A Hybrid Routing Algorithm in Terrestrial-Satellite Integrated Network

Due to the wide coverage of satellite networks and high bandwidth of terrestrial networks, the terrestrial-satellite integrated networks have been proposed and received much attention in both industry and academia. To this end, we propose a hybrid routing algorithm to provide seamless integration of satellite network with terrestrial networks, in which transmission path can be selected adaptively according to the traffic demands of user terminals (UTs). To minimize the end-to-end delay, we first formulate the routing problem as terrestrial-satellite routing equipments (TSEs) selection problem. Then, according to the periodical movement characteristic, a satellite routing algorithm based on two-hop Inter-Satellite Link (ISL) is proposed, in which the transmission delay of satellite network can be predicted. Finally, to derive an optimal TSE pair, all possible delay combinations of the total link are enumerated. Simulation results show that the proposed hybrid routing scheme offers good performance in terms of end-to-end delay and throughput.