EP-4742778-A2 - METHODS AND APPARATUS TO FACILITATE WAKE-UP SIGNALING DURING DISCONTINUOUS RECEPTION

Abstract

Apparatus, methods, and computer-readable media for providing improved power efficiency during DRX wake-up are disclosed. An example method of wireless communication at a UE includes receiving a WUS from a base station while performing a DRX cycle, the WUS indicating data for transmission to the UE. The example method also includes at least one receiving a downlink reference signal or transmitting an uplink reference signal based on the WUS and prior to reception of the data, the uplink reference signal transmitted or the downlink reference signal received during an on-duration of the DRX cycle and in response to receiving the WUS. The example method also includes sending a CSI report to the base station based on the WUS and prior to the receiving of the data. The example method also includes receiving the data following the respective receiving or transmitting of the downlink reference signal or uplink reference signal.

Inventors

• ANG, PETER PUI LOK
• LEE, HEECHOON
• XU, HUILIN
• JI, TINGFANG
• CHEN, WANSHI
• LUO, TAO
• GOROKHOV, ALEXEI YURIEVITCH
• KHANDEKAR, AAMOD
• MOHSENI, JAFAR
• NAM, WOOSEOK
• MANOLAKOS, Alexandros

Assignees

• QUALCOMM Incorporated

Dates

Publication Date

20260513

Application Date

20191224

Claims (14)

1. A method of wireless communication at a User Equipment, UE, comprising: monitoring for a wake-up signal, WUS, from a base station on resources associated with multiple control resource sets, CORESETs, including monitoring for the WUS while performing a discontinuous reception, DRX, cycle, wherein the monitoring for the WUS includes monitoring for a first WUS in a first CORESET and monitor for a second WUS in a second CORESET; receiving, from the base station, the WUS in at least one of the multiple CORESETs during a wake-up signal occasion prior to an on-duration of the DRX cycle; and transmitting a sounding reference signal, SRS, based on the WUS received in the at least one of the multiple CORESETs, wherein the WUS causes the UE to enter an awake state during the on-duration of the DRX cycle and the SRS is transmitted during the on-duration of the DRX cycle and in an active bandwidth part, BWP.
2. The method of claim 1, wherein the WUS is comprised in at least one of a control channel or another reference signal.
3. The method of claim 2, further comprising, during the on-duration, receiving a trigger to receive a downlink reference signal or to transmit the SRS within the same slot as the trigger.
4. The method of claim 2, further comprising receiving a Periodic Tracking Reference Signal, P-TRS, during the wake-up signal occasion prior to the on-duration, and wherein the WUS received during the wake-up signal occasion is comprised in the control channel.
5. The method of claim 2, wherein the WUS received during the wake-up signal occasion prior to the on-duration comprises a Periodic Tracking Reference Signal, P-TRS.
6. The method of claim 2, further comprising receiving a Periodic Channel State Information Reference Signal, P-CSI-RS, during the wake-up signal occasion prior to the on-duration.
7. The method of claim 6, wherein the P-CSI-RS is received over a wide bandwidth.
8. The method of claim 6, further comprising receiving the WUS in the P-CSI-RS or received in a Physical Downlink Control Channel, PDCCH.
9. The method of claim 8, further comprising: receiving a Periodic Tracking Reference Signal, P-TRS, during the wake-up signal occasion prior to the on-duration.
10. The method of claim 1, wherein a location of an expected downlink reference signal in at least one of time or frequency or a scrambling sequence of the expected downlink reference signal conveys additional information to the UE.
11. The method of claim 10, wherein the additional information comprises instructions to perform a bandwidth part, BWP, configuration switch.
12. The method of claim 1, further comprising transmitting the SRS to the base station prior to the receiving of the data, and wherein the receiving of the data is based on a channel quality associated with the SRS.
13. A User Equipment, UE, comprising: means for monitoring for a wake-up signal, WUS, from a base station on resources associated with multiple control resource sets, CORESETs, including monitoring for the WUS while performing a discontinuous reception, DRX, cycle, wherein the monitoring for the WUS includes monitoring for a first WUS in a first CORESET and monitor for a second WUS in a second CORESET; means for receiving, from the base station, the WUS in at least one of the multiple CORESETs during a wake-up signal occasion prior to an on-duration of the DRX cycle; and means for transmitting a sounding reference signal, SRS, based on the WUS received in the at least one of the multiple CORESETs, wherein the WUS causes the UE to enter an awake state during the on-duration of the DRX cycle and the SRS is transmitted during the on-duration of the DRX cycle and in an active bandwidth part, BWP.
14. The UE of claim 13, further comprising means for performing a method according to any of claims 2 to 12.

Description

CROSS REFERENCE TO RELATED APPLICATION(S) This application claims the benefit of U.S. Provisional Patent Application Serial No. 62/788,734, entitled "METHODS AND APPARATUS TO FACILITATE WAKE-UP SIGNALING DURING DISCONTINUOUS RECEPTION" and filed on January 4, 2019, and U.S. Patent Application No. 16/726,149, entitled "METHODS AND APPARATUS TO FACILITATE WAKE-UP SIGNALING DURING DISCONTINUOUS RECEPTION" and filed on December 23, 2019, which are expressly incorporated by reference herein in their entirety. BACKGROUND Technical Field The present disclosure relates generally to communication systems, and more particularly, to wireless communication including wake-up signals. Introduction Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems. These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level. An example telecommunication standard is 5G New Radio (NR). 5G/NR is part of a continuous mobile broadband evolution promulgated by Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with Internet of Things (IoT)), and other requirements. 5G/NR includes services associated with enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra reliable low latency communications (URLLC). Some aspects of 5G/NR may be based on the 4G Long Term Evolution (LTE) standard. There exists a need for further improvements in 5G/NR technology. These improvements may also be applicable to other multi-access technologies and the telecommunication standards that employ these technologies. SUMMARY The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later. Discontinuous reception (DRX) is a cycle in which a User Equipment (UE) may operate in to save power. To achieve DRX, the network and the UE may agree to one or more scheduled durations during which the UE wakes up to look for messages. When operating in accordance with a DRX cycle, a UE may wake-up (e.g., enter an awake state) and actively communicate with a network device, such as a base station, during an on-duration of the DRX cycle, and may enter a sleep state during an off-duration of the DRX cycle. That is, a DRX cycle includes an on-duration during which the UE may monitor for control information (e.g., on a physical downlink shared channel (PDCCH)) and an off-duration during which the UE may power down radio components. In some examples, rather than scheduling when the UE is to implement the on-duration of the DRX cycle, the network device may transit a wake-up signal (WUS) to the UE to transition the UE to the on-duration. The present disclosure provides unique techniques for improving power efficiency of the DRX cycle. For example, disclosed techniques employ a WUS in relation to other reference signals, such as tracking reference signals (TRSs), channel state information reference signals (CSI-RSs), and/or sounding reference signals (SRSs), to assist in measurement and/or feedback of channel state information. Additional or alternate aspects include implementing a wake-up signal occasion to indicate whether there is data scheduled for the UE in the on-duration of the DRX cycle related to a CSI trigger (e.g., an aperiodic CSI (A-CSI) trigger), an SRS trigger, and/or information related to an active bandwidth part (BWP) of the on-duration of the DRX cycle. In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided for facilitating wireless communication at a UE. An example apparatus receives a WUS from a base station while performing a DRX cycle, the WUS indicating data for transmission to the UE. The example apparatus also at least one of receives a downlink reference s