A Model For Service Switching Point For Dimensioning Of Intelligent Networks

Abstract

Dimensioning Intelligent Networks requires models by which the effects of the signaling network on the Grade of Service can be calculated. Clearly, the signaling between SSP and SCP causes some additional connection establishment delay. There is often signaling in the call termination phase. This signaling is important because of the traffic it generates and a delay it causes. Automatic call gapping, user impatience and time-outs can cause call abortion some of which is experienced by the caller as blocking. In this talk a simple phenomenological method is presented for obtaining end-to-end delays and some blocking probabilities. The method starts from message sequences and assigns work loads to transmitting or processing the messages. In Basically the whole signaling network is approximated by a single queue and a load dependent delay. There follows a discussion of what and how information of the signaling traffic characteristics and of the node architecture can be used in this simple model intended to give a formula for end-to-end delay to be used in the dimensioming process. Finally some scenarios which can degrade Grade of Service of an Intelligent Network are described as another aspect of performance modeling.