Techniques to control UE power-usage on shared downlink shared channel region of a subframe

Patent metadata

Field	Value
Publication number	US-10667222-B2
Application number	US-201815926934-A
Country	US
Kind code	B2
Filing date	Mar 20, 2018
Priority date	Apr 13, 2017
Publication date	May 26, 2020
Grant date	May 26, 2020

Abstract

Aspects of the present disclosure provide techniques for the user equipment (UE) to select a power management mode from a plurality of power management modes supported by the UE based on decoding of a portion of the downlink subframe. For example, when the UE receives a subframe from a base station, the UE may decode a control channel region of the subframe to determine whether the subframe includes a channel grant allocated to the UE. If no channel grant is included in the subframe, the UE may select a power management mode for the UE from the plurality of power management modes supported by the UE that maximizes the UE's sleep opportunities while balancing the deficient performance costs.

First claim

What is claimed is:

1. A method for wireless communications implemented by a user equipment (UE), comprising:
receiving, at the UE, a subframe from a base station, wherein the UE supports a plurality of power management modes;
determining whether the subframe includes a channel grant allocated to the UE based on one or more of decoding a control channel region of the subframe or through radio resource control (RRC) layer signaling;
selecting a power management mode for the UE from the plurality of power management modes based on the determining; and
configuring the UE to the power management mode selected,
wherein selecting the power management mode from the plurality of power management modes based on the determining comprises:
determining at least one channel condition between the UE and the base station; and
identifying a first candidate power management mode from the plurality of power management modes based on determining the channel condition, wherein the plurality of power management mode comprises at least a full performance mode, a power-performance tradeoff mode and a power optimal mode.

2. The method of claim 1 , wherein full performance mode exhibits no performance deterioration on scheduled subframe and no power savings, the power-performance tradeoff mode optimizes power savings with negligible performance hit, and the power optimal mode maximizes power savings with a noticeable performance hit.

3. The method of claim 1 , wherein selecting the power management mode from the plurality of power management modes based on the determining comprises:
determining that the subframe includes the channel grant allocated to the UE; and
selecting the power management mode from the plurality of power management modes supported by the UE in response to the subframe including the channel grant, wherein the power management mode configures the UE to decode both the control channel region and a shared channel region of the subframe.

4. The method of claim 1 , wherein each power mode has actions which may turn on or off system components when processing the control channel region, wherein said system components include phase lock loops (PLLs), analog signal path, digital signal path, and a mixed signal path.

5. The method of claim 1 , wherein selecting the power management mode from the plurality of power management modes based on the determining comprises:
determining that the subframe fails to include the channel grant allocated to the UE; and
selecting the power management mode from the plurality of power management modes supported by the UE in response to the subframe failing to include the channel grant, wherein the power management mode configures the UE to omit decoding a shared channel region of the subframe.

6. The method of claim 1 , further comprising:
monitoring a channel grant elapsed time period, wherein the channel grant elapsed time period maintains a time period since a last channel grant received by the UE;
determining whether the channel grant elapsed time period satisfies a threshold; and
identifying a second candidate power management mode from the plurality of power management modes based on determining whether the channel grant elapsed time period satisfies the threshold.

7. The method of claim 1 , wherein selecting the power management mode comprises:
selecting the power management mode from a first candidate power management mode or a second candidate power management mode based on determining that the subframe includes the channel grant allocated to the UE, wherein the power management mode selected is a default power management mode that configures the UE to decode both the control channel region and a shared channel region of the subframe.

8. The method of claim 1 , wherein selecting the power management mode from the plurality of power management modes comprises:
selecting the power management mode from a first candidate power management mode or a second candidate power management mode based on determining that the subframe fails to include the channel grant allocated to the UE, wherein the power management mode selected configures the UE to omit decoding a shared channel region of the subframe.

9. The method of claim 8 , further comprising:
select a less performance-impacting power management mode of the two power management mode choices returned by the first candidate power management mode and the second candidate power management mode.

10. The method of claim 1 , wherein selecting the power management mode from the plurality of power management modes based on the determining comprises:
selecting a first power management mode for a first component carrier from the plurality of active component carriers; and
selecting a second power management mode for a second component carrier from the plurality of active component carriers.

11. The method of claim 1 ,
wherein selecting the power management (PM) mode from the plurality of power management modes based on the determining comprises selecting a first power management mode shared by a first set of the plurality of active component carriers and a second power management mode shared by a second set of the plurality of active component carriers.

12. The method of claim 1 , wherein selecting the power management mode from the plurality of power management modes based on the determining comprises:
monitoring connected mode discontinuous reception (CDRx) of the UE to identify number of CDRx cycles that have elapsed since last channel grant received by the UE; and
selecting the power management mode for the UE from the plurality of power management modes based on the monitoring.

13. The method of claim 1 , wherein selecting the power management mode from the plurality of power management modes based on the determining comprises:
select the power management mode that increases processing of control channel region by increasing a clock rate of the UE.

14. The method of claim 1 , wherein selecting the power management mode from the plurality of power management modes based on the determining comprises:
determining whether the UE is configured with one or more of a frame structure type 3 or evolved multimedia broadcast multicast services (eMBMS) service for secondary component carrier;
determining that primary component carrier cell radio network temporary identifier (C-RNTI) is disabled; and
forcing a power optimal power management mode from the plurality of power management modes.

15. The method of claim 1 , wherein the channel grant is in first one, two or three symbols of the subframe when the subframe includes the channel grant.

16. A user equipment (UE) for wireless communications, comprising:
a memory configured to store instructions;
a processor communicatively coupled with the memory, the processor configured to execute the instructions to:
receive, at the UE, a subframe from a base station, wherein the UE supports a plurality of power management modes;
determine whether the subframe includes a channel grant allocated to the UE based on one or more of decoding a control channel region of the subframe or through radio resource control (RRC) layer signaling;
select a power management mode for the UE from the plurality of power management modes based on the determining; and
configure the UE to the power management mode selected,

wherein the instructions to select the power management mode from the plurality of power management modes based on the determining are further configured to:
determine at least one channel condition between the UE and the base station; and
identify a fir

Assignees

• Qualcomm Inc

Inventors

• Nigam Gaurav
• Das Sibasish
• Bhattacharjee Supratik
• Verma Ankit
• Yan Hongbo
• Ehsan Navid
• Mantravadi Ashok
• Boppana Surendra

Classifications

• H04W52/325 Primary

  Power control of control or pilot channels · CPC title

• H04W52/50

  at the moment of starting communication in a multiple access environment · CPC title

• H04W72/0446

  Resources in time domain, e.g. slots or frames · CPC title

• H04W52/143

  Downlink power control · CPC title

• H04W72/042

  Electricity · mapped topic