VoLTE Service Monitoring - VoLTE Voice Call

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    15-Apr-2017
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Transcript of VoLTE Service Monitoring - VoLTE Voice Call

  • 1

    The challenges of VoLTE Service Monitoring

    LTE rollouts supported by TEMS around the world

    Ensure QoE

    UnderstandScenarios

    Join Webinar

    Currently no accepted standard for measurement, monitoring VoLTE Services

    Ascom has defined a formal definition, implementation strategy to help Operations Covers issues related to EPC, IMS, Application Service

    We will describe this solution in a number of short articles

    Join Webinar

    SubscribeMore Blog Articles

    UnderstandTest Scenarios

    VoLTE Service Monitoring Challenges

    TEMS VoLTE Service Monitoring: The VoLTE Voice Call

  • Contents

    1. Title

    2. Contents

    3. Introduction

    4. 24 x 7 monitoring

    5. SW and HW Layers

    6. Multi-Layer Active Monitoring

    7. TEMS Tracker: Adding Passive Monitoring

    8. TEMS Tracker: VoLTE to VoLTE Calls

    9. The Overview dashboard

    10. The Test Case dashboard

    11. The Test Run dashboard

    12. Service Steps

    13. Quality Metrics

    14. Signal Flow

    15. Diagnostics

    16. Related Posts

    17. Disclaimer

    Copyright 2016, Ascom Network Testing Ltd 2

  • Introduction

    #2 in a series of brief articles aboutthe challenges of VoLTE Service Monitoring.

    There is currently no accepted standard for the measurement or monitoring of VoLTE Services, even though we believe that this is vital to assure the quality and reliability of such services - and to establish a framework for reliable comparison across implementations.

    To this end Ascom has defined a formal definition and implementation strategy to help the Operations team solve a range of challenges, including issues related to EPC, IMS and the Application Server. We will describe this solution in a number of short articles.

    This article describes the architecture of our solution and the VoLTE Voice Calltest case.

    Copyright 2016, Ascom Network Testing Ltd 3

  • VoLTE Service Monitoring - 24 x 7

    IMS Solution 2.7 for VoLTE, VoWiFi, RCS and VoB

    Our VoLTE Service Monitoring Solution consists of a suite of test cases (described in a previous post), which is run to provide 24 x 7 monitoring of service availability and quality and additional diagnostics to investigate outages or other issues.

    Test cases are run on a high-availability, multiply-redundant Cloud-based system with a 99.95% uptime guarantee, to maintain 24 x 7 operation.

    Results are published in near-real-time to dashboards on a web portal with the same uptime guarantee and can be accessed from any compatible web browser.

    Confidentiality is protected by physical security for the servers and user authentication for remote access; encrypted protocols and client IP whitelisting are also available to further secure remote access.

    Test cases are run on TMM Agents using device simulation to emulate subscribers making and receiving VoLTE calls across the network, so testing is end-to-end.

    Copyright 2016, Ascom Network Testing Ltd 4

  • The Agent: Software and Hardware layersTMM SW

    agent

    TMM HWagent

    Test Suites

    IMDN

    CPIM

    SMSoIP

    L3 Radio

    USSDoIP

    L3 Radio

    FEMTOCELL

    L3 Radio

    SIP Procedures

    SIP

    OMA DM

    provisionXCAP

    HTTP

    TLS

    IMS Procedures

    RTP

    AMR H.264MSRP

    MEDIA Procedures

    GSMA IR.92

    (VoLTE)

    GSMA IR.94

    (Video over LTE)OMA SIMPLE OMA CPM

    VoWiFiGSMA RCS

    FEMTOCELL

    Procedures

    COM SERVER

    (TMM) TEMS Monitor Master LTE ProceduresSRVCC

    LAN adapter 2G/3G Modem 4G Modem

    Test Cases

    API Layer

    Service Layer

    Network Layer

    Protocol Layer

    Access Layer

    PCC

    Procs.

    Gx App

    Diameter

    Base

    Device/Client

    Simulation

    IPSec

    Our Agents implement all these SW layers on top of a HW interface layer. By using an LTE modem to simulate a Smartphone we get optimum control, flexibility & low level access and a proven architecture refined by thousands of hours of testing.

  • Multi-Layer Active Monitoring

    RTP

    MRF

    Mr

    MME

    S6a

    Gm

    S5/S8Uu S1-U

    EnodeB

    Rx ISC

    EPC IMS

    HSS

    SGW PGW

    PCRF P-CSCF S-CSCFTAS

    TOOL SUT (System Under Test)

    Rx

    Gx

    LTE

    Emulated Interface

    Internal Interface

    Media Path

    TMM

    SW

    1. UE simulationor real device

    TMM

    SW

    Gx

    Gm

    TMM

    SW

    ISC

    TEMS Monitor Master with IMS Agent runs on different Layers so it can test and monitor them all - to measure the reliability and performance of the many different Network Domains and Elements within the Network and help you identify any components that are failing in real time!

    2. PGW simulation

    3. IMS simulation

    Copyright 2016, Ascom Network Testing Ltd 6

  • Emulated InterfaceInternal InterfaceMedia Path

  • TEMS Tracker: VoLTE to VoLTE calls

    Element Service Metrics for MO and MT

    Ascom TEMS Monitor MasterActive Agent

    Call setup preconditions Call setup resources confirmation Call setup alerting Call setup answer Audio exchange Call release

    Call setup time Audio POLQA score Audio average jitter Audio maximum jitter Audio minimum bit rate Audio average bit rate Audio maximum bit rate Audio packet loss rate

    3rd PartyPassive Probe

    Collect signalling related S11, Gm, Gx and Rx network interfaces Call trace

    TEMS TrackerAnalysis of signalling collected by Passive Probing system

    Call Routing (User1, PCSCF1, PCRF1, PGW1, MME1) MO and MT S11 LTE Tunnel Info S11 GTP Failure Cause Code S11 GTPv2 Qos info Gx Auth Info Gx Diameter Failure Cause Code L1 and L2 audio SDP Info L1 and L2 SIP Failure Cause Code L1 and L2 SIP Reason Header src audio RTP Info dst audio RTP Info

    S11 GTPv2 Procedures Create Bearer Update Bearer Delete Bearer

    Gx Diameter Procedures Auth Re-Auth Credit Control

    L1 and L2 Call Start Time L1 and L2 Call Ringing/Progress Tim L1 and L2 Call Answer Time L1 and L2 Call Answer Confirm Time L1 and L2 Call End Tim

    Ascom TEMS Monitor Master

    IT Agent Subscriber profile within HSS database Subscriber profile within PCRF database

    Analysis of Active Agent + Passive Signalling + Subscriber profile information

    Automated Root Cause of Failure Analysis

    Automated Service and Quality Degradation Analysis

    Copyright 2016, Ascom Network Testing Ltd 8

  • The VoLTE to VoLTE Call test caseThe Overview Dashboard

    Provides an availability summary and lists any issues for each service: IR.92, IR.94, IMS, & Supplementary Services

    Displays service status by regionCopyright 2016, Ascom Network Testing Ltd

    This summarises the status of the VoLTE Service, using results from all the VoLTE test cases:

    Categorizes and lists all issues in the Failure Distribution table

    Drill down to details of any service, period, test case, test run, or issue

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  • The VoLTE Voice Call test caseThe Test Case Dashboard

    Service availability over time when did the problem start?

    Service availability per step where did the problem start?

    Copyright 2016, Ascom Network Testing Ltd

    Displays recent results for the selected (VoLTE Voice Call) test case:

    Quality Metrics over time how well is the service operating?

    VoLTE to VoLTE service status by region on a world map

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  • The VoLTE Voice Call test caseThe Test Run Details dashboard

    The Test Run Details dashboard displays details of a single test, including:

    Copyright 2016, Ascom Network Testing Ltd

    Subscriber details: network operator, MSISDN, IMS and bearer

    Dependencies: the test cases run to support this test run: - LTE Attach, - IMS Entry Point Discovery, - IMS Registration and - IMS Subscription to Events

    Links: to Radio Trace, IP Trace, and Audio files to download

    Messages: information collected during this test run from a Passive Probe or CDR related to this scenario.

    Root cause of failure: if there was an issue, an analysis of all the collected information designed to help identify what caused it.

    Test Case Flow: a diagram of the test case steps, showing the message flow and status of each step. See Signal Flow

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  • The VoLTE Voice Call test caseService Steps

    The Agent monitors the most relevant Service Steps within each Test Case to help identify what is failing and affecting the customers Quality of Service:

    Copyright 2016, Ascom Network Testing Ltd

    Step 1: Call setup preconditions

    Step 2: Call setup resources confirmation

    Step 3: Call setup alerting

    Step 4: Call setup answer

    Step 5: Audio exchange

    Step 6: Call release

    Service Steps can be monitored from end to end or from the Network Interface layer - by using the new TEMS Tracker option

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  • The VoLTE Voice Call test caseQuality Metrics

    The Agent manages and measures independently 2 audio channels (in and out) for each Subscriber a total of 4 channels for each call and reports a range of Quality Metrics to measure the Quality of Service perceived by the customer:

    Copyright 2016, Ascom Network Testing Ltd

    Call setup time (ms)

    Audio POLQA score

    Audio average jitter (ms)

    Audio maximum jitter (ms)

    Audio minimum bit rate (kbps)

    Audio average bit rate (kbps)

    Audio maximum bit rate (kbps)

    Audio packet loss rate (%)

    Metrics can be combined or reported separately for each party in the VoLTE Call.

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  • The VoLTE Voice Call test caseSignal