GPRS is part of the evolution path towards

3G. This paper investigates the effect of user mobility on packet transmission in GPRS. A simulator was developed to study the end-to-end behaviour of data transmission between a mobile client and a fKed server via GPRS and Internet. Simulation results show interruption in data delivery when MS executes a routing area update procedure. A fair queuing algorithm is proposed to minimise update delay and packet loss.