AVOIDING FORMATION OF A CALL LOOP RESULTING FROM HANDLING OF A MOBILE TERMINATED CALL IN PARALLEL WITH A LOCATION UPDATE IN A WIRELESS COMMUNICATION NETWORK

• US 20150045039A1
• Filed: 10/10/2014
• Published: 02/12/2015
• Est. Priority Date: 05/02/2013
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Inventors: Tian, Lu, Landais, Bruno
• Granted Patent: US 9,462,458 B2
• Time in Patent Office: Days
• US Class Current: 455/440
• CPC Class Codes: H04M 1/724 User interfaces specially adapted for cordless or mobile telephones
• CPC Class Codes: H04M 2207/187 combining circuit and packet-switched, e.g. GPRS
• CPC Class Codes: H04M 3/545 with loop avoiding arrangements
• CPC Class Codes: H04W 36/0022 for transferring data sessions between adjacent core network technologies
• CPC Class Codes: H04W 76/30 Connection release
• CPC Class Codes: H04W 8/06 Registration at serving network Location Register, VLR or user mobility server
• CPC Class Codes: H04W 8/12 between location registers or mobility servers
• CPC Class Codes: H04W 8/245 from a network towards a terminal
• CPC Class Codes: H04W 88/16 Gateway arrangements

Abstract

A call loop avoidance capability is provided for preventing formation of a call loop resulting from handling of a mobile terminated (MT) call in parallel with a location update for a mobile device (MD) in a wireless communication network. The call loop avoidance capability prevents formation of a call loop between an old mobility and call management entity (MCME) and a new MCME when delivery of an MT call to an MD is performed while the MD is in the process of moving from the old MCME to the new MCME using a location update procedure. An enhanced call routing procedure supports direct delivery of the MT call from the new MCME to the MD (rather than delivery of the MT call by the new MCME to the MD via the old MCME) in order to prevent formation of a call loop between the old MCME and the new MCME.

Claims

1. A method for preventing a call loop for a mobile terminated (MT) call to a mobile device (MD), the method comprising:

using a processor and a memory for;

receiving, at a first mobility and call management entity (MCME) from a second MCME, a routing information request message associated with delivery of the MT call to the MD, the routing information request message comprising an indication of a gateway MCME for the MD; and

determining whether the gateway MCME for the MD that is indicated in the routing information request message identifies the first MCME.

2. The method of claim 1, wherein the routing information request message comprises a Mobile Application Part (MAP) Provide Roaming Number (PRN) message.

3. The method of claim 1, wherein the indication of the gateway MCME for the MD comprises a gateway MCME address of the gateway MCME for the MD, wherein the first MCME has an MCME address associated therewith, wherein determining whether the gateway MCME for the MD that is indicated in the routing information request message identifies the first MCME comprises:

comparing the gateway MCME address of the gateway MCME for the MD and the MCME address associated with the first MCME.

4. The method of claim 1, further comprising:

based on a determination that the gateway MCME for the MD in the routing information request message identifies the first MCME;

initiating delivery of the MT call directly from the first MCME to the MD.

5. The method of claim 1, further comprising:

based on a determination that the gateway MCME for the MD in the routing information request message identifies the first MCME;

propagating, from the first MCME toward the second MCME, a release message configured to instruct the second MCME to release resources of the second MCME for the MD.

6. The method of claim 5, further comprising:

receiving, at the first MCME from the second MCME, a release complete message.

7. The method of claim 1, wherein the first MCME comprises a first Mobile Switching Center (MSC)/Visiting Location Register (VLR) element and the second MCME comprises a second MSC/VLR element.

8. A mobility and call management entity (MCME) configured for preventing a call loop for a mobile terminated (MT) call to a mobile device (MD), the MCME comprising:

a processor and a memory communicatively connected to the processor, the processor configured to;

receive, at the MCME from a second MCME, a routing information request message associated with delivery of the MT call to the MD, the routing information request message comprising an indication of a gateway MCME for the MD; and

determine whether the gateway MCME for the MD that is indicated in the routing information request message identifies the MCME.

9. The MCME of claim 8, wherein the routing information request message comprises a Mobile Application Part (MAP) Provide Roaming Number (PRN) message.

10. The MCME of claim 8, wherein the indication of the gateway MCME for the MD comprises a gateway MCME address of the gateway MCME for the MD, wherein the MCME has an MCME address associated therewith, wherein, to determine whether the gateway MCME for the MD that is indicated in the routing information request message identifies the MCME, the processor is configured to:

compare the gateway MCME address of the gateway MCME for the MD and the MCME address associated with the MCME.

11. The MCME of claim 8, wherein the processor is configured to:

based on a determination that the gateway MCME for the MD in the routing information request message identifies the MCME;

initiate delivery of the MT call directly from the MCME to the MD.

12. The MCME of claim 8, wherein the processor is configured to:

based on a determination that the gateway MCME for the MD in the routing information request message identifies the MCME;

propagate, from the MCME toward the second MCME, a release message configured to instruct the second MCME to release resources of the second MCME for the MD.

13. The MCME of claim 12, wherein the processor is configured to:

receive, at the MCME from the second MCME, a release complete message.

14. The MCME of claim 8, wherein the MCME comprises a first Mobile Switching Center (MSC)/Visiting Location Register (VLR) element and the second MCME comprises a second MSC/VLR element.

15. A method, comprising:

using a processor and a memory for;

propagating, from a first mobility and call management entity (MCME) toward a second MCME, a routing information request message associated with delivery of a mobile terminated (MT) call to a mobile device (MD), the routing information request message comprising an indication of a gateway MCME for the MD; and

receiving, at the first MCME from the second MCME, a release message configured to instruct the first MCME to release resources of the first MCME for the MD.

16. The method of claim 15, further comprising:

prior to propagating the routing information request message;

receiving, from a home location register, a message comprising an indication of the gateway MCME for the MD.

17. The method of claim 15, further comprising:

propagating, from the first MCME toward the second MCME, a release complete message indicative that the first MCME has released resources of the first MCME for the MD.

18. A mobility and call management entity (MCME), the MCME comprising:

a processor and a memory communicatively connected to the processor, the processor configured to;

propagate, from the MCME toward a second MCME, a routing information request message associated with delivery of a mobile terminated (MT) call to a mobile device (MD), the routing information request message comprising an indication of a gateway MCME for the MD; and

receive, at the MCME from the second MCME, a release message configured to instruct the MCME to release resources of the MCME for the MD.

19. The MCME of claim 18, wherein the processor is configured to:

prior to propagating the routing information request message;

receive, from a home location register, a message comprising an indication of the gateway MCME for the MD.

20. The MCME of claim 18, wherein the processor is configured to:

propagate, from the MCME toward the second MCME, a release complete message indicative that the MCME has released resources of the MCME for the MD.