Page 381 - 5G Basics - Core Network Aspects

Core network aspects 1

15) MSCD-FE sends an initiation request message for SC-3 to MUE-C.

16) MUE-C returns an initiation response message for SC-3 to MSCD-FE.
17) The streaming component of SC-3 is delivered from MSCD-FE to MUE-C through multiple networks.

9.4 Streaming transfer
After establishment, a streaming flow can be transferred from one connection to another among multiple
connections, according to the subscriber's demand or network status, while the streaming service itself is not
affected.
9.4.1 MUE initiated streaming transfer

After simultaneously connecting to multiple access networks, according to a subscriber's demand
(for example, if the bit rate of the connection for the streaming transmission is too slow), a MUE can request
the transfer of one or more streaming flows from one access network to another. In this case, the MUE is
able to request a modification of the existing connection parameters. The information flow of a MUE initiated
transfer is shown in Figure 9-4.

Figure 9-4 – MUE initiated streaming transfer
1) MUE sends a streaming transfer request message to the originating SCF, i.e., SCF(1), to request to
transfer a streaming flow from one access network to another.
2) SCF(1) forwards this request message to MAS-F.
3) MAS-F obtains MUE and streaming flow related information from MUP-FE and MSUP-FE.
4) MAS-F makes the decision which connection can be used to transport the streaming flow to be
transferred, according to the information already obtained.
5) MAS-F sends a resource modification request, which contains the updated information of the
connection, to the destination SCF, i.e., SCF(2).
6) SCF(2) forwards this request message to MPC-FE.
7) MPC-FE makes policy rules based on QoS requirements, then sends a request to MMF to install the
QoS rules.

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