CDMA Systems Modelling Using OPNET Software Tool

Abstract

The paper presents the result of CDMA network modelling using OPNET software. Some results of our model investigation are also described here. Simulation result can be achieved using elaborated computer programs or commercial software tools. OPNET (Optimized Network Engineering Tool) is an example of such commercial software elaborated and delivered by MIL-3.

Elaborated model of CDMA system consists of mobile terminals, base stations, base controllers and managing centre. This four levels project contains several models including user mobility models (Gaussian, triangular), traffic models (Poisson), channel assignment models (hybrid model with channel relocation), handover models as well as microcellular network model (regular).

The user-defined parameters of these models can be introduced and changed. It gives a possibility of investigation of the call blocking probability versus number of channels, channels assignment method, mobile station mobility, priorities, traffic intensity as well as probability of mobile station in accessibility. Some results will be presented in this paper, including blocking probability versus total number of channels, number of fixed and dynamic channels and the area of the switching in proposed method.