Downlink control channel signaling for improving ue power consumption

Patent metadata

Field	Value
Publication number	US-2020037396-A1
Application number	US-201916520522-A
Country	US
Kind code	A1
Filing date	Jul 24, 2019
Priority date	Jul 24, 2018
Publication date	Jan 30, 2020
Grant date	—

Abstract

Described herein are methods and apparatus for implementing discontinuous reception (DRX) states in user equipments (UE) in order to conserve battery power. In particular, methods and apparatus for signaling the UE to transition between different DRX states using L1 signaling such as over the physical downlink control channel (PDCCH) are described.

First claim

1 . An apparatus for a user equipment (UE), the apparatus comprising:
memory and processing circuitry, wherein, the processing circuitry is to: when directed to do so by a next generation evolved Node B (gNB), operate in a discontinuous reception (DRX) mode according to an indicated DRX configuration while in a radio resource control (RRC) connected state, wherein a DRX cycle includes an Active state during which the UE monitors for downlink control information (DCI) for scheduling data transmission from the gNB via a physical downlink control channel (PDCCH) and a non-Active state during which the UE is allowed to not monitor for DCI for scheduling data transmission in order to conserve battery power; after receiving from the gNB a higher layer configuration signaling which triggers the UE to monitor for a wake-up signal in DRX mode, monitor for a wake-up signal (WUS) during the non-Active state at configurable monitoring occasions, wherein the WUS is sent from the gNB via the DCI in a PDCCH; and, after detecting the WUS, enter the Active state at least for a configurable duration to monitor for DCIs for scheduling data transmission.

2 . The apparatus of claim 1 wherein the processing circuitry is to receive the higher layer configuration signaling via RRC signaling.

3 . The apparatus of claim 1 wherein the processing circuitry is to detect the PDCCH carrying a WUS using a dedicated or configured radio network temporary identifier (RNTI).

4 . The apparatus of claim 1 wherein the processing circuitry is to monitor and detect the PDCCH carrying a WUS in a search space as configured and signaled by the gNB.

5 . The apparatus of claim 1 wherein the processing circuitry is to decode the PDCCH carrying a WUS at an aggregation level setting the number of control channel elements (CCEs) in the PDCCH as configured and signaled by the gNB.

6 . The apparatus of claim 1 wherein the processing circuitry is to monitor for WUS at one or more monitoring occasions that start at an offset before the Active state duration of the DRX cycle, the offset being configured and signaled by the gNB.

7 . The apparatus of claim 1 wherein the processing circuitry is to, when waking up after WUS is detected, wake up to be in Active state in a bandwidth part (BWP) indicated by the WUS.

8 . The apparatus of claim 1 wherein the processing circuitry is to detect a WUS by searching for a dedicated DCI format transmitted in a PDCCH.

9 . The apparatus of claim 1 wherein the processing circuitry is to monitor and detect the PDCCH carrying a WUS in a UE specific search space.

10 . An apparatus for a next generation evolved Node B (gNB), the apparatus comprising:
memory and processing circuitry, wherein, the processing circuitry is to: encode a command to be transmitted to a user equipment (UE) that directs the UE to operate in a discontinuous reception (DRX) mode according to an indicated DRX configuration while in a radio resource control (RRC) connected state, wherein a DRX cycle includes an Active state during which the UE monitors for downlink control information (DCI) for scheduling data transmission from the gNB via a physical downlink control channel (PDCCH) and a non-Active state during which the UE is allowed to not monitor for DCI for scheduling data transmission in order to conserve battery power; via higher layer configuration signaling, trigger the UE to monitor for a wake-up signal (WUS) during the non-Active state at configurable monitoring occasions, wherein the WUS is sent from the gNB via the DCI in a PDCCH; and, wherein the WUS commands the UE to enter the Active state at least for a configurable duration to monitor for DCIs for scheduling data transmission.

11 . The apparatus of claim 10 wherein the processing circuitry is to implement the higher layer configuration signaling via RRC signaling.

12 . The apparatus of claim 10 wherein the processing circuitry is to encode the PDCCH carrying a WUS using a dedicated or configured radio network temporary identifier (RNTI).

13 . The apparatus of claim 10 wherein the processing circuitry is to encode the PDCCH carrying a WUS in a configurable search space that is signaled to the UE.

14 . The apparatus of claim 10 wherein the processing circuitry is to encode the PDCCH carrying a WUS at a configurable aggregation level signaled to the UE that sets the number of control channel elements (CCEs) in the PDCCH.

15 . The apparatus of claim 10 wherein the processing circuitry is to configure and signal to the UE an offset, wherein the UE is to monitor for WUS at monitoring occasions that start at the offset before the Active state duration of the DRX cycle

16 . The apparatus of claim 10 wherein the processing circuitry is to encode the GTS with information commanding the UE to, when waking up after WUS is detected, wake up to be in Active state in a bandwidth part (BWP) indicated by the WUS.

17 . The apparatus of claim 10 wherein the processing circuitry is to encode a WUS using a dedicated DCI format in the PDCCH.

18 . A non-transitory computer-readable storage medium comprising instructions to cause processing circuitry of a user equipment (UE), upon execution of the instructions by the processing circuitry, to:
when directed to do so by a next generation evolved Node B (gNB), operate in a discontinuous reception (DRX) mode according to an indicated DRX configuration while in a radio resource control (RRC) connected state, % herein a DRX cycle includes an Active state during which the UE monitors for downlink control information (DCI) for scheduling data transmission from the gNB via a physical downlink control channel (PDCCH) and a non-Active state during which the UE is allowed to not monitor for DCI for scheduling data transmission in order to conserve battery power; after receiving from the gNB a higher layer configuration signaling which triggers the UE to monitor for a wake-up signal in DRX mode, monitor for a wake-up signal (WUS) during the non-Active state at configurable monitoring occasions, wherein the WUS is sent from the gNB via the DCI in a PDCCH; and, after detecting the WUS, enter the Active state at least for a configurable duration to monitor for DCIs for scheduling data transmission.

19 . The medium of claim 18 further comprising instructions to cause processing circuitry of a user equipment (UE), upon execution of the instructions by the processing circuitry, to receive the higher layer configuration signaling via RRC signaling.

20 . The medium of claim 16 further comprising instructions to detect the PDCCH carrying a WUS using a dedicated or configured radio network temporary identifier (RNTI).

Assignees

• Islam Toufiqul
• He Hong
• Ye Qiaoyang
• Miao Honglei
• Xiong Gang

Inventors

• Islam Toufiqul
• He Hong
• Ye Qiaoyang
• Miao Honglei
• Xiong Gang

Classifications

• H04W76/28

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

• H04W52/0229 Primary

  where the received signal is a wanted signal · CPC title

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W24/08

  Testing, {supervising or monitoring} using real traffic · CPC title

• H04W88/06 Primary

  adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals · CPC title