Post on 10-Feb-2018
transcript
1 © Nokia Siemens Networks Dr. Thomas Haustein / December 2007
Real-Time Experiments with a Scalable MIMO-OFDM Air-Interface –
Outdoor Measurements in Typical Urban Environments
PANU & MITSE workshop17th December 2007
Dr. Thomas Haustein, Dr. Egon SchulzCOO RTP PT RST CT Munich
2 © Nokia Siemens Networks Dr. Thomas Haustein / December 2007
Scalable MIMO OFDMA demonstrator
3 GSM World Congress
Barcelona, 2007
ITU Telecom World
Hong Kong, 2006
Experimental UE
Carrier Frequency: 2.6 GHz (UMTS Extension band)Duplex: FDDScalable Bandwidth: 20 MHz, 10 MHz, 5 MHzData rate @ 20 MHz: 200Mbps (DL), >50 Mbps (UL) Transmission Time Interval (TTI): 0.5 msModulation schemes:
Downlink OFDMA (64QAM, 16QAM, QPSK)Uplink SC-FDMA (16QAM, QPSK, BPSK)
Antenna techniques:Downlink 2x2 MIMOUplink 2x2 MIMO, SDMA, Rx-Diversity
CQI based Link Adaptation (DL) Time, Frequency, Space
Portable 19 inch / 3HULocal Management Terminal
LSUEuropean Road Show Outdoor MeasurementsBerlin, October 2007
3 © Nokia Siemens Networks Dr. Thomas Haustein / December 2007
Base Station
Antennas developed with Kathrein: 1900-2700 MHz
Formfactors
UE 19’’ rack
LMT
4 © Nokia Siemens Networks Dr. Thomas Haustein / December 2007
Baseband and RF
A Flexible Hardware Concept
6 © Nokia Siemens Networks Dr. Thomas Haustein / December 2007
LTE nodeB
RF-units
Duamco
LSU – LTE Server Unit
8 © Nokia Siemens Networks Dr. Thomas Haustein / December 2007
LTE User Equipment
Touchpanel for UE control
Gigabit Ethernet hub for clients
USB for LMT & Firmware upload
9 © Nokia Siemens Networks Dr. Thomas Haustein / December 2007
LMT – the Local Maintenance Terminal Online Features & Measurement modes
Received power per antenna pair
Impuls responses in f-domainper antenna pair
Reconstructed QAM symbols from Tx 1 & Tx 2
Bit-loading map per Tx antenna
Uncoded & coded BER DL CFO
Rate per UE and aggregated rate at BS
10 © Nokia Siemens Networks Dr. Thomas Haustein / December 2007
MIMO-OFDM Experiments
Measurements in Outdoor ScenariosFirst Steps towards Cellular LTE
11 © Nokia Siemens Networks Dr. Thomas Haustein / December 2007
Outdoor Measurements Single User & Multi-User Scenarios
•Single User transmission DL: – DL 2x2 MIMO, fast link adaptation in DL, 20 MHz– UL 1x2 MRC, DFT pre-coding, QPSK, 5MHz– UE works in closed loop mode– Lists of CQI values, Rates, BERs and channel measurements are
recorded
• MU Scheduling in DL:– 1 BS, 2 UEs using 1 Tx each in UL, TDMA & QPSK for control
channel– 2 UEs calculate individual link adaptation in DL (prefered MCS
choice, MIMO mode, CQI)– Scheduler at BS decides frequency adaptive resource alloc. (e.g.
max rate or Prop Fair)
12 © Nokia Siemens Networks Dr. Thomas Haustein / December 2007
Outdoor Measurements Measurement Equipment
13 © Nokia Siemens Networks Dr. Thomas Haustein / December 2007
Adaptive Multi-Antenna Gains in Outdoor Scenarios
Measurements near NSN facilities in Munich
A
B
C
14 © Nokia Siemens Networks Dr. Thomas Haustein / December 2007
Single and dual stream selection and achieved sum throughput in scenario
Distribution of single stream and dual stream selection
Allocated Modulation on RBs and Tx antennas
Ach
ieve
d R
ate
[Mbi
t/s]
A
B
C
SIMO Tx1SIMO Tx2MIMO
Ach
ieve
d R
ate
[Mbi
t/s]
A
B
C
15 © Nokia Siemens Networks Dr. Thomas Haustein / December 2007
Adaptive Multi-Antenna Gains in Outdoor ScenariosMeasured throughput distribution in scenario
16 © Nokia Siemens Networks Dr. Thomas Haustein / December 2007
Adaptive Multi-Antenna Gains in Outdoor ScenariosThroughput Distribution and MIMO Selection Probability
-- dual stream / MIMO
-- single stream
Balance PointThroughput Balance Point:Dual-Stream allocated RBsachieve same throughput as single stream alloceted RBs, but dual stream mode has higher spectral efficiency.
Selection Balance Point:Number of RBs in Dual-Stream is equal to those in single stream mode. Multiuser diversity will shift thisposition towards lower SNR.
17 © Nokia Siemens Networks Dr. Thomas Haustein / December 2007
Multi-user Transmission Scenarios
BS
Downlink •UEs measure the downlink channel quality based on the pilots transmitted from the base station
•Each UE is calculating MCS and MIMO modes for each RB considering the applied MIMO detector
18 © Nokia Siemens Networks Dr. Thomas Haustein / December 2007
Multi-user Transmission Scenarios
BS
Downlink
•CQI values are fed back to the base station via a dedicated control channel.
•The BS scheduler is performing the frequency adaptive resource allocation and transmitting the final resource map to all UEs.
data
feedback channel
data
MIMOradio channel
adaptive Tx
Rx withrealtimesignal
processing
frequency
19 © Nokia Siemens Networks Dr. Thomas Haustein / December 2007
Multi-user Scheduling with Link AdaptationProposed MCS levels from UE0 Scheduler Input
----- single stream----- dual stream / MIMO
20 © Nokia Siemens Networks Dr. Thomas Haustein / December 2007
Multi-user Scheduling with Link Adaptation Proposed MCS levels from UE1 Scheduler Input
----- single stream----- dual stream / MIMO
21 © Nokia Siemens Networks Dr. Thomas Haustein / December 2007
Multi-User Scheduling – Scheduler Output with Proportional Fair Scheduling including SDMA
data from measurement 17
22 © Nokia Siemens Networks Dr. Thomas Haustein / December 2007
Multi User Scheduling – Results BERs
UE 1
UE 0
23 © Nokia Siemens Networks Dr. Thomas Haustein / December 2007
LTE-Outdoor ExperimentsMulti-User Scheduling
2 UEs moved at the NSN facilities in MunichMultipath environment, no LOS to BS
24 © Nokia Siemens Networks Dr. Thomas Haustein / December 2007
LTE-Outdoor ExperimentsResults in Multi-User Scheduling
26 © Nokia Siemens Networks Dr. Thomas Haustein / December 2007
Multi-Antenna Gains in Outdoor Scenarios– Campus Scenario: 2,6 GHz, BW: 20 MHz, BS @ 60 m height
BS BS
v~3-5 km/h MIMO/SIMOSISO
27 © Nokia Siemens Networks Dr. Thomas Haustein / December 2007
Measured Throughput with different Multi-Antenna Configurations
•Configurations: -Campus scenario -2 UEs co-located in one car -x-pol. Rx antennas at UEs-pedestrian speed -MIMO: 2Tx, 2Rx -frequency adaptive LA
28 © Nokia Siemens Networks Dr. Thomas Haustein / December 2007
Measured Throughput of copplarized vs. cross-polarized Tx-Antennas at nodeB
•Configurations: -Campus scenario -2 UEs co-located in one car -x-pol. Rx antennas at UEs-pedestrian speed -MIMO: 2Tx, 2Rx -frequency adaptive LA
29 © Nokia Siemens Networks Dr. Thomas Haustein / December 2007
Measurement of coplanar vs. cross-polarized Antennas Polarization & Multi-user Gain
30 © Nokia Siemens Networks Dr. Thomas Haustein / December 2007
BS Site: HHI Building
Early LTE MeasurementsScaleNet Demonstrator
Berlin, Nov 2007
COO RTP PT RST
MIMO/SIMO
DLink
900 m
600 m
300 m
Ernst Reuter Platz
Urban, 5 – 40 km/h20 MHz, 2.6 GHz, Tx power: 34 dBm11 dBi antenna gainAdaptive MIMO
31 © Nokia Siemens Networks Dr. Thomas Haustein / December 2007
Single Sector Coverage MIMO supporting areas in the sector
-- Single Stream-- Dual Stream / MIMO
300 m
600 m
900 m
Urban, 5 – 40 km/h20 MHz, 2.6 GHz, Tx power: 34 dBm11 dBi antenna gainAdaptive MIMO
Early LTE MeasurementsScaleNet Demonstrator
Berlin, Nov 2007
COO RTP PT RST
BS Site: HHI Building
Ernst Reuter Platz