An Effective Method for Guaranteed Shared Protection in WDM Optical Networks

摘要

Previous dynamic resource allocation methods (Separate Path Select, SPS) for survivable networks are always separated into two steps, that is, to determine an optimal primary path first and then select a backup path for the primary path. But SPS cannot achieve a good network performance. In this paper we analyze the drawback of the traditional SPS technique and propose an efficient shared protection method called M_SPS. Instead of rejecting an arrival call immediately when a backup lightpath for the optimal primary lightpath cannot be found, M_SPS continue to try the sub-optimal one until a legal primary-backup pair can be selected. We apply M_SPS to CERNET_Like and NSFNET networks. The results show that M_SPS improves the network performance remarkably.