Abstract
Proposed article analyses dependence of MOS as a voice call quality (QoS) measure estimated through ITU-T E-model under real network conditions with jitter. In this paper, a method of jitter effect is proposed. Jitter as voice packet time uncertainty appears as increased packet loss caused by jitter memory buffer under- or overflow. Jitter buffer behaviour at receiver’s side is modelled as Pareto/D/1/K system with Pareto-distributed packet interarrival times and its performance is experimentally evaluated by using statistic tools. Jitter buffer stochastic model is then incorporated into E-model in an additive manner accounting for network jitter effects via excess packet loss complementing measured network packet loss. Proposed modification of E-model input parameter adds two degrees of freedom in modelling: network jitter and jitter buffer size.
Highlights
Mean opinion score - MOS - represents user satisfaction with overall listening and conversational quality on five grade scale from 5 to 1
E-model defined by ITU-T G.107 [1] is widely accepted objective method used for estimation of VoIP call quality
E-model uses set of selected input parameters to calculate intermediate variable – R factor, which is consecutively converted to MOS value using (3)
Summary
Mean opinion score - MOS - represents user satisfaction with overall listening and conversational quality on five grade scale from 5 (best) to 1 (worst). MOS can be estimated by either subjective methods based on user listening tests or by objective methods based on measured network parameters such as delay, packet loss and jitter. E-model uses set of selected input parameters to calculate intermediate variable – R factor, which is consecutively converted to MOS value using (3). Where Ie represents impairment factor given by codec compression and voice reproduction capabilities, Bpl is codec robustness, which describes how immune is particular codec against random losses and what are its PLC masking qualities. These values are given for narrowband codecs in ITU-T G.133 appendix [5]. An easiest way to comply with the conference paper formatting requirements is to use this document as a template and type your text into it
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