Patent ID: 7016677

Claim:
A switching station comprising: means for receiving a location registration signal from a mobile station; and means for deleting, when the location registration signal is recieved, one of pieces of subscriber service information presently registered in a first management unit provided for use with the switching station and managing subscriber information, and for registering subscriber service information of the mobile station that has transmitted the location registration signal in the first management unit provided for use with the switching station, in a case where no subscriber service information can be newly registered in the first management unit provided for use with the switching station, wherein the switching station further comprises means for registering subscriber location information about a mobile station in a second management unit managing subscriber information, and wherein when the switching station deletes one of the pieces of subscriber service information presently registered in the first management unit for use with the switching station, the switching station does not delete, from the first management unit for use with the switching station, subscriber location information about a mobile station corresponding to the subscriber service information to be deleted, and wherein when the switching station receives the location registration signal from the mobile station, the switching station registers in the second management unit the subscriber location information about the mobile station registered in the first management unit for use with the switching station.