BINDING UPDATE METHOD, MOBILE TERMINAL, HOME AGENT, AND BINDING UPDATE SYSTEM

• US 20100091703A1
• Filed: 10/26/2007
• Published: 04/15/2010
• Est. Priority Date: 10/30/2006
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Morimoto, Tetsuro
• Granted Patent: US 8,254,311 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04W 60/005 Multiple registrations, e.g. multihoming
• CPC Class Codes: H04W 80/04 Network layer protocols, e.g. mobile IP [Internet Protocol]

Abstract

Disclosed in a technique for providing a binding update method and the like capable of resolving such a situation that a BA message keeps reciprocating between HAs. According to the technique, there is provided a binding update method, in which a mobile terminal transmits, to a home agent of the mobile terminal, a first message containing an address that is the destination to that the home agent forwards, and the home agent of the mobile terminal updates, based on the first message, a cache in which a home address of the mobile terminal is associated with an address that is the destination to that the home agent forwards, and transmits a second message as a reply to the first message to the mobile terminal, wherein when receiving the second message, the mobile terminal transmits, to the home agent of the mobile terminal, a third message notifying that the second message has been received, and after receiving the third message, the home agent of the mobile terminal updates the cache.

Claims

1. A binding update method, in which a mobile terminal transmits, to a home agent of the mobile terminal, a first message containing an address that is the destination to that the home agent forwards, and the home agent of the mobile terminal updates, based on the first message, a cache in which a home address of the mobile terminal is associated with an address that is the destination to that the home agent forwards, and transmits a second message as a reply to the first message to the mobile terminal, wherein

when receiving the second message, the mobile terminal transmits, to the home agent of the mobile terminal, a third message notifying that the second message has been received, and

after receiving the third message, the home agent of the mobile terminal updates the cache.

2. The binding update method according to claim 1, wherein the home agent of the mobile terminal sets, in the cache, a change-in-progress flag indicating that a received message is not forwarded during updating of the cache based on the first message, the home agent of the mobile terminal does not forward the received message while the change-in-progress flag is set.

3. The binding update method according to claim 1, wherein

the home agent of the mobile terminal adds identification information to the second message, and

the mobile terminal adds, to the third message, the identification information added to the second message.

4. A binding update method, in which a mobile terminal transmits, to a home agent of the mobile terminal, a first message containing an address that is the destination to that the home agent forwards, and the home agent of the mobile terminal updates, based on the first message, a cache in which a home address of the mobile terminal is associated with an address that is the destination to that the home agent forwards, and transmits a second message as a reply to the first message to the mobile terminal, wherein

the home agent of the mobile terminal sets, in the cache, a change-in-progress flag indicating that a received message is not forwarded during updating of the cache based on the first message, the home agent of the mobile terminal does not forward the received message while the change-in-progress flag is set.

5. A mobile terminal used in a binding update method, in which the mobile terminal transmits, to a home agent of the mobile terminal, a first message containing an address that is the destination to that the home agent forwards, and the home agent of the mobile terminal updates, based on the first message, a cache in which a home address of the mobile terminal is associated with an address that is the destination to that the home agent forwards, and transmits a second message as a reply to the first message to the mobile terminal, the mobile terminal comprising:

receiving means for receiving the second message;

message generating means for generating a third message notifying that the second message has been received when the receiving means has received the second message; and

transmission means for transmitting the generated third message to the home agent of the mobile terminal.

6. The mobile terminal according to claim 5, wherein when identification information is added to the second message, the message generating means adds, to the third message, the identification information added to the second message.

7. A home agent of a mobile terminal used in a binding update method, in which the mobile terminal transmits, to the home agent of the mobile terminal, a first message containing an address that is the destination to that the home agent forwards, and the home agent of the mobile terminal updates, based on the first message, a cache in which a home address of the mobile terminal is associated with an address that is the destination to that the home agent forwards, and transmits a second message as a reply to the first message to the mobile terminal, the home agent comprising:

message generating means for generating the second message;

transmission means for transmitting the generated second message to the mobile terminal;

receiving means for receiving, from the mobile terminal, a third message notifying that the second message has been received; and

update means for updating the cache when the third message has been received by the receiving means.

8. The home agent according to claim 7, wherein

the update means sets, in the cache, a change-in-progress flag indicating that a received message is not forwarded during updating of the cache based on the first message, and

the transmission means does not forward the message while the change-in-progress flag is set.

9. The home agent according to claim 7, wherein the message generating means adds identification information to the second message.

10. A home agent of a mobile used in a binding update method, in which the mobile terminal transmits, to the home agent of the mobile terminal, a first message containing an address that is the destination to that the home agent forwards, and the home agent of the mobile terminal updates, based on the first message, a cache in which a home address of the mobile terminal is associated with an address that is the destination to that the home agent forwards, and transmits a second message as a reply to the first message to the mobile terminal, the home agent comprising:

update means for setting, in the cache, a change-in-progress flag indicating that a received message is not forwarded during updating of the cache based on the first message; and

transmission means for not forwarding the received message while the change-in-progress flag is set.

11. A binding update system, in which a mobile terminal transmits, to a home agent of the mobile terminal, a first message containing an address that is the destination to that the home agent forwards, and the home agent of the mobile terminal updates, based on the first message, a cache in which a home address of the mobile terminal is associated with an address that is the destination to that the home agent forwards, and transmits a second message as a reply to the first message to the mobile terminal, wherein

when receiving the second message, the mobile terminal transmits, to the home agent of the mobile terminal, a third message notifying that the second message has been received, and

after receiving the third message, the home agent of the mobile terminal updates the cache.

12. The binding update system according to claim 11, wherein the home agent of the mobile terminal sets, in the cache, a change-in-progress flag indicating that a received message is not forwarded during updating of the cache based on the first message, the home agent of the mobile terminal does not forward the received message while the change-in-progress flag is set.

13. The binding update system according to claim 11, wherein

the home agent of the mobile terminal adds identification information to the second message, and

the mobile terminal adds, to the third message, the identification information added to the second message.

14. A binding update system, in which a mobile terminal transmits, to a home agent of the mobile terminal, a first message containing an address that is the destination to that the home agent forwards, and the home agent of the mobile terminal updates, based on the first message, a cache in which a home address of the mobile terminal is associated with an address that is the destination to that the home agent forwards, and transmits a second message as a reply to the first message to the mobile terminal, wherein

the home agent of the mobile terminal sets, in the cache, a change-in-progress flag indicating that a received message is not forwarded during updating of the cache based on the first message, the home agent of the mobile terminal does not forward the received message while the change-in-progress flag is set.