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The Congestion Estimation based TCP Congestion Control Scheme using the Weighted Average Value of the RTT

RTT의 가중평균값을 이용한 혼잡 예측 기반 TCP 혼잡 제어 기법

  • Lim, Min-Ki (Dept. of Electrical and Electronic Engineering, College of Information Technology, Kangwon National University) ;
  • Kim, Dong-Hoi (Dept. of Electrical and Electronic Engineering, College of Information Technology, Kangwon National University)
  • Received : 2015.04.01
  • Accepted : 2015.05.30
  • Published : 2015.06.30

Abstract

TCP, which performs congestion control in congestion condition, is able to help a reliable transmission. However, packet loss can be increased because congestion window is increased by the time the packet is dropped in the process of congestion avoidance. In this paper, to solve the above problem, we propose a new congestion estimation based TCP congestion control scheme using the weighted average value of the RTT. After measuring a SRTT, which means the weighted average value of RTTs, at this point of time when a buffer overflow is occurred by an overloaded packet, the proposed scheme estimates the time, when the same SRTT is made in packet transmission, as a congestion time and then decreases the congestion window. The simulation results show that the proposed schem has a good performance in terms of packet loss rate and throughput when the packet loss due to buffer overflow is larger than that due to wireless channel.

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