Determination of demodulation reference signal and phase tracking reference signal parameters

An apparatus for wireless communications, comprising:

• a processor,
• memory in electronic communication with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the apparatus to:
• receive radio resource control signaling configured with a first set of demodulation reference signal (DM-RS) parameters for transmission of an uplink data channel of a first type;
• receive downlink control information of a first format to activate the transmission of the uplink data channel;
• select a second set of default DM-RS parameters for use with the first set of DM-RS parameters based at least in part on the first format of the received downlink control information, the second set of default DM-RS parameters comprising a DM-RS port, a number of DM-RS symbols, or a combination thereof;
• and
• activate the transmission of the uplink data channel of the first type using the first set of DM-RS parameters and the second set of default DM-RS parameters.

An apparatus for wireless communications, comprising:

• means for receiving radio resource control signaling configured with a first set of demodulation reference signal (DM-RS) parameters for transmission of an uplink data channel of a first type;
• means for receiving downlink control information of a first format to activate the transmission of the uplink data channel;
• means for selecting a second set of default DM-RS parameters for use with the first set of DM-RS parameters based at least in part on the first format of the received downlink control information, the second set of default DM-RS parameters comprising a DM-RS port, a number of DM-RS symbols, or a combination thereof;
• and
• means for activating the transmission of the uplink data channel of the first type using the first set of DM-RS parameters and the second set of default DM-RS parameters.

A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by a processor to:

• receive radio resource control signaling configured with a first set of DM-RS parameters for transmission of an uplink data channel of a first type;
• receive downlink control information of a first format to activate the transmission of the uplink data channel;
• select a second set of default DM-RS parameters use with the first set of DM-RS parameters based at least in part on the first format of the received downlink control information, the second set of default DM-RS parameters comprising a DM-RS port, a number of DM-RS symbols, or a combination thereof;
• and
• activate the transmission of the uplink data channel of the first type using the first set of DM-RS parameters and the second set of default DM-RS parameters.