Patent ID: 8331944

Claim:
A mobile communication method, comprising: providing a plurality of first base stations and at least one second base station, wherein each of the first base stations can cover a smaller area than the second base station can; receiving a registration signal from a mobile communication device; when the registration signal is received through one of the first base stations, providing service to the mobile communication device through the first base station receiving the registration signal, and transmitting a first base station list, which comprises information of the first base stations, to the mobile communication device; making the mobile communication device measure signal strength of the first base stations according to the first base station list; making the mobile communication device transmit another registration signal to the first base station with the strongest measured signal strength; when the registration signal is received through the second base station, providing service through the second base station, and transmitting a second base station list, which comprises information of the first base stations and the second base station, to the mobile communication device; making the mobile communication device measure signal strength of the first base stations and the second base station according to the second base station list; making the mobile communication device transmit another registration signal to a base station with the strongest measured signal strength among the first base stations and the second base station; obtaining loadings of the first base stations; before transmitting the first base station list to the mobile communication device, determining if the loadings of the first base stations are all over loading threshold; and when the loadings of the first base stations are all over the loading threshold, making the mobile communication device transmit another registration signal to the second base station.