Publication: Application-aware scheduling for VoIP in wireless mesh networks
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ISSN: 1389-1286
Publication date
2010-02-15
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Elsevier
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Abstract
Wireless Mesh Networks (WMNs) are seen as a means to provide last mile connections in
Next Generation Networks (NGNs). Because of their auto configuration capabilities and the
low deployment cost WMNs are considered to be an efficient solution for the support of
multiple voice, video and data services in NGNs. This paper looks at the optimal provision
of resources in WMNs for Voice over IP (VoIP) traffic, which has strict performance require
ments in terms of delay, jitter and packet loss. In WMNs, because of the challenges intro
duced by wireless multi hop transmissions and limited resources, providing performance
quality for VoIP comparable to the voice quality in the traditional circuit switched net
works is a major challenge.
This paper analyses different scheduling mechanisms for TDMA based access control in
mesh networks as specified in the IEEE 802.16 2004 WiMAX standard. The performance of
the VoIP applications when different scheduling mechanisms are deployed is analysed on a
variety of topologies using ns 2 simulation and mathematical analysis. The paper con
cludes that on demand scheduling of VoIP traffic typically deployed in 802.11 based
WMNs is not able to provide the required VoIP quality in realistic mesh WiMAX network
scenarios and is therefore not optimal from a network operator’s point of view. Instead, it is
shown, that continuous scheduling is much better suited to serve VoIP traffic. The paper
then proposes a new VoIP aware resource coordination scheme and shows, through simu
lation, that the new scheme is scalable and provides good quality for VoIP service in a wide
range of network scenarios. The results shown in the paper prove that the new scheme is
resilient to increasing hop count, increasing number of simultaneous VoIP sessions and the
background traffic load in the network. Compared to other resource coordination schemes
the VoIP aware scheduler significantly increases the number of supported calls.
Description
Keywords
Wireless mesh network, Voice over IP–VoIP, Quality of service, QoS Delay Jitter Packet error rate Multi, Hop Triple Play R, Score
Bibliographic citation
Computer Networks (2010), 54(2), 257-277