A distributed routing algorithm based-on simplified topology in LEO satellite networks

In this paper, a distributed routing strategy based on simplified topology (DRBST) was proposed for LEO satellite networks. The topology of LEO satellite networks was simplified aiming at minimizing inter-satellite links handover number. To optimize the route based on the simplified topology, we considered not only the transmission delay but also the queuing delay and the processing delay, which were analyzed using Markov chain and determined using a novel methodology. The DRBST algorithm was simulated in a LEO satellite networks model built using OPNET. The simulation results demonstrate that the low complexity DRBST algorithm can guarantee end-to-end delay bound. Moreover, the routing protocol cost is much less than traditional algorithms.