Patent ID: 8423021

Claim:
A location registration method of performing location registration processing on the basis of a location registration signal transmitted by a mobile station, the location registration method comprising the steps of: transmitting, at the mobile station, the location registration signal, when detecting that the mobile station has moved out of a location registration area with which the mobile station is already registered by location registration processing; and transferring, from a radio base station to an exchange identified by an exchange ID included in the location registration signal, the received location registration signal; wherein an exchange ID assigned to a first mobile station is different from an exchange ID assigned to a second mobile station, even though the same exchange is identified by the exchange IDs; a location registration area set for the first mobile station is different from a location registration area set for the second mobile station; a pool area controlled by one exchange is formed to include one or more entire location registration areas; a pool area set for the first mobile station is different from a pool area set for the second mobile station; and adjacent pool areas are overlapped with each other.