Research On Routing Technology For Satellite Network

With the maturity of space technology,the cost of satellite manufacturing and launching is getting lower and lower,and the development of satellite network scale has become one of the important trends.Routing technology is the basis for satellite network to realize network service.With the increasing size of satellite constellations,routing technologies for small-scale satellite networks,such as snapshot routing,have the problems of dramatic increase in routing costs and low forwarding efficiency.This paper presents a low-overhead vector segment routing technology.The main innovations and contributions include:First,the thesis proposes a vector segmentation efficient forwarding method based on ground location area.Using the geographic location-based addressing mode,a vector forwarding channel is established using the geographic location information of the source and destination.The data packets are forwarded along the vector channel,shielding the effect of satellite node movement on routing forwarding.Designed a combined routing management of low and medium orbits.Using the wide coverage advantage of medium orbiting satellite,the routing forwarding process of large-scale low orbits multi-layer constellation is managed in segments.Seamless connectivity of vector channels in multiple segments is achieved through the conversion of location area addressing and node number addressing.Using a dynamic-static routing method,the medium-orbiting satellite performs static routing calculation and distributes routing tables,maintains the connectivity of vector channels over multiple segmented regions,and dynamically adjusts the forwarding paths according to network congestion.The simulation results show that the end-to-end delay,packet loss rate and throughput of the forward method have significant performance advantages in a low-orbit multi-layer constellation network with a size of 300.Second,the thesis proposes a low-overhead network state maintenance method.This method optimizes the routing overhead from two dimensions,(1)reduces the scope of network state updates,and designs a partition-based network state maintenance mode,which only occurs within partitions;(2)Reduce the frequency of network status updates by using link connectivity maintenance mechanism based on activity and queue status update mechanism based on congestion level;Through these two dimensions,effective control of satellite network routing overhead is achieved.The simulation results show that compared with snapshot routing technology,this maintenance method reduces routing overhead significantly and has good scalability in a low-orbit 300-member multi-layer satellite network.With the growing size of satellites,the demand for efficient routing technology for satellite networks is increasingly urgent.The low-overhead vector segment routing technology proposed in this paper provides a feasible solution for the future construction of satellite network in China.