Question: In Japan, what are the conditions for an eNB/gNB to transmit the next continuous transmission after sensing the channel to be idle, considering regional limitations on channel occupancy time?
Option 1: The channel must be sensed idle for at least 2 sensing slots, with a total sensing and transmission time not exceeding 10 ms.
Option 2: Immediately after step 4 of the procedure, without any specific sensing interval requirement, if the total transmission time doesn't exceed 5 seconds.
Option 3: The channel must be sensed idle for at least a sensing interval (consisting of a duration immediately followed by two sensing slots), with an initial idle sensing slot, and the total sensing plus transmission time not more than a specified limit.
Option 4: If the previous transmission was successfully received, as indicated by ACK from UEs, with no specific sensing interval required for the next transmission.
Explanation: This option correctly captures the nuanced conditions outlined for Japan's regional limitations: the necessity of a specific sensing interval structure, and the constraint on combined sensing and transmission time, reflecting compliance in telecom networks, particularly in shared spectrum channel access scenarios.