Research On Reliabile Routing Protocol Of Satellite Network

Satellite network is an integrated space communication network whichincludes LEO, MEO and GEO satellites. Satellite network is suitable foremergency communications, global communications and many other scenes,owing to the advantages of wide communication range, rich spectrum resourcesand not restricted by terrain conditions. However, compared to traditionalterrestrial communications networks, satellite network has dynamic topology,poor inter-satellite link quality and limited on-board processing resources.Mature ground routing protocol is not suitable for satellite network. The exisitingprotocols for satellite network are mainly focus on the optimization ofend-to-end delay, and did not take into account the influence of networkenvironment and the quality of the link to the network transmission performance.This paper focuses the research on satellite network routing strategy ofscholars at home and abroad, and aiming at the deficiency of existing results, thispaper establishes satellite network topology, and a time slot division meth od isused to shield the dynamic nature of satellite network. Satellite group is dividedaccording to the satellite coverage area, which assigns the route computing tasksto multiple satellites and makes a rational use of the limited satellite processingresources. Based on the established satellite network topology, this paper designsa multi-parameter reliable routing protocol based on the network evironment ofthe satellite network. In respect of data transmission, the protocol choosesend-to-end delay, pacek loss rate and available bandwidth as routing parameters,and selects the best overall performance path for data forwarding. The protocolimproves the transmission reliability of satellite network.Taking into account the satellite network nodes exposed in the wirelessenvironment, vulnerable to attacks by malicious nodes and infringement, thispaper proposes a trust-based routing security mechanism. The satellite node’snetwork behavior is quantized into trust degree, and nodes with low trust degreeare determined to be malicious nodes and cancelled the qualification ofcommunication. The mechanism prevents malicious nodes from attackingsatellite network, and improves network reliability from the view of routingsecurity.Based on the NS2network simulation software, this paper builds satellitenetwork simulation platform. Compared to classical protocols and algorithms,this paper makes the simulation of multi-parameter routing protocol and routing security mechanism, analyzes its performance, and proves the superiority of theproposed method.