A well-aware resource reservation strategy TAW+ in the Optical Burst Switched System

Abstract

For the Optical Burst Switched (OBS) System, a new resource reservation strategy TAW+ is presented in the Intra-Domain Network Statue Model (INSM). By promptly using the control signal channel to update the INSM, better decisions are made in selecting optical path and assigning wavelength at each OBS network edge node, which can make the node to avoid reserving those being used link resources. Besides, a time slot is introduced to detect the latent collision, which not only can achieve the goal in preventing the forthcoming collision effectively, but also can better support multi-priority QoS. Furthermore, Virtual Configuration Table (VCT) at the network core node is further proposed to resolve collisions without bandwidth wastage. The analysis and simulation results verify the feasibility of the proposed strategy in the OBS network, show the enhancing of the network state awareness capability at edge node in lack of the optical conversion capability and optical buffer, and improve the effect on the data burst drop probability and QoS supports.