Adaptively Determining a Wakeup Period

Patent metadata

Field	Value
Publication number	US-2016007292-A1
Application number	US-201414321534-A
Country	US
Kind code	A1
Filing date	Jul 1, 2014
Priority date	Jul 1, 2014
Publication date	Jan 7, 2016
Grant date	—

Abstract

In some implementations, a method in a user equipment (UE) for adaptively determining a wakeup period includes determining a power level of a Downlink (DL) transmission from a base station during a first wakeup period within a Discontinuous Reception (DRX) inactive time. The UE deactivates a RF receiver in response to the determination of the second wakeup period. The UE activates the RF receiver at a beginning of the second wakeup period prior to a DRX active time. The UE receives a DL paging channel transmission during the DRX active time.

First claim

What is claimed is:

1 . A method, comprising:
determining a received power level of a Downlink (DL) transmission from a base station during a first wakeup period within a Discontinuous Reception (DRX) inactive time; determining a second wakeup period based on the received power level of the DL transmission; in response to the determining, deactivating a RF receiver; activating the RF receiver at a beginning of the second wakeup period prior to a DRX active time; and receiving a DL paging channel transmission during the DRX active time.

2 . A method of claim 1 , wherein determining the second wakeup period further comprising:
determining a Signal to Noise Ratio (SNR) based on the received power level of the DL transmission and a noise reference power level; and determining the second wakeup period based on a comparison of the SNR to at least one predetermined threshold.

3 . A method of claim 2 , wherein determining the SNR further comprising:
determining a signal power offset; and determining the SNR based on the received power level of the DL transmission, the signal power offset, and the noise reference power level.

4 . A method of claim 2 , wherein the noise reference power level is determined based on a background noise level and an interference power level in a previous DRX active time.

5 . A method of claim 1 , wherein the second wakeup period is further determined based on a block error rate (BLER) of Physical Downlink Control Channel (PDCCH) messages.

6 . A method of claim 1 , further comprising:
determining a number of receiver antennas based on the received power level of the DL transmission; and receiving the DL paging channel transmission using the determined number of receiver antennas.

7 . A method of claim 1 , wherein the base station is an evolved NodeB (eNB).

8 . A method, comprising:
initiating a channel estimation operation during a wakeup period within a Discontinuous Reception (DRX) inactive time; in response to determining that a channel estimation quality indicator is lower than a predetermined threshold, storing a DL paging channel transmission, wherein a time period corresponding to the storing overlaps a time period corresponding to at least a portion of the channel estimation operation; and initiating a decoding operation to decode the stored DL paging channel transmission.

9 . The method of claim 8 , further comprising: in response to completing the channel estimation operation and the decoding operation, deactivating a RF receiver.

10 . The method of claim 8 , further comprising:
monitoring the channel estimation quality indicator during the channel estimation operation; and comparing the channel estimation quality indicator with the predetermined threshold at a beginning of a DRX active.

11 . The method of claim 8 , wherein the decoding operation is initiated in response to determining that the channel estimation quality indicator is equal to or higher than the predetermined threshold.

12 . A user equipment (UE), comprising:
one or more processors configured to:
determine a received power level of a Downlink (DL) transmission from a base station during a first wakeup period within a Discontinuous Reception (DRX) inactive time;
determine a second wakeup period based on the received power level of the DL transmission;
in response to the determining, deactivate a RF receiver;
activate the RF receiver at a beginning of the second wakeup period prior to a DRX active time; and
receive a DL paging channel transmission during the DRX active time.

13 . A user equipment (UE), comprising:
one or more processors configured to:
initiate a channel estimation operation during a wakeup period within a Discontinuous Reception (DRX) inactive time;
in response to determining that a channel estimation quality indicator is lower than a predetermined threshold, store a DL paging channel transmission, wherein a time period corresponding to the storing overlaps a time period corresponding to at least a portion of the channel estimation operation; and
initiate a decoding operation to decode the stored DL paging channel transmission.

14 . An apparatus comprising instructions embodied on a tangible, non-transitory computer-readable medium, the instructions operable when executed to cause a computing system to perform operations comprising:
determining a received power level of a Downlink (DL) transmission from a base station during a first wakeup period within a Discontinuous Reception (DRX) inactive time; determining a second wakeup period based on the received power level of the DL transmission; in response to the determining, deactivating a RF receiver; activating the RF receiver at a beginning of the second wakeup period prior to a DRX active time; and receiving a DL paging channel transmission during the DRX active time.

15 . An apparatus comprising instructions embodied on a tangible, non-transitory computer-readable medium, the instructions operable when executed to cause a computing system to perform operations comprising:
initiating a channel estimation operation during a wakeup period within a Discontinuous Reception (DRX) inactive time; in response to determining that a channel estimation quality indicator is lower than a predetermined threshold, storing a DL paging channel transmission, wherein a time period corresponding to the storing overlaps a time period corresponding to at least a portion of the channel estimation operation; and initiating a decoding operation to decode the stored DL paging channel transmission.

Assignees

• Blackberry Ltd

Inventors

• Weng Jianfeng
• Earnshaw Andrew Mark
• Jin Xin

Classifications

• H04W68/02

  Arrangements for increasing efficiency of notification or paging channel · CPC title

• H04W76/28

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

• H04W52/0235 Primary

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

• Y02D30/70

  in wireless communication networks · CPC title