Question: In a shared spectrum channel access scenario, when a UE (User Equipment) is indicated to perform a scheduled UL (Uplink) transmission after sensing, and the transmission is associated with a channel occupancy initiated by the gNB (gNodeB), what action does the UE take if it determines that the UL transmission follows a previous transmission after a gap of more than 16µs?
Option 1: The UE transmits the UL transmission without sensing, applying CP extension if applicable.
Option 2: The UE drops the transmission regardless of channel occupancy.
Option 3: The UE senses the channel for at least a sensing slot duration within a 50µs interval before transmitting.
Option 4: The UE senses the channel for at least a sensing slot duration within a 25µs interval immediately before the scheduled UL transmission and transmits if the channel is idle.
Explanation: According to shared spectrum channel access procedures, when a UE is indicated to perform a scheduled UL transmission after sensing (associated with gNB-initiated channel occupancy) and the previous transmission gap exceeds 16µs, the UE senses the channel for at least one sensing slot duration within a 25µs interval immediately before the scheduled UL transmission. The UE then transmits if the channel is idle and drops the transmission otherwise, ensuring respectful coexistence with other shared spectrum users.