Reservation and challenge schemes for listen-before-talk

A method for wireless communication, comprising:

• identifying a gap period associated with a channel of a shared radio frequency spectrum band, the gap period comprising a periodic set of resources allocated to channel contention on the channel;
• receiving, from a contending device, a reservation request signal on the channel during the gap period;
• determining an interference risk based at least in part on the reservation request signal;
• and
• transmitting a reservation challenge signal over a reservation challenge signal resource associated with the gap period based at least in part on the determination, wherein the contending device refrains from performing a transmission on the channel based at least in part on the reservation challenge signal.

An apparatus for wireless communication, 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:
• transmit a reservation request signal on channel during a gap period associated with the channel, the gap period comprising a periodic set of resources allocated to channel contention on the channel;
• monitor a reservation challenge signal resource associated with the gap period for a reservation challenge signal;
• receive the reservation challenge signal during the gap period;
• and
• refrain from perform a transmission on the channel based at least in part on the received reservation challenge signal.

An apparatus for wireless communication, 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:
• identify a gap period associated with a channel of a shared radio frequency spectrum band, the gap period comprising a periodic set of resources allocated to channel contention on the channel;
• receive, from a contending device, a reservation request signal on the channel during the gap period;
• determine an interference risk based at least in part on the reservation request signal;
• and
• transmit a reservation challenge signal over a reservation challenge signal resource associated with the gap period based at least in part on the determination, wherein the contending device refrains from performing a transmission on the channel based at least in part on the reservation challenge signal.