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A contribution to performance analysis approach of the IEEE 802.11 EDCA in wireless multi hop networks

This paper proposes an analytical model which covers full specification of IEEE 802.11e EDCA. To reduce the complexity, the model is simplified by decomposing the problem in two models based on Markov chain that can be easily solved by numerical method. The proposed model is presented in the theoretical aspect as well as numerical results to clarify its accuracy. | VNU Journal of Science: Comp. Science & Com. Eng., Vol. 31, No. 1 (2015) 45-54 A Contribution to Performance Analysis Approach of the IEEE 802.11 EDCA in Wireless Multi-hop Networks Minh Trong Hoang*, Minh Hoang, Duc Cong Le Posts and Telecommunications Institute of Technology, Hanoi, Vietnam Abstract The IEEE 802.11e standard has been introduced to support service differentiation for wireless local area networks. In wireless multi-hop networks, the performance of IEEE 802.11e EDCA has to confront with some practical problems such as unsaturation traffic and hidden node problem. Hence, this problem has attracted numerous studies in recent years, in which several investigations use analytic model to evaluate the performance due to its accuracy aspect. However, the accuracy and complexity of analytical model depends on a range of assumed parameters. The complexity caused by the introduction of realistic conditions in wireless multi-hop networks is the major challenge of current studies in this field. To overcome this challenge, this paper proposes an analytical model which covers full specification of IEEE 802.11e EDCA. To reduce the complexity, the model is simplified by decomposing the problem in two models based on Markov chain that can be easily solved by numerical method. The proposed model is presented in the theoretical aspect as well as numerical results to clarify its accuracy. © 2015 Published by VNU Journal of Science. Manuscript communication: received 01 December 2014, revised 29 January 2015, accepted 10 February 2015 Corresponding author: Minh Trong Hoang, hoangtrongminh@ptit.edu.vn Keywords: IEEE 802.11e EDCA, Virtual collision, Multi-hop network, Hidden node, Markov chain. 1. Introduction The IEEE 802.11 has become ubiquitous and gained widespread popularity for wireless multi-hop networks. To adapt the quality of service requirements of multi-media applications, the IEEE 802.11e Enhanced Distributed Channel Access (EDCA) has been standardized .