Execution of Soft Handover in UMTS Using OPNET Simulator

Mobility is the main advantage of mobile cellular systems. Ability to communicate anywhere, at any time was the great success of wireless communications in 90’s.  Now a day’s, continuous service is achieved by supporting handover from one cell to another. It is regularly initiate either by crossing a cell boundary or by deterioration in quality of the signal in the current channel. Handover is a key concept to achieving mobility. Handover stands for event which is start when user equipment moving to another base station and leave the previous base station. It makes possible for a user to travel from one cell to another, with no interrupt is known as seamless connection. In this paper, execution of soft handover is made using OPNET MODELER.4 user equipment perform handover which is present for a city in “INDIAâ€. Parameter of UMTS handover such as active cell size, cell added to the set and cell removed from the set, ATM throughput (bits/sec) are test out.