Channel access scheme enhancements

An apparatus, comprising:

• a memory;
• and
• a processor in communication with the memory, wherein the processor is configured to:
• perform one or more channel access detection (CAD) measurements at a first periodicity on a first channel;
• determine a CAD metric based on the one or more CAD measurements at a second periodicity;
• and
• select, for the first channel, a first set of channel access procedures from a plurality of channel access procedures based on comparison of the CAD metric to a threshold, wherein the threshold includes a plurality of thresholds, wherein the plurality of thresholds define one or more ranges, wherein each range of the one or more ranges is associated with a set of channel access procedures, wherein at least one range of the one or more ranges includes one or more sub-ranges, wherein each of the one or more sub-ranges is associated with a sub-set of channel access parameters of a set of channel parameters associated with the at least one range.

A non-transitory computer readable memory medium storing program instructions executable by processing circuitry to cause a wireless device to:

• perform one or more channel access detection (CAD) measurements at a first periodicity on a first channel, wherein the one or more CAD measurements are performed during base station non-transmission intervals, wherein the base station non-transmission intervals are indicated by a slot format indicator (SFI), wherein the SFI indicates CAD measurement resources via a value of “flexible”, wherein symbols indicated by the SFI as “flexible” are non-skippable, and wherein the SFI indicates CAD measurement resources via a value of “CAD”;
• determine a CAD metric based on the one or more CAD measurements at a second periodicity;
• and
• select, for the first channel, a first channel access scheme from a plurality of channel access schemes based on comparison of the CAD metric to a threshold, wherein, when the CAD metric is below the threshold, the first channel access scheme includes accessing a channel using a first listen before talk procedure that is less restrictive than a second listen before talk procedure used when the CAD metric is above the threshold.