Network-Load Aware Adaptive Channel Access Control for WLAN


Wireless local area network (WLAN) brings us a low cost and high bandwidth experience and thus plays a critically important role in current/future networks to support high-rate transmissions. To better provide quality-of-service (QoS) for WLAN users, we in this paper propose an improved scheme called “A-EDCA”(adaptive EDCA), based on enhanced distributed channel access (EDCA) of IEEE 802.11e under the infrastructure mode. Our proposed scheme aims at efficiently adapting the transmission over WLAN to the time-varying network conditions and mitigating the competition ability unfairness between access point (AP) and non-AP stations (STAs). Specifically, all non-AP STAs adaptive-ly modify the contention window based on the network condition. Moreover, AP skips the backoff phase by setting its backoff counter as zero when non-AP STA completes transmission successfully to relieve the unfairness. At last, simulation results demonstrate the effectiveness of the proposed approach.

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Wu, X. , Du, Q. and Ren, P. (2013) Network-Load Aware Adaptive Channel Access Control for WLAN. Communications and Network, 5, 461-466. doi: 10.4236/cn.2013.53B2085.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications, ISO/IEC IEEE 802.11 Standard, 2005.
[2] Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications: Medium Access Control (MAC) Quality of Service Enhancements, ISO/ IEC IEEE 802.11 Stan-dard, 2005.
[3] F. Cali, M. Conti and E. Gregori, “IEEE 802.11 Wireless LAN: Capacity Analysis and Protocol Enhancement,” 17th Annual Joint Conference of the IEEE Computer and Communications Societies, March 1998, pp. 142-149.
[4] G. Bianchi, “Performance Analysis of the IEEE 802.11 Distributed Coordination Function,” IEEE Journal on Selected Areas in Communications, Vol. 18, 2000, pp. 535-547.
[5] Z.-n. Kong, D. H. K. Tsang and B. Bensaou, “Performance Analysis of IEEE 802.11e Contention-Based Channel Access,” IEEE Journal on Selected Areas in Communications, Vol. 22, No. 10, 2004, pp. 2095-2106.
[6] F. Cali, M. Conti and E. Gregori, “Dynamic Tuning of the IEEE 802.11 Protocol to Achieve a Theoretical Through-put Limit,” IEEE Transactions on Networking, December 2000, pp. 785-799.
[7] J. C. Tay and K. C. Chua, “A Capacity Analysis for the IEEE 802.11 MAC Protocol,” Wireless Networks, Vol. 3, No. 3, 2001, pp. 159-171.
[8] J. W. Tantra, H. F. Chuan and A. B. Mnaouer, “Through-put and Delay Analysis of the IEEE 802.11e ED CA Saturation,” IEEE International Conference on Communications (ICC), Vol. 5, May 2005, pp. 3450-3454.
[9] X. Yang, “Enhanced DCF of IEEE 802.11e to Support QoS,” IEEE WCNC, 2003.
[10] A. Veres, A. T. Campbell, M. Barry and L. H. Sun, “Supporting Differentiation in Wireless Packet Networks Using Distributed Control,” IEEE Journal on Selected Areas in Communications, Vol. 19, No. 10, 2001, pp. 2081-2093.
[11] A. Leonovich and H.-W. Ferng, “A Time Slots Coordination Mechanism for IEEE 802.11 WLANs,” IEEE Communications Letters, Vol. 14, No. 4, 2010, pp. 360-362.
[12] G. W. Wong and R. W. Donaldson, “Improving the QoS Performance of EDCF in IEEE 802.11e Wireless LANs,” IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (PACRIM), Vol. 1, August 2003, pp. 392-396.
[13] P. Patras, A. Banchs and P. Serrano, “A Control Theoretic Approach for Through-put Optimization in IEEE 802.11e EDCA WLANs,” Mobile Networks and Applications, Vol. 14, No. 6, 2009, pp. 697-708.
[14] Y. Q. Dong, Y. Wang and Q. Xia, “A Load Adaptive IEEE 802.11e EDCA Backoff Scheme with Enhanced Service Differentiation,” IEEE International Conference on Communication Technology, November 2010, pp. 1056-1059.
[15] T. Nilsson and J. Farooq, “A Novel MAC Scheme for Solving the QoS Parameter Adjustment Problem in IEEE 802.11e EDCA,” IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks, 2008, pp. 1-9.

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