Enhanced fast handover procedures

• US 7,917,152 B2
• Filed: 02/12/2004
• Issued: 03/29/2011
• Est. Priority Date: 06/27/2003
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Corporation
• Inventors: Grech, Sandro, Alarcon, Leopoldo
• Primary Examiner(s): Ly, Nghi H
• Assistant Examiner(s): Gonzalez, Amancio
• Application Number:
  US10/776,502
• Publication Number:
  US 20040264476A1
• Time in Patent Office: 2,602 Days
• Field of Search: 370/328, 370/401, 370/331, 370/353, 455/432, 455/436, 455438-444, 380/247, 340/5.8, 340/2.23, 709/132, 709/229
• US Class Current: 455/456.1
• CPC Class Codes: H04W 36/0011 for data sessions of end-to-end connection
• CPC Class Codes: H04W 36/0016 Hand-off preparation specially adapted for end-to-end data sessions
• CPC Class Codes: H04W 36/14 Reselecting a network or an air interface
• CPC Class Codes: H04W 40/36 due to handover
• CPC Class Codes: H04W 8/087 for preserving data network PoA address despite hand-offs
• CPC Class Codes: H04W 80/04 Network layer protocols, e.g. mobile IP [Internet Protocol]

Abstract

A method for performing a change of a connection of a mobile entity from a first network access entity to a second network access entity, wherein a global address of the first network access entity is not known to the mobile entity is provided. According to one embodiment, the method includes the step of sending a message including information for identifying the first network access entity from the mobile entity to the second network access entity which enables the second network entity to direct traffic to the first network entity. According to another embodiment, the invention also provides a method for the reverse direction. Namely, the invention provides a method for sending IP signaling from the mobile entity or from the first network access entity towards the second network access entity, whose global IP address is not known by the mobile entity or first network access entity.

Claims

1. A method, comprising:

sending, from a mobile entity to a second network access entity, a message comprising a fast binding update message, the message including information for identifying a first network access entity comprising a gateway general packet radio service support node, wherein the information identifying the first network access entity enables the second network access entity to determine a global address for the first network access entity, wherein the global address of the first network access entity is not known to the mobile entity due to a move by the mobile entity from a previous network to a target network of the second network access entity, wherein the information comprises a link local address associated with the first network access entity, a network identity associated with the previous network of the first network access entity, an access point name associated with an access point through which the mobile entity was connected to the first network access entity, and a link layer address of the mobile entity; and

handing over a connection of the mobile entity from the first network access entity to the second network access entity,

wherein the message is configured to enable the second network access entity to direct traffic to the first network access entity based on the information included in the message, wherein the information is mapped, at the second network access entity, to the global address of the first network access entity.

2. The method according to claim 1, further comprising:

identifying, in the second network access entity, whether the message received from the mobile entity is directed to the first network access entity by checking an address indicated in the message, and checking whether the address is globally routable.

3. The method according to claim 2, wherein the identifying comprises checking the address to determine whether the address is globally routable or not based on a prefix of the address.

4. The method according to claim 1, wherein the sending comprises sending the message before de-establishing a connection between the mobile entity and the first network access entity.

5. The method according to claim 1, wherein the sending comprises sending the message after de-establishing the connection between the mobile entity and the first network access entity.

6. The method according to claim 1, further comprising:

receiving at the second network access entity a message from the first network access entity including the global address of the first network access entity.

7. The method according to claim 1, further comprising:

providing in the second network access entity a mapping table in which the information for identifying the first network access entity received from the mobile entity is mapped to a global address of the first network access entity.

8. The method according to claim 1, further comprising:

sending a message including all or part of the information for identifying the first network access entity to a proxy; and

determining, using the proxy, an address of the first network access entity.

9. The method according to claim 8, further comprising:

forwarding, using the proxy, traffic between the second network access entity and the first network access entity.

10. The method according to claim 1, further comprising:

monitoring, using the mobile entity, attributes of a network of the first network access entity in order to obtain the information for identifying the first network access entity.

11. The method according to claim 8, further comprising:

determining, using the second network access entity, an address of the proxy based on the information for identifying the first network access entity received from the mobile entity.

12. A method, comprising:

forming a message for handing over a connection of a mobile entity from a first network access entity to a second network access entity, wherein the message comprises a fast binding update message including information for identifying the first network access entity comprising a gateway general packet radio service support node, wherein the information identifying the first network access entity enables the second network access entity to determine a global address for the first network access entity, wherein the global address of the first network access entity is not known to the mobile entity due to a move by the mobile entity from a previous network to a target network of the second network access entity, wherein the information comprises a link local address associated with the first network access entity, a network identity associated with the previous network of the first network access entity, an access point name associated with an access point through which the mobile entity was connected to the first network access entity, and a link layer address of the mobile entity; and

sending, from the mobile entity to the second network access entity, the message including the information, wherein the message enables the first network access entity to direct traffic to the second network access entity.

13. The method according to claim 12, further comprising:

sending, a message including all or part of the information for identifying the second network access entity to a proxy; and

determining, using the proxy, an address of the second network access entity.

14. The method according to claim 13, further comprising:

forwarding, using the proxy, traffic between the first network access entity and the second network access entity.

15. The method according to claim 12, further comprising:

monitoring, using the mobile entity, attributes of a network of the second network access entity in order to obtain the information for identifying the second network access entity.

16. The method according to claim 13, further comprising:

determining, using the first network access entity, the address of the proxy based on the information for identifying the second network access entity received from the mobile entity.

17. The method according to claim 12, further comprising:

identifying, in the first network access entity, whether the message received from the mobile entity is directed to the second network access entity by checking an address indicated in the message, and checking whether the address is globally routable.

18. The method according to claim 17, wherein the identifying comprises checking the address to determine whether the address is globally routable or not based on a prefix of the address.

19. The method according to claim 12, wherein the sending comprises sending the message comprising a handover initiate message.

20. The method according to claim 12, wherein

providing in the first network access entity a mapping table in which the information for identifying the second network access entity received from the mobile entity is mapped to a global address of the second network access entity.

21. The method according to claim 12, wherein the sending comprises sending the information for identifying the second network access entity comprising at least one parameter selected from at least one parameter as follows:

a target network identity,

a target access point name, and

an identity associated with an access point through which the mobile entity connects to the second network access entity.

22. An apparatus, comprising:

a processor, wherein the processor is configured to process data related to sending, from a mobile entity to a second network access entity, a message comprising a fast binding update message, the message including information for identifying a first network access entity comprising a gateway general packet radio service support node, wherein the information identifying the first network access entity enables the second network access entity to determine a global address for the first network access entity, wherein the global address of the first network access entity is not known to the mobile entity due to a move by the mobile entity from a previous network to a target network of the second network access entity, wherein the information comprises a link local address associated with the first network access entity, a network identity associated with the previous network of the first network access entity, an access point name associated with an access point through which the mobile entity was connected to the first network access entity, and a link layer address of the mobile entity.

23. The apparatus according to claim 22, wherein the message is a fast binding update message.

24. The apparatus according to claim 22, wherein the information to identify the first network access entity comprises at least one of the following parameters:

old network identity associated with the first network access entity,

old access point name,

identity associated with the access point through which the apparatus was connected to the first network access entity, and/or

a link layer address of the apparatus.

25. The apparatus according to claim 22, wherein the processor is further configured to monitor attributes of the network of the second network access entity in order to obtain information to identify the second network access entity.

26. An apparatus, comprising:

a processor configured to process data related a message comprising a fast binding update message, the message including information for identifying a first network access entity comprising a gateway general packet radio service support node, wherein the information identifying the first network access entity enables the second network access entity to determine a global address for the first network access entity, wherein the global address of the first network access entity is not known to the mobile entity due to a move by the mobile entity from a previous network to a target network of the second network access entity, wherein the information comprises a link local address associated with the first network access entity, a network identity associated with the previous network of the first network access entity, an access point name associated with an access point through which the mobile entity was connected to the first network access entity, and a link layer address of the mobile entity.

27. The apparatus according to claim 26, wherein the processor is configured to monitor attributes of the network of the second network access entity in order to obtain information to identify the second network access entity.

28. The apparatus according to claim 26, wherein the message is a handover initiate message.

29. The apparatus according to claim 26, wherein the information to identify the second network access entity comprises at least one of the following parameters:

a target network identity,

target access point name, or

identity associated with the access point through which the apparatus will be connected to the second network access entity.

30. A computer program product embodied on a non-transitory computer readable medium, the computer program product being configured to control a processor to perform a method comprising:

forming a message which enables a first network entity to direct traffic destined to a second network entity when a connection is handed over from the first network access entity to the second network access entity, wherein the message comprises a fast binding update message including information for identifying the first network access entity comprising a gateway general packet radio service support node, wherein the information identifying the first network access entity enables the second network access entity to determine a global address for the first network access entity, wherein the global address of the first network access entity is not known to the mobile entity due to a move by the mobile entity from a previous network to a target network of the second network access entity, wherein the information comprises a link local address associated with the first network access entity, a network identity associated with the previous network of the first network access entity, an access point name associated with an access point through which the mobile entity was connected to the first network access entity, and a link layer address of the mobile entity; and

sending, from the mobile entity to the second network access entity, the message including the information.

31. An apparatus, comprising:

a processor, wherein the processor is configured to;

process a received message from a mobile entity, the message comprising a fast binding update message including information for identifying the first network access entity comprising a gateway general packet radio service support node, wherein the information identifying the first network access entity enables the second network access entity to determine a global address for the first network access entity, wherein the global address of the first network access entity is not known to the mobile entity due to a move by the mobile entity from a previous network to a target network of the second network access entity, wherein the information comprises a link local address associated with the first network access entity, a network identity associated with the previous network of the first network access entity, an access point name associated with an access point through which the mobile entity was connected to the first network access entity, and a link layer address of the mobile entity; and

use said message to direct traffic to the second network access entity.