Drx power usage by dynamically adjusting a warmup period

Patent metadata

Field	Value
Publication number	US-2016014695-A1
Application number	US-201414329731-A
Country	US
Kind code	A1
Filing date	Jul 11, 2014
Priority date	Jul 11, 2014
Publication date	Jan 14, 2016
Grant date	—

Abstract

Methods, systems, and devices are described for improving discontinuous reception (DRX) power usage by dynamically updating (e.g., adjusting) a warmup period. A user equipment (UE) communicating with a wireless network may operate in DRX mode by periodically powering down radio components. For example, during a first DRX On Duration, the UE may estimate the variance in channel conditions. The UE may then update the baseband convergence portion of the warmup time prior to the upcoming DRX On Duration. The UE may reduce the baseband convergence period or increase the baseband convergence period based on a function of the channel variance. The UE may also maintain a table relating a set of channel variance values with a set of baseband convergence periods, and update the baseband convergence period based on the table.

First claim

What is claimed is:

1 . A method of wireless communication at a user equipment (UE), comprising:
communicating over a wireless channel in a discontinuous reception (DRX) mode for a time period comprising a first on duration of a first DRX cycle and a second on duration of a second DRX cycle; estimating a channel variance for the wireless channel based on a set of parameters comprising at least one parameter measured during the first DRX cycle; and updating a baseband convergence period for the second on duration of the second DRX cycle based on the estimated channel variance.

2 . The method of claim 1 , wherein the set of parameters comprises at least one of a Doppler measurement, an acceleration measurement, a channel correlation measurement, a signal-to-noise ratio (SNR), or a DRX gap length.

3 . The method of claim 1 , wherein the baseband convergence period comprises at least one of a time period for automatic gain control, a time period for frequency tracking loop convergence, or a time period for time tracking loop convergence.

4 . The method of claim 1 , further comprising:
updating the baseband convergence period comprises reducing the baseband convergence period based on a function relating the estimated channel variance to a time for a baseband convergence period based on a function relating the estimated channel variance to a time for a baseband convergence period.

5 . The method of claim 1 , further comprising:
updating the baseband convergence period comprises increasing the baseband convergence period based on a function relating the estimated channel variance to a time for a baseband convergence period based on a function relating the estimated channel variance to a time for a baseband convergence period.

6 . The method of claim 1 , further comprising:
maintaining a table relating a set of channel variance values with a set of baseband convergence periods; and wherein updating the baseband convergence period comprises updating the baseband convergence period based on a lookup of the estimated channel variance in the table.

7 . The method of claim 1 , further comprising:
activating a radio at a warmup time prior to the second on duration of the second DRX cycle, wherein the warmup time is based on the updated baseband convergence period.

8 . The method of claim 7 , wherein the warmup time is further based on a time period for generating a channel quality indicator (CQI) report.

9 . The method of claim 7 , wherein the warmup time is further based on a duplexing configuration of the wireless channel, the duplexing configuration comprising a frequency division duplex (FDD) configuration or a time division duplex (TDD) configuration.

10 . An apparatus for wireless communication at a user equipment (UE), comprising:
means for communicating over a wireless channel in a discontinuous reception (DRX) mode for a time period comprising a first on duration of a first DRX cycle and a second on duration of a second DRX cycle; means for estimating a channel variance for the wireless channel based on a set of parameters comprising at least one parameter measured during the first DRX cycle; and means for updating a baseband convergence period for the second on duration of the second DRX cycle based on the estimated channel variance.

11 . The apparatus of claim 10 , wherein the set of parameters comprises at least one of a Doppler measurement, an acceleration measurement, a channel correlation measurement, a signal-to-noise ratio (SNR), or a DRX gap length.

12 . The apparatus of claim 10 , wherein the baseband convergence period comprises at least one of a time period for automatic gain control, a time period for frequency tracking loop convergence, or a time period for time tracking loop convergence.

13 . The apparatus of claim 10 , further comprising:
means for reducing the baseband convergence period based on a function relating the estimated channel variance to a time for a baseband convergence period.

14 . The apparatus of claim 10 , further comprising:
means for increasing the baseband convergence period based on a function relating the estimated channel variance to a time for a baseband convergence period.

15 . The apparatus of claim 10 , further comprising:
means for maintaining a table relating a set of channel variance values with a set of baseband convergence periods; and means for updating the baseband convergence period based on a lookup of the estimated channel variance in the table.

16 . The apparatus of claim 10 , further comprising:
means for activating a radio at a warmup time prior to the second on duration of the second DRX cycle, wherein the warmup time is based on the updated baseband convergence period.

17 . The apparatus of claim 16 , wherein the warmup time is further based on a time period for generating a channel quality indicator (CQI) report.

18 . The apparatus of claim 16 , wherein the warmup time is further based on a duplexing configuration of the wireless channel, the duplexing configuration comprising a frequency division duplex (FDD) configuration or a time division duplex (TDD) configuration.

19 . An apparatus for wireless communication at a user equipment (UE), comprising a processor, memory in electronic communication with the processor and instructions stored in the memory, the instructions being executable by the processor to:
communicate over a wireless channel in a discontinuous reception (DRX) mode for a time period comprising a first on duration of a first DRX cycle and a second on duration of a second DRX cycle; estimate a channel variance for the wireless channel based on a set of parameters comprising at least one parameter measured during the first DRX cycle; and update a baseband convergence period for the second on duration of the second DRX cycle based on the estimated channel variance.

20 . The apparatus of claim 19 , wherein the set of parameters comprises at least one of a Doppler measurement, an acceleration measurement, a channel correlation measurement, a signal-to-noise ratio (SNR), or a DRX gap length.

21 . The apparatus of claim 19 , wherein the baseband convergence period comprises at least one of a time period for automatic gain control, a time period for frequency tracking loop convergence, or a time period for time tracking loop convergence.

22 . The apparatus of claim 19 , wherein the instructions are further executable by the processor to:
reduce the baseband convergence period based on a function relating the estimated channel variance to a time for a baseband convergence period.

23 . The apparatus of claim 19 , wherein the instructions are further executable by the processor to:
increase the baseband convergence period based on a function relating the estimated channel variance to a time for a baseband convergence period.

24 . The apparatus of claim 19 , wherein the instructions are further executable by the processor to:
maintain a table relating a set of channel variance values with a set of baseband convergence periods; and update the baseband convergence period based on a lookup of the estimated channel variance in the table.

25 . The apparatus of claim 19 , wherein the instructions are further executable by the processor to:
activate a radio at a warmup time prior to the second on duration of the second DRX cycle, wherein the warmup time is based on the updated bas

Assignees

• Qualcomm Inc

Inventors

• Ehsan Navid
• Challa Raghu Narayan
• Zhang Chengjin

Classifications

• H04L5/14

  Two-way operation using the same type of signal, i.e. duplex · CPC title

• H04W52/0235 Primary

  where the received signal is a power saving command · CPC title

• Y02D30/70

  in wireless communication networks · CPC title

• H04W76/28

  Discontinuous transmission [DTX]; Discontinuous reception [DRX] · CPC title