A delay-based admission control mechanism for multimedia support in IEEE 802.11e wireless LANs |
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Authors: | Bechir Hamdaoui Moncef Elaoud Parameswaran Ramanathan |
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Institution: | (1) Telecommunications Research Laboratory, Toshiba Research Europe Ltd., 32, Queen Square, Bristol, BS1 4ND, UK |
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Abstract: | Multimedia over IEEE 802.11 wireless local area networks (WLANs) has recently been the focus of many researchers due to its
rapidly increasing popularity. Unlike their best-effort counterparts, multimedia applications have quality of service (QoS)
needs typically expressed in terms of the maximum allowed delay and/or the minimum required throughput. Therefore, prior to
accepting a multimedia application, the network must assure the satisfaction of its QoS requirements. In this paper, we develop
a mechanism that can be used to control the admissibility of multimedia applications into WLANs. To develop the proposed mechanism,
we first derive an analytical approximation of the delay experienced by packets when travelled through these networks. The
analytical approximation of the delay is then used to propose an admission control mechanism for the enhanced distributed
channel access (EDCA) method used by the hybrid coordination function (HCF) of IEEE 802.11e. The proposed delay-based admission
control mechanism is validated via simulations of voice traffic. |
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