Optimal time-interval for time-based location update in mobile communications

We analyze a time-based update method in location management and calculate the optimal time-interval. We obtain the probability that an NIT is j rings away from the center cell. And using these values, an exact analysis is made for the time-based location management cost. From the result, when the time-based method is applied to location update, we can get the optimal time-interval which minimizes the location management cost.