Methods and apparatuses for power saving in discontinuous reception
Embodiments of the present application relate to methods and apparatuses for discontinuous reception (DRX). According to an embodiment of the present application, a method may include: receiving configuration information for a plurality of search space sets (SSSs); in the case that one or more SSSs of the plurality of SSSs are associated with at least one SSS group (SSSG), determining at least one SSS from each SSSG; in the case that the plurality of SSSs include a set of SSSs outside any SSSG, determining at least one SSS from the set of SSSs; and detecting downlink control information (DCI) in a determined SSS, wherein the DCI includes a field indicating a power saving operation for physical downlink control channel (PDCCH) monitoring. Embodiments of the present application can efficiently indicate a power saving operation for PDCCH monitoring during the DRX active time.
1 . A method, comprising:
receiving configuration information for search space sets (SSSs);
when one or more of the SSSs are associated with at least one SSS group (SSSG), then determining at least one SSS from each SSSG;
when the SSSs include a set of the SSSs outside any SSSG, then determining the at least one SSS from the set of the SSSs; and
detecting downlink control information (DCI) in the at least one SSS, the DCI including a field indicating a power saving operation for physical downlink control channel (PDCCH) monitoring, the DCI detected in the at least one SSS determined from the set of the SSSs comprising a field that indicates a PDCCH skipping scheme, wherein the PDCCH monitoring is skipped when no data traffic arrives.
2 . The method of claim 1 , wherein at least one of:
determining the at least one SSS from each SSSG includes determining the at least one SSS with a highest priority in the SSSG; or
determining the at least one SSS from the set of the SSSs includes determining the at least one SSS with the highest priority in the set of the SSSs.
3 . The method of claim 2 , wherein a priority of each SSS is determined based on a DCI format associated with the SSS.
4 . The method of claim 2 , wherein at least one of:
a user equipment (UE) specific search space set (USS) with a lower index in an SSSG has a higher priority than a USS with a higher index in the SSSG; or
the USS with the lower index in the set of the SSSs has the higher priority than the USS with the higher index in the set of the SSSs.
5 . The method of claim 2 , wherein at least one of:
a user equipment (UE) specific search space set (USS) in an SSSG has a higher priority than a common search space set (CSS) in the SSSG; or
a USS in the set of the SSSs has the higher priority than the CSS in the set of the SSSs.
6 . The method of claim 1 , wherein at least one of:
the at least one SSS is determined from each SSSG based at least in part on a configuration received from a base station; or
the at least one SSS is determined from the set of the SSSs based at least in part on the configuration received from the base station.
7 . The method of claim 6 , wherein the configuration indicates at least one separate SSS for each SSSG.
8 . The method of claim 1 , wherein the power saving operation for the PDCCH monitoring comprises the PDCCH skipping scheme or an SSSG switching scheme.
9 . The method of claim 8 , wherein the DCI detected in the at least one SSS determined from an SSSG comprises a field for indicating the SSSG switching scheme.
10 . The method of claim 8 , wherein the DCI detected in the determined at least one SSS is configured by a base station (BS) to indicate the PDCCH skipping scheme or the SSSG switching scheme.
11 . The method of claim 1 , further comprising:
detecting a common search space set (CSS) in a PDCCH monitoring occasion during PDCCH skipping, the CSS including at least one of a type-0 CSS for scheduling system information, a type-1 CSS for data scheduling in a random access procedure, or a type-2 CSS for paging scheduling.
12 . A base station for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the base station to:
transmit configuration information for search space sets (SSSs);
when one or more of the SSSs are associated with at least one SSS group (SSSG), then determine at least one SSS from each SSSG;
when the SSSs include a set of the SSSs outside any SSSG, then determine the at least one SSS from the set of the SSSs;
determine a power saving operation for physical downlink control channel (PDCCH) monitoring; and
transmit downlink control information (DCI) in the at least one SSS, the DCI including a first field indicating the power saving operation for the PDCCH monitoring, and a second field indicating a PDCCH skipping scheme, wherein the PDCCH monitoring is skipped when no data traffic arrives.
13 . The base station of claim 12 , wherein at least one of:
the at least one SSS is determined from each SSSG as the at least one SSS with a highest priority in the SSSG; or
the at least one SSS is determined from the set of the SSSs as the at least one SSS with the highest priority in the set of the SSSs.
14 . A user equipment (UE) for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the UE to:
receive configuration information for search space sets (SSSs);
when one or more of the SSSs are associated with at least one SSS group (SSSG), then determine at least one SSS from each SSSG;
when the SSSs include a set of the SSSs outside any SSSG, then determine the at least one SSS from the set of the SSSs; and
detect downlink control information (DCI) in the at least one SSS, the DCI including a field indicating a power saving operation for physical downlink control channel (PDCCH) monitoring, the DCI detected in the at least one SSS determined from the set of the SSSs comprising a field that indicates a PDCCH skipping scheme, wherein the PDCCH monitoring is skipped when no data traffic arrives.
15 . The UE of claim 14 , wherein at least one of:
the at least one SSS is determined from each SSSG as the at least one SSS with a highest priority in the SSSG; or
the at least one SSS is determined from the set of the SSSs as the at least one SSS with the highest priority in the set of the SSSs.
16 . The UE of claim 15 , wherein a priority of each SSS is determined based on a DCI format associated with the SSS.
17 . The UE of claim 14 , wherein the power saving operation for the PDCCH monitoring comprises the PDCCH skipping scheme or an SSSG switching scheme.
18 . The UE of claim 14 , wherein the at least one processor is configured to cause the UE to detect a common search space set (CSS) in a PDCCH monitoring occasion during PDCCH skipping, the CSS including at least one of a type-0 CSS for scheduling system information, a type-1 CSS for data scheduling in a random access procedure, or a type-2 CSS for paging scheduling.
19 . A processor for wireless communication, comprising:
at least one controller coupled with at least one memory and configured to cause the processor to:
receive configuration information for search space sets (SSSs);
when one or more of the SSSs are associated with at least one SSS group (SSSG), then determine at least one SSS from each SSSG;
when the SSSs include a set of the SSSs outside any SSSG, then determine the at least one SSS from the set of the SSSs; and
detect downlink control information (DCI) in the at least one SSS, the DCI including a field indicating a power saving operation for physical downlink control channel (PDCCH) monitoring, the DCI detected in the at least one SSS determined from the set of the SSSs comprising a field that indicates a PDCCH skipping scheme, wherein the PDCCH monitoring is skipped when no data traffic arrives.
20 . The processor of claim 19 , further comprising:
detecting a common search space set (CSS) in a PDCCH monitoring occasion during PDCCH skipping, the CSS including at least one of a type-0 CSS for scheduling system information, a type-1 CSS for data scheduling in a random access procedure, or a type-2 CSS for paging scheduling.