A Differentiated Service Model for Enhanced Distributed Channel Access (EDCA) of IEEE 802.11e WLANs |
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| Authors: | Jeng Farn Lee Wanjiun Liao Meng Chang Chen |
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| Institution: | (1) BL-422, Department of Electrical Engineering, National Taiwan University, Taipei, 106, Taiwan;(2) BL-608, Department of Electrical Engineering, National Taiwan University, Taipei, 106, Taiwan;(3) R614, Institute of Information Science, Academia Sinica, Taipei, 11529, Taiwan;(4) Graduate Institute of Communication Engineering, National Taiwan University, Taipei, Taiwan;(5) R802, Department of Electrical Engineering, National Taiwan University, Taipei, 106, Taiwan |
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| Abstract: | In this paper, we propose a new differentiated service model, referred to as Differentiated Service-EDCA (DS-EDCA), for the
Enhanced Distributed Channel Access (EDCA) of IEEE 802.11e wireless local area networks (WLANs). With DS-EDCA, both strict
priority and weighted fair service can be provided. The strict priority service is provided for high priority traffic through
carefully setting the EDCA parameter sets of lower priority traffic; the proportional fairness service is enabled by determining
the backoff intervals according to the distributed scheduling discipline (DFS). We also propose a hierarchical link sharing
model for IEEE 802.11e WLANs, in which AP and mobile stations are allocated different amounts of link resource. The performance
of DS-EDCA and EDCA is compared via ns-2 simulations. The results show that DS-EDCA outperforms the original EDCA in terms
of its support for both strict priority and weighted fair service. More importantly, DS-EDCA can be easily implemented, and
is compatible to the IEEE 802.11 Standard.
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| Keywords: | EDCA 802 11e strict priority weighted fair service hierarchical link sharing |
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