On optimum timer value of area and timer-based location registration scheme

In typical mobile communication systems, mobile station (MS) location infor mation is updated when the MS crosses location area boundary or registratio n timer is expired. When a call attempt occurs, sequential paging rather th an blanket paging is used to reduce the paging cost. In this letter, we pro pose a new location update scheme in which to increase the paging accuracy, timer-based location update is performed within a location area. In this w ork, the optimum timer value of the area and timer-based location registrat ion scheme with intelligent paging is derived. In case of fixed location ar ea, the optimum registration timer value depends on speed and call arrival rate of MS. If the speed or call arrival rate of MS is high, location regis tration based on timer value should be performed frequently. Otherwise, loc ation registration based on the crossing of location area is sufficient.