On co-channel sidelink LTE V2V and DSRC communication

A wireless device for wireless communication, comprising:

• a memory;
• and
• at least one processor coupled to the memory and configured to:
• determine a set of energy values on a plurality of subframes over a set of frequencies including a first frequency, wherein a target subframe is associated with the first frequency, wherein the target subframe and first frequency provide a low received energy level that is less than or equal to an energy threshold;
• select a countdown number within a size of a contention window including a plurality of slots before the target subframe;
• determine whether each slot of the plurality of slots is idle or utilized while waiting for the target subframe;
• count down the countdown number during each of the determined idle slots;
• determine a congestion level based on a number of interruptions during the countdown of the countdown number;
• adjusting the size of the contention window based on the determined congestion level;
• determine whether the countdown number has reached a threshold number before reaching the target subframe;
• and
• perform, when the countdown number is determined to have reached the threshold number, one of:
• deferring from transmitting until the target subframe is reached, or
• transmitting a channel usage beacon signal (CUBS) until a next subframe or the target subframe is reached.

A wireless device for wireless communication, comprising:

• means for determining a set of energy values on a plurality of subframes over a set of frequencies including a first frequency, wherein a target subframe is associated with the first frequency, wherein the target subframe and first frequency provide a low received energy level that is less than or equal to an energy threshold;
• means for selecting a countdown number within a size of a contention window including a plurality of slots before the target subframe;
• means for determining whether each slot of the plurality of slots is idle or utilized while waiting for the target subframe;
• means for counting down the countdown number during each of the determined idle slots;
• means for determining a congestion level based on a number of interruptions during the countdown of the countdown number;
• means for adjusting the size of the contention window based on the determined congestion level;
• means for determining whether the countdown number has reached a threshold number before reaching the target subframe;
• and
• means for performing, when the countdown number is determined to have reached the threshold number, one of:
• deferring from transmitting until the target subframe is reached, or
• transmitting a channel usage beacon signal (CUBS) until a next subframe or the target subframe is reached.

A non-transitory computer-readable medium storing computer executable code, comprising code to:

• determine a set of energy values on a plurality of subframes over a set of frequencies including a first frequency, wherein a target subframe is associated with the first frequency, wherein the target subframe and first frequency provide a low received energy level that is less than or equal to an energy threshold;
• select a countdown number within a size of a contention window including a plurality of slots before the target subframe;
• determine whether each slot of the plurality of slots is idle or utilized while waiting for the target subframe;
• count down the countdown number during each of the determined idle slots;
• determine a congestion level based on a number of interruptions during the countdown of the countdown number;
• adjust the size of the contention window based on the determined congestion level;
• determine whether the countdown number has reached a threshold number before reaching the target subframe;
• and
• perform, when the countdown number is determined to have reached the threshold number, one of:
• deferring from transmitting until the target subframe is reached, or
• transmitting a channel usage beacon signal (CUBS) until a next subframe or the target subframe is reached.