Research On Qos Routing Technique Of Laser And Microwave Hybrid Satellite Communication Networks

Satellite networks have the advantages of global coverage, high link bandwidth and multiplexing in frequency. It can provide global mobile access services and effectively alleviate transmission congestion in terrestrial networks. A hybrid satellite communication network with laser and microwave links makes comprehensive use of satellites in different orbits, and then establishes a multi-layer satellite network, and finally achieves an interconnection between optical and microwave communication. Routing protocol is one of the key techniques in satellite communication networks with hybrid laser and microwave links, which is the basis of the efficient and reliable information transmission for satellite networks.Based on the study of the satellite-ground and inter-satellite links, and orbit parameters and topology, this dissertation proposes a double-layered satellite network constellation scheme suitable for China space networking, and then evaluates the coverage performance of the proposed scheme. Additionally, this dissertation also defines the protocol functions of each layer in the proposed scheme, and briefly introduces an interconnection method for the hybrid laser and microwave communications.This dissertation emphasizes on the multi-constrained QoS routing problem. On the analysis basis of the background and feasibility of the multi-constrained QoS routing on satellites, this dissertation finds out an objective function with two parameters of delay and link utilization, and gives the method calculating the multi-constrained QoS routing table. Therefore, the multi-constrained QoS routing scheme is constructed. Finally, the performance of the proposed scheme is evaluated by programming with the OPNET network simulation tool. Simulation results show the effectiveness of the proposed algorithm.