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提出了一种在光突发交换(OBS)网络核心节点中,基于突发包分片并考虑路径关联的可控重传方案。与以往研究相比改进之处在于,所提方法研究了在设定不同重传概率情况下,相同重传概率重传多次以及不同重传概率重传多次的情况,并对重传次数进行了限制,从而实现了对重传概率和重传次数的可控性;同时,还考虑到了路径关联因素对基于分片的可控重传方法的影响,从而克服了以往研究只涉及单路径而不能获取网络拓扑对分片技术影响的局限。利用路径阻塞率和字节丢失率对所提方法进行性能分析,并进行了仿真验证。从仿真结果可以看出,相比于传统方案,重传概率从1开始每减小0.2,突发包的阻塞率就将分别减小13%,24%,16%,6%。
A controllable retransmission scheme based on burst packet fragmentation and path correlation is proposed in the core node of Optical Burst Switching (OBS) network. Compared with the previous research, the improvement is that the proposed method studies the retransmission of the same retransmission probability multiple times and different retransmission probability retransmission multiple times under the condition of setting different retransmission probability, and analyzes the retransmission times The controllability of retransmission probability and number of retransmissions is also achieved. At the same time, the influence of path-related factors on shard-based controllable retransmission method is also considered, thus overcoming the limitations of previous studies on single path But can not get the limitation that the network topology affects the shard technology. The performance of the proposed method is analyzed by path blocking rate and byte loss rate, and the simulation is validated. As can be seen from the simulation results, the burst blocking rate will be reduced by 13%, 24%, 16% and 6% respectively, compared with the traditional scheme, with each retransmission probability decreasing from 0.2 to 1.