A survey of QoS enhancements for IEEE 802.11 wireless LAN: Research Articles
Wireless Communications & Mobile Computing
FHCF: a simple and efficient scheduling scheme for IEEE 802.11e wireless LAN
Mobile Networks and Applications
Wireless medium access control protocols
IEEE Communications Surveys & Tutorials
A scheduling algorithm for QoS support in IEEE802.11 networks
IEEE Wireless Communications
ARROW: An Efficient Traffic Scheduling Algorithm for IEEE 802.11e HCCA
IEEE Transactions on Wireless Communications
Contention window optimization for ieee 802.11 DCF access control
IEEE Transactions on Wireless Communications - Part 1
Quality-of-service provisioning system for multimedia transmission in IEEE 802.11 wireless LANs
IEEE Journal on Selected Areas in Communications
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In broadband wireless networks, providing Quality of Service (QoS) support for multimedia traffics is no doubt crucial to many application requirements such as real-time audio and video streaming communications. IEEE 802.11e Medium Access Control (MAC) standard proposes Hybrid Coordination Function (HCF), which is composed of HCF Controlled Channel Access (HCCA) and Enhanced Distributed Channel Access (EDCA) mechanisms for QoS support. HCCA performs a polling procedure with parameterized channel. However, a station may not always have pending data to transmit. That is, polling all the stations may waste time and therefore deteriorate the transmission performance. In this paper, we propose a modified HCCA mechanism using the beacon frame broadcasted by the AP to determine which station can transmit its pending data so as to improve the transmission performance. The simulation results show that the performance improvement of our proposed mechanism is significant for QoS support particularly under light load condition.