Maximizing transmission time (MTT): a distributed MAC scheme for enhancing wireless LAN performance

Authors:
Xin Gang Wang;Geyong Min;John E. Mellor;Lin Guan
Affiliations:
Mobile Computing and Networks Research Group, Department of Computing, School of Informatics, University of Bradford, Bradford, UK;Mobile Computing and Networks Research Group, Department of Computing, School of Informatics, University of Bradford, Bradford, UK;Mobile Computing and Networks Research Group, Department of Computing, School of Informatics, University of Bradford, Bradford, UK;Mobile Computing and Networks Research Group, Department of Computing, School of Informatics, University of Bradford, Bradford, UK
Venue:
Mobile Networks and Applications
Year:
2005

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Abstract

Distributed contention-based Medium Access Control (MAC) protocols are the fundamental components for IEEE 802.11 type Wireless LANs (WLAN). The deficiency of these types of MAC protocols mainly comes from the idle slots used to contend the channel and from the transmission collisions due to the same backoff slot value being generated. Assigning the same transmission opportunity to various length packets also degrades the system performance. This study takes account of the above issues and presents a new MAC scheme called Maximizing Transmission Time (MTT) to enhance the wireless LAN performance. This scheme allows each station to transmit a burst of packets after winning a transmission opportunity instead of just one packet. This idea can reduce the average number of waiting slots and collision probability in each transmission cycle. Moreover, in order to ensure fairness among stations, a maximum transmission period is assigned to each station for controlling the length of the bursty transmission. An analytical performance model is derived for computing the throughput of the MTT scheme. The extensive simulation experiments reveal that the proposed method can enhance the wireless LANs performance significantly with high throughput, low delay and high degree of fairness.