Load balancing routing for low Earth orbit satellite network with hops-based back-pressure strategy
With the expansion of users scale in low Earth orbit(LEO)satellite networks,the bursty characteristic of network traffic and imbalanced regional communication load lead to the problem of load disequilibrium.A distributed hops-based back-pressure routing(HBPR)is proposed.HBPR calculates the link weight according to the remaining hops of the link's intermediate node to the destination satellite,firstly.Then,in order to control the number of available forwarding paths,the permitted propagation area is limited to a rectangular topology region shaped by source nodes and destination nodes to reduce the propagation cost.Finally,the HBPR is designed in a distributed way to realize the dynamic selection of the shortest link with low congestion and balanced distribution of traffic without collecting topology information of the whole network.The throughput optimality of HBPR is proved by theoritical analysis.Web simulation results show that compared with the existing routing protocols,HBPR has higher network throughput and lower delay.
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