Power saving for tight coupled interworking

Patent metadata

Field	Value
Publication number	US-2016143085-A1
Application number	US-201414542278-A
Country	US
Kind code	A1
Filing date	Nov 14, 2014
Priority date	Nov 14, 2014
Publication date	May 19, 2016
Grant date	—

Abstract

In some implementations, a power saving method includes receiving, from a base station, at a user equipment (UE), a Discontinuous Reception (DRX) configuration. The UE determines a WLAN listen interval that includes at least one Traffic Indication Map (TIM) period and at least one TIM transmission period. The UE selects, based on the DRX configuration, a TIM message to monitor within an associated TIM transmission period from the at least one TIM transmission period in the listen interval. The UE determines a WLAN wakeup time that overlaps the associated TIM transmission period. During the associated TIM transmission periods, the UE receives, from an Access Point (AP), the selected TIM message.

First claim

What is claimed is:

1 . A method for determining a Wireless Local Area Network (WLAN) wakeup time, comprising:
receiving, from a base station, at a user equipment (UE), a Discontinuous Reception (DRX) configuration; determining a WLAN listen interval that includes at least one Traffic Indication Map (TIM) period and at least one TIM transmission period; selecting, based on the DRX configuration , a TIM message to monitor within an associated TIM transmission period from the at least one TIM transmission period in the listen interval; determining a WLAN wakeup time that overlaps the associated TIM transmission period; and during the associated TIM transmission periods, receiving, from an Access Point (AP), the selected TIM message.

2 . The method of claim 1 , wherein selecting the TIM message comprises:
determining a final TIM message, wherein the final TIM message is the last TIM message transmitted within the listen interval; determining that a DRX On duration occurs between the final TIM message and an expiration of the listen interval; and selecting the final TIM message as the TIM message to monitor.

3 . The method of claim 1 , wherein selecting the TIM message comprises:
determining a final TIM message, wherein the final TIM message is the last TIM message transmitted within the listen interval; determining that the final TIM message is transmitted between an expiration of the listen interval and an DRX On duration immediately preceding the expiration of the listen interval; and selecting a second TIM message as the TIM message to monitor, wherein the second TIM message is a TIM message that is transmitted immediately prior to the final TIM message.

4 . The method of claim 1 , further comprising:
transmitting a PS_Poll frame to the AP, wherein the PS_Poll frame comprises a request to retrieve a buffered Downlink (DL) data for the UE.

5 . The method of claim 4 , wherein the PS_Poll frame is transmitted on a DRX On duration that is configured by the DRX configuration.

6 . The method of claim 1 , further comprising:
transmitting an uplink data packet to the AP during a DRX active time, wherein the DRX active time includes at least one subframe that the UE monitors for a Downlink transmission from the base station.

7 . The method of claim 1 , wherein the selected TIM message indicates whether the AP buffers downlink data for the UE.

8 . A method, comprising:
receiving, from a base station, at a user equipment (UE), a DRX configuration; determining, at the UE, a WLAN power saving configuration based on the DRX configuration, wherein the WLAN power saving configuration comprises a listen interval; and transmitting, to an Access Point (AP), the WLAN power saving configuration.

9 . A method, comprising:
transmitting, to a base station, a DRX configuration request, wherein the DRX configuration request comprises a DRX assistance report that is based on a WLAN power saving configuration; receiving, from the base station, a DRX configuration, wherein the DRX configuration is determined based on the DRX assistance report; and configuring at least one DRX cycle based on the DRX configuration.

10 . A user equipment (UE), comprising:
one or more processors configured to:
receive, from a base station, a Discontinuous Reception (DRX) configuration;
determine a WLAN listen interval that includes at least one Traffic Indication Map (TIM) period and at least one TIM transmission period;
select, based on the DRX configuration, a TIM message to monitor within an associated TIM transmission period from the at least one TIM transmission period in the listen interval;
determine a WLAN wakeup time that overlaps the associated TIM transmission period; and
during the associated TIM transmission periods, receive, from an Access Point (AP), the selected TIM message.

11 . The UE of claim 10 , wherein selecting the TIM message comprises:
determining a final TIM message, wherein the final TIM message is the last TIM message transmitted within the listen interval; determining that a DRX On duration occurs between the final TIM message and an expiration of the listen interval; and selecting the final TIM message as the TIM message to monitor.

12 . The UE of claim 10 , wherein selecting the TIM message comprises:
determining a final TIM message, wherein the final TIM message is the last TIM message transmitted within the listen interval; determining that the final TIM message is transmitted between an expiration of the listen interval and an DRX On duration immediately preceding the expiration of the listen interval; and selecting a second TIM message as the TIM message to monitor, wherein the second TIM message is a TIM message that is transmitted immediately prior to the final TIM message.

13 . The UE of claim 10 , wherein the one or more processors are further configured to transmit a PS_Poll frame to the AP, wherein the PS_Poll frame comprises a request to retrieve a buffered Downlink (DL) data for the UE.

14 . The UE of claim 13 , wherein the PS_Poll frame is transmitted on a DRX On duration that is configured by the DRX configuration.

15 . The UE of claim 10 , wherein the one or more processors are further configured to transmit an uplink data packet to the AP during a DRX active time, wherein the DRX active time includes at least one subframe that the UE monitors for a Downlink transmission from the base station.

16 . The UE of claim 10 , wherein the selected TIM message indicates whether the AP buffers downlink data for the UE.

17 . A user equipment (UE), comprising:
one or more processors configured to:
receive, from a base station, a DRX configuration;
determine a WLAN power saving configuration based on the DRX configuration,
wherein the WLAN power saving configuration comprises a listen interval; and
transmit, to an Access Point (AP), the WLAN power saving configuration.

18 . A user equipment (UE), comprising:
one or more processors configured to:
transmit, to a base station, a DRX configuration request, wherein the DRX configuration request comprises a DRX assistance report that is based on a WLAN power saving configuration;
receive, from the base station, a DRX configuration, wherein the DRX configuration is determined based on the DRX assistance report; and
configure at least one DRX cycle based on the DRX configuration.

19 . 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:
receiving, from a base station, at a user equipment (UE), a Discontinuous Reception (DRX) configuration; determining a WLAN listen interval that includes at least one Traffic Indication Map (TIM) period and at least one TIM transmission period; selecting, based on the DRX configuration , a TIM message to monitor within an associated TIM transmission period from the at least one TIM transmission period in the listen interval; determining a WLAN wakeup time that overlaps the associated TIM transmission period; and during the associated TIM transmission periods, receiving, from an Access Point (AP), the selected TIM message.

20 . 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:
receiving, from a base station, at a user equipment (UE), a DRX configura

Assignees

• Blackberry Ltd

Inventors

• Cai Zhijun
• Lepp James Randolph Winter
• Vutukuri Eswar

Classifications

• H04W52/0216 Primary

  using a pre-established activity schedule, e.g. traffic indication frame · CPC title

• H04W76/28 Primary

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

• H04W52/0235

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

• H04W84/12

  WLAN [Wireless Local Area Networks] · CPC title

• H04W76/048 Primary

  Electricity · mapped topic