Patent ID: 8229429

Claim:
A location registration method for a mobile station in a mobile communication system, wherein a radio control station manages a cell identifier, a first location number and a second location number in association with each other, the first location number being used by the mobile station to identify a location of a cell within a location area, the location area being configured to include one or more cells and the first location number is unique only within the location area, the second location number being used by the radio control station to identify the location area, the second location number being unique to an entire mobile communication system, and an exchange manages a user identifier, the first location number, the second location number, and a radio control station identifier in association with each other, the method comprising the steps of: causing the radio control station to extract the first location number by using the cell identifier as key information, and to transmit notification information containing the extracted first location number to a cell identified by the cell identifier; causing the mobile station to transmit a location registration request when the first location number contained in the notification information is different from a location number stored in the mobile station, wherein the mobile station continues to operate in a standby mode when the first location number contained in the notification information matches the location number stored in the mobile station; upon the radio control station receiving the location registration request, causing the radio control station to extract the first location number and the second location number by using, as key information, the cell identifier which identifies the cell being that is an originator of the location registration request, and to notify the exchange of the extracted first location number, the extracted second location number, and the user identifier identifying the mobile station; causing the exchange to perform location registration processing for the mobile station by storing the notified user identifier, the notified first location number and the notified second location number in association with each other; upon an incoming call signal, which contains the user identifier, being received at the exchange, causing the exchange to extract the second location number by using the user identifier contained in the incoming call signal as key information, to extract the radio control station identifier by using the extracted second location number as key information, and to notify the radio control station identified by the extracted radio control station identifier of the user identifier and the second location number; and causing the radio control station to extract the cell identifier by using the notified second location number as key information, and to transmit a paging signal containing the notified user identifier to the cell identified by the extracted cell identifier.