Uplink short transmission techniques using contention-based radio frequency spectrum

A method of wireless communication comprising:

• transmitting one or more downlink transmissions associated with a listen-before-talk (LBT) frame to one or more user equipment (UE), the one or more downlink transmissions indicating scheduled uplink resources allocated for uplink short transmissions (ULSTs);
• configuring a ULST window that is at least partially non-overlapping with the LBT frame;
• configuring the one or more UEs with a timer for monitoring for the one or more downlink transmissions;
• and
• configuring the one or more UEs to initiate an LBT procedure during the ULST window in an absence of detecting the one or more downlink transmissions prior to expiration of the timer;
• and
• monitoring for a ULST from the one or more UEs during the ULST window.

An apparatus for wireless communication, comprising:

• a processor;
• memory in communication with the processor;
• and
• instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
• identify data to be transmitted to a base station;
• initiate a timer based at least in part on identifying the data;
• monitor for one or more downlink transmissions from the base station, the one or more downlink transmissions indicating scheduled uplink resources allocated for uplink short transmissions (ULSTs);
• perform a ULST associated with the identified data using the scheduled uplink resources upon detection of the one or more downlink transmission from the base station before expiration of the timer;
• and
• initiate, after expiration of the timer and in an absence of the one or more downlink transmissions being detected before expiration of the timer, a listen-before talk (LBT) procedure during a ULST window.

An apparatus for wireless communication, comprising:

• a processor;
• memory in communication with the processor;
• and
• instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
• transmit one or more downlink transmissions associated with a listen-before-talk (LBT) frame to one or more user equipment (UE), the one or more downlink transmissions indicating scheduled uplink resources allocated for uplink short transmissions (UL S Ts);
• configure a ULST window that is at least partially non-overlapping with the LBT frame;
• configure the one or more UEs with a timer for monitoring for the one or more downlink transmissions;
• and
• configure the one or more UEs to initiate an LBT procedure during the ULST window in an absence of detecting the one or more downlink transmissions prior to expiration of the timer;
• and
• monitor for a ULST from the one or more UEs during the ULST window.