Vehicle-to-everything ultra-reliable/low-latency communications design

A method for wireless communication, comprising:

• receiving, during a listen-before-talk (LBT) procedure, an indication reserving a plurality of shortened transmission time intervals (TTIs) to be used for priority communications to or from a vehicle having a first traffic priority level, the plurality of shortened TTIs each having a duration that is less than that of other TTIs used in other communications to or from the vehicle having a second traffic priority level which is less than the first traffic priority level;
• transmitting, during the LBT procedure, an acknowledgement (ACK) message responsive to the indication;
• and
• receiving, during at least one instance of the plurality of shortened TTIs, a request further reserving the at least one instance of the plurality of shortened TTIs for the priority communications.

A method for wireless communication, comprising:

• receiving, during a listen-before-talk (LBT) procedure, an indication reserving a plurality of shortened transmission time intervals (TTIs) to be used for priority communications to or from a vehicle having a first traffic priority level, the plurality of shortened TTIs each having a duration that is less than that of other TTIs used in other communications to or from the vehicle having a second traffic priority level which is less than the first traffic priority level;
• determining that a request-to-send (RTS) message is not transmitted during a first symbol in at least one of the shortened TTIs;
• and
• performing an LBT procedure on resources that overlap in time with the at least one shortened TTI to reserve a TTI that includes the overlapping resources and that is longer than the at least one shortened TTI for other communications having the second traffic priority.

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 plurality of shortened transmission time intervals (TTIs) to be used for priority communications to or from a vehicle having a first traffic priority level, the plurality of shortened TTIs each having a duration that is less than that of other TTIs used in other communications to or from the vehicle having a second traffic priority level which is less than the first traffic priority level;
• perform a listen-before-talk (LBT) procedure in order to reserve the plurality of shortened TTIs for the priority communications;
• and
• further reserving at least one instance of the plurality of shortened TTIs for the priority communications.