Page 1409 - 5G Basics - Core Network Aspects

Signalling aspects 3

8 The signalling requirements of SBAN

8.1 Overview of signalling requirements

For controlling the SBAN network, the messages over the southbound interface and the northbound interface
are classified by the following three categories.
Category 1: Registration
1-1 (southbound) SBAN Node Register message and response message;
1-2 (southbound) SBAN Node Port Register message and response message;

1-3 (northbound) SDN application Register message and response message.
Category 2: Status query
2-1 (southbound) SBAN Node Status Query message and response message;
2-2 (southbound) SBAN Node Port Status Query message and response message;

2-3 (southbound) SBAN Flow Query message and response message;
2-4 (northbound) SDN application Status Query message and response message;
2-5 (northbound) SBAN Network Query message and response message;
2-6 (northbound) SBAN Network Service Query message and response message.

Category 3: Service creation
3-1 (northbound) SBAN Network Service Initiation message and response message;
3-2 (southbound) SBAN Flow Initiation message and response message.
NOTE – No transport protocol for the signalling messages is specified here. No message content format is specified here
either.
The signalling messages may be extensible markup language (XML)-based messages over (or carried by)
transmission control protocol (TCP), user datagram protocol (UDP), stream control transmission protocol
(SCTP), transport layer security (TLS), etc. All of the messages consist of the message header and the message
body.

The message format is described in Figure 8-1 as follows:

Figure 8-1 – Message composition

The message header field contains the following information:
1) Message type: uniquely specifies the type of message;
2) Message length: specifies the length of the message body;
3) Message transaction ID: generated by the sender of the message. If there is a response message for
the request message, the transaction IDs of the request and response messages are the same.
The message body field contains the message contents.

8.2 Signalling requirements for southbound interface
8.2.1 Signalling requirements for registration

8.2.1.1 SBAN Node Register message and response message
The SBAN Node Register message is defined as SBAN-RE message.

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