Method and apparatus for operating low-power wake-up receiver (LP-WUR)
Some aspects of this disclosure relate to apparatuses and methods for implementing one or more low-power wake-up receivers (LP-WUR) at the UE and for implementing mechanisms for improving receiver sensitivity loss for the LP-WUR. According to some aspects, apparatuses and methods are provided to improve the receiver sensitivity loss for the LP-WUR using time domain coverage improvement, power domain coverage improvement, spatial domain coverage improvement, and/or frequency domain coverage improvement.
1 . A user equipment (UE), comprising:
a transceiver configured to wirelessly communicate with a base station;
a low-power receiver configured to wirelessly communicate with the base station; and
a processor communicatively coupled to the transceiver and the low-power receiver, and configured to:
receive, using the low-power receiver, a low-power wake-up signal (LP-WUS), wherein the LP-WUS comprises a plurality of symbols aggregated in a time domain and wherein the plurality of symbols comprise one symbol repeated in the time domain;
determine whether the LP-WUS comprises a downlink (DL) control channel monitoring indicator; and
in response to the LP-WUS comprising the DL control channel monitoring indicator, trigger the transceiver to transition to an awake state to monitor a DL control channel.
2 . The UE of claim 1 , wherein the plurality of symbols are aggregated in the time domain with their corresponding cyclic prefix.
3 . The UE of claim 1 , wherein the plurality of symbols are aggregated in the time domain without their corresponding cyclic prefix.
4 . The UE of claim 1 , wherein the plurality of symbols comprise a plurality of orthogonal frequency-division multiplexing (OFDM) symbols with a subcarrier spacing (SCS) smaller than 15 kHz.
5 . The UE of claim 1 , wherein the processor is further configured to:
use the LP-WUS for radio resource management (RRM) measurement; and
perform the RRM measurement based on the LP-WUS.
6 . The UE of claim 1 , wherein the processor is further configured to:
transmit, using the transceiver, a message to the base station indicating a desired transmission power boost for the LP-WUS; and
receive, using the low-power receiver, a second LP-WUS from the base station, the second LP-WUS having an increased transmission power relative to that of the LP-WUS and based on the desired transmission power boost for the LP-WUS.
7 . The UE of claim 6 , wherein the desired transmission power boost comprises:
an absolute transmission power value,
an absolute transmission power offset value,
an absolute transmission power adjustment, or
an accumulative transmission power adjustment.
8 . The UE of claim 1 , wherein the processor is further configured to receive an uplink (UL) transmission power control for a UL transmission from the UE to the base station, wherein the UL transmission power control indicates a transmission power boost.
9 . The UE of claim 8 , wherein the UL transmission power control is based on a loss parameter associated with the transmission power boost.
10 . The UE of claim 1 , wherein the processor is configured to receive the LP-WUS using a plurality of spatial domain filters over a frequency domain resource or over a time domain resource.
11 . The UE of claim 1 , wherein the plurality of spatial domain filters are explicitly configured by the base station or the plurality of spatial domain filters are implicitly configured by the base station.
12 . A method performed by a user equipment (UE), the method comprising:
receiving, using a low-power receiver of the UE, a low-power wake-up signal (LP-WUS) from a base station, wherein the LP-WUS comprises a plurality of symbols aggregated in a time domain and wherein the plurality of symbols comprise one symbol repeated in the time domain;
determining whether the LP-WUS comprises a downlink (DL) control channel monitoring indicator; and
in response to the LP-WUS comprising the DL control channel monitoring indicator, triggering a transceiver of the UE to transition to an awake state to monitor a DL control channel.
13 . The method of claim 12 , wherein the plurality of symbols are aggregated in the time domain with their corresponding cyclic prefix.
14 . The method of claim 12 , wherein the plurality of symbols are aggregated in the time domain without their corresponding cyclic prefix.
15 . The method of claim 12 , wherein the plurality of symbols comprise a plurality of orthogonal frequency-division multiplexing (OFDM) symbols with a subcarrier spacing (SCS) smaller than 15 kHz.
16 . The method of claim 12 , further comprising:
performing RRM measurement based on the LP-WUS.
17 . A non-transitory computer-readable medium storing instructions that when executed by a processor of a user equipment (UE) cause the UE to perform operations comprising:
receiving, using a low-power receiver of the UE, a low-power wake-up signal (LP-WUS) from a base station, wherein the LP-WUS comprises a plurality of symbols aggregated in a time domain and wherein the plurality of symbols comprise one symbol repeated in the time domain;
determining whether the LP-WUS comprises a downlink (DL) control channel monitoring indicator; and
in response to the LP-WUS comprising the DL control channel monitoring indicator, triggering a transceiver of the UE to transition to an awake state to monitor a DL control channel.
18 . The non-transitory computer-readable medium of claim 17 , wherein the operations further comprising:
performing RRM measurement based on the LP-WUS.
19 . The non-transitory computer-readable medium of claim 17 , wherein the operations further comprising:
transmitting, using the transceiver, a message to the base station indicating a desired transmission power boost for the LP-WUS; and
receiving, using the low-power receiver, a second LP-WUS from the base station, the second LP-WUS having an increased transmission power relative to that of the LP-WUS and based on the desired transmission power boost for the LP-WUS.
20 . The non-transitory computer-readable medium of claim 17 , wherein the operations further comprising receiving an uplink (UL) transmission power control for a UL transmission from the UE to the base station, wherein the UL transmission power control indicates a transmission power boost.