Abstract: In a mobile communications system in which dynamic IP addresses are assigned, a plurality of home agents are provided. A first home agent of the home agents includes a first holding section having a plurality of regional BCs each of which holds binding data and a plurality of transferred states. The first home agent further includes a selecting section for selecting a second home agent from the plural home agents and also selecting a regional BC for transfer from the plural regional BCs based on first load information and binding cache load information. The first home agent further includes a transmitter section for transmitting the regional BC for transfer toward the second home agent and also transmitting a registered destination change notification toward the mobile node. In addition, network reliability is enhanced while maintaining load dispersion and the performance of each home agent.

Abstract: A mobile radio telephone apparatus operating in a plurality of zones.

Abstract: A mobile radio telephone apparatus operating in a plurality of zones, where each user operates said apparatus from a mobile terminal in one of said zones. The apparatus comprises P number of mobile terminals in each zone, Q number of communications connecting devices in each zone, and a management connecting device in each zone for recognizing which zone a mobile terminal is located in. The mobile radio telephone apparatus also comprises a controlling unit for controlling the management connecting device so that it operates as an additional communications connecting device in one zone, if one of the P mobile terminals generates a connecting request in the one zone and all Q of the communications connecting devices are already assigned to the other P mobile terminals.