SL power control

1 . A user equipment (UE) comprising:

a transceiver configured to:

receive, from a second UE, a first sidelink (SL) reference signal (RS), and

receive, from the second UE, information related to a transmit power for the first SL RS; and

a processor operably coupled to the transceiver, the processor configured to:

calculate a first filtered RS receive power (RSRP) for the first SL RS,

calculate a first pathloss for the first SL RS based on a difference between the transmit power and the first filtered RSRP, and

determine, based on the first pathloss, a first power for a first SL channel,

wherein the transceiver is further configured to transmit, based on a first spatial domain transmission filter, the first SL channel using the first power, and

wherein the first spatial domain transmission filter is associated with the first SL RS.

2 . The UE of claim 1 , wherein:

the transceiver is further configured to:

transmit a second SL RS, and

receive information related to a second filtered RSRP for the second SL RS,

the processor is further configured to:

calculate a second pathloss for the second SL RS based on a difference between a transmit power of the second SL RS and the second filtered RSRP, and

determine, based on the second pathloss, a second power for a second SL channel,

the transceiver is further configured to transmit, based on a second spatial domain transmission filter, the second SL channel using the second power, and

the second spatial domain transmission filter is associated with the second SL RS.

3 . The UE of claim 1 , wherein the first SL RS is associated with a SL transmission configuration indication (TCI) state corresponding to the first SL channel.

4 . The UE of claim 1 , wherein:

the transmit power is based on a P0 value for SL pathloss based power control, and

the P0 value is associated with a SL transmission configuration indication (TCI) state corresponding to the first SL channel.

5 . The UE of claim 1 , wherein:

the transmit power is based on an alpha value for SL pathloss based power control, and

the alpha value is associated with a SL transmission configuration indication (TCI) state corresponding to the first SL channel.

6 . The UE of claim 1 , wherein:

the transceiver is further configured to receive a downlink (DL) pathloss RS using a spatial domain reception filter corresponding to the first spatial domain transmission filter, and

the processor is further configured to determine a DL pathloss based on the DL pathloss RS.

7 . The UE of claim 6 , wherein:

the transmit power is based on a P0 value for DL pathloss based power control, and

the P0 value is associated with the DL pathloss RS.

8 . The UE of claim 6 , wherein:

the transmit power is based on an alpha value for DL pathloss based power control, and

the alpha value is associated with the DL pathloss RS.

9 . The UE of claim 6 , wherein the DL pathloss RS is a synchronization signal/physical broadcast channel (SS/PBCH) block with a largest RSRP measured using the spatial domain reception filter.

10 . The UE of claim 1 wherein:

the processor is further configured to:

determine N sch,Tx,PSFCH physical sidelink feedback channels (PSFCHs) to be transmitted in a slot, and

determine a first PSFCH with a highest priority among the N sch,Tx,PSFCH PSFCHs associated with a second spatial domain transmission filter, and

the transceiver is further configured to transmit (i) the first PSFCH and (ii), in descending order of priority, up to N Tx,PSFCH −1 of the N sch,Tx,PSFCH PSFCHs associated with the second spatial domain transmission filter.

11 . A method of operating a user equipment (UE), the method comprising:

receiving, from a second UE, a first sidelink (SL) reference signal (RS);

receiving, from the second UE, information related to a transmit power for the first SL RS;

calculating a first filtered RS receive power (RSRP) for the first SL RS;

calculating a first pathloss for the first SL RS based on a difference between the transmit power and the first filtered RSRP;

determining, based on the first pathloss, a first power for a first SL channel; and

transmitting based on a first spatial domain transmission filter, the first SL channel using the first power,

wherein the first spatial domain transmission filter is associated with the first SL RS.

12 . The method of claim 11 further comprising:

transmitting a second SL RS;

receiving information related to a second filtered RSRP for the second SL RS;

calculating a second pathloss for the second SL RS based on a difference between a transmit power of the second SL RS and the second filtered RSRP;

determining, based on the second pathloss, a second power for a second SL channel;

transmitting, based on a second spatial domain transmission filter, the second SL channel using the second power,

wherein the second spatial domain transmission filter is associated with the second SL RS.

13 . The method of claim 11 , wherein the first SL RS is associated with a SL transmission configuration indication (TCI) state corresponding to the first SL channel.

14 . The method of claim 11 , wherein:

the transmit power is based on a P0 value for SL pathloss based power control, and

the P0 value is associated with a SL transmission configuration indication (TCI) state corresponding to the first SL channel.

15 . The method of claim 11 , wherein:

the transmit power is based on an alpha value for SL pathloss based power control, and

the alpha value is associated with a SL transmission configuration indication (TCI) state corresponding to the first SL channel.

16 . The method of claim 11 further comprising:

receiving a downlink (DL) pathloss RS using a spatial domain reception filter corresponding to the first spatial domain transmission filter, and

determining a DL pathloss based on the DL pathloss RS.

17 . The method of claim 16 , wherein:

the transmit power is based on a P0 value for DL pathloss based power control, and

the P0 value is associated with the DL pathloss RS.

18 . The method of claim 16 , wherein:

the transmit power is based on an alpha value for DL pathloss based power control, and

the alpha value is associated with the DL pathloss RS.

19 . The method of claim 16 wherein, the DL pathloss RS is a synchronization signal/physical broadcast channel (SS/PBCH) block with a largest RSRP measured using the spatial domain reception filter.

20 . The method of claim 11 further comprising:

determining N sch,Tx,PSFCH physical sidelink feedback channels (PSFCHs) to be transmitted in a slot,

determining a first PSFCH with a highest priority among the N sch,Tx,PSFCH PSFCHs associated with a second spatial domain transmission filter, and

transmitting (i) the first PSFCH and (ii), in descending order of priority, up to N Tx,PSFCH −1 of N sch,Tx,PSFCH PSFCHs associated with the second spatial domain transmission filter.