Analysis of temporal and throughput fair scheduling in multirate WLANs |
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| Affiliation: | 1. Institute of Transportation Studies (EECS and CEE), University of California Berkeley, 604 Davis Hall, Berkeley, CA 94720-1710, United States;2. Department of Electrical and Computer Engineering, Texas A&M University, Qatar;1. Wireless Networks Laboratory (WNL), Department of Computer Engineering, Iran University of Science and Technology, Tehran, Iran;2. Next-generation and Wireless Communications Laboratory (NWCL), Department of Electrical and Electronics Engineering, Koc University, Istanbul, Turkey;1. Information and Communications Research Laboratories ITRI, Chutung, Hsinchu 31040, Taiwan, ROC;2. Department of Computer Science National Chiao Tung University, Hsinchu 30010, Taiwan, ROC;1. Sorbonne universités, Université de technologie de Compiègne, CNRS, Heudiasyc UMR 7253, Compiègne, France;2. Institute of Telecommunications, Warsaw University of Technology, Warsaw, Poland;3. LIRMM, Université de Montpellier, CNRS, Montpellier, France;4. French National Center for Scientific Research (CNRS), France;1. Department of Computing and Mathematics, FFCLRP, University of São Paulo (USP), 14040-901 Ribeirão Preto, SP, Brazil;2. Centre for Computational Intelligence (CCI), School of Computer Science and Informatics, De Montfort University, Leicester LE1 9BH, UK;1. State Key Laboratory of Nuclear Physics and Technology &School of Physics, Peking University, Beijing 100871, China;2. Paul Scherrer Institute, Laboratory for Neutron Scattering and Imaging, Villigen, CH5232, Switzerland;1. School of Communications and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China;2. Institute of Electronic Engineering and Networking, Chongqing University of Posts and Telecom, Chongqing 400065 China;3. Department of Information Science and Technology, The Pennsylvania State University, Abington, PA 19001, USA;4. Department of Mathematics and Computer Science, Nicholls State University, Thibodaux 70310, USA;5. School of Information Technology, Deakin University, Melbourne 3125, Australia |
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| Abstract: | The IEEE 802.11e Wireless Local Area Network (WLAN) provides controlled access features that can be used in conjunction with scheduling algorithms to provide guaranteed per-session services. However, the multirate operation of the WLAN complicates the design of scheduling and Quality of Service (QoS) provisioning algorithms. We propose a new solution based on Controlled Access Phase Scheduling (CAPS) framework, introduced for fixed rate WLANs in our earlier works, and employ a new fair central scheduler to achieve guaranteed fair services in a WLAN. We examine the fairness issues involved in designing such an algorithm and study several fair scheduling algorithms that can be used with CAPS. We present a modified start time fair queuing based scheduler as our choice and analyze its performance under dynamic and static multirate operation. The algorithm is then evaluated through several simulation experiments. We show that the enhanced CAPS is able to adapt to multirate environments and provide both temporal and throughput fair services in 802.11e WLANs. |
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