Page 402 - 5G Basics - Core Network Aspects

1 Core network aspects

Figure 7-1 – Architecture of eMMTel over multi-connection

7.1 High level functions description
7.1.1 eMMTel service function

The eMMTel service function is used to provide the user with enhanced MMTel service. It is a collection of
multiple service features, including enriched call, enhanced file transfer, enhanced content sharing,
enhanced messaging, etc.

7.1.2 Management function to support eMMTel service
The management function provides the capabilities to manage the eMMTel service and the multi-connection
network. It provides the eMMTel service with the expected level of quality, security and reliability.

7.2 Functional entities defined in the eMMTel service function

7.2.1 Network address book functional entity (NAB-FE)
NAB-FE is responsible for providing network storage to users' address books, and also the synchronization
function to users' terminals. It also provides a backup of the address book data on the user's terminal at the
network side. It allows users to download the backup data in case the phone is lost, replaced or the data is
migrated.

7.2.2 Presence and group management functional entity (PR-FE)
The PR-FE receives and stores users' presence information, and also manages the presence information. It
provides the user with the ability to subscribe to other users' presence information.

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