subsequent communication process.

[0021] In one embodiment, the method further includes: when the satellite node detects that its communication coverage has changed, updating the list of users being served by the neighboring node according to the current location information of the communication coverage and the first relationship table.

[0022] In the embodiment of the present application, when a satellite node detects that its communication coverage has changed, the list of users currently being served by the neighboring nodes of the satellite node is updated, thereby ensuring that when the logical area served by the neighboring node changes, the list of users currently being served by the neighboring nodes maintained by the satellite node can be updated in a timely manner, thereby ensuring the accuracy and real-time nature of the list of users currently being served by the neighboring nodes in the satellite node.

[0023] In one embodiment, the paging message includes an IP address of a destination user terminal and an identifier of a destination logical area;

[0024] The method of routing based on the serving user list, the serving area list and the neighbor node serving user list of the satellite node when the satellite node receives a paging message sent by the source user terminal or the source gateway includes: determining whether the IP address of the destination user terminal is in the serving user list of the satellite node when the satellite node receives a paging message sent by the source user terminal or the source gateway; if so, the satellite node forwards the paging message to the destination user terminal; if not, determining whether the identifier of the destination logical area is in the serving area list of the satellite node; if not, forwarding the paging message according to a preset routing strategy; if so, determining whether the IP address of the destination user terminal is in the serving terminal list of the neighbor node of the satellite node; if so, the satellite node forwards the paging message to the neighbor node, and the neighbor node forwards the paging message to the destination user terminal; if not, forwarding the paging message to the destination user terminal according to the routing strategy corresponding to the constellation orbit type to which the satellite node belongs.

[0025] In the embodiments of the present application, the logical area division of the earth's surface is combined with the update of the list of currently served users and the list of currently served areas after the user terminal and the satellite node are moved and switched, as well as the region-based neighbor announcement between satellite nodes and other technologies, which can solve the problem of last-hop reachability of users in highly dynamic satellite network systems and ensure that the last-hop reachability of users in highly dynamic satellite network systems.

[0026] In addition, to achieve the above-mentioned purpose, the present application also proposes a satellite communication device, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, and the computer program is configured to implement the steps of the above-mentioned routing method or the above-mentioned task switching management method.

[0027] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by the processor, the steps of the above-mentioned routing method or the above-mentioned task switching management method are implemented.

[0028] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, it implements the steps of the above-mentioned routing method or the above-mentioned task switching management method. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 Schematic diagram of satellite network and ground user terminal communication provided for this application;

[0032] Figure 2 A flowchart of a task switching management method embodiment 1 provided in the present application;

[0033] Figure 3 A flowchart of a second embodiment of the task switching management method provided by the present application;

[0034] Figure 4 A schematic diagram of the format of a paging message provided for this application;

[0035] Figure 5 Schematic diagram of the device structure of the hardware operating environment involved in the task switching management method in the embodiment of the present application.

[0036] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0037] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0038] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0039] Thanks to the development of computer technology and communication technology, mass satellite manufacturing, and the application of repeatable rocket launch technology, it has become possible to provide space-based broadband Internet services with bandwidth and latency performance matching that of terrestrial Internet through the deployment of large-scale low-Earth orbit (LEO) satellites. This can also provide unique advantages over terrestrial networks in terms of global coverage, large-scale flexible communication deployment, and communication support for emergency and disaster scenarios.

[0040] As the scale of satellite networks increases, ground users can "see" multiple satellites at the same time and establish connections with them. They can establish a connection with any satellite with the best link conditions based on actual conditions. Since the link TSL between the ground terminal and the satellite is random and unpredictable, the location of the destination user terminal cannot be efficiently determined in the current highly dynamic satellite network system.

[0041] In view of this, a mobile switching management method is provided in an embodiment of the present application, and three lists are dynamically maintained in each satellite node of the satellite network system, namely, a serving user list, a serving area list, and a neighbor node serving user list. When a satellite node receives a paging message sent by a source user terminal or a source gateway, the serving user list can be used to quickly determine whether the destination user terminal is directly connected to the current satellite node, the serving area list can be used to determine whether the destination user terminal is within the service area of ​​the current satellite node, and the neighbor node serving user list can be used to determine whether the destination user terminal is within the service range of an adjacent satellite node. Based on the coordinated use of these three lists dynamically maintained in each satellite node, it is ensured that the location of the destination user terminal can be efficiently determined under high dynamic conditions of the satellite network, and the optimal path is selected to route the paging message to the destination user terminal.

[0042] First, the satellite network system involved in the embodiments of the present application is described.

[0043] The integrated space-ground network consists of two parts: the ground network (including the ground mobile network) and the satellite network (such as the giant low-orbit satellite constellation network). The ground network consists of a certain number of user terminals and gateways. The communication between any two user terminals in the ground network needs to go through the gateway; the satellite network consists of multiple satellite nodes interconnected by inter-satellite links (ISL). There are two types of satellite network communications. One is direct communication between user terminals through the satellite network without going through the ground network. See Figure 1 As shown, user terminal 1 communicates with user terminal 2 via satellite node 1, satellite node 2 and satellite node 3; another type is an application or user terminal in which a user terminal accesses a terrestrial network via a satellite network, see Figure 1As shown, the user terminal 3 communicates with the ground gateway via satellite node 1, satellite node 2 and satellite node 3, thereby accessing the ground data center via the ground gateway. In this type of communication, it is necessary to go through the gateway, which can be regarded as a bridge for communication between the satellite network and the ground network. The gateway is responsible for forwarding the communication data within the satellite network to the ground network, and is also responsible for forwarding the communication data of the ground network to the satellite network. Therefore, the gateway needs to provide network address translation (NAT) services for the internal IP address of the satellite network and the external IP address of the Internet, so as to communicate between the satellite network and the ground network.

[0044] It is worth noting that the IP address of the user terminal involved in the embodiments of the present application is a private address and is used within the satellite network.

[0045] In the embodiment of the present application, user terminals include: fixed-location user terminals and mobile user terminals. Fixed-location user terminals include user PCs, laptops, pads and other devices, and mobile user terminals include mobile broadband phones, airplanes, ships, mobile vehicles and the like.

[0046] The mobile switching management method provided in the embodiment of the present application can be applied to a satellite network system including multiple satellite nodes, such as a typical giant low-orbit satellite constellation network (LEO Mega-Constellation Network, LEO-MCN) under construction and to be built. In order to give full play to the advantages of satellite networks, satellite networks need to be integrated with ground networks to carry various network applications with IP technology as the mainstream, such as video, games, online transactions, instant messaging, Internet of Things (IoT) and other applications. LEO-MCN is large in scale, including hundreds to tens of thousands of satellites operating in low earth orbit. These satellites are usually planned in one or more regularly distributed orbits, and the orbital altitude is usually between 500-1500km (orbital period is about 95-140min), forming a satellite constellation to achieve global coverage. Compared with satellite networks in higher orbits, LEO-MCN can support smaller user terminals, such as smaller antenna size, lower power requirements, better frequency reuse, and have transmission delays that can compete with ground networks. It is feasible that the satellite network system in the embodiment of the present application can be a low-orbit satellite network system.

[0047] In the embodiment of the present application, the set of all satellites in a satellite network system can be expressed as S=(S n,m), where n is the number of the orbital plane (OP) where the satellite is located, n = 0, 1, ..., N-1, and m is the number of the satellite in the orbital plane, m = 0, 1, ..., M-1. In addition, the satellite set can also be expressed as S = (S i ), where i = 0, 1, …, n × m-1. Each satellite can establish a total of 4 inter-satellite links with two satellites in the same orbit (front and back) and two satellites in adjacent orbits (left and right). The inter-satellite link can be a laser communication link (Laser-ISL). The inter-satellite link in the same orbital plane is called intra-plane ISL, and the inter-satellite link between different orbital planes is called inter-plane ISL.

[0048] Figure 2 The figure is a flow chart of a mobile switching management method applied to the satellite network system, which includes the following steps:

[0049] Step S101: In response to a connection request from a user terminal, a satellite node allocates an IP address to the user terminal.

[0050] The user terminal first searches for the satellite signal and synchronizes with the satellite node. The user terminal sends a connection request to the satellite node. After receiving the connection request, the satellite node authenticates the user terminal. Identity authentication ensures that only legitimate users can access the satellite network. The satellite node assigns a fixed IP address and other network configuration parameters to the authenticated user terminal. Each user terminal corresponds to a unique IP address (u_id). The user terminal receives the assigned network configuration parameters and configures them to its own network interface to complete the access process. After the user terminal accesses the satellite node and obtains the IP address, it can transmit data through the satellite network.

[0051] Step S102, based on the IP address of the user terminal connected to the satellite node, the location information of the user terminal, and the first relationship table between the identifier of the logical area and the geographical location information of the logical area pre-set in the database, maintain a second relationship table between the identifier of the logical area and the IP address of the user terminal in the database.

[0052] In the embodiment of the present application, the virtual node method is used to divide the earth's surface into non-overlapping (including non-intersecting and non-overlapping) cell or grid areas, hereinafter collectively referred to as logical areas. Multiple satellite nodes can cover the same logical area at the same time, and a satellite node may also cover multiple logical areas at the same time. There is no mandatory coupling or mapping relationship between satellite nodes and logical areas. The logical areas after the earth's surface is divided can be expressed as: R = {region_1, region_2, ..., region_n}, abbreviated as: R = {r1, r2, ..., rn}, where there is no intersection or overlap between any two logical areas. Each logical area corresponds to a unique regional identifier (r_id) for the entire network.

[0053] For example, the earth's surface can be divided into multiple non-overlapping logical areas according to the management requirements of the satellite network operator. In this way, the number of divided logical areas is controllable and manageable, and it is convenient for each operator to manage the satellite network system. The division of logical areas can be regular or irregular, and is not limited in the embodiments of the present application.

[0054] Each logical region is associated with a geographical location information, and the geographical location information indicates the location of the logical region on the earth's surface. Exemplarily, the geographical location information of the logical region includes the longitude and latitude of the logical region, and the longitude and latitude of the logical region may be the longitude and latitude of the representative location of the logical region. The geographical location information may be expressed as<log,lat> , so the logical region can be expressed as Region = {r_id,<lon,lat>}.

[0055] Based on the above content, the identification (r_id) of the logical area and the geographical location information (<lon,lat> ), due to the identification of the logical region (r_id) and the geographical location information of the logical region (<lon,lat> ) is unique and does not change with the movement of the satellite node or the user terminal. Therefore, the first relationship table will not change after it is determined. The above database can be a management database of the operator, which belongs to the cloud database and is not set in a certain satellite node. In this way, each satellite node and each user terminal connected to the satellite node can access the content in the database.

[0056] After the user terminal is connected to the satellite node, the satellite node searches the first relational table of the database for the logical area corresponding to the location information according to the IP address (u_id) of the connected user terminal and the location information reported by the user terminal, determines the identifier of the logical area to which the user terminal belongs, and maintains the second relational table of the identifier of the logical area and the IP address of the user terminal in the database. The location information of the user terminal may be the longitude and latitude of the user terminal.

[0057] It is worth noting that each satellite node can maintain a second relationship table based on the IP address (u_id) of the user terminal connected to it and the identifier (r_id) of the logical area corresponding to the IP address. Therefore, the second relationship table includes the IP address (u_id) of the user terminal connected to each satellite node and the identifier (r_id) of the corresponding logical area.

[0058] In the embodiment of the present application, the earth's surface is divided into logical areas, and a second relationship table between the identifiers of the logical areas and the IP addresses of the user terminals is maintained in the database, which provides an addressing basis for communications in the satellite network and ensures that the correct destination can be found during the communication process.

[0059] For user terminals with relatively fixed locations, the correspondence between the IP addresses of the user terminals and the identifiers of the logical areas is relatively stable. However, for mobile user terminals such as airplanes, ships, and mobile vehicles, when these mobile user terminals cross logical areas and move from one logical area to another, the correspondence between the IP addresses of the user terminals and the identifiers of the logical areas needs to be updated to ensure the accuracy and real-time performance of the second relationship table.

[0060] In view of this, the method in the embodiment of the present application further includes: updating the second relationship table when it is confirmed that the user terminal has entered a new logical area based on the location information provided by the user terminal, the first relationship table and the second relationship table.

[0061] The location information provided by the user terminal may be GPS positioning information. The satellite node actively or passively tracks the location change of the mobile user terminal through the GPS positioning information provided by the user terminal, the first relationship table and the second corresponding relationship. When it is confirmed that the user terminal has entered a new logical area, the second relationship table is updated. For example, in the second relationship table, the user terminal with IP address u_id_1 corresponds to the logical area identified as r_id_5. The geographical location information corresponding to the logical area identified as r_id_5 in the first relationship table is<lon_1,lat_2> , and as the location information reported by the user terminal changes, the user terminal moves to<lon_2,lat_2> The corresponding logical area, at this time, the geographical location information can be found according to the first relationship table.<lon_1,lat_2> The identifier of the corresponding logical area is r_id_6. Thus, the identifier r_id_6 of the new logical area corresponding to the user terminal with the IP address u_id_1 is used to update the second relationship table.

[0062] Step S103: maintaining a serving user list and a serving area list in the satellite node according to the IP address of the user terminal connected to the satellite node and the second relationship table.

[0063] In the embodiment of the present application, each satellite node of the satellite network dynamically maintains a serving user list (List of Servicing User, LSU) and a serving area list (List of Servicing Region, LSR), wherein the serving user list stores the IP address of the user terminal currently accessing the satellite node, and the serving area list stores the identifier of the logical area being served by the satellite node, wherein the logical area being served by the satellite node is the logical area covered by the satellite node.

[0064] The list of currently serving users of the satellite node is generated according to the IP address of the user terminal connected to the satellite node. The list of currently serving users of a certain satellite node can be expressed as<u_ip_1,u_ip_2,…,u_ip_n> According to the IP address of the user terminal connected to the satellite node, the identifier of the logical area corresponding to each IP address is searched in the second relationship table, and a list of serving areas is generated according to the identifier of the logical area corresponding to each IP address. The list of serving areas of a certain satellite node can be expressed as<r_id_1,r_id_2,…,r_id_m> .

[0065] In the embodiment of the present application, each satellite node of the satellite network dynamically maintains a list of currently serving users and a list of currently serving areas. The currently serving user list can quickly determine whether the destination user terminal is directly connected to the current satellite node, and the currently serving area list can determine whether the destination user terminal is within the service area of ​​the current satellite node, even if it is not directly connected to the node. In this way, the satellite node can efficiently determine the location of the destination user terminal during the communication process, and select the optimal path to route the communication data to the destination user terminal.

[0066] In a possible implementation, considering that the user terminal moves from one logical area to another, it is possible that the same satellite node continues to provide access and broadband communication services, or it is possible that the user terminal switches from one satellite node to another satellite node, which will cause the user terminal served by the satellite node to change. Therefore, when the user terminal moves from one logical area to another, it is necessary to timely update and maintain the service user list in each satellite node, so as to ensure the real-time and accuracy of the service user list in each satellite node, and provide guarantee for the routing transmission in the subsequent communication process.

[0067] When a user terminal switches to a satellite node, the method of an embodiment of the present application further includes: when the satellite node receives a switching-in request from the user terminal, updating a serving user list and a serving area list according to the IP address of the switching-in user terminal.

[0068] The user terminal will regularly detect the signal strength and quality of the surrounding satellite nodes. When it detects that the signal of another satellite node is better (for example, the signal strength is stronger, the delay is lower, or the service quality is higher), the user terminal will decide to switch. The user terminal will send a switching request to the satellite node that is about to switch in, and the switching request includes the IP address of the user terminal. After receiving the switching request, the satellite node that is about to switch in can perform a series of preparations, including resource allocation (such as IP address, communication channel, etc.), security verification and session establishment. After the satellite node that is about to switch in is ready to receive the user terminal, it will send a switching confirmation message to the user terminal, which may include new configuration parameters and switching instructions; after receiving the switching confirmation message, the user terminal will establish a connection with the satellite node that is about to switch in according to the new configuration parameters, and disconnect from the original satellite node, thus completing the switching process. The newly switched in satellite node will add the IP address of the user terminal to the list of serving users, thereby updating the list of serving users.

[0069] When a user terminal is disconnected from a satellite node, the method of the embodiment of the present application further includes: when the satellite node detects that a user terminal is disconnected, updating the service user list according to the IP address of the disconnected user terminal, thereby ensuring the real-time and accuracy of the service user list in each satellite node, and providing guarantee for the routing transmission in the subsequent communication process. Specifically, the IP address of the disconnected user terminal is deleted from the service user list.

[0070] For example, if a user terminal with IP address u_ip_5 switches from satellite node A to satellite node C, then u_ip_5 is deleted from the service user list of satellite node A, and u_ip_5 is added to the service user list of satellite node C.

[0071] In another possible implementation method, taking into account the movement of satellite nodes, the operating position of satellite nodes changes, and correspondingly its communication coverage changes. In this way, the service area of ​​the satellite nodes will also change. Therefore, it is necessary to timely update the list of active service areas of each satellite node according to the changes in the operating position of each satellite node, so as to ensure the real-time and accuracy of each active service area list, and provide guarantee for routing transmission in subsequent communication processes.

[0072] In view of this, the method in the embodiment of the present application also includes: when the satellite node detects that its communication coverage has changed, updating the service area list according to the location information of the current communication coverage and the first relationship table.

[0073] In the case where the satellite node detects that its communication coverage has changed, the logical area whose geographical location falls into the current communication coverage of the satellite node is determined according to the location information of the current communication coverage and the first relationship table. The geographical location of the logical area falls into the current communication coverage of the satellite node, indicating that the satellite node serves the logical area. The list of serving areas is updated according to the identifier of the logical area whose geographical location falls into the current communication coverage of the satellite node, that is, the identifier of the logical area currently served by the satellite node. For example, the logical areas served by satellite node A include r_id_1, r_id_2 and r_id_3. If the communication coverage of satellite node A changes, the logical areas served by it include r_id_2, r_id_3 and r_id_4, then the logical area r_id_1 is deleted from the list of serving areas of satellite node A, and the logical area r_id_4 is added, thereby updating the list of serving areas of satellite node A.

[0074] Step S104: maintaining a list of users being served by the neighboring nodes in the satellite node according to the notification message received by the satellite node from the neighboring nodes.

[0075] In the embodiment of the present application, each satellite node maintains a list of adjacent serving users (LASU), and the adjacent serving user list stores the IP addresses of user terminals served by the adjacent nodes that are direct neighbors of the satellite node and share a logical area with the satellite node.

[0076] In practice, step S104 specifically includes: determining whether the identifier of the logical area corresponding to the IP address of the user terminal being served by the neighboring node in the notification message is in the list of serving areas of the satellite node; if it is in the list of serving areas of the satellite node, maintaining the list of users being served by the neighboring node in the satellite node according to the IP address of the user terminal being served by the neighboring node; if it is not in the list of serving areas of the satellite node, no processing is performed. The notification message includes the IP address of the user terminal being served by the neighboring node and the identifier of the logical area corresponding to the IP address of the user terminal being served by the neighboring node.

[0077] Specifically, the notification message from the neighbor node is first received, and then it is determined whether the identifier r_id of the logical area in the notification message is in the service area list of the satellite node. If not, it means that the logical area corresponding to the notification message is not within the communication service range of the satellite node, and the notification message is not processed. If the identifier r_id of the logical area of ​​the notification message is in the service area list of the satellite node, the satellite node's neighbor node service terminal list is updated, and the corresponding port information ef is recorded. The processing of the notification message will not affect the satellite node's service user list, but will only update the satellite node's neighbor node service terminal list.

[0078] For example, the nodes of satellite node A's direct neighbors include satellite node B and satellite node C. The IP addresses of the user terminals being served by satellite node B include u_ip_4, u_ip_5, and u_ip_6, wherein the identifier of the logical area corresponding to u_ip_4 is r_id_2, the identifier of the logical area corresponding to u_ip_5 is r_id_2, and the identifier of the logical area corresponding to u_ip_6 is r_id_3. The IP addresses of the user terminals being served by satellite node C include u_ip_8, u_ip_9, and u_ip_10, wherein the identifier of the logical area corresponding to u_ip_8 is r_id_3, the identifier of the logical area corresponding to u_ip_9 is r_id_3, and the identifier of the logical area corresponding to u_ip_10 is r_id_4. If the identifiers of the logical areas being served stored in the serving area list of satellite node A include r_id_1, r_id_2, and r_id_3, then the neighbor node serving user list maintained in satellite node A includes: r_id_2, u_ip_4, ef-satellite node B; r_id_2, u_ip_5, ef-satellite node B; r_id_3, u_ip_6, ef-satellite node B; r_id_3, u_ip_8, ef-satellite node C; r_id_3, u_ip_9, ef-satellite node C. Among them, ef represents the egress port, and ef-satellite node B indicates that the egress port is satellite node B.

[0079] In the embodiment of the present application, each satellite node in the satellite network dynamically maintains a list of users being served by neighbor nodes, so that the satellite node can select a suitable path for data transmission during the communication process. Since the satellite node is restricted to only announce and process relevant information of the logical area shared with the satellite node, network congestion and waste of resources caused by flooding communication data between neighboring nodes can be avoided.

[0080] It is worth noting that satellite node A also regularly sends the IP address of the user terminal being served by this satellite node and the identifier of the logical area corresponding to the IP address of the user terminal being served by this satellite node to satellite node B and satellite node C. Satellite node B and satellite node C also maintain a list of users being served by neighboring nodes. The specific process can be found in the above content and will not be repeated here.

[0081] It is worth noting that if the user terminal or logical area served by the neighboring nodes (satellite node B and satellite node C) directly adjacent to the satellite node (such as satellite node A) changes, the list of users being served by the neighboring nodes maintained in the satellite node (such as satellite node A) will change. Continuing with the above example, if the logical area served by satellite node B does not include r_id_2, the list of users being served by the neighboring nodes maintained by satellite node A does not include "r_id_2, u_ip_4, ef-satellite node B, and r_id_2, u_ip_5, ef-satellite node B". If the user terminal served by satellite node B does not include u_ip_6, the list of users being served by the neighboring nodes maintained by satellite node A does not include "r_id_3, u_ip_6, ef-satellite node B".

[0082] In view of this, in order to timely update the neighbor node service user list and ensure the accuracy and timeliness of the neighbor node service user list, the satellite node (such as satellite node A) can periodically receive notification messages from neighbor nodes (satellite node B and satellite node C), and then timely update the neighbor node service user list of the satellite node (such as satellite node A); or, when the user terminal served by the neighbor node (such as satellite node B and satellite node C) or the logical area served changes, that is, when the neighbor node (such as satellite node B and satellite node C) service user list and service area list are updated, send a notification message to the satellite node (such as satellite node A), and the satellite node (such as satellite node A) timely updates the neighbor node service user list of the satellite node (such as satellite node A) according to the notification message, thereby ensuring that when the user terminal served by the neighbor node or the logical area served changes, the neighbor node service user list maintained by the satellite node can be updated immediately, and the accuracy and timeliness of the neighbor node service user list in the satellite node are guaranteed.

[0083] In addition, since the neighbor node service user list maintained by each satellite node is also related to the logical area served by the satellite node, continuing the above example, if the logical area served by the satellite node (such as satellite node A) does not include r_id_2, then the neighbor node service user list maintained by the satellite node (such as satellite node A) does not include "r_id_2, u_ip_4, ef-satellite node B, and r_id_2, u_ip_5, ef-satellite node B". Therefore, when the logical area served by the satellite node changes, the neighbor node service user list of the satellite node may be updated in time.

[0084] The method of the embodiment of the present application further includes: when the satellite node detects that its communication coverage has changed, updating the neighbor node serving user list according to the location information of the current communication coverage and the first relationship table. That is, when the satellite node detects that its communication coverage has changed, not only the serving area list LSR of the satellite node is updated, but also the neighbor node serving user list LASU of the satellite node is updated.

[0085] Step S105: When the satellite node receives a paging message sent by the source user terminal or the source gateway, routing is performed based on the satellite node's serving user list, serving area list, and neighbor node serving user list.

[0086] The paging message includes at least the IP address of the source user terminal or the IP address of the source gateway, and the IP address of the destination user terminal.

[0087] In the embodiment of the present application, three lists are maintained in each satellite node, namely, the serving user list LSU, the serving area list LSR and the neighbor node serving user list LASU. Among them, the serving user list LSU is used to quickly determine whether the destination user terminal is directly connected to the current satellite node. If the destination user terminal is in this list, communication can be carried out directly without further addressing; the serving area list LSR is used to determine whether the destination user terminal is in the service area of ​​the current satellite node, even if it is not directly connected to the node. If the destination user terminal is in this area, the communication strategy within the area can be adopted to try to establish a connection; the neighbor node serving user list LASU is used to determine whether the destination user terminal is within the service range of the adjacent satellite node. If the destination user terminal is within the service range of the neighbor node, the message can be forwarded to the neighbor node for further routing to the destination user terminal. When the satellite node receives a paging message sent by the source user terminal or the source gateway, based on the coordinated use of these three lists, the satellite node can efficiently determine the location of the destination user terminal and select the optimal path to route the paging message to the destination user terminal.

[0088] A feature of satellite network system is that satellite nodes can sense geographic location information. As a carrier network for broadband services, the essence of satellite network system communication and routing is to forward paging messages from a certain location on the ground (such as a source user terminal or a source gateway) and downlink them to another location on the ground (such as a destination user terminal). Therefore, a natural routing method is routing based on geographic location or orientation, that is, trying to route paging messages toward the destination location and orientation / direction.

[0089] Based on this, a geographic location-based routing method can be used in the embodiments of the present application for addressing and reasoning, including: the satellite node obtains its own geographic location information, which can be achieved through GPS, inertial navigation system or other positioning technologies, and based on the location information of the satellite node and the location information of the destination user terminal, by querying the serving user list LSU, the serving area list LSR and the neighbor node serving user list LASU, a neighbor node is selected as the next hop for forwarding.

[0090] Figure 3 The figure shows a specific flow chart of the last hop routing method based on the mobile switching management method of the satellite network system. The step S105 specifically includes the following steps:

[0091] Step S1051: When the satellite node receives a paging message sent by the source user terminal or the source gateway, it determines whether the IP address of the destination user terminal is in the list of serving users of the satellite node. If yes, step S1052 is executed; if not, step S1053 is executed.

[0092] The source user terminal or source gateway encapsulates the IP packet transmitted to the outbound router into a paging message. The paging message uses a protocol data unit (PDU) to encode the IP address of the destination user terminal and the identifier of the destination logical area corresponding to the destination user terminal into the PDU. The satellite node in the satellite network receives the paging message sent by the source user terminal or source gateway, and performs addressing and routing according to the IP address of the destination user terminal and the identifier of the destination logical area corresponding to the destination user terminal in the paging message.

[0093] Figure 4It is a format of a paging message, including the address s_ip of a source device (such as a source user terminal or a source gateway), the identifier s_r_id of a logical area corresponding to the source device, the IP address d_ip of a destination user terminal, the identifier d_r_id of a destination logical area corresponding to the destination user terminal, message data data and check information (Frame Check Sequence, FCS). It can be implemented that the paging message also includes the location information of the target area corresponding to the destination user terminal. In the embodiment of the present application, the location information is identified by longitude and latitude as d_lon and d_lat. It is worth noting that the paging message may also include other information related to two-way communication, which will not be described in detail in the embodiment of the present application.

[0094] Step S1052: The satellite node forwards the paging message to the destination user terminal.

[0095] After receiving the paging message, the satellite node first determines whether the IP address of the destination user terminal in the paging message is in the service user list LSU. If it is in the service user list, it means that the destination user terminal is being served by this satellite node. This satellite node directly forwards the paging message to the destination user terminal, and the routing ends. This satellite node is the last hop satellite node in the satellite network system that forwards the paging message to the destination user terminal.

[0096] Step S1053, determine whether the identifier of the destination logical area is in the list of serving areas. If not, execute step S1054; if yes, execute step S1055;

[0097] Step S1054: forward the paging message according to the preset routing strategy.

[0098] If the IP address of the destination user terminal is not in the list of the serving area, it indicates that the destination user terminal is not served by this satellite node, and this satellite node is not the satellite node of the last hop. At this time, it is further determined whether the identifier of the destination logical area in the paging message is in the list of the serving area. If it is not in the list of the serving area, it indicates that the paging message has not yet reached the area range of the last hop. At this time, the paging message can be forwarded according to the preset routing strategy. The preset routing strategy in the embodiment of the present application can be set as needed, and a routing method strategy based on geographical location can be adopted, which will not be described in detail here.

[0099] Step S1055, determine whether the IP address of the destination user terminal is in the list of terminals being served by the neighboring node. If yes, execute step S1056; if not, execute step S1057.

[0100] Step S1056: The satellite node forwards the paging message to the neighboring node, and the neighboring node forwards the paging message to the destination user terminal.

[0101] If the IP address of the destination user terminal is in the list of serving areas, it indicates that the paging message has reached the area range of the last hop. At this time, it is further determined whether the IP address of the destination user terminal is in the list of serving terminals of the neighboring node. If it is in the list of serving terminals of the neighboring node, it indicates that the destination user terminal has established a communication connection with the neighboring node, and the neighboring node is the satellite node of the last hop. At this time, the satellite node can forward the paging message to the neighboring node, and the neighboring node will forward the paging message to the destination user terminal.

[0102] It is worth noting that the neighbor node serving terminal list stores the port information ef of the neighbor node corresponding to the terminal device. The satellite node can forward the paging message to the neighbor node according to the port information ef of the neighbor node corresponding to the terminal device.

[0103] Step S1057: forward the paging message to the destination user terminal according to the routing strategy corresponding to the constellation orbit type to which the satellite node belongs.

[0104] If the IP address of the destination user terminal is not in the serving user list LSU of this satellite node, the IP address of the destination user terminal is in the serving area list LSR, and the IP address of the destination user terminal is not in the serving terminal list of the neighboring node, it indicates that the destination user terminal has reached the area of ​​the last hop, but is not served by this satellite node and its neighboring nodes. At this time, the paging message can be forwarded to the destination user terminal according to the routing policy corresponding to the constellation orbit type to which the satellite node belongs.

[0105] In the embodiment of the present application, the service user list of the satellite node is first queried. If the IP address of the destination user terminal is in the service user list, it indicates that the satellite node is the node with the last hop to connect to the destination user terminal, and the satellite node forwards the paging message to the destination user terminal. If the IP address of the destination user terminal is not in the service user list, the service area list of the satellite node is further queried. If the identifier of the destination logical area is not in the service area list of the satellite node, it indicates that the logical area where the destination user terminal is located has not been reached, and it can be forwarded according to the normal routing strategy. If the identifier of the destination logical area is in the service area list of the satellite node, it indicates that the logical area where the destination user terminal is located has been reached. However, since the satellite node does not serve the destination user terminal, it is further determined whether the IP address of the destination user terminal is in the service terminal list of the neighbor node of the satellite node, and it is determined whether the destination user terminal is served by the neighbor node of the satellite node. If it is determined whether the IP address of the destination user terminal is in the service terminal list of the neighbor node of the satellite node, it indicates that the neighbor node of the satellite node is the node with the last hop to connect to the destination user terminal, and the neighbor node forwards the paging message to the destination user terminal. If the IP address of the destination user terminal is not in the list of terminals being served by the neighboring nodes of the satellite node, it indicates that the satellite node and the neighboring nodes of the satellite node are not the last hop nodes of the destination user terminal. At this time, it can be determined that the destination user terminal is provided with services by a satellite node on an orbital plane adjacent to the orbital plane of the satellite node and in the opposite direction of operation, or by a satellite node on a communication plane in the opposite direction of operation of the satellite node. Therefore, in the embodiment of the present application, these two situations are distinguished by determining the constellation orbit type to which the satellite node belongs, so as to select the corresponding routing strategy to forward the paging message to the destination user terminal.

[0106] To sum up, the embodiments of the present application combine the logical area division of the earth's surface, the update of the list of currently served users and the list of currently served areas after the user terminal and the satellite node move and switch, as well as the region-based neighbor notification between satellite nodes and other technologies, which can solve the problem of the last-hop reachability of users under the highly dynamic satellite network system, and ensure that the last-hop reachability of users under the highly dynamic satellite network system.

[0107] Due to the characteristics of satellite movement, for polar orbit constellations, the satellites between the first orbital plane and the last orbital plane move in opposite directions, forming a seam. The relative AER (AER includes: azimuth, elevation and range) between the satellites on both sides of the seam changes dramatically, making it difficult to establish inter-satellite links. For inclined orbit constellations, since half of the satellites on each orbital plane always move from southwest to northeast (ascending orbit), and the other half of the satellites move from northwest to southeast on the other side of the earth (descending orbit), two communication planes with different running directions are actually formed (referred to as ascending orbit plane and descending orbit plane, respectively). The satellites on the two communication planes also have difficulty in establishing inter-satellite links due to the dramatic changes in relative AER.

[0108] Based on the above, it is difficult for a satellite node to establish an inter-satellite link with a satellite node on an orbital plane adjacent to the orbital plane of the satellite node and running in the opposite direction, and it is difficult for a satellite node to establish an inter-satellite link with a satellite node on a communication plane running in the opposite direction of the satellite node. Therefore, the satellite node cannot know the list of users being served by the neighbor nodes of these satellite nodes.

[0109] When the IP address of the destination user terminal is not in the serving user list LSU of the satellite node, the IP address of the destination user terminal is in the serving area list LSR, and the IP address of the destination user terminal is not in the serving terminal list of the neighboring node, it indicates that the destination user terminal has reached the area range of the last hop, but is not served by the satellite node and the neighboring nodes of the satellite node, but may be served by the satellite nodes on the opposite orbital plane or the opposite communication plane mentioned above.

[0110] In view of this, step S1057 in the embodiment of the present application includes the following contents:

[0111] Determine whether the constellation orbit type to which the satellite node belongs is a polar orbit constellation or an inclined orbit constellation. If it is a polar orbit constellation, the paging message is forwarded to the satellite node on the other side of the seam, and the satellite node on the other side of the seam forwards the paging message to the destination user terminal; if it is an inclined orbit constellation, the paging message is forwarded across the inclined orbit and the polar orbit to the satellite node on the other communication plane, and the satellite node on the other communication plane forwards the paging message to the destination user terminal.

[0112] When it is determined that the destination user terminal has reached the area of ​​the last hop, but is not served by the satellite node and the neighboring nodes of the satellite node, the constellation orbit type to which the satellite node belongs is determined to distinguish whether the satellite node belongs to a polar orbit constellation or an inclined orbit constellation. When the satellite node belongs to a polar orbit constellation, it indicates that the destination area is on the other side of the seam of the polar orbit constellation. The paging message is forwarded to the satellite node on the other side of the seam through the cross-polar routing strategy, and the satellite node on the other side of the seam forwards the paging message to the destination user terminal according to the preset routing strategy; when the satellite node belongs to an inclined orbit constellation, it indicates that the access satellite of the destination user terminal may be on another communication plane with the opposite running direction. The paging message is forwarded across the high latitude area (inclined orbit) and the polar area (polar orbit) to the satellite node on the other communication plane, and the satellite node on the other communication plane forwards the paging message to the destination user terminal according to the preset routing strategy forwarding logic.

[0113] In the embodiment of the present application, the corresponding routing strategy is selected for forwarding according to the constellation orbit type to which the satellite node belongs, further ensuring that when the satellite node passes through high latitudes (inclined orbits) and polar regions (polar orbits), there is still a reliable inter-satellite link to transmit paging messages, further ensuring that the user's last hop is reachable under the high dynamics of the satellite network system.

[0114] The present application also provides a satellite communication device, the satellite communication device comprising: at least one processor; and a memory connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the task switching management method in the above embodiment. The above satellite communication device can be a signal processing device of a satellite node.

[0115] Reference below Figure 5 , which shows a schematic diagram of the structure of a satellite communication device suitable for implementing the embodiments of the present application. The satellite communication device in the embodiments of the present application may include but is not limited to mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 5 The satellite communication device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0116] like Figure 5As shown, the satellite communication device may include a processing device 1001 (e.g., a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read Only Memory) 1002 or a program loaded from a storage device 1003 to a random access memory (RAM: Random Access Memory) 1004. In RAM1004, various programs and data required for the operation of the satellite communication device are also stored. The processing device 1001, ROM1002, and RAM1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, a vibrator, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the satellite communication device to communicate with other devices wirelessly or by wire to exchange data. Although the satellite communication device with various systems is shown in the figure, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems can be implemented or have alternatively.

[0117] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0118] It should be understood that the various parts disclosed in this application can be implemented by hardware, software, firmware or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0119] 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.

[0120] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, computer programs) stored thereon, and the computer-readable program instructions are used to execute the task switching management method in the above-mentioned embodiment.

[0121] The computer-readable storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM: Random Access Memory), a read-only memory (ROM: Read Only Memory), an erasable programmable read-only memory (EPROM: Erasable Programmable Read Only Memory or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM: CD-Read Only Memory), an optical storage device, a magnetic storage device, or any suitable combination of the above. In an embodiment of the present application, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency: Radio Frequency), etc., or any suitable combination of the above.

[0122] The computer-readable storage medium may be included in the satellite communication device; or may exist independently without being installed in the satellite communication device.

[0123] The computer-readable storage medium carries one or more programs. When the one or more programs are executed by the satellite communication device, the satellite communication device implements the task switching management method in the above embodiment.

[0124] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0125] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0126] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0127] The present application also provides a computer program product, including a computer program, which implements the steps of the task switching management method as described above when executed by a processor.

[0128] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A mobile switching management method, characterized in that: The method is applied to a satellite node in a satellite network system, and the method comprises: In response to a connection request from a user terminal, the satellite node assigns an IP address to the user terminal; According to the IP address of the user terminal connected to the satellite node, the location information of the user terminal, and a first relationship table of the identification of the logical area and the geographical location information of the logical area pre-set in the database, a second relationship table of the identification of the logical area and the IP address of the user terminal is maintained in the database, wherein the logical area is a plurality of non-overlapping logical areas obtained by dividing the earth's surface, and each logical area corresponds to a unique area identification; Maintaining a serving user list and a serving area list in the satellite node according to the IP address of the user terminal connected to the satellite node and the second relationship table, wherein the serving user list stores the IP address of the user terminal currently accessing the satellite node, and the serving area list stores the identifier of the logical area being served by the satellite node; Maintaining a list of users being served by neighbor nodes in the satellite node according to a notification message received by the satellite node from a neighbor node, wherein the notification message includes an IP address of a user terminal being served by the neighbor node and an identifier of a logical area corresponding to the IP address of the user terminal being served by the neighbor node; the list of users being served by the neighbor node stores the IP addresses of user terminals served by neighbor nodes that are direct neighbors of the satellite node and share a logical area with the satellite node; When the satellite node receives a paging message sent by a source user terminal or a source gateway, routing is performed based on the serving user list, the serving area list and the neighbor node serving user list of the satellite node.

2. The method according to claim 1, characterized in that The method further includes: updating the second relationship table when it is confirmed that the user terminal has entered a new logical area according to the location information provided by the user terminal, the first relationship table and the second relationship table.

3. The method according to claim 1 or 2, characterized in that The method further comprises: when the satellite node receives a hand-in request from a user terminal, updating the serving user list according to the IP address of the hand-in user terminal.

4. The method according to any one of claims 1 to 3, characterized in that The method further comprises: when the satellite node detects that a user terminal is disconnected, updating the serving user list according to the IP address of the disconnected user terminal.

5. The method according to any one of claims 1 to 4, characterized in that The method further includes: when the satellite node detects that its communication coverage has changed, updating the serving area list according to the current location information of the communication coverage and the first relationship table.

6. The method according to any one of claims 1 to 5, characterized in that The method further includes: when the satellite node detects that its communication coverage has changed, updating the list of users being served by the neighboring node according to the current location information of the communication coverage and the first relationship table.

7. The method according to claim 6, characterized in that When the satellite node detects that its communication coverage has changed, updating the serving area list according to the current location information of the communication coverage and the first relationship table includes: When the satellite node detects that its communication coverage has changed, searching for an identifier of a logical area within the current communication coverage according to the location information of the current communication coverage and the first relationship table; The serving area list is updated according to the identifier of the logical area within the current communication coverage.

8. The method according to any one of claims 1 to 7, characterized in that The maintaining, in the satellite node, a list of users being served by the neighboring node according to the notification message received by the satellite node from the neighboring node comprises: Determine whether the identifier of the logical area corresponding to the IP address of the user terminal being served by the neighbor node in the notification message is in the service area list of the satellite node; If so, a list of users being served by the neighboring node is maintained at the satellite node according to the IP addresses of the user terminals being served by the neighboring node.

9. The method according to any one of claims 1 to 8, characterized in that The geographical location information of the logical area includes the longitude and latitude of the logical area.

10. The method according to any one of claims 1 to 9, characterized in that The logical regions are multiple non-overlapping logical regions obtained by dividing the earth's surface according to the management requirements of the satellite network operator.

11. The method according to any one of claims 1 to 10, characterized in that The paging message includes the IP address of the destination user terminal and the identifier of the destination logical area; The step of performing routing based on the serving user list, the serving area list, and the neighbor node serving user list of the satellite node when the satellite node receives a paging message sent by a source user terminal or a source gateway comprises: When the satellite node receives a paging message sent by a source user terminal or a source gateway, determining whether the IP address of the destination user terminal is in a serving user list of the satellite node; If yes, the satellite node forwards the paging message to the destination user terminal; If not, determining whether the identifier of the destination logical area is in the list of serving areas of the satellite node; if not, forwarding the paging message according to a preset routing strategy; If yes, then determine whether the IP address of the destination user terminal is in the list of terminals being served by the neighbor node of the satellite node; if yes, then the satellite node forwards the paging message to the neighbor node, and the neighbor node forwards the paging message to the destination user terminal; If not, the paging message is forwarded to the destination user terminal according to the routing strategy corresponding to the constellation orbit type to which the satellite node belongs.

12. The method according to claim 11, characterized in that The forwarding the paging message to the destination user terminal according to the routing strategy corresponding to the constellation orbit type to which the satellite node belongs includes: If the constellation orbit type to which the satellite node belongs is a polar orbit constellation, the paging message is forwarded to the satellite node on the other side of the seam through a cross-polar routing strategy, and the satellite node on the other side of the seam forwards the paging message to the destination user terminal; If the constellation orbit type to which the satellite node belongs is an inclined orbit constellation, the paging message is forwarded across the inclined orbit and the polar orbit to a satellite node on another communication plane, and the satellite node on the other communication plane forwards the paging message to the destination user terminal.

13. A satellite communication device, characterized in that: The satellite communication device implements the mobile switching management method according to any one of claims 1 to 12.

14. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the mobile switching management method according to any one of claims 1 to 12 is implemented.

15. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the mobile switching management method according to any one of claims 1 to 12 is implemented.

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