A low-overhead flooding method and satellite nodes for a leo/meo two-tier satellite network

Abstract

The invention discloses an LEO / MEO double-layer satellite network low-overhead flooding method and a satellite node. A source node floods to a same layer and a different layer, and the satellite nodereceiving a link state information packet from an interlayer link is called a proxy satellite node; the source node and the satellite node are used as original points of the layer, the satellite nodejudges the position relation with the original point after receiving the link state information packet, the link state information packet is transmitted along the link between same-rail satellites inthe case of same layer and same rail and is also transmitted along the link between satellites on different rails; the link state information packet is only transmitted along the link between satellites on different rails in the case of same layer and different rails; and if the satellite node is the proxy satellite node, the link state information packet is transmitted along the link between same-rail satellites and is also transmitted along the link between satellites on different rails; and the repeatedly received link state information packet is discarded during the transmission. By adoption of the LEO / MEO double-layer satellite network low-overhead flooding method, the flooding overhead when the terrestrial Internet OSPF protocol is applied to an LEO / MEO double-layer satellite networkis reduced, and meanwhile the effect of the traditional flooding of link state information transmission in the whole network is achieved.

Description

technical field [0001] The invention relates to the technical field of space networks, in particular to a low-overhead flooding method and a satellite node of a LEO / MEO double-layer satellite network. Background technique [0002] Among non-geostationary orbit satellites, low-orbit satellites (LEO) have low satellite-to-ground transmission delay and link propagation loss due to their low orbit heights, and have low requirements for user terminals. However, the coverage of a single LEO satellite is limited, and a large-scale constellation is usually required to achieve global coverage, and the system investment is large. Medium-orbit satellites (MEO) have a high orbital altitude, large satellite-to-ground transmission delay, and large link propagation loss, which requires high requirements for user terminals. However, due to the high orbital height and wide coverage of MEO satellites, generally only a dozen satellites are needed to achieve global coverage, and the system inv...

AI Technical Summary

Problems solved by technology

When the traditional terrestrial Internet Open Shortest Path First (OSPF) routing protocol is applied to the LEO / MEO double-layer satellite network, due to the dynamic change of the network topology, the OSPF protocol needs to frequently flood the link state information packets into the network. Therefore, it has a protocol Disadvantages of high cost

[0004] At home and abroad, there are few studies on how to reduce the overhead of the OSPF protocol. Only the document "A Novel RoutingScheme for LEO Satellite Networks based on Link State Routing" (CSE2015) proposes an improved flooding method for LEO single-layer satellite networks, but this method can only be applied to a single-layer satellite network

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