[논문]Decision of Maximum Congestion Window Size for TCP Performance Improvement by Bandwidth and RTT Measurement in Wireless Multi-Hop Networks

Huh, In; Lee, Jae-Yong; Kim, Byung-Chul

doi:10.3745/jips.2006.2.1.034

Decision of Maximum Congestion Window Size for TCP Performance Improvement by Bandwidth and RTT Measurement in Wireless Multi-Hop Networks 원문보기

International journal of information processing systems, v.2 no.1 = no.2, 2006년, pp.34 - 38

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)

Abstract ▼ AI-Helper

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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제안 방법

In this paper, we suggest a TCP performance improve ment scheme by limiting the maximum congestion window size based on the measured bandwidth and Round-Trip- Time (RTT). Previous research into the contention window limit suggested that it is the function of the number of hops from the source to the destination, but that method raise many problems as we will see later.
In this paper, we suggest a new maximum congestion window size-setting algorithm that considers current channel bandwidth and RTT instead of the number of hops. This algorithm works well with any kinds of routing algorithm and shows good TCP performance in any kinds of system topology.
The wireless multi-hop wireless network model used in this study consists of a set of 17 nodes in a chain topology confined to a 5000mX 1500m rectangular area and a DRS protocol is used as a routing protocol. We simulated the suggested scheme by increasing the chain length between TCP source and destination.

이론/모형

PacketSizek is the total bytes of the previously transmitted packets, which were acknowledged between (k-l)-th ACK and (k)-th ACK. Equation (2) shows the smoothing method of BW£j by applying the Exponentially Weighted Moving Average (EWMA) method using a. Using (2), we can control the ratio of the newly measured bandwidth and smoothed measured bandwidth so far.

참고문헌 (11)

K. Xu, M. Gerla, S. Bae, 'How effective is the IEEE 802.11 RTS/CTS handshake in ad hoc networks?', GLOBECOM '02, vol.1, pp. 72-76, Nov. 2002
K. Xu, T. Saadawi, 'Performance evaluation of TCP algorithms in multi-hop wireless packet networks', Wireless Communications and Mobile Computing '02, vol. 2, pp. 85-100 Nov. 2002
K. Xu, T. Saadawi, 'Reavealing the problems with 802.11 medium access control protocol in multi-hop ad hoc network', Computer Networks '02, vol. 2, pp. 531-548 Nov. 2002
TK. Kanth, S. Ansari, MH. Mehkri, 'Performance enhancement of TCP on multi-hop ad hoc wireless networks', Proceedings of IEEE International Conference on Personal Wireless Communications, vol. 5, pp. 90-94, Oct. 2003
S. Papanastasiou, M. Ould-Khaoua., 'TCP congestion window evolution and spatial reuse in MANETs', Wireless Communications and Mobile Computing. April 2004
K. Chen, Y. Xue, K .Nahrstedt 'On setting TCP's congestion window limit in mobile ad hoc networks', In 38th Annual IEEE International Conference on Communications ICC, 2003
Z. Fu, P. Zerfos, H. Luo, S. Li, L. Zhang, M. Geral, 'The impact of multihop wireless networks channel on TCP throughput and loss', Proceedings of 22nd Annual Joint Conference of the IEEE Computer and Communications societies '03, vol 4, pp. 1744-1753, March 2003
C. Casetti, M. Gerla, M. Mascolo, M. Y. Sanadidi, and R. Wang, 'TCP Westwood: Bandwidth estimation for enhanced transport over wireless links', ACM Mobicom, pp. 287-297, July 2001
I. F. Akyildiz, G. Morabito, and S. Palazzo, 'TCPPeach: A new congestion control scheme for satellite IP networks', IEEE/ACM Trans. Networking, vol. 9, pp. 307-321, June 2001

상세보기
X. Kai, T. Yu, and A. Nirwan, 'TCP-Jersey for wireless IP communication', IEEE Trans. on Selected Areas in Communications, vol 22, no.4, pp. 747-756, May 2004

상세보기
Networksimulator, ns2, http://www.isi.edu/nsnam/ns/

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DOI : 10.3745/JIPS.2006.2.1.034
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동의어: Packet Collision Rate

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