The Payload Information Element carries the application payload that is transferred by the MSGin5G Service, of which the content is transparent to the MSGin5G Service. If the message originates from an MSGin5G UE, the Payload IE is a string of maximum length that can be transported without segmentation but not more than 2048 octets.

The Application ID Information Element identifies the Application Client on the UE or in the Application Server. The Application ID is a string, which shall allow identifying 65535 different Application Clients. The Application ID is configured or provisioned in the Application Client or the Application Server.

The Messaging Topic Information Element indicates the topic of the message, which an interested UE or Application Server can subscribe to. The Messaging Topic IE is a string, which shall allow identiying 65535 different Messaging Topics. Allocating and populating the Messaging Topic IE is done by the Application Client or the Application Server.

The Broadcast Area ID Information Element identifies the service area where the Broadcast Message will be delivered. The Broadcast Area ID IE is a string, which shall allow identiying 65535 different Broadcast Areas. The Broadcast Area ID is provisioned on the Application Client or the Application Server and is mapped by the Broadcast Message Gateway onto the Broadcast Area as used by the broadcast service in the 5GC.

The Message ID Information Element uniquely identifies a specific MSGin5G message in the MSGin5G Service. If message delivery status report is requested by an MSGin5G message, the Message ID IE in this MSGin5G message is used by the sender of the MSGin5G message to match the message delivery status report with the original MSGin5G message. It is also used by the MSGin5G Server in aggregating the message delivery status report message delivery status reports. The Message ID shall be unique within the MSGin5G Service and shall be generated by the sender of a new message.

The Failure Cause Information Element indicates the the failure reason of an MSGin5G message, if this MSGin5G message can not be delivered successfully. The Failure Cause IE is a string, which shall allow identiying 65535 different failure reasons.