Beam indication for multicast wakeup signals
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit, to a base station, a first message that indicates a preferred beam and a multicast session. The UE may receive, from the base station, a second message that indicates an association between a wakeup signal (WUS) and the multicast session, and a set of beams for receiving the WUS, the set of beams including the preferred beam. The UE may receive, from the base station and based at least in part on the second message, the WUS for the multicast session using a beam from the set of beams. Numerous other aspects are provided.
1 . A method of wireless communication performed by a user equipment (UE), comprising:
transmitting, to a base station, a first message that indicates a preferred beam and a multicast session;
receiving, from the base station, a second message that indicates an association between a wakeup signal (WUS) and the multicast session, and a set of beams for receiving the WUS, the set of beams including the preferred beam; and
receiving, from the base station and based at least in part on the second message, the WUS for the multicast session using a beam from the set of beams.
2 . The method of claim 1 , further comprising:
receiving a reference signal in a plurality of candidate beams; and
selecting the preferred beam from the plurality of candidate beams.
3 . The method of claim 1 , wherein the first message further indicates a channel quality associated with the preferred beam.
4 . The method of claim 1 , wherein the first message is transmitted in at least one of radio resource control signaling, a medium access control control element, uplink control information, or a physical random access channel preamble message.
5 . The method of claim 1 , wherein the second message indicates that the WUS is associated with the multicast session and another multicast session associated with a same discontinuous reception cycle length as the multicast session.
6 . The method of claim 1 , wherein the set of beams includes preferred beams of multiple UEs that transmitted a message indicating at least one of the multicast session or another multicast session associated with a same discontinuous reception cycle length as the multicast session.
7 . The method of claim 1 , wherein the set of beams includes preferred beams of multiple UEs that transmitted a message indicating the multicast session.
8 . The method of claim 1 , wherein the second message is a broadcast message or a unicast message.
9 . The method of claim 1 , wherein the WUS indicates whether the UE is to monitor a physical downlink control channel during a discontinuous reception on-duration for the multicast session.
10 . The method of claim 1 , further comprising:
selectively performing a wakeup operation based at least in part on the WUS.
11 . The method of claim 1 , wherein the UE is a reduced capability UE.
12 . A method of wireless communication performed by a base station, comprising:
receiving, from a user equipment (UE), a first message that indicates a preferred beam and a multicast session;
transmitting, to the UE, a second message that indicates an association between a wakeup signal (WUS) and the multicast session, and a set of beams for receiving the WUS, the set of beams including the preferred beam; and
transmitting, based at least in part on the second message, the WUS for the multicast session using the set of beams.
13 . The method of claim 12 , further comprising:
transmitting a reference signal in a plurality of candidate beams,
wherein the preferred beam is one of the plurality of candidate beams.
14 . The method of claim 12 , further comprising:
determining the association between the WUS and the multicast session based at least in part on the first message.
15 . The method of claim 12 , wherein the first message further indicates a channel quality associated with the preferred beam.
16 . The method of claim 12 , wherein the first message is received in at least one of radio resource control signaling, a medium access control control element, uplink control information, or a physical random access channel preamble message.
17 . The method of claim 12 , wherein the second message indicates that the WUS is associated with the multicast session and another multicast session associated with a same discontinuous reception cycle length as the multicast session.
18 . The method of claim 12 , wherein the set of beams includes preferred beams of multiple UEs that transmitted a message indicating at least one of the multicast session or another multicast session associated with a same discontinuous reception cycle length as the multicast session.
19 . The method of claim 12 , wherein the set of beams includes preferred beams of multiple UEs that transmitted a message indicating the multicast session.
20 . The method of claim 12 , wherein the second message is a broadcast message or a unicast message.
21 . The method of claim 12 , wherein the WUS indicates whether the UE is to monitor a physical downlink control channel during a discontinuous reception on-duration for the multicast session.
22 . The method of claim 12 , wherein the UE is a reduced capability UE.
23 . A user equipment (UE) for wireless communication, comprising:
a memory; and
one or more processors operatively coupled to the memory, the one or more processors configured to:
transmit, to a base station, a first message that indicates a preferred beam and a multicast session;
receive, from the base station, a second message that indicates an association between a wakeup signal (WUS) and the multicast session, and a set of beams for receiving the WUS, the set of beams including the preferred beam; and
receive, from the base station and based at least in part on the second message, the WUS for the multicast session using a beam from the set of beams.
24 . The UE of claim 23 , wherein the second message indicates that the WUS is associated with the multicast session and another multicast session associated with a same discontinuous reception cycle length as the multicast session.
25 . The UE of claim 23 , wherein the set of beams includes preferred beams of multiple UEs that transmitted a message indicating at least one of the multicast session or another multicast session associated with a same discontinuous reception cycle length as the multicast session.
26 . The UE of claim 23 , wherein the second message is a broadcast message or a unicast message.
27 . A base station for wireless communication, comprising:
a memory; and
one or more processors operatively coupled to the memory, the one or more processors configured to:
receive, from a user equipment (UE), a first message that indicates a preferred beam and a multicast session;
transmit, to the UE, a second message that indicates an association between a wakeup signal (WUS) and the multicast session, and a set of beams for receiving the WUS, the set of beams including the preferred beam; and
transmit, based at least in part on the second message, the WUS for the multicast session using the set of beams.
28 . The base station of claim 27 , wherein the second message indicates that the WUS is associated with the multicast session and another multicast session associated with a same discontinuous reception cycle length as the multicast session.
29 . The base station of claim 27 , wherein the set of beams includes preferred beams of multiple UEs that transmitted a message indicating at least one of the multicast session or another multicast session associated with a same discontinuous reception cycle length as the multicast session.
30 . The base station of claim 27 , wherein the second message is a broadcast message or a unicast message.