Abstract: In a mobile communication system which comprises a mobile station (1), a radio network (2) for radio transmission and reception to and from the mobile station, a home location register (HLR) (4) for managing, through a mobile services-switching center (3), current location information representative of a current location of the mobile station in a public telephone network, and a home agent (HA) (7) for managing, through a packet gateway (6), current location information representative of a current location of the mobile station in a packet data communication network, the home location register and the home agent are connected to each other through a communication channel (15) for transmission of update contents for the current location information managed by the home location register and the home agent.

Abstract: In a mobile communication system which comprises a mobile station (1), a radio network (2) for radio transmission and reception to and from the mobile station, a home location register (HLR) (4) for managing, through a mobile services-switching center (3), current location information representative of a current location of the mobile station in a public telephone network, and a home agent (HA) (7) for managing, through a packet gateway (6), current location information representative of a current location of the mobile station in a packet data communication network, the home location register and the home agent are connected to each other through a communication channel (15) for transmission of update contents for the current location information managed by the home location register and the home agent.

Abstract: The object of the present invention is to minimize the value of transmitted electric power in the reverse channel of a mobile radio station when a plurality of radio communication lines are connected for a relatively long period of time as upon no-break soft hand-over. The system for controlling the electric power transmitted in a reverse channel of the present invention is a mobile communication system for reducing the value of transmitted electric power of a mobile radio station being connected when communication quality of a signal received from the mobile radio station exceeds a range of permitted values. The system includes a base station control station which controls base radio stations. The base station control station has an error rate measuring circuit for selectively combined signals in reverse channels transmitted from the mobile radio station through all the connected communication lines and a reverse channel transmitted electric power correction control circuit.