GL Enhances
Gn Gp Interface Emulator

24th, Dec 2017

Welcome to another November 2017 issue of GL's Newsletter providing information and insight into our enhanced Gn Gp Interface Emulator software referred to as MAPS™ UMTS Gn Gp Interface Emulator software. It has been enhanced with High density user-plane traffic simulation.



GL's MAPS™ Gn Gp Interface Emulator is an advanced protocol simulator/tester for SGSN & GGSN simulation over Gn, Gp interfaces that can simulate GPRS Tunnelling Protocol (GTP) signaling & Mobile application traffic as defined in 3GPP TS 29.060. The tester supports functional testing, error tracking, regression testing, and load testing/call generation. It can run pre-defined test scenarios against GTP interface test objects in a controlled & deterministic manner.

MAPS™ Gn Gp Interface Emulator supports powerful utilities like Message Editor, Script Editor, and Profile Editor which allow new scenarios to be created or existing scenarios to be modified using GTP messages and parameters.

GL's MAPS™ Gn Gp Interface Emulator benefits Network Equipment Providers of SGSN, and GGSN entities, with -

  • Accelerated time to market
  • Reduced development costs
  • Reduced project risk of internally-developed GTP applications

Call Generation


Call Generation at SGSN Node

Call Generation option allows the user to initiate Control plane-signaling procedures such as Create, Update and Delete PDP Contexts etc using proper scripts and profiles. The profile allows necessary parameters of signaling messages to be changed during runtime.

The MAPS™ Gn Gp acts as SGSN and initiates the GTP signal flow by "Create PDP Context Request" to the DUT (GGSN). A GTP tunnel is created during the PDP context procedure. The SGSN receives "Request Accepted" message and PDP context is activated as shown in the figure below. Also, simulates the complete GTP signal flow as in the specification (TS 29.060 V9.2.0 (2010-03)).

Call Reception


Call Reception at GGSN Node

Signaling Procedures initiated from other entity can be automatically detected in call reception window by pre-setting the required scripts in the Incoming Call Handler window.

This test is performed to ensure that the MAPS™ Gn Gp (GGSN) on receipt of a "Create PDP Context Request" message from SGSN, sends a "Create PDP Context Response" message to activate PDP context. A GTP tunnel is created during the PDP context procedure.

High Density Traffic Simulation

GL’s MAPS™ Gn Gp Interface Emulator with PacketLoad appliance supports massive simulation of UEs (up to 500000) with high density (up to 4 Gbps or 40 Gbps) mobile data traffic simulation for both UMTS, and LTE networks.

The solution allows encapsulating the generated packet data within GTP headers and transmitting through the gateway points such as SGSN & GGSN, or SGW & PGW. It allows simultaneous simulation of multiple sessions per user to verify bearer allocation bandwidth at the end points. Currently, the solution offers stateful TCP/HTTP, and PCAP Replay traffic types. PacketLoad supports HTTP traffic simulation with the base requirements such as port number, server IP address, and pre-canned HTTP traffic file.

PacketLoad is available in 2 variants:

1. PacketLoad 4 x 1Gbps
2. PacketLoad 4 x 10Gbps

Traffic Statistics

MAPS™ provides useful statistics to verify the simulated mobile data traffic. Users can customize the statistics for the generated stateful TCP/HTTP, and PCAP Replay and other Mobile Data traffic. Call Graph uses the results from statistics to plot graphically the Bandwidth on each port, HTTP latency, TCP Latency, and UE related statistics in form Bar/Line/Pie charts.

Link level

  • Link state/speed
  • ARP

Per Port

  • TX/RX Rate/s
  • Packets Sent/Received
  • Bytes Sent/Received


Payload Size via MSS (1B to 9400B)


  • ACK
  • FIN
  • RST
  • TCP/IP Checksum Errors

PCAP Replay

Packets Sent and Received


Packets Sent and Received


  • Connections Established
  • FW Addresses Not Blocked
  • URL HTTP Wrong Response RX

Main Features

  • Simulates SGSN and GGSN
  • Supports GTP Control plane
  • Generates million of Control Signaling (Load Testing)
  • Generates and processes GTP messages
  • Supports GTP Traffic (GTP User Plane Data) which includes: verification like BERT testing, HTTP traffic generation capability, GGSN can actually be connected to real IP network to simulate Gateway testing
  • Supports high bandwidth traffic generation with PacketLoad (Up to 40 Gbps)
  • Insertion of impairments to create invalid messages
  • Supports customization of call flows and message templates using Script and Message editors
  • Supports scripted call generation and automated call reception
  • Script based & protocol independent software architecture
  • Provides Call Statistics and Events Status


  • Provides fault insertion, and erroneous call flows testing capability
  • Functional testing, Regression testing and Conformance testing of network elements
  • Ready scripts makes testing procedure simpler, less time consuming and hence time to market products
  • QoS requests for greater or lesser bandwidth

Call Statistics


MAPS™ supports Bulk Call Simulation and Stress/Load Testing capabilities through Load Generation feature. Load Generation helps users configure Stress/Load Testing parameters such as Call per second (CPS) or Busy hour call attempts (BHCA), Max Simultaneous Calls and Burst parameters.

All call handling scripts (irrespective of the type of the functions) are assessed by MAPS™ to provide statistical information about Total Calls, Active Calls, Completed Calls, Passed Calls, Failed Calls, and Simultaneous Calls/Sec (CPS), and Calls/Sec . It is also possible to characterize the statistical information under different groups of call handling scripts under a unique heading.

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