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为了避免资源冲突引起的恢复操作失败,提出一种适用于智能光网络中基于冲突避免算法的通道恢复机制。该机制采用染色算法将节点映射至不同波长区间,选择不同的起点进行波长搜索,使相邻节点对为共用同一条链路的业务尽可能选用不同的波长进行恢复。仿真结果表明:在双链路随机故障下,该算法能显著降低冲突概率,恢复成功率明显高于现有的基于首次命中和随机波长分配算法的分布式恢复机制。同时,该机制保持通道恢复的分布式特性,没有额外的信令开销,适合大规模网络应用。
In order to avoid the failure of restoration caused by resource conflict, this paper proposes a channel recovery mechanism based on collision avoidance algorithm in intelligent optical network. The mechanism uses the dying algorithm to map the nodes to different wavelength ranges and selects different starting points for wavelength searching so that the adjacent nodes may choose different wavelengths for service sharing the same link as possible. The simulation results show that the proposed algorithm can significantly reduce the collision probability under the double link random failure, and the recovery success rate is significantly higher than the existing distributed recovery mechanism based on the first hit and stochastic wavelength assignment algorithm. At the same time, the mechanism maintains the distributed nature of channel recovery without additional signaling overhead and is suitable for large-scale network applications.