Method and device for keeping high-altitude network service

Abstract

The invention belongs to the technical field of high-altitude network communication, and discloses a high-altitude network service keeping method, which specifically comprises the following steps: step 1, networking and link establishment, step 2, preprocessing of a disaster recovery module, step 3, preprocessing of a return core network, and step 4, service keeping. Through the technical schemes of networking, link establishment, disaster recovery, backhaul core network preprocessing, service maintenance and the like, the problem that the existing high-altitude base station cannot maintain terminal network connection and service continuity when a backhaul link is interrupted is solved; the fault-tolerant capability and the service continuity are improved by monitoring the link state, interacting information, broadcasting and updating the link information, forwarding signaling and other measures, and the terminal service is ensured to be continuously available when the link is interrupted through flash and broken link processing, so that the conditions that a service cell is out of service and a user cannot access the service cell are avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-altitude network communication, and in particular relates to a method and device for maintaining high-altitude network services. Background Art

[0002] In existing high-altitude network deployment architectures, base stations are typically placed on high-altitude platforms or satellites, relying on wireless communication technologies to establish backhaul links to the ground-based core network, thereby achieving broad geographic coverage and communication service support. However, the core vulnerability of this architecture lies in its high reliance on the stability of the wireless backhaul link. If the wireless backhaul link fails due to factors such as extreme weather conditions, signal attenuation, electromagnetic interference, equipment failure, or human sabotage, the communication bridge between the high-altitude base station and the core network will be directly broken.

[0003] The chain reaction of this communication interruption is rapid and widespread. It will not only cause all terminal devices in the base station coverage area to lose network connection instantly, resulting in the inability to carry out basic services such as voice calls, data transmission, and Internet access, but will also further affect various value-added services and key applications that rely on stable network connections, such as real-time video surveillance, emergency medical services, and intelligent transportation system control, causing serious impacts on social public security, economic development, and personal daily life.

[0004] What is particularly critical is that when the wireless backhaul link fails, the traditional high-altitude base station system lacks an effective self-recovery mechanism and is unable to continue to provide services to terminals in the affected area. This to a certain extent limits the application potential and reliability of high-altitude networks in special scenarios such as responding to natural disasters and covering remote areas.

[0005] In view of this, the present invention innovatively proposes a high-altitude network service continuity assurance method and its supporting device, aiming to solve the service interruption problem caused by the interruption of the wireless backhaul link. Summary of the Invention

[0006] The purpose of the present invention is to provide a method and device for maintaining high-altitude network services to solve the problems raised in the above background technology.

[0007] In order to achieve the above object, the present invention provides the following technical solution: a method for maintaining high-altitude network services, the method specifically comprising: Step 1: Networking and link establishment: Deploy service base stations, disaster recovery modules, backhaul core networks, and backhaul base stations on the high-altitude platform. Deploy backhaul terminals and the service core network on the ground station. Establish connections between the backhaul base stations and the backhaul core network, and then establish connections between the service base stations and the ground service core network, providing network connectivity and service services for ground terminals. Step 2: Disaster recovery module pre-processing: Continuously monitor the backhaul link status to determine whether it is a flash or disconnected link, establish connections with surrounding high-altitude stations and exchange information, broadcast the backhaul link status, update backhaul information, and synchronously forward signaling exchanges between the serving base station and the core network to the backhaul core network; Step 3: Pre-processing in the backhaul core network: In addition to establishing the backhaul link and sending the backhaul data, the backhaul core network also performs pre-processing. Step 4, specific process of business maintenance: If the backhaul link is disconnected, the service base station will maintain the business through timer processing; if the backhaul link is broken, the data will be forwarded to other high-altitude stations or the backhaul core network will be temporarily used as the business core network for processing based on the data connection between this high-altitude station and other high-altitude stations to ensure the continuity of terminal business.

[0008] Preferably, the disaster recovery module preprocessing step further includes: Step 1: Determine the backhaul link interruption duration Tinterrupt that the serving base station needs to tolerate based on the UE access delay on the backhaul link, and notify the serving base station of the duration. Step 2: After the disaster recovery module establishes a connection with the surrounding high-altitude stations, it exchanges simple information to obtain the number of nodes that the shortest data connection between the local high-altitude station and the opposite high-altitude station needs to pass through; Step 3: Broadcast the backhaul link status of the high-altitude station to other high-altitude stations, and broadcast the notification synchronously every time the backhaul link changes; Step 4: Save and update the feedback information of other high-altitude stations to form a high-altitude station feedback status table.

[0009] Preferably, the specific process steps of maintaining the service further include: If the backhaul link is broken and there is a data connection between this high-altitude station and other high-altitude stations, a high-altitude station with a good backhaul status will be selected for interaction, and the backhaul data of this high-altitude station will be transferred to the high-altitude station, and forwarded by its backhaul link; If there is no data connection between this high-altitude station and other high-altitude stations, or a high-altitude station that can forward data cannot be selected, the virtual S1 link maintained by the backhaul core network will be converted into a formal S1 link, and the virtual UE context will be converted into a formal UE context, ensuring that the base station cell will not be deleted and all users will not be disconnected.

[0010] Preferably, the pre-processing of the backhaul core network specifically includes: Step 1: Enter the user information of the ground terminal in the backhaul core network; Step 2: By processing the S1 link management messages forwarded by the disaster recovery module to the backhaul core network, the configuration parameters are automatically modified within the backhaul core network to maintain a virtual backup S1 link. Step 3: By processing the user-related signaling messages forwarded by the disaster recovery module to the backhaul core network, the user context is simultaneously created, modified, and deleted in the backhaul core network, and a virtual backup user context is maintained in the backhaul core network.

[0011] Preferably, the high-altitude network service maintenance device consists of three parts: a networking and link establishment module, a disaster recovery module, a pre-processing module, and a service maintenance module; The networking and link establishment module is used to deploy the service base station, disaster recovery module, backhaul core network and backhaul base station on the high-altitude platform, deploy the backhaul terminal and service core network on the ground station, establish the connection between the backhaul base station and the backhaul core network, and then establish the connection between the service base station and the ground service core network; The disaster recovery module pre-processing module is used to continuously monitor the backhaul link status, determine whether it is a flash disconnect or a link failure, establish connections with surrounding high-altitude stations and exchange information, broadcast the backhaul link status, update the backhaul information, and synchronously forward the signaling interaction between the serving base station and the core network to the backhaul core network; The service maintenance module is used to maintain the service through timer processing when the backhaul link is disconnected; when the backhaul link is broken, according to the data connection between the current high-altitude station and other high-altitude stations, it is selected to forward the data to other high-altitude stations or to have the backhaul core network temporarily used as the service core network for processing to ensure the continuity of terminal services.

[0012] Preferably, the disaster recovery module preprocessing module further includes: A unit for determining, based on the UE access delay on the backhaul link, the backhaul link interruption duration Tinterrupt that the serving base station needs to tolerate, and notifying the serving base station of the duration; After establishing a connection with the surrounding high-altitude stations, it exchanges simple information and obtains the number of nodes that the shortest data connection between the current high-altitude station and the opposite high-altitude station needs to pass through; A unit used to broadcast the return link status of the high-altitude station to other high-altitude stations and synchronize the broadcast notification every time the return link changes; A unit used to save and update the feedback information of other high-altitude stations to form a high-altitude station feedback status table.

[0013] Preferably, the service maintaining module further includes: When the backhaul link is broken and there is a data connection between the current high-altitude station and other high-altitude stations, a unit is selected to interact with a high-altitude station with a good backhaul status, and the backhaul data of the current high-altitude station is transmitted to the high-altitude station for forwarding by its backhaul link. It is used to convert the virtual S1 link maintained by the backhaul core network into a formal S1 link and the virtual UE context into a formal UE context when there is no data connection between this high-altitude station and other high-altitude stations, or when a high-altitude station that can forward data cannot be selected, to ensure that the base station cell will not be deleted and all users will not be disconnected.

[0014] Preferably, the device for maintaining high-altitude network services is composed of multiple high-altitude stations, and the disaster recovery modules of each high-altitude station are connected via wireless connections; the backhaul link of each high-altitude station is established in the same way.

[0015] The beneficial effects of the present invention are as follows: The present invention effectively solves the problem that existing high-altitude base stations cannot maintain terminal network connection and business continuity in the event of a backhaul link interruption through technical solutions in multiple aspects such as networking and link establishment, disaster recovery module pre-processing, backhaul core network pre-processing, and specific business maintenance processes. By continuously monitoring the backhaul link status, judging flash disconnection or link breakage, exchanging information with surrounding high-altitude stations, broadcasting the backhaul link status, updating backhaul information, and synchronous signaling forwarding, the fault tolerance and business continuity of the high-altitude base station are improved. At the same time, through the specific processes of flash disconnection processing and link break processing, the continuous availability of terminal services in the event of a backhaul link interruption is ensured, avoiding the problem of service cell decommissioning and massive user inaccessibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a network structure diagram of the high-altitude platform of the present invention; Figure 2 A network diagram of multiple high-altitude stations of the present invention; Figure 3 This is the data forwarding path diagram for the return transmission of the present invention; Figure 4 This is a diagram of the business processing in the high-altitude station of the present invention; Figure 5 This is a diagram of other high-altitude station business processing in the present invention; Figure 6 This is a topological diagram of the connections between high-altitude stations of the present invention. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] like Figures 1 to 6As shown, an embodiment of the present invention provides a method for maintaining high-altitude network services, and the method specifically includes: Step 1: Networking and link establishment: Deploy service base stations, disaster recovery modules, backhaul core networks, and backhaul base stations on the high-altitude platform. Deploy backhaul terminals and the service core network on the ground station. Establish connections between the backhaul base stations and the backhaul core network, and then establish connections between the service base stations and the ground service core network, providing network connectivity and service services for ground terminals. The present invention describes a network structure including base station network elements, core network elements, and a network structure such as Figure 1 shown.

[0019] The service base station, disaster recovery module, backhaul core network and backhaul base station are deployed on the high-altitude platform; the service base station provides network connection for the ground terminal, the backhaul core network and backhaul base station provide network connection for the backhaul link, and the disaster recovery module backs up the business.

[0020] Backhaul terminals and business core networks are deployed on the ground station. The backhaul terminals establish connections with the base stations / core networks on the high-altitude platforms to send and receive data on the backhaul links, while the business core network provides business services to the ground terminals.

[0021] When the high-altitude platform system is started, the first step is to establish a connection between the backhaul base station and the backhaul core network. After the backhaul base station starts normally and the cell is established, the coverage range is directed to the ground station. The backhaul terminal at the ground station initiates the connection establishment and accesses the backhaul base station and the backhaul core network in the air. At this time, the backhaul terminal and the backhaul base station / backhaul core network can send and receive uplink and downlink data, which can serve as the backhaul link of the high-altitude platform system.

[0022] Then the service base station on the high-altitude platform system is started, a link is established with the ground business core network, and a cell is established normally. The interactive data between the service base station and the ground core network are all transmitted through the above-mentioned backhaul link, that is, they are transmitted as business data of the ground backhaul terminal.

[0023] After the service base station cell on the high-altitude platform system is in service, it can provide coverage and services to ground terminals.

[0024] Multiple high-altitude stations form a network such as Figure 2 shown.

[0025] A wireless connection is established between the disaster recovery module of high-altitude station A and the disaster recovery module of high-altitude station B; The method for establishing the backhaul link of high-altitude station B is the same as that for establishing the backhaul link of high-altitude station A.

[0026] Step 2: Disaster recovery module pre-processing: Continuously monitor the backhaul link status to determine whether it is a flash or disconnected link, establish connections with surrounding high-altitude stations and exchange information, broadcast the backhaul link status, update backhaul information, and synchronously forward signaling exchanges between the serving base station and the core network to the backhaul core network; Disaster recovery module preprocessing 1. In the above process, after the return link of each high-altitude station is established, the disaster recovery module of each high-altitude station will continuously monitor whether the return link is broken.

[0027] 2. Determine the flash disconnection: Detect whether the backhaul link is broken. To eliminate the flash disconnection, the disaster recovery module determines the backhaul link interruption duration Tinterrupt that the serving base station needs to tolerate based on the UE access delay on the backhaul link, and notifies the serving base station of the duration. If the backhaul link interruption duration exceeds Tinterrupt, the backhaul link is considered broken. If it does not exceed Tinterrupt, the backhaul link is considered to be flash disconnected.

[0028] 3. The high-altitude station disaster recovery module will establish a connection with the surrounding high-altitude stations. After the connection is established, simple information is exchanged to obtain the number of nodes that the shortest data connection between the current high-altitude station and the opposite high-altitude station needs to pass through.

[0029] 4. The disaster recovery module broadcasts the return link status of this high-altitude station to other high-altitude stations; and every time the return link of this high-altitude station changes, it broadcasts the status to other high-altitude stations simultaneously.

[0030] 5. After receiving the broadcast from other high-altitude station disaster recovery modules, the high-altitude station disaster recovery module saves and updates the return information of the station to form a high-altitude station return status table.

[0031] 6. The disaster recovery module synchronously forwards the signaling interactions between the serving base station and the core network to the backhaul core network, which then processes the information. For example, the disaster recovery module synchronously forwards the uplink and downlink signaling messages establishing a connection between the serving base station and the service core network to the backhaul core network. When a ground terminal accesses the service core network, the disaster recovery module also synchronously forwards all uplink and downlink signaling messages on the S1 port to the backhaul core network.

[0032] Step 3: Pre-processing in the backhaul core network: In addition to establishing the backhaul link and sending the backhaul data, the backhaul core network also performs pre-processing. Pre-processing of the backhaul core network In addition to establishing the backhaul link and sending the backhaul data, the backhaul core network also performs the following pre-processing actions.

[0033] 1. The backhaul core network has user information of ground terminals; 2. Process the S1 link management messages forwarded by the disaster recovery module to the backhaul core network, and automatically modify the configuration parameters within the backhaul core network to maintain a virtual backup S1 link; 3. Process user-related signaling messages forwarded by the disaster recovery module to the backhaul core network, simultaneously create, modify, and delete user contexts in the backhaul core network, and maintain a virtual backup user context in the backhaul core network.

[0034] Step 4, specific process of business maintenance: If the backhaul link is disconnected, the service base station will maintain the business through timer processing; if the backhaul link is broken, the data will be forwarded to other high-altitude stations or the backhaul core network will be temporarily used as the business core network for processing based on the data connection between this high-altitude station and other high-altitude stations to ensure the continuity of terminal business.

[0035] Business maintenance specific process 1. If the high-altitude station's backhaul link is temporarily disconnected, the serving base station will maintain the service. This is achieved through timer processing at the service level. For example, upon receiving an SCTP link disconnection, a separate timer with a duration of Tinterrupt is started. If the link is not restored after the timer expires, the service considers the serving base station's backhaul link to be disconnected. If the link is restored before the timer expires, the base station service is not affected. In addition, the timer related to user service backhaul needs to be extended.

[0036] 2. If the return link of the high-altitude station is broken and there is data connection between this high-altitude station and other high-altitude stations, the disaster recovery module will perform the following actions: 1) Update the backhaul link status of this station, broadcast it, and notify other high-altitude stations; 2) Synchronously select a high-altitude station with good return status in the high-altitude station return status table, interact with the high-altitude station, and determine to pass the return data of this high-altitude station to the high-altitude station, which will be forwarded by the return link of the high-altitude station. The selection of the high-altitude station needs to select the high-altitude station with the least number of nodes connected to the high-altitude station to avoid excessive forwarding. Figure 3 shown.

[0037] 3. If there is no data connection between this high-altitude station and other high-altitude stations, or if a high-altitude station that can forward data cannot be selected, the disaster recovery module performs the following actions: 1) All signaling messages between the base station and the serving core network are forwarded to the backhaul core network. The virtual S1 link maintained by the backhaul core network is converted into a formal S1 link, and the virtual UE context is converted into a formal UE context, ensuring that base station cells are not deleted and all users are not disconnected. 2) When the terminal has a data service, the backhaul core network determines the scope of the service interaction object: (1) If the business interaction object is within the coverage of this high-altitude station, it can be processed directly within this high-altitude station, such as Figure 4 As shown; (2) If the business interaction object belongs to the coverage of other high-altitude stations, if there is a connection between this high-altitude station and the high-altitude station, it can interact with the other high-altitude station to perform business processing, such as Figure 5 As shown; (3) If the business interaction object is within the coverage of another high-altitude station, but there is no connection between this high altitude and that high-altitude station, the business cannot be processed.

[0038] The disaster recovery module preprocessing step further includes: Step 1: Determine the backhaul link interruption duration Tinterrupt that the serving base station needs to tolerate based on the UE access delay on the backhaul link, and notify the serving base station of the duration. Step 2: After the disaster recovery module establishes a connection with the surrounding high-altitude stations, it exchanges simple information to obtain the number of nodes that the shortest data connection between the local high-altitude station and the opposite high-altitude station needs to pass through; Step 3: Broadcast the backhaul link status of the high-altitude station to other high-altitude stations, and broadcast the notification synchronously every time the backhaul link changes; Step 4: Save and update the feedback information of other high-altitude stations to form a high-altitude station feedback status table.

[0039] The specific steps of the service maintenance process further include: If the backhaul link is broken and there is a data connection between this high-altitude station and other high-altitude stations, a high-altitude station with a good backhaul status will be selected for interaction, and the backhaul data of this high-altitude station will be transferred to the high-altitude station, and forwarded by its backhaul link; If there is no data connection between this high-altitude station and other high-altitude stations, or a high-altitude station that can forward data cannot be selected, the virtual S1 link maintained by the backhaul core network will be converted into a formal S1 link, and the virtual UE context will be converted into a formal UE context, ensuring that the base station cell will not be deleted and all users will not be disconnected.

[0040] The pre-processing of the backhaul core network specifically includes: Step 1: Enter the user information of the ground terminal in the backhaul core network; Step 2: By processing the S1 link management messages forwarded by the disaster recovery module to the backhaul core network, the configuration parameters are automatically modified within the backhaul core network to maintain a virtual backup S1 link. Step 3: By processing the user-related signaling messages forwarded by the disaster recovery module to the backhaul core network, the user context is simultaneously created, modified, and deleted in the backhaul core network, and a virtual backup user context is maintained in the backhaul core network.

[0041] Among them, the high-altitude network service maintenance device consists of three parts: networking and link establishment module, disaster recovery module pre-processing module, and service maintenance module; The networking and link establishment module is used to deploy the service base station, disaster recovery module, backhaul core network and backhaul base station on the high-altitude platform, deploy the backhaul terminal and service core network on the ground station, establish the connection between the backhaul base station and the backhaul core network, and then establish the connection between the service base station and the ground service core network; The disaster recovery module pre-processing module is used to continuously monitor the backhaul link status, determine whether it is a flash disconnect or a link failure, establish connections with surrounding high-altitude stations and exchange information, broadcast the backhaul link status, update the backhaul information, and synchronously forward the signaling interaction between the serving base station and the core network to the backhaul core network; The service maintenance module is used to maintain the service through timer processing when the backhaul link is disconnected; when the backhaul link is broken, according to the data connection between the current high-altitude station and other high-altitude stations, it is selected to forward the data to other high-altitude stations or to have the backhaul core network temporarily used as the service core network for processing to ensure the continuity of terminal services.

[0042] The disaster recovery module preprocessing module further includes: A unit for determining, based on the UE access delay on the backhaul link, the backhaul link interruption duration Tinterrupt that the serving base station needs to tolerate, and notifying the serving base station of the duration; After establishing a connection with the surrounding high-altitude stations, it exchanges simple information and obtains the number of nodes that the shortest data connection between the current high-altitude station and the opposite high-altitude station needs to pass through; A unit used to broadcast the return link status of the high-altitude station to other high-altitude stations and synchronize the broadcast notification every time the return link changes; A unit used to save and update the feedback information of other high-altitude stations to form a high-altitude station feedback status table.

[0043] The service maintenance module further includes: When the backhaul link is broken and there is a data connection between the current high-altitude station and other high-altitude stations, a unit is selected to interact with a high-altitude station with a good backhaul status, and the backhaul data of the current high-altitude station is transmitted to the high-altitude station for forwarding by its backhaul link. It is used to convert the virtual S1 link maintained by the backhaul core network into a formal S1 link and the virtual UE context into a formal UE context when there is no data connection between this high-altitude station and other high-altitude stations, or when a high-altitude station that can forward data cannot be selected, to ensure that the base station cell will not be deleted and all users will not be disconnected.

[0044] Among them, the device for maintaining high-altitude network services is composed of multiple high-altitude stations, and the disaster recovery modules of each high-altitude station are established through wireless connections; the backhaul link of each high-altitude station is established in the same way.

[0045] Example 1: After the ground backhaul terminal establishes a connection with the backhaul base station of the high-altitude station, the uplink and downlink backhaul data transmission test begins. The delay of the uplink and downlink loopback service data between the backhaul core network and the backhaul terminal is calculated, assuming the maximum transmission delay Tdelay.

[0046] The base station obtains the time Tdelay and assumes that the internal flash detection timer is set to Tdelay*(1+riv%)*N_heart, where riv% represents the margin allowed for each loopback and N_heart represents the number of SCTP heartbeat detections.

[0047] When the base station detects that the SCTP connection between it and the ground service core network is disconnected, it starts the flash disconnect detection timer. If the base station and the ground service core network are restored before the flash disconnect detection timer expires, the timer is turned off and the link is considered to be flash disconnected and the service is restored. If the connection is not restored, the link is considered to be broken and the disaster recovery module starts the disaster recovery action.

[0048] Example 2: Interaction between disaster recovery modules at different high-altitude stations.

[0049] When the high-altitude station is started, the disaster recovery module will establish a connection with the surrounding high-altitude stations. The connection method can be as follows: Figure 6 shown.

[0050] There is a direct wireless connection between high-altitude station A and high-altitude stations B / C / D, that is, the transmission from high-altitude station A to these stations passes through one node. High-altitude stations C and E have a direct connection, and high-altitude stations D and G have a direct connection. Then the transmission between A and E / G passes through 2 nodes. Similarly, the number of nodes transmitted between A and F / H is at least 3.

[0051] Each high-altitude station stores its current connection topology. When A establishes a connection with C, C updates its own topology and then broadcasts it. This allows each station to obtain the latest topology and the number of nodes interacting with it.

[0052] At the same time, each high-altitude station will save the return link status of its own station. If the return link status changes, it will also be broadcast through a broadcast message.

[0053] Example 3: If the backhaul link of the high-altitude station is broken, the disaster recovery module starts looking for a high-altitude station that can perform backhaul forwarding. Specifically, it uses the aforementioned high-altitude base station topology and the backhaul link status of the high-altitude station to find a shortest path for backhaul data forwarding, and transmits the backhaul data of the high-altitude station back to the ground core network through this path.

[0054] In the process of selecting the shortest path, the load of each path in the topology can also be considered, and the path with the lighter load can be selected for forwarding.

[0055] Example 4: When the high-altitude station is not disconnected, the backhaul disaster recovery module will send the base station's messages and user-related messages to the backhaul core network, and the backhaul core network will simultaneously create user context and other information as a backup.

[0056] If a suitable backhaul link cannot be selected, the backhaul core network is temporarily activated as the service core network. Since the backhaul core network stores user context information, users will not be disconnected.

[0057] Within the coverage of the backhaul core network (or within the coverage of other high-altitude stations with wireless connections to this station), business data can still be exchanged normally between terminals.

[0058] Example 5: For the interface between the high-altitude station disaster recovery modules, please refer to the following interface parameters.

[0059] { Feeder link status of this high-altitude station; The feeder load status of this high-altitude station; The topological structure diagram currently available for backhaul and forwarding saved by this high-altitude station; The information of each high-altitude station node in the topology diagram includes: { The feeder link status of each high-altitude station node in the topology diagram; The feeding load status of each high-altitude station node in the topology diagram; } } When the disaster recovery module of each high-altitude station is started, it will obtain the current network topology information from the surrounding stations, then update the topology information, and broadcast the latest topology information to notify the surrounding high-altitude stations.

[0060] The high-altitude station saves the latest topology information and can calculate whether the feeder link of each high-altitude station node in the topology is broken and the load situation based on the new topology information and select the appropriate return link.

[0061] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0062] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for maintaining high-altitude network services, characterized by: The high-altitude network service maintenance method specifically includes: Step 1: Networking and link establishment: Deploy service base stations, disaster recovery modules, backhaul core networks, and backhaul base stations on the high-altitude platform. Deploy backhaul terminals and the service core network on the ground station. Establish connections between the backhaul base stations and the backhaul core network, and then establish connections between the service base stations and the ground service core network, providing network connectivity and service services for ground terminals. Step 2: Disaster recovery module pre-processing: Continuously monitor the backhaul link status to determine whether it is a flash or disconnected link, establish connections with surrounding high-altitude stations and exchange information, broadcast the backhaul link status, update backhaul information, and synchronously forward signaling exchanges between the serving base station and the core network to the backhaul core network; Step 3: Pre-processing in the backhaul core network: In addition to establishing the backhaul link and sending the backhaul data, the backhaul core network also performs pre-processing. Step 4, specific process of business maintenance: If the backhaul link is disconnected, the service base station will maintain the business through timer processing; if the backhaul link is broken, the data will be forwarded to other high-altitude stations or the backhaul core network will be temporarily used as the business core network for processing based on the data connection between this high-altitude station and other high-altitude stations to ensure the continuity of terminal business.

2. The method for maintaining high-altitude network services according to claim 1, wherein: The disaster recovery module preprocessing step further includes: Step 1: Determine the backhaul link interruption duration Tinterrupt that the serving base station needs to tolerate based on the UE access delay on the backhaul link, and notify the serving base station of the duration. Step 2: After the disaster recovery module establishes a connection with the surrounding high-altitude stations, it exchanges simple information to obtain the number of nodes that the shortest data connection between the local high-altitude station and the opposite high-altitude station needs to pass through; Step 3: Broadcast the backhaul link status of the high-altitude station to other high-altitude stations, and broadcast the notification synchronously every time the backhaul link changes; Step 4: Save and update the feedback information of other high-altitude stations to form a high-altitude station feedback status table.

3. The method for maintaining high-altitude network services according to claim 1, wherein: The specific process steps of maintaining the service also include: If the backhaul link is broken and there is a data connection between this high-altitude station and other high-altitude stations, a high-altitude station with a good backhaul status will be selected for interaction, and the backhaul data of this high-altitude station will be transferred to the high-altitude station, and forwarded by its backhaul link; If there is no data connection between this high-altitude station and other high-altitude stations, or a high-altitude station that can forward data cannot be selected, the virtual S1 link maintained by the backhaul core network will be converted into a formal S1 link, and the virtual UE context will be converted into a formal UE context, ensuring that the base station cell will not be deleted and all users will not be disconnected.

4. The method for maintaining high-altitude network services according to claim 1, wherein: The pre-processing of the backhaul core network specifically includes: Step 1: Enter the user information of the ground terminal in the backhaul core network; Step 2: By processing the S1 link management messages forwarded by the disaster recovery module to the backhaul core network, the configuration parameters are automatically modified within the backhaul core network to maintain a virtual backup S1 link. Step 3: By processing the user-related signaling messages forwarded by the disaster recovery module to the backhaul core network, the user context is simultaneously created, modified, and deleted in the backhaul core network, and a virtual backup user context is maintained in the backhaul core network.

5. A device for maintaining high-altitude network services, characterized by: The high-altitude network service maintenance device consists of three parts: networking and link establishment module, disaster recovery module pre-processing module, and service maintenance module; The networking and link establishment module is used to deploy the service base station, disaster recovery module, backhaul core network and backhaul base station on the high-altitude platform, deploy the backhaul terminal and service core network on the ground station, establish the connection between the backhaul base station and the backhaul core network, and then establish the connection between the service base station and the ground service core network; The disaster recovery module pre-processing module is used to continuously monitor the backhaul link status, determine whether it is a flash disconnect or a link failure, establish connections with surrounding high-altitude stations and exchange information, broadcast the backhaul link status, update the backhaul information, and synchronously forward the signaling interaction between the serving base station and the core network to the backhaul core network; The service maintenance module is used to maintain the service through timer processing when the backhaul link is disconnected; when the backhaul link is broken, according to the data connection between the current high-altitude station and other high-altitude stations, it is selected to forward the data to other high-altitude stations or to have the backhaul core network temporarily used as the service core network for processing to ensure the continuity of terminal services.

6. The device for maintaining high-altitude network services according to claim 5, characterized in that: The disaster recovery module preprocessing module also includes: A unit for determining, based on the UE access delay on the backhaul link, the backhaul link interruption duration Tinterrupt that the serving base station needs to tolerate, and notifying the serving base station of the duration; After establishing a connection with the surrounding high-altitude stations, it exchanges simple information and obtains the number of nodes that the shortest data connection between the current high-altitude station and the opposite high-altitude station needs to pass through; A unit used to broadcast the return link status of the high-altitude station to other high-altitude stations and synchronize the broadcast notification every time the return link changes; A unit used to save and update the feedback information of other high-altitude stations to form a high-altitude station feedback status table.

7. The method and apparatus for maintaining high-altitude network services according to claim 1, characterized in that: The service maintenance module also includes: When the backhaul link is broken and there is a data connection between the current high-altitude station and other high-altitude stations, a unit is selected to interact with a high-altitude station with a good backhaul status, and the backhaul data of the current high-altitude station is transmitted to the high-altitude station for forwarding by its backhaul link. It is used to convert the virtual S1 link maintained by the backhaul core network into a formal S1 link and the virtual UE context into a formal UE context when there is no data connection between this high-altitude station and other high-altitude stations, or when a high-altitude station that can forward data cannot be selected, to ensure that the base station cell will not be deleted and all users will not be disconnected.

8. The device for maintaining high-altitude network services according to claim 1, characterized in that: The device for maintaining high-altitude network services is composed of multiple high-altitude stations, and the disaster recovery modules of each high-altitude station are connected via wireless connections; the backhaul link of each high-altitude station is established in the same way.

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