Page 1381 - 5G Basics - Core Network Aspects

Signalling aspects 3

3) Message transaction ID: generated by the sender of the message. If there is a response/reply
message for the request message, the transaction IDs of the request and response/reply messages
should be the same.
7.1.2 Message format

7.1.2.1 Create service request message and response message
The create service request (CS-REQ) message, indicated by the message type in the message header field, is
sent by the services/service orchestrator to create a service instance.

Message format:
< CS-REQ-Message > ::= < Message header >
{ Service-Platform-Id }
{ BNG-Id }
{ User-Id }
*{ Flow-Description }
{ Service-Id}
{ Service-Location }
*{ Service-Attribute }
Meanings and explanations:
1) Service-Platform-Id uniquely specifies the service platform;
2) BNG-Id uniquely specifies the BNG element;
3) User-Id uniquely identifies the user/application that created the service;
4) Flow-Description distinguishes the flows to be handled. This contains several fields from
network flows. The flow description may be fields in the packet headers, and in some cases, the L4-
7 information may be needed. There may be multiple flow descriptions items;
5) Service-Id uniquely identifies the service node, which provides the specified services;
6) Service-Location defines the location of the service node, so that the service platform can
locate the service node;
7) Service-Attribute is used for the service attributes associated with the service node or the
service instance. There may be multiple service attribute items.
The response message to the CS-REQ message is defined as the create service response (CS-RSP) message.

The CS-RSP message, indicated by the message type in the message header field, is sent by the BNG to the
service platform in response to the CS-REQ message.

Message format:
< CS-RSP-Message > ::= < Message Header >
{ Service-Platform-Id }
{ BNG-Id }
{ Result }
*{ Service-Instance-Id }
Meanings and explanations:

1) Service-Platform-Id uniquely specifies the service platform;
2) BNG-Id uniquely specifies the BNG element;
3) Result shows the handling results of creating service instance;
4) Service-Instance-Id uniquely identifies the service instance created.

7.1.2.2 Delete service request message and response message
The delete service request (DS-REQ) message, indicated by the message type in the message header field, is
sent by the services/service orchestrator to delete a service instance.

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