Page 270 - 5G Basics - Core Network Aspects

1 Core network aspects

5) MPC-FE selects a set of QoS rules for the new connection based on the operator policy and the
information of the new connection. And then MPC-FE makes out the policy for the MUE ongoing IP
flows based on the policies and sends to MC-FE;
6) MC-FE sends an ACK message to MPC-FE after receiving the policy rules;
7) MC-FE sends a Response message to MR-FE;
8) MR-FE binds between the MUE and new connections and sends a Connection Update
Acknowledgement message to the MUE.

IV.2 Removing a connection
When an MUE moves out of the coverage of an access network, it is required to remove all IP flows associated
with that access network and detaches from that access network. Figure IV.2 shows an abstract flow for
deleting or updating a connection.

MUE AC-FE MR-FE MC-FE MPC-FE

1. Connection update request
2. New connection
information
3. Transport resource
modification request
Policy decision
procedure
4. Policy rules
delete/update

5. ACK
6. ACK
7. Connection update
acknowledgement

Y.2027(12)_FIV.2

Figure IV.2 – Deleting or updating a connection

1) The MUE sends a Connection Update Request message to MR-FE. The message contains the
identifier of the connection to be deleted;
2) MR-FE deletes the associated connection information based on the Connection Update Request
message. And then MR-FE sends a New Connection Information message which contains the
available connections of the MUE to MC-FE;
3) MC-FE sends a Transport Resource Modification Request message to MPC-FE;
4) MPC-FE controls transport resource based on the Transport Resource Modification Request, and
then sends a QoS Policy Rules Delete/Update message to MC-FE;
5) MC-FE receives the QoS Policy Rules Delete/Update message and then returns an ACK message to
MPC-FE;
6) MC-FE returns an ACK message to MR-FE;
7) MR-FE binds between the MUE and new connections and returns a Connection Update
Acknowledgement message to the MUE.

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