Radio (NR) multicast feedback switching

1 . A user equipment (UE), comprising:

a transceiver configured to:

receive a first indication of a first configuration for a negative-acknowledgement (NACK) feedback mode, wherein the first configuration is a common NACK configuration among a group of UEs including the UE;

receive, via UE-specific signaling, a second indication of a second configuration for an acknowledgement/negative-acknowledgement (ACK/NACK) feedback mode, wherein the second configuration is a UE-specific ACK/NACK configuration designated to the UE;

receive, via at least one of radio resource configuration control signaling or control information signaling, a third indication that indicates the UE is to use the common NACK configuration or the UE-specific ACK/NACK configuration;

receive a multicast communication; and

transmit a NACK feedback for the multicast communication based on the first configuration in response to the third indication indicating that the UE is to use the common NACK configuration, or transmit an ACK feedback or a NACK feedback for the multicast communication based on the second configuration in response to the third indication indicating that the UE is to use the UE-specific ACK/NACK configuration.

2 . The UE of claim 1 , wherein the first configuration includes at least one of a different time configuration, a different frequency configuration, or a different sequence configuration than the second configuration.

3 . The UE of claim 1 , wherein the transceiver configured to transmit the NACK feedback for the multicast communication is further configured to:

transmit, in response to receiving an instruction for the UE to use the NACK feedback mode, the NACK feedback for the multicast communication based on the first configuration.

4 . The UE of claim 1 , wherein the transceiver configured to transmit the ACK feedback or the NACK feedback for the multicast communication is further configured to:

transmit, in response to receiving an instruction for the UE to use the ACK/NACK feedback mode, the ACK feedback or the NACK feedback for the multicast communication based on the second configuration.

5 . The UE of claim 1 , wherein the first configuration and the second configuration include a same frequency configuration and a same time configuration, and wherein the third indication further indicates a rule for the UE to select between the NACK feedback mode or the ACK/NACK feedback mode.

6 . The UE of claim 5 , wherein the transceiver is further configured to:

receive a scheduling grant for the multicast communication, the scheduling grant including a first spreading code for use by the UE in transmitting NACK feedback in the NACK feedback mode and a second spreading code for use by the UE in transmitting the ACK feedback or NACK feedback in the ACK/NACK feedback mode, the second spreading code being different from the first spreading code.

7 . The UE of claim 5 , further comprising a processor in communication with the transceiver, the processor being configured to select a first spreading code or a second spreading code based on the rule indicated by the third indication.

8 . The UE of claim 5 , further comprising a processor in communication with the transceiver, the processor being configured to perform a channel measurement, wherein the rule for the UE to select between the NACK feedback mode or the ACK/NACK feedback mode is based on the channel measurement.

9 . The UE of claim 8 , wherein the processor is further configured to perform the channel measurement by measuring at least one of a pathloss, a reference signal received power (RSRP), a signal-to-interference-plus-noise ratio (SINR), or a channel quality indicator (CQI).

10 . The UE of claim 5 , further comprising a processor in communication with the transceiver, the processor being configured to determine a DL decoding status, wherein the rule for the UE to select between the NACK feedback mode or the ACK/NACK feedback mode is based on the DL decoding status.

11 . The UE of claim 1 , wherein the transceiver is further configured to:

transmit, to a base station (BS), a request to switch from one of the NACK feedback mode or the ACK/NACK feedback mode to the other of the NACK feedback mode or the ACK/NACK feedback mode.

12 . The UE of claim 1 , wherein the transceiver is further configured to:

transmit the NACK feedback for the multicast communication based on the first configuration and further based on a first power control procedure; and

transmit the ACK feedback or the NACK feedback for the multicast communication based on the second configuration and further based on a second power control procedure that is different from the first power control procedure.

13 . The UE of claim 12 , wherein the transceiver is further configured to:

receive, from a base station (BS), an indication of at least one of a first target received power or a first pathloss compensation for the first power control procedure; and

receive, from the base station (BS), an indication of at least one of a second target received power different from the first target received power or a second pathloss compensation different from the first pathloss compensation for the second power control procedure.

14 . The UE of claim 1 , wherein the transceiver is further configured to:

receive the first configuration for the NACK feedback mode via system information block (SIB) signaling.

15 . The UE of claim 1 , wherein the transceiver is further configured to:

receive the first configuration for the NACK feedback mode via the UE-specific signaling.

16 . A method of wireless communication performed by a user equipment (UE), comprising:

receiving a first indication of a first configuration for a negative-acknowledgement (NACK) feedback mode, wherein the first configuration is a common NACK configuration among a group of UEs including the UE;

receiving, via UE-specific signaling, a second indication of a second configuration for an acknowledgement/negative-acknowledgement (ACK/NACK) feedback mode, wherein the second configuration is a UE-specific ACK/NACK configuration designated to the UE;

receiving, via at least one of radio resource configuration control signaling or control information signaling, a third indication that indicates the UE is to use the common NACK configuration or the UE-specific ACK/NACK configuration;

receiving a multicast communication; and

transmitting a NACK feedback for the multicast communication based on the first configuration in response to the third indication indicating that the UE is to use the common NACK configuration, or transmitting an ACK feedback or a NACK feedback for the multicast communication based on the second configuration in response to the third indication indicating that the UE is to use the UE-specific ACK/NACK configuration.

17 . The method of claim 16 , wherein the first configuration includes at least one of a different time configuration, a different frequency configuration, or a different sequence configuration than the second configuration.

18 . The method of claim 16 , wherein the first configuration and the second configuration include a same frequency configuration and a same time configuration, and wherein the third indication further indicates a rule for selecting between the NACK feedback mode or the ACK/NACK feedback mode.

19 . The method of claim 16 , further comprising:

transmitting, to a base station (BS), a request to switch from one of the NACK feedback mode or the ACK/NACK feedback mode to the other of the NACK feedback mode or the ACK/NACK feedback mode.

20 . The method of claim 16 , wherein transmitting the NACK feedback for the multicast communication based on the first configuration is further based on a first power control procedure and transmitting the ACK feedback or the NACK feedback for the multicast communication based on the second configuration is further based on a second power control procedure that is different from the first power control procedure.

21 . The method of claim 16 , wherein receiving the first indication of the first configuration for the NACK feedback mode is received via system information block (SIB) signaling.

22 . A user equipment (UE), comprising:

means for receiving a first indication of a first configuration for a negative-acknowledgement (NACK) feedback mode, wherein the first configuration is a common NACK configuration among a group of UEs including the UE;

means for receiving, via UE-specific signaling, a second indication of a second configuration for an acknowledgement/negative-acknowledgement (ACK/NACK) feedback mode, wherein the second configuration is a UE-specific ACK/NACK configuration designated to the UE;

means for receiving, via at least one of radio resource configuration control signaling or control information signaling, a third indication that indicates the UE is to use the common NACK configuration or the UE-specific ACK/NACK configuration;

means for receiving a multicast communication; and

means for transmitting a NACK feedback for the multicast communication based on the first configuration in response to the third indication indicating that the UE is to use the common NACK configuration, or transmitting an ACK feedback or a NACK feedback for the multicast communication based on the second configuration in response to the third indication indicating that the UE is to use the UE-specific ACK/NACK configuration.

23 . A non-transitory computer-readable medium having program code recorded thereon, the program code comprising:

code for causing a user equipment (UE) to receive a first indication of a first configuration for a negative-acknowledgement (NACK) feedback mode, wherein the first configuration is a common NACK configuration among a group of UEs including the UE;

code for causing the UE to receive, via UE-specific signaling, a second indication of a second configuration for an acknowledgement/negative-acknowledgement (ACK/NACK) feedback mode, wherein the second configuration is a UE-specific ACK/NACK configuration designated to the UE;

code for causing the UE to receive, via at least one of radio resource configuration control signaling or control information signaling, a third indication that indicates the UE is to use the common NACK configuration or the UE-specific ACK/NACK configuration;

code for causing the UE to receive a multicast communication; and

code for causing the UE to transmit a NACK feedback for the multicast communication based on the first configuration in response to the third indication indicating that the UE is to use the common NACK configuration, or transmit an ACK feedback or a NACK feedback for the multicast communication based on the second configuration in response to the third indication indicating that the UE is to use the UE-specific ACK/NACK configuration.