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dsTest, Developing Solutions, SLs Interface, LCS Testing, MME Testing, E-SMLC Testing

dsTest supports the procedures and information coding of the 3GPP LTE Location Services Application Protocol (LCS-AP) that are needed to support the Location Services (LCS) in E-UTRAN. The SLs interface is supported on both the Mobility Management Entity (MME) client and the Evolved Serving Mobile Location Center (E-SMLC) server. LCS is specified in 3GPP TS 23.271 and SLs interface in 3GPP TS 29.171.

Location based services, such as Emergency Services, rely upon LCS. LCS are also used to optimize network performance and enhance network self-optimization.

Control-plane based positioning services rely upon the E-SMLC to calculate the position of a device upon a request from a GMLC. From the MME, initiate a location request, and verify that the E-SMLC acknowledges the message from the MME, correctly processes the information, transferring the correct location information back to the MME. Verify that your E-SMLC correctly interrogates the E-UTRAN for the location of the specified User Equipment (UE). dsTest provides more tools for Location Services EPC compliance testing.


Developing Solutions’ LCS solution includes the following interfaces/protocols in the EPC:

  • SLs between the MME (client) and  E-SMLC (server)
  • Diameter-based SLg between MME (client) and the GMLC (server)
  • Diameter-based SLh between the GMLC (client) and HSS (server)
  • LTE Positioning Protocol (LPP)
  • LTE Positioning Protocol Annex (LPPa)

For the SLs interface, the following procedures are available:

  • Location Request (MME –>E-SMLC)
  • Location Estimate Response (E-SMLC –> MME)
  • Provide Location Request (E-SMLC –> MME)
  • Reset Request
  • LPP Provide Capabilities
  • LPP Request Assistance
  • LPP Provide Location
  • LPPa Request Location
  • LPPa OTDOA Location Request
  • LPP Request Capabilites
  • LPP Provide Assistance
  • LPP Request Location

A complete set of events that can be generated with the SLs interface application can be found here.

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.

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.

Operational Measurements

dsTest provides rich sets of measurements for the SLs 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 LPP measurements, LPPa measurements, and socket measurements.

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

Supporting Standards