Handover information sent over a public wide area network (e.g. internet)

• US 20090190550A1
• Filed: 07/28/2006
• Published: 07/30/2009
• Est. Priority Date: 08/01/2005
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Ubiquisys Limited (Cisco Systems, Inc.)
• Inventors: Giustina, Andrea, Byrne, Richard
• Granted Patent: US 8,639,248 B2
• Time in Patent Office: Days
• US Class Current: 370/331
• CPC Class Codes: H04L 12/5692 Selection among different networks
• CPC Class Codes: H04L 63/0471 applying encryption by an intermediary, e.g. receiving clear information at the intermediary and encrypting the received information at the intermediary before forwarding
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 60/00 Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
• CPC Class Codes: H04W 84/045 using private Base Stations, e.g. femto Base Stations, home Node B
• CPC Class Codes: H04W 84/22 with access to wired networks
• CPC Class Codes: H04W 88/08 Access point devices
• CPC Class Codes: H04W 88/10 adapted for operation in multiple networks, e.g. multi-mode access points
• CPC Class Codes: H04W 88/16 Gateway arrangements
• CPC Class Codes: H04W 92/02 Inter-networking arrangements
• CPC Class Codes: H04W 92/045 between access point and backbone network device
• CPC Class Codes: H04W 92/12 between access points and access point controllers

Abstract

A basestation (50) in a mobile communications network is connected to the core network of the mobile communications network over a public wide area network. In the event of a handover between the basestation and another of the network nodes of the PLMW (120), handover information (130, 132, 134) is sent between the basestation and the core network over the public wide area network, for example embedded in a SIP message or in a UMA message.

Claims

1. A mobile communications network, comprising:

a PLMN, comprising a plurality of network nodes;

a core network anchor node; and

an access point, serving as a basestation in the mobile communications network, and being able to establish a tunneling connection over a public wide area network to the core network anchor node, such that, in the event of a handover between the access point and another of the network nodes of the PLMN, handover information is sent between the access point and the other of the network nodes of the PLMN over the public wide area network.

2. A mobile communications network as claimed in claim 1, wherein, in the event of a handover from the other of the network nodes of the PLMN to the access point, the other of the network nodes of the PLMN is adapted to send handover information to the core network anchor node, and the core network anchor node is adapted to send handover information to the access point.

3. A mobile communications network as claimed in claim 2, wherein the core network anchor node is adapted to send the handover information to the access point over the public wide area network embedded in a SIP message.

4. A mobile communications network as claimed in claim 2, wherein the core network anchor node is adapted to send the handover information to the access point over the public wide area network embedded in a UMA message.

5. A mobile communications network as claimed in claim 2, wherein the access point has a USIM interface, with a tunneling connection to the core network anchor node while the access point is active, such that the core network anchor node is able to send handover information to the access point using said tunneling connection, without requiring a mobile device to perform a registration procedure with the access point before handover from the other of the network nodes of the PLMN to the access point.

6. A mobile communications network as claimed in claim 1, wherein, in the event of a handover from the access point to another of the network nodes of the PLMN, the core network anchor node is adapted to send handover information to the other of the network nodes of the PLMN, and thereafter is adapted to send a handover message to the access point.

7. A mobile communications network as claimed in claim 6, wherein the core network anchor node is adapted to send the handover message to the access point over the public wide area network embedded in a SIP message.

8. A mobile communications network as claimed in claim 7, wherein the core network anchor node is adapted to send the handover message to the access point over the public wide area network embedded in a UMA message.

9. A mobile communications network as claimed in claim 1, wherein, in the event of a handover from the access point to the other of the network nodes of the PLMN, the access point generates a new call to the PLMN to reach the UE now moved under PLMN coverage and reconnects the call to the other party.

10. A core network node for use in a mobile communications network, wherein the core network node comprises an IMS-MSC, the IMS-MSC being adapted to establish a tunneling connection over a public wide area network to an access point, serving as a basestation in the mobile communications network, such that, in the event of a handover between the access point and another of the network nodes of the PLMN, handover information is sent between the access point and the IMS-MSC over the public wide area network.

11. A core network node for use in a mobile communications network, wherein the core network node comprises a SIP-MSC, the SIP-MSC being adapted to establish a tunneling connection over a public wide area network to an access point, serving as a basestation in the mobile communications network, such that, in the event of a handover between the access point and another of the network nodes of the PLMN, handover information is sent between the access point and the SIP-MSC over the public wide area network.

19. A method as claimed in claim 11, wherein the access point retries to set-up the second call for a configurable set of retries over a period of time.

20. A method as claimed in claim 11, wherein the access point decides to attempt a handover in case the UE becomes unreachable to the access point during an active call.

21. A method as claimed in claim 11, wherein the access point stops the call attempts to the UE via the PLMN if the UE camps again on access point, generates a new call to the UE and reconnects the call to the other party.

22. A method as claimed in claim 11, wherein the access point plays announcements to the other connected party until the new call to UE is reconnected.

23. A method as claimed in claims 11, wherein the UE is provisioned with a USIM application that performs faster cell reselection of the macro network cell by searching only within a short list of cell IDs specified by the access point.

24. A method as claimed in claim 23, wherein the USIM application automatically answers to the call generated by the access point in order to speed up the reconnection of the call.

12. A core network node for use in a mobile communications network, wherein the core network node comprises a L-GANC, the L-GANC being adapted to establish a tunneling connection over a public wide area network to an access point, serving as a basestation in the mobile communications network, such that, in the event of a handover between the access point and another of the network nodes of the PLMN, handover information is sent between the access point and the L-GANC over the public wide area network.

13. A method of achieving a handover in mobile communications network, wherein the mobile communications network comprises a PLMN, having a plurality of network nodes, a core network anchor node, and an access point, serving as a basestation in the mobile communications network, wherein the basestation is connected over a public wide area network to the core network anchor node, the method comprising, in the event of a handover between the access point and another of the network nodes of the PLMN, sending handover information between the access point and the core network anchor node over the public wide area network.

14. A method as claimed in claim 13, comprising sending information between the access point and the core network anchor node over the public wide area network embedded in respective SIP messages.

15. A method as claimed in claim 13, comprising sending information between the access point and the core network anchor node over the public wide area network embedded in respective UMA messages.

16. A method as claimed in claim 13, wherein the core network anchor node comprises an IMS-MSC, the IMS-MSC being adapted to establish a tunneling connection over a public wide area network to an access point, serving as a basestation in the mobile communications network, such that, in the event of a handover between the access point and another of the network nodes of the PLMN, handover information is sent between the access point and the IMS-MSC over the public wide area network.

17. A method as claimed in claim 13, wherein the core network anchor node comprises a SIP-MSC, the SIP-MSC being adapted to establish a tunneling connection over a public wide area network to an access point, serving as a basestation in the mobile communications network, such that, in the event of a handover between the access point and another of the network nodes of the PLMN, handover information is sent between the access point and the SIP-MSC over the public wide area network.

18. A method as claimed in claim 13, wherein the core network anchor node comprises a L-GANC, the L-GANC being adapted to establish a tunneling connection over a public wide area network to an access point, serving as a basestation in the mobile communications network, such that, in the event of a handover between the access point and another of the network nodes of the PLMN, handover information is sent between the access point and the L-GANC over the public wide area network.