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Optimizing Voip Using A Cross Layer Call Admission Control Scheme

Author(s): Mumtaz AL-Mukhtar | Huda Abdulwahed

Journal: International Journal of Computer Networks & Communications
ISSN 0975-2293

Volume: 5;
Issue: 4;
Start page: 117;
Date: 2013;
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Keywords: VoIP C apacity | QoS | Cross - layering | VoWLAN | Codec Adaptation

Deployingwireless campus network becomes popular in many world universities for the services that areprovided.However, it suffers from different issues such as low VoIP network capacity, network congestioneffect on VoIP QoS and WLAN multi rate issue due to linkadaptation technique. In this paper a cross layercall admission control (CCAC) scheme is proposed to reduce the effects of these problems on VoWLANbased on monitoring RTCPRR(RealTime Control Protocol ReceiverReport)that provides the QoS levelfor VoIP and monitoring the MAC layer for any change in the data rate. If the QoS level degrades due toone of the aforementioned reasons, a considerable change in the packet size or the codec type will be thesolution. A wireless campus network issimulatedusing OPNET 14.5 modeler and many scenarios aremodeled to improve this proposed scheme.

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