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Performance Evaluation of TCP over OBS Networks with Multiple TCP Input Flows

Author: YuYongZuo
Tutor: WuJian
School: Beijing University of Posts and Telecommunications
Course: Electromagnetic Field and Microwave Technology
Keywords: Optical Burst Switching Burst Assembly Burst packet loss Delay damage Group packet queue
CLC: TN929.1
Type: Master's thesis
Year: 2009
Downloads: 18
Quote: 1
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Abstract


This paper mainly studies the impact of TCP traffic in OBS networks on its and OBS network TCP performance improved multiple TCP stream input case . In this paper , the main research contents are as follows: First, This paper summarizes the the OBS network structure characteristics and key technologies . Then , in theory, analysis of three important indicators of the TCP stream input to affect the performance of TCP over OBS networks : the burst packet loss , delay damage and the segment associated gain ; burst packet loss will cause TCP performance dropped significantly , delay damage causes TCP performance degradation the associated gain always play a positive role in the network . And the theory is verified by simulation . In addition, research on the burst assembly algorithm for TCP stream case OBS network , in-depth study of the different manifestations of the burst assembly algorithm for TCP load in the network : two-door , take time and packet length limit group package the case , when the network TCP traffic , with the increase of packet length threshold , TCP throughput will be increased and then decreased : when the network TCP traffic is very small , with the packet length threshold increases , the TCP throughput is not decreased . Finally, in multiple TCP streams burst assembly algorithm based on the research group packet queue number of TCP performance in OBS network , the conclusion is a reasonable choice group the number of packets queue will effectively improve the TCP performance in OBS networks . When packet length threshold small number of group package is more , the higher the throughput of TCP ; packet length threshold big time , the fewer the number of group package , the higher the throughput of TCP . Package Nagato limit 50KByte example, two queues TCP throughput is 69% higher than a five queue , 340% higher than the ten queue . When link increased packet loss , TCP throughput will vary somewhat , more group packet queue , the faster the decline as the link packet loss rate increases , the throughput of TCP .

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