Page 390 - 5G Basics - Core Network Aspects

1 Core network aspects

Appendix I

Scenarios of streaming services over multi-connection
(This appendix does not form an integral part of this Recommendation.)

I.1 Video services
Video services mainly include live video and video on-demand (VoD). Live video relies on the Internet and
streaming technology. It integrates images, text, voice and other elements. VoD, as the name suggests, is a
video on demand service responding to viewers' requests of programmes. This service can transport the
video content to users as clicked or selected.

In the environment of multi-connection, the advantages of multi-connection such as increasing service
continuity can be used to enhance the video service. For example, benefiting from multi-connection
technology, the video service will not be interrupted even if one or more of the connections are lost. Instead,
other available connections can be used to maintain the continuity of the service. Figure I.1 is an example for
VoD continuity.

Figure I.1 – VoD service continuity

Alice has both a 3G connection and WLAN connection in her home. She uses a VoD service which establishes
two connections through 3G and WLAN simultaneously, since a broad bandwidth is required for video
delivering. After a while, she leaves home and moves out of the area of WLAN. WLAN connection is then lost.
The service senses the change and automatically starts delivering video streaming over the 3G connection
without pausing or stopping the service. Alice is informed of the change by the service or by the network.

I.2 Video conference services
Video conference services mainly include video conference, video chatting, tele-education and so on. Video
conference is a kind of communication method. It is held among different users with terminals in different
places, by communicating with voice, video and images in real time. The participators can feel the
communication just as face-to-face conversation. In fact, it can be used to replace onsite meeting.

In the environment of multi-connection, the advantages of multi-connection, such as multimedia division
and load sharing between networks, can be used to enhance this kind of service. For example, benefiting
from multi-connection technology, video conference services can be divided into audio flow sand video flows,
and then be delivered through different transmission paths in different networks. Figure I.2 is an example of
video conference service.

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