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The GTP' agent collects from GSM agents messages and datagrams of charging protocol of type GTP'. By collecting this information the GTP' agent enables Image Modified to act as a Charging Gateway device, providing Charging Gateway Functionality (CGF) within UMTS/GPRS networks.

 Image Modified supports UMTS/GPRS Charging Gateway Functionality

The GTP' agent awaits initialization from the GSN nodes of the types SGSN and GGSN. When initiated, there are two protocols with which the Agent can interact with the nodes:

• Transmission Control Protocol(TCP), and

• Datagram Protocol(UDP)

A GTP' workflow can alternate the implementation of two different protocols by using two GTP' agents. One for each protocol.

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The agent counts the received requests and publishes those values as MIM values. Those MIM values can also be viewed from the command line tool with the wfcommand printcounters command.

The GTP' agent supports IPv4 and IPv6 environments.

Interaction Scenario

The following scheme demonstrates the message and data transfer between the GSN nodes and the GTP' agent when using UDP:
 

1. When started, the GTP' agent sends a Node Alive Request message to all configured GSN nodes.
    

2. The GTP' agent awaits a Node Alive Response and will transmit Node Alive Request repeatedly, according to the Advanced tab settings. For further information see Advanced Tab in GTP' Agent Configuration.
    

3. After a successful Node Alive Response the GSN node starts to transmit Data record Transfer Requests to the agent. When safely collected, the agent replies with a Data record transfer Response.
    

4. When the workflow is stopped, the message Redirection Request is automatically sent to all configured GSN nodes. The workflow will not stop immediately but waits for a Redirection Response from each of the GSN nodes. If

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1. the Max Wait for a Response (sec) value is exceeded, the workflow stops, regardless of whether Redirection Response from the GSN nodes have been received or not.
   

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Prerequisites

The reader of this information should be familiar with:

• GPRS Tunneling Protocol (GTP) across the Gn and Gp Interface [3GPP TS 29.060 V4.2.0]:http://www.3gpp.org/ftp/Specs/archive/29_series/29.060/29060-420.zip

• Call and event data for the Packet Switched (PS) domain [3GPP TS 32.015 V3.11.0]: http://www.3gpp.org/ftp/Specs/archive/32_series/32.015/32015-3b0.zip

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