Page 411 - 5G Basics - Core Network Aspects

Core network aspects 1

13) MUE1_IF(2) sends a connection update request message to MR-FE.

14) MR-FE updates the information of the connection based on the connection update request message,
and sends a connection information message to MC-FE.
15) MC-FE sends a transport resource modification request message, which contains the updated
information of the connections to MPC-FE.
16) MPC-FE returns a resource modification response message to MC-FE.
17) MC-FE makes policy rules based on QoS requirements, and then sends a request to MMF to install
the QoS rules.
18) MMF sends the new QoS rules to AC-FE.

19) AC-FE updates the QoS policy rules of the connection. Then it returns an ACK message to MMF.
20)-21) Then the video share data and image share data are transported from the MUE1_IF(2) to the MUE2.
22)-24) After the transfer is completed, MUE1 sends the SIP bye message to MUE2.
25)-27) MUE2 responds with a SIP OK message to MUE1.

9.3 Enhanced file transfer

9.3.1 Enhanced file transfer related to the call
The enhanced file transfer services during a voice call are linked to the call. In the multi-connection
environment, the CS voice call is set up in the CS network (the PS network also can be used for the voice call),
the file transfer service functions are independent of the voice call. The file transfer uses another connection
to transport the data. The information flow is shown as Figure 9-5.

Figure 9-5 – Enhanced file transfer related to the call

0) The CS voice call is set up in the CS network and the capabilities of both ends are known.
1)-4) MUE1 initiates the SIP invite process.
5)-8) MUE2 successfully responds with the SIP OK message.
9)-12) When the SIP OK message is received, the MUE1 transmits the ACK confirmation to the MUE2.

13) MUE1 transfers the file via MSRP to MUE2; the transmission is unidirectional.
14)-17) When the transmission is completed, MUE1 sends the SIP bye message to MUE2.

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