BEAM INDICATION FOR 5G NEW RADIO

1 . A wireless transmit/receive unit (WTRU) comprising:

a transceiver; and

a processor;

wherein:

the transceiver is configured to receive sounding reference signal (SRS) resource configuration information;

the transceiver is further configured to receive a SRS trigger, beam indication (beam ID) information, and panel identification (panel ID) in downlink control information (DCI), wherein the SRS trigger is for one or more SRS resource sets;

the processor is configured to determine at least one WTRU panels based on the panel ID or the SRS resource configuration information;

the processor is further configured to determine at least one sweeping beam for the determined at least one WTRU panels based on the beam ID information, wherein the beam ID information includes a start beam ID, a step size, and an end beam ID, or a list of beam IDs, or the beam ID information indicates a center and half range parameters;

the processor is further configured to perform uplink (UL) beam sweeping using the determined at least one WTRU panel and the determined at least one sweeping beam; and

the transceiver is further configured to receive one or more SRS resource indicators (SRIs) for at least two WTRU panels in relation to a physical uplink shared channel (PUSCH) communication.

2 . The WTRU of claim 1 , wherein the at least one sweeping beam is further determined based on a repetition fields in the SRS trigger in the DCI, or a last or prior WTRU downlink (DL) or UL beam measurement result.

3 . The WTRU of claim 2 , wherein the repetition field indicates a spatial domain transmission filter is on or off at the WTRU in relation to the WTRU performing a U-2 or U-3 procedure.

4 . The WTRU of claim 1 , wherein the SRS resource configuration information includes information indicating association of a SRS resource set of the one or more SRS resource sets or a SRS resource with a WTRU panel.

5 . The WTRU of claim 1 , wherein the determined at least one WTRU panels is associated with a transmission reception point (TRP) for multi-TRP operation and a SRI is determined for a physical uplink shared channel (PUSCH).

6 . The WTRU of claim 1 further comprising:

the processor configured to determine the at least one sweeping beam for the determined at least one WTRU panels based on the beam ID information for one or more transmission reception points (TRPs).

7 . The WTRU of claim 1 further comprising:

the transceiver is further configured to receive SRS field information for each uplink (UL) bandwidth part (BWP) or a plurality of UL BWPs, wherein the SRS field information includes a plurality of sub-fields including a SRS Res set field, a SRS Res rep field, and a beam indication field that includes a central RS ID field and a beam range field.

8 . A method performed by a wireless transmit/receive unit (WTRU), the method comprising:

receiving, by the WTRU, a sounding reference signal (SRS) resource configuration information;

receiving, by the WTRU, a SRS trigger, beam indication (beam ID) information, and panel identification (panel ID) in downlink control information (DCI), wherein the SRS trigger is for one or more SRS resource sets;

determining, by the WTRU, at least one WTRU panels based on the panel ID or the SRS resource configuration information;

determining, by the WTRU, at least one sweeping beam for the determined at least one WTRU panels based on the beam ID information, wherein the beam ID information includes a start beam ID, a step size, and an end beam ID, or a list of beam IDs, or the beam ID information indicates a center and half range parameters;

performing, by the WTRU, uplink (UL) beam sweeping using the determined at least one WTRU panel and the determined at least one sweeping beam; and

receiving, by the WTRU, one or more SRS resource indicators (SRIs) for at least two WTRU panels in relation to a physical uplink shared channel (PUSCH) communication.

9 . The method of claim 8 , wherein the at least one sweeping beam is further determined based on a repetition fields in the SRS trigger in the DCI, or a last or prior WTRU downlink (DL) or UL beam measurement result.

10 . The method of claim 9 , wherein the repetition field indicates a spatial domain transmission filter is on or off at the WTRU in relation to the WTRU performing a U-2 or U-3 procedure.

11 . The method of claim 8 , wherein the SRS resource configuration information includes information indicating association of a SRS resource set of the one or more SRS resource sets or a SRS resource with a WTRU panel.

12 . The method of claim 8 , wherein the determined at least one WTRU panels is associated with a transmission reception point (TRP) for multi-TRP operation and a SRI is determined for a physical uplink shared channel (PUSCH).

13 . The method of claim 8 further comprising determining, by the WTRU, at least one sweeping beam for the determined at least one WTRU panels based on the beam ID information for one or more transmission reception points (TRPs).

14 . The method of claim 8 further comprising receiving, by the WTRU, SRS field information for each uplink (UL) bandwidth part (BWP) or a plurality of UL BWPs, wherein the SRS field information includes a plurality of sub-fields including a SRS Res set field, a SRS Res rep field, and a beam indication field that includes a central RS ID field and a beam range field.

The method of claim 8 , wherein beam sweeping comprises transmitting beams in a plurality of predefined directions during an interval to identify at least one optimal UL transmit beam

15 . The method of claim 8 , wherein beam sweeping comprises transmitting beams in a plurality of predefined directions during an interval to identify at least one optimal UL transmit beam