Question: Upon receiving SystemInformationBlockType12 with an incomplete warning message, what action(s) does the UE take if the received messageIdentifier and serialNumber match an ongoing assembly process?
Option 1: Discard all stored segments for this messageIdentifier and serialNumber pair.
Option 2: Store the received warningMessageSegment and continue reception of SystemInformationBlockType12 to assemble the complete message.
Option 3: Forward the incomplete warning message to upper layers with a request for additional segments.
Option 4: Stop receiving SystemInformationBlockType12 for this messageIdentifier and serialNumber pair.
Explanation: When the UE receives an incomplete warning message via SystemInformationBlockType12, and the messageIdentifier and serialNumber match an ongoing assembly process, it stores the newly received segments to gradually build the complete message. This approach ensures efficient use of resources and minimizes data loss until all necessary parts are collected for forwarding to upper layers. The UE continues to receive SystemInformationBlockType12 to gather any missing segments.