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Title of Journal: Wireless Pers Commun

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Abbravation: Wireless Personal Communications

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Springer US

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DOI

10.1002/wsb.410

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1572-834X

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Enhancing IEEE 80211 MAC via a SenderInitiated R

Authors: Xiaoying Lei Seung Hyong Rhee
Publish Date: 2013/10/23
Volume: 75, Issue: 4, Pages: 2399-2409
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Abstract

The IEEE 80211 MAC adopted a collision avoidance mechanism in which contending stations should wait a random backoff time before sending a frame While the algorithm reduces the collision probability in general a large number of stations may still experience heavy collisions thus decrease the throughput In this paper we propose a simple reservation scheme for enhancing the performance of multiple access in 80211 MAC when a transmitter sends a frame if it has another frame to send in its output queue it may reserve an additional time that is needed to send the next frame and receive an ACK for the frame Thus a sender can occupy the medium for two data frames while reducing the collision probability and improving channel utilization via the reservation We develop a mathematical model to analyze the performance of proposed scheme and perform simulations to evaluate its performance compared with the original MAC

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