Network Simulation

Telecom Test Solutions

Testing LTE, and VoLTE

LTE-IMS Network (VoLTE) Test Solution
LTE-IMS Network (VoLTE) Test Solution 


Long Term Evolution (LTE) is the so called 4th Generation (4G) mobile standard in the rapidly evolving mobile technologies. Its distinguishing feature is an all IP infrastructure and significantly greater air interface bandwidth to the mobile handset. It was developed as an enhancement to the existing 3G UMTS System (Universal Mobile Telecommunications System) to provide users enhanced mobile radio and internet access.

The LTE air interface is a completely new system based on orthogonal frequency-division multiple access (OFDMA) in the downlink and single-carrier frequency-division multiple access (SC-FDMA) in the uplink. The system efficiently supports multi-antenna technologies (MIMO).

Another significant feature of LTE is its high bandwidth—up to 20 MHz. The LTE can also operate in the existing 5-MHz UMTS frequency bands, or in even smaller bands, as the usable bandwidth is scalable.

However, deploying high-quality voice, video, and data services over LTE has posed significant challenges for service providers, due to backward-compatibility, inter-operability, and high quality requirements – all of which requires rigorous testing.

GL's LTE Test Solutions

GL’s provides fully automated testing solutions for LTE, VoLTE, and IMS network as discussed in greater detail below.

The representation of LTE–IMS network above indicates the support of most of the interfaces by GL’s test tools. In summary,

  • All elements within LTE-IMS wireless infrastructure can be tested with GL’s general-purpose protocol simulation tool - MAPS™, which supports simulation of various interfaces of LTE (S1-u, S1-MME, X2, S3, S4, S5/S8, S6a, S10, S11, S13, S16) and IMS (Cx/Dx, Rx, Gx, Gm, SGi, Mw, Mi, Mj) interfaces using MAPS™ LTE, Diameter, and  IMS simulators. With these, one can simulate VoLTE calls in lab, and study the network behaviour.
  • GL’s PacketScan™ - an All-IP monitoring and analysis probe, along with NetSurveyorWeb™ allow centralized monitoring of entire LTE-IMS network. Wide range of codec support, including AMR WB, and extensive per-call reports

Monitoring LTE,VoLTE, IMS Networks

  • Capable of capture, decode and perform various test measurements between any two nodes across various interfaces of the LTE-IMS network
  • Support for wide-range of codec, including AMR and AMR WB – visit Voice Codec webpage for more details.
  • Supports QoS parameters such as E-model (G.107) based MOS/R-Factor scores, Media Delivery Index (Delay Factor: Media Loss Rate) for video calls, Jitter, Delay, and Gap for Audio and Video traffic
  • Segregates, captures, and collects statistics on VoIP and Wireless calls
  • Live monitoring of traffic statistics - digits, tones, voice, video, and T.38 fax over IPv4 and IPv6 (version 4 and version 6) networks
  • Monitors QoS (quality of service) on voice and video calls
  • Supports both real-time and offline analysis
  • Trace files for analysis can be loaded through simple command-line arguments.

As an example, the screenshot below illustrates how VoLTE call is easily decoded in GL’s Packetscan™ All-IP analyzer

Typical VoLTE Call Captured LTE-IMS Network
Typical VoLTE Call Captured LTE-IMS Network

Visit PacketScan™ for Wireless Networks or LTE Analyzer webpage for more details. For centralized web-based monitoring LTE Network, visit NetSurveyorWeb™ page.

Measure Voice, Video and Data Quality on LTE, VoLTE Networks

Automated wireless testing

Using GL’s VQuad™ with the Dual UTA HD, or all-in-one VQuad™ Probe, along with centralized analytical tools, voice, data, as well as video quality can be tested simultaneously on a wireless or wired network.

Since the GL’s VQuad™ solution is network independent, all Voice and Data networks are supported including 3G, WiMax, 4G LTE, Advanced LTE and the upcoming 5G.  And since the GL VQuad™ solution supports both Narrowband and Wideband traffic, VoLTE testing is fully supported. 

GL’s VQuad™ NetTestsolution provides automated data testing on Mobile Devices (Android and Apple) as well as PC based internet connections. The Data Testing includes TCP, UDP, HTTP, FTP, DNS, VoIP, SMS, and Email tests. GL’s Video Application Part (VAC) supports Video Conference testing between any two VAC Agents. GL’s VAC Agents can be installed on any Android device, WinPCs or Linux box.  GL’s Voice Quality Testing (VQT) supports automated voice quality between any two nodes within the network using latest ITU based algorithms including Perceptual Objective Listening Quality - POLQA (ITU-P.863) and PESQ (ITU-P.862). The POLQA algorithm is specifically used for testing Wideband voice over VoLTE networks.

  • Complete end to end voice, data, video quality testing of LTE network-visit Automated Network Wide Testing
  • Automated test statistics and results across next generation LTE network can be accessed via web interface
  • Connect to Mobile Phones, Smart Phones, and Broadband Devices using GL’s portable VQuad™ - Dual UTA HD system
  • Test LTE devices for Voice, Data, Video quality metrics with complete automation and centrally controlled system
  • Use GL’s VQuad™ - Dual UTA HD to confirm quality of service during the network upgrade process
  • VQuad™ can remotely perform Automated Data Testing on any Android or IOS mobile devices (running the GL NetTest app), irrespective of where the phone is located, and whether the phone is on a voice call or not.
  • Perform automated data testing on PC-based Broadband Internet (Broadband 3G/4G/LTE, WiFi, Wired) and on Apple/Android Mobile Devices – tests includes TCP, UDP, HTTP, VoIP, FTP, DNS, SMS, UEInfo, SimInfo, and PhoneInfo
  • Supported devices - Mobile Radio (PTT) & Mobile Phones (VoLTE, 4G, 3G, Wi-Fi, WiMax)
  • Supports both Narrowband (8k sampling rate) as well as Wideband (16k sampling rate) connections for use in VoLTE networks utilizing the AMR-WB codec

Visit Complete Voice and Data Quality webpage for more details.

As an example, the screenshot below illustrates the HD voice quality measurement of VoLTE call using POLQA–

HD Voice Quality Testing for VoLTE Networks
HD Voice Quality Testing for VoLTE Networks

  • VQT software includes industry standard voice quality analysis algorithms – POLQA and PESQ
  • POLQA testing is available for VQuad™ interfaces
  • VQT can be configured for fully Automated analysis of recorded voice files
  • Full Reference algorithm (FR) measurements with high accuracy for dedicated tests in live networks
  • POLQA analysis results include POLQA MOS, E-Model, Signal Level, Noise Level, and Jitter
  • Real-time mapping of results with GPS option used in conjunction with VQuad™.  Results mapped in WebViewer™ using Google Maps
  • The results can be accessed remotely from a database using the WebViewer™, displayed in both tabular and graphic formats

Visit voice quality testing webpage for more details.

Signaling and Traffic Simulation over LTE - IMS

Typical voice over LTE IMS network

MAPS™ SIP IMS test suite is capable of simulating multiple UEs and IMS core elements such as P-CSCF, I-CSCF, S-CSCF, PCRF, MGCF which provides the IMS core network. With the help of mobile phones, and other simulated wireless networks, the VoLTE Lab setup can be operated in real-time for making VoLTE calls and also for interworking with PSTN and VoIP networks. It includes ready-to-use scripts, as per IETF specification. Test scripts include general messaging and call flow scenarios for multimedia call session setup and control over IP networks.

GL’s “MAPS™ 4G Wireless Lab Suite” supports simulation of S1-MME, S11, S5/S8, and other eGTP interfaces along with Diameter interfaces.

  • Supports emulation of several LTE interfaces. (S1, X2-AP, S3, S4, S5, S8, S10, S11 and S16), and IMS interfaces (Cx/Dx, Rx, Gx, Gm, SGi, Mw, Mi, Mj)Supports generation and verification of traffic over LTE, including VoLTE (Voice), Email, FTP, Web (HTTP), Video, and more with additional licenses - Mobile traffic core – GTP (ETH101) and Mobile Traffic Core – Gateway (ETH102)
  • Supports IMS-based technologies such as VoLTE
  • Simulate up to 500 Smartphones (UEs) powering up and down
  • Integrate IMS core network easily with any other networks (wired or wireless) to test any call scenario It can simulate various nodes across LTE network –
    • S1-MME interface - eNodeB (also called Evolved NodeB), and MME (Mobility Management Entity) nodes in
    • eGTP-c interfaces - MME (Mobility Management Entity), SGSN (Serving GPRS Support Node), SGW (Serving Gateway), and PGW (Packet Data Network Gateway)
    • X2-AP interface – two eNodeB (also called Evolved NodeB) end-points
    • Diameter interfaces - MME (Mobility Management Entity), HSS (Home Subscriber Server), AF (Application Function), PCRF (Policy and Charging Rules Function), CSCF (Call Session Control Function), SGSN (Serving GPRS Support Node), PCEF (Policy and Charging Enforcement Function), EIR (Equipment Identity Register) and PDN GW (Packet Data Network Gateway)
  • Authenticate and confirm security procedures
  • QoS requests for greater or lesser bandwidth
  • Temporary addressing management for mobility and security


Please Note: The XX in the Item No. refers to the hardware platform, listed at the bottom of the Buyer's Guide, which the software will be running on. Therefore, XX can either be ETA or EEA (Octal/Quad Boards), PTA or PEA (tProbe Units), XUT or XUE (Dual PCIe Express) depending upon the hardware.

Item No. Item Description
PKV107 LTE (Long Term Evolution) Analyzer (Optional with PacketScan™)
PKV108 Offline LTE Analyzer (Decode / Analyze pre-captured LTE files Requires PKV101)
PKV112 5G Analyzer (Optional with PacketScan™)
PKV113 Offline 5G Analyzer - Optional with PKV101 (offline PacketScan™) and PKV170 (NetsurveyorWeb™)
PKS127 MAPS™ IMS Emulator
PKV100 PacketScan™ (Online and Offline)
PKV101 PacketScan™ (Offline)
PKV120 PacketScan™ HD w/4 x 1GigE
PKV120p PacketScan HD™ w/4 x 1GigE - Portable
PKV122 PacketScan™ HD w/2 x 10GigE
PKV122p PacketScan HD™ w/2 x 10 GigE - Portable


PacketScan HD™ w/40/100 GigE


PacketScan HD™ w/40/100 GigE - Portable

PKV123 PacketRecorder HD™ & PacketRePlay HD™
PKV121 PacketScan™ FB
PKS139 MAPS™ Diameter Emulator
PKS140 MAPS™ LTE S1 Emulator
PKS141 MAPS™ LTE X2-AP Emulator
PKS142 MAPS™ LTE - eGTP-c Emulator
PKS146 MAPS™ SGs Interface Emulation
VQT280 VQuad™ Probe HD (with Dual UTA HD)
VQT281 VQuad™ Probe HD w/o Dual UTA HD
VQT285 VQuad™ Probe HD Upgrade
VQT601 Mobile Device Controller (MDC) Software
VQT006 VQT w/ POLQA Server license (no limitations)
VQT600 VQuad™ NetTest Data Server Solution
  Related Software
PKV170 NetsurveyorWeb™(Perpetual License, Unlimited Users/Nodes)
– Includes Oracle 11g Standard Edition One and Standard Server-Grade Computing Platform
PKV169 NetsurveyorWeb™ Lite
- Probe Level WebServer, PacketScan™, and Oracle 11g Express Edition;
PKV171 Network Surveillance Agent Toolkit
PKV105 SIGTRAN Protocol Analyzer (Requires PKV100)
XX090 HDLC Capture and Playback Software (T1 or E1)
XX120 Real-time SS7 Analyzer (T1 or E1)
XX153 TRAU Analyzer
XX155 GPRS Protocol Analyzer
VQT040 WebViewer™