Signaling to activate uplink trigger states

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

• receiving a configuration activating a subset of configured sounding reference signal (SRS) trigger states;
• receiving downlink control information (DCI) in a physical downlink control channel (PDCCH) triggering an aperiodic SRS transmission based on one or more SRS trigger states of activated SRS trigger states;
• determining an aperiodic SRS resource set based on the configuration and the DCI indicating the one or more SRS trigger states;
• and
• transmitting aperiodic SRS within the aperiodic SRS resource set, wherein each of the activated SRS trigger states is associated with a transmission control indicator (TCI) state for transmitting the aperiodic SRS, and wherein the transmitting the aperiodic SRS comprises transmitting the aperiodic SRS with a quasi-co location (QCL) property similar as a reference signal associated with the one or more SRS trigger states.

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 a configuration activating a subset of configured sounding reference signal (SRS) trigger states;
• receive downlink control information (DCI) in a physical downlink control channel (PDCCH) triggering an aperiodic SRS transmission based on one or more SRS trigger states of activated SRS trigger states, wherein the DCI includes one or more codepoint values indicating the one or more SRS trigger states of the activated SRS trigger states;
• receive a mapping between the activated SRS trigger states and a set of codepoint values, the one or more codepoint values being within the set of codepoint values;
• determine an aperiodic SRS resource set based on the configuration and the DCI indicating the one or more SRS trigger states;
• and
• transmit aperiodic SRS within the aperiodic SRS resource set.

A method of wireless communication of a base station (BS), comprising:

• transmitting, to a user equipment (UE), a configuration activating a subset of configured sounding reference signal (SRS) trigger states;
• transmitting, to the UE, downlink control information (DCI) in a physical downlink control channel (PDCCH) triggering an aperiodic SRS transmission based on one or more SRS trigger states of activated SRS trigger states, wherein the DCI includes one or more codepoint values indicating the one or more SRS trigger states of the activated SRS trigger states;
• transmitting a mapping between the activated SRS trigger states and a set of codepoint values, the one or more codepoint values being within the set of codepoint values;
• and
• receiving, from the UE, aperiodic SRS in an aperiodic SRS resource set based on the DCI.

A method of wireless communication of a base station (BS), comprising:

• transmitting, to a user equipment (UE), a configuration activating a subset of configured sounding reference signal (SRS) trigger states;
• transmitting, to the UE, downlink control information (DCI) in a physical downlink control channel (PDCCH) triggering an aperiodic SRS transmission based on one or more SRS trigger states of activated SRS trigger states;
• and
• receiving, from the UE, aperiodic SRS in an aperiodic SRS resource set based on the DCI, wherein each of the activated SRS trigger states is associated with a transmission control indicator (TCI) state for transmitting the aperiodic SRS by the UE, and wherein the aperiodic SRS is associated with a quasi-co location (QCL) property similar as a reference signal associated with the one or more SRS trigger states.

An apparatus for wireless communication, the apparatus being a base station (BS), comprising:

• a memory;
• and
• at least one processor coupled to the memory and configured to:
• transmit, to a user equipment (UE), a configuration activating a subset of configured sounding reference signal (SRS) trigger states;
• transmit, to the UE, downlink control information (DCI) in a physical downlink control channel (PDCCH) triggering an aperiodic SRS transmission based on one or more SRS trigger states of activated SRS trigger states, wherein the DCI includes one or more codepoint values indicating the one or more SRS trigger states of the activated SRS trigger states;
• transmit a mapping between activated SRS trigger states and a set of codepoint values, the one or more codepoint values being within the set of codepoint values;
• and
• receive, from the UE, aperiodic SRS in an aperiodic SRS resource set based on the DCI.

An apparatus for wireless communication, the apparatus being a base station (BS), comprising:

• a memory;
• and
• at least one processor coupled to the memory and configured to:
• transmit, to a user equipment (UE), a configuration activating a subset of configured sounding reference signal (SRS) trigger states;
• transmit, to the UE, downlink control information (DCI) in a physical downlink control channel (PDCCH) triggering an aperiodic SRS transmission based on one or more SRS trigger states of activated SRS trigger states;
• and
• receive, from the UE, aperiodic SRS in an aperiodic SRS resource set based on the DCI, wherein each of the activated SRS trigger states is associated with a transmission control indicator (TCI) state for transmitting the aperiodic SRS by the UE, and wherein the aperiodic SRS is associated with a quasi-co location (QCL) property similar as a reference signal associated with the one or more SRS trigger states.