Page 1383 - 5G Basics - Core Network Aspects

Signalling aspects 3

5) Service-Id uniquely identifies the service node that 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-Instance-Id is optional. If the service instance ID is not provided, it means that only
one service instance is running in the service node.

The response message to the CHS-REQ message is defined as the chain service response (CHS-RSP) message.
The CHS-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 CHS-REQ message.
Message Format:
< CHS-RSP-Message > ::= < Message Header >
{ Service-Platform-Id }
{ BNG-Id }
{ Result }
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 result of chaining up services.
7.1.2.4 Unchain service request message and response message

The unchain service request (UCHS-REQ) message, indicated by the message type in the message header
field, is sent by the services/service orchestrator to unchain the service chains set up by CHS-REQ message,
i.e., stopping steering flow traffic to the specified service handlers.
Message format:

< UCHS-REQ-Message > ::= < Message Header >
{ Service-Platform-Id }
{ BNG-Id }
{ User-Id }
*{ Flow-Description }
{ Service-Id }
{ Service-Location }
{ Service-Instance-Id}

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 this 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 fields;
5) Service-Id uniquely identifies the service node that 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-Instance-Id is optional. If the service instance ID is not provided, it means only one
service instance is running in the service node.
The response message to the UCHS-REQ message is defined as the unchain service response (UCHS-RSP)
message.
The UCHS-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 UCHS-REQ message.

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