A new framework for QoS provisioning in WLANS using p-persistent 802.11 MAC

    Authors

    K. Anna;M. Bassiouni

    Comments

    Authors: contact us about adding a copy of your work at STARS@ucf.edu

    Abstract

    In this paper, we propose a new framework which consists of three components viz., a p-persistent 802.11-based core MAC layer which provides optimum channel utilization, a scheduler that provides service differentiation between different classes of traffic in the contention phase of 802.11 and an admission control which provides statistical QoS guarantees. The current 802.11 e EDCF protocol uses the same set of parameters viz.. CW(min), CW(max), CW, AIFS, and PF for both channel access and service differentiation. We show that using these parameters to achieve a specific desired throughput differentiation is a very cumbersome task. We present detailed performance results of our framework using the NS2 simulator to demonstrate the effectiveness of the scheduler and the core MAC layer. Compared to 802.11 adaptive EDCF, our scheduler consistently achieves the desired throughput differentiation and easy tuning. The care MAC layer achieves better delays in terms of channel access, average packet service time and one hop delay and also achieves higher system throughput than the AEDCF for a given service differentiation ratio. We also develop an analytical model for the p-persistent 802.11 in the core MAC layer under unsaturated load conditions and present closed forms for the average packet service time and one hop delay. We consider both the "no retry limit" and "finite retry limit" cases and validate the analytical model by extensive simulation results. (C) 2008 Elsevier B.V. All rights reserved.

    Journal Title

    Computer Communications

    Volume

    31

    Issue/Number

    17

    Publication Date

    1-1-2008

    Document Type

    Article

    First Page

    4035

    Last Page

    4048

    WOS Identifier

    WOS:000261362400016

    ISSN

    0140-3664

    Share

    COinS