Patent ID: 8335520

Claim:
A mobile phone comprising: a location update processing unit for generating a control signal when identifying that the mobile phone frequently performs location updates in a predetermined time; a location area judging unit for judging whether the mobile phone frequently moves back and forth near a boundary of an overlapping area of two adjacent cells of the boundary area of two adjacent location areas in response to the control signal; a scope acquiring unit for acquiring a predetermined scope when the mobile phone frequently moves back and forth near the boundary of the overlapping area, wherein the predetermined scope is a circle, the center of the circle is on the boundary of the overlapping area, and the radius of the circle is equal to one half of a distance between the center of one cell and the center of the other adjacent cell subtracted from the sum of the radius of the cell and the radius of the other cell; a scope judging unit for judging whether the mobile phone moves out the predetermined scope when the mobile phone frequently moves back and forth near the boundary of the overlapping area; and a selecting unit for controlling the mobile phone to perform a location update when the mobile phone moves out the predetermined scope; wherein when the mobile phone does not move out the predetermined scope, the mobile phone does not perform a location update.