OBS网络中一种基于优先级和门限的偏射路由算法

为了解决偏射算法在偏射控制上的问题,提出了一种基于优先级和门限的偏射路由算法.该算法采用丢弃少量偏射的高优先级分割突发数据包来保证偏射路由上低优先级非偏射突发数据包的QoS.当冲突发生时,分割偏射优先级低的突发数据包,从而保护高优先级突发数据包|在偏射路由上,通过启用偏射检测函数来判断是允许偏射的分割突发数据包抢占资源或是丢弃偏射的分割突发数据包.仿真结果表明,虽然该算法增加了少量的端到端的传输时延,但这种算法可以很好地控制偏射突发对网络偏射路由上正常流量的影响,并且能够有效地降低整个网络的丢包率,很好地保护高优先级突发数据包的完整性.故这种方法能够有效地提高OBS网络的性能.

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

In order to solve the problem in deflection control of deflection algorithm,a deflection routing algorithm based on priority and burst loss threshold in OBS networks is proposed.It drops some high priority deflected bursts to provide QoS for low priority non-deflected bursts.When competition occurs,in order to protect high priority burst,low priority bursts are segmented and deflected.Then,the 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 although the proposed algorithm increase a little delay,it can efficiently prevent deflected burst from contending with non-deflected burst on deflected route,and reduce packet loss probability of entire networks and protect the integrity of some high priority bursts.As a result,the scheme can efficiently improve the performance of OBS networks.