Effective Bandwidth Utilization in IEEE802.11 for VOIP

TL;DR

This paper proposes a Bandwidth Data Rate Moderation (BDM) algorithm for IEEE 802.11 WLANs to optimize VoIP bandwidth utilization, enhancing voice quality and increasing call capacity by maintaining 1-5% free bandwidth.

Contribution

Introduction of the BDM algorithm that dynamically adjusts bandwidth usage based on IEEE 802.11b data rates to improve VoIP performance and capacity.

Findings

BDM increases VoIP call capacity.

Maintains 1-5% free bandwidth for better voice quality.

ns2 simulations validate improved bandwidth utilization.

Abstract

Voice over Internet protocol (VoIP) is one of the most important applications for the IEEE 802.11 wireless local area networks (WLANs). For network planners who are deploying VoIP over WLANs, one of the important issues is the VoIP capacity. VoIP bandwidth consumption over a WAN is one of the most important factors to consider when building a VoIP infrastructure. Failure to account for VoIP bandwidth requirements will severely limit the reliability of a VoIP system and place a huge burden on the WAN infrastructure. Less bandwidth utilization is the key reasons for reduced number of channel accesses in VOIP. But in the QoS point of view the free bandwidth of atleast 1-5% will improve the voice quality. This proposal utilizes the maximum bandwidth by leaving 1-5% free bandwidth. A Bandwidth Data rate Moderation (BDM) algorithm has been proposed which correlates the data rate specified in IEEE802.11b with the free bandwidth. At each time BDM will calculate the bandwidth utilization before sending the packet to improve performance and voice quality of VoIP. The bandwidth calculation in BDM can be done by using Erlang and VOIP bandwidth calculator. Finally, ns2 experimental study shows the relationship between bandwidth utilization, free bandwidth and data rate. The paper concludes that marginal VoIP call rate has been increased by BDM algorithm.