Page 416 - 5G Basics - Core Network Aspects

1 Core network aspects

Appendix I

Scenarios for enhanced multimedia telephony services
(This appendix does not form an integral part of this Recommendation.)

I.1 Reliability and service continuity
The scenario in Figure I.1 shows that in multi-connection, if one of the connections is lost, then the eMMTel
service can use another connection to maintain the service without any interruption.
Alice initiates video share with Bob via the WLAN network connection. When the WLAN network connection
is lost, the network senses the change and starts delivering data over the 2G/3G network using the PS domain
without restarting the service session.

Figure I.1 – Scenario of reliability and service continuity

I.2 Bandwidth aggregation
The scenario in Figure I.2 shows that the eMMTel terminal can use multiple connections simultaneously to
receive the voice and file flows from another eMMTel terminal to get an aggregated bandwidth.
Alice initiates a CS voice call with Bob, and then she initiates a file transfer with Bob via the PS network.
However, the speed of the file transfer is low, so she sets up the WLAN access to achieve a wider aggregated
bandwidth in order to improve the situation.

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