SDH环状数据网中的集成自愈策略  

Integrated self-healing algorithm for SDH data ring networks

作　　者：汪卫章[1] 伍翔[1] 葛宁[1] 冯重熙[1] 

机构地区：[1]清华大学电子工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2002年第7期993-996,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目 (698962 40 )

摘　　要：在多层次网络结构 (例如 IP over SDH)中 ,对业务的保护切换技术不仅仅在某一层中实现 ,而是在几层都提供了保护功能。目前同步数字体系 (SDH)层自愈算法都是为电路业务设计 ,具有保护切换速度快 (≤ 5 0 m s)的优点 ,但资源利用率低 (≤ 5 0 % )。IP层的保护策略是为数据业务设计 ,资源利用率高 (≈ 10 0 % ) ,但切换速度慢 (>5 0 m s)。文中提出一种新的集成自愈策略 ISH,结合 SDH层的自愈操作来传输保护信令 ,通过 IP层的网络算法来提高链路利用率 ,从而具有与 SDH自愈类似的保护切换速度 ,在业务均匀分布时显著提高了链路利用率。论文并对 ISH的网络容量与排队时延进行了分析和仿真。In a multi layer network architecture, such as an IP over an SDH, protection switching techniques may be implemented in more than one layer. The SDH layer's self healing algorithms are designed for circuit oriented service, and their protection switching speed is rapid (≤50 ms), but resource utilization is low (≤50%). The IP layer's restoration algorithms are designed for datagram oriented service, and their resource utilization is high (≈100%), but their switching speed is slow (>50 ms). A cost effective self healing data network needs to combine the protection mechanisms of different layers. In this paper, an efficient algorithm integrated self healing algorithm is proposed, which keeps the merits of the two algorithms by transport healing signal in SDH layer and computing routing in IP layer. The integrated self healing algorithm network capacity and performance are analyzed and simulated.

关 键 词：SDH环状数据网 集成自愈策略 同步数字体系 自愈环 切换速度 路由保护 保护机制 自动保护倒换 

分 类 号：TN915.11[电子电信—通信与信息系统]