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Design of Adaptive DCF algorithm for TCP Performance Enhancement in IEEE 802.11 based Mobile Ad-hoc Networks  

Kim, Han-Jib (Division of Electrical and Computer Engineering, Chungnam National University)
Lee, Gi-Ra (Division of Electrical and Computer Engineering, Chungnam National University)
Lee, Jae-Yong (Division of Electrical and Computer Engineering, Chungnam National University)
Kim, Byung-Chul (Division of Electrical and Computer Engineering, Chungnam National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.43, no.10, 2006 , pp. 79-89 More about this Journal
Abstract
TCP is the most widely used transport protocol in Internet applications that guarantees a reliable data transfer. But, in the wireless multi-hop networks, TCP performance is degraded because it is designed for wired networks. The main reasons of TCP performance degradation are contention for wireless medium at the MAC layer, hidden terminal problem, exposed terminal problem, packet losses in the link layer, unfairness problem, reordering problem caused by path disconnection, bandwidth waste caused by exponential backoff of retransmission timer due to node's mobility and so on. Specially, in the mobile ad-hoc networks, discrepancy between a station's transmission range and interference range produces hidden terminal problem that decreases TCP performance greatly by limiting simultaneous transmission at a time. In this paper, we propose a new MAC algorithm for mobile ad-hoc networks to solve the problem that a node can not transmit and just increase CW by hidden terminal. In the IEEE 802.11 MAC DCF, a node increases CW exponentially when it fails to transmit, but the proposed algorithm, changes CW adaptively according to the reason of failure so we get a TCP performance enhancement. We show by ns-2 simulation that the proposed algorithm enhances the TCP performance by fairly distributing the transmission opportunity to the failed nodes by hidden terminal problems.
Keywords
MAC; TCP;
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  • Reference
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