Design And Simulated Implementation Of Traffic Protection Algorithms In Wbs Mesh Networks

With the explosive increase of network traffic and the appearance of high-performance optical equipments, the technology of Wavelength Division Multiplexing (WDM) has become the core element in next generation backbone networks. Although the WDM technology improves the network capacity, it increases the size of switching equipments (port number) the complexities of control and management. The Waveband Switching (WBS) technology can merge several wavelengths into one waveband that can be switched by using one port, so that the size of switching equipments and the complexities of control and management can be reduced. Therefore, the WBS technology becomes to a development trend in WDM optical networks. In addtional, the optical network carries a lot of traffic and the concequence is that any breakdown (e.g., fiber link cut) may lead to huge traffic lost. Therefore, it is nessesory to design the effective survivability in WDM optical networks.This thesis considers the different performance requirements of routing algorithms in Wavelength-Routed (WR) networks and WBS networks respectively, since the optimization objective in WR networks is for less hop count, while the optimization objective in WBS networks is for less switching ports by waveband grouping. The algorithm which are suitable for WR networks may not be suitable for WBS networks. Therefore, it is nessasary to design the new survivable routing algorithms to meet the requirments of WBS networks.This thesis presents three kinds of auxiliatry graphs to acheinve traffic grooming in WBS networks:Waveband Layered Graph, Waveband Integrated Auxiliary Graph and Wavelength Layered Graph In Waveband. Based on the three auxiliatry graphs, this thesis designs three protection algorithms:Dedicated Path Protection, Traffic Balanced Shared Sub-Path Protection and Differentiated Duration Path Protection.For validating and evaluating the performance of the designed algorithms, Chapter four of this thesis develops the simulation software based on VC++. Simulation results show that the designed algorithms are effective and have better performances.