【摘要】 针对卫星网络传输时延大、流量不均衡和链路误码率高的问题,提出了一种新的基于MPLS的双层卫星网络路由算法,采用GEO/LEO双层卫星网络拓扑,引入了多协议标记交换流量工程的概念,在路由选路过程中综合考虑传输时延、剩余带宽和出错率等问题,将它们的综合参数作为选路的初始权重,充分考虑卫星网络特点对路由的影响,同时考虑将来的可能建路请求对当前建路的影响,动态地改变各链路的权重使整个网络达到流量负载均衡,并提高卫星网络的整体性能。仿真结果表明,路由算法在请求带宽拒绝率、请求带宽拒绝数和网络吞吐量等方面性能明显优于CSPF和WSP算法,提高了卫星网络系统的整体性能。更多还原

【Abstract】 In this paper,aiming at the character of long delay,traffic unbalancing and high bit error rate in the satellite networks,a novel routing algorithm for double-layered satellite networks was presented based on MPLS.The GEO/LEO double satellite network topology and concept of multi-protocol label switching traffic engineering were adopted in this algorithm.The delay,traffic remaining bandwidth and bit error rate were considered in routing.The combination of link propagation delay,remaining bandwidth and error rate was initial value.At the same time,in order to make the network traffic load balancing and improve performance in the satellite networks,the influence between current request and future requests for the establishment of paths was considered.Simulation results demonstrate that the algorithm performs better than CSPF and WSP in terms of request bandwidth reject ratio,request bandwidth reject amount and throughput,and the systems performance of satellite networks can be improved.更多还原