A virtual node handover method with asynchronous update

Abstract

The invention relates to a virtual node handover method on the basis of a Satellite-fixed type LEO (low earth orbit) satellite. The method includes refining nodes of the satellite into ports and carrying out handover for virtual nodes according states of the ports; and dividing the nodes and the ports into a new portion and an old portion in a handover procedure, connecting a new topology with an old topology by updated-state nodes in the handover procedure, and translating the updated-state nodes via addresses of new / old topological data according to fixed mathematical rules so as to form a topological barrier. Accordingly, virtual topological handover cannot be noticed by the new and old nodes at two ends of the satellite in a routing procedure. Calculation generated when the virtual nodes are updated includes translation for the addresses of the data in a virtual topological network and update for an access data table, namely a sending address list consisting of peripheral nodes of the access virtual topological network. The handover procedure is designed into a layer-wise handover mode and a fastest infection mode, and the virtual nodes of the integral network are finally updated.

Description

technical field [0001] The invention relates to the field of satellite communication, in particular to a virtual node handover method based on a Satellite-fixed (satellite fixed) type LEO satellite. Background technique [0002] The IP (Internet Protocol, Internet Protocol) routing scheme of the LEO (Low Earth Orbit, Low Earth Orbit) satellite network mainly adopts DTVTR (discrete-time virtual topology routing, discrete-time virtual topology routing) and a logical topology based on VN (virtual node, virtual node). This is to shield the mobility of satellites. Among them, DTVTR needs a large storage space to maintain the virtual topology routing table. The more diverse the movement rules of satellites, the larger the size of the required routing table. The VN method has more advantages in this regard. [0003] The virtual nodes based on the interstellar network rely on the regularity of the movement of the satellite constellation to design the corresponding logical topology s...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to overcome the problems that the existing on-satellite update scheme has high requirements for satellite antenna pointing and tracking capabilities, the design of satellite hardware is relatively difficult, and the handover process has a great impact on users. The present invention provides A virtual node handover algorithm based on Satellite-fixed (satellite fixed) LEO satellites is proposed, which can reduce the requirements for satellite antenna pointing and tracking capabilities, reduce the difficulty of satellite hardware design, and reduce the impact on users during the handover process. Improve handover quality