Product Showcase
LTE-IMS Network Test Solutions


Wireless networks can impair voice quality by various means including poor mobile phone quality, voice compression and decompression algorithms, delay, loss or gain in speech levels, noise, acoustic echo, and other distortions. GL's LTE-IMS Test Suite provides a complete solution to monitor, simulate, and troubleshoot problems over LTE-IMS networks.

GL's LTE-IMS Analyzer is capable of capturing, decoding and performing various test measurements across various interfaces over LTE and IMS networks. GL's Message Automation and Protocol Simulation Platform (MAPS™) - a multi-protocol and multi-interface simulation software can be used to simulate almost all elements in the wireless 4G VoLTE networks. Our latest High Density LTE Network Simulator can now generate massive number of UEs (up to 500000) along with high volume of mobile GTP and packet traffic to load test core LTE networks. One can also setup a virtual real-time network simulating all the network elements using ‘MAPS™ 2G 3G 4G Wireless Lab Suite', 5G Coming Soon!

What makes GL tools unique?

  • Script-controlled simulation of wireless networks
  • Unllimited ability to edit signalling messages, protocol fields, and call flows
  • Flexible architecture is independent of any protocol or network, which makes cross-domain testing easy
For more details, visit LTE and IMS Test Solutions.
4G LTE Communications
Network Lab
GL offers an End-to-End 4G LTE-IMS Communications Network Lab (CNL) with all components such as eNodeB, MME, Serving Gateway, PDN Gateway, HSS, SGSN, PCRF, PCEF, AF and others to simulate both E-UTRAN and EPC (Evolved Packet Core), allowing complete testing of the LTE network.

All functionalities conform to industry standards. The CNL provides reliable integrated solutions to vendors and service providers for simulation, monitoring, troubleshooting the wireless networks. Some of the real-time scenarios that can be realized with GL’s 4G LTE-IMS Lab solution are listed below -
  • SIP call between two LTE UEs using a SIP client installed on each UE (using third party SIP Call Agents)
  • SMS sent from a roaming 3G UE to a roaming LTE UE
  • CS fall back (CSFB) call from a roaming LTE UE and a roaming UMTS UE
  • VOLTE/IMS call from a roaming LTE UE to a roaming LTE UE on a different network
  • User Equipment - to - User Equipment Call Emulation Lab
  • Mobile Traffic and Web Access Emulation Lab
  • Inter and Intra Handovers
  • Interfaces Supported
    • S1, S3, S4, S11, S5/S8, S10, S16, X2, SLs, SGs
    • Diameter-S6a, S6d, S13, Cx/Dx, Gx, Rx & SGi
Simulation of IMS Interfaces

MAPS™ IMS supports simulating multiple UEs and IMS core elements such as P-CSCF, I-CSCF, S-CSCF, PCRF, MGCF to test multiple interfaces in the IMS core network such as - Cx/Dx, Rx, Gx, Gm, Mw, SGi, Mi, and Mj. With the help of real mobile phones, and other simulated elements, the application allows for making real-time VoLTE calls and also for testing interworking of LTE-IMS with PSTN and VoIP networks. 

MAPS™ Diameter can simulate S6a, S6a, S13, S13’, Cx/Dx, Gx, Gy,Rx, SLg, SLh and Gy interfaces and test functionalities of network elements such as -  MME, HSS, AF, AS, PCRF, CSCF, SGSN, PCEF, EIR, PDN GW, CTF, and OCS. MAPS™ Diameter is also enhanced to simulate Location Service (LCS) based SLh and SLg interfaces between the GMLC <-> HSS and GMLC <->MME.

Following test scenarios can be realized using MAPS LTE and IMS simulators -
  • UE Non-Roaming Registration
  • Voice Call between Non-Roaming Users on the same network
  • Voice Call between Non-Roaming User to Non-Roaming User across networks
  • Voice Call from IMS to PSTN Network
  • UE Roaming Registration
  • 3G-to-3G Roaming User SMS Service
  • SMS Service between roaming 4G to 3G via CSFB (SGs)
  • Voice call through IMS Network between 4G and 3G users
  • Use of CAMEL for SMS and Prepaid Calls
  • Streaming Online Video from a Roaming 3G/4G UE
Centralized Web-based LTE
Monitoring System

GL's NetSurveyorWeb™ is based on a scalable and flexible architecture. It is used in conjunction with GL's LTE Protocol Analyzer and IMS Protocol Analyzer probes to non-intrusively monitor the entire network from a central remote testing location.

LTE-IMS Analyzers have unlimited ability to capture, decode, and measure KPIs. The analyzers support almost all of LTE-Diameter-IMS  protocol stack for decoding, which are -  S1, S3, S4, S5 (or S8), S10, S11, and X2 interfaces and Diameter sessions over S6a, S6d, S13, Cx, Dx, Sh, Gx, Rx and Gy/Ro interfaces.

GL's LTE-IMS protocol analysis probes feed data to centralized database (Oracle) in real-time for further analysis. The probes provide instant visibility into the performance with extensive KPIs, and also the operation of nodes in LTE networks.

NetSurveyorWeb™ Lite (PKV169) is an integrated and a cost-effective monitoring system that works with Protocol Analyzers as an addon tool to view call flow, call summary, call data records for all the captured calls. It is a web-based client that enhances the capabilities of protocol analyzer capability to process large volumes of real-time and historical data via browser-based clients, filter for specific calls, build custom statistics and KPIs, automation and graphical features to analyze the call detail records (CDRs).


LTE/5G QoS Test Suite Voice, Video,
& Data Quality Testing
VQuad™ Probe HD is a self-contained unit used to objectively evaluate Signal Strength, Voice, Video, & Data Quality on Cellular networks (5G, 4G VoLTE, 3G, 2G), Land Mobile Radios, and Wired networks.

It includes VQuad™ software, Dual Universal Telephone Adapter (Dual UTA HD), and PC in a portable platform. VQuad™ Probe HD can connect to practically any end-point, wired or wireless devices, independent of underlying network type. VoLTE testing supported using either Bluetooth® or wired headset connection methods.

Various associated analytical applications (Voice QualityVideo Quality, Data testsEcho and Delay testsFax testsVoice Band Analysis) work with the base VQuad™ software to provide "end-to-end assessment" of the network performance.

GL’s Voice Quality Testing (VQT) supports automated voice quality between using - POLQA (ITU-P.863) and PESQ (ITU-P.862). The POLQA algorithm is specifically used for testing Wideband VoLTE networks.

GL’s VQuad™ NetTest solution supports egress/ingress Data analysis along with Voice/Video Quality Testing and GPS.
Massive LTE UE and Traffic Simulation

GL’s MAPS™ Server with PacketLoad appliance supports massive simulation of UEs (up to 500000) with mobile data traffic at high line rates (up to 4 Gbps or 40 Gbps) for both UMTS, and LTE networks.

It offers all features to perform functional unit tests at every integration point within the wireless infrastructure. The MAPS™ Server with PacketLoad can be used to test all network elements in access & packet core to ensure negotiated QoS is met.

The solution allows to encapsulate the generated packet data within GTP headers and transmit 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.
Simulation of SMS and CS Fallback

With CSFB (Circuit-switched Fall Back) feature, an LTE device "falls back" to the 3G or 2G network to complete the call or to deliver Voice and SMS.

GL’s MAPS™ SGs is designed to simulate the CS fallback function for Voice and SMS delivery via the Circuit Switched (CS) core network using SGs interface between the MME in the EPS and the VLR, as per 3GPP specifications. The SGs Application Part (SGsAP) protocol used on the SGs interface between the MME <-> MSC/VLR allows location management co-ordination and relay certain messages related to GSM circuit switched services over the EPS system.

In addition, MAPS™ IMS emulators can emulate functions of an IP-SM-GW network element in order to push or pull SMS from LTE-EPC to SMSC over IP/IMS network. In SMS over IMS communication, SMS is encapsulated in a SIP message and carried over IMS core network to SMSC.  The IP Short Messaging Gateway (IP-SM-GW) network element provides the interconnection between GSM-UMTS network and LTE-EPC network for sending and receiving SMSes.
Simulation of LTE S1 Interface

GL's MAPS™ designed for testing LTE - S1 interface can simulate Evolved Node B (eNodeB), and Mobility Management Entity (MME) network elements. The application gives the users the unlimited ability to edit S1-AP/NAS messages and call scenarios (message sequences).

The product supports real-time GTP traffic using Mobile traffic core - GTP (ETH101) between any two nodes in LTE and UMTS networks.It also supports Mobile Traffic Core - Gateway (ETH102) module to offload GTP traffic to media gateway over IP. These modules also support generation and verification of data traffic such as Web (HTTP).

Simulation of LTE eGTP Interfaces
(S3, S4, S5, S8, S10, S11 and S16)
GL's MAPS™ designed for testing LTE eGTP interfaces - S3, S4, S5/S8, S10, S11, & S16 can simulate Mobility Management Entity (MME), Serving Gateway (SGW), and Packet Data Network Gateway (PGW) network elements. The MAPS™ LTE eGTP supports simulation of Path Management procedures, Tunnel Management procedures, Control Plane, and User-plane GTP  traffic simulation over eGTP interfaces.

The product supports real-time GTP traffic using Mobile traffic core - GTP (ETH101) between any two nodes in LTE and UMTS networks. It also supports Mobile Traffic Core - Gateway (ETH102) module to offload GTP traffic to media gateway over IP. These modules also support generation and verification of data traffic such as Web (HTTP).
Simulation of LTE X2 AP Interface

The X2 Application Protocol (AP) is the interconnecting interface between two eNodeBs in LTE network and supports both Control Plane and User Plane. GL's MAPS™ LTE X2AP is used to co-ordinate handovers and perform load management between Evolved NodeBs (eNodeBs) - Source eNodeB and Target eNodeB. The MAPS™ X2-AP test tool is designed with specific test cases, as per LTE 3GPP TS 36423-900 standards.

LTE X2 AP simulates thousands of UEs and supports Mobility Management, Load Management, Error Situations, Re-setting X2, Setting up the X2, and eNodeB Configuration Update procedures.

If you have any inquiries or questions on test and measurement products for IP, TDM, or Wireless based telecommunication networks, please contact us using this Infomation Request form or subscribe to our social media sites:         
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