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dsTest, Developing Solutions, S6 Interface, S6a Interface, S6d Interface, HSS, MME, SGSN. AuthenticationdsTest supports Home Subscriber Server (HSS)/Equipment Identity Register (EIR) emulation and Mobility Management Entity (MME) and Serving GPRS Support Node (SGSN) simulation capabilities for the 3GPP Diameter S6 Interface. Test MME and SGSN S6 interfaces in LTE networks with our HSS Server Emulator. Use the S6 Interface application on our SGSN and MME simulator nodes to test the capacity and performance of an HSS. Test VoLTE  and PCC  interactions by using the S6 Interface Application with other  dsTest  Interface Applications such as Gx, Rx, Ro, and Rf. Use the HSS Emulator and S6 Interface application in tandem to test Diameter protocol compliance, functionality and capacity of Diameter Routing Agents (DRA), Proxies, Relay Agents, and Redirect Agents. dsTest can also surround a CIoT Serving Gateway Node (C-SGN) with all the interfaces needed to verify the MME functions required of the C-SGN.

dsTest provides tools for compliance and functional testing of Diameter interfaces.


The S6 application implements the following 3GPP EPC procedures:

  • Update Location
  • Cancel Location
  • Purge UE
  • Insert Subscriber Data
  • Delete Subscriber Data
  • Authentication Information Retrieval
  • Reset
  • Notification

A complete set of events that can be generated with the S6a/S6d interface application can be found here and our Diameter Dictionary can be used to help construct, test, validate, and interpret results of your Diameter testing.

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 HSS Emulator provides Mobile Subscriber data repository, authentication information, and routing information services for the S6a and S6d interfaces—all of the functionality required by an MME or an SGSN plus all of the benefits of an emulator. Reconfigure your subscriber database in seconds rather than hours by simply loading a new configuration file.

Execute timed chains of test events with a run-time command or during an automated test to trigger HSS-initiated procedures:

  • Cancel Location;
  • Insert Subscriber Data;
  • Delete Subscriber Data;
  • Reset.

You can use the control interface to change the emulator’s behavior:

  • Simulate a non-responsive server by pausing the emulator;
  • Simulate intermittent issues by pausing and resuming;
  • Disable individual subscribers during the test run, generating unknown subscriber errors.

One HSS Emulator can support any mixture of interfaces, up to 1000 client connections. Using concurrent interfaces also enables interaction between the interfaces:

  • Multiple S6a interfaces enable support for MME-MME mobility;
  • S6a and S6d interfaces enable support for MME-SGSN mobility.

Add functionality to your HSS Emulator by adding interfaces such as S13 for EIR emulation, and Gr for support for 3G/4G mobility and evolution testing.

Multiple HSS Emulators can be instantiated on a single server. In this mode each emulator can support multiple interfaces, up to an aggregate of 1000 client connections across all emulators. The emulators are fully independent and their subscriber databases may also be independent, overlap, or be duplicated.

Read more about our HSS Emulator.

HSS Testing (Client Simulation)

The S6 Interface application simulates an MME’s S6a interface or an SGSN’s S6d interface to determine the impact of new HSS features and standards before they are deployed in a network.

The S6 Interface application also allows you to validate HSS 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 client-initiated procedures.

  • Start and stop specified subscriber sessions, simulating real-world authentication activity;
  • Initiate Update Location procedures;
  • Notify the server that a subscriber’s profile has been deleted or that subscription data has changed.

Multiple SGSN and MME emulators can be instantiated on a single server, each with scalable subscriber loads and transaction rates. In this mode the S6 interfaces of up to 1000 independent MME and SGSN nodes may be simultaneously running and mobility may be simulated. The nodes are fully independent and their subscriber configurations may also be independent, may overlap, or may be duplicated.

Read more about our testing solutions..

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 currently. 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 S6 interface:

  • 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 S6 measurements, Diameter measurements, and socket measurements.

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

Supporting Standards