Title

A New Framework For Qos Provisioning In Wlans Using P-Persistent 802.11 Mac

Keywords

802.11; Admission control; p-persistent; QoS; Scheduler; Service differentiation

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 802.11e EDCF protocol uses the same set of parameters viz., CWmin, CWmax, 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 core 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. © 2008 Elsevier B.V. All rights reserved.

Publication Date

11-20-2008

Publication Title

Computer Communications

Volume

31

Issue

17

Number of Pages

4035-4048

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.comcom.2008.08.013

Socpus ID

54949098824 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/54949098824

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