论文部分内容阅读
Conventional optical burst switching(OBS)technique adopts purely statistical multiplex mechanismso that the bursts collide with each other very easily.To address this problem,a novel proactive con-tention avoidance scheme is proposed,which assigns dedicated wavelengths to each ingress node,then st-numbering algorithm is used to construct the traffic load balanced spanning trees .In this way,contentioncan be eliminated at ingress nodes,and the amount of bursts that could be accommodated by ingressnodes will be maximized.Further,those unused wavelengths left by traffic load balanced spanning treeare also organized as partial trees to carry bursts,thus the link utilization can be improved effectively.Simulation result shows that our scheme can improve the burst loss performance significantly without thewavelength converters or optical buffers comparing to other popular routing and wavelength assignment(RWA)algorithms.
Conventional optical burst switching (OBS) technique adoptive purely statistical multiplex mechanismso that the bursts collide with each other very easily.To address this problem, a novel proactive con-tention avoidance scheme is proposed, which assigns the dedicated wavelengths to each ingress node, then st -numbering algorithm is used to construct the traffic load balanced spanning trees. In this way, contentioncan be eliminated at ingress nodes, and the amount of bursts that could be accommodated by ingressnodes will be maximized .Further, those unused wavelengths left by traffic load balanced spanning treeare also organized as partial trees to carry bursts, thus the link utilization can be improved effectively. Simulation result shows that our scheme can improve the burst loss performance significantly without the wave length converters or optical buffers comparing to other popular routing and wavelength assignment (RWA) algorithms.