Method of performing non-codebook based physical uplink shared channel transmission and related device

A user equipment (UE) for performing a non-codebook based physical uplink shared channel (PUSCH) transmission, the UE comprising:

• at least one processor;
• and
• at least one memory coupled to the at least one processor, the at least one memory storing computer-executable instructions that, when executed by the at least one processor, cause the UE to:
• receive, from a base station (BS), first downlink control information (DCI) including a transmission configuration indication (TCI) field that indicates a source reference signal (RS) for providing transmission beam information to the UE;
• receive, from the BS, second DCI including a sounding reference signal (SRS) resource indication (SRI) field that indicates an SRS resource in an SRS resource set with usage set to non-codebook (SRS-nCB) resource set for providing precoding information to the UE;
• and
• perform the non-codebook based PUSCH transmission according to the transmission beam information and the precoding information.