Patent ID: 7039413

Claim:
A mobile station transfer control system comprising a control apparatus for control over a plurality of cellular mobile communication systems and a mobile station present in a cell under the control of the control apparatus, and constructed in a configuration in which service areas of the respective cellular mobile communication systems regionally overlap each other at least in part, wherein said control apparatus comprises: notifying means for notifying said mobile station of cell information indicating whether the mobile station is transferable to a cell while maintaining a current cellular mobile communication system, about each of surrounding cells located around said present cell, and wherein said mobile station comprises: a cell information storage for storing the cell information about each surrounding cell notified of by said notifying means; detecting means for detecting the arrival of transfer timing from the present cell to a surrounding cell; transfer judging means for, when said detecting means detects the arrival of the transfer timing, judging whether said surrounding cell is a transferable cell to which the mobile station is transferable while maintaining the current cellular mobile communication system, based on the cell information stored in said cell information storage; and transfer control means for performing such control that when said surrounding cell is said transferable cell, the mobile station transfers to said surrounding cell and that when said surrounding cell is not said transferable cell, the mobile station transfers to a cell of a cellular mobile communication system different from the current cellular mobile communication system.