基于光功率衰减值的ASON路径计算方法研究

Research on the ASON path calculation method based on optical power loss value

为解决ASON(Automatically Switched Optical Network)使用传统路径计算方法时恢复时间长以及阻塞率高的问题,提出了一种以光功率衰减值为权重的路径计算方法。该方法利用这一权重确定路径恢复时网络中每条链路被选中的概率以及每个站点的可达站点列表,进而根据每条链路被选择的概率之积最大的原则选择出一条链路业务量均衡以及跳数最短的恢复路径。经现场测试,使用该方法所得路径链路业务量更加均衡,有效降低了路径的阻塞率,同时保证了路径的恢复时间在100 ms以内。

In order to solve the problem which ASON（Automatically Switched Optical Network） has long recovery time and high blocking rate when using traditional path calculation method, a new algorithm based on the optical power attenuation value is introduced. The value is used to determine the probability of the path of each link which would be selected and the reachable lists of each station, then a recovery path which consists of balance link traffic and shortest hops based on principle of the product of the maximum probability is selected. On-site test shows that the path calculated by this method can get a more balanced selection of each link, and also can reduce the rate of path blocking and guarantee the delay recovery time within 100 ms.