Transmission of VoIP Traffic in Multihop Ad Hoc IEEE 802.11b Networks: Experimental Results
WICON '05 Proceedings of the First International Conference on Wireless Internet
Impact of background traffic on speech quality in VoWLAN
Advances in Multimedia
User-level performance evaluation of VoIP using ns-2
Proceedings of the 2nd international conference on Performance evaluation methodologies and tools
Joint routing and playout buffering of IP telephony flows in MANETs
Mobile Networks and Applications
Simulation study of VoIP performance in IEEE 802.11 wireless mesh networks
MACOM'10 Proceedings of the Third international conference on Multiple access communications
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In this paper, a performance evaluation of VoIP over ad hoc networks in emergency scenarios is presented. In these scenarios, emergency workers need to act and communicate with each other in disaster areas that significantly differ from the usual scenarios found in the literature. Obstacles placed in the network area pose limitations to nodes' mobility and signal propagation with considerable impact on the voice quality. Simulations based on the Human Obstacle Mobility model (HUMO) have been performed in order to quantify the performance degradation due to the presence of obstacles. In doing so, network performance metrics and human perception metrics based on the extended E-model have been used. It is shown how different voice codecs behave in different obstacle coverage and mobility scenarios. Furthermore, MOS distribution is approximated. Results underline the importance of simulation environment to the derivation of realistic results concerning VoIP quality.