Base station-aided user equipment (UE) antenna selection

A method of wireless communication performed by a base station, the method comprising:

• receiving, from a user equipment (UE), a sounding reference signal (SRS) switching capability report indicating a first number of receive antenna ports configured for the UE to receive downlink data transmission;
• receiving, from the UE, one or more SRS transmitted over the first number of receive antenna ports, wherein the one or more SRS is received over one or more SRS resources, each SRS resource of the one or more SRS resources including one or more symbols;
• transmitting, to the UE, an indication of a second number of receive antenna ports for the UE to receive the downlink data transmission;
• transmitting, to the UE, the downlink data transmission from the base station to be received over the second number of receive antenna ports by the UE;
• and
• transmitting, to the UE, a receive precoding matric indicator (RPMI) indicating a receive combination matrix to be used by the UE for receiving the downlink data transmission over the second number of receive antenna ports of the UE.

A user equipment (UE) comprising:

• a memory storing processor-readable code;
• and
• at least one processor coupled to the memory, the at least one processor configured to execute the processor-readable code to cause the at least one processor to perform operations including:
• transmitting, to a base station, a sounding reference signal (SRS) switching capability report indicating a first number of receive antenna ports configured for the UE to receive downlink data transmission;
• transmitting, to the base station, one or more SRS over the first number of receive antenna ports, wherein the one or more SRS is transmitted using one or more SRS resources, each SRS resource of the one or more SRS resources including one or more symbols;
• receiving, from the base station, an indication of a second number of receive antenna ports for receiving the downlink data transmission from the base station;
• receiving, from the base station, the downlink data transmission from the base station over the second number of receive antenna ports;
• and
• receiving, from the base station, a receive precoding matric indicator (RPMI) indicating a receive combination matrix to be used for receiving the downlink data transmission from the base station over the second number of receive antenna ports.

A base station comprising:

• a memory storing processor-readable code;
• and
• at least one processor coupled to the memory, the at least one processor configured to execute the processor-readable code to cause the at least one processor to perform operations including:
• receiving, from a user equipment (UE), a sounding reference signal (SRS) switching capability report indicating a first number of receive antenna ports configured for the UE to receive downlink data transmission;
• receiving, from the UE, one or more SRS transmitted over the first number of receive antenna ports, wherein the one or more SRS is received over one or more SRS resources, each SRS resource of the one or more SRS resources including one or more symbols;
• transmitting, to the UE, an indication of a second number of receive antenna ports for the UE to receive the downlink data transmission;
• transmitting, to the UE, the downlink data transmission from the base station to be received over the second number of receive antenna ports by the UE;
• and
• transmitting, to the UE, a receive precoding matric indicator (RPMI) indicating a receive combination matrix to be used by the UE for receiving the downlink data transmission over the second number of receive antenna ports of the UE.