WDM网络中基于p-path和p-cycle的混合保护方案

P-path and p-cycle-based hybrid protection scheme for WDM networks

为设计一种针对光网络中单链路失效的波长资源利用率高的快速保护算法,该文分析了完全预配置保护对预配置结构的约束,对比了预配置保护环(p-cycle)和预配置保护通道(p-path)保护性能,提出了p-cycle和p-path混合配置保护方案。该方案按比例选取p-cycle和p-path作为预配置结构,通过求解整数线性规划(ILP)方程得到优化配置方案。使用COST 239网络拓扑进行的仿真实验表明:相同网络负载和波长资源条件下,p-cycle和p-path混合保护方案比p-cycle独立保护方案的网络冗余度可以优化10%,同时保留了p-cycle快速保护的优点。

A fast protection scheme with low redundancy is needed for single link failures in wavelength-division multiplexing （WDM） optical networks. This paper analyzes the restriction of perfect pre-configured protection on pre-configured structures and then theoretically compares the protection offered by the pre-configured protection cycle （p-cycle） and that of the pre-configured protection path （p-path）. A hybrid fast protection scheme was then developed which mixes the p-path and p-cycle. This scheme selects p-cycles and p-paths in various proportions as pre-configured structures for near optimal configurations by solving an integer linear programming （ILP） problem. Simulation results with the COST 239 topology show that this hybrid protection scheme provides 10% better in network redundancy than a pure p-cycle scheme. Meanwhile, it retains the merits of the p-cycle for fast protection.