多光纤WDM网中的QoS路由算法

QoS ROUTING ALGORITHM IN MULTI-FIBER WDM TRANSPORT NETWORKS

利用区分光业务(DOS)模型可以将WDM光传送网中客户层(如IP)具有不同QoS要求的业务汇聚力较粗粒度的流,直接映射到光信道上,从而使客户层业务的不同QoS要求可以体现在DOS域的边缘光节点处的光路建立请求的不同优先级上。该文首先探讨了如何将多光纤WDM网转化为波长图,从而一次性解决选路和分配波长(RWA)问题,在此基础上,提出两种用于多光纤WDM网的QoS路由算法,对二者进行了比较,并进行了计算机仿真。

Basing on the DOS model's aggregating ability, the client layer's services with different QoS requirements can be mapped directly into the optical channel. Then the different QoS requirements of the client layer's services can be reflected by the different priorities of the connection request at the border optical node in a DOS domain. A wavelength graph method is presented in the multi-fiber WDM optical transport network to reduce the blocking probability of the connection request. Two optical QoS routing strategies, concentrating method and equalizing method, are proposed. The two methods are compared by simulation results of the network performance in different dynamic traffic load situations.