Enhanced QoS Mechanisms for IEEE 802.11e Wireless Networks

Authors: Ho-Ting Wu, Min-Hua Yang, Kai-Wei Ke, Lei Yan

Abstract:

The quality-of-service (QoS) support for wireless LANs has been a hot research topic during the past few years. In this paper, two QoS provisioning mechanisms are proposed for the employment in 802.11e EDCA MAC scheme. First, the proposed call admission control mechanism can not only guarantee the QoS for the higher priority existing connections but also provide the minimum reserved bandwidth for traffic flows with lower priority. In addition, the adaptive contention window adjustment mechanism can adjust the maximum and minimum contention window size dynamically according to the existing connection number of each AC. The collision probability as well as the packet delay will thus be reduced effectively. Performance results via simulations have revealed the enhanced QoS property achieved by employing these two mechanisms.

Keywords: 802.11e, admission control, contention window, EDCA

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1070465

References:

[1] IEEE Standard for Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications, ISO/IEC 8802-11: 1999(E). Aug. 1999.
[2] " IEEE Standard for Information technology-Telecommunications and information exchange between systems-Local and metropolitan area networks-Specific requirements Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications Amendment 8: Medium Access Control (MAC) Quality of Service Enhancements, "IEEE 802.11e std-2005 (Amendment to IEEE 802.11, 1999 Edition)
[3] Qiang Ni, Lamia Romdhani and Thierry Turletti, "A Survey of QoS Enhancements for IEEE 802.11 Wireless LAN," Journal of Wireless Communications and Mobile Computing, Wiley. 2004: Volume 4, Issue 5: pp. 547-566
[4] Deyun Gao, Jianfei Cai, and King Ngi Ngan, "Admission Control in IEEE 802.11e Wireless LANs," IEEE Network Mag. Volume 19, Issue 4, July-Aug. 2005 Page(s):6-13
[5] Y. Xiao and H. Li, "Evaluation of Distribution Admission Control for the IEEE 802.11e EDCA," IEEE Commun. Mag., Vol. 42, No. 9, 2004, pp S20-24.
[6] Y. Xiao, H. Li, and S. Choi, "Protection and Guarantee for Voice and Video Traffic in IEEE 802.11e Wireless LANs," Proc. IEEE INFOCOM-04, vol. 3, Hong Kong, Mar. 2004, pp. 2152-62.
[7] M. Barry, A. T. Campbell, and A. Veres, "Distributed Control Algorithms for Service Differentiation in Wireless Packet Networks," Proc. IEEE INFOCOM -01, vol. 1, Anchorage, AK, 2001, pp. 582-90.
[8] A. Veres et al., "Supporting Service Differentiation in Wireless Packet Networks Using Distributed Control," IEEE JSAC, vol. 19, no. 10, 2001, pp. 2081-93.
[9] D. Gu and J. Zhang, "A New Measurement-based Admission Control Method for IEEE 802.11 Wireless Local Area Networks," Mitsubishi Elec. Research Lab. Tech. rep. TR-2003-122, Oct. 2003.
[10] L. Zhang and S. Zeadally, "HARMONICA: Enhanced QoS Support with Admission Control for IEEE 802.11 Contention-based Access," Proc. IEEE RTAS -04, Toronto, Canada, May 2004, pp. 64-71.
[11] D. Pong and T. Moors, "Call Admission Control for IEEE 802.11 Contention Access Mechanism," Proc. Globecom 2003, pp. 174-8, Dec. 1-5, 2003
[12] Y. C. Tay and K. C. Chua, "A capacity analysis for the IEEE 802.11 MAC protocol," ACM/Baltzer Wireless Networks, Volume 7, 2001 pp.159-171