CN-122027010-A - Multi-connection management method suitable for high-low orbit fusion satellite communication terminal

CN122027010ACN 122027010 ACN122027010 ACN 122027010ACN-122027010-A

Abstract

The invention discloses a multi-connection management method suitable for a high-low orbit fusion satellite communication terminal, which comprises the steps of establishing communication connection with a high orbit satellite, acquiring ephemeris information of the low orbit satellite, predicting a visible time window of a target low orbit satellite according to the ephemeris information, dynamically evaluating the quality of a composite link at a future moment, and executing forward-looking multi-connection state management based on the visible time window and the quality of the composite link, wherein the multi-connection state management comprises a preparation state of triggering antenna pre-pointing before the visible of the target low orbit satellite and a transition state of triggering high-low orbit double-link simultaneous transmission before the coverage of the low orbit satellite is finished. The invention overcomes the defect that the traditional passive response type switching has a communication blind area in the link handover period, realizes the pre-establishment and the post-breaking of the cross-track link, and effectively ensures the continuity and the high reliability of the service data transmission in the complex space network.

Inventors

LAI HAIGUANG
XU KAIMIN
WAN KUN
LIU SHUO

Assignees

南京控维通信科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260416

Claims (10)

1. The multi-connection management method suitable for the high-low orbit fusion satellite communication terminal is characterized by comprising the following steps: Establishing communication connection with a high-orbit satellite, and acquiring ephemeris information of a low-orbit satellite; Predicting a visible time window of a target low-orbit satellite based on the low-orbit satellite ephemeris information, and dynamically evaluating the quality of a composite link at a future moment; And performing prospective multi-connection state management based on the visible time window and the composite link quality, wherein the multi-connection state management comprises a preparation state of triggering antenna pre-pointing before the visible low-orbit satellite of the target and a transition state of triggering high-low orbit dual-link simultaneous transmission before the coverage of the low-orbit satellite is finished.
2. The method according to claim 1, wherein the multi-connection state management specifically comprises the following circulation states: The high orbit capturing state is that the terminal searches and locks the high orbit satellite signal after starting up; a high-orbit communication state, namely establishing a high-orbit communication link to bear service and receiving low-orbit satellite ephemeris information; A preparation state, namely when a system clock reaches a preparation trigger time determined based on the ephemeris information of the low-orbit satellite, maintaining the activation of a high-orbit communication link, and controlling the antenna beam to point to the predicted azimuth of the target low-orbit satellite in advance; a low-orbit capturing state, namely initiating low-orbit signal capturing after a target low-orbit satellite enters a visible range; After the low-rail signal is locked, the low-rail communication link is established to bear main service, and the high-rail communication link is degraded to a signaling holding mode; the transition state is triggered when the quality of the composite link meets the preset quality switching condition and the visible time window is smaller than the preset transition time length, the high-rail communication link is restored to a full-rate communication mode, and the high-rail and low-rail dual-link simultaneous transmission is executed; And in the abnormal recovery state, triggering when the low-rail communication link is suddenly abnormal, and starting the high-rail emergency recovery process.
3. The method of claim 2, wherein the multi-connection state management further comprises a secondary low-rail capture state; When in the low-orbit communication state, if the coverage window of the next target low-orbit satellite and the current low-orbit satellite is predicted to be overlapped according to the ephemeris information of the low-orbit satellite, entering a secondary low-orbit capturing state; In the secondary low orbit acquisition state, while maintaining the current low orbit communication link, an attempt is made to acquire the signal of the next target low orbit satellite, and after the acquisition is successful, the service is switched to the next target low orbit satellite.
4. The method according to claim 1, characterized in that the composite link quality at the future time is dynamically evaluated, in particular by weighted summation of the following normalized dimensions: A predicted carrier-to-noise ratio normalization dimension determined based on the extrapolated predicted elevation angle and the satellite-to-ground offset of the low-orbit satellite ephemeris information; determining an available bandwidth normalization dimension based on the available bandwidth of the target low-orbit satellite and a preset system maximum bandwidth; A predicted remaining coverage time normalization dimension determined based on the visible time window; the propagation delay normalized dimension is determined based on the round trip propagation delay of the target low orbit satellite.
5. The method according to claim 1, characterized in that in performing a look-ahead multi-connection state management, the terminal is allowed to switch from a high-orbit satellite to a target low-orbit satellite-carried service if and only if preset ping-pong prevention conditions are met; The ping-pong prevention protection condition comprises that a visible time window is larger than the sum of the duration of the preset low-rail signal capturing link establishment duration, the preset minimum effective service duration and the preset high-rail link recovery preparation duration.
6. The method of claim 5, wherein the ping-pong prevention conditions further include an overlap window protection condition for inter-satellite handoff in a scenario where the target low-orbit satellite is the next co-orbit satellite that takes over the current low-orbit satellite; the overlapping window protection condition is that a predicted overlapping coverage window of a current low-orbit satellite and a target low-orbit satellite, which are predicted based on the ephemeris information of the low-orbit satellite, is larger than or equal to the low-orbit signal capturing and chain building time length.
7. The method of claim 5, wherein the minimum effective service duration is adaptively configured according to a service type currently carried by the terminal; The method comprises the steps of configuring the minimum effective service duration of a first time length for delay-sensitive services, and configuring the minimum effective service duration of a second time length for high-throughput non-real-time services, wherein the first time length is smaller than the second time length.
8. The method of claim 1, wherein during the transitional state, the terminal simultaneously maintains communication link activation with the high-orbit satellite and the target low-orbit satellite and performs multipath traffic data co-transmission; The multi-path service data simultaneous transmission is characterized in that a transmitting end distributes a uniform sequence number for a service data packet to be transmitted, and the same service data packet carrying the uniform sequence number is simultaneously transmitted to a receiving end through a high-rail communication link and a low-rail communication link, and the receiving end performs combination processing based on the uniform sequence number.
9. The method of claim 8, wherein the multi-path traffic data concurrent transmission employs a full-volume dual-send mode: And performing the operation of allocating the unified sequence number to all the service data packets to be transmitted and simultaneously transmitting the service data packets through the high-rail communication link and the low-rail communication link to realize the redundant transmission of the total service data.
10. The method of claim 8, wherein the combining process performed by the receiving end based on the unified sequence number specifically comprises: the receiving end configures an annular duplicate removal buffer zone adapting to the transmission delay difference of the high rail and the low rail, and extracts a uniform serial number carried by the service data packet after receiving the service data packet; Searching a unified serial number in the annular de-duplication buffer, if the unified serial number is received for the first time, delivering the service data packet to an upper layer application, creating a record in the annular de-duplication buffer, and starting a de-duplication waiting timer; If the same unified sequence number exists in the annular duplicate removal buffer zone, the current service data packet is judged to be a duplicate data packet which arrives in a lagged mode, and discarding processing is carried out.

Description

Multi-connection management method suitable for high-low orbit fusion satellite communication terminal Technical Field The invention belongs to the field of satellite communication, and particularly relates to a multi-connection management method suitable for a high-low orbit fusion satellite communication terminal. Background With the development of an air-ground integrated network, the satellite internet has become a core support for building a global wide area information infrastructure. In modern communication networks satellite systems of different orbital heights carry differentiated transmission tasks. High orbit stationary satellites offer wide area coverage advantages, while low orbit constellation systems provide low latency and high throughput data interactions. How to guarantee the data flow and access stability of terminal equipment between different track links in a space network topology with high-speed dynamic change is a key technical proposition in the architecture design of the current next generation mobile communication system. Current satellite network terminals typically employ passive hard handoff mechanisms based on physical layer signal strength when accessing a multi-track system. Under the mechanism, the terminal triggers the signal searching and chain building process of the new orbit satellite after the actual measured signal quality of the current working link is attenuated to the disconnection threshold. For example, in a low-orbit satellite high-speed transit scenario, the terminal relies on the received signal strength indication to determine the validity of the current connection, once the signal drops by a threshold, disconnects the current connection and initiates reconnection operations to other available network nodes. This passive response mechanism allocates new resources only after the physical link is actually broken, resulting in an inherent communication dead zone during the network node alternation. The passive response type access and reconnection mechanism is difficult to consider the continuity of service transmission and the switching efficiency of network resources when facing the scene of high-speed movement of space nodes and limited coverage time, and frequent communication interruption or invalid signaling overhead is easy to generate in the link handover period. Therefore, it is necessary to research a method capable of improving data transmission robustness and service connection continuity in a complex heterogeneous space network scenario. Disclosure of Invention The invention aims to provide a multi-connection management method suitable for a high-low orbit fusion satellite communication terminal, so as to solve the problems in the prior art. The technical scheme is that the multi-connection management method suitable for the high-low orbit fusion satellite communication terminal comprises the following steps: Establishing communication connection with a high-orbit satellite, and acquiring ephemeris information of a low-orbit satellite; Predicting a visible time window of a target low-orbit satellite based on the low-orbit satellite ephemeris information, and dynamically evaluating the quality of a composite link at a future moment; And performing prospective multi-connection state management based on the visible time window and the composite link quality, wherein the multi-connection state management comprises a preparation state of triggering antenna pre-pointing before the visible low-orbit satellite of the target and a transition state of triggering high-low orbit dual-link simultaneous transmission before the coverage of the low-orbit satellite is finished. The invention overcomes the defect that the traditional passive response type switching has a communication blind area in the link handover period, realizes the pre-establishment and the post-disconnection of the cross-track link, and effectively ensures the continuity and the high reliability of service data transmission in a complex space network. Drawings Fig. 1 is a flowchart of steps of a multi-connection management method suitable for a high-low orbit fusion satellite communication terminal according to an embodiment of the present application. Fig. 2 is a flowchart illustrating steps for entering a secondary low track capturing state according to an embodiment of the present application. Fig. 3 is a flowchart of a step of merging processing by a receiving end based on a unified serial number according to an embodiment of the present application. Fig. 4 is a power-on flowchart of a fusion terminal according to an embodiment of the present application. Fig. 5 is a communication flow chart provided in an embodiment of the present application. Detailed Description In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompany