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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Oct 2013 | LTE challenges | 2

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?

Documents

Rohde Schwarz 2