Service Differentiation in IEEE 802.11e HCF Access Method

Authors:
Whe-Dar Lin;Der-Jiunn Deng
Affiliations:
Department of Accounting and Information Technology, The Overseas Chinese Institute of Technology, Taiwan, R.O.C.;Department of Computer Science and Information Engineering, National Changhua University of Education, Taiwan, R.O.C.
Venue:
PCM '08 Proceedings of the 9th Pacific Rim Conference on Multimedia: Advances in Multimedia Information Processing
Year:
2008

Citing 2
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Abstract

As the demand for broadband multimedia wireless is increasing, there is a great need for quality of service (QoS). The IEEE 802.11e workgroup proposes the hybrid coordination function (HCF) channel access mechanisms, which includes two mechanisms: enhanced distributed channel access (EDCA) and HCF control channel access (HCCA). The EDCA is a contention-based scheme and supports service differentiation through prioritiesed access to the wireless medium. The HCCA works under the control of a hybrid coordinator (HC) and provides a centralised polling scheme. In this paper, we evaluate and compare the performance of HCCA and EDCA for constant bit rate (CBR) traffic transmission. The results show that both access methods are able to carry the prioritized traffic.