一种重路由策略在低轨QoS卫星网络中的应用

A Rerouting Strategy in Low Earth Orbit QoS Satellite Networks

提出在低轨(LEO)服务质量(QoS)卫星网络中使用重路由策略容纳尽可能多的QoS业务.重路由是为接受新的传输请求,选择一个已经被网络接受的数据流并用其他的路径替代该数据流的路径,且不这样做,就无法接受这个新请求.计算机仿真验证了重路由策略应用在LEOQoS卫星网络中的可行性.结果表明,重路由策略能够有效地提高网络资源利用率,但同时也增大了数据流的连接切换频率.为了解决这个问题,结合LEO星座的网络拓扑特点提出了一种新方法选择数据流进行重路由,仿真结果表明,该选取方法改善了数据流的连接切换频率性能.

The rerouting strategy in the low earth orbit (LEO) quality of service (QoS) satellite networks was proposed to accommodate as much QoS traffic as possible. The rerouting means to select an already accepted flow and replace its established path with some other path in order to accept a newly arriving transmission request which can not be accepted without doing so. The feasibility of the rerouting strategy in the LEO QoS satellite networks was verified by the computer simulation. The results illustrate that the rerouting strategy can raise the utilization of network resources effectively, on the other hand, it would cause a higher connection handover frequency. For solving this problem, a new approach to select the accepted flow for rerouting according to the characteristics of LEO constellation network topology was proposed. The simulation results show that the proposed approach improves the performance of the connection handover frequency.