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S5 Interface, S8 Interface, dsTest, Developing Solutions, SGW, PGW, LTE Testing, EPC Testing

dsTest supports the GPRS Tunneling Protocol Version 2 for Control plane (GTPv2-C) message sets over the Evolved Packet Core (EPC) S5 or S8 interface between Serving Gateway (SGW) and the PDN Gateway (PGW). The S5/S8 Interface Application, along with dsTest interface applications such as S1, S6, and S11, provides dsTest users with complete EPC testing capability. Our eNodeB, MME, SGW, PGW, and Home Subscriber Server (HSS) emulators support end-to-end testing of IP connectivity to LTE access.

This interface application provides user plane tunneling and tunnel management between the SGW and the PGW. S8 is also the Inter-PLMN (Public Land Mobile Network) reference point providing user and control plane between the SGW in the Visited  (VPLMN) and the PGW in the Home PLMN (HPLMN).

Implementation

Path Management Messages

  • Echo Request
  • Echo Response
  • Version Not Supported Indication.

Tunnel Management Messages

  • Create Session Request/ResponseS5 Interface, S5 Message Flow, dsTest, Developing Solutions, MME, SGW, PGW< PCRF, eNodeB, GTP
  • Delete Session Request/Response
  • Modify Bearer Request/Response
  • Change Notification Request/Response
  • Create Bearer Request/Response
  • Update Bearer Request/Response
  • Delete Bearer Request/Response
  • Suspend Notification/Acknowledge
  • Update PDN Connection Set Request/Response
  • Delete PDN Connection Set Request/Response
  • Modify Bearer Command
  • Modify Bearer Failure Indication
  • Delete Bearer Command
  • Bearer Resource Command
  • Bearer Resource Failure Indication.

A complete set of events that can be generated with the S5/S8 interface application can be found here, and our GTPv2 Dictionary and GTP Cause Value Reference can assist in designing, configuring,  and interpreting GTPv2 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.

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.

Operational Measurements

dsTest provides rich sets of measurements for the S5/S8 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 S5/S8 measurements, control socket measurements, and user socket measurements.

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

Supporting StandardsS5/S8 Interface, PGW testing, SGW Testing, dsTest, Developing Solutions