TCP在OBS网络环境中性能的建模分析  

Modeling TCP Performance in OBS Networks

作　　者：焦硕[1] 吴海珊[1] 徐坤[1] 林金桐[1] 

机构地区：[1]北京邮电大学光通信与光波技术教育部重点实验室,北京100876

出　　处：《北京邮电大学学报》2005年第6期39-43,共5页Journal of Beijing University of Posts and Telecommunications

基　　金：国家"863计划"项目课题(2002AA122022)

摘　　要：对传输控制协议(TCP)在光突发交换(OBS)网络中的性能分析结果表明,OBS组包机制导致TCP的拥塞控制性能恶化,并且Tahoe、Reno、New Reno和Sack 4种TCP模型恶化特性相同.建立了OBS网络中TCP吞吐量的数学模型,其中考虑了TCP确认(ACK)丢失的影响.网络仿真结果表明,该模型准确地反映了TCP吞吐量在OBS网络中的特点.最后基于模型计算结果,分析总结了TCP确认的丢失对TCP吞吐量影响,并建议在OBS网络中为TCP确认提供高优先级服务.TCP （transfer control protocol） performance in OBS （optical burst switching） network was studied, and the performance degradation of TCP tahoe, reno, new reno and sack in the OBS network was discussed. Considering the ACKs＇ （acknowledgement） losses, a simple analytic model was investigated to give the steady-state TCP throughput over the OBS network. The simulated result demonstrates that the model can accurately predict TCP throughput over a wide range of loss probabilities. The impact of ACKs＇ losses was analyzed based on the calculation results. Besides, ACKs were suggested to be treated as a kind of high QoS data in OBS network.

关 键 词：光突发交换 传输控制协议 性能退化 吞吐量模型 

分 类 号：TN929.11[电子电信—通信与信息系统]