An Empirical Study on the Quality Assessment of the VoIP Service over Wireless Mobile Networks
This paper discusses the service quality of packet-based voice service provided over wireless mobile networks such as wireless broadband (WiBro) and high speed downlink packet access (HSDPA) systems. Using measurement software, a large scale of experiment
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Abstract. This paper discusses the service quality of packet-based voice service provided over wireless mobile networks such as wireless broadband (WiBro) and high speed downlink packet access (HSDPA) systems. Using measurement software, a large scale of experiment has been conducted to measure the actual quality of the voice service over both wireless mobile networks. Based on the results from the experiment, the quality of the voice service is supposed to be quite good. Through further experiment, the quality degradation over a radio channel leads to the increase in delay and the subsequent quality degradation of the voice service. Keywords: mobile VoIP service, voice quality measurement software, E-Model, mean opinion score (MOS).
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Introduction
The packet-based voice service such as voice over IP (VoIP) service over a wired network [1] has become popular now because of its low cost. In providing the voice service over a wireless mobile network, however, one of the challenges that should be addressed is how to support and guarantee its service quality [2], [3]. Not only the bandwidth provided by a wireless channel is small, several characteristics should be considered; e.g., the time-varying channel qualities over a wireless channel, mobility-related processes like handoff, and etc. For the past few years, we have studied to find the answers for the following two questions: • What is the current service quality of voice service over wireless mobile networks? • What level of radio channel quality provokes the degradation of the service quality of the voice service over wireless mobile networks? And the answers are presented in the remainder of this paper.
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Correspoding author.
James J. (Jong Hyuk) Park et al. (eds.), Multimedia and Ubiquitous Engineering, Lecture Notes in Electrical Engineering 308, DOI: 10.1007/978-3-642-54900-7_22, © Springer-Verlag Berlin Heidelberg 2014
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K.-Y. Yoon and B. Kim
The Quality Measurement Software
In order to measure the voice quality in this study, we use the software developed in our previous research [4]. Fig. 1-(a) shows the logical architecture of the software running on the user equipment’s side.
Fig. 1. The voice quality measurement software
The software consists of the measurement function, the reporting function, and the user interface. It supports the access to two wireless mobile networks that are available now; one is wireless broadband (WiBro) that is based on IEEE 802.16 standard and well-known as WiMAX and the other one is high speed downlink packet access (HSDPA) that is a 3G mobile system. Table 1. The selected service quality metrics
RF quality metrics Network quality metrics VoIP quality metrics
Quality metrics WiBro HSDPA RSSI (received signal strength indicator) CINR (carrier to Ec/Io (energy per chip over the interference noise ratio) interference noise) Bandwidth, one-way delay, jitter, packet loss rate R-Score, MOS (mean opinion score)
Considering the communication architecture in which voice packets are delivered, the measurement
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