Question: For a UE transmitting using Type 1 channel access procedures without explicit or implicit HARQ-ACK feedbacks, how does it adjust the contention window value (CW) before initiating the procedure for a specific channel access priority class?
Option 1: The UE uses the latest CW value used for any UL transmissions on the channel with the same channel access priority class, or defaults to a predefined minimum CW if none have been used.
Option 2: The UE always resets CW to its maximum allowed value for each new transmission without HARQ-ACK feedback.
Option 3: The UE maintains the current CW value from the last transmission on any channel, regardless of priority class or type of access procedure.
Option 4: The UE decreases CW by one step from its current value for every subsequent transmission lacking HARQ-ACK feedback.
Explanation: According to the provided context, if transmissions are not associated with explicit or implicit HARQ-ACK feedbacks, the UE adjusts CW using the latest CW value used for any UL transmissions on the channel with the same channel access priority class. If that specific priority class hasn't been used, a default is utilized, ensuring continuity and adaptability in contention window management even without feedback.