Techniques for a control channel wakeup signal
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a wakeup signal (WUS) associated with a discontinuous reception (DRX) ON duration; determine that a grant was not detected in the DRX ON duration; and perform an action based at least in part on whether the WUS is specific to the UE or is associated with a group of UEs. Numerous other aspects are provided.
1 . A method of wireless communication performed by a user equipment (UE), comprising:
receiving a wakeup signal (WUS) associated with a discontinuous reception (DRX) ON duration;
waking up in the DRX ON duration;
performing a listen-before-talk operation to reserve a channel occupancy time (COT) indicated by a configured grant associated with the WUS based at least in part on determining that a grant was not received from a base station in the DRX ON duration; and
performing a transmission according to the configured grant indicating that the COT is reserved.
2 . The method of claim 1 , wherein the COT is subsequent to the DRX ON duration.
3 . The method of claim 1 , wherein the transmission includes a zero-padded uplink shared channel based at least in part on the UE having no uplink data to transmit during the COT.
4 . The method of claim 3 , wherein the transmission includes an indication that the zero-padded uplink shared channel is zero-padded.
5 . The method of claim 1 , wherein the transmission includes only an uplink control channel and a reference signal.
6 . The method of claim 5 , wherein the transmission includes only the uplink control channel based at least in part on the transmission being associated with a front-loaded reference signal.
7 . The method of claim 1 , wherein the WUS includes configuration information for the transmission.
8 . The method of claim 1 , wherein the WUS includes channel access priority class information for a channel clear assessment associated with the transmission.
9 . The method of claim 1 , wherein the WUS includes a radio resource control parameter for the transmission.
10 . The method of claim 1 , wherein the transmission indicates that the COT is shared with a base station.
11 . The method of claim 10 , further comprising:
receiving a downlink transmission from the base station based at least in part on the transmission.
12 . A method of wireless communication performed by a user equipment (UE), comprising:
receiving a wakeup signal (WUS) associated with a discontinuous reception (DRX) ON duration;
waking up in the DRX ON duration; and
performing an action based at least in part on determining that a grant was not received from a base station in the DRX ON duration and based at least in part on a determination of whether a channel occupancy time system information (COT-SI) is detected associated with the DRX ON duration.
13 . The method of claim 12 , wherein, when the COT-SI is detected in the DRX ON duration, the action comprises a baseline behavior associated with determining that the grant was not detected in the DRX ON duration.
14 . The method of claim 12 , wherein, when the COT-SI is not detected in the DRX ON duration, the action comprises waking up in a subsequent DRX ON duration after the DRX ON duration, irrespective of whether a WUS associated with the subsequent DRX ON duration is detected.
15 . The method of claim 12 , wherein the COT-SI is configured in connection with the DRX ON duration.
16 . The method of claim 12 , wherein the COT-SI is not configured in connection with the DRX ON duration.
17 . The method of claim 12 , wherein the UE is configured to wake up in one or more DRX ON durations, including the DRX ON duration, after receiving the WUS, until the UE receives the grant or the COT-SI is detected.
18 . A user equipment (UE) for wireless communication, comprising:
one or more memories; and
one or more processors, coupled to the one or more memories, configured to:
receive a wakeup signal (WUS) associated with a discontinuous reception (DRX) ON duration;
wake up in the DRX ON duration;
perform a listen-before-talk operation to reserve a channel occupancy time (COT) indicated by a configured grant associated with the WUS based at least in part on determining that a grant was not received from a base station in the DRX ON duration; and
perform a transmission according to the configured grant indicating that the COT is reserved.
19 . The UE of claim 18 , wherein the COT is subsequent to the DRX ON duration.
20 . The UE of claim 18 , wherein the transmission includes a zero-padded uplink shared channel based at least in part on the UE having no uplink data to transmit during the COT.
21 . The UE of claim 20 , wherein the transmission includes an indication that the zero-padded uplink shared channel is zero-padded.
22 . The UE of claim 18 , wherein the transmission includes only an uplink control channel and a reference signal.
23 . The UE of claim 22 , wherein the transmission includes only the uplink control channel based at least in part on the transmission being associated with a front-loaded reference signal.
24 . A user equipment (UE) for wireless communication, comprising:
one or more memories; and
one or more processors, coupled to the one or more memories, configured to:
receive a wakeup signal (WUS) associated with a discontinuous reception (DRX) ON duration;
wake up in the DRX ON duration; and
perform an action based at least in part on determining that a grant was not received from a base station in the DRX ON duration and based at least in part on a determination of whether a channel occupancy time system information (COT-SI) is detected associated with the DRX ON duration.
25 . The UE of claim 24 , wherein, when the COT-SI is detected in the DRX ON duration, the action comprises a baseline behavior associated with determining that the grant was not detected in the DRX ON duration.
26 . The UE of claim 24 , wherein, when the COT-SI is not detected in the DRX ON duration, the action comprises waking up in a subsequent DRX ON duration after the DRX ON duration, irrespective of whether a WUS associated with the subsequent DRX ON duration is detected.
27 . The UE of claim 24 , wherein the COT-SI is configured in connection with the DRX ON duration.
28 . The UE of claim 24 , wherein the COT-SI is not configured in connection with the DRX ON duration.
29 . The UE of claim 24 , wherein the UE is configured to wake up in one or more DRX ON durations, including the DRX ON duration, after receiving the WUS, until the UE receives the grant or the COT-SI is detected.