Design and evaluation of novel VoIP link adaptation algorithm based on GTS function

This paper deals with design of novel VoIP link adaptation algorithm from the speech quality critical conditions point of view. The algorithm design is based on cross-layer optimization principle. In the case of this algorithm, the cross-layer optimization strategy uses an interaction of application layer and network layer methods, such as a method of improved speech quality critical conditions detection based on PESQ score (speech quality parameter) and GTS function, respectively. The primary goal of this algorithm is improving speech quality in the VoIP connections, which are established in the respective link. The assessment of speech quality is carried out by means of the accomplished PESQ algorithm. The GTS function is used for the purpose of transmission bit rate control (limitation). Our experiments show that this approach can lead to the improvement of speech quality in respective VoIP connections.