A fair Access Mechanism Based on TXOP in IEEE 802.11e Wireless Networks. | [International Journal of Communication Networks and Information Security • 2016]

Author(s):

1. Marjan Yazdani: Department of Information Technology Engineering, Faculty of Computer Engineering, University of Isfahan, Isfahan, Iran

2. Maryam Kamali: Department of Information Technology Engineering, Faculty of Computer Engineering, University of Isfahan, Isfahan, Iran

3. Neda Moghim: Department of Information Technology Engineering, Faculty of Computer Engineering, University of Isfahan, Isfahan, Iran

4. Mahdieh Ghazvini: Computer Engineering Department, Faculty of Engineering, Shahid Bahonar University of Kerman, Kerman, Iran

Abstract:

IEEE 802.11e is an extension of IEEE 802.11 that provides Quality of Service (QoS) for the applications with different service requirements. This standard makes use of several parameters such as contention window; inter frame space time and transmission opportunity to create service differentiation in the network. Transmission opportunity (TXOP), which is the focus point of this paper, is the time interval during which a station is allowed to transmit packets without any further contention. As the fixed amounts of TXOPs are allocated to different stations, unfairness appears in the network. And when users with different data rates exist, IEEE 802.11e WLANs face the lack of fairness in the network. Because the higher data rate stations transfer more data compared to the lower rate ones. Several mechanisms have been proposed to solve this problem by generating new TXOPs adaptive to the network's traffic condition. In this paper, some proposed mechanisms are evaluated and according to their evaluated strengths and weaknesses, a new mechanism is proposed for TXOP determination in IEEE 802.11e wireless networks. The new algorithm considers data rate, channel error rate and data packet lengths to calculate adaptive TXOPs for the stations. The simulation results show that the proposed algorithm leads to better fairness. It also achieves higher throughput and lower delays in the network.

Page(s): 11-17

DOI: DOI not available

Published: Journal: International Journal of Communication Networks and Information Security, Volume: 8, Issue: 1, Year: 2016

Keywords:

TXOP , Fairness , MAC

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