Control of power saving using layer-1 signaling
Techniques for fast adaptation of PDCCH monitoring by a UE via L1 signaling in order to reduce power consumption by the UE are disclosed. A base station sends first configuration information to a user equipment (UE) via higher layer signaling (e.g. RRC) to configure downlink control channel monitoring by the UE. Thereafter, the base station may send downlink control information to the UE via L1 signaling to adapt the PDCCH monitoring by the 6 UE. The downlink control information may temporarily override or modify the parameters for PDCCH monitoring set by higher layers. The downlink control information may be send in an existing downlink control message or in a new downlink control message.
1. A method implemented by a user equipment (UE) in a serving cell of a wireless communication network, the method comprising:
receiving first configuration information via Radio Resource Control (RRC) signaling from a base station or network node for configuring downlink control channel monitoring by the UE;
monitoring the downlink control channel in accordance with the first configuration information; and
receiving downlink control information from the base station via layer1 signaling, wherein the downlink control information is associated with a dedicated, power-saving Radio Network Temporary Identifier (RNTI) configured via RRC signaling;
wherein the power-saving RNTI comprises a group RNTI targeting a group of UEs and wherein the downlink control information further includes a bitmap indicating which UEs in the group UEs should adapt the downlink control channel monitoring based on the downlink control information; and
adapting the downlink control channel monitoring responsive to the downlink control information.
2. The method of claim 1 , wherein the first configuration information comprises one or more search spaces configured for the UE, and a first monitoring schedule for monitoring the configured search spaces.
3. The method of claim 2 , wherein adapting the downlink control channel monitoring comprises adapting control channel monitoring for all the configured search spaces.
4. The method of claim 2 , wherein adapting the downlink control channel monitoring comprises adapting control channel monitoring for less than all the configured search spaces.
5. The method of claim 2 , wherein adapting the downlink control channel monitoring modifies or overrides the first monitoring schedule for at least one configured search space.
6. The method of claim 1 , wherein the UE is configured for discontinuous reception (DRX); and wherein the first monitoring schedule is applied during an on duration of a DRX cycle, while an inactivity timer is active, or both.
7. The method of claim 1 , wherein the UE is configured for discontinuous reception; and wherein the downlink control information alters or adjusts an inactivity timer used by the UE for discontinuous reception.
8. The method of claim 1 , wherein receiving downlink control information from the base station or network node via layer1 signaling comprises receiving the downlink control information in a scheduling message that also schedules a data transmission to or from the UE.
9. The method of claim 8 , wherein the UE adapts the downlink control channel monitoring responsive to downlink control information only if feedback for scheduled data transmission is a positive acknowledgement.
10. The method of claim 1 , wherein receiving downlink control information from the base station or network node via layer1 signaling comprises receiving the downlink control information in a dedicated control message for adapting downlink control channel monitoring.
11. The method of claim 10 , further comprising the UE sending an acknowledgement in response to the dedicated control message for adapting downlink control channel monitoring.
12. A method implemented by a base station in a wireless communication network, the method comprising:
sending first configuration information to a user equipment (UE) via Radio Resource Control (RRC) signaling to configure downlink control channel monitoring by the UE; and
sending downlink control information to the UE via layer1 signaling to adapt the downlink control channel monitoring by the UE, wherein the downlink control information is associated with a dedicated, power-saving Radio Network Temporary Identifier (RNTI) configured via RRC signaling;
wherein the power-saving RNTI comprises a group RNTI targeting a group of UEs and wherein the downlink control information further includes a bitmap indicating which UEs in the group UEs should adapt the downlink control channel monitoring based on the downlink control information.
13. The method of claim 12 , wherein the first configuration information comprises one or more search spaces configured for the UE, and a first monitoring schedule for monitoring the configured search spaces.
14. The method of claim 13 , wherein the downlink control information adapts control channel monitoring for all the configured search spaces.
15. The method of claim 13 , wherein the downlink control information adapts control channel monitoring for less than all the configured search spaces.
16. The method of claim 13 , wherein the downlink control information modifies or overrides the first monitoring schedule for at least one configured search space.
17. The method of claim 12 , wherein the UE is configured for discontinuous reception (DRX); and wherein the first monitoring schedule is applied during an on duration of a DRX cycle, while an inactivity timer is active, or both.
18. The method of claim 12 , wherein the UE is configured for discontinuous reception; and wherein the downlink control information alters or adjusts an inactivity timer used by the UE for discontinuous reception.
19. The method of claim 12 , wherein sending downlink control information to the UE via layer1 signaling comprises sending the downlink control information in a scheduling message that also schedules a data transmission to or from the UE.
20. The method of claim 12 , wherein sending downlink control information to the UE via layer1 signaling comprises sending the downlink control information in a dedicated control message for adapting downlink control channel monitoring.
21. The method of claim 20 , further comprising the base station receiving an acknowledgement in response to the dedicated control message for adapting downlink control channel monitoring.
22. A user equipment in a wireless communication network, the user equipment comprising:
an interface circuit configured for communication with one or more serving cells the wireless communication network; and
a processing circuit configured to:
receive first configuration information via Radio Resource Control (RRC) signaling from a base station or network node for configuring downlink control channel monitoring by the UE;
monitor the downlink control channel in accordance with the first configuration information; and
receive downlink control information from the base station via layer1 signaling, wherein the downlink control information is associated with a dedicated, power-saving Radio Network Temporary Identifier (RNTI) configured via RRC signaling;
wherein the power-saving RNTI comprises a group RNTI targeting a group of UEs and wherein the downlink control information further includes a bitmap indicating which UEs in the group UEs should adapt the downlink control channel monitoring based on the downlink control information; and
adapt the downlink control channel monitoring responsive to the downlink control information from the base station.
23. A base station in a serving cell of a wireless communication network, the base station comprising:
an interface circuit configured for communication with one or more serving cells the wireless communication network; and
a processing circuit configured to:
send first configuration information to a user equipment (UE) via Radio Resource Control (RRC) signaling to configure downlink control channel monitoring by the UE; and
send downlink control information to the UE via layer1 signaling to adapt the downlink control channel monitoring by the UE, wherein the downlink control information is associated with a dedicated, power-saving Radio Network Temporary Identifier (RNTI) configured via RRC signaling;
wherein the power-saving RNTI comprises a group RNTI targeting a group of UEs and wherein the downlink control information further includes a bitmap indicating which UEs in the group UEs should adapt the downlink control channel monitoring based on the downlink control information.