自动交换光网络中的路由和波长分配问题

Analysis and Discussion on RWA Problem of ASON

在自动交换光网络(ASON)光路径的建立过程中,通常将寻找路由与分配波长结合起来考虑,称为路由和波长分配(RWA)问题。RWA对ASON的性能和流量工程(TE)影响很大。文章首先介绍ASON的基本架构和光技术的进展,对RWA问题中的路由子问题和波长分配子问题进行解析和探讨,提出RWA问题的整体解决方案,着重分析不精确网络状态信息下的路由,最后展望光网络的发展前景。

Finding route and assigning wavelength often need to be considered together in the course of setting up light-paths for ASON(Automatic Switched Optical Network). This is called RWA(Routing and Wavelength Assignment). RWA greatly affects the performance and TE(Traffic Engineering )of ASON. After giving a brief overview of ASON technology and the advances in optical component technology, we deal with two sub-problem of RWA separately, that is routing sub-problem and wavelength assignment sub-problem. Then our perspective on RWA is given with emphasis on routing under inaccurate network state information. Finally, a quick view of future trends in Optical Network is given.