Beam control techniques for a transparent repeater

1 . A repeater device for wireless communications, comprising:

one or more processors;

one or more memories coupled with the one or more processors; and

instructions stored in the one or more memories and executable by the one or more processors to cause the repeater device to:

transmit, to a network entity, a control message indicating a plurality of narrow beams of the repeater device;

receive, from the network entity during a time slot, a signal that corresponds to a first narrow beam of the plurality of narrow beams in accordance with the control message, wherein the signal is frequency division multiplexed with one or more downlink control information messages;

relay, from the network entity to a user equipment (UE) via a wide beam, a first downlink control information message of the one or more downlink control information messages that schedules the UE for a data message; and

relay, via the first narrow beam, the data message from the network entity to the UE within the time slot based at least in part on the signal corresponding to the first narrow beam.

2 . The repeater device of claim 1 , wherein the instructions are further executable by the one or more processors to cause the repeater device to:

receive a second control message indicating a plurality of sequences, wherein each sequence of the plurality of sequences corresponds to a different narrow beam of the plurality of narrow beams,

wherein the data message is relayed via the first narrow beam based at least in part on the second control message.

3 . The repeater device of claim 2 , wherein the instructions are further executable by the one or more processors to cause the repeater device to:

switch to the first narrow beam of the plurality of narrow beams based at least in part on the signal comprising a first sequence, of the plurality of sequences, that corresponds to the first narrow beam.

4 . The repeater device of claim 2 , wherein the instructions to receive the second control message are executable by the one or more processors to cause the repeater device to:

receive the second control message indicating a mapping between the plurality of sequences and a plurality of indexes for the plurality of narrow beams, wherein the data message is relayed via the first narrow beam based at least in part on the mapping.

5 . The repeater device of claim 4 , wherein the instructions are further executable by the one or more processors to cause the repeater device to:

switch to the first narrow beam corresponding to a beam index mapped to a first sequence, of the plurality of sequences, based at least in part on the signal including the first sequence and the second control message indicating the mapping.

6 . The repeater device of claim 1 , wherein the instructions are further executable by the one or more processors to cause the repeater device to:

communicate one or more messages using a second narrow beam of the plurality of narrow beams; and

switch from the second narrow beam to the first narrow beam based at least in part on the signal.

7 . The repeater device of claim 1 , wherein the instructions to relay the data message are executable by the one or more processors to cause the repeater device to:

receive the data message from the network entity; and

transmit the data message to the UE after a beam switch time gap.

8 . The repeater device of claim 1 , wherein the control message indicates a mapping between a plurality of UEs and the plurality of narrow beams, wherein the signal corresponds to the first narrow beam in accordance with the mapping.

9 . The repeater device of claim 1 , wherein the control message indicates a capability of the repeater device to relay signaling with low latency.

10 . The repeater device of claim 9 , wherein the capability of the repeater device includes a quantity of beams supported by the repeater device for transmission or reception, a capability to transmit using multiple beams simultaneously, a quantity of beams supported for simultaneous transmission or any combination thereof.

11 . The repeater device of claim 1 , wherein the instructions are further executable by the one or more processors to cause the repeater device to:

receive a second control message indicating a mapping between a plurality of sequences and a plurality of UE identifiers for a plurality of UEs; and

wherein the instructions to relay the data message are further executable by the one or more processors to cause the repeater device to:

transmit the data message via the first narrow beam serving the UE with a UE identifier mapped to a sequence included with the signal.

12 . The repeater device of claim 11 , wherein the instructions are further executable by the one or more processors to cause the repeater device to:

transmit a message indicating that a quantity of supported beams at the repeater device exceeds a quantity of configured beams at the repeater device, wherein the second control message is received in response to the message.

13 . The repeater device of claim 1 , wherein the signal includes a sequence corresponding to the first narrow beam, wherein the sequence is a Zadoff-Chu sequence, a Walsh code, a Gold sequence, or any combination thereof.

14 . A method for wireless communications at a repeater device, comprising:

transmitting, to a network entity, a control message indicating a plurality of narrow beams of the repeater device;

receiving, from the network entity during a time slot, a signal that corresponds to a first narrow beam of the plurality of narrow beams in accordance with the control message, wherein the signal is frequency division multiplexed with one or more downlink control information messages;

relaying, from the network entity to a user equipment (UE) via a wide beam, a first downlink control information message of the one or more downlink control information messages that schedules the UE for a data message; and

relaying, via the first narrow beam, the data message from the network entity to the UE within the time slot based at least in part on the signal corresponding to the first narrow beam.

15 . The method of claim 14 , further comprising:

communicating one or more messages using a second narrow beam of the plurality of narrow beams; and

switching from the second narrow beam to the first narrow beam based at least in part on the signal.

16 . The method of claim 14 , wherein the control message indicates a mapping between a plurality of UEs and the plurality of narrow beams, wherein the signal is based at least in part on the mapping.

17 . The method of claim 14 , wherein the signal includes a sequence corresponding to the first narrow beam, wherein the sequence is a Zadoff-Chu sequence, a Walsh code, a Gold sequence, or any combination thereof.

18 . A repeater device, comprising:

means for transmitting, to a network entity, a control message indicating a plurality of narrow beams of the repeater device;

means for receiving, from the network entity during a time slot, a signal that corresponds to a first narrow beam of the plurality of narrow beams in accordance with the control message, wherein the signal is frequency division multiplexed with one or more downlink control information messages;

means for relaying, from the network entity to a user equipment (UE) via a wide beam, a first downlink control information message of the one or more downlink control information messages that schedules the UE for a data message; and

means for relaying, via the first narrow beam, the data message from the network entity to the UE within the time slot based at least in part on the signal corresponding to the first narrow beam.

19 . The repeater device of claim 18 , further comprising:

means for communicating one or more messages using a second narrow beam of the plurality of narrow beams; and

means for switching from the second narrow beam to the first narrow beam based at least in part on the signal.

20 . The repeater device of claim 18 , wherein the control message indicates a mapping between a plurality of UEs and the plurality of narrow beams, wherein the signal corresponds to the first narrow beam in accordance with the mapping.

21 . The repeater device of claim 18 , wherein the signal includes a sequence corresponding to the first narrow beam, wherein the sequence is a Zadoff-Chu sequence, a Walsh code, a Gold sequence, or any combination thereof.

22 . A non-transitory computer-readable medium storing code for wireless communications at a repeater device, the code comprising instructions executable by one or more processors to:

transmit, to a network entity, a control message indicating a plurality of narrow beams of the repeater device;

receive, from the network entity during a time slot, a signal that corresponds to a first narrow beam of the plurality of narrow beams in accordance with the control message, wherein the signal is frequency division multiplexed with one or more downlink control information messages;

relay, from the network entity to a user equipment (UE) via a wide beam, a first downlink control information message of the one or more downlink control information messages that schedules the UE for a data message; and

relay, via the first narrow beam, the data message from the network entity to the UE within the time slot based at least in part on the signal corresponding to the first narrow beam.

23 . The non-transitory computer-readable medium of claim 22 , wherein the instructions are further executable by the one or more processors to:

communicating one or more messages using a second narrow beam of the plurality of narrow beams; and

switching from the second narrow beam to the first narrow beam based at least in part on the signal.

24 . The non-transitory computer-readable medium of claim 22 , wherein the control message indicates a mapping between a plurality of UEs and the plurality of narrow beams, wherein the signal corresponds to the first narrow beam in accordance with the mapping.

25 . The non-transitory computer-readable medium of claim 22 , wherein the signal includes a sequence corresponding to the first narrow beam, wherein the sequence is a Zadoff-Chu sequence, a Walsh code, a Gold sequence, or any combination thereof.