Research On Key Technology In GMPLS Based Optical Burst Switch Networks

Optical Burst Switch (OBS) technology combines both the advantages of Optical CircuitSwitching (OCS) and Optical Packet Switching (OPS), which eliminates the bottleneck ofelectronic switch in traditional optical network, and satisfy the needs of IP service for nextgeneration networks. Introduction of GMPLS based control plane enhances the network resourceutilization and reduces congestion in the OBS network. This thesis presents research on GMPLSbased OBS network its key techniques with theoretical analysis, system modeling, and algorithmsimulation, etc.Firstly, a converged OBS/ GMPLS network model is introduced including the analysis of nodearchitecture and the primary protocol framework. Then, the control protocol of OBS and the unifiedcontrol plane of OBS/GMPLS are discussed in detail. Channel establishment mechanism andQuality of Service (QoS) issue in the converged network are researched.With the analysis on existing RSVP-TE signaling based optical channel set-up procedure, animproved RESV signalling pre-loopback mechanism is proposed. With the loopbacking RESVsignal before arriving the destination node, the source node can transmit the burst data packet inadvance so that the total siganlling time can be shorten. Simulation shows that the set-up delayperformance of the pre-loopback mechanism has been improved considerably. Existing QoSmechanism of the converged network including preemption and Wavelength Partition (WP) arestuied. An improved QoS based LSP sharing (QLS) mechanism is presented which introduces thehigh or low limit for wavelength reservation according to various service level to realizewavelength statistical multiplexing. Simulation shows that QLS mechanism can not only guaranteethe performance of the high-priority service, but also reduce the packet loss rate of BE service andimprove the performance of the average loss rate.