Page 269 - 5G Basics - Core Network Aspects

Core network aspects 1

Appendix IV

Information procedures of multi-connection
(This appendix does not form an integral part of this Recommendation.)

This appendix provides information procedures related to multi-connection.

IV.1 Initiating/adding a new connection
If an MUE is using multiple connections to receive and send flows, it is recommended that changes of the
connections, such as adding a new connection, change the IP flow routing path. This appendix describes the
high-level information flows triggered by the changes of multiple available connections in the MUE.

When an MUE moves into the coverage of a new access network and successfully completes authentication,
the MUE can use the access network to send and receive packets. Before the MUE uses the new connection,
it is required to register the new connection to MR-FE. Figure IV.1 shows an abstract flow when a new
connection is added.

MUE AC-FE (1) AC-FE (2) MR-FE MC-FE MPC-FE

0. Access
authentication

1. Access authentication
2. Connection update request
3. New connection
information
4. Transport resource
modification request
Policy decision
procedure

5. Policy rules
6. ACK
7. Response
8. Connection update acknowledgement

Y.2027(12)_FIV.1

Figure IV.1 – Adding a new connection

0) An MUE accesses an access network via AC-FE (1) through the access authentication process. After
the successful access authentication, the MUE will get an IP address for the interface connecting the
access network;
1) After detecting a new available access network, the MUE starts the authentication process via AC-FE
(2) and get a new IP for it;
2) The MUE sends a Connection Update Request message with the new IP address to MR-FE to register
a new connection;
3) MR-FE updates the available connections of the MUE and sends a New Connection Information
message which contains the available connections of the MUE to MC-FE;
4) MC-FE sends a Transport Resource Modification Request message to MPC-FE;

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