Several Methods To Conflict Problems In Optical Burst Switching Networks

Being a novel swiching technique for data transmission, optical burst switching(OBS) can realizes terabit data switching. In OBS researching fields, burst contention in OBS core nodes,which owes to the contention for bandwidth between several bursts. Therefore, it is very important to propose effective contention resulotion sehemes for the theoretical research and practical constraction of OBS networks.Among existing burst contention resulotion schemes have already been proposed in OBS networks nowadays, burst segmentation has been got high focus for its high-efficiently and low cost.However, most existing work of burst segmentation only refer to single type traffic and single path network scenario. In fact, OBS networks can support multi-type traffic, and we must consider multi-priority traffic arriving from other paths to a given path when study burst transmission on the given path. Therefore, there is some limitations for single type traffic and single path based burst segmentation model. To overcome the limitations, a busrt segmentation which can support quality of service(QoS) and consider path correction, has been proposed in this paper. The proposed model not only consider the effect of multi-priority traffic arriving from other paths to the given path, but also realize prioritized burst segmentation for QoS support in OBS networks.In addition, to enhance the effect of burst contention resultion, burst retransmission can reduce data loss in contention. However, existing works of burst retransmission have limitations, include uncontrollable, cannot support QoS, et al. To overcome such limitations, this paper proposes several controlled retransmission schemes, in which retransmission probability and times can be controlled.The proposed burst retransmission schemes can support burst segmentation technique, support multi-priority traffic, and consider path correlation. Results indicate that, out proposed controlled burst retransmission technique can effectively improve the performance in burst contention existed OBS networks.