Question: When an MME receives a PWS Failure Indication from an eNodeB, how does it notify multiple CBCs (if connected) about the failure of ongoing PWS operations in cells served by that eNodeB?
Option 1: The MME sends a unique FAILURE-INDICATION-E-UTRAN message to each CBC, detailing specific failed cells for each.
Option 2: The MME forwards the same FAILURE-INDICATION-E-UTRAN message to all CBCs with which it has active SCTP associations.
Option 3: The MME notifies one primary CBC, which is then responsible for disseminating the failure information to other connected CBCs.
Option 4: The eNodeB directly informs all relevant CBCs about the PWS operation failure, bypassing the MME.
Explanation: This option correctly reflects the specified behavior in the context of Cell Broadcast Service (CBS) for handling failures in E-UTRAN. By forwarding the same FAILURE-INDICATION-E-UTRAN message to all connected CBCs, the MME ensures consistency and efficiency in disseminating critical failure information across multiple interfaces, aligning with the principles of reliable network operation and management.