NGI中一种QoS重路由机制  

QoS Rerouting Mechanism in NGI

作　　者：王兴伟[1] 陈默[1] 高楠[1] 黄敏[1] 

机构地区：[1]东北大学信息科学与工程学院,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2007年第3期320-324,共5页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(60673159);国家高技术研究发展计划项目(2006AA01Z214);新世纪优秀人才支持计划项目;高等学校博士学科点专项科研基金资助项目(20060145012);辽宁省自然科学基金资助项目(20062022);国家发改委CNGI示范工程项目(CNGI-04-13-2T;CNGI-04-6-2T;CNGI-04-15-7A)

摘　　要：根据NGI和移动用户切换特点,借助模糊理论,设计了一种QoS重路由机制.通过引入链路可用带宽隶属函数、路径延迟隶属函数、路径延迟抖动隶属函数、路径出错率隶属函数、路径跳数隶属函数和链路质量评价表,对参数进行模糊评价;通过定义路径重复因子和路径选择因子,对路径质量进行评价;在此基础上,设计了QoS重路由步骤.基于NS2,进行了仿真实现.仿真结果表明,该机制是可行和有效的,在满足用户QoS需求的同时,降低了重路由信令开销.Based on the features of NGI and users＇ handoff, a QoS rerouting mechanism is proposed according to fuzzy theory. Introducing the membership function of the bandwidth available to link and the same functions of the delay, delay jitter, error rate and hop count of path and the link＇ s quality evaluation table, a fuzzy evaluation is done for the specific parameters. Then, the path overlapping factor and path selection factor are defined to evaluate the quality of the path, and the concrete steps of QoS rerouting are designed. An NS2-based simulation is thus implemented and the results show that the proposed mechanism is feasible and effective, and it can satisfy users＇ QoS demands with rerouting signal overhead reduced.

关 键 词：下一代互联网 服务质量 重路由机制 模糊理论 路径重复因子 路径选择因子 

分 类 号：TP393.14[自动化与计算机技术—计算机应用技术]