支持突发粒度的多粒度光交换结构研究  

Research on architecture of burst-enabled multi-granularity optical switching

作　　者：黄胜[1,2] 隆克平[1,3] 阳小龙[1,3] 陈前斌[1] 李培江[1] 

机构地区：[1]重庆邮电大学光互联网及无线信息网络研究中心 [2]重庆大学通信工程学院,重庆400044 [3]电子科技大学光互联网及移动信息网络研究中心,成都610054

出　　处：《重庆邮电大学学报（自然科学版）》2007年第1期66-69,共4页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家"863"计划项目(2005AA122310);国家自然科学基金项目(90304004);国家教育部新世纪优秀人才支持计划(教技司[2005]2号);重庆市科委项目(2005BB2062;2005AC2089);重庆市教委项目(KJ060508;KJ060513);重庆邮电大学通信学院青年基金资助。

摘　　要：多粒度光交换能减小光交叉连接矩阵的规模,能降低光节点的成本。然而现有多粒度光交换结构的最小交换粒度常为波长,该交换粒度太大,会导致核心节点的链路利用率低。针对这种缺陷,提出了一种支持突发粒度的多粒度光交换节点结构。在传统级联式多粒度光交换结构的基础上,核心节点结构增加了光突发交换矩阵,利用光突发交换的交换粒度小和统计复用特性,提高了链路利用率;并且去掉了波长交换矩阵,以降低核心光节点的复杂度和成本。在这种新结构下,提出了一种波带分配算法,能根据业务流量的实际需求动态地新建和拆除波带信道,从而提高了波带信道的利用率。Multi-granularity optical switching can reduce the size of optical cross-connect and the cost of optical nodes. But its smallest switching granularity, which is often the wavelength, is too big for some traffic, and this will induce the low link utilization. A new multi-granularity switching architecture that supports optical burst switching is proposed to get high link utilization rate. Based on the concatenation architecture of multi-granularity optical switching, the core node architecture adds burst switching matrix and utilizes the small switching granularity and statistical multiplexing of optical burst switching to improve the performance of link utilization. And the architecture removes wavelength switched matrix to decrease the complexity and cost of the core node. Then based on the archi- tecture, a waveband allocation algorithm that can dynamically set up and release the waveband channel by the actual bandwidth demand of the traffic is proposed to improve the waveband utilization.

关 键 词：多粒度光交换 波带 光突发交换 

分 类 号：TN915[电子电信—通信与信息系统]