An improved 802.11 DCF in a hybrid environment

Authors:
Zong-Jhe Wu;Jeng-Ji Huang
Affiliations:
Department of Applied Electronics Technology, National Taiwan Normal University, Taipei, Taiwan;Department of Applied Electronics Technology, National Taiwan Normal University, Taipei, Taiwan
Venue:
ICUFN'09 Proceedings of the first international conference on Ubiquitous and future networks
Year:
2009

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Abstract

Distributed coordination function (DCF) is the main technique of IEEE 802.11, which relies on carrier sense multiple access/collision avoidance (CSMA/CA) to reduce collision among stations. In this paper, a scheme is proposed to improve the throughput performance of the DCF in a hybrid environment, where a ready to send (RTS) frame is used when the length of a packet exceeds a threshold. Suppose, e.g., that a RTS frame and a packet are transmitted simultaneously, the result under the legacy DCF is that a collision occurs and both of them fail; the transmission bandwidth is thus wasted. To prevent this, an extra portion is added in front of the packet in the proposed scheme, and its length equals the size of a RTS frame. Clearly, it can prevent the packet from the collision process whenever it experiences a collision with one or multiple RTS frames.