Multifunctional satellite store-and-forward communication method for random access

Abstract

The invention discloses a random access multifunctional satellite storage and forwarding communication method, and belongs to the field of satellite communication. From the perspective of solving the problem that an NGSO constellation system can only provide limited communication services at the initial stage of deployment, the invention provides a satellite storage and forwarding communication method combining satellite data storage and forwarding and ground user terminal random access. The method helps to solve the problems of few constellation communication service functions and low resource utilization rate under the condition that the number of satellites in the initial stage of deployment of the NGSO constellation system is insufficient, provides an idea for fully utilizing NGSO constellation system resources, and provides multiple user service functions for random access user terminals. And the application mode of the NGSO satellite is further expanded.

Description

Technical Field

[0001] This invention designs a multifunctional satellite store-and-forward communication method with on-demand access, belonging to the field of satellite communication. Background Technology

[0002] Geostationary satellites can provide routine coverage and real-time communication services. However, for satellites in IGSO, MEO, and LEO orbits, which are in dynamic motion relative to the Earth, a single satellite cannot provide continuous communication services to a specific target. Regular service can only be guaranteed after the entire constellation is deployed; before that, the constellation can only provide limited communication services. Building upon this, store-and-forward technology can enhance the constellation's service capabilities and resource utilization. Currently, existing satellite store-and-forward technologies focus on the methods and processes for implementing store-and-forward, lacking design for the user service functions that can be provided. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the aforementioned background technology and provide a multifunctional satellite store-and-forward communication method with on-demand access. This invention provides users with various user service functions, including user management, file resume download, and automatic file deletion, thus expanding the application possibilities of NGSO satellites.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A multi-functional satellite store-and-forward communication method with on-demand access is implemented based on a ground control center, gateway station, user terminal, and satellite. The satellite components include a store-and-forward system, an onboard switching unit, and a payload monitoring unit. The method specifically includes the following steps: (1) The ground control center, user terminal and satellite respectively complete the preset operations of satellite power-on range, satellite route and user terminal backhaul route; (2) The ground control center plans the user whitelist and updates the whitelist information to the satellite through the gateway station; (3) After reaching the satellite's power-on range, the user terminal sends a network access and beam resource application to the satellite through the signaling beam according to the service transmission requirements, and receives the satellite's network access and beam resource application results; (4) The user terminal analyzes the received network access and beam resource application results. If the network access is successful and beam resources are applied for, then step (5) is executed; if the network access is unsuccessful or beam resources are not applied for, then step (3) is returned. (5) The ground control center, gateway station, satellite, transmitting user terminal and receiving user terminal work together to complete the storage and forwarding of files and user management, file interruption resume and file automatic deletion.

[0005] Furthermore, the presets in step (1) are as follows: The ground control center plans the mission based on the location of the user terminal and determines the satellite activation range; Pre-configured satellite routing in the user terminal; User terminal backhaul routes are pre-configured within the onboard switching unit.

[0006] Furthermore, the specific process of step (2) is as follows: (2-1) The ground operation control center plans a whitelist of user terminals, which includes the user terminal number and the service port IP address; (2-2) When the gateway station and satellite are visible, the ground operation and control center will upload the user terminal whitelist to the satellite via the power supply link through the gateway station.

[0007] Furthermore, the specific process of step (3) is as follows: (3-1) The user terminal is on duty in the signaling beam to receive downlink broadcast information; (3-2) The user terminal sends a network access and beam resource application to the satellite through the signaling beam and the preset satellite route. The application information includes the user terminal number, location information and the requested beam resource information. (3-3) After receiving the user terminal’s network access and beam resource application, the payload monitoring unit performs a whitelist comparison. If the user terminal number is in the whitelist, it queries the onboard switching unit for the user terminal’s backhaul route and returns a successful network access application response to the user terminal through the queried user terminal backhaul route. Then, it continues to execute step (3-4). If the user terminal number is not in the whitelist, it rejects the user terminal’s network access application. (3-4) After the user terminal successfully joins the network, the load monitoring unit analyzes the received beam resource application information and the currently available beam resource information, and feeds back the beam resource allocation results to the user terminal.

[0008] Furthermore, the specific process of storing and forwarding files in step (5) is as follows: (5-1) After the ground control center receives the information from the payload monitoring unit that the transmitting user terminal has successfully joined the network and applied for beam resources through the gateway station, it then sends data storage and forwarding instructions and receives user terminal information to the store and forward system through the gateway station. (5-2) The store-and-forward system receives and parses the received data storage and forwarding instructions and the receiving user terminal information, and generates a file receiving instruction; (5-3) The transmitting user terminal uploads the data file to be forwarded to the satellite's store-and-forward system through the allocated user beam resources; (5-4) After receiving the data file uploaded by the sending user terminal, the store-and-forward system performs storage operations and continuously monitors the network access and beam resource application status of the receiving user terminal through the load monitoring unit. (5-5) After the payload monitoring unit monitors the status information of the receiving user terminal successfully joining the network and applying for beam resources, it forwards the monitored status information and the backhaul route of the receiving user terminal obtained from the on-board switching unit to the store-and-forward system. The store-and-forward system then sends the file receiving instruction generated in step (5-2) to the receiving user terminal through the satellite-to-ground signaling beam and the backhaul route of the receiving user terminal. (5-6) After receiving the file receiving instruction sent by the store-and-forward system, the receiving user terminal parses the instruction and then returns the file transfer request to the store-and-forward system through the signaling beam and the preset satellite route; (5-7) After receiving the file transfer request returned by the receiving user terminal, the store-and-forward system sends the stored data file to the receiving user terminal to complete the file transfer process.

[0009] Compared with the prior art, the present invention has the following advantages: This invention designs a multifunctional satellite store-and-forward communication method with on-demand access. It can flexibly apply for service point beams for communication through a signaling beam with a wide coverage area, supports multiple concurrent users, and has multiple user-oriented functions such as user management, file breakpoint resume, and automatic file deletion. Attached Figure Description

[0010] Figure 1 This is a flowchart of an embodiment of the present invention.

[0011] Figure 2 This is a schematic diagram illustrating the application scenario of the present invention. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be further described below with reference to the accompanying drawings and a more specific example: A multi-functional satellite store-and-forward communication method for on-demand access is proposed. This method is suitable for scenarios where the user terminal's location is known and it randomly initiates a network access request. Application scenarios include... Figure 2 As shown, this method is implemented based on a ground control center, gateway station, user terminal, and satellite. The satellite components include a store-and-forward system, an onboard switching unit, and a payload monitoring unit. The specific implementation steps of this method are as follows: Figure 1 As shown, it includes the following steps: (1) The ground control center, user terminal and satellite respectively complete the preset operations of satellite power-on range, satellite route and user terminal return route.

[0013] (2) The ground control center plans the whitelist of user terminals in advance, and when the gateway station and satellite are visible, the whitelist information of the user terminals is synchronously updated and uploaded to the satellite through the power supply link via the gateway station.

[0014] (3) After reaching the satellite's power-on range, the user terminal sends a network access and beam resource application to the satellite through the signaling beam according to the service transmission requirements, and receives the satellite's network access and beam resource application results; The specific process of step (3) is as follows: (3-1) The user terminal is on duty in the signaling beam to receive downlink broadcast information; (3-2) The user terminal sends a network access and beam resource application to the satellite through the signaling beam and the preset satellite route. The application information includes the user terminal number, location information and the requested beam resource information. (3-3) After receiving the user terminal’s network access and beam resource application, the payload monitoring unit performs a whitelist comparison. If the user terminal number is in the whitelist, it queries the onboard switching unit for the user terminal’s backhaul route and returns a successful network access application response to the user terminal through the queried user terminal backhaul route. Then, it continues to execute step (3-4). If the user terminal number is not in the whitelist, it rejects the user terminal’s network access application. (3-4) After the user terminal successfully joins the network, the load monitoring unit analyzes the received beam resource application information and the currently available beam resource information, and feeds back the beam resource allocation results to the user terminal.

[0015] (4) The user terminal analyzes the received network access and beam resource application results. If the network access is successful and beam resources are applied for, then step (5) is executed; if the network access is unsuccessful or beam resources are not applied for, then step (3) is returned.

[0016] (5) The ground control center, gateway station, satellite, transmitting user terminal and receiving user terminal work together to complete the storage and forwarding of files and user management, file interruption resume and file automatic deletion.

[0017] The specific process of storing and forwarding files is as follows: (5-1) After the ground control center receives the information from the payload monitoring unit that the transmitting user terminal has successfully joined the network and applied for beam resources through the gateway station, it then sends data storage and forwarding instructions and receives user terminal information to the store and forward system through the gateway station. (5-2) The store-and-forward system receives and parses the received data storage and forwarding instructions and the receiving user terminal information, and generates a file receiving instruction; (5-3) The transmitting user terminal uploads the data file to be forwarded to the satellite's store-and-forward system through the allocated user beam resources; (5-4) After receiving the data file uploaded by the sending user terminal, the store-and-forward system performs storage operations and continuously monitors the network access and beam resource application status of the receiving user terminal through the load monitoring unit. (5-5) After the payload monitoring unit monitors the status information of the receiving user terminal successfully joining the network and applying for beam resources, it forwards the monitored status information and the backhaul route of the receiving user terminal obtained from the on-board switching unit to the store-and-forward system. The store-and-forward system then sends the file receiving instruction generated in step (5-2) to the receiving user terminal through the satellite-to-ground signaling beam and the backhaul route of the receiving user terminal. (5-6) After receiving the file receiving instruction sent by the store-and-forward system, the receiving user terminal parses the instruction and then returns the file transfer request to the store-and-forward system through the signaling beam and the preset satellite route; (5-7) After receiving the file transfer request from the receiving user terminal, the store-and-forward system sends the stored data file to the receiving user terminal to complete the file transfer process; In some cases, because the file being sent was quite large, the entire file was not transmitted while the satellite and the receiving user terminal were still visible. When the receiving user terminal and the satellite became visible again in the next orbit, the store-and-forward system performed a resume operation to continue transmitting the entire file.

[0018] During file transfer, other functions for users can be executed according to the specific requirements uploaded by the ground control center. For example, the file transfer can be stopped, and an instruction to automatically delete the received file can be sent to the receiving end. Alternatively, the user information of receiving user terminal 1 can be deleted from the whitelists of both the ground control center and the on-board payload monitoring unit, and the user information of receiving user terminal 2 can be added to the whitelists of both the ground control center and the on-board payload monitoring unit.

[0019] This invention addresses the issue of limited communication services provided by the NGSO constellation system in its initial deployment phase. It proposes a multifunctional satellite store-and-forward communication method that combines onboard data storage and forwarding with on-demand access from ground user terminals. This method helps to solve the problems of limited constellation communication service functions and low resource utilization when the number of satellites is insufficient in the early stages of NGSO constellation system deployment. It provides a new approach to fully utilize the resources of the NGSO constellation system and further expands the application methods of NGSO satellites.

Claims

1. A multi-functional satellite store-and-forward communication method with on-demand access, characterized in that, Based on ground control centers, gateway stations, user terminals, and satellites, the satellite components include a store-and-forward system, an onboard switching unit, and a payload monitoring unit, specifically including the following steps: (1) The ground control center, user terminal and satellite respectively complete the preset operations of satellite power-on range, satellite route and user terminal backhaul route; (2) The ground control center plans the user whitelist and updates the whitelist information to the satellite through the gateway station; (3) After reaching the satellite's power-on range, the user terminal sends a network access and beam resource application to the satellite through the signaling beam according to the service transmission requirements, and receives the satellite's network access and beam resource application results; (4) The user terminal analyzes the received network access and beam resource application results. If the network access is successful and beam resources are applied for, then step (5) is executed; if the network access is unsuccessful or beam resources are not applied for, then step (3) is returned. (5) The ground control center, gateway station, satellite, transmitting user terminal and receiving user terminal work together to complete the storage and forwarding of files and user management, file interruption resume and file automatic deletion.

2. The multi-functional satellite store-and-forward communication method with on-demand access according to claim 1, characterized in that, The presets in step (1) are as follows: The ground control center plans the mission based on the location of the user terminal and determines the satellite activation range; Pre-configured satellite routing in the user terminal; User terminal backhaul routes are pre-configured within the onboard switching unit.

3. The multi-functional satellite store-and-forward communication method with on-demand access according to claim 1, characterized in that, The specific process of step (2) is as follows: (2-1) The ground operation control center plans a whitelist of user terminals, which includes the user terminal number and the service port IP address; (2-2) When the gateway station and satellite are visible, the ground operation and control center will upload the user terminal whitelist to the satellite via the power supply link through the gateway station.

4. The multi-functional satellite store-and-forward communication method with on-demand access according to claim 1, characterized in that, The specific process of step (3) is as follows: (3-1) The user terminal is on duty in the signaling beam to receive downlink broadcast information; (3-2) The user terminal sends a network access and beam resource application to the satellite through the signaling beam and the preset satellite route. The application information includes the user terminal number, location information and the requested beam resource information. (3-3) After receiving the user terminal’s network access and beam resource application, the payload monitoring unit performs a whitelist comparison. If the user terminal number is in the whitelist, it queries the onboard switching unit for the user terminal’s backhaul route and returns a successful network access application response to the user terminal through the queried user terminal backhaul route. Then, it continues to execute step (3-4). If the user terminal number is not in the whitelist, it rejects the user terminal’s network access application. (3-4) After the user terminal successfully joins the network, the load monitoring unit analyzes the received beam resource application information and the currently available beam resource information, and feeds back the beam resource allocation results to the user terminal.

5. The multi-functional satellite store-and-forward communication method with on-demand access according to claim 1, characterized in that, The specific process of storing and forwarding files in step (5) is as follows: (5-1) After the ground control center receives the information from the payload monitoring unit that the transmitting user terminal has successfully joined the network and applied for beam resources through the gateway station, it then sends data storage and forwarding instructions and receives user terminal information to the store and forward system through the gateway station. (5-2) The store-and-forward system receives and parses the received data storage and forwarding instructions and the receiving user terminal information, and generates a file receiving instruction; (5-3) The transmitting user terminal uploads the data file to be forwarded to the satellite's store-and-forward system through the allocated user beam resources; (5-4) After receiving the data file uploaded by the sending user terminal, the store-and-forward system performs storage operations and continuously monitors the network access and beam resource application status of the receiving user terminal through the load monitoring unit. (5-5) After the payload monitoring unit monitors the status information of the receiving user terminal successfully joining the network and applying for beam resources, it forwards the monitored status information and the backhaul route of the receiving user terminal obtained from the on-board switching unit to the store-and-forward system. The store-and-forward system then sends the file receiving instruction generated in step (5-2) to the receiving user terminal through the satellite-to-ground signaling beam and the backhaul route of the receiving user terminal. (5-6) After receiving the file receiving instruction sent by the store-and-forward system, the receiving user terminal parses the instruction and then returns the file transfer request to the store-and-forward system through the signaling beam and the preset satellite route; (5-7) After receiving the file transfer request returned by the receiving user terminal, the store-and-forward system sends the stored data file to the receiving user terminal to complete the file transfer process.

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