Systems and methods of triggering active mode UE power saving
Embodiments herein describe systems, apparatuses, and methods for adapting physical downlink control channel (PDCCH) monitoring behaviors. In some embodiments, a network node and a UE use search space set group switching to change PDCCH monitoring behavior. In some embodiments, a network node and a UE use PDCCH skipping to change PDCCH monitoring behavior. The PDCCH monitoring behavior may be indicated in a downlink control indicator (DCI).
1. A method for a UE, the method comprising:
receiving a scheduling downlink control information (DCI) message, the DCI message including a skipping indication;
determining a time to apply skipping for physical downlink control channel (PDCCH) monitoring as a result of the skipping indication; and
applying the skipping for the PDCCH for a preconfigured number of slots at the determined time, wherein for downlink communication, the skipping is applied based on an acknowledgement (ACK) message or a negative-acknowledgement (NACK), wherein when the ACK message is transmitted, the skipping is applied after the ACK, and when the NACK message is transmitted, the skipping is applied after a drx-HARQRTTTimerDL.
2. The method of claim 1 , wherein the skipping is applied after the scheduling DCI is received and processed.
3. The method of claim 1 , wherein for uplink communication, the skipping is applied when drx-HARQRTTTimerUL expires.
4. The method of claim 1 , wherein for uplink communication, the skipping is applied right after a PSUCH transmission finishes.
5. The method of claim 1 , further comprising monitoring a drx-retransmissionTimerUL, and wherein the skipping is applied after the drx-retransmissionTimerUL expires.
6. The method of claim 1 , further comprising:
waking after skipping a preconfigured number of slots;
monitoring the PDCCH for a period of time; and
if no scheduling DCI is received, skipping another pre-configured number of slots.
7. The method of claim 1 , further comprising receiving a non-schedule DCI comprising a skip indication field indicating whether the UE should apply PDCCH monitoring skipping for another pre-configured number of slots.
8. A method for a network node, the method comprising:
configuring a scheduling downlink control information (DCI) message, the DCI message including a skipping indication;
transmitting the scheduling DCI to a UE;
determining a time that the UE will apply skipping for physical downlink control channel (PDCCH) monitoring as a result of the skipping indication;
limiting PDCCH transmission for a preconfigured number of slots at the determined time; and
reducing a size of a next scheduling DCI based on which UEs are to be monitoring PDCCH according to the non-scheduling DCI.
9. The method of claim 8 , further comprising sending a non-scheduling DCI comprising a skip indication field indicating whether the UE should apply PDCCH monitoring skipping for another pre-configured number of slots.
10. The method of claim 9 , wherein the non-scheduling DCI is UE specific.
11. The method of claim 9 , wherein the non-scheduling DCI is group based.
12. A user equipment (UE) comprising:
a baseband processing unit; and
a memory storing instructions that when executed by the baseband processing unit cause the UE to:
process a downlink control information (DCI);
determine a PDCCH monitoring behavior indicated by the DCI;
determine when to apply the PDCCH monitoring behavior; and
apply the PDCCH monitoring behavior, wherein for uplink communication, the PDCCH monitoring behavior indicated by the DCI is applied when drx-HARQRTTTimerUL expires.
13. The UE of claim 12 , wherein the DCI comprises a skipping indicator to cause the PDCCH monitoring behavior to apply PDCCH monitoring skipping.
14. The UE of claim 12 , wherein the DCI comprises a PDCCH monitor pattern indication to cause a search space or coreset change.
15. The UE of claim 14 , for downlink communication, the PDCCH monitor pattern is applied after one of DCI processing, drx-HARQRTTtimerDL expiring, or after ACK message.