lte july 2008 tm neu1
TRANSCRIPT
UMTS Long Term Evolution (LTE)R&S Portfolio
Christina GessnerTechnology Manager, Rohde & [email protected]
July 2008 | LTE T&M | 2
LTE Test requirements and solutions
July 2008 | LTE T&M | 3
LTE test requirementsLSTI and NGMN foral NGMN (R&S is partner since November 2007):
l R&S will reflect NGMN requirements in test solutions for nextgeneration technologies.
l R&S has participated in various taskforces within NGMN P18group for terminal certification (gap analysis).
l R&S has demonstrated LTE test solutions at the recent NGMNindustry conference (26-27 June 2008, Frankfurt)
l LSTI (R&S is member since February 2008):l R&S is contributing to the review of LSTI minimum feature set vs.
RAN5 test case coverage.l R&S has initiated a joint contribution of the T&M suppliers within
LSTI regarding an optional T&M workstream in IOT group.l R&S will draft and support LSTI IO(D)T specific test cases.l R&S will support LTE FDD and TDD field trial activities with test
solutions.
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R&S LTE test solutions
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RF testing for LTE / EUTRA
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LTE RF Testing on industry-proven platformsSignal Generation
SMU200A SMJ100A
SMATE200A
Signal Analysis
SMx Instrument Family
FSQ
+ AFQ/WinIQSIM2
+ AMU200AFSG
FSV
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Features supported for LTE FDD and TDDSignal generation and analysisl Full 3GPP compliancel Generation and analysis of LTE downlink/uplink physical channels and signals:
l Generation of PDSCH, PDCCH, PCFICH, PHICH, PBCH, PUCCH, PUSCHl Analysis of PDSCH, PDCCH, PCFICH, PHICH, PBCH, PUSCHl Uplink and downlink reference and synchronization signals
l All bandwidths up to 20 MHz and all UMTS bands supportedl QPSK, 16QAM, and 64QAM downlink/uplink modulation schemes supportedl Integrated 3GPP compliant downlink and uplink coding chain in signal generatorl All downlink MIMO modes supported: precoding, transmit diversity, spatial MUXl MIMO configurations with 2 and 4 antennas supportedl 2x2 MIMO signal generation in a one-box setup including fading simulationl Measurement of power, spectrum, modulation quality, constellation, EVM,
frequency error, CCDF, crest factor, relative inband emission, bitstream,…
Note: Some of the features are not yet available for LTE TDD mode.
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First challenge in terminal receiver verificationSynchronizing to an „LTE cell“ (SISO case)
Vector signal generator R&S SMU200Aprovides LTE downlink signal
Device under test
Configurable in:•Frequency•Bandwidth•Power•Modulation schemes
•Resource allocation•Data sources•Channel coding•Sync and pilot channels•…
July 2008 | LTE T&M | 9
LTE terminal receiver verificationCustomized downlink test signals as stimuli
l Reference Signalsl Synchronization Signalsl Downlink control channels
(PDCCH, PCFICH, PHICH, PBCH)l Downlink datal Fully 3GPP compliant channel
coding for uplink and downlinkl All MIMO modesl DTX / Dummy data in unscheduled
resource blocksl User defined data
Screenshot of R&S SMU200AScreenshot of R&S SMU200A
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LTE terminal receiver verificationFully 3GPP compliant channel coding chain
Screenshot of R&S SMU200AScreenshot of R&S SMU200A
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LTE terminal receiver verificationConfiguration of PDCCH, PHICH, PCFICH
Screenshot of R&S SMU200AScreenshot of R&S SMU200A
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Vector signal generator R&S SMU200Aprovides LTE uplink signal
Device under test
Configurable in:•Frequency•Bandwidth•Power•Modulation schemes
•Resource allocation•Data sources•Uplink pilot channels•…
First challenge in base station receiver verificationVerifying detection of uplink signal
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LTE base station receiver verificationCustomized uplink test signals as stimuli
l Simulation of up to 4 terminalsl Uplink data (PUSCH)l Uplink control (PUCCH)l Uplink channel codingl Demodulation reference signall Sounding reference signall Frequency hopping
Screenshot of R&S SMU200AScreenshot of R&S SMU200A
July 2008 | LTE T&M | 14
LTE base station receiver verificationUplink sounding and demodulation reference signals
Screenshots of R&S SMU200AScreenshots of R&S SMU200A
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LTE TDD signal generation
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R&S Unique MIMO solution
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Vector signal generator R&S SMU200A providesLTE downlink signals from 2 TX antennas
Including MIMO channel simulation
MIMO device under test
2x2 MIMO receiver verification with a one-box setup
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MIMO receiver verification with R&S SMU200A
MIMO Fading (R&S SMU-K74)
Code wordand precodingselection for
MIMO
TX1TX1
TX2TX2
Screenshot of R&S SMU200AScreenshot of R&S SMU200A
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Downlink MIMO receiver verificationConfiguring MIMO mode and precoding
l MIMO data precoding per allocation
Screenshot of R&S SMU200AScreenshot of R&S SMU200A
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Downlink MIMO receiver verificationSignal paths
Channel AA
Screenshot of R&S SMU200AScreenshot of R&S SMU200A
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Channel BB
Downlink MIMO receiver verificationSignal paths
Screenshot of R&S SMU200AScreenshot of R&S SMU200A
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Channel AB
Downlink MIMO receiver verificationSignal paths
Screenshot of R&S SMU200AScreenshot of R&S SMU200A
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Channel BA
Downlink MIMO receiver verificationSignal paths
Screenshot of R&S SMU200AScreenshot of R&S SMU200A
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Complex correlation matrix
ChannelAA
ChannelAB
ChannelBA
ChannelBBScreenshots of R&S SMU200AScreenshots of R&S SMU200A
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What does correlation mean illustrative?
Zero correlation
80% correlation
100% correlation
July 2008 | LTE T&M | 26
LTE MIMO channel model supported
l Particularly relevant for receiver performancetests
l Extension to traditional ITU fading models(tapped delay line) required to cover higherbandwidths of LTE and MIMO operation
l Propagation conditions agreed in 3GPP for:l Extended pedestrian A (EPA)l Extended vehicular A model (EVA)l Extended Typical Urban model (ETU)
l Definition of delay profile, Doppler spectrumand set of correlation matrices describingcorrelation between UE and BS antennas
July 2008 | LTE T&M | 27
MIMO receiver testCollaborative uplink / Multi user MIMO
data
Coding Fading on the air interface
data
UE 1
UE 2
July 2008 | LTE T&M | 28
Unique LTE/MIMO signal generation solution
R&S® SMU200A• Vector signal generator• LTE signal generation• Dual channel baseband + RF• Fading + AWGN simulator option• 2x2 MIMO option K74•
R&S® AMU200A
• Baseband signal generator• LTE signal generation• Stand-alone baseband
fading + AWGN simulator• Dual channel baseband in/out• 2x2 MIMO option K74
dual channel RF
dual channel I/Q
July 2008 | LTE T&M | 29
Signal analyzer FSQanalyzes LTE uplink/downlink signal
Device under test
(base station or UE)
Evaluation of:Power, spectrum, constellation, modulationquality, Error Vector Magnitude (EVM),frequency error, crest factor,…
First challenge in BS and UE transmitter verificationVerifying key signal characteristics and quality
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LTE Signal analysis
l Available today for signal analyzersFSQ/FSG with software optionsl FSQ-K100 (LTE downlink OFDMA analysis)l FSQ-K101 (LTE SC-FDMA uplink analysis)l FSQ-K102 (MIMO analysis)l New software option for LTE TDD
l Available as external PC software;integration within FSQ planned when3GPP specifications stabilize
l Wide range of measurements in nicegraphical presentation: modulationquality, EVM, constellation, spectrum,frequency error, CCDF,…
l Auto demodulation featurel Automatic detection of cyclic prefix
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Analysing uplink and downlink LTE signals
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LTE MIMO analysis (Software Option FSQ-K102)
l Supports 2x2 and 4x4 MIMOl Supports
l Transmit Diversityl Spatial multiplexingl Cyclic delay diversity
l Measurements are possible on single antennas or combined
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LTE MIMO analysis (Software Option FSQ-K102)MIMO transmitter tests on multiple antennas
DUT
PrecodedMIMO Signal
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LTE TDD signal analysis
July 2008 | LTE T&M | 35
R&S solutions for Signal Analysis
R&S® FSQ•High end spectrum analyzer up to 40 GHz•Up to 120 MHz demodulation bandwidth•Base band inputs analog and digital•Support for all 2G and 3G standards
R&S® FSG•Spectrum analyzer up to 13.6 GHz•Performance close to FSQ•28 MHz demodulation bandwidth•Support for all 2G and 3G standards
July 2008 | LTE T&M | 36
LTE RF Testing AspectsUE/BS requirements according to 3GPP�Transmitter Characteristics:
� Transmit power� Frequency error� Output power dynamics� Output RF spectrum emissions� Transmit intermodulation� Modulation quality, Error Vector
Magnitude� …
�Receiver characteristics:� Reference sensitivity level� UE maximum input level� Adjacent channel selectivity� Blocking characteristics� Intermodulation characteristics� Spurious emissions� …
�Performance requirements
July 2008 | LTE T&M | 37
UE protocol testing for LTE / EUTRA
July 2008 | LTE T&M | 38
CMW500 for LTE Protocol Test
July 2008 | LTE T&M | 39
CMW500 for LTE Protocol Test
July 2008 | LTE T&M | 40
CMW500 LTE Tester Key Featuresl Fully 3GPP Rel-8 compliant LTE protocol tester
l LTE Layer1, Layer2, Layer3 including NAS and user plane supportl Based on 3GPP baseline 2008-03, quarterly updates to latest 3GPP
specifications
l RF Interfacel 20 MHz bandwidth (incl. 1.4, 3, 5, 10, 15 MHz)l Supports all 3GPP frequency bands up to 3.3 GHz (extension to 6 GHz)
l Digital I/Q Interfacel Supports protocol testing in real-time or with reduced clockl Different digital IQ interface standards possible via external adapter (Ex-
IQ box)
l Fadingl Digital baseband fading with R&S SMU200A and R&S AMU200A
l Supports host based virtual protocol testing for LTE L2 and L3stack development (Virtual PHY)
July 2008 | LTE T&M | 41
CMW500 LTE Tester Key Features
l Prepared for TX Diversity and MIMO 2x2 (later MIMO 4x2)
l Prepared for multi-cell and multi-mode LTE testingl Highly scalable hardware to support multi-cell and multi-RAT handover
testing in one box
l Powerful programming interfaces for rapid development ofsignaling test casesl R&D testing: C++ API, eg. LLAPI (L2), MLAPI (L3) – backwards
compatible with R&S 3G protocol testerl Conformance testing: TTCN-3 API and runtime libraries
l Proven mobile communications software tools for test casedevelopment, test campaign management and log file analysis
July 2008 | LTE T&M | 42
CMW500 for LTE Protocol TestTest Definition Interfaces
LTE LLAPIEarly R&D Protocol
Testing
LTE LLAPIEarly R&D Protocol
Testing
• No finalized 3GPP Layer 3specification and ASN.1required
• Full flexibility for lowerlayer configuration
• LLAPI is the ideal interfacefor early stage LTE protocoltesting
• No finalized 3GPP Layer 3specification and ASN.1required
• Full flexibility for lowerlayer configuration
• LLAPI is the ideal interfacefor early stage LTE protocoltesting
LTE MLAPIProtocol Testing
LTE MLAPIProtocol Testing
LTE TTCN-3Conformance Testing
LTE TTCN-3Conformance Testing
3311 22
• TTCN-3 = Testing and TestControl Notation - 3
• TTCN-3 already used forGCF WI-031 “3GPP IMS CallControl Rel-5 and Rel-6”
• TTCN-3 = Testing and TestControl Notation - 3
• TTCN-3 already used forGCF WI-031 “3GPP IMS CallControl Rel-5 and Rel-6”
• Considerable reduction ofsource code by automaticlower layer configuration
• High scenario re-use factor• Requires a finalized
Layer 3, ASN.1 specification
• Considerable reduction ofsource code by automaticlower layer configuration
• High scenario re-use factor• Requires a finalized
Layer 3, ASN.1 specification
R&D R&D
IOT
Conf.
July 2008 | LTE T&M | 43
LTE Virtual TesterDetailed Block Diagram
LTE Virtual Tester UE Protocol Stack SW under Test
Test Cases
RRC
RRC Configurator
MAC
RLC
PDCP
MLAPI
LLAPI
Test Adaptation Layer
Physical Interface Adapter
MLAPI TestScenarios
LLAPI TestScenarios
MAC
RLC
PDCP
RRC
MMI
UE Adaptation Layer
Physical Interface Adapter
VTAPI
VTIPI
R&S LTEVirtual Tester
July 2008 | LTE T&M | 44
Protocol Testing for LTE R&DSW Tools
MS Visual Studio
TestSuite Explorer
Message Composer
Project Explorer
Message Analyser
C++ LLAPI / MLAPIScenario
- analyse results- export constraints
- define sequences- execute- manage results
- compose send& receive constraints
- develop- build
- define configuration- manage Suites
July 2008 | LTE T&M | 45
Protocol Testing for LTE R&DR&S Project Exporer
July 2008 | LTE T&M | 46
Protocol Testing for LTE R&DR&S Message Composer
July 2008 | LTE T&M | 47
Protocol Testing for LTE R&DR&S Message Analyzer
July 2008 | LTE T&M | 48
More reading…Application Notes 1MA111 and RSI004
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Thank you for your attention!
Comments and questionswelcome!