Triggered physical random access channel for new radio unlicensed

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

• outputting a signal for transmission over a wireless channel, the signal configuring one or more random access parameters for the wireless channel;
• outputting a downlink control signal for transmission over the wireless channel, wherein the downlink control signal comprises an indication of a resource location of a plurality of random access occasions for a user equipment (UE) and a trigger for the plurality of random access occasions;
• obtaining, based at least in part on the downlink control signal, a random access signal received over the wireless channel during at least one of the plurality of random access occasions and according to the one or more random access parameters and the resource location;
• obtaining, prior to obtaining the random access signal, an indication of intent to transmit the random access signal during the at least one of the plurality of random access occasions, wherein the indication of intent to transmit the random access signal is obtained prior to the plurality of random access occasions used for transmission of the random access signal;
• refraining from reclaiming or rescheduling the at least one of the plurality of random access occasions based at least in part on the indication of intent;
• and
• establishing a connection with the UE based at least in part on the random access signal.

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 apparatus to:
• obtain a signal received over a wireless channel, the signal configuring one or more random access parameters for the wireless channel;
• obtain a downlink control signal over the wireless channel, wherein the downlink control signal comprises an indication of a resource location of a plurality of random access occasions for the UE and a trigger for the plurality of random access occasions;
• output, based at least in part on the downlink control signal, a random access signal for transmission on the wireless channel during at least one of the plurality of random access occasions and according to the one or more random access parameters and the resource location;
• output, for transmission to a network device, an indication of intent to transmit the random access signal during the at least one of the plurality of random access occasions, wherein the indication of intent to transmit the random access signal is output for transmission prior to the plurality of random access occasions used for transmission of the random access signal and the indication of intent indicates to the network device to refrain from reclaiming or rescheduling the at least one of the plurality of random access occasions;
• and
• establish a connection with the network device based at least in part on the random access signal.

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 apparatus to:
• output a signal for transmission over a wireless channel, the signal configuring one or more random access parameters for the wireless channel;
• output a downlink control signal for transmission over the wireless channel, wherein the downlink control signal comprises an indication of a resource location of a plurality of random access occasions for a user equipment (UE) and a trigger for the plurality of random access occasions;
• obtain, based at least in part on the downlink control signal, a random access signal received over the wireless channel during at least one of the plurality of random access occasions and according to the one or more random access parameters and the resource location;
• obtain, prior to the random access signal, an indication of intent to transmit the random access signal during the at least one of the plurality of random access occasions, wherein the indication of intent to transmit the random access signal is obtained prior to the plurality of random access occasions used for transmission of the random access signal;
• refrain from reclaiming or rescheduling the at least one of the plurality of random access occasions based at least in part on the indication of intent;
• and
• establish a connection with the UE based at least in part on the random access signal.