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

Authors:
Wei Kuang Lai;Chin-Shiuh Shieh;Chih-Shiuan Jiang
Affiliations:
National Sun Yat-Sen University, Kaohsiung, Taiwan, R.O.C;Kaohsiung Univ. of Applied Sciences, Kaohsiung, Taiwan, R.O.C;National Sun Yat-Sen University, Kaohsiung, Taiwan, R.O.C
Venue:
Proceedings of the 3rd International Conference on Ubiquitous Information Management and Communication
Year:
2009

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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.