Power saving mechanisms in NR
Methods, systems, and devices may assist in power saving in new radio. For example, enable power savings during the connected mode discontinuous reception cycle of the RRC_CONNECTED state of a user equipment.
1 . A wireless transmit/receive unit (WTRU) comprising a processor configured to:
monitor for a power savings signal in a monitoring occasion prior to an OnDuration of a first discontinuous reception cycle; and
monitor for physical downlink control channel (PDCCH) transmissions during the OnDuration of the first discontinuous reception cycle based on determining that the power savings signal was not detected during the monitoring occasion prior to the OnDuration of the first discontinuous reception cycle.
2 . The WTRU of claim 1 , wherein the processor is configured to:
receive a second power savings signal during a monitoring occasion prior to an OnDuration of a second discontinuous reception cycle.
3 . The WTRU of claim 2 , wherein the processor is configured to:
determine that the second power savings signal corresponds to a wake-up signal; and
monitor for PDCCH transmissions during the OnDuration of the second discontinuous reception cycle based on determining that the second power savings signal corresponds to the wake-up signal.
4 . The WTRU of claim 2 , wherein the processor is configured to:
determine that the second power savings signal corresponds to a go-to-sleep signal; and
refrain from monitoring for PDCCH transmissions during the OnDuration of the second discontinuous reception cycle based on determining that the second power savings signal corresponds to the go-to-sleep signal.
5 . The WTRU of claim 1 , wherein the power savings signal is comprised in a PDCCH transmission.
6 . The WTRU of claim 5 , wherein the PDCCH transmission comprising the power savings signal is associated with a power savings radio network temporary identifier and a power savings downlink control information (DCI) format.
7 . The WTRU of claim 6 , wherein the power savings radio network temporary identifier comprises a micro sleep radio network temporary identifier (MS-RNTI).
8 . The WTRU of claim 6 , wherein the PDCCH transmission comprises the power savings signal is a multicast message receivable by multiple WTRUs.
9 . The WTRU of claim 1 , wherein the processor is configured to:
receive a radio resource control (RRC) message, the RRC message comprising configuration information for receiving the power savings signal, the configuration information indicating a location for monitoring for the power saving signal and aggregation level information for monitoring for the power savings signal.
10 . The WTRU of claim 9 , wherein the location for monitoring for the power saving signal corresponds to a control resource set (CORESET) and a common search space.
11 . A method implemented by a wireless transmit/receive unit (WTRU), the method comprising:
monitoring for a power savings signal in a monitoring occasion prior to an OnDuration of a first discontinuous reception cycle; and
monitoring for physical downlink control channel (PDCCH) transmissions during the OnDuration of the first discontinuous reception cycle based on determining that the power savings signal was not detected during the monitoring occasion prior to the OnDuration of the first discontinuous reception cycle.
12 . The method of claim 11 , further comprising:
receiving a second power savings signal during a monitoring occasion prior to an OnDuration of a second discontinuous reception cycle.
13 . The method of claim 12 , further comprising:
determining that the second power savings signal corresponds to a wake-up signal; and
monitoring for PDCCH transmissions during the OnDuration of the second discontinuous reception cycle based on determining that the second power savings signal corresponds to the wake-up signal.
14 . The method of claim 12 , further comprising:
determining that the second power savings signal corresponds to a go-to-sleep signal; and
refraining from monitoring for PDCCH transmissions during the OnDuration of the second discontinuous reception cycle based on determining that the second power savings signal corresponds to the go-to-sleep signal.
15 . The method of claim 11 , wherein the power savings signal is comprised in a PDCCH transmission.
16 . The method of claim 15 , wherein the PDCCH transmission comprises the power savings signal is associated with a power savings radio network temporary identifier and a power savings downlink control information (DCI) format.
17 . The method of claim 16 , wherein the power savings radio network temporary identifier comprises a micro sleep radio network temporary identifier (MS-RNTI).
18 . The method of claim 16 , wherein the PDCCH transmission comprises the power savings signal is a multicast message receivable by multiple WTRUs.
19 . The method of claim 11 , further comprising:
receiving a radio resource control (RRC) message, the RRC message comprising configuration information for receiving the power savings signal, the configuration information indicating a location for monitoring for the power saving signal and aggregation level information for monitoring for the power savings signal, wherein the location for monitoring for the power saving signal corresponds to a control resource set (CORESET) and a common search space.
20 . An apparatus that performs wireless communication, the apparatus comprising:
a processor; and
a memory coupled with the processor, the memory comprising executable instructions stored thereon that when executed by the processor cause the processor to effectuate operations comprising:
monitoring for a power savings signal in a monitoring occasion prior to an OnDuration of a discontinuous reception cycle on a first cell;
monitoring for physical downlink control channel (PDCCH) transmissions during the OnDuration of the discontinuous reception cycle on condition that the power savings signal is not detected;
receiving an indication to sleep during active time of the discontinuous reception cycle; and
switching to a lower power state of operation until a next monitoring occasion of the power savings signal.