Mobile node, mobile agent and network system

A mobile apparatus for performing communications with another apparatus connected to a network by using a first type internet protocol and a second type internet protocol, comprising:

• a communication portion for transmitting/receiving a packet to/from the network, the packet being compliant with the first type internet protocol or the second type internet protocol;
• a movement detection processing portion that, when the mobile apparatus is moved from a first network to a second network, executes judgment as to whether the second network is a network in which communications are performed by using at least the first type internet protocol or a network in which communications are performed by using the second type internet protocol;
• and
• a packet transmission portion that, when a first packet compliant with the first type internet protocol is to be transmitted to another apparatus connected to a network, creates, if the movement detection processing portion executes judgment that the second network is a network in which communications are performed by using the second type internet protocol, a second packet by adding a header to the first packet, and transmits the second packet via the communication portion, the header including, as a destination address, a first address compliant with the second type internet protocol of a mobile agent connected to the first network, for assisting movement of the mobile apparatus and, as a source address, a second address compliant with the second type internet protocol acquired in the second network by the mobile apparatus.

A mobile apparatus including a communication portion for transmitting/receiving a packet to/from a network, the packet being compliant with a first type internet protocol or a second type internet protocol, the mobile apparatus for performing communications with another apparatus connected to a network by using the first type internet protocol and the second type internet protocol, comprising:

• a movement state storing portion that, when the mobile apparatus is moved from a first network to a second network, stores a network address of the second network as an after-movement network address;
• and
• a packet transmission portion that, when a first packet compliant with the first type internet protocol is to be transmitted to another apparatus connected to a network, judges whether the second network is a network in which communications are performed by using at least the first type internet protocol or a network in which communications are performed by using the second type internet protocol based on contents of the after-movement network address stored in the movement state storing portion, and, if the second network is a network in which communications are performed by using the second type internet protocol, creates a second packet by encapsulating the first packet with a packet compliant with the second type internet protocol to transmit the second packet via the communication portion.

A mobile apparatus including a communication portion for transmitting/receiving a packet to/from a network, the packet being compliant with a first type internet protocol or a second type internet protocol, the mobile apparatus for performing communications with another apparatus connected to a network by using the first type internet protocol and the second type internet protocol, comprising:

• a movement state storing portion that, when the mobile apparatus is moved from a first network to a second network, stores a network address of the second network as an after-movement network address;
• a creation portion that creates a first packet compliant with the first type internet protocol to be sent to another apparatus connected to a network;
• and
• a packet transmission portion that judges, from the after-movement network address stored in the movement state storing portion, whether the second network is a network in which communications are performed by using at least the first type internet protocol or a network in which communications are performed by using the second type internet protocol;
• creates, if the second network is a network in which communications are performed by using the second type internet protocol, a second packet by adding a header to the first packet, the header including, as a destination address, a first address compliant with the second type internet protocol of a mobile agent connected to the first network, for assisting movement of the mobile apparatus and, as a source address, a second address compliant with the second type internet protocol acquired in the second network by the mobile apparatus;
• and transmits the second packet via the communication portion.

A mobile apparatus including a communication portion for transmitting/receiving a message to/from a network, a first processing portion for performing a process compliant with a first type internet protocol, and a second processing portion for performing a process compliant with a second type internet protocol, the mobile apparatus performing communications with another apparatus connected to a network by using the first type internet protocol and the second type internet protocol, comprising:

• a movement detection portion that, when the mobile apparatus is moved from a first network in which communications are performed by using at least the first type internet protocol to a second network in which communications are performed by using the second type internet protocol, receives a first message compliant with the second type internet protocol via the communication portion from a first mobile agent connected to the second network, and detects, based on information contained in the first message, that the mobile apparatus has moved from the first network to the second network;
• and
• a movement registration portion that acquires a first IP address compliant with the second type internet protocol and to be used in the second network, creates a second message compliant with the first type internet protocol, the second message requesting a second mobile agent connected to the first network to register the first IP address, creates a third message by encapsulating the second message with a message compliant with the second type internet protocol, and transmits the third message via the communication portion.

A mobile apparatus including a communication portion for transmitting/receiving a message to/from a network, a first processing portion for performing a process compliant with a first type internet protocol, and a second processing portion for performing a process compliant with a second type internet protocol, the mobile apparatus for performing communications with another apparatus connected to a network by using the first type internet protocol and the second type internet protocol, comprising:

• a movement detection portion that, when the mobile apparatus is moved to a second network from a first network in which communications are performed by using at least the first type internet protocol, receives a first message from a first mobile agent connected to the second network, and detects, based on information contained in the first message, that the mobile apparatus has moved from the first network to the second network;
• and
• a movement registration portion that acquires a first IP address to be used in the second network, creates a second message compliant with the first type internet protocol, the second message requesting a second mobile agent connected to the first network to register the IP address, creates, if the second network is a network in which communications are performed by using the second type internet protocol, a third message by encapsulating the second message with a message compliant with the second type internet protocol, and transmits the third message via the communication portion.