Question: In a shared spectrum channel access scenario, as per 3GPP specifications, when a UE (User Equipment) is indicated to perform a scheduled UL (Uplink) transmission after sensing, and the transmission starts after the beginning of a period but ends before the idle duration, 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.
Option 2: 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 idle.
Option 3: The UE drops the scheduled UL transmission due to excessive gap time.
Option 4: The UE senses the channel for at least a sensing slot duration immediately before the UL transmission and transmits if the channel is sensed to be idle, dropping it otherwise.
Explanation: According to the specified procedures for shared spectrum channel access in 3GPP, when a UE is instructed to perform a scheduled UL transmission after sensing, and the conditions of starting after the period’s beginning but ending before its idle duration are met, the UE’s action depends on the gap time from the previous transmission. For gaps **more than 16µs**, the UE must sense the channel for at least one sensing slot duration right before transmitting. If the channel is sensed as idle, the UE proceeds with the transmission; otherwise, it drops the transmission. This ensures efficient and respectful use of shared spectrum resources.