智能光网络中基于冲突避免的通道恢复机制  

Collision avoidance mechanism for path restoration in automatic switched optical networks

作　　者：曹毅宁[1] 叶亚斌[2] 郑小平[1] 李艳和[1] 

机构地区：[1]清华大学电子工程系 [2]华为技术德国公司光网络研究中心

出　　处：《清华大学学报（自然科学版）》2009年第10期1632-1634,1638,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家"八六三"高技术项目(2006AA01Z249;2006AA01Z252);国家自然科学重点基金资助项目(60572006);国家自然科学重大国际合作基金项目(6052130298);意大利外交部资助项目iCHIP

摘　　要：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。The recovery ratio of distributed path restoration is mainly affected by the resource reservation contentions in automatic switched optical networks （ASON）. This paper presents a collision avoidance based path restoration mechanism to increase the recovery ratio. The mechanism uses a colorizing algorithm to assign adjacent nodes to different wavelength sub-sets. The adjacent nodes then can select different wavelengths with different starting search points and sequences in the wavelength sub-sets for the recovery routes. Simulations show ;that this mechanism significantly reduces reservation contentions and achieves a higher recovery ratio than existing first fit or random wavelength assignment policies in cases of double-fiber failure scenarios. Moreover, the restoration brings no additional signaling cost, so it is suitable for large optical networks.

关 键 词：光纤通信 智能光网络 波长分配 冲突避免 

分 类 号：TN929.11[电子电信—通信与信息系统]