The rapidly changing technology involved in mobile communication systems makes this field both fascinating and
lively. There has been a drastic change in the functionality and appearance of the mobile hand-held devices relative to those
available a decade ago. Devices which were solely used for voice communications are now multi-functional and capable of
high speed data transmission. Infact, voice communication is treated as just one form of data by modern mobile devices. This
data communication forms a major source of revenue for network operators. With the emerging broadband wilreless
networks such as HSDPA, HSUPA and WiMAX; the goal of the network operator is to provide reasonable QoS for the price
paid by the customers for the subscribed service. The following section provides a brief overview of the evolution of
European mobile communication system.