Implementation of soft handover in 3G using OPNET

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 handoff (or 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. Handoff is a key concept to achieving mobility. Handoff 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 interruption is known as seamless connection. In this paper, implementation of softer handoff is done using OPNET MODELER.5 user equipment perform handoff which is present for “Hisar” of “Haryana” at “INDIA”. Parameter of UMTS handoff like active cell size, cell added to the set and cell removed from the set are checked.