29. Research on Multi-Path QoS Routing Strategy for the Satellite Network

The satellite network, together with the traditional ground network, constitutes the Space–Ground Interconnection Network (SGIN), which can provide global coverage for communications and become an important developing trend of the next generation network. Currently, there exist lots of routing algorithms that are based on the characteristics of satellite networks. However, most of them focus on a single transmission performance index while ignoring others. A multi-path parallel routing strategy for the satellite network based on Quality of Service (QoS) requirements and information of inter satellite links (ISLs) is proposed. Firstly, the strategy utilizes the historical and near-real-time information of the ISLs to conduct off-line routing computing on the ground. After that, real-time information of the ISLs and QoS requirements for data communications will be reconsidered on board to adjust the pre-computed routing scheme. Finally, data transmission will be allowed to take place on several routes between the source and the destination in parallel. This strategy not only ensures high arrival rate and low latency of data transmissions, but also fully utilizes link resources of the satellite network and balances the workloads among ISLs efficiently.