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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: marcel.tersteeg@rohde-schwarz.com
Internet: www.rohde-schwarz.com
Webshop: www.testenmeetwinkel.nl
Rohde & Schwarz NetherlandsContact details
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Thank you
for your attention!
Any questions?
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