Retransmission and fallback for autonomous uplink transmission

A method for wireless communication at a network device, comprising:

• detecting an autonomous uplink transmission from a user equipment (UE) over a configured resource set, the autonomous uplink transmission comprising a message one (Msg1) of a random access procedure, the Msg1 comprising demodulation reference signals and data signal, wherein the demodulation reference signals but not the data signals are detected in the autonomous uplink transmission;
• configuring, based at least in part on the determining, a response signal for transmission to the UE to indicate the demodulation reference signals were received but not the data signals;
• and
• transmitting the response signal to the UE, the response signal comprising a message two (Msg2) of the random access procedure.

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

• a processor,
• memory coupled with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the UE to:
• transmit an autonomous uplink transmission to a network device using a configured resource set, the autonomous uplink transmission comprising a message one (Msg1) of a random access procedure, the Msg1 comprising demodulation reference signals and data signals;
• receive a response signal from the network device in response to the autonomous uplink transmission, wherein
• the response signal indicates that the network device received the demodulation reference signals but not the data signals, the response signal comprising a message two (Msg2) of the random access procedure;
• and
• select an uplink transmission scheme to use for subsequent transmissions to the network device, the selected uplink transmission scheme based at least in part on receiving the response signal from the network device and that the response signal indicates that the network device received the demodulation reference signals but not the data signals.

An apparatus for wireless communication at a network device, comprising:

• a processor,
• memory coupled with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the network device to:
• detect an autonomous uplink transmission from a user equipment (UE) over a configured resource set, the autonomous uplink transmission comprising a message one (Msg1) of a random access procedure, the Msg1 comprising demodulation reference signals and data signals, wherein the demodulation reference signals but not the data signals are detected in the autonomous uplink transmission;
• configure, based at least in part on the determining, a response signal for transmission to the UE to indicate the demodulation reference signals were received but not the data signals;
• and
• transmit the response signal to the UE, the response signal comprising a message two (Msg2) of the random access procedure.

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

• means for transmitting an autonomous uplink transmission to a network device using a configured resource set, the autonomous uplink transmission comprising a message one (Msg1) of a random access procedure, the Msg1 comprising demodulation reference signals and data signals;
• means for receiving a response signal from the network device in response to the autonomous uplink transmission, wherein
• the response signal indicates that the network device received the demodulation reference signals but not the data signals, the response signal comprising a message two (Msg2) of the random access procedure;
• and
• means for selecting an uplink transmission scheme to use for subsequent transmissions to the network device, the selected uplink transmission scheme based at least in part on receiving the response signal from the network device and that the response signal indicates that the network device received the demodulation reference signals but not the data signals.

An apparatus for wireless communication at a network device, comprising:

• means for detecting an autonomous uplink transmission from a user equipment (UE) over a configured resource set, the autonomous uplink transmission comprising a message one (Msg1) of a random access procedure, the Msg1 comprising demodulation reference signals and data signals, wherein the demodulation reference signals but not the data signals are detected in the autonomous uplink transmission;
• means for configuring, based at least in part on the determining, a response signal for transmission to the UE to indicate the demodulation reference signals where received but not the data signals;
• and
• means for transmitting the response signal to the UE, the response signal comprising a message two (Msg2) of the random access procedure.

A non-transitory computer-readable medium storing code for wireless communication at a user equipment (UE), the code comprising instructions executable by a processor to:

• transmit an autonomous uplink transmission to a network device using a configured resource set, the autonomous uplink transmission comprising a message one (Msg1) of a random access procedure, the Msg1 comprising demodulation reference signals and data signals;
• receive a response signal from the network device in response to the autonomous uplink transmission, wherein
• the response signal indicates that the network device received the demodulation reference signals but not the data signals, the response signal comprising a message two (Msg2) of the random access procedure;
• and
• select an uplink transmission scheme to use for subsequent transmissions to the network device, the selected uplink transmission scheme based at least in part on receiving the response signal from the network device and that the response signal indicates that the network device received the demodulation reference signals but not the data signals.

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

• detect an autonomous uplink transmission from a user equipment (UE) over a configured resource set, the autonomous uplink transmission comprising a message one (Msg1) of a random access procedure, the Msg1 comprising demodulation reference signals and data signals, wherein the demodulation reference signals but not the data signals are detected in the autonomous uplink transmission;
• configure, based at least in part on the determining, a response signal for transmission to the UE to indicate the demodulation reference signals were received but not the data signals;
• and
• transmit the response signal to the UE, the response signal comprising a message two (Msg2) of the random access procedure.