T-MPLS网络中承载电路业务的最佳包长问题研究  

Research on the Encapsulations Issues of Circuit Emulation Service for T-MPLS Network

作　　者：曹畅[1] 张永军[1] 石帅[1] 李彬[1] 黄善国[1] 张杰[1] 顾畹仪[1] 

机构地区：[1]北京邮电大学信息光子学与光通信教育部重点实验室,北京100876

出　　处：《电子与信息学报》2010年第3期666-670,共5页Journal of Electronics & Information Technology

基　　金：国家863计划项目(2007AA01Z2a4);国家自然科学基金(60877052;60702005);教育部新世纪优秀人才支持计划(NCET-05-0112);教育部长江学者和创新团队发展计划(IRT0609)资助课题

摘　　要：该文基于ITU-T所制定的传送多协议标记交换标准,对客户端承载基于电路交换类型的业务进行了深入研究,比较了不同长度的电路业务分组对该业务延时和抖动的影响,并提出了一种动态改变电路业务封装包长的方案。该方案根据业务接收端数据的时延和方差统计情况,来计算一定范围内合适的电路业务净荷长度并反馈给源端的业务适配模块进行调整。为分析该方案的有效性,利用OPNET仿真软件搭建平台进行仿真。结果表明,该方案与固定封装包长方案相比在业务抖动特性和传输效率上具有明显的优势,能很好地适应电路业务的承载要求。This paper studies encapsulated packet length of circuit traffic in the multi-service transport multiprotocol label switching network,which based on ITU-T standards.And the paper compared the performance of the network according to different TDM packet length.Then,an adjustment scheme is proposed to change the packet length dynamically.With the consideration of the real-time conditions of the traffic＇s latency and variance,this scheme calculates the suitable payload sizes in the destination node and feeds back to the source node,in order to adjust this size in the adaptation module.This scheme is implemented in a testbed based on OPNET modeler for performance evaluation.The simulation results show that,compared with traditional constant bit encapsulation scheme,this scheme works more effectively both on the transmission quality and efficiency,and meets the requirement of supporting circuit traffic.

关 键 词：通信网络 传送多协议标记交换 电路业务 封装 包长 

分 类 号：TN915[电子电信—通信与信息系统]