光突发交换网络中TCP Reno的性能分析

Performance Analysis of TCP Reno in Optical Burst Switching

该文在分析光突发交换(OBS)网络对TCP性能影响的基础上,研究了单个突发所包含的属于同一TCP/IP连接的分组数对TCP Reno吞吐量性能的影响,得到了一个吞吐量与突发丢失率、单个突发所包含分组数以及往返时延(RTT)的闭合表达式;并通过仿真验证了分析的正确性;分析和仿真结果表明,在接入链路带宽较大时,突发所包含的分组数存在一个最佳值,使TCP吞吐量达到最大。

Optical Burst Switching （OBS） is a promising paradigm for the next-generation internet infrastructure. Based on analyzing the influence of the special transmission mode in Optical Burst Switching （OB＇S） networks upon the performance of TCP, this paper studies the impact of the number of TCP/IP packets of same connection assembled in one burst on the performance of TCP Reno throughput. A closed form equation is obtained which represents the relationship between the throughput and the burst loss rate, number of TCP/IP packets contained in one burst, and the Round Trip Time （RTT）. The correctness of the analysis is then tested by simulation. Both the results of analysis and simulation show that an optimum number of TCP/IP packets of same connection assembled in one burst exists to make the TCP throughput maximum when the access link bandwidth is relatively large.