一种基于门限的光突发交换受限偏射路由算法  

A Limited Deflection Routing Algorithm Based on Burst Loss Threshold in OBS Networks

作　　者：王汝言[1] 隆克平[2] 阳小龙[2] 吴畏[2] 朱维乐[1] 

机构地区：[1]电子科技大学电子工程学院,四川成都610054 [2]重庆邮电学院光互联网及无线信息网络研究中心,重庆400065

出　　处：《光电子．激光》2006年第1期86-89,共4页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(90304004);教育部科学技术研究资助项目(204125);重庆市科委应用基础资助项目(8061);重庆市教委科学技术资助项目(050309);重庆邮电学院青年基金资助项目(A2005-28)

摘　　要：提出了一种基于突发丢失门限的条件偏射路由算法(LDFD),该算法采用丢弃少量偏射的高优先级突发来保证偏射路由上较低优先级非偏射突发的服务质量(QoS)。当偏射的高优先级突发到达核心节点而该节点没有空闲数据信道时,就启用定义的偏射条件检测函数来判断是丢弃该突发还是允许其抢占非偏射的低优先级突发的资源,从而减少偏射突发与偏射路由上原有突发的竞争。仿真表明,该算法可以很好地控制偏射突发对偏射路由上正常流量的影响,并有效地提高整个网络的突发丢失性能。A limited deflection routing algorithm based on burst loss threshold for optical burst switching（OBS） network is proposed. It drops some high priority deflected bursts to provide QoS for low priority non-deflected bursts. When a deflected high priority burst arrives at a core node which has not any available channels,this node uses threshold check function to decide whether to drop or to preempt the resource of low priority non-deflected bursts on deflected route. Simulation results show that the proposed algorithm can efficiently prevent deflected burst from contending with non-deflected burst on deflection route, and effectively improve the burst loss performance of entire networks.

关 键 词：光突发交换(OBS) 偏射路由算法 突发丢失门限 门限检测函数 

分 类 号：TN929.11[电子电信—通信与信息系统]