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Modeling and analysis of TCP in satellite and mobile data networks interworking with the Internet

University of British Columbia

The Transmission Control Protocol (TCP) is the most widely used transport protocol for the Internet because of its good performance over wireline networks. However, TCP performance is seriously degraded in many interconnected heterogeneous wireless and wired networks because their large delays and high packet loss rates violate many of the original TCP assumptions. This thesis presents an analysis and a comparison of the performance of different TCP implementations in networks with satellite links and mobile links interconnected with remote LANs over the Internet, studies the effects of the critical network elements and the chosen TCP parameters on the TCP throughput performance, and obtains the optimal values for the chosen TCP parameters for the different TCP implementations. Compared with TCP Reno and TCP RFC, TCP Vegas not only has a better congestion avoidance mechanism to prevent network congestion and significantly reduce the probability of creating its own losses, but it also has a faster error recovery mechanism to quickly retransmit lost packets. Simulation results show that the satellite network elements and the TCP parameters have greater effect on the throughput of TCP Vegas than on the other implementations under most conditions for networks with satellite links. However, for networks with mobile links, the throughput performance of both TCP Vegas and TCP Reno is strongly affected by the mobile network elements and the TCP parameters. After jointly optimizing the key TCP parameters, the simulation results show that TCP Vegas has more than 100% better throughput than the other TCP implementations for networks with satellite links under a condition of high packet loss rates and long end-to-end delays. However, it just has an approximately 5% better throughput than TCP Reno for networks with mobile links under a condition of high packet loss rates and high mobility rates.

Thesis/Dissertation

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2009-05-22

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http://hdl.handle.net/2429/8063

Electrical and Computer Engineering

University of British Columbia

UBCV

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