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Performance enhancement for IEEE 802.11e networks by adaptive adjustment of the HCCA/EDCA ratio

Published: 15 February 2009 Publication History

Abstract

To reduce the average delay and to improve the overall system throughput in IEEE 802.11e environment, a novel scheme for the adaptive adjustment of the ratio of HCCA and EDCA periods is developed and presented in this article. The fundamental idea is to choose favorable transfer modes for traffics with different characteristics. The ratio of HCCA and EDCA periods can be dynamically adjusted by changing the CAPLimit value, which specifies the maximal permissible duration for HCCA. A two-phase algorithm is designed to adaptively adjust the CAPLimit value based on measured system dynamics. In Phase 1, coarse-grain adjustment was made to the CAPLimit value according to the measured ratio of CBR-prone traffics and VBR-prone traffics. In Phase 2, the CAPLimit value is subject to fine-tuning based on observed system throughput. Simulation results reveal that the proposed scheme can effectively reduce the average delay and, in the same time, is capable of maintaining or even improving the total throughput.

References

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IEEE 802.11 WG, Reference number ISO/IEC 8802-11: 1999(E) IEEE Std 802.11, 1999 edition. International 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," 1999.
[2]
IEEE 802.11 WG, Draft Supplement to Standard for Information technology -- Telecommunications and information exchange between systems -- Local and metropolitan area networks -- Specific requirements -- "Part 11: Wireless Medium Access Control (MAC) and Physical Layer (PHY) specifications: Amendment: Medium Access Control (MAC) Quality of Service (QoS) Enhancements," IEEE P802.11e/Draft 13.0, January, 2005.
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Pierre Ansel, Qiang Ni, and Thierry Turletti, "An efficient scheduling scheme for IEEE 802.11e," INRIA Research Report, 2003.
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W. Pattara-Atikom, P. Krishnamurthy, and S. Banerjee, "Distributed mechanisms for quality of service in wireless LANs," IEEE Wireless Communications, vol. 10, pp. 26--34, 2003.
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Wei Liu, Wenjing Lou, Xiang Chen, and Yuguang Fang, "A QoS-enabled MAC architecture for prioritized service in IEEE 802.11 LANs," Proceedings of the IEEE 2003 Global Communications Conference, no. 1, pp.3802--3807, 2003.
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Lassâd Gannoune and Stephan Robert, "Dynamic tuning of contention window minimum (CWmin) for enhanced service differentiation in IEEE 802.11 wireless ad-hoc networks," Proceedings of the IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, vol. 4, pp. 2956--2961, 2004.
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HCF/EDCF NS-2 Stanford implementation, http://nondot.org/~radoshi/cs444n
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  • (2012)Improved utilization for joint HCCA–EDCA access in IEEE 802.11e WLANsOptimization Letters10.1007/s11590-012-0517-17:8(1711-1724)Online publication date: 8-Jul-2012

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      cover image ACM Conferences
      ICUIMC '09: Proceedings of the 3rd International Conference on Ubiquitous Information Management and Communication
      February 2009
      704 pages
      ISBN:9781605584058
      DOI:10.1145/1516241
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      Published: 15 February 2009

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      Author Tags

      1. 802.11e
      2. CBR
      3. EDCA
      4. HCCA
      5. VBR

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      • (2012)Improved utilization for joint HCCA–EDCA access in IEEE 802.11e WLANsOptimization Letters10.1007/s11590-012-0517-17:8(1711-1724)Online publication date: 8-Jul-2012

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