Method and apparatus of uplink transmission

A base station for wireless communication, comprising:

• at least one memory;
• and
• at least one processor coupled with the at least one memory and
• configured to cause the base station to:
• transmit first configuration information that indicates two sounding reference signal (SRS) resource sets for physical uplink shared channel (PUSCH) transmissions;
• transmit second configuration information that includes one or two configuration fields that indicate precoding information and layer number for a PUSCH, wherein the PUSCH is a PUSCH of a first scheme or a PUSCH of a second scheme wherein the second scheme is different from the first scheme, wherein in a case that the PUSCH is the PUSCH of the first scheme, a first set of layers of the PUSCH is associated with a first SRS resource set of the two SRS resource sets and a second set of layers of the PUSCH which are remaining layers except for the first set of layers of the PUSCH is associated with a second SRS resource set of the two SRS resource sets, and both a number of the first set of layers and a number of the second set of layers are equal to or larger than 1;
• and
• receive the PUSCH, wherein the PUSCH is transmitted with precoding information determined at least according to the one or two configuration fields, a maximum SRS resource port number of the two SRS resource sets, a number of PUSCH antenna port for the PUSCH, a configured maximum rank for the PUSCH, and whether the PUSCH is the PUSCH of the first scheme or the PUSCH of the second scheme.

A processor for wireless communication, comprising:

• at least one controller coupled with at least one memory and configured to cause the processor to:
• receive first configuration information that indicates two sounding reference signal (SIRS) resource sets for physical uplink shared channel (PUSCH) transmissions;
• receive second configuration information that includes one or two configuration fields that indicate precoding information and layer number for a PUSCH, wherein the PUSCH is a PUSCH of a first scheme or a PUSCH of a second scheme, wherein the second scheme is different from the first scheme, wherein in a case that the PUSCH is the PUSCH of the first scheme, a first set of layers of the PUSCH is associated with a first SRS resource set of the two SRS resource sets and a second set of layers of the PUSCH which are remaining layers except for the first set of layers of the PUSCH is associated with a second SRS resource set of the two SRS resource sets, and both a number of the first set of layers and a number of the second set of layers are equal to or larger than 1;
• and
• transmit the PUSCH with precoding;
• information determined at least according to the one or two configuration fields, a maximum SRS resource port number of the two SRS resource sets, a number of PUSCH antenna port for the PUSCH, a configured maximum rank for the PUSCH, and whether the PUSCH is the PUSCH of the first scheme or the PUSCH of the second scheme.

A method performed by a user equipment (UE), the method comprising:

• receiving first configuration information that indicates two sounding reference signal (SRS) resource sets for physical uplink shared channel (PUSCH) transmissions;
• receiving second configuration information that includes one or two configuration fields that indicate precoding information and layer number for a PUSCH, wherein the PUSCH is a PUSCH of a first scheme or a PUSCH of a second scheme, wherein the second scheme is different from the first scheme, wherein in a case that the PUSCH is the PUSCH of the first scheme, a first set of layers of the PUSCH is associated with a first SRS resource set of the two SRS resource sets and a second set of layers of the PUSCH which are remaining layers except for the first set of layers of the PUSCH is associated with a second SRS resource set of the two SRS resource sets, and both a number of the first set of layers and a number of the second set of layers are equal to or larger than 1;
• and
• transmitting the PUSCH with precoding information determined at least according to the one or two configuration fields, a maximum SRS resource port number of the two SRS resource sets, a number of PUSCH antenna port for the PUSCH, a configured maximum rank for the PUSCH, and whether the PUSCH is the PUSCH of the first scheme or the PU SCH of the second scheme.