Optimizing UE wakeup timeline in connected mode DRX based on CQI reporting schedule in a wireless communication system

• US 9,357,416 B2
• Filed: 09/14/2012
• Issued: 05/31/2016
• Est. Priority Date: 01/30/2012
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Banister, Brian Clarke, Mahmoud, Hisham A.
• Primary Examiner(s): Yao, Kwang B
• Assistant Examiner(s): NGO, NGUYEN HOANG
• Application Number:
  US13/620,507
• Publication Number:
  US 20130194990A1
• Time in Patent Office: 1,355 Days
• Field of Search: 370/236, 370/241, 370/252, 370/311, 370/328, 370/329
• US Class Current: 1/1
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 76/28 Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method, an apparatus, and a computer program product for wireless communication are provided in which channel quality indicator (CQI) requirements for reporting a CQI are received, whether the CQI is to be reported periodically is determined based on the CQI requirements, and a wake-up time based on the determination is scheduled. CQI reporting requirements, such as CQI scheduling information may be used to plan a UE discontinuous reception (DRX) wake-up time and adaptively shorten a duration the UE is awake when transmission of a CQI report is not required at a first subframe of a DRX on-duration. The shorter UE awake duration results in reduced power consumption.

Claims

1. A method of wireless communication, comprising:

receiving channel quality indicator (CQI) requirements for reporting a CQI;

determining whether the CQI is to be reported periodically based on the CQI requirements; and

scheduling, based on the determination, a wake-up time to enable processing of downlink information and transmission of the CQI,

wherein the scheduling the wake-up time is further based on a number of subframes required to generate a CQI report and an offset between a first subframe of an on-duration and a subframe in which the CQI is determined to be transmitted, and

wherein the wake-up time is scheduled prior to the first subframe of the on-duration when the number of subframes required to generate the CQI report is greater than the offset between the first subframe of the on-duration and the subframe in which the CQI is determined to be transmitted.

2. The method of claim 1, wherein the scheduling the wake-up time comprises:

scheduling to wake to enable processing of the downlink information at the first subframe of the on-duration when the CQI is determined not to be reported periodically, wherein the on-duration is a duration over which a downlink control channel is monitored every discontinuous reception (DRX) cycle.

3. The method of claim 1, wherein the scheduling the wake-up time comprises:

determining whether the CQI is to be transmitted during any one of x subframes immediately after a start of the on-duration when the CQI is determined to be reported periodically,

wherein the on-duration is adoration over which a downlink control channel is monitored every discontinuous reception (DRX) cycle, and

wherein x is a number of subframes required to generate a CQI report.

4. The method of claim 3, wherein the scheduling the wake-up time further comprises:

scheduling to wake to enable processing of downlink information at a subframe that is x-y subframes immediately before the start of the on-duration when the CQI is determined to be transmitted during any one of the x subframes immediately after the start of the on-duration,

wherein y is the offset between a first subframe of the on-duration and one of the x subframes at which the CQI is to be transmitted, and

wherein y is less than x.

5. The method of claim 4, wherein the scheduling the wake-up time further comprises:

scheduling to wake to enable processing of downlink information at the first subframe of the on-duration when y is greater than or equal to x.

6. The method of claim 3, wherein the scheduling the wake-up time further comprises:

scheduling to wake to enable processing of downlink information at the first subframe of the on-duration when the CQI is determined not to be transmitted during any one of the x subframes immediately after the start of the on-duration.

7. An apparatus for wireless communication, comprising:

means for receiving channel quality indicator (CQI) requirements for reporting a CQI;

means for determining whether the CQI is to be reported periodically based on the CQI requirements; and

means for scheduling, based on the determination, a wake-up time to enable processing of downlink information and transmission of the CQI,

wherein the means for scheduling is configured to schedule the wake-up time based on a number of subframes required to generate a CQI report and an offset between a first subframe of an on-duration and a subframe in which the CQI is determined to be transmitted, and

wherein the wake-up time is scheduled prior to the first subframe of the on-duration when the number of subframes required to generate the CQI report is greater than the offset between the first subframe of the on-duration and the subframe in which the CQI is determined to be transmitted.

8. The apparatus of claim 7, wherein the means for scheduling the wake-up time is configured to:

schedule to wake to enable processing of the downlink information at the first subframe of the on-duration when the CQI is determined not to be reported periodically, wherein the on-duration is a duration over which a downlink control channel is monitored every discontinuous reception (DRX) cycle.

9. The apparatus of claim 7, wherein means for scheduling the wake-up time is configured Co:

determine whether the CQI is to be transmitted during any one of x subframes immediately after a start of the on-duration when the CQI is determined to be reported periodically,

wherein the on-duration is a duration over which a downlink control channel is monitored every discontinuous reception (DRX) cycle, and

wherein x is a number of subframes required to generate a CQI report.

10. The apparatus of claim 9, wherein the means for scheduling the wake-up time is further configured to:

schedule to wake to enable processing of downlink information at a subframe that is x-y subframes immediately before the start of the on-duration when the CQI is determined to be transmitted during any one of the x subframes immediately after the start of the on-duration,

wherein y is the offset between a first subframe of the on-duration and one of the x subframes at which the CQI is to be transmitted, and

wherein y is less than x.

11. The apparatus of claim 10, wherein the means for scheduling the wake-up time is further configured to:

schedule to wake to enable processing of downlink information at the first subframe of the on-duration when y is greater than or equal to x.

12. The apparatus of claim 9, wherein the means for scheduling the wake-up time is further configured to:

schedule to wake to enable processing of downlink information at the first subframe of the on-duration when the CQI is determined not to be transmitted during any one of the x subframes immediately after the start of the on-duration.

13. An apparatus for wireless communication, comprising:

a memory; and

at least one processor coupled to the memory and configured to;

receive channel quality indicator (CQI) requirements for reporting a CQI;

determine whether the CQI is to be reported periodically′

based on the CQI requirements; and

schedule, based on the determination, a wake-up time to enable processing of downlink information and transmission of the CQI,

wherein the at least one processor is configured to schedule the wake-up time further based on a number of subframes required to generate a CQI report and an offset between a first subframe of an on-duration and a subframe in which the CQI is determined to be transmitted, and

wherein the wake-up time is scheduled prior to the first subframe of the on-duration when the number of subframes required to generate the CQI report is greater than the offset between the first subframe of the on-duration and the subframe in which the CQI is determined to be transmitted.

14. The apparatus of claim 13, wherein the at least one processor coupled to the memory is further configured to:

schedule to wake to enable processing of the downlink information at the first subframe of the on-duration when the CQI is determined not to be reported periodically, wherein the on-duration is a duration over which a downlink control channel is monitored every discontinuous reception (DRX) cycle.

15. The apparatus of claim 13, wherein the at least one processor coupled to the memory is further configured to:

determine whether the CQI is to be transmitted during any one of x subframes immediately after a start of the on-duration when the CQI is determined to be reported periodically,

wherein the on-duration is a duration over which a downlink control channel is monitored every discontinuous reception (DRX) cycle, and

wherein x is a number of subframes required to generate a CQI report.

16. The apparatus of claim 15, wherein the at least one processor coupled to the memory is further configured to:

schedule to wake to enable processing of downlink information at a subframe that is x-y subframes immediately before the start of the on-duration when the CQI is determined to be transmitted during any one of the x subframes immediately after the start of the on-duration,

wherein y is the offset between a first subframe of the on-duration and one of the x subframes at which the CQI is to be transmitted, and

wherein y is less than x.

17. The apparatus of claim 16, wherein the at least one processor coupled to the memory is further configured to:

schedule to wake to enable processing of downlink information at the first subframe of the on-duration when y is greater than or equal to x.

18. The apparatus of claim 15, wherein the at least one processor coupled to the memory is further configured to:

schedule to wake to enable processing of downlink information at the first subframe of the on-duration when the CQI is determined not to be transmitted during any one of the x subframes immediately after the start of the on-duration.

19. A non-transitory computer-readable medium storing code that when executed on at least one processor causes the at least one processor to:

receive channel quality indicator (CQI) requirements for reporting a CQI;

determine whether the CQI is to be reported periodically based on the CQI requirements; and

schedule, based on the determination, a wake-up time to enable processing of downlink information and transmission of the CQI,

wherein the code for scheduling the wake-up time is configured to schedule the wakeup time further based on a number of subframes required to generate a CQI report and an offset between a first subframe of an on-duration and a subframe in which the CQI is determined to be transmitted, and

wherein the wake-up time is scheduled prior to the first subframe of the on-duration when the number of subframes required to generate the CQI report is greater than the offset between the first subframe of the on-duration and the subframe in which the CQI is determined to be transmitted.

20. The non-transitory computer-readable medium of claim 19, wherein the code for scheduling the wake-up time is configured to:

schedule to wake to enable processing of the downlink information at the first subframe of the on-duration when the CQI is determined not to be reported periodically, wherein the on-duration is a duration over which a downlink control channel is monitored every discontinuous reception (DRX) cycle.

21. The non-transitory computer-readable medium of claim 19, wherein the code for scheduling the wake-up time is configured to:

determine whether the CQI is to be transmitted during any one of x subframes immediately after a start of the on-duration when the CQI is determined to be reported periodically,

wherein the on-duration is adoration over which a downlink control channel is monitored every discontinuous reception (DRX) cycle, and

wherein x is a number of subframes required to generate a CQI report.

22. The non-transitory computer-readable medium of claim 21, wherein the code for scheduling the wake-up time is further configured to:

schedule to wake to enable processing of downlink information at a subframe that is x-y subframes immediately before the start of the on-duration when the CQI is determined to be transmitted during any one of the x subframes immediately after the start of the on-duration,

wherein y is the offset between a first subframe of the on-duration and one of the x subframes at which the CQI is to be transmitted, and

wherein y is less than x.

23. The non-transitory computer-readable medium of claim 22, wherein the code for scheduling the wake-up time is further configured to:

schedule to wake to enable processing of downlink information at the first subframe of the on-duration when y is greater than or equal to x.

24. The non-transitory computer-readable medium of claim 21, wherein the code for scheduling the wake-up time is further configured to:

schedule to wake to enable processing of downlink information at the first subframe of the on-duration when the CQI is determined not to be transmitted during any one of the x subframes immediately after the start of the on-duration.