OBS网络中基于优先级的先分割后缓存冲突解决方法

为了有效地降低突发包的丢失率和保证OBS网络中不同优先级业务的服务质量,提出了一种基于优先级的先分割后缓存冲突解决方法。该方法通过在多波长信道系统的输出数据信道上设置光纤延迟线组来缓存被分割的冲突突发包。当冲突发生时,首先基于突发包的优先级和处理完毕时间进行"竞争突发包头部分割或者原突发包尾部分割"处理;无冲突部分进行交换或者直接在事先预留的输出数据信道上处理,冲突部分的分割突发包进行光缓存。仿真结果表明,多波长信道系统中,高优先级突发包的丢失率低于低优先级突发包的丢失率。同时该方法在一定程度上可以有效地减少端到端的传输时延和整个网络的丢包率,从而提高整个OBS网络的性能。

A burst segmentation-optical buffer contention resolution mechanism based on priority in OBS networks

To effectively reduce the burst loss probability(BLP) and guarantee the quality of service(QoS) with different priority bursts,a burst segmentation-optical buffer contention resolution mechanism based on priority in optical burst switching(OBS) networks is proposed.The fiber delay units are intercalated to buffer the segmented part of bursts in the output data channels of a multi-wavelength channel system.When the competition occurs,the header of competition burst data packet or the tail of original burst data packet is segmented according to the priority and the processing time of bursts.The collision-free parts are exchanged or directly output in the reserved output data channel.Segmented bursts are buffered in the optical buffer.Simulations show that the burst loss probability of the high-priority is much less than that of the low-priority bursts in a multi-wavelength channel system.The mechanism also can efficiently reduce the end to end transmission delay and the burst loss probability of entire networks,so it can improve the performance of OBS networks.