An uplink parallel access method suitable for multi-satellite cooperative communication

Abstract

This invention discloses an uplink parallel access method suitable for multi-satellite collaborative communication, belonging to the field of uplink access technology in satellite communication. For areas with overlapping coverage by multiple communication satellites, user terminals often access the nearest satellite based on ephemeris data, with communication services provided by a single satellite. Multiple satellites collaboratively providing services to user terminals in overlapping areas can improve communication quality. To achieve multi-satellite collaborative communication, user terminals need to access every satellite in the overlapping area, typically by sending uplink network access request signaling to each satellite in different time slots. This invention proposes an uplink access method using a satellite-to-ground link + inter-satellite link. The user terminal sends a network access request to one of the satellites. Upon receiving the network access signaling, the satellite synchronously and in parallel transmits the network access information to other satellites in the overlapping coverage area via the inter-satellite link, saving uplink access time slots for the user terminal and achieving efficient network access.

Description

Technical Field

[0001] This invention belongs to the field of uplink access technology for satellite communication, and particularly relates to uplink access methods for multi-satellite collaborative communication, especially efficient access methods for multi-satellite collaborative communication scenarios. Background Technology

[0002] In areas where multiple communication satellites overlap, user terminals typically access the nearest satellite based on its ephemeris, with a single satellite providing communication services. While multiple satellites can collaboratively provide services to user terminals in overlapping areas, improving communication quality, this requires user terminals to access every satellite in the overlapping area. This is generally achieved by sending uplink network access request signaling to each satellite in different time slots. When the number of satellites in the overlapping area is large, this traditional serial access method incurs significant uplink access time slot overhead, hindering the transmission of service information after successful access. Summary of the Invention

[0003] In view of this, the present invention proposes an uplink parallel access method suitable for multi-satellite cooperative communication, which aims to reduce uplink access time slot overhead by utilizing multiple inter-satellite links between multiple satellites to transmit user access information in parallel.

[0004] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows:

[0005] An uplink parallel access method suitable for multi-satellite collaborative communication is provided, which allows a user terminal to simultaneously access multiple overlapping satellites via satellite-to-ground links and inter-satellite links, where the number of overlapping satellites is N; specifically, it includes the following steps:

[0006] (1) The user terminal determines the nearest satellite in the overlapping area as satellite 1 and the other satellites as satellite 2 to satellite N based on the ephemeris;

[0007] (2) The user terminal performs downlink and uplink synchronization of signals to satellite 1;

[0008] (3) After the uplink and downlink synchronization is completed, the user terminal sends its own ID information to satellite 1 through the satellite-to-ground link in time slot T1 and the satellite-onboard network control of satellite 1 verifies the user terminal ID information.

[0009] (4) The onboard network control of satellite 1 synchronizes user terminal ID information in parallel with the onboard network control of satellite 2 to satellite N via the inter-satellite link in time slot T2.

[0010] (5) After receiving the user terminal ID information, the onboard network control of satellite 2 to satellite N verifies the user's identity and sends a successful synchronization response to the onboard network control of satellite 1.

[0011] (6) The onboard network control of satellite 1 sends N satellite access success response messages to the user terminal in time slot T3;

[0012] This completes the uplink parallel access suitable for multi-satellite collaborative communication.

[0013] The beneficial effects of this invention are as follows:

[0014] This invention can make full use of the parallel processing of user terminal access information by satellite-to-ground links and inter-satellite links, shorten the uplink access time slot of user terminals, and is suitable for satellite scenarios with a large amount of collaborative communication in overlapping areas. Attached Figure Description

[0015] Figure 1 This is a flowchart of an uplink access method suitable for multi-satellite collaborative communication.

[0016] Figure 2 It is the information content transmitted in each time slot. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings.

[0018] An uplink parallel access method suitable for multi-satellite cooperative communication. Figure 1 The uplink access procedure for N satellites is given. Figure 2 The information content transmitted in each time slot is given.

[0019] The method of this invention fully utilizes satellite-to-ground links and inter-satellite links, enabling user terminals to simultaneously access N overlapping satellite regions; for example... Figure 1 The specific steps shown are as follows:

[0020] (1) The user terminal determines the nearest satellite in the overlapping area as satellite 1 and the other satellites as satellite 2 to satellite N based on the ephemeris.

[0021] (2) The user terminal performs downlink and uplink synchronization of signals to satellite 1.

[0022] (3) After uplink and downlink synchronization is completed, the user terminal sends its own ID information to satellite 1 in time slot T1 to request uplink access. The onboard network controller of satellite 1 verifies the user terminal's ID information. Figure 2 As shown, the information transmitted in time slot T1 includes the frame header, satellite 1 network control address, user terminal ID, and frame tail.

[0023] (4) In time slot T2, the onboard network control of satellite 1 synchronizes user terminal ID information in parallel with the onboard network control systems of satellites 2 to N via inter-satellite links; such as Figure 2 As shown, the information transmitted from time slot T2 to satellites 2 to N includes a frame header, satellite n network control address, user terminal ID, and frame tail; 2≤n≤N.

[0024] (5) After receiving the user terminal ID information, the onboard network control of satellite 2 to satellite N verifies the user's identity and sends a successful synchronization response to the onboard network control of satellite 1.

[0025] (6) The onboard network control of Satellite 1 sends N satellite access success response messages to the user terminal in time slot T3; such as Figure 2 As shown, the information transmitted in time slot T3 includes the frame header, user terminal address, access success acknowledgment, and frame trailer.

[0026] At this point, the user terminal has completed access to N satellites in the overlapping area, achieving uplink parallel access suitable for multi-satellite collaborative communication.

Claims

1. An uplink parallel access method suitable for multi-satellite cooperative communication, used for a user terminal to simultaneously access multiple overlapping satellite regions via satellite-to-ground links and inter-satellite links, wherein the number of overlapping satellite regions is N; characterized in that, Specifically, the following steps are included: (1) The user terminal determines the nearest satellite in the overlapping area as satellite 1 and the other satellites as satellite 2 to satellite N based on the ephemeris; (2) The user terminal performs downlink and uplink synchronization of signals to satellite 1; (3) After the uplink and downlink synchronization is completed, the user terminal sends its own ID information to satellite 1 through the satellite-to-ground link in time slot T1 and the satellite-onboard network control of satellite 1 verifies the user terminal ID information. (4) The onboard network control of satellite 1 synchronizes user terminal ID information in parallel with the onboard network control of satellite 2 to satellite N via the inter-satellite link in time slot T2. (5) After receiving the user terminal ID information, the onboard network control of satellite 2 to satellite N verifies the user's identity and sends a successful synchronization response to the onboard network control of satellite 1. (6) The onboard network control of satellite 1 sends N satellite access success response messages to the user terminal in time slot T3; This completes the uplink parallel access suitable for multi-satellite collaborative communication.

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