光突发交换网络中支持业务区分的多路由机制研究  

Research on the multi-path routing mechanism with service differentiation in OBS networks

作　　者：黄胜[1] 胡莲花 孙丽琴[1] 刘焕淋[1] 

机构地区：[1]重庆邮电大学光纤通信技术重点实验室,重庆400065

出　　处：《光电子．激光》2014年第2期270-275,共6页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(61071117;61171158;61275077);重庆市自然科学基金(cstc2013jcyjA40052;cstc2012jjA40060);重庆市教委项目(KJ110519;KJ110527)资助项目

摘　　要：针对光突发交换(OBS)网络的多路由机制多是考虑一种业务而对多业务区分的多路由机制研究偏少这种现状,提出了一种支持业务区分的多路由(MRSD)机制。在发送各个服务等级的业务之前,首先在没有共享风险链路的多条路由上发送请求包获得各条路由上的多种优先级业务的负载情况,然后根据爱尔兰固定点近似分析法计算各种优先级业务在不同路由上的丢包率,并为每种优先级业务选择一条使本业务丢包率最小的路由;在一个核心节点内,则采用基于额外偏置时间的业务区分方法实现不同优先级业务的区分,将各种业务根据链路状态信息分配到没有共享风险链路的多条路由上去传输,从而在减少突发丢失率(BLP)的同时实现了多种优先级业务在路由上的区分。仿真结果表明,这种多路由机制能够有效降低网络的BLP,实现区分服务。In optical burst switching（OBS） networks,many proposed multi-path routing mechanisms only consider a service and the researches about multi-path with multi-services are few. However,many proposed multi-path routing mechanisms only consider a service an d the researches about multi-path with multi-service are few.To solve this problem,a new mul ti-path mechanism with service differentiation is proposed in this paper.The mechanism sends probe packets to o btain the load information of multi-service on the multi-path routing without sharing risk link before sending the services with different service levels.According to the load information,the burst loss rate of each service on each route is calculated by Erlang fixed point approximate analysis method.And a rou te with minimal burst loss rate is chosen for the service.In a core node,different services are di fferentiated by the extra offset-based service differentiation method.In this way,by the link state inf ormation,different services are distributed to multi-path routes without sharing risk link,and this helps to reduce the burst loss rate and realize the service differentiation by the multi-path routing.The simulati on results show that the proposed routing mechanism can effectively reduce the burst loss rate and suppor t service differentiation.

关 键 词：光突发交换(OBS)网络 多路径路由机制 业务区分 

分 类 号：TN929.11[电子电信—通信与信息系统]