Modified HCCA mechanism for improving QoS support in IEEE 802.11e networks

Authors:
Yeong-Sheng Chen;Yuan-Wei Lee;Guang-Horng Huang
Affiliations:
National Taipei University of Education;National Taipei University of Education;National Taipei University of Education
Venue:
Mobility '08 Proceedings of the International Conference on Mobile Technology, Applications, and Systems
Year:
2008

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Abstract

Recently, QoS has become an active research topic in WLAN [2] technologies. IEEE 802.11e Medium Access Control (MAC) [3] standard proposes Hybrid Coordination Function (HCF), which is composed of HCCA (HCF Controlled Channel Access) and EDCA (Enhanced Distributed Channel Access) mechanism for QoS support. HCCA is a contention-free mechanism, and EDCA is a contention-based method. The former usually applies to the network that is managed by a coordinator. Given that most of the wireless environments belong to infrastructure networks with a coordinator, our study is focused on the discussion of HCF mechanism. In HCF mechanism, an AP can use the information of the association or reassociation frames transmitted by mobile stations to build a polling list. However, a station may not always have pending data to transmit, and therefore polling all the stations may waste time and will deteriorate the transmission performance. In this paper, we propose a modified HCCA mechanism which uses the beacon frame broadcasted by the AP to notify the STA that has pending data to transmit so as to improve the transmission performance. The simulation results show that the performance improvement of our proposed mechanism is significant for QoS support.