Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
449453 | Computer Communications | 2008 | 7 Pages |
In this paper, we investigate the problem of survivable routing in backbone optical transport networks with Shared-Risk Link Groups (SRLG) constraints. We present a new idea that considers the different risk-level protection for difference service level requirements of connection requests. Based on the presented idea, we propose an effective Risk-Level Disjoint Protection (RLDP) routing algorithm for provide different service level for connection requests. In RLDP, the backup path can be partial SRLG-disjoint with the primary path, and the backup wavelengths also can be shared by different backup paths if their corresponding primary paths are risk-level disjoint. Compared with the conventional SRLG-Disjoint Protection (SDP) routing algorithm that provide full SRLG-disjoint survivable routing for each connection request, RLDP can perform better resource utilization ratio and blocking probability. Simulation results are shown to be promising.