CIRCUIT SWITCHED FALL BACK REDIRECTION ACROSS MOBILE SWITCHING CENTER POOLS

• US 20160057682A1
• Filed: 08/21/2014
• Published: 02/25/2016
• Est. Priority Date: 08/21/2014
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: YANG, Ming, CHIN, Tom
• Granted Patent: US 9,456,399 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04W 36/0016 Hand-off preparation specially adapted for end-to-end data sessions
• CPC Class Codes: H04W 36/0022 for transferring data sessions between adjacent core network technologies
• CPC Class Codes: H04W 36/0066 of control information between different types of networks in order to establish a new radio link in the target network
• CPC Class Codes: H04W 36/24 Reselection being triggered by specific parameters
• CPC Class Codes: H04W 36/32 by location or mobility data, e.g. speed data
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

A user equipment (UE) receives a circuit switched page from a first radio access technology (RAT) and a command instructing the UE to redirect to a second RAT. The command indicates a designated location area identity of the second RAT. The UE detects base stations of the second RAT and determines whether a strongest base station is in an area identified by the designated location area identity. The UE connects to the strongest base station based on the determining. When the designated location area identity is a permitted location area, the UE connects to the strongest base station when the location of the strongest base station is included in the permitted location area. When the designated location area identity is a prohibited location area, the UE connects to the strongest base station when the location of the strongest base station is not included in the prohibited location area.

Claims

1. A method of wireless communication comprising:

receiving circuit switched (CS) paging from a first radio access technology (RAT);

receiving a command from the first RAT to redirect to a second RAT, the command including an indication of at least one designated location area identity of at least one base station of a plurality of base stations of the second RAT;

detecting the plurality of base stations of the second RAT;

determining whether a location area of a first strongest base station of the plurality of base stations is included in the at least one designated location area identity; and

connecting to the first strongest base station based on the determining.

2. The method of claim 1, in which the at least one designated location area identity comprises a permitted location area, and in which the method further comprises connecting to the first strongest base station when the location area of the first strongest base station is included in the permitted location area.

3. The method of claim 1, in which the at least one designated location area identity comprises a prohibited location area, and in which the method further comprises connecting to the first strongest base station when the location area of the first strongest base station is not included in the prohibited location area.

4. The method of claim 1, in which the at least one designated location area identity comprises a prohibited location area, and in which the method further comprises:

aborting a camping procedure with the first strongest base station when the first strongest base station is included in the prohibited location area.

5. The method of claim 4, further comprising determining whether a location area of a second strongest base station is included in the at least one designated location area identity.

6. The method of claim 5, further comprising connecting to the second strongest base station based on the determining.

7. A method of wireless communication comprising:

sending circuit switched (CS) paging to a user equipment (UE) from a base station of a first radio access technology (RAT); and

sending a command to the UE to redirect to a second RAT, the command including an indication of at least one designated location area identity of at least one base station of the second RAT.

8. The method of claim 7, in which the at least one designated location area identity comprises a permitted location area and in which the method further comprises:

identifying a location area of the second RAT associated with a first mobile switching center (MSC) pool, the at least one designated location area identity including the identified location area of the second RAT associated with the first mobile switching center pool.

9. The method of claim 7, in which the at least one designated location area identity comprises a prohibited location area and in which the method further comprises:

identifying a second mobile switching center pool adjacent to the first mobile switching center pool, in which the second mobile switching center pool does not support communication with the first mobile switching center pool.

10. The method of claim 9, further comprising identifying a location area of the second RAT associated with the second mobile switching center pool, the at least one designated location area identity including the location area of the second RAT associated with the second mobile switching center pool, the location area of the second RAT being the prohibited location area.

11. An apparatus for wireless communication comprising:

a memory; and

at least one processor coupled to the memory and configured;

to receive circuit switched (CS) paging from a first radio access technology (RAT);

to receive a command from the first RAT to redirect to a second RAT, the command including an indication of at least one designated location area identity of at least one base station of a plurality of base stations of the second RAT;

to detect the plurality of base stations of the second RAT;

to determine whether a location area of a first strongest base station of the plurality of base stations is included in the at least one designated location area identity; and

to connect to the first strongest base station based on the determining.

12. The apparatus of claim 11, in which the at least one designated location area identity comprises a permitted location area, and in which the at least one processor is further configured to connect to the first strongest base station when the location area of the first strongest base station is included in the permitted location area.

13. The apparatus of claim 11, in which the at least one designated location area identity comprises a prohibited location area, and in which the at least one processor is further configured to connect to the first strongest base station when the location area of the first strongest base station is not included in the prohibited location area.

14. The apparatus of claim 11, in which the at least one designated location area identity comprises a prohibited location area, and in which the at least one processor is further configured:

to abort a camping procedure with the first strongest base station when the first strongest base station is included in the prohibited location area.

15. The apparatus of claim 14, in which the at least one processor is further configured to determine whether a location area of a second strongest base station is included in the at least one designated location area identity.

16. The apparatus of claim 15, in which the at least one processor is further configured to connect to the second strongest base station based on the determining.

17. An apparatus for wireless communication comprising:

a memory; and

at least one processor coupled to the memory and configured;

to send circuit switched (CS) paging to a user equipment (UE) from a base station of a first radio access technology (RAT); and

to send a command to the UE to redirect to a second RAT, the command including an indication of at least one designated location area identity of at least one base station of the second RAT.

18. The apparatus of claim 17, in which the at least one designated location area identity comprises a permitted location area and in which the at least one processor is further configured to identify a location area of the second RAT associated with a first mobile switching center (MSC) pool, the at least one designated location area identity including the identified location area of the second RAT associated with the first mobile switching center pool.

19. The apparatus of claim 17, in which the at least one designated location area identity comprises a prohibited location area and in which the at least one processor is further configured to identify a second mobile switching center pool adjacent to the first mobile switching center pool, in which the second mobile switching center pool does not support communication with the first mobile switching center pool.

20. The apparatus of claim 19, in which the at least one processor is further configured to identifying a location area of the second RAT associated with the second mobile switching center pool, the at least one designated location area identity including the location area of the second RAT associated with the second mobile switching center pool, the location area of the second RAT being the prohibited location area.