Page 405 - 5G Basics - Core Network Aspects

Core network aspects 1

8.5 Requirement for transport function (TF)

The following requirements are required for the TF to support eMMTel:
1) Authenticate and authorize subscribers' access to the network.
2) Report available access network resources to the MC-FE during initiation, addition, removal,
composition and decomposition of connections in each access network.
3) Collect and process the multi-connection charging and accounting information.
4) Protect against unauthorized use of the multi-connection capability.
5) Provide data integrity and data confidentiality in case the data of an application is delivered through
several connections.
6) Provide protection of transferred data in one connection from the attack of another connection.
7) Monitor the status information of currently active access networks and forward that information to
the MC-FE.
8) Support access network selection.
9) Support delivery of different service components over different access networks simultaneously.

10) Support service continuity in case multiple access networks are connected to UE.
11) Support switching from one subscriber's UE to another.

8.6 Requirement for MUE
The following requirements are required for the MUE to support eMMTel:

1) The service discovery mechanism. This requirement is vital to eMMTel. The service discovery
enables a user to be aware of the subset of eMMTel services which are available to access.
2) Configuration of eMMTel service. eMMTel services can only be initiated once the MUE is configured.

3) Establishment, release and modification of all connections in the multi-connection network.
4) Management of all connections, and provision of unified control to support the multi-connection
use cases, e.g., load balance.

5) Identification of each connection belonging to itself.
6) Provision of access network information.
7) Mapping of IP flows to the different access network connections.
8) Classification of IP flows, their identification and their binding to the proper connections.
9) Adjustment of packet rates for the different IP flows belonging to the same application among
different connections, especially when services are decomposed.
10) Service continuity during service transfer.

9 Information flow

9.1 Enriched call

9.1.1 Enriched call composition
When a MUE creates several enriched call composition service components through multiple network
interfaces, the service components can be composed into one to serve application and the remote UE. MUE1
and UE2 would establish the video call. During the call session, there are two service components for MUE1,
which are through different networks and interfaces. There is only one service component for UE2. The
detailed information flow is shown as Figure 9-1.

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