Simulation of Different Strategies for QoS Improvement in OBS Networks

Due to the bufferless nature, one of the key challenges in optical burst switching networks is the contention resolution issue, which has made it increasingly important to facilitate QoS provisioning and improve QoS in optical burst switching by adopting appropriate strategies. In the paper, we address the issue of QoS improvement for different contention resolution strategies in optical burst switched networks, and a compounding strategy is proposed based on analysis of various strategies for supporting QoS. To evaluate the performance of different strategies in QoS improvement, simulation models were built up, and the emphasis was focused on comparing the blocking probability and channel utilization probability respectively according to different strategies. By simulation comparison, the difference of strategies in QoS improvement is detailed clearly, and results show that by adopting the compounding strategy, OBS network performance can be improved in QoS supporting.