Mobile communication system and mobile communication method

A mobile communication method in a mobile communication system comprising a home agent which transfers a communication packet to a mobile communication device connected to a foreign network, the mobile communication method comprising the steps of:

• managing an address block by an address management section;
• assigning an IP address in the address block to the mobile communication device as a home address thereof;
• storing a home address in the home agent;
• storing a shared key in the mobile communication device, and storing the shared key and the home address and an identifier of the mobile communication device in a memory device in association with each other;
• transmitting a communication packet to the mobile communication device by a source node using the home address, the identifier, and the shared key stored in the memory device;
• transferring the communication packet from the source node by the home agent;
• and
• authenticating the source node based on the shared key stored in the mobile communication device by an authentication section of the mobile communication device, and starting communications with the source node.

A mobile communication system, comprising:

• a home agent which transfers a communication packet to a mobile communication device connected to a foreign network;
• an address management section which manages a plurality of IP addresses;
• an address generation section which assigns any of the IP addresses managed by the address management section to the mobile communication device as a home address thereof;
• a server which stores the home address of the mobile communication device and specific information of the mobile communication device in association with each other;
• and
• a source node which connects with the server through a network, and transmits the communication packet to any mobile communication device having the home addresses stored in the server as a destination.

A mobile communication method in a mobile communication system comprising a home agent which transfers a communication packet to a mobile communication device connected to a foreign network, the mobile communication method comprising the steps of:

• managing an address block by an address management section;
• assigning an IP address in the address block to the mobile communication device as a home address thereof;
• storing a home address in the home agent;
• storing a shared key in the mobile communication device, storing specific information including the home address of the mobile communication device in a server in association, and storing the shared key in a source node;
• transmitting a communication packet to the mobile communication device by the source node using the home address and the specific information key stored in the server and the shared key stored in the source node;
• transferring the communication packet from the source node by the home agent;
• and
• authenticating the source node based on the shared key stored in the mobile communication device by an authentication section of the mobile communication device, and starting communications with the source node.

A mobile communication system, comprising:

• a home agent which transfers a communication packet to a mobile communication device connected to a foreign network;
• an address management section which manages a plurality of IP addresses;
• an address generation section which assigns any of the IP addresses managed by the address management section to the mobile communication device as a home address thereof;
• an external storage device which stores device information of the mobile communication device;
• and
• a source node which transmits the communication packet to a mobile communication device having the home address included in the device information stored in the external storage device as a destination,
• wherein the source node comprises a device information generation section which obtains device information of a plurality of mobile communication devices, selects any device information to group the selected device information, and stores the grouped device information in the external storage device.