基于OPNET的低轨卫星网络路由仿真与优化

OPNET Based Simulation and Optimization of Routing Protocols in LEO Satellite Networks

针对业务高速化、多样化背景的LEO(低地球轨道)卫星通信网络传输问题,提出一种复合分组调度策略和基于拥塞控制的备份路由方法相结合的路由算法,既保证了不同业务的服务质量,也在网络部分卫星节点因负载较重发生拥塞时实现业务分流,避免低优先级业务因资源竞争力较弱而"饿死",保证各业务的吞吐率,提高网络的性能。最后,以OPNET(优化网络工程工具)软件搭建了LEO卫星网络仿真平台,对文中提出的路由协议进行仿真,验证了算法的有效性。

This paper proposes a routing algorithm combining composite packet scheduling strategy and alternate routing policy for congestion control for LEO （Low Earth Orbit） satellite networks in a high data rate and diversified traffic background. The approach not only ensures the QoS （Quality of Service） of high priority traffic, but also provides alternate routing and prevents ＂starving＂ of low priority traffic because of weak resource competitiveness during heavy loading and congestion at nodes in a satellite network. As a result, the throughput and performance of the network are assured. An LEO satellite network simulation platform is constructed with OPNET software tool and the proposed algorithm and routing protocol are validated.