Channel clearance techniques using shared radio frequency spectrum band

A method for wireless communication, comprising:

• transmitting a channel clearance signal having a length indication based at least in part on a pre-grant transmission and acknowledgment length and a radio frame transmission length;
• transmitting the pre-grant transmission indicating one or more channels for a downlink transmission and a length of the downlink transmission;
• and
• receiving a feedback communication responsive to the pre-grant transmission, the feedback communication indicating the pre-grant transmission was received and which of the one or more channels are available for the downlink transmission.

An apparatus for communication at a wireless device, comprising:

• a processor;
• memory in electronic communication with the processor;
• and
• instructions stored in the memory;
• wherein the instructions are executable by the processor to:
• perform, by a wireless device, a listen-before-talk (LBT) procedure;
• receive a pre-grant transmission indicating one or more channels for a downlink transmission and a length of the downlink transmission;
• transmit a channel clearance signal based at least in part on the LBT procedure;
• and
• transmit a feedback communication responsive to the pre-grant transmission, the feedback communication indicating the pre-grant transmission was received and which of the one or more channels are available based on the LBT procedure.

An apparatus for communication at a wireless device, comprising:

• a processor;
• memory in electronic communication with the processor;
• and
• instructions stored in the memory;
• wherein the instructions are executable by the processor to:
• transmit a channel clearance signal having a length indication based at least in part on a pre-grant transmission and acknowledgment length and a radio frame transmission length;
• transmit the pre-grant transmission indicating one or more channels for a downlink transmission and a length of the downlink transmission;
• and
• receive a feedback communication responsive to the pre-grant transmission, the feedback communication indicating the pre-grant transmission was received and which of the one or more channels are available for the downlink transmission.