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Testing LTE, and VoLTE

Typical VoLTE Call over LTE-IMS Network

LTE (Long Term Evolution) is the so called 4G (4th Generation) 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 support for testing LTE, VoLTE, and other components of IMS network are 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,

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  • GL’s PacketScan™ - an All-IP monitoring and analysis probe, along with NetSurveyorWeb™ allow centralized monitoring of entire LTE-IMS network
  • GL’s VQuad is used for end-to-end voice, video, and data quality testing with speech metrics such as PESQ, and POLQA, combined with other metrics such as delay, packet loss, drops, and more, the true effect of VoLTE can be realized.
  • GL’s general-purpose protocol simulation tool - MAPS™ - supports simulation of various interfaces of LTE and IMS (S1, eGTP, Diameter interfaces) – this includes simulation of signalling and traffic such as Voice over LTE (VoLTE)
  • Wide range of codec support, including AMR WB, and extensive per-call reports

LTE Network Test Solutions

  • Connect to Mobile Phones, Smart Phones, and Broadband Devices using GL’s portable VQuad™ - Dual UTA system.
  • Test LTE devices for Voice, Data, Video quality metrics with complete automation and centrally controlled system
  • Use GL’s VQuad™ - Dual UTA 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.

Monitoring LTE Network

  • GL's PacketScan™ - an All-IP Network Monitoring softwareoffers powerful features to capture and monitor live signaling and traffic over IP. PacketScan™ with Video QoS capability addresses customers long felt need of Video Call Quality Analysis in IP networks.

    • Supports decoding and analysis of new IMS-based Voice over LTE
    • 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
    • Traffic statistics includes Digits, Tones, Voice, Video, Fax Live monitoring Ipv4 and IPv6 (version 4 and version 6) networks
    • Monitors QoS (quality of service) on voice and video calls
    • Capable of capturing, decoding and performing various test measurements between any two nodes across various interfaces of the LTE network
    • 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 is easily decoded in GL’s Packetscan™ All-IP analyser –

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.

Testing Voice and Data Quality on LTE Network

  • 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 system
  • Test LTE devices for Voice, Data, Video quality metrics with complete automation and centrally controlled system
  • Use GL’s VQuad™ - Dual UTA to confirm quality of service during the network upgrade process
  • VQuad™ can send commands to the Mobile Device Controller application residing on the smart phones to remotely perform Automated Data Testing irrespective of 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
  • Support for WiFi, Broadband Card (3G/4G/LTE), and wired Ethernet

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

Signalling and Traffic Simulation over LTE

  • Supports emulation of several interfaces – currently S1 – MME, eGTP-c ( S3, S4, S5, S8, S10, S11 and S16), and Diameter (S6a, S6d, S13, Cx, Dx, Gx, and Rx), X2-AP interfaces.
  • 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
  • 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

Buyer's Guide:

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), UTA or UEA (USB Units), HUT or HUE (Universal Cards), and HDT or HDE (HD cards) depending upon the hardware.

Item No. Item Description
PKV107 Real-time LTE Protocol Analyzer (Requires PKV100)
PKV108 Offline LTE Analyzer (Decode / Analyse pre-captured LTE files Requires PKV101)
PKV100 PacketScan™ (Online and Offline)
PKV101 PacketScan™ (Offline)
PKS139 MAPS™ Diameter Emulator
PKS140 MAPS™ LTE S1 Emulator
PKS141 MAPS™ LTE X2-AP Emulator
PKS142 MAPS™ LTE - eGTP-c Emulator
VQT270 VQuad™ Probe with Dual UTA
VQT601 Mobile Device Controller (MDC) Software
VQT006 VQT w/ POLQA Server License
VQT600 VQuad™ NetTest Data Server Solution
  Related Software
PKS170 NetSurveyorWeb™
PKS171 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™
VQT610 Target Data Server
  Related Hardware
PacketExpert™ 12 Port
PacketExpert™ 24 Port

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