International Journal of Emerging Trends & Technology in Computer Science (IJETTCS)
Mobility is the main advantage of mobile cellular systems. Ability to communicate anywhere, at any time was the great success of wireless communications. Now-a-days, 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.