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dsTest, Developing Solutions, SLg Interface, Location Serrvices, LCS Testing. MME Testing, GMLC Testing

dsTest supports the 3GPP Evolved Location Protocol (ELP) SLg Diameter interface on both the Mobility Management Entity (MME) client and the  Gateway Mobility Location Center (GMLC) server.  3GPP Location Services (LCS) are specified in 3GPP TS 23.271 and the SLg interface in TS 29.172.

Location-based services, such as Emergency Services, rely upon LCS. LCS are also used to optimize network performance and enhance network self-optimization. With the addition of the SLs and SLh interface applications, you can verify your end-to-end LCS solution.

Initiate Subscriber location requests from the GMLC and verify that the MME authenticates the request, retrieves the appropriate  information from the E-UTRAN and responds with the correctly formatted location information (current or last known) of the requested subscriber.dsTest, Developing Solutions, LCS, Location Based Services, SLs, SLg, SLh, MME, GMLC, HSS, E-SMLC, Location Services, LCS Testing

From the MME, initiate a subscriber location report, and verify that the GMLC acknowledges the message from the MME, correctly processes the information , transferring the correct information to your external LCS client.

Use the MME and GMLC nodes and the SLg Interface application to test Diameter Routing Agents (DRA), Proxies, Relay Agents, and Redirect Agents. dsTest provides more tools for Location Services EPC compliance testing.


The SLg Interface application implements the following ELP functions:

  • Provide Subscriber Location, in support of EPC mobile terminating positioning (EPC-MT-LR) procuedures;
  • Subscriber Location Report, in support of EPC mobile originating (EPC-MO-LR) and EPC Network Induced (EPC-NI-LR) procedures.

A complete set of events that can be generated with the SLg interface application can be found here, and our Diameter Dictionary can be used to construct and validate 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.

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 SLg 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 SLg measurements, Diameter measurements, and socket measurements.

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

Supporting Standards3GPP SLg Diameter Interface, Location Services (LCS)