Conflict resolution algorithm based on channel grading and back-off channel mechanism in OBS networks
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摘要: 解决突发包的冲突问题是光突发交换网络的关键技术之一。为了降低突发包冲突时丢包率，提出了一种新型的基于信道分级和回退机制的冲突解决算法，该算法考虑突发业务优先级，将信道分成两个级别，有区别地对待高低优先级两种业务类型，并且增加了一部分回退信道作为保护和重发冲突数据包，能够有效地保证高优先级业务的传输可靠性。结果表明，当冲突发生时，网络能根据此时高低优先级业务量的比重配比，自适应地调节两个级别信道的数量，兼顾到低优先级业务的低丢包率，保证了较低的延时率。此算法相比以往的冲突解决算法具有较低的丢包率和相对小的延时率。Abstract: One of the most challenges in optical burst switching (OBS) networks is the resolution of burst conflict. In order to decrease the packet loss probability when bust conflict, a novel conflict resolution algorithm was proposed based on channel grading and back-off channel mechanism. The algorithm takes the priority of the unexpected business into account. The channels were divided into two levels of high and low priority to be treated differently. And then, the back-off channels were increased for the protection and the retransmission of conflict packet to guarantee the transmission reliability of high priority. The results show that, when conflicts occur, the network could adjust the number of two levels adaptively according to the proportion of the priority traffic. Taking into account the low packet loss rate of the low priority, small time delay rate is guaranteed. The algorithm can reduce the packet loss rate and the time delay in OBS networks effectively compared with the other conflict resolution algorithms.
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