Radio resource configuration for power saving
Apparatuses, methods, and systems are disclosed for radio resource configuration for power saving. One method includes monitoring, via a first receiver including a wake-up receiver, a sidelink control channel for a WUS. The method includes monitoring, via a second receiver, a physical sidelink control channel and a data channel. The second receiver includes a baseband processing unit separate from the first receiver. The method includes receiving a radio resource configuration for WUS reception. The method includes receiving, outside an active period, the WUS in a resource indicated by the radio resource configuration. The method includes determining to wake-up the second receiver based on the WUS. The WUS includes a wake-up indicator bit, a destination identifier, or a combination thereof.
1 . A user equipment (UE), comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the UE to:
monitor, via a first receiver comprising a wake-up receiver, a sidelink control channel for a wake-up signal, wherein the wake-up signal comprises a narrow-band signal transmitted within at least one subchannel in a resource pool, and the wake-up signal is transmitted by at least one transmitter UE of a plurality of transmitter UEs, and wherein the wake-up receiver comprises a narrowband RF front end and is configured to operate without baseband synchronization;
monitor, via a second receiver, a physical sidelink control channel and a data channel, wherein the second receiver comprises a baseband processing unit separate from the first receiver, and wherein the second receiver is activated in response to the wake-up signal received by the wake-up receiver;
receive a radio resource configuration (RRC) for wake-up signal reception, wherein the RRC comprises one or more of candidate wake-up signal monitoring slots in a resource pool, candidate wake-up signal monitoring symbols in the resource pool, candidate wake-up signal monitoring subchannels in the resource pool, or a time offset from a second receiver on-duration;
receive, outside an active period, the wake-up signal in a resource indicated by the RRC;
determine whether the UE is addressed based on a wake-up indicator bit, or a destination identifier, or both included in the wake-up signal; and
determine to wake-up the second receiver based on the wake-up signal, wherein the second receiver enables sidelink control or data reception during a configured on-duration.
2 . The UE of claim 1 , wherein the at least one processor is configured to cause the UE to receive the wake-up signal before the active period of a UE in the subchannels in the resource pool, and the wake-up signal is frequency division multiplexed with other subchannels, resource pools, or sidelink bandwidth parts configured for the sidelink control and the data channel during the active period of the UE.
3 . The UE of claim 2 , wherein the wake-up signal comprises a resource pool identifier, subchannel identifier, or sidelink bandwidth part identifier for sidelink communications occurring during the active period of the UE.
4 . The UE of claim 1 , wherein the at least one processor is configured to cause the UE to receive the wake-up signal in a slot within a subchannel in the resource pool, wherein the resource pool comprises a plurality of wake-up signal blocks, and each wake-up signal block of the plurality of wake-up signal blocks carries sidelink control information (SCI) of a corresponding wake-up signal for a destination identifier of at least one receiver UE.
5 . The UE of claim 4 , wherein a number of wake-up signal blocks in a wake-up signal resource is configured as part of the resource pool.
6 . The UE of claim 1 , wherein the at least one processor is configured to cause the UE to receive a plurality of wake-up signals, wherein each wake-up signal of the plurality of wake-up signals is set to ‘1’ or ‘0’ and has a corresponding destination identifier depending on whether there is data to be transmitted to the destination identifier in a next occurrence of a discontinuous reception (DRX) active period.
7 . The UE of claim 1 , wherein the RRC comprises one or more of candidate wake-up signal monitoring slots in a resource pool, candidate wake-up signal monitoring symbols in the resource pool, candidate wake-up signal monitoring the subchannels in the resource pool, or a time offset from the second receiver on-duration, and the RRC is configurable per one or more of resource pool, destination identifier, or PC5 radio resource control connection.
8 . The UE of claim 1 , wherein: a resource for each wake-up signal is associated with one or more of each group member of a wake-up signal block based on a member identifier via explicit higher layer semi static signaling or implicitly, a lowest member identifier is assigned to a lowest wake-up signal block in a wake-up signal resource, or wake-up signal blocks are assigned to group member UEs in a time division multiplexed manner to avoid half duplex issues.
9 . The UE of claim 1 , wherein the at least one processor is configured to start a discontinuous reception (DRX) on-duration timer even if at least one sidelink control information (SCI) wake-up signal is received before a wake-up signal offset containing a wake-up bit set to ‘1’ from one or more destination identifiers configured for at least one receiver UE.
10 . A method performed by a user equipment (UE), comprising:
monitoring, via a first receiver comprising a wake-up receiver, a sidelink control channel for a wake-up signal, wherein the wake-up signal comprises a narrow-band signal transmitted within at least one subchannel in a resource pool, and the wake-up signal is transmitted by at least one transmitter UE of a plurality of transmitter UEs, and wherein the wake-up receiver comprises a narrowband RF front end and is configured to operate without baseband synchronization;
monitoring, via a second receiver, a physical sidelink control channel and a data channel, wherein the second receiver comprises a baseband processing unit separate from the first receiver, and wherein the second receiver is activated in response to the wake-up signal received by the wake-up receiver;
receiving a radio resource configuration (RRC) for wake-up signal reception, wherein the RRC comprises one or more of candidate wake-up signal monitoring slots in a resource pool, candidate wake-up signal monitoring symbols in the resource pool, candidate wake-up signal monitoring subchannels in the resource pool, or a time offset from a second receiver on-duration;
receiving, outside an active period, the wake-up signal in a resource indicated by the RRC;
determining whether the UE is addressed based on a wake-up indicator bit, or a destination identifier, or both included in the wake-up signal; and
determining to wake-up the second receiver based on the wake-up signal, wherein the second receiver enables sidelink control or data reception during a configured on-duration.
11 . The method of claim 10 , further comprising receiving the wake-up signal before the active period of a UE in the subchannels in the resource pool, and the wake-up signal is frequency division multiplexed with other subchannels, resource pools, or sidelink bandwidth parts configured for the sidelink control and the data channel during the active period of the UE.
12 . The method of claim 11 , wherein the wake-up signal comprises a resource pool identifier, subchannel identifier, or sidelink bandwidth part identifier for sidelink communications occurring during the active period of the UE.
13 . The method of claim 10 , further comprising receiving the wake-up signal in a slot within a subchannel in the resource pool, wherein the resource pool comprises a plurality of wake-up signal blocks, and each wake-up signal block of the plurality of wake-up signal blocks carries sidelink control information (SCI) of a corresponding wake-up signal for a destination identifier of at least one receiver UE.
14 . The method of claim 13 , wherein a number of wake-up signal blocks in a wake-up signal resource is configured as part of the resource pool.