Rohde Schwarz 2

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    Challenges during LTE rolloutand how to tackle them

    Christian Fischer

    Product Manager Drive Test Tools

    Rohde & Schwarz, Munich, Germany

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    Rohde & SchwarzThe company group at a glance

    l HistoryEstablished 1933 in Munich, Germany

    l Type of enterpriseIndependent family-owned company

    l Global presence

    In over 70 countries, approx. 60 subsidiariesSales office in Nieuwegein, Service in Belgium

    l Net revenueApprox. EUR 1.9 billion (FY 12/13, July through June)

    l Export shareApprox. 90 percent

    l Employees9300 worldwide, with approx. 5500 in Germany

    l SuccessA leading international supplier in all of its fields of business

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    LTE roll outChallenges over challenges

    800MHz is not 900MHzand what about 2600MHz?

    There are already plenty ofantennas and cabinets on

    the rooftop.

    Why do we do all of this?

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    LTE roll outwhy do we do all of this?

    l End user behavior is best represented whenmeasurements are performed with smartphone based

    measurement systems

    l Main reasons for LTE roll out

    l

    Provide high throughput for data servicesfor customersl Achieve more efficient use of spectrumfor operators

    l Broadband coverage of rural areasfor regulators

    l Availability andthroughput of data services are the main customer

    satisfaction parameters

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    QualiPoc LTE measurements

    Serving

    cell Neighbor

    cellsData download

    Also available for GSM, WCDMA, WiFi

    Navigation

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    Air Interface logging

    Forcing Functions (Technology/Band, preferred UARFCN)

    Voice Call testing (Call To Any)

    Speech Testing (P.862, SQUAD or P.863 NB and WB)

    M->L and M->M, MOC and MTC, DL and UL

    Data

    Ping, FTP DL/UL, HTTP DL/UL,Capacity DL (multi thread HTTP), Iperf UDP/TCP

    HTTP Browsing

    Messaging (SMS, MMS, Email)

    YouTube Video StreamingMulti-Mix job (Sequence of Voice and Data)

    Multi-RAB job (Simultaneous Voice and Data)

    Parallel jobs (Up to 3 jobs independently)

    2-2.5G 3G 4G

    **

    **

    ****

    **CSFB or

    SVLTE

    QualiPoc Test Cases

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    Finding reasons for low data ratesl To find the reasons for low data rates, a radio network

    scanner is used

    Good coverage, low SINR why?

    Areas of low data rates

    Low coverage, low SINR

    SINRRSRP

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    Good coverage, but low SINR: missingdominance

    Pilot Pollution:

    Best server SINR

    RSRP

    SINRRSRP

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    Coverage measurements

    l Using a mobile radio network scanner provides easy

    and fast information about coverage and interference

    l No band limitations

    l Several technologies

    in parallell High measurement

    speed

    l Easy one click

    evaluation showing

    coverage and pilotpollution problem

    spots

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    800MHz is not 900MHz

    l 800 MHzmissing experience in this frequency band

    l For some operators 900MHz experience is available since yearsl Operators are potentially re-using their existing propagation models

    l Expectation that 800 MHz is quite similar to 900 MHz

    l BUT - reality is different:

    l High danger of interference due to long ranging signals

    l Coverage measurements required to calibrate propagation models and tolearn about real coverageand finally capacity

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    The larger picture

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    LTE800 frequency assignment plan

    Frequency [MHz]

    Channel 60

    8

    MHz

    782,0

    Potential interference danger in low cost DVB-T receivers -

    having bad or no RF input filters

    l Example from Germany

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    The real world

    TV Transmitter

    sideband emissions

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    RF Power Scan

    l RF Power Scan is a Spectrum Analyzer light

    functionality inside the mobile radio network scanner

    Applications:

    l Finding mobile radio networks

    l Finding external interferers

    l Measuring uplink frequencies

    l Spectrum clearance

    measurements

    Advantages:

    l Included in scannernoseparate box needed

    l Spectrum may be recorded in

    the background

    l Geographical location available

    l No band limitations

    (80MHz6GHz)

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    RF Power Scan

    RF Power Scan Spectrum view shows

    l All defined sweeps

    (all bands, downlink, uplink)

    l Selected sweep

    (incl. Markers)

    l Waterfall diagram Complete Spectrum

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    and what about 2600MHz?

    l LTE 2600MHzunknown frequency behavior

    l Mainly used as capacity extension on hot spots and

    indoors

    Trade fairs, airports, downtown, shopping malls

    lSmall cells, Het Net, micro cells, WiFi offloading

    l In a nutshell: everything new

    l Testing of data rates and handovers with smartphone

    based measurement systemsl Coverage and interference tests with scanner

    l Tele2 live network

    in Stockholm,

    Sweden

    l FDD2600MHz,

    20MHz

    l HTTP 140MB DL

    transfer

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    LTE 1800MHzthe compromise?

    l LTE 1800MHz has turned out to be more than a compromisel Frequencies are well known for many operators

    l 1800MHz Propagation is beneficial

    however, in many cases refarming is necessary

    Source: gsacom.com

    Number of commercially launched LTE FDD

    networks in Sept 2013

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    Single RAN integration and refarming

    l Single RAN: Integration of several technologiesinto one cabinet

    l Refarming: Re-use of frequencies for new

    technology

    l Long term advantagesl reduction of space, equipment, site rental costs, power

    l Spectrum used more efficiently

    l Fewer suppliers

    l Short term disadvantagesl Equipment swap - Service interruption

    l Measurements for Quality assurance

    l Installation and commissioning with potential errors

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    Handheld Cable & Antenna Analyzer R&S ZVHHandheld Spectrum Analyzer R&S FSH

    Basic: BTS maintenance and trouble shooting

    BTS output spectrum

    Cable loss, Cable faults,

    BTS Output power

    Geotagging

    BTS Parameter

    measurements

    Connected to BTS Over-The-Air (OTA)

    DL Signal quality

    measurements

    Interference analysis

    Extended: interference hunting and cable and

    antenna test

    Antenna matchingAntenna isolation

    Cable faults

    Cable loss

    BTS output power

    BTS output spectrum

    Interference hunting

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    R&S ZVH and FSH HighlightsMeasurement Wizard & Report Generatorl The wizard guides the user through the measurement sequence.

    Written instructions and pictures can be added to each

    measurement step

    l Back in the office report is ready after a couple of mouse clicks

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    Conclusion

    Still classical installation problems remain

    New frequencies need to be managed

    High data rates should be achieved

    These challenges can be overcome and solved by usingRohde&Schwarz measurement equipment

    New interference scenarios come up

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    R&S LTE Portfoliofor chipset, component, device and base station testing

    Signaling Conformance

    Radio Network

    Analyzersincl. ROMES Drive

    Test ToolsRF Conformance

    R&SCMW500

    including 3GPP

    conformance tests

    R&STS8980

    RF Test

    System

    &

    RRM TestSystem

    R&SCMW500

    Testing of- Protocol Layers

    - Operator Scenarios- E2E Application

    - Max. Throughput

    - IP4/6

    - MIMO

    - Handover

    Signal Generator / Fading Simulator

    Signal Analyzer /

    Power Meter

    R&SFSW

    R&SFSV

    R&SSMW200A R&SSMBV100

    One box Mobile Radio TesterforCalibration, Verification and Functional Test

    R&SCMW500 R&SFSH/ZVH

    TS8980FTA

    + out-of-band and

    TV interferer tests

    Installation

    andMaintenance

    1stTD-LTE RF test

    cases validatedby GCF

    LTE functionality

    since May 2008

    TD-LTE,

    LTE FDD, GSM,

    WCDMA/HSPA(+)

    and CDMA2k

    in one box!

    R&SNRP

    RF Development Protocol Stack Field Conformance

    and Production and IOT Testing Testing

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    R&S LTE information, App. Notes, Videos, etc.

    www.rohde-schwarz.com/

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    Marcel Tersteeg

    Account Manager

    Broadcast & Telecom operators

    ROHDE & SCHWARZ NetherlandsTest and Measurement

    Perkinsbaan 1 3439 ND Nieuwegein

    P.O. Box 1315 3430 BH Nieuwegein

    Tel +31 (0)30 6001722 Mob +31 (0) 6 46324415

    email: [email protected]

    Internet: www.rohde-schwarz.com

    Webshop: www.testenmeetwinkel.nl

    Rohde & Schwarz NetherlandsContact details

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    Thank you

    for your attention!

    Any questions?