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dsTest SGD/Gdd Application Nodes

dsTest supports both server emulation and client interface simulator capabilities for the 3GPP LTE SGd/Gdd Diameter interface. Use our SGd/Gdd Interface application on our simulated Mobility Management Entity (MME) or Serving GPRS Support Node (SGSN)  to test the capacity and performance of a GMSC. Use our GMSC Emulator with the SGd/Gdd interface application to test your MME and/or SGSN. If you are testing CIoT/NB-IoT, dsTest can surround a CIoT Serving Gateway Node (C-SGN) with all the interfaces needed to verify the MME, SGW, and PGW functions required of the C-SGN.

The SGd and Gdd reference points are stateless, and are specified in 3GPP TS 29.338.

Read more about our CIoT test solution.


The SGd/Gdd application implements the following 3GPP procedures:

  • MO Forward Short Message (OFR/OFA)
  • MT Forward Short Message (TFR/TFA)
  • Alert Service Center (ALR/ALA)

A complete set of events that can be generated with the SGd/Gdd interface can be found here, and our Diameter Dictionary can help verify your SGd/Gdd test scenarios.

As with all dsTest products, the node configurations and test scenarios are easily defined and configured with XML files that are validated against a published XML Schema to avoid invalid definitions. With our dsClient GUI, you can create, run, and archive tests, capture, graph and archive operational measurements, capture real-time data flows, and manage your dsTest servers and testing scenarios with a standalone application that runs on your PC.

MME/SGSN/C-SGN Testing (Server Emulation)

The GMSC server emulator initiates the appropriate procedure when appropriate, eliminating the need to dedicate a production server to lab activities. You can manually trigger server-initiated procedures such as Alert Service Center by executing a event chain with a run-time command or during an automated test.

Read more about our GMSC Emulator.

GMSC Testing (Client Simulation)

Our SGd/Gdd Interface application simulates a MME/SGSN SGd/Gdd interface to determine the processing capacity and performance of a GMSC. The SGd/Gdd Interface application allows users to validate GMSC performance and capacity in a realistic network environment, replicating the deployment configuration. Execute timed chains of test events with a run-time command or during an automated test to trigger procedures initiated by the GMSC.

A single server can host multiple client simulators, each with scalable subscriber loads and transaction rates. In this mode the SGd/Gdd interfaces of up to 1000 independent client nodes may be simultaneously simulated. The nodes are fully independent and their subscriber configurations may also be independent, overlap, or be duplicated.

Advanced Testing Features

SmartEvents — Alter application behavior or coordinate multiple interface applications with SmartEvents. Our programmable, subscriber-level state machine gives you the ability to define handlers for specified application events that can then cause an event in another application to be executed. You can also configure handlers to modify subscriber information during run-time, introduce timers, or randomize subscriber behavior based on configurable probabilities to name a few of the many options in one of dsTest’s most powerful features.

SmartMessageElement — Insert, delete, or replace elements in Diameter, RADIUS, MAP, LDAP, GTP, REST, or SOAP messages with our SmartMessageElement solution. Define proprietary signaling or corrupt elements to facilitate negative testing. You can specify when your elements are used with SmartEvents.

Traffic Profile — Draw the shape of your test actions across time with Traffic Profile. You can define the rate for any action as a static rate or reference a Traffic Profile configuration, which also means that multiple Traffic Profiles can be running concurrently. Use Traffic Profile in conjunction with the randomizing features in SmartEvents to design a test that more truly simulates real-world network activity.

Diameter Dictionary — Define a set of message templates against which all messages will be validated with our Diameter Dictionary. Whether you’re load testing or testing functionality all messages are validated.

Operational Measurements

dsTest provides rich sets of measurements for the SGd and Gdd interfaces:

  • Transaction and transport layer attempts, successes, and failures
  • Transaction duration, transactions-per-second, and round-trip delay
  • Message and byte counters
  • Errors encountered and error indications received in messages

See our Online Help for SGd/Gdd measurements, Diameter measurements, and socket measurements.

You can read more about the reporting features offered with dsTest and dsClient here.

Supporting Standards