Wake-up signal monitoring optimization
Methods and apparatus are described for adapting wake-up signal monitoring to optimize power saving performance. In one embodiment, a UE can be configured to selectively skip WUS monitoring based on a current UE context. In another embodiment, WUS/PDCCH monitoring and/or other UE procedure can be adapted based on a statistic related to the wake-up signals transmitted by the base station to the UE.
1. A method of wake-up signal monitoring implemented by a user equipment (UE) during a discontinuous reception (DRX) mode, the method comprising:
determining a statistical property of wake-up signals transmitted by the base station;
selectively monitoring a wake-up signal monitoring occasion preceding the on duration of the DRX cycle for a wake-up signal based on the statistical property of the wake-up signals transmitted by the base station;
waking during a corresponding on duration of the DRX cycle and monitoring the downlink control channel when monitoring of the WUS monitoring occasion is skipped;
wherein the statistical property comprises a wake-up signal reception rate; and
wherein selectively monitoring a wake-up signal monitoring occasion comprises selectively monitoring the wake-up signal monitoring occasions depending on the wake-up signal reception rate.
2. The method of claim 1 , further comprising monitoring a downlink control channel during a next on duration of the DRX cycle when a wake-up signal is detected during the wake-up signal monitoring occasion.
3. The method of claim 1 , wherein the wake-up signal reception rate comprises:
an average number of wake-up signal monitoring occasions between detection of consecutive wake-up signals; or
number of wake-up signals detected divided by a total number of wake-up signal monitoring occasions over a period of time; or
number of DRX cycles between transmission of a scheduling request by the user equipment and detection of a wake-up signal.
4. The method of claim 1 :
wherein the wake-up signal reception rate is traffic type specific; and
wherein the UE selectively monitors the wake-up signal monitoring occasion depending on the current traffic type and the reception rate for the current traffic type.
5. The method of claim 1 :
wherein the wake-up signal reception rate is specific for a DRX configuration; and
wherein the UE selectively monitors the wake-up signal monitoring occasion depending on the current DRX configuration and the reception rate for the current DRX configuration.
6. The method of claim 1 , wherein selectively monitoring the wake-up signal monitoring occasion further depends on a wake-up signal detection rate.
7. The method of claim 1 , wherein selectively monitoring the wake-up signal monitoring occasion comprises monitoring resources used for wake-up signal monitoring in an order determined based on the statistical property of the wake-up signal transmission.
8. The method of claim 7 , wherein the resource comprises:
a bandwidth part or configured control resource set (CORESET); or
a Transmit Configuration Indicator (TCI) state or beam.
9. The method of claim 7 :
wherein the statistical property of wake-up signal transmission is specific to a Transmit Configuration Indicator (TCI) state; and
wherein the UE monitors the resources used for the wake-up signal monitoring in an order depending on the current TCI state.
10. The method of claim 1 , further comprising:
determining power consumption or power saving resulting from a specific wake-up signal monitoring behavior; and
further adapting wake-up signal monitoring based on the power consumption or power saving associated with the wake-up signal monitoring behavior.
11. The method of claim 1 , further comprising adapting downlink control channel monitoring depending on the statistical property of the wake-up signals transmitted by the base station.
12. The method of claim 11 , wherein the adapting downlink control channel monitoring comprises setting an aggregation level for downlink control channel monitoring.
13. The method of claim 11 , wherein the preemptively adapting the user equipment to perform a procedure comprises preemptively selecting a downlink control channel search space.
14. The method of claim 1 , further comprising preemptively setting a parameter to perform the UE procedure depending on the statistical property of the wake-up signal transmission.
15. The method of claim 1 , further comprising configuring or adapting measurement reporting depending on the statistical property of the wake-up signal transmission.
16. The method of claim 1 , further comprising selecting one or more secondary cells for carrier aggregation depending on the statistical property of the wake-up signal transmission.
17. The method of claim 1 , further comprising:
preemptively adapting one or more of downlink control channel monitoring and measurement reporting based on the statistical property;
power consumption or power saving resulting attributable to the preemptive adaptation; and
modifying a preemptive adaptation based on the power consumption or power saving associated with the preemptive actions.
18. The method of claim 1 , wherein the statistical property of the wake-up signals further comprises at least one of a distribution of the wake-up signals on resources used for wake-up signal transmission, and a probability of the wake-up signals occurring on resources used for wake-up signal transmission.
19. A user equipment (UE) in a wireless communication network comprising:
communication circuitry for communicating with a wireless communication network;
processing circuitry operative to:
determine a statistical property of wake-up signals transmitted by the base station;
selectively monitoring a wake-up signal monitoring occasion preceding the on duration of the DRX cycle for a wake-up signal based on the statistical property of the wake-up signals transmitted by the base station; and
waking during a corresponding on duration of the DRX cycle and monitoring the downlink control channel when monitoring of the WUS monitoring occasion is skipped:
wherein the statistical property comprises a wake-up signal reception rate; and
wherein selectively monitoring a wake-up signal monitoring occasion comprises selectively monitoring the wake-up signal monitoring occasions depending on the wake-up signal reception rate.