Objective Assessment Methodology for Estimating Conversational Quality in VoIP

Takahashi, Akihiro; Kurashima, Atsuko; Yoshino, Hideaki

doi:10.1109/tasl.2006.883261

Cited by 39 publications

(19 citation statements)

References 6 publications

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“…However, there are no ITU-T standards at present that have been standardized for VoIP quality measurement of the above, although there are a few research works which have focused on Asian languages, such as Japanese and Chinese (excluding Thai language) that proposed the modified or enhanced ITU-T standard [7][8][9]. Therefore, it can be implied that the ITU-T standards (e.g., PESQ and E-model) may not be a good fit for VoIP quality measurement of Thai users who use the Thai language and have their own culture.…”

Section: Reasons Of the Study With Thai Usersmentioning

confidence: 99%

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VoIP quality measurement: subjective VoIP quality estimation model for G.711 and G.729 based on native Thai users

Daengsi¹,

Khitmoh

Wuttidittachotti

2015

Multimedia Systems

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Section: Reasons Of the Study With Thai Usersmentioning

confidence: 99%

“…Besides, there are several previous works that conducted subjective tests as other parts of study, as shown in Table 3 [7,8,24,61,62]. However, subjective results were mainly used for comparison with objective results.…”

Section: Related Workmentioning

confidence: 99%

VoIP quality measurement: subjective VoIP quality estimation model for G.711 and G.729 based on native Thai users

Daengsi¹,

Khitmoh

Wuttidittachotti

2015

Multimedia Systems

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“…A Japanese version of MOS was proposed in [14], in which a linear regression mapping function was applied to convert the E-Model MOS to Japanese E-Model MOS.…”

Section: A Research About E-modelmentioning

confidence: 99%

Accuracy analysis on call quality assessments in voice over IP

Han

Fitzpatrick

Murphy

et al. 2013

6th Joint IFIP Wireless and Mobile Networking Conference (WMNC)

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Abstract-Voice over IP (VoIP) now has tremendous influence on the telecommunication market with its flexibility and price advantage. Users of VoIP expect call quality to be as good as, if not better than the traditional Public Switched Telephone Network (PSTN). However in VoIP, factors that are related to the IP transport network such as packet loss, delay, bandwidth, jitter, and voice encoding (codec) all affect call quality. Call quality assessment in VoIP systems is mainly conducted with off-line tests using the Perceptual Evaluation of Speech Quality (PESQ) [1] methodology. Another method that can be utilised is an on-line approach using the E-Model, which can be used in real time. However, these two methods have limits and inaccuracy, and often do not give the same results. Call quality assessment is often used to adjust system and codec parameters. Therefore, given inaccurate results, the system would decrease the adjustment efficiency or even inadvertently decrease call quality. The primary contribution of this paper is a comparison between the accuracy of PESQ and the E-Model investigated by conducting an extensive set of experiments in a real enterprise network using a widely deployed Voice over IP (VoIP) product. Experiments were conducted under varying controlled network conditions. The results show that under various conditions, loss rates, codecs and across a range of languages that there can be significant differences between the call quality measurement obtained when using the E-model versus a PESQ analysis.

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“…In [6], authors presented a voice quality measurement tool based on the E-model. A framework of objective assessment method for estimating conversational quality in VoIP was proposed in [28]. In [5], a simplified versions of the E-model were proposed to simplify the calculations and focus on the most important factors required for monitoring the call quality.…”

Section: Introductionmentioning

confidence: 99%

A New Non-intrusive Model for Measuring VoLTE Quality based on Wideband E-model

Nguyen¹,

Nguyen²,

Renault³

2016

CAE

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Long Term Evolution (LTE) was initially designed for a high data rates network. However, voice service is always a main service that brings a big benefit for mobile operators. Hence the deployment of Voice over LTE (VoLTE) is very essential and urgent. LTE network is a fully All-IP network, thus, the deployment of VoLTE is very complex, specially for guaranteeing of Quality of Service (QoS) to meet quality of experience of mobile users. The key purpose of this paper is to present an object, nonintrusive prediction model for VoLTE quality based on LTE-Sim framework and Wideband (WB) E-model. In order to simulate the experiment, we deployed LTE-Sim framework combining C programming in Matlab software. The outputs of the LTE-Sim will be the inputs of the WB E-model. The output of the WB E-model is user satisfaction via Mean Opinion Score (MOS). In addition, due to voice over LTE network (VoLTE) uses Adaptive Multi-Rate Wideband (AMR-WB) for vocoder while LTE-Sim supports only G.729 codec for narrow band, thus, we propose to add AMR-WB codec into LTE-Sim software. The simulation results show that the proposed model can predict voice quality in LTE network via the WB E-model. The proposed model does not refer to the original signal, thus, it is very suitable for predicting voice quality in LTE network for many different scenarios which are configured in the LTE-Sim framework. The proposed model is very suitable for predicting VoLTE quality for transmission planning, and for researchers in Laboratory.

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Objective Assessment Methodology for Estimating Conversational Quality in VoIP

Cited by 39 publications

References 6 publications

VoIP quality measurement: subjective VoIP quality estimation model for G.711 and G.729 based on native Thai users

VoIP quality measurement: subjective VoIP quality estimation model for G.711 and G.729 based on native Thai users

Accuracy analysis on call quality assessments in voice over IP

A New Non-intrusive Model for Measuring VoLTE Quality based on Wideband E-model

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