弹性光网络中资源节约型组播路由和频谱分配策略

Resource-saving multicast routing and spectrum allocation strategy in elastic optical networks

在弹性光网络中对组播路由和频谱分配问题进行研究,综合考虑了组播调制格式、网络中具有组播能力(MC)的节点个数和组播节点选取等因素,提出有效的预计算最短路径树的组播路由和频谱分配算法(PSPT-DMRSA)。在组播路由之前,在网络中预先放置适当的MC节点,然后建立源节点到目的节点的最小生成树,以减少整个组播请求所占用的链路条数和传输距离。此外,频谱资源分配时采用距离自适应的调制格式。仿真结果表明,该算法在频谱资源利用率方面获得了较优的性能。

This paper studies the multicast routing and spectrum assignment （MRSA） in elastic optical networks. Some restrictions including multicast modulation format, the number of MC nodes and select of MC nodes are considered. In addition it presents an effective algorithm for MRSA, namely PSPT-DMRSA. Before multicast routing, the appropriate pre-selected MC nodes are put in the network, and then the minimum spanning tree is established from source to destinations so as to reduce the number of links and transmission dis- tance occupied by the entire multicast request. Furthermore, the paper uses distance adaptive modulation level assignment in spectrum allocation. Simulation results show that the proposed algorithm achieves better performance in spectrum utilization.