A novel framework for dynamic survivable routing in mesh WDM networks

The paper proposes a novel framework of shared protection, namely group shared protection (GSP), in mesh wavelength division multiplexing (WDM) networks with dynamically arriving connection requests. Based on the (M:N)/sup n/ control architecture, GSP has n mutually independent protection groups, each of which contain N link-disjoint working paths protected by M protection paths. Based on this framework, an integer linear programming (ILP) formulation is proposed; it can optimally reconfigure the spare capacity for a specific protection group whenever a working-protection path-pair joins. Two heuristics, namely link-shared protection (LSP) and ring-shared protection (RSP), are introduced for further compromising the performance and the computational complexity. The proposed schemes are compared with a reported one, namely successive survivable routing (SSR). We conclude that GSP provides a scalable and efficient solution for dynamic spare capacity reconfiguration following the (M:N)/sup n/ control architecture.