Distributed QoS control for link adaptive wireless LANs

Ryoichi Shinkuma, Junpei Maeda, Tatsuro Takahashi

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In wireless local area networks (WLANs), the necessity of quality-of-service (QoS) control for uplink flows is greater and greater with interactive applications being more popular. It is also important that fairness between flows transmitted by stations with different physical transmission rates is ensured in QoS control for link adaptive WLANs, which is widely used nowadays. In this paper, we propose a novel distributed access scheme to satisfy these requirements, called QC-DCA. QC-DCA adaptively controls the parameters of carrier sense multiple access with collision avoidance (CSMA/CA). QC-CDA has two QoS control functions: guarantee and classification. QC-DCA guarantees target throughputs and packet delays by quickly adjusting CSMA/CA parameters. In QoS classification, the difference of throughputs and packet delays between different QoS classes is maintained. In both of them, QC-DCA solves unfairness caused by difference of transmission rates in the physical layer. We evaluate throughput and delay performances of the proposed scheme through computer simulations. The results verify the viability of the proposed scheme.

Original languageEnglish
Title of host publication2005 Asia-Pacific Conference on Communications
Number of pages5
Publication statusPublished - 2005
Externally publishedYes
Event2005 Asia-Pacific Conference on Communications - Perth, Western Australia, Australia
Duration: 2005 Oct 32005 Oct 5

Publication series

Name2005 Asia-Pacific Conference on Communications


Conference2005 Asia-Pacific Conference on Communications
CityPerth, Western Australia

ASJC Scopus subject areas

  • General Engineering


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