Simulation Study over IP Based GSM Backbone

This paper focuses on the questions of the evolution of mobile communication. Improving GSM networks is a key step in the development towards the 3rd generation of mobile communication systems. In the current article implementation possibilities of IP in the GSM (Global System for Mobile communication) backbone are investigated. Our goal is to justify the theory; applying absolute priority scheduler to transmit voice packets over IP (VoIP) assures better service, classifying packets according to their delay expectations. To achieve this goal simulations are applied to examine the effects of class numbers, classification and traffic control algorithms. Besides, we tried per-hop priority re-classification and a special early packet discard method. Keywords— Differentiated Services, Voice over IP, IP based GSM backbone