Spare resources control function enhanced self-healing algorithm

Recently, many self-healing algorithms have been proposed to achieve survivability requirements when a failure occurs in the network. The so-called, pre-assigned backup VP (virtual path) restoration algorithm has been proved to have a fast restoration from failure, but its success greatly depends on how the traffic is distributed and how the spare capacity is dimensioned over the network. In this paper, we address the problem of spare capacity resource control, in order to guarantee complete restoration, improving the survivability performance of the self-healing algorithm. Centralized and distributed controls are used as methods for backup VP assignment. The performance of each method and the management of spare resources are investigated by simulation. The results show that the centralized method has higher efficiency, in resource utilization, than the distributed one. Furthermore, the spare resource control can achieve good fairness performance in resource utilization