MEASUREMENT REPORTING FOR CIRCUIT SWITCHED FALL BACK SERVICES

• US 20160337928A1
• Filed: 05/15/2015
• Published: 11/17/2016
• Est. Priority Date: 05/15/2015
• Status: Abandoned Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: YANG, Ming, CHIN, Tom, QU, Shaohong
• Application Number:
  US14/714,181
• Publication Number:
  US 20160337928A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 43/06 Generation of reports
• CPC Class Codes: H04W 36/00224 between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
• CPC Class Codes: H04W 36/00837 Determination of triggering parameters for hand-off
• CPC Class Codes: H04W 36/0085 Hand-off measurements
• CPC Class Codes: H04W 36/302 due to low signal strength
• CPC Class Codes: H04W 36/305 Handover due to radio link failure control signalling for hand-off failure H04W36/0079

Abstract

A method of wireless communication at a user equipment (UE) includes initiating a procedure for a circuit switched fall back (CSFB) service in response to a mobile originated voice call or a mobile terminated voice call in a radio access technology (RAT) not supporting circuit switched voice calls. The method further includes determining whether a time to trigger (TTT) timer has expired for a measurement report configured to trigger a handover to a target cell. The method also includes determining whether the target cell is of a RAT supporting circuit-switched voice calls. If so, sending of the measurement report is delayed, i.e., when the RAT of the target cell does not support circuit-switched voice calls.

Claims

1. A method of wireless communication at a user equipment (UE), comprising:

initiating a procedure for a circuit switched fall back (CSFB) service in response to a mobile originated voice call or a mobile terminated voice call in a radio access technology (RAT) not supporting circuit switched voice calls;

determining whether a time to trigger (TTT) timer has expired for a measurement report configured to trigger a handover to a target cell;

determining whether the target cell is of a RAT supporting circuit-switched voice calls; and

delaying sending of the measurement report when the RAT of the target cell does not support circuit-switched voice calls.

2. The method of claim 1, further comprising suspending an inter-frequency measurement, an intra-frequency measurement, an inter-RAT measurement, or a combination thereof, after initiating the procedure for the CSFB service when a signal quality of a serving cell is above a threshold and the RAT of the target cell does not support circuit-switched voice calls.

3. The method of claim 2, in which delaying sending of the measurement report comprises determining whether to delay reporting of the inter-frequency measurement, the inter-frequency measurement, the inter-RAT measurement, or a combination thereof, based at least in part on a signal quality difference between the serving cell and the target cell and on the signal quality of the serving cell.

4. The method of claim 1, further comprising sending the measurement report without delay when the RAT of the target cell supports circuit-switched voice calls.

5. The method of claim 4, further comprising initiating the handover to the target cell when the RAT of the target cell supports circuit-switched voice calls.

6. The method of claim 1, in which determining whether the target cell is of the RAT supporting circuit-switched voice calls comprises evaluating a CSFB history at the UE and/or a network ID obtained from system information messages.

7. An apparatus for wireless communication, comprising:

a memory; and

at least one processor coupled to the memory and configured;

to initiate a procedure for a circuit switched fall back (CSFB) service in response to a mobile originated voice call or a mobile terminated voice call in a radio access technology (RAT) not supporting circuit switched voice calls;

to determine whether a time to trigger (TTT) timer has expired for a measurement report configured to trigger a handover to a target cell;

to determine whether the target cell is of a RAT supporting circuit-switched voice calls; and

to delay sending of the measurement report when the RAT of the target cell does not support circuit-switched voice calls.

8. The apparatus of claim 7, in which the at least one processor is further configured to suspend an inter-frequency measurement, an intra-frequency measurement, an inter-RAT measurement, or a combination thereof, after initiating the procedure for the CSFB service when a signal quality of a serving cell is above a threshold and the RAT of the target cell does not support circuit-switched voice calls.

9. The apparatus of claim 8, in which the at least one processor is further configured to delay sending of the measurement report by determining whether to delay reporting of the inter-frequency measurement, the inter-frequency measurement, the inter-RAT measurement, or a combination thereof, based at least in part on a signal quality difference between the serving cell and the target cell and on the signal quality of the serving cell.

10. The apparatus of claim 7, in which the at least one processor is further configured to send the measurement report without delay when the RAT of the target cell supports circuit-switched voice calls.

11. The apparatus of claim 10, in which the at least one processor is further configured to initiate the handover to the target cell when the RAT of the target cell supports circuit-switched voice calls.

12. The apparatus of claim 7, in which the at least one processor is further configured to determine whether the target cell is of the RAT supporting circuit-switched voice calls by evaluating a CSFB history at a user equipment (UE) and/or a network ID obtained from system information messages.

13. An apparatus for wireless communication, comprising:

means for initiating a procedure for a circuit switched fall back (CSFB) service in response to a mobile originated voice call or a mobile terminated voice call in a radio access technology (RAT) not supporting circuit switched voice calls;

means for determining whether a time to trigger (TTT) timer has expired for a measurement report configured to trigger a handover to a target cell;

means for determining whether the target cell is of a RAT supporting circuit-switched voice calls; and

means for delaying sending of the measurement report when the RAT of the target cell does not support circuit-switched voice calls.

14. The apparatus of claim 13, further comprising means for suspending an inter-frequency measurement, an intra-frequency measurement, an inter-RAT measurement, or a combination thereof, after initiating the procedure for the CSFB service when a signal quality of a serving cell is above a threshold and the RAT of the target cell does not support circuit-switched voice calls.

15. The apparatus of claim 14, in which the means for delaying sending of the measurement report comprises determining whether to delay reporting of the inter-frequency measurement, the inter-frequency measurement, the inter-RAT measurement, or a combination thereof, based at least in part on a signal quality difference between the serving cell and the target cell and on the signal quality of the serving cell.

16. The apparatus of claim 13, further comprising means for sending the measurement report without delay when the RAT of the target cell supports circuit-switched voice calls.

17. The apparatus of claim 16, further comprising means for initiating the handover to the target cell when the RAT of the target cell supports circuit-switched voice calls.

18. The apparatus of claim 13, in which the means for determining whether the target cell is of the RAT supporting circuit-switched voice calls comprises evaluating a CSFB history at a user equipment (UE) and/or a network ID obtained from system information messages.

19. A computer program product for wireless communication, comprising:

a non-transitory computer readable medium having encoded thereon program code, the program code comprising;

program code to initiate a procedure for a circuit switched fall back (CSFB) service in response to a mobile originated voice call or a mobile terminated voice call in a radio access technology (RAT) not supporting circuit switched voice calls;

program code to determine whether a time to trigger (TTT) timer has expired for a measurement report configured to trigger a handover to a target cell;

program code to determine whether the target cell is of a RAT supporting circuit-switched voice calls; and

program code to delay sending of the measurement report when the RAT of the target cell does not support circuit-switched voice calls.

20. The computer program product of claim 19, further comprising program code to suspend an inter-frequency measurement, an intra-frequency measurement, an inter-RAT measurement, or a combination thereof, after initiating the procedure for the CSFB service when a signal quality of a serving cell is above a threshold and the RAT of the target cell does not support circuit-switched voice calls.

21. The computer program product of claim 20, in which the program code to delay sending of the measurement report determines whether to delay reporting of the inter-frequency measurement, the inter-frequency measurement, the inter-RAT measurement, or a combination thereof, based at least in part on a signal quality difference between the serving cell and the target cell and on the signal quality of the serving cell.

22. The computer program product of claim 19, further comprising program code to send the measurement report without delay when the RAT of the target cell supports circuit-switched voice calls.

23. The computer program product of claim 22, further comprising program code to initiate the handover to the target cell when the RAT of the target cell supports circuit-switched voice calls.

24. The computer program product of claim 19, in which the program code to determine whether the target cell is of the RAT supporting circuit-switched voice calls evaluates a CSFB history at a user equipment (UE) and/or a network ID obtained from system information messages.