Question: In a Cell Broadcast Service (CBS), what triggers the inclusion of the eNodeB ID in the Broadcast Empty Area List, as reported by the MME to the CBC via the STOP-WARNING-INDICATION primitive?
Option 1: Successful stopping of the broadcast in all cells within the eNodeB.
Option 2: Receipt of a KILL RESPONSE without a Broadcast Cancelled Area List IE from the eNodeB.
Option 3: Establishment of an SCTP association with multiple CBCs by the MME.
Option 4: Aggregation of Broadcast Cancelled Area Lists from multiple eNodeBs.
Explanation: The correct answer is Option 2 because, according to the specifications, if the MME receives a KILL RESPONSE without a Broadcast Cancelled Area List IE from an eNodeB, it shall include the eNodeB ID in the Broadcast Empty Area List instead. This indicates that the absence of the Broadcast Cancelled Area List IE in the response is what triggers this action, highlighting a scenario where stopping the broadcast might not have been successful or acknowledged with specific area list details.