Method and apparatus for uplink transmission and reception in a wireless communication system

A user equipment (UE) performing an uplink transmission in a wireless communication system, the UE comprising:

• a transceiver;
• at least one processor;
• and
• at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:
• receiving, from a base station, downlink control information (DCI) for a scheduling of an uplink shared channel;
• and
• performing the uplink transmission via the uplink shared channel based on the DCI,
• wherein the DCI includes a sounding reference signal resource indication (SRS resource indication, SRI) field carrying a SRI and a demodulation reference signal (DMRS) related field configured for a port configuration of the DMRS,
• wherein a number of layers for the uplink transmission is determined based on the SRI field,
• wherein a size of the DMRS related field is same for each of candidates of the number of layers, and is determined based on a specific candidate, in which a number of DMRS states is configured to the maximum, among the candidates.

A Base Station (BS) performing an uplink reception in a wireless communication system by a base station, the BS comprising:

• a transceiver;
• at least one processor;
• and
• at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:
• transmitting, to a user equipment (UE), downlink control information (DCI) for a scheduling of an uplink shared channel;
• and
• performing the uplink reception via the uplink shared channel based on the DCI,
• wherein the DCI includes a sounding reference signal resource indication (SRS resource indication, SRI) field carrying a SRI and a demodulation reference signal (DMRS) related field configured for a port configuration of the DMRS,
• wherein a number of layers for the uplink transmission is determined based on the SRI field,
• wherein a size of the DMRS related field is same for each of candidates of the number of layers, and is determined based on a specific candidate, in which a number of DMRS states is configured to the maximum, among the candidates.