Page 1379 - 5G Basics - Core Network Aspects

Signalling aspects 3

application programming interfaces (APIs) for the network services deployed on it and delivers network
service controls to the BNG. The frequently changing network services are decoupled from the BNG to the
external service platform, and the frequently changing network services may be the ones that are related
with service properties. Network service can be easily deployed on the service platform with the APIs
provided by the service platform.

Figure 1 – Architecture for BNG with flexible network service combination

Network services control the BNG through the service platform and the BNG acts based on the
action/commands from the network services. Packets will be processed in the intended sequence by the
network services deployed on the service platform.
With this independent feature of the network services, the network services can be easily developed and
deployed on the service platform. Moreover, the network services can be combined and chained flexibly to
meet the service handlings on demand.
Signalling between the service platform and network services is not included in this Recommendation.
Signalling between the service platform and the BNG is stressed in clause 7 and a concrete scenario of service
and user awareness is illustrated in Annex D.

7 Signalling requirements of the BNG

7.1 Service route path, service combination and orchestration

The service platform should install the service route path to the BNG. Then packet(s) can be processed by the
network services in the intended sequence. With the intended route path, service combination and
orchestration on the BNG will be achieved.
The detailed scenarios and requirements are stated in Annex A.

7.1.1 Message types

As illustrated in Annex A, the service platform provides APIs/software development kits (SDKs). The services
or the orchestration layer uses the APIs/SDKs for service chaining, service combination and orchestration.
For the service management, the message types in Figure 2 should be followed.

As depicted in Figure 2, all the message interactions between the services platform and BNG are in request
and response mode. The request messages may be for service creation, service deletion, service chaining,
service unchaining and service updating. The response message contains the handling result of the
corresponding requests and parameters to be returned to the service platform.

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