Techniques for determining contention window update

An apparatus for wireless communication by a wireless device at a base station, comprising:

• a memory;
• and
• at least one processor coupled to the memory, the memory and the at least one processor configured to:
• determine a reference duration of a channel occupancy time (COT) for each subband of at least one subband, the reference duration being based at least in part on a subcarrier spacing (SCS), wherein the COT includes a first slot having a plurality of symbols, and wherein the reference duration is determined based on a number of symbols of a physical downlink control channel (PDCCH) transmission transmitted during the COT;
• determine at least one reference PDCCH transmission transmitted during the reference duration;
• and
• update a contention window (CW) based at least in part on an uplink transmission granted by the at least one reference PDCCH transmission transmitted during the reference duration.

An apparatus for wireless communication at a base station, comprising:

• a memory;
• and
• at least one processor coupled to the memory, the memory and the at least one processor configured to:
• determine, for each subband of at least one subband, a reference duration of a channel occupancy time (COT);
• determine whether to use a reference physical downlink shared channel (PDSCH) transmission or a reference physical uplink shared channel (PUSCH) transmission for updating a contention window (CW), wherein the reference duration or the reference PDSCH transmission is determined based on whether a PDSCH transmission comprises a broadcast without feedback;
• and
• updating the CW based on at least one of the reference PDSCH transmission or the reference PUSCH transmission and the reference duration.

An apparatus for wireless communication at a user equipment (UE), comprising:

• a memory;
• and
• at least one processor coupled to the memory, the memory and the at least one processor configured to:
• determine, for each subband of at least one subband, a reference duration of a channel occupancy time (COT), wherein the reference duration is determined based on whether at least one non-punctured code block group (CBG) is transmitted during the reference duration, and wherein the reference duration is extended when no non-punctured shared channel transmission or no non-punctured CBG is transmitted during the reference duration;
• and
• update a contention window (CW) based at least in part on an uplink shared channel transmission during the reference duration.