Challenges during LTE rollout and how to tackle them - Fhi · Challenges during LTE rollout – and...
Transcript of Challenges during LTE rollout and how to tackle them - Fhi · Challenges during LTE rollout – and...
Challenges during LTE rollout – and how to tackle them
Christian Fischer
Product Manager Drive Test Tools
Rohde & Schwarz, Munich, Germany
Oct 2013 | LTE challenges | 2
Rohde & Schwarz – The company group at a glance
l History Established 1933 in Munich, Germany
l Type of enterprise Independent family-owned company
l Global presence In over 70 countries, approx. 60 subsidiaries
Sales office in Nieuwegein, Service in Belgium
l Net revenue Approx. EUR 1.9 billion (FY 12/13, July through June)
l Export share Approx. 90 percent
l Employees 9300 worldwide, with approx. 5500 in Germany
l Success A leading international supplier in all of its fields of business
Oct 2013 | LTE challenges | 3
LTE roll out – Challenges over challenges
800MHz is not 900MHz –
and what about 2600MHz?
There are already plenty of
antennas and cabinets on
the rooftop….
Why do we do all of this?
Oct 2013 | LTE challenges | 4
LTE roll out – why do we do all of this?
l End user behavior is best represented when
measurements are performed with smartphone based
measurement systems
l Main reasons for LTE roll out
l Provide high throughput for data services – for customers
l Achieve more efficient use of spectrum – for operators
l Broadband coverage of rural areas – for regulators
l Availability and throughput of data services are the main customer
satisfaction parameters
Oct 2013 | LTE challenges | 5
QualiPoc LTE measurements
Serving
cell Neighbor
cells Data download
Also available for GSM, WCDMA, WiFi
Navigation
Oct 2013 | LTE challenges | 6
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 Streaming
Multi-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
Oct 2013 | LTE challenges | 7
Finding reasons for low data rates l 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
SINR RSRP
Oct 2013 | LTE challenges | 8
Good coverage, but low SINR: missing dominance
Pilot Pollution:
Best server SINR
RSRP
SINR RSRP
Oct 2013 | LTE challenges | 9
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 parallel
l High measurement
speed
l Easy one click
evaluation showing
coverage and pilot
pollution problem
spots
Oct 2013 | LTE challenges | 10
800MHz is not 900MHz l 800 MHz – missing experience in this frequency band
l For some operators 900MHz experience is available since years
l 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 to
learn about real coverage – and finally capacity
Oct 2013 | LTE challenges | 12
LTE800 frequency assignment plan
Frequency [MHz]
Channel 60
8
MHz
78
2,0
Potential interference danger in low cost DVB-T receivers -
having bad or no RF input filters
l Example from Germany
Oct 2013 | LTE challenges | 14
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 scanner – no
separate box needed
l Spectrum may be recorded in
the background
l Geographical location available
l No band limitations
(80MHz…6GHz)
Oct 2013 | LTE challenges | 15
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
Oct 2013 | LTE challenges | 16
… and what about 2600MHz?
l LTE 2600MHz – unknown frequency behavior
l Mainly used as capacity extension on hot spots and
indoors
– Trade fairs, airports, downtown, shopping malls
l Small cells, Het Net, micro cells, WiFi offloading
l In a nutshell: everything new…
l Testing of data rates and handovers with smartphone
based measurement systems
l Coverage and interference tests with scanner
l Tele2 live network
in Stockholm,
Sweden
l FDD2600MHz,
20MHz
l HTTP 140MB DL
transfer
Oct 2013 | LTE challenges | 17
LTE 1800MHz – the compromise?
l LTE 1800MHz has turned out to be more than a compromise
l 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
Oct 2013 | LTE challenges | 18
Single RAN integration and refarming
l Single RAN: Integration of several technologies
into one cabinet
l Refarming: Re-use of frequencies for new
technology
l Long term advantages
l reduction of space, equipment, site rental costs, power
l Spectrum used more efficiently
l Fewer suppliers
l Short term disadvantages
l Equipment swap - Service interruption
l Measurements for Quality assurance
l Installation and commissioning with potential errors
Oct 2013 | LTE challenges | 19
Handheld Cable & Antenna Analyzer R&S ZVH Handheld 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 matching
Antenna isolation
Cable faults
Cable loss
BTS output power
BTS output spectrum
Interference hunting
Oct 2013 | LTE challenges | 20
R&S ZVH and FSH Highlights Measurement Wizard & Report Generator l 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
Oct 2013 | LTE challenges | 21
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 using
Rohde&Schwarz measurement equipment
New interference scenarios come up
Oct 2013 | LTE challenges | 22
R&S LTE Portfolio for chipset, component, device and base station testing
Signaling Conformance
Radio Network
Analyzers incl. ROMES Drive
Test Tools RF Conformance
R&S®CMW500
including 3GPP
conformance tests
R&S®TS8980
RF Test
System
&
RRM Test
System
R&S®CMW500
Testing of - Protocol Layers
- Operator Scenarios
- E2E Application
- Max. Throughput
- IP4/6
- MIMO
- Handover
Signal Generator / Fading Simulator
Signal Analyzer /
Power Meter
R&S®FSW
R&S®FSV
R&S®SMW200A R&S®SMBV100
One box Mobile Radio Tester for
Calibration, Verification and Functional Test
R&S®CMW500 R&S®FSH/ZVH
TS8980FTA
+ out-of-band and
TV interferer tests
Installation
and
Maintenance
1st TD-LTE RF test
cases validated
by GCF
LTE functionality
since May 2008
TD-LTE,
LTE FDD, GSM,
WCDMA/HSPA(+)
and CDMA2k
in one box!
R&S®NRP
RF Development Protocol Stack Field Conformance
and Production and IOT Testing Testing
Oct 2013 | LTE challenges | 24
Marcel Tersteeg
Account Manager
Broadcast & Telecom operators
ROHDE & SCHWARZ Netherlands
Test 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 Netherlands Contact details