Page 325 - 5G Basics - Core Network Aspects

Core network aspects 1

Figure 7-2 – MUE initiated FSC

0. The MUE is connected simultaneously to multiple access networks and it is using multiple
connections to send and receive IP flows.
1. The MUE sends a connection update request message to the multi-connection registration
functional entity (MR-FE). The message contains the routing rules requested by the MUE.
2. The MR-FE updates the information of the connection by using the connection update request
message. Afterwards the MR-FE sends a connection information message to the multi-connection
coordination functional entity (MC-FE).

3. The MC-FE sends a transport resource modification request message to the MPC-FE. This message
contains the updated routing rules for the MPC-FE.

4. The MPC-FE rejects or accepts the routing rules according to subscription data and modifies the
corresponding policy rules.
5. The MC-FE makes and assigns related rules for access network for the multi-connection media
function (MMF). In this way, the MMF installs the suitable rules.
6. The MMF sends the new routing rules to the AC-FE(2).
7. The AC-FE(2) updates the routing rules of the connection. Afterwards, it returns an ACK message to
the MMF.
8. The AC-FE(2) performs the transport resource activation procedure or modification procedure
indicating which routing rule has been accepted.
9. Resource release or modification procedures are finally executed, so the associated resources to the
flows can be removed.
7.4.2 Network initiated FSC

The multi-connection FSC operates in network-initiated mode in the following manner. Based on the current
status of an access network, one of the existing IP flows is moved from one access network to another

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