Design of an adaptive DCF algorithm for TCP performance enhancement in IEEE 802.11–based mobile ad hoc networks

Authors:
Gira Lee;Han Jib Kim;Jae Yong Lee;Byung Chul Kim
Affiliations:
Department of Information Communications Engineering, Chungnam National University, Daejeon, Korea;Department of Information Communications Engineering, Chungnam National University, Daejeon, Korea;Department of Information Communications Engineering, Chungnam National University, Daejeon, Korea;Department of Information Communications Engineering, Chungnam National University, Daejeon, Korea
Venue:
ISPA'06 Proceedings of the 2006 international conference on Frontiers of High Performance Computing and Networking
Year:
2006

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Performance modeling of asynchronous data transfer methods of IEEE 802.11 MAC protocol

Wireless Networks
Ad Hoc Networking

Ad Hoc Networking

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Abstract

The TCP, which guarantees reliable data transfer, is the most widely used transport protocol for Internet applications. However, because the TCP was designed for wired networks, it degrades the transmission performance in wireless networks. In particular, the difference between the transmission range and the interference range in mobile ad hoc networks produces a hidden terminal problem that seriously deteriorates the TCP performance by constraining the simultaneous transmissions of several stations at a time. We therefore propose a new MAC algorithm for mobile ad hoc networks that can mitigate the effect of the hidden terminal problem by adaptively adjusting the contention window process. While a node in the IEEE 802.11 DCF increases its contention window exponentially whenever the node fails to transmit, the proposed algorithm changes the contention window adaptively according to the probable cause of failure. This change enhances the TCP performance by roughly discriminating hidden terminals and real collisions. The simulation results show that the proposed algorithm enhances the TCP performance by evenly distributing the transmission opportunity to every node in mobile ad hoc networks.