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Mobile Information Systems
Volume 5 (2009), Issue 1, Pages 21-32
http://dx.doi.org/10.3233/MIS-2009-0070

A new MAC Protocol for Reducing Effect of Needless Transmission Deferment Induced by Missed RTS/CTS Handshake

Tetsuya Shigeyasu,1 Daishi Inoue,2 Hiroshi Matsuno,2 and Norihiko Morinaga3

1Faculty of Engineering, Hiroshima International University, Japan
2Graduate School of Socio-Infrastructural Technologies, Hiroshima International University, Japan
3Graduate School of Science and Engineering, Yamaguchi University, Japan

Received 13 April 2009; Accepted 13 April 2009

Copyright © 2009 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

IEEE802.11DCF employs RTS/CTS (Request To Send/Clear To Send) mechanism for mitigating effect of hidden terminals. The RTS/CTS mechanism sets transmission deferral timer to neighbor terminals by exchanging RTS and CTS between transmitter and receiver. Then, in the case that RTS/CTS exchange succeeds, effect of hidden terminals could be suppressed, otherwise, any neighbor which received RTS and/or CTS defers its new transmission needlessly although DATA packet corresponding to the previous RTS/CTS exchange will not be transmitted. In this paper, we propose Cancel CTS, procedure in order to cope with the unnecessarily transmission deferment. Results of computer simulation confirms that our method well improves the throughput performance of IEEE802.11DCF.