Page 1390 - 5G Basics - Core Network Aspects

3 Signalling aspects

The BNG as a central node chains all the network services.

One possible scenario of this kind of service route path is the video caching system. First, the video caching
network service identifies the video caching server in which the intended video is cached. Then this
information associated with the packet is sent back to the BNG. Finally, the packet is redirected to the video
caching server.

A.1.2 Lily service route path
Some network services are highly coupled with each other or have the ability to specify the next network
service for this packet handling.

Figure A.3 – Scenario of Lily service route path

As depicted in Figure A.3, the decision about which network service a packet should go to is made by the
network service itself. Each packet goes directly to the next network service for handling and it does not need
to go back to the BNG. The packet should contain a certain flag for specifying the route path. As the service
route path looks like the shape of a lily, it is called the Lily service route path.

In the Lily service route path scenario, each network service should have the ability to route a packet to the
next destination. Certain message, information or metadata should be conveyed between network services.

The service route path is chained together by multiple network service nodes.
One possible scenario of this kind of service route path is the parental control network service. Suppose the
parental control network service is composed of two smaller network work service entities, the URL filtering
network service and the HTTP redirect network service. After the URL filtering network service's handling,
the permit or deny information with the packet is handed directly to the HTTP redirect network service. With
the permit or deny information, the HTTP redirect network service will make the judgement, and finally
redirects the packet to the blocking page in case it is not permitted, otherwise to the web server specified.
A.1.3 Hybrid service route path

The hybrid service route path combines the Chrysanthemum service route path with the Lily service route
path when needed.

Figure A.4 – Scenario of Hybrid service route path

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