Sounding reference signal resource indicator designs for codebook-based communications

A network entity for wireless communication, comprising:

• one or more memories;
• and one or more processor coupled to the one or more memories and individually or collectively configured to:
• transmit one or more control messages that indicate:
• a quantity of a plurality of sound reference signal (SRS) resource sets, a quantity of one or more SRS resource indicator fields included in one or more control messages, and a quantity of one or more transmit precoding matrix indicator (TPMI) fields included in the one or more control messages, wherein the plurality of SRS resource sets are configured for codebook usage, and
• at least one maximum rank value that be associated with uplink shared channel transmissions from a user equipment (UE), the at least one maximum rank value being based at least in part on a threshold quantity of rank values supported by the UE;
• transmit a message comprising downlink control information that schedules an uplink shared channel message, the downlink control information including one or more SRS resource indicator fields and one or more TPMI fields;
• and
• receive the uplink shared channel message in accordance with according to a mapping between a content of the one or more TPMI fields and a quantity of ports associated with at least one SRS resource from the plurality of SRS resource sets, the mapping being indicated by:
• a quantity of the at least one maximum rank value, and
• a maximum quantity of ports the UE is capable of supporting.

A method for wireless communication by a user equipment (UE), comprising:

• receiving one or more control messages that indicate:
• a quantity of a plurality of sounding reference signal (SRS) resource sets, a quantity of one or more SRS resource indicator fields included in one or more control messages, and a quantity of one or more transmit precoding matrix indicator (TPMI) fields included in the one or more control messages, wherein the plurality of SRS resource sets are configured for codebook usage, and
• at least one maximum rank value that is associated with uplink shared channel transmissions from the UE, the at least one maximum rank value being based at least in part on a threshold quantity of rank values supported by the UE;
• receiving a message comprising downlink control information that schedules an uplink shared channel message, the downlink control information including one or more SRS resource indicator fields and one or more TPMI fields;
• interpreting the one or more SRS resource indicator fields and the one or more TPMI fields according to a mapping between a content of the one or more TPMI fields and a quantity of ports associated with at least one SRS resource from the plurality of SRS resource sets, the mapping being indicated by:
• a quantity of the at least one maximum rank value, and
• a maximum quantity of ports the UE is capable of supporting;
• and
• transmitting the uplink shared channel message in accordance with the mapping between the content of the one or more TPMI fields and the quantity of ports associated with the at least one SRS resource from the plurality of SRS resource sets.

A method for wireless communication by a network entity, comprising:

• transmitting one or more control messages that indicate:
• a quantity of a plurality of sounding reference signal (SRS) resource sets, a quantity of one or more SRS resource indicator fields included in one or more control messages, and a quantity of one or more transmit precoding matrix indicator (TPMI) fields included in the one or more control messages, wherein the plurality of SRS resource sets are configured for codebook usage, and
• at least one maximum rank value that is associated with uplink shared channel transmissions from a user equipment (UE), the at least one maximum rank value being based at least in part on a threshold quantity of rank values supported by the UE;
• transmitting a message comprising downlink control information that schedules an uplink shared channel message, the downlink control information including one or more SRS resource indicator fields and one or more TPMI fields;
• and
• receiving the uplink shared channel message in accordance with according to a mapping between a content of the one or more TPMI fields and a quantity of ports associated with at least one SRS resource from the plurality of SRS resource sets, the mapping being indicated by:
• a quantity of the at least one maximum rank value, and
• a maximum quantity of ports the UE is capable of supporting.