Intelligent skipping of interfering frequency measurements in UE measurement gaps

• US 9,480,071 B2
• Filed: 12/10/2014
• Issued: 10/25/2016
• Est. Priority Date: 12/10/2014
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Krishnamoorthy, Parthasarathy, Mohan, Prashanth, Rajendran, Aravinth, Alimineti, Janga Reddy, Vasanthasenan, Krishnakumar, Rajurkar, Anand
• Primary Examiner(s): Siddiqui, Kashif
• Application Number:
  US14/566,017
• Publication Number:
  US 20160174232A1
• Time in Patent Office: 685 Days
• US Class Current: 1/1
• CPC Class Codes: H04B 1/10 Means associated with receiver for limiting or suppressing noise or interference
• CPC Class Codes: H04B 1/1027 assessing signal quality or detecting noise/interference for the received signal
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 36/0083 Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
• CPC Class Codes: H04W 36/00837 Determination of triggering parameters for hand-off
• CPC Class Codes: H04W 36/008375 based on historical data
• CPC Class Codes: H04W 36/302 due to low signal strength
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 8/183 Processing at user equipment or user record carrier
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Various embodiments implemented on a mobile communication device provide methods for skipping power measurements of frequency bands included in a list of frequency bands received from a first subscription'"'"'s network to conserve power and to increase the likelihood of avoiding a coexistence event between a first subscription and a second subscription. Specifically, a processor of the mobile communication device may order the list of frequency bands such that non-interfering frequency bands are ordered before interfering frequency bands. The processor may then take power measurements of frequency bands in the list, in order, until the processor determines that a power measurement has satisfied a minimum power threshold. In response to such a determination, the device processor may report the power measurement that satisfies the minimum power threshold to the first subscription'"'"'s network and may not take any more power measurements of the remaining frequency bands in the list.

Claims

1. A method implemented on a multi-subscription mobile communication device for avoiding a coexistence event between a first subscription and a second subscription, comprising:

determining an amount of interference that frequency bands in a list of frequency bands available to the first subscription would impose on frequency bands used by the second subscription;

ordering the list of frequency bands in order of increasing interference with frequency bands used by the second subscription;

taking power measurements of frequency bands in the ordered list in order;

determining whether a power measurement for a frequency band satisfies a minimum power threshold; and

in response to determining that a power measurement for a frequency band satisfies the minimum power threshold;

suspending further power measurements of remaining frequency bands in the ordered list; and

reporting the power measurement that satisfies the minimum power threshold to a network of the first subscription.

2. The method of claim 1, wherein determining an amount of interference that frequency bands in a list of frequency bands available to the first subscription would impose on frequency bands used by the second subscription comprises determining an amount of coexistence interference that each frequency band in the list of frequency bands would impose on a frequency band used by the second subscription.

3. The method of claim 1, further comprising identifying frequency bands in the list of frequency bands available to the first subscription that will interfere (“

interfering frequency bands”

) with frequency bands used by the second subscription by an amount of coexistence interference that equals or exceeds a maximum interference threshold.

4. The method of claim 3, further comprising:

identifying frequency bands in the list of frequency bands available to the first subscription that will not interfere (“

non-interfering frequency bands”

) with frequency bands used by the second subscription,

wherein ordering the list of frequency bands in order of increasing interference with frequency bands used by the second subscription comprises ordering the list of frequency bands such that non-interfering frequency bands are ordered before interfering frequency bands.

5. The method of claim 1, further comprising performing a handover operation in the first subscription to the frequency band that satisfies the minimum power threshold in response to instructions received from the network of the first subscription.

6. The method of claim 1, further comprising receiving the list of frequency bands available to the first subscription from the network of the first subscription.

7. The method of claim 1, wherein ordering the list of frequency bands in order of increasing interference with frequency bands used by the second subscription comprises generating an ordered index of the list of frequency bands.

8. The method of claim 1, wherein ordering the list of frequency bands in order of increasing interference with frequency bands used by the second subscription comprises adding a ranking value to entries in the list of frequency bands.

9. The method of claim 1, further comprising monitoring for a coexistence event between the first subscription and the second subscription, wherein operations of the method of claim 1 are performed in response to detecting that a coexistence event has started or is scheduled to start.

10. A multi-subscription mobile communication device, comprising:

a first wireless transceiver;

a second wireless transceiver; and

a processor coupled to the first and second wireless transceivers and configured with processor-executable instructions to;

determine an amount of interference that frequency bands in a list of frequency bands available to a first subscription would impose on frequency bands used by a second subscription;

order the list of frequency bands in order of increasing interference with frequency bands used by the second subscription;

take power measurements of frequency bands in the ordered list in order;

determine whether a power measurement for a frequency band satisfies a minimum power threshold; and

in response to determining that a power measurement for a frequency band satisfies the minimum power threshold;

suspend further power measurements of remaining frequency bands in the ordered list; and

report the power measurement that satisfies the minimum power threshold to a first network communicating with the first wireless transceiver.

11. The multi-subscription mobile communication device of claim 10, wherein the processor is further configured with processor-executable instructions to determine the amount of interference that frequency bands in a list of frequency bands available to the first subscription would impose on frequency bands used by the second subscription based on an amount of coexistence interference that each frequency band in the list of frequency bands would impose on a frequency band used by the second subscription.

12. The multi-subscription mobile communication device of claim 10, wherein the processor is further configured with processor-executable instructions to identify frequency bands in the list of frequency bands available to the first subscription that will interfere (“

interfering frequency bands”

) with frequency bands used by the second subscription by an amount of coexistence interference that equals or exceeds a maximum interference threshold.

13. The multi-subscription mobile communication device of claim 12, wherein the processor is further configured with processor-executable instructions to:

identify frequency bands in the list of frequency bands available to the first subscription that will not interfere (“

non-interfering frequency bands”

) with frequency bands used by the second subscription; and

order the list of frequency bands in order of increasing interference with frequency bands used by the second subscription such that non-interfering frequency bands are ordered before interfering frequency bands.

14. The multi-subscription communication device of claim 10, wherein the processor is further configured with processor-executable instructions to perform a handover operation in the first subscription to the frequency band that satisfies the minimum power threshold in response to instructions received from the first network of the first subscription.

15. The multi-subscription mobile communication device of claim 10, wherein the processor is further configured with processor-executable instructions to receive the list of frequency bands from the first network of the first subscription.

16. The multi-subscription mobile communication device of claim 10, wherein the processor is further configured with processor-executable instructions to order the list of frequency bands in order of increasing interference with frequency bands used by the second subscription by generating an ordered index of the list of frequency bands.

17. The multi-subscription mobile communication device of claim 10, wherein the processor is further configured with processor-executable instructions to order the list of frequency bands in order of increasing interference with frequency bands used by the second subscription by adding a ranking value to entries in the list of frequency bands.

18. The multi-subscription mobile communication device of claim 10, wherein the processor is further configured with processor-executable instructions to:

monitor for a coexistence event between the first subscription and the second subscription; and

perform operations of claim 10 in response to detecting that a coexistence event has started or is scheduled to start.

19. A multi-subscription mobile communication device, comprising:

means for determining an amount of interference that frequency bands in a list of frequency bands available to a first subscription would impose on frequency bands used by a second subscription;

means for taking power measurements of frequency bands in the list of frequency bands in order of increasing interference with frequency bands used by the second subscription;

means for determining whether a power measurement for a frequency band satisfies a minimum power threshold;

means for suspending further power measurements of remaining frequency bands in response to determining that a power measurement for a frequency band satisfies the minimum power threshold; and

means for reporting the power measurement that satisfies the minimum power threshold to a network of a first subscription.

20. A method implemented on a multi-subscription mobile communication device for avoiding a coexistence event between a first subscription and a second subscription, comprising:

identifying frequency bands in a list of frequency bands available to the first subscription that will not interfere (“

non-interfering frequency bands”

) with frequency bands used by the second subscription;

taking power measurements of non-interfering frequency bands until a power measurement of a non-interfering frequency band satisfies a minimum power threshold;

suspending further power measurements of remaining non-interfering frequency bands in response to determining that a power measurement for a non-interfering frequency band that satisfies the minimum power threshold; and

reporting the power measurement that satisfies the minimum power threshold to a network of the first subscription.

21. The method of claim 20, wherein non-interfering frequency bands are frequency bands that do not exhibit coexistence interference with a frequency band of the second subscription.

22. The method of claim 20, further comprising performing a handover operation in the first subscription to the frequency band that satisfies the minimum power threshold in response to instructions received from the network of the first subscription.

23. The method of claim 20, further comprising receiving the list of frequency bands from the network of the first subscription.

24. The method of claim 20, further comprising monitoring for a coexistence event between the first subscription and the second subscription, wherein operations of the method of claim 20 are performed in response to detecting that a coexistence event has started or is scheduled to start.

25. The method of claim 20, further comprising:

in response to taking power measurements of all identified non-interfering frequency bands without determining that a power measurement for a frequency band satisfies the minimum power threshold, the method further comprising;

determining an amount of coexistence interference associated with frequency bands in the list of frequency bands available to the first subscription that will interfere (“

interfering frequency bands”

) with frequency bands used by the second subscription;

taking power measurements of the interfering frequency bands in order of coexistence interference based on the determined amounts of coexistence interference; and

in response to determining that a power measurement for an interfering frequency band satisfies the minimum power threshold;

suspending further power measurements of remaining interfering frequency bands; and

reporting the power measurement that satisfies the minimum power threshold to the network of the first subscription.

26. The method of claim 25, wherein interfering frequency bands are frequency bands that exhibit an amount of coexistence interference with a frequency band of the second subscription that equals or exceeds a maximum interference threshold.

27. The method of claim 25, further comprising performing a handover operation in the first subscription to the frequency band that satisfies the minimum power threshold in response to instructions received from the network of the first subscription.

28. The method of claim 25, further comprising monitoring for a coexistence event between the first subscription and the second subscription, wherein operations of the method of claim 25 are performed in response to detecting that a coexistence event has started or is scheduled to start.