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A novel method for the codecs’ performance analysis in mobile telephony systems

This paper presents a novel method of expressing the quality of service in a
 mobile telecommunication system when its performance depends on several
 factors including applied codecs? characteristics (voice quality and data
 flow rate) and telecommunications traffic service possibilities. The
 influence of these factors is unified in one variable - quality of service
 measure. The proposed method is especially applicable in the cases when
 two-dimensional systems are analyzed - for example when two codecs with
 different flow rate and different achievable connection quality are used in
 a system. As an example, we also studied system with full-rate or mixed
 full-rate and half-rate codec implementation depending on the offered
 traffic. The system performances - mean dataflow and mean connection quality
 as a function of offered traffic are presented graphically and also
 expressed quantitatively by the novel quality of service measure. The
 systems with different number of available traffic channels may be compared
 on the base of this novel evaluation value such that the system with the
 highest value is the most suitable one for the concrete situation. In this
 way mobile system design is simplified to the great extent. The developed
 model is applicable generally for mobile telephony systems defining, but in
 this paper we studied its implementation for Global System for Mobile
 communications.