Enhanced sounding reference signal resource allocation using a selected reference resource

A method of wireless communication at a user equipment (UE), comprising:

• receiving, from a base station, in a first downlink time slot, configuration information for a sounding reference signal (SRS) resource set, the configuration information including a set of one or more t values identifying an available time slot for transmitting an SRS resource;
• receiving, from the base station, in a second downlink time slot after the first downlink time slot, downlink control information (DCI) including an SRS triggering instruction and indication of a specified t value of the set of one or more t values;
• determining a (t+1)th time slot counting from a reference time slot that follows the second downlink time slot by at least a number of time slots corresponding to the specified t value;
• and
• transmitting a selected reference SRS resource from the SRS resource set in the (t+1)th time slot.

An apparatus for wireless communication at a user equipment (UE), comprising:

• a memory;
• and
• at least one processor coupled to the memory and configured to:
• receive, from a base station during a radio resource control (RRC) setup, in a first downlink time slot, a sounding reference signal (SRS) resource set configuration including a specified time slot offset X,
• receive, from the base station, in a second downlink time slot after the first downlink time slot, downlink control information (DCI) including an instruction to trigger a SRS resource set,
• determine, based on the SRS resource set configuration or the DCI, a starting position within a first available time slot that follows the second downlink time slot by at least a number of time slots corresponding to the specified time slot offset X, and
• transmit, at the starting position in the first available time slot, a reference SRS resource from the SRS resource set.

An apparatus for wireless communication at a base station, comprising:

• a memory;
• and
• at least one processor coupled to the memory and configured to:
• configure, during a radio resource control (RRC) setup with a user equipment (UE), a sounding reference signal (SRS) resource set having a specified time slot offset X;
• transmit, to the UE, in a first downlink time slot, the SRS resource set configuration;
• transmit, to the UE, in a second downlink time slot after the first downlink time slot, downlink control information (DCI) including an instruction to trigger the SRS resource set;
• and
• receive, at a starting position in a first available time slot that follows the second downlink time slot by at least a number of time slots corresponding to the specified time slot offset X, a reference SRS resource from the SRS resource set, wherein the SRS resource set configuration or the DCI includes information identifying the starting position.