Multiple failures restoration by group protection in WDM networks

Single link/node failures are often occurred in daily network operation, which make them the most widely considered failure model in the literatures. Besides these conventional failures, in this paper we will focus on a new failure model, the group failure model, which occurs infrequently but is critical for seamless providing of network service. We examine the influence of this new model to general WDM network survivability mechanism, and present capacity optimization techniques for static protection and then propose the heuristics for solving the disjoint routing problems with group protection for dynamic traffic environment. The extensive simulations are conducted and the results are discussed to examine the relative influence of various network metrics for the proposed heuristics.