WDM格型光网络中的动态组播共享保护算法

Shared Protection Algorithm for Dynamic Multicast Sessions in WDM Mesh Networks

该文针对WDM格型网络中单链路失效的情况,提出了一种保护动态组播业务的基于路径的优化共享保护(PB-OSPM)算法。该算法在基于最优路径对的共享不相交路径(OPP-SDP)算法的基础上,通过引入保护波长使用情况矩阵和波长预留矩阵记录预留波长资源的使用情况,允许不发生冲突的不同组播的保护路径间共享预留波长资源。研究采用欧洲光网络(EON)的拓扑对PB-OSPM算法和OPP-SDP算法在增性网络负载情况下的网络冗余度和同波长资源配置和网络负载情况下动态网络负载的网络连接阻塞率做了仿真。结果表明,相同条件下,PB-OSPM算法比OPP-SDP算法有更低的连接阻塞率。组播业务间波长资源的共享是提高波长资源利用率的有效方法。

This paper proposes a Path Based-Optimized Shared-Protection algorithm for Multicast sessions （PB-OSPM） against single link failure in WDM mesh networks. Based on the Optimal Path-Pair-based Shared Disjoint Paths （OPP-SDP） algorithm, PB-OSPM introduces wavelength usage matrix and wavelength reservation matrix to record the detailed usage of wavelengths reserved in the past so that the sharing of reserved wavelengths between protection paths of different multicast sessions can be enabled if the paths are not going to act at the same time. Study uses the topology of European Optical Network （EON） to simulate the network redundancy with an increasing network load and the blocking probability under various conditions of wavelength resources and dynamic network loads. The simulation results demonstrate the superiority of PB-OSPM over OPP-SDP and prove sharing wavelengths between different multicast sessions to be an effective way to improve wavelength usage.