Abstract:

In order to withstand and recover from concurrent multi-link failures in optical networks, a k-regular and k-connected structure based protection mechanism was proposed. Analysis shows that the k-regular and k-connected structure is an optimal protection structure in link-restorable mesh networks under multi-link failures. The linear programming model (ILP) for k-regular and k-connected structure and a construction method for k-regular and k-connected structure design were proposed. Simulations indicate that the spare capacity efficiency of k-regular and k-connected structure can reach the lower bound in static networks, and it can largely improve spare capacity efficiency compared with p-cycles based protection structure without reducing recovery rate under dynamic traffic.

Key words: optical transport networks, survivability, protection and restoration, multi-link failures