Techniques for full-duplex operation on sidelink and downlink in wireless communications systems
Methods, systems, and devices for wireless communications are described. Generally, the described techniques provide for a first user equipment (UE) to establish a communication link with a base station and a sidelink communication link with a second UE using different transmission reception points associated with the first UE. The first UE may perform an interference measurement between downlink communications received on the communication link and sidelink communications transmitted on the sidelink communication link. The first UE may determine whether it is able to perform full-duplex operations on the communication link and the sidelink communication link based on the interference measurement and may transmit an indication of the capability of the first UE to the base station. In some examples, the second UE may perform measurements of interference from downlink signals on the sidelink communication link, where the measurements may inform the determination to use full-duplex communications at the first UE.
1 . A method for wireless communications at a first user equipment (UE), comprising:
establishing a first communication link with a base station and a sidelink communication link with a second UE;
performing an interference measurement for sidelink communications transmitted on the sidelink communication link and downlink communications received on the first communication link, wherein the sidelink communications are performed concurrently with the downlink communications and wherein the interference measurement is based at least in part on a first configuration for downlink reception on the first communication link and a second configuration for sidelink transmission on the sidelink communication link; and
transmitting, to the base station, a message indicating whether the first UE is capable of concurrently receiving downlink communications on the first communication link and transmitting sidelink communications on the sidelink communication link based at least in part on the interference measurement.
2 . The method of claim 1 , further comprising:
determining that the first UE is capable of concurrently receiving the downlink communications on the first communication link and transmitting the sidelink communications on the sidelink communication link based at least in part on determining that the interference measurement satisfies a threshold, wherein transmitting the message is based at least in part on the determination; and
receiving, from the base station, a resource grant indicating a first set of resources and a second set of resources, wherein the first set of resources and the second set of resources are configured for concurrently receiving a downlink message from the base station on the first communication link and transmitting a sidelink message to the second UE on the sidelink communication link, the first set of resources at least partially overlapping with the second set of resources.
3 . The method of claim 2 , wherein:
the resource grant comprises a downlink transmission configuration indicator state the first UE is to use for concurrently monitoring a downlink control channel while transmitting the sidelink message on the sidelink communication link,
receiving the downlink message is based at least in part on monitoring the downlink control channel.
4 . The method of claim 1 , further comprising:
determining that the first UE is incapable of concurrently receiving downlink communications on the first communication link and transmitting sidelink communications on the sidelink communication link based at least in part on determining that the interference measurement fails to satisfy a threshold, wherein transmitting the message is based at least in part on the determination.
5 . The method of claim 1 , further comprising:
transmitting, to the second UE, an interference measurement configuration for the second UE to perform one or more interference measurements between downlink communications from the base station to the first UE and sidelink communications from the first UE to the second UE; and
receiving, from the second UE, an interference measurement report comprising a result of the one or more interference measurements.
6 . The method of claim 5 , wherein the interference measurement configuration comprises one or more downlink beam directions associated with the downlink communications on the first communication link, one or more beam indices associated with one or more reference signals that are quasi co-located with the one or more downlink beam directions, one or more downlink transmission configuration indicator states indicating the one or more downlink beam directions, or any combination thereof.
7 . The method of claim 5 , wherein receiving the interference measurement report comprising the result of the one or more interference measurements comprises:
receiving an indication that the second UE is capable of concurrently receiving sidelink communications from the first UE while the first UE receives downlink communications from the base station based at least in part on the result of the one or more interference measurements.
8 . The method of claim 5 , further comprising:
determining a transmission power for transmitting the sidelink communications on the sidelink communication link based at least in part on the result of the one or more interference measurements from the second UE; and
transmitting sidelink communications on the sidelink communication link based at least in part on the transmission power.
9 . The method of claim 8 , further comprising:
receiving, from the base station, an indication of a first transmission power for the sidelink communications on the sidelink communication link, wherein the transmission power is based at least in part on an adjustment of the first transmission power and the result of the one or more interference measurements.
10 . The method of claim 1 , wherein the message further comprises an indication of one or more of a destination identification associated with the second UE, one or more sidelink beam directions associated with the sidelink communications, or one or more beam directions the first UE is capable of using for concurrently receiving the downlink communications and transmitting the sidelink communications.
11 . The method of claim 1 , further comprising:
receiving, from the base station, one or more transmission power control commands associated with a transmission power the first UE is to use to transmit sidelink communications on the sidelink communication link; and
transmitting sidelink communications on the sidelink communication link based at least in part on receiving the one or more transmission power control commands.
12 . The method of claim 1 , wherein the first communication link is associated with a first transmission reception point of a set of transmission reception points at the first UE and the sidelink communication link is associated with a second transmission reception point of the set of transmission reception points at the first UE.
13 . An apparatus for wireless communications at a first user equipment (UE), comprising:
a processor;
memory coupled with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
establish a first communication link with a base station and a sidelink communication link with a second UE;
perform an interference measurement for sidelink communications transmitted on the sidelink communication link and downlink communications received on the first communication link, wherein the sidelink communications are performed concurrently with the downlink communications and wherein the interference measurement is based at least in part on a first configuration for downlink reception on the first communication link and a second configuration for sidelink transmission on the sidelink communication link; and
transmit, to the base station, a message indicating whether the first UE is capable of concurrently receiving downlink communications on the first communication link and transmitting sidelink communications on the sidelink communication link based at least in part on the interference measurement.
14 . The apparatus of claim 13 , wherein the instructions further cause the apparatus to:
determine that the first UE is capable of concurrently receiving the downlink communications on the first communication link and transmitting the sidelink communications on the sidelink communication link based at least in part on determining that the interference measurement satisfies a threshold, wherein transmitting the message is based at least in part on the determination; and
receive, from the base station, a resource grant indicating a first set of resources and a second set of resources, wherein the first set of resources and the second set of resources are configured for concurrently receiving a downlink message from the base station on the first communication link and transmitting a sidelink message to the second UE on the sidelink communication link, the first set of resources at least partially overlapping with the second set of resources.
15 . The apparatus of claim 14 , wherein:
the resource grant comprises a downlink transmission configuration indicator state the first UE is to use for concurrently monitoring a downlink control channel while transmitting the sidelink message on the sidelink communication link, and
receiving the downlink message is based at least in part on monitoring the downlink control channel.
16 . The apparatus of claim 13 , wherein the instructions further cause the apparatus to:
determine that the first UE is incapable of concurrently receiving downlink communications on the first communication link and transmitting sidelink communications on the sidelink communication link based at least in part on determining that the interference measurement fails to satisfy a threshold, wherein transmitting the message is based at least in part on the determination.
17 . The apparatus of claim 13 , wherein the instructions further cause the apparatus to:
transmit, to the second UE, an interference measurement configuration for the second UE to perform one or more interference measurements between downlink communications from the base station to the first UE and sidelink communications from the first UE to the second UE; and
receive, from the second UE, an interference measurement report comprising a result of the one or more interference measurements.
18 . The apparatus of claim 17 , wherein the interference measurement configuration comprises one or more downlink beam directions associated with the downlink communications on the first communication link, one or more beam indices associated with one or more reference signals that are quasi co-located with the one or more downlink beam directions, one or more downlink transmission configuration indicator states indicating the one or more downlink beam directions, or any combination thereof.
19 . The apparatus of claim 17 , wherein to receive the interference measurement report comprising the result of the one or more interference measurements, the instructions cause the apparatus to:
receive an indication that the second UE is capable of concurrently receiving sidelink communications from the first UE while the first UE receives downlink communications from the base station based at least in part on the result of the one or more interference measurements.
20 . The apparatus of claim 17 , the instructions further direction the apparatus to:
determine a transmission power for transmitting the sidelink communications on the sidelink communication link based at least in part on the result of the one or more interference measurements from the second UE; and
transmit sidelink communications on the sidelink communication link based at least in part on the transmission power.
21 . The apparatus of claim 20 , the instructions further direction the apparatus to:
receive, from the base station, an indication of a first transmission power for the sidelink communications on the sidelink communication link, wherein the transmission power is based at least in part on an adjustment of the first transmission power and the result of the one or more interference measurements.
22 . The apparatus of claim 13 , wherein the message further comprises an indication of one or more of a destination identification associated with the second UE, one or more sidelink beam directions associated with the sidelink communications, or one or more beam directions the first UE is capable of using for concurrently receiving the downlink communications and transmitting the sidelink communications.
23 . The apparatus of claim 13 , wherein the instructions further cause the apparatus to:
receive, from the base station, one or more transmission power control commands associated with a transmission power the first UE is to use to transmit sidelink communications on the sidelink communication link; and
transmit sidelink communications on the sidelink communication link based at least in part on receiving the one or more transmission power control commands.
24 . The apparatus of claim 13 , wherein the first communication link is associated with a first transmission reception point of a set of transmission reception points at the first UE and the sidelink communication link is associated with a second transmission reception point of the set of transmission reception points at the first UE.