Performance evaluation of a WiMAX testbed under VoIP traffic
WiNTECH '06 Proceedings of the 1st international workshop on Wireless network testbeds, experimental evaluation & characterization
Empirical evaluation of VoIP aggregation over a fixed WiMAX testbed
Proceedings of the 4th International Conference on Testbeds and research infrastructures for the development of networks & communities
Computer Networks: The International Journal of Computer and Telecommunications Networking
A comparative analysis of the perceived quality of VoIP under various wireless network conditions
WWIC'10 Proceedings of the 8th international conference on Wired/Wireless Internet Communications
Survey on application-layer mechanisms for speech quality adaptation in VoIP
ACM Computing Surveys (CSUR)
The effects of network neutrality on the diffusion of new Internet application services
Telematics and Informatics
| Hi-index | 0.00 |
Quality models predict the perceptual quality of services as they calculate subjective ratings from measured parameters. In this article, we present a new quality model that evaluates Voice over IP (VoIP) telephone calls. In addition to packet loss rate, coding mode and delay, it takes into account the impairments due to changes in the transmission configuration (e.g. switching the coding mode or re-scheduling the playout time). Moreover, this model can be used at run time to control the transmission of such calls. It is also computationally efficient and open source.To demonstrate the potential of our model, we apply it to select the ideal coding and packet rate in bandwidth-limited environments. Furthermore, we decide, based on model predictions, whether to delay the playout of speech frames after delay spikes. Delay spikes often occur after congestion and cause packets to arrive too late. We show a considerable improvement in perceptual speech quality if our model is applied to control VoIP transmissions. Copyright © 2005 John Wiley & Sons, Ltd.It is an enhanced and extended version of [55]