RT Journal Article
T1 Application-aware scheduling for VoIP in wireless mesh networks
A1 Bayer, Nico
A1 Xu, Bangnan
A1 Rakocevik, Veselin
A1 Habermann, Joachim
AB Wireless Mesh Networks (WMNs) are seen as a means to provide last mile connections inNext Generation Networks (NGNs). Because of their auto configuration capabilities and thelow deployment cost WMNs are considered to be an efficient solution for the support ofmultiple voice, video and data services in NGNs. This paper looks at the optimal provisionof resources in WMNs for Voice over IP (VoIP) traffic, which has strict performance requirements in terms of delay, jitter and packet loss. In WMNs, because of the challenges introduced by wireless multi hop transmissions and limited resources, providing performancequality for VoIP comparable to the voice quality in the traditional circuit switched networks is a major challenge.This paper analyses different scheduling mechanisms for TDMA based access control inmesh networks as specified in the IEEE 802.16 2004 WiMAX standard. The performance ofthe VoIP applications when different scheduling mechanisms are deployed is analysed on avariety of topologies using ns 2 simulation and mathematical analysis. The paper concludes that on demand scheduling of VoIP traffic typically deployed in 802.11 basedWMNs is not able to provide the required VoIP quality in realistic mesh WiMAX networkscenarios and is therefore not optimal from a network operator’s point of view. Instead, it isshown, that continuous scheduling is much better suited to serve VoIP traffic. The paperthen proposes a new VoIP aware resource coordination scheme and shows, through simulation, that the new scheme is scalable and provides good quality for VoIP service in a widerange of network scenarios. The results shown in the paper prove that the new scheme isresilient to increasing hop count, increasing number of simultaneous VoIP sessions and thebackground traffic load in the network. Compared to other resource coordination schemesthe VoIP aware scheduler significantly increases the number of supported calls.
PB Elsevier
SN 1389-1286
YR 2010
FD 2010-02-15
LK https://hdl.handle.net/10016/13621
UL https://hdl.handle.net/10016/13621
NO European Community's Seventh Framework Program
DS e-Archivo
RD 8 may. 2024