Journal of Information Processing Systems

Korea Information Processing Society (한국정보처리학회)
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Decision of Maximum Congestion Window Size for TCP Performance Improvement by Bandwidth and RTT Measurement in Wireless Multi-Hop Networks

  • Huh, In (Dept. of InfoComm. Eng., Chungnam National University) ;
  • Lee, Jae-Yong (Dept. of InfoComm. Eng., Chungnam National University) ;
  • Kim, Byung-Chul (Dept. of InfoComm. Eng., Chungnam National University)
  • Published : 2006.03.01
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Abstract

In the wireless network, TCP performs poorly because it was originally designed for wired networks and does not take into consideration wireless characteristics such as mobility, high-loss probability, and hidden-terminal problems. In particular, in the wireless multi-hop networks, a large congestion window increases the probability of contention and packet losses, and TCP performance is degraded severely as a result. So, it is necessary to limit the TCP congestion window size in order keep the probability of contention loss in the system to a minimum. In this paper, we propose a new scheme for determining the maximum congestion window size based on the measured bandwidth and Round-Trip-Time (RTT). Using ns-2 simulation, we show that the proposed scheme reduces the probability of packet contention and improves TCP performance.

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References

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