一种用于光组播冲突解决的节点结构及其调度策略

发布时间：2018-08-16 19:51

【摘要】：光分组在核心节点处的冲突解决问题是实现全光组播分组交换的关键。本文提出了一种新型的解决光组播冲突的节点结构,用于冲突解决的部分包括输出共享的网络编码模块和光纤延迟线(FDL)环形反馈共享缓存(FDL-LSFB)模块。网络编码模块将异或网络编码作为冲突解决方式,利用全光异或门将冲突组播进行网络编码并且改变编码后分组波长,从而避免波长冲突。而FDL-LSFB模块由子交换矩阵和FDL缓存组连接成环状,且冲突组播可从任意子交换矩阵进出缓存模块,使用少数的FDL可以提供大容量的光缓存、提高FDL利用率。针对FDL-LSFB模块冲突组播调度问题,为减小缓存时延,设计了最小缓存长度级联控制算法(MLCBST),进而提出冲突光组播的总调度策略。仿真结果表明,本文提出的组播节点结构和调度策略在降低丢包率(PLP)和减小缓存时延方面具有明显的效果。
[Abstract]:The conflict resolution of optical packets at core nodes is the key to implement all optical multicast packet switching. In this paper, a new node structure for solving optical multicast conflicts is proposed. The conflict resolution includes the output shared network coding module and the fiber delay line (FDL) ring feedback shared buffer (FDL-LSFB) module. The network coding module takes the XOR network coding as the conflict resolution method, uses all-optical XOR collision multicast to encode the network and change the packet wavelength after coding, thus avoiding the wavelength conflict. The FDL-LSFB module is connected into a ring by the sub-switching matrix and the FDL buffer group, and the collision multicast can move in and out of the buffer module from any sub-switch matrix. The use of a few FDL can provide a large capacity optical cache and improve the FDL utilization. In order to reduce the buffer delay, the minimum buffer length cascade control algorithm (MLCBST),) is designed to solve the scheduling problem of collision multicast in FDL-LSFB module. A total scheduling strategy for collision optical multicast is proposed. Simulation results show that the proposed multicast node structure and scheduling strategy have obvious effects in reducing packet loss rate (PLP) and cache delay.
【作者单位】：重庆邮电大学通信与信息工程学院重庆市光纤通信技术重点实验室;
【基金】：国家自然科学基金(61275077,61371096) 重庆市教委自然科学基金(KJ14000421) 重庆市科委自然科学基金(CSTC,2013jcyjA40052,2011jcyjA1361)资助项目
【分类号】：TN929.1

【参考文献】