On-the-fly VoIP call quality evaluation with improved E-model

This paper presents an improvement to an existing VoIP call quality model in the context of mobile networks, that works on-the-fly and deals with uncertainty. Subjective call quality evaluation with real people is expensive and hard to setup. Network engineers would benefit from automated means to approximate these subjective measures, such as the ITU-T E-model, in the development and planning phases. We have improved this call quality model to allow on-the-fly measurement while dealing with uncertainty inherent to the model, included additional corrections, and implemented it as a ns-2 module. Accurate and on-the-fly evaluation also enables further analysis and optimization tasks, such as those performed in previous work. We compare our version against the original definition of the E-model and present further results from our simulations.