Page 380 - 5G Basics - Core Network Aspects

1 Core network aspects

Figure 9-3 – Streaming composition

1) UE-A sends an initiation request message to SCF-A to create a streaming component (SC-1).
2) UE-B sends an initiation request message to SCF-B to create another streaming component (SC-2).
3) SCF-A forwards the initiation request message of SC-1 to MAS-F.
4) SCF-B forwards the initiation request message of SC-2 to MAS-F.
5) MAS-F obtains related information (such as the UE that the messages come from, the applications
that the messages belong to, etc.) from MUP-FE and MSUP-FE, to decide whether the streaming
components (SC-1 and SC-2) can be composed together.
6) MAS-F makes the composition decision according to the information already obtained.
7) MAS-F composes SC-1 and SC-2 as SC-3.
8) MAS-F sends a streaming composition notification request message to MSCD-FE, to request to
compose the streaming components (i.e., SC-1 and SC-2).
9) MSCD-FE returns a streaming composition notification response message to MAS-F.
10) MAS-F returns an initiation response message for SC-1 to SCF-A.
11) MAS-F returns an initiation response message for SC-2 to SCF-B.

12) SCF-A forwards the initiation response message of SC-1 to UE-A.
13) SCF-B forwards the initiation response message of SC-2 to UE-B.
14) The streaming components (SC-1 and SC-2) are transported from UE-A and UE-B respectively, to
MSCD-FE through different networks.

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