Discontinuous reception mode with multiple-stage wake-up

Patent metadata

Field	Value
Publication number	US-9872252-B1
Application number	US-201715459758-A
Country	US
Kind code	B1
Filing date	Mar 15, 2017
Priority date	Sep 30, 2016
Publication date	Jan 16, 2018
Grant date	Jan 16, 2018

Abstract

Systems and method of embodiments herein operate to conserve battery power of user equipment (UE). Embodiments determine whether waking up a UE receiver would be beneficial and based on the determination, the UE either wakes up the receiver or returns to sleep. Embodiments determine whether to wake up the receiver by performing pre-wake up (PWU) operation which either wakes up the receiver in a low power mode or wakes up the UE's wake up receiver. It may be determined whether a wake up (WU) signal is received during a PWU stage. If a WU signal is received during the PWU stage the UE may perform a full wake up of the receiver. If a WU signal is not received the UE may return to idle mode. In embodiments, WU (Wake Up) DRX cycles are supplemented with a Full DRX (Discontinuous Reception) cycle.

First claim

What is claimed is:

1. A method for providing power-conserving operation via a multiple stage wake up (WU) process of user equipment (UE), the method comprising:
transitioning one or more receivers of the UE from a low power sleep state to a communication ready state at a second stage of the multiple stage WU process based upon control signal monitoring by the UE in a pre-wake up (PWU) state of a first stage of the multiple stage WU process when it is determined that the one or more receivers of the UE are to be transitioned to the communication ready state at the first stage of the WU process, wherein the communication ready state provides a connection between the UE and another station in which the UE is configured to receive and transmit data communications, and wherein UE operation in the PWU state provides the control signal monitoring at a power level intermediate to UE operations in the low power sleep state and the communication ready state and
ending a cycle of the multiple stage WU process without performing the second stage of the WU process to transition the one or more receivers to the communication ready state when it is determined that the one or more receivers are not to be transitioned to the communication ready state at the first stage of the multiple stage WU process.

2. The method of claim 1 , wherein the first stage of the WU process controls the one or more receivers to operate in a low power receive mode to detect a wake up control signal, and wherein the second stage of the WU process controls transitioning the one or more receivers to the communication ready state.

3. The method of claim 1 , wherein the first stage of the WU process controls a wake up receiver of the UE to detect a wake up control signal, and wherein the second stage of the WU process controls transitioning the one or more receivers to the communication ready state.

4. The method of claim 1 , further comprising:
monitoring for a wake up control signal during the first stage of the WU process, wherein the determination regarding transitioning the one or more receivers of the UE to the communication ready operation is based at least in part on detecting the wake up control signal.

5. The method of claim 4 , wherein the wake up control signal comprises a control signal multiplexed with one or more signal for another UE.

6. The method of claim 4 , wherein the wake up control signal comprises a waveform to be processed based on non-coherent detection by a receiver of the UE.

7. The method of claim 4 , wherein the wake up control signal comprises information that indicates whether additional data is expected to be transmitted to the UE.

8. The method of claim 7 , wherein the wake up control signal information comprises information selected from the group consisting of control channel assignment data, data channel subband assignment, and bandwidth information.

9. The method of claim 4 , further comprising:
instituting a gap between an end of a duration of the first stage of the WU process and initiation of a duration where the UE is operable to receive and transmit when the wakeup control signal is detected.

10. The method of claim 9 , wherein the gap comprises a number of subframes selected to enable processing of one or more control signals received in the duration of the first stage of the WU process.

11. The method of claim 9 , wherein the gap comprises a number of subframes selected to facilitate make-ready of the one or more receivers for the communication ready operation.

12. The method of claim 1 , further comprising:
forcing the one or more receivers to transition to the communication ready state from time to time outside of control of a wake up discontinuous reception (WU DRX) cycle comprising the first and second stages of the WU process.

13. The method of claim 12 , further comprising:
performing multiple instances of the WU DRX cycle in a full discontinuous reception (Full DRX) cycle including the multiple instances of the WU DRX cycle and a cycle forcing the one or more receivers to transition to the communication ready operation outside of control of the WU DRX cycles.

14. A non-transitory computer-readable medium having program code recorded thereon for providing power-conserving operation via a multiple stage wake up (WU) process of user equipment (UE), wherein when the program code is executed by one or more computers causes the one or more computers to:
transition one or more receivers of the UE from a low power sleep state to a communication ready state at a second stage of the multiple stage WU process based upon control signal monitoring by the UE in a pre-wake up (PWU) state of a first stage of the multiple stage WU process when it is determined that the one or more receivers of the UE are to be transitioned to the communication ready state at the first stage of the WU process, wherein the communication ready state provides a connection between the UE and another station in which the UE is configured to receive and transmit data communications, and wherein the UE operation in the PWU state provides the control signal monitoring at a power level intermediate to UE operations in the low power sleep state and the communication ready state; and
end a cycle of the multiple stage WU process without performing the second stage of the WU process to transition the one or more receivers to the communication ready state when it is determined that the one or more receivers are not to be transitioned to the communication ready state at the first stage of the multiple stage WU process.

15. The non-transitory computer-readable medium of claim 14 , wherein the first stage of the WU controls the one or more receivers to operate in a low power receive mode to detect a wake up control signal, and wherein the second stage of the WU process controls transitioning the one or more receivers to the communication ready state.

16. The non-transitory computer-readable medium of claim 14 , wherein the first stage of the WU process controls a wake up receiver of the UE to detect a wake up control signal, and wherein the second stage of the WU process controls transitioning the one or more receivers to the communication ready state.

17. The non-transitory computer-readable medium of claim 14 , wherein the program code further comprises program code for causing the one or more computers to:
monitor for a wake up control signal during the first stage of the WU process, wherein the determination regarding transitioning the one or more receivers of the UE to the communication ready operation is based at least in part on detecting the wake up control signal.

18. The non-transitory computer-readable medium of claim 17 , wherein the wake up control signal comprises a waveform to be processed based on non-coherent detection by a receiver of the UE.

19. The non-transitory computer-readable medium of claim 17 , wherein the program code further comprises program code for causing the one or more computers to:
institute a gap between an end of a duration of the first stage of the WU process and initiation of a duration where the UE is operable to receive and transmit when the wakeup control signal is detected.

20. The non-transitory computer-readable medium of claim 17 , wherein the program code further comprises program code for causing the one or more computers to:
force the one or more receivers to transition to the communication ready state from time to time outside of control of a wake up discontinuous reception (WU DRX) cycle comprising the firs

Assignees

• Qualcomm Inc

Inventors

• Ang Peter Pui Lok
• Aminzadeh Gohari Amir
• Gorokhov Alexei Yurievitch
• Challa Raghu Narayan
• Ji Tingfang
• Mukkavilli Krishna Kiran
• Agarwal Ravi
• Soriaga Joseph Binamira
• Xu Hao

Classifications

• H04W72/20

  Control channels or signalling for resource management · CPC title

• H04W76/28

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

• H04W52/0248

  dependent on the time of the day, e.g. according to expected transmission activity · CPC title

• H04W52/0235 Primary

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

• H04W52/0216 Primary

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