Fair round robin binary countdown to achieve QoS guarantee and fairness in WLANs |
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Authors: | Huei-Wen Ferng Chandra Setiadji Alexander Leonovich |
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Affiliation: | (1) Department of Computer Science and Information Engineering, National Taiwan University of Science and Technology, Taipei, 106, Taiwan |
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Abstract: | How to guarantee both quality of service (QoS) and fairness in wireless local area networks (WLANs) is a challenging issue.
To touch this issue, a fair medium access control (MAC) scheme called fair round robin binary countdown (FRRBC) adopting the
eminent concepts of allowance and binary countdown is proposed in this paper. FRRBC can guarantee QoS for both audio and video
with the aid of adaptive adjustment on system parameters and some extra rules designed according to delay bounds. Using multiple
mapping functions from allowances to fixed-bit binary numbers to indicate different priorities, FRRBC not only provides guaranteed
system performance but also achieves good fairness. Finally, we demonstrate that FRRBC can significantly outperform the enhanced
distributed channel access (EDCA) (IEEE 802.11 WG in IEEE Standard for Information technology—Telecommunications and information
exchange between systems—Local and metropolitan area networks—Specific requirements—Part 11: Wireless LAN Medium Access Control
(MAC) and Physical Layer (PHY) Specifications. Amendment 8: Medium Access Control (MAC) Quality of Service Enhancements, 2005)
and the synchronized medium access control (SYN-MAC) (Wu HY et al. in Mobile Netw Appl 11:627–637, 2005) because of its superiority
to offer guaranteed QoS for both audio and video, low delay jitter, low blocking ratio, and good fairness. Of course, FRRBC
can be illustrated to be a better choice than the enhanced distributed elastic round robin (EDERR) (Ferng HW, Liau HY in
IEEE Trans Mobile Comput 8(7):880–894, 2009). |
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