Question: What is the primary condition for a User Equipment (UE) to include the CIoT small data container Information Element (IE) in an uplink message?
Option 1: When the UE needs to send downlink small user data.
Option 2: When the UE needs to send uplink small user data, SMS or location services message that is not more than 254 bytes and there are no other optional IEs to be sent.
Option 3: When the UE determines to use another IE to send uplink data in this message.
Option 4: When the UE has already sent an uplink small user data, SMS or location services message.
Explanation: The CIoT small data container IE is used by a UE to send specific types of uplink messages under certain conditions. According to the specifications, this IE should be included if the UE needs to send uplink small user data, SMS, or location services messages that do not exceed 254 bytes in size and when there are no other optional IEs to be sent in the message. This ensures efficient communication by bundling necessary information into a single container without adding unnecessary overhead.