802.20 Session # 23, March 2007, Orlando, Florida, USA · 2007-03-06 · 802.20 Session # 23, March 2007, Orlando, Florida, USA Submission IEEE C.802.20-07/13 3 Out-of-Band Emissions

802.20 Session # 23, March 2007, Orlando, Florida, USA

1IEEE C.802.20-07/13Submission

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Notice

For consideration by 802.20 as it evaluates proposals for FDD MBWA.Purpose

This contribution contains the presentation of the UMBFDD PerformanceReport 1 results.

Abstract

MBWA Call for Proposals (802.20 - 07/02) Re:

1-847-632-4201, [email protected], [email protected], [email protected]

Al Jette, Shirish Nagaraj, Val Oprescu

Source(s)

5 March 2007Date Submitted

UMBFDD Performance Report 1 PresentationTitle

IEEE 802.20 Working Group on Mobile Broadband Wireless Access <http://grouper.ieee.org/groups/802/20/>

Project



UMBFDD Performance Report I

Presentation



Out-of-Band Emissions• Spectral shape of 5MHz transmitted, modulated carriers shown• Both meet FCC emissions spec

Forward Link• 512 sub-carriers spaced 9600Hz

center-to-center, including 16 guard subcarriers on each side

• Remaining 480 sub-carriers are QPSK-modulated

• Feedforward power amplifier based on the Rapp model, 8dB backoff

Reverse Link• Full band hopping, two tiles of

subcarriers• Amp based on Rapp model, 6.5dB

backoff



Peak Data Rates

Bandwidth 1.25 MHz 5 MHz Parameter

Downlink Uplink Downlink Uplink Peak User Data Rate Requirement 4.5 Mbps 2.25 Mbps 18 Mbps 9 Mbps

UMBFDD Peak User Data Rate Achieved 17Mbps 4Mbps 87Mbps 21Mbps



• Performed in accordance with the procedures given in Evaluation Criteria document.

• Smoother thirty-drop curve is a consequence of having many more random lognormal draws.

-20 -15 -10 -5 0 5 10 15 200

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

Location File - 1 dropLocation File - 30 drops

Pro

babi

lity

that

C/I ≤

Abs

ciss

a

Location Calibration



Simulation Parameters (1)

Units Downlink UplinkCarrier Frequency Ghz 1.9 1.9Bandwidth of Operation MHz 5 5

Site Layout 19 cells/57 sector hex grid with wraparound

19 cells/57 sector hex grid with wraparound

Site separation km 1, 2.5 1, 2.5Minimum separation between AT and BTS m 35 35Subcarrier Spacing kHz 9.6 9.6Sampling Rate Mcps 4.9152 4.9152FFT size 512 512

Guardband subcarriers 32 32

Cyclic Prefix μs 6.51 6.51 (pedB) 13.02 (vehB)

OFDM symbol length μs 113.93 113.93 (pedB) 120.44 (vehB)

# of OFDM symbols per frame 8 8# of subcarriers per symbol per subchannel 16 16# of HARQ Interlaces 8 8Max Number of HARQ attempts 6 6Source Model Full Buffer Full BufferPilot Overhead % 14.84 14.06Control overhead % 10 10



Simulation Parameters (2)

Units Downlink Uplink

ITU Channel Model Usage100% pedB/3 kph

100% vehB/120 kph (no mix)

100% pedB/3 kph 100% vehB/120 kph

(no mix)

Propagation model Hata, 31.5 intercept, 35 dB slope

Hata, 31.5 intercept, 35 dB slope

Lognormal Shadowing standard deviation dB 10 10Site-to-site correlation coefficient 0.5 0.5Noise Floor dBm/Hz -174 -174Receiver noise figure dB 10 5Max Tx Power dBm 50 27Penetration Loss dB 10 10Body Loss dB 3 3

Antenna pattern - BTS - Horizontal 3dB bandwidth: 70 deg, 20 dB max atten

3dB bandwidth: 70 deg, 20 dB max atten

Antenna pattern - BTS - Vertical not modeled not modeledAntenna height - BTS m 32 32Antenna height - AT m 1.5 1.5Antenna gain - BTS (including cable loss) dBi 14 14Antenna gain - AT dBi 0 0Maximum C/I per antenna dB 30 30# of Tx Antennas 4 1# of Rx Antennas 4 2, 8Scheduler Proportional Fair Proportional Fair



NULL15

4466669.514

4446668.013

4446667.012

4444666.011

4444665.010

4444664.59

4444664.08

4444463.57

4444463.06

3334462.55

3333342.04

3333341.53

2222220.942

2222220.671

2222220.330

6+54321

Modulation Order For Each TransmissionSpectral Efficiency on First

Transmission

Packet Format Index

Downlink Packet Formats



Uplink Packet Formats

• 64 QAM not modeled• Modulation step-down not modeled

– packet formats were modified to accommodate

Modulation Order For Each Transmission Packet Format Index

Spectral Efficiency on

First Transmission

1 2 3 4 5 6+

0 0.36 2 2 2 2 2 2

1 0.71 2 2 2 2 2 2

2 1.07 2 2 2 2 2 2

3 1.4 3 3 3 3 3 3

4 1.8 3 3 3 3 3 3

5 2.13 4 4 4 4 4 4

6 2.5 4 4 4 4 4 4

7 3.0 4 4 4 4 4 4



ECM Validation Curves

• Link-to-system mapping used is Equivalent SNR Method based on Convex Metric (ECM)• Effectively same as one proposed to the 802.20 working group: Effective SNR• Validated with AWGN, Ped B and Veh B, for SIMO transmissions• Result: mapping method is accurate - all channel models show near-identical results for

FER vs. Effective SNR



Geometry Curves

• Shown are long-term results of FER vs. geometry for: – two models of the system with – three levels of modulation and coding

• Ideal channel estimation is used



Downlink System Simulation

Results



Downlink Fairness

0 1 2 3 4 5 6 7 8 90

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

Normalized Mobile Throughput

Prob(NMT<=Abscissa

Fairness Criterion4x4 pedB 1000m4x4 pedB 2500m4x4 vehB 1000m4x4 vehB 2500m

Pro

babi

lity(

NM

T ≤

Abs

ciss

a)

16 Users/Sector

0 1 2 3 4 5 60

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1


Prob(NMT<=Abscissa

Fairness Criterion4x4 pedB 1000m4x4 pedB 2500m4x4 vehB 1000m4x4 vehB 2500m

Pro

babi

lity(

NM

T ≤

Abs

ciss

a)

8 Users/Sector



-20 -15 -10 -5 0 5 10 15 20 250

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2x 107

SINR dB

Throughput bps

Throughput vs. SINR

• Throughput derived from FER vs. SINR• Each packet format produces particular throughput for

given number of required transmissions. • All of these packet format throughputs are presented in

hull curves below

Thro

ughp

ut (b

ps)



BTS Antenna System• Is a uniform linear 4-element array, producing four fixed beams.• Switched beams have been shown to be a good choice for achieving high capacity• Each element has Gaussian antenna pattern• Half-power beamwidth is 70 degrees, • Front-to-back ratio is 20dB.



Downlink Aggregate Throughput

• Four fixed beams were used in each sector.

# of Antennas Channel Model # of Users/Sector

Site-to-Site Separation

(km)

Sector Throughput

(kbps)

4x4 3kph/PedB 8 1 16241

4x4 120kph/VehB 8 1 13111

4x4 3kph/PedB 16 1 19969

4x4 120kph/VehB 16 1 15431

4x4 3kph/PedB 8 2.5 15542 4x4 120kph/VehB 8 2.5 12687

4x4 3kph/PedB 16 2.5 18731

4x4 120kph/VehB 16 2.5 13454



Downlink Spectral Efficiency

• Assumes a 5 MHz bandwidth assignment and a 1km site separation

• Minimum requirements (per PAR):

– 3 kph, PedB 2.0 (b/s/Hz/sector)– 120 kph, VehB 1.5

• Achieved:

– 3 kph, PedB 3.99– 120 kph, VehB 3.09



Downlink Mobile Throughput

• CDF of Mobile Throughput shown

0 2000 4000 6000 8000 10000 120000

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

Mobile Throughput (kbps)

Prob(MT<=Abscissa

4x4 pedB 1000m4x4 pedB 2500m4x4 vehB 1000m4x4 vehB 2500m

Pro

b(M

T≤

Abs

ciss

a)

16 Users/Sector8 Users/Sector

0 2000 4000 6000 8000 10000 120000

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1


Prob(MT<=Abscissa

4x4 pedB 1000m4x4 pedB 2500m4x4 vehB 1000m4x4 vehB 2500m

Pro

b(M

T≤

Abs

ciss

a)



0 0.5 1 1.5 2 2.5 30

2

4

6

8

10

12

14

16

18

394kbps 325kbps

647kbps 560kbps

Site-to-Site Distance (km)

# of Users/Sector

0 0.5 1 1.5 2 2.5 30

2

4

6

8

10

12

14

16

18

531kbps 439kbps

850kbps 704kbps


# of Users/Sector

Number of Users vs BTS separation at Minimum Service Level#

Use

rs p

er s

ecto

r

# U

sers

per

sec

tor

120kph/Vehicular B3kph/Pedestrian B



0 0.5 1 1.5 2 2.5 3 3.51.2

1.25

1.3

1.35

1.4

1.45

1.5

1.55

1.6

1.65

1.7x 104

394kbps (16 users)

325kbps (16 users

647kbps (8 users)

560kbps (8 users)


Aggregate Throughput/Sect

0 0.5 1 1.5 2 2.5 3 3.51.5

1.6

1.7

1.8

1.9

2

2.1x 104

531kbps (16 users)

439kbps (16 users)

850kbps (8 users)

704kbps (8 users)


Aggregate Throughput/Sect

Aggregated Throughput vs. Base Station Separation at Minimum Service Level

Agg

rega

te T

hrou

ghpu

t /se

c

Agg

rega

te T

hrou

ghpu

t /se

c




0 0.5 1 1.5 2 2.5 3 3.52.4

2.5

2.6

2.7

2.8

2.9

3

3.1

3.2

3.3

394kbps (16 users)

325kbps (16 users

647kbps (8 users)

560kbps (8 users)


Spectral Efficiency (b/

0 0.5 1 1.5 2 2.5 3 3.53

3.2

3.4

3.6

3.8

4

4.2

531kbps (16 users)

439kbps (16 users)

850kbps (8 users)

704kbps (8 users)


Spectral Efficiency (b/

Spectral Efficiency vs. Base Station Separation at Minimum Service Level

Spe

ctra

l Effi

cien

cy

Spe

ctra

l Effi

cien

cy




Uplink System Simulation

Results



Uplink Fairness

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

0 0.5 1 1.5 2 2.5 3


1km 2rx1km 8rx2.5km 2rx2.5km 8rxCriterion



Uplink Spectral Efficiency

• Assumes a 5 MHz bandwidth assignment and a 1km site separation

• Minimum requirements (per PAR):

– 3 kph, PedB 1.0 (b/s/Hz/sector)– 120 kph, VehB 0.75

• Achieved:

– 3 kph, PedB 1.23– 120 kph, VehB 1.02



39842.516120kph/VehB848062.5163kph/PedB8

26462.516120kph/VehB230632.5163kph/PedB240042.58120kph/VehB847812.583kph/PedB8

27472.58120kph/VehB231632.583kph/PedB25103116120kph/VehB861731163kph/PedB83121116120kph/VehB236411163kph/PedB2

511818120kph/VehB86095183kph/PedB8318918120kph/VehB23701183kph/PedB2

Sector Throughput (kbps)

Site-to-Site Separation (km)# of Users/SectorChannel Model# of Antennas

Average Uplink Throughput per Sector



Uplink Mobile Throughput – PedB, 8 users/sector

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000


1km 2rx1km 8rx2.5km 2rx2.5km 8rx

0

0.05

0.1

0.15

0.2

0.25

0.3

0 50 100 150 200 250 300 350



Uplink Mobile Throughput – PedB, 16 users/sector

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

0 500 1000 1500 2000 2500 3000


1km 2rx1km 8rx2.5km 2rx2.5km 8rx

0

0.05

0.1

0.15

0.2

0.25

0.3

0 50 100 150 200



Minimum Service Level Throughput – PedB• 80% mobile throughput (red) vs. user load and site to site distance.

Minimum Service Level Throughput (kbps) 2 Rx Antennas

93 52

57 38

0

2

4

6

8

10

12

14

16

18

0.0 0.5 1.0 1.5 2.0 2.5 3.0

Site to Site Distance (km)

# of

Use

rs/S

ecto

r


183 157

110 92

0

2

4

6

8

10

12

14

16

18

0.0 0.5 1.0 1.5 2.0 2.5 3.0

Site to Site Distance (km)#

of U

sers

/Sec

tor



Uplink Minimum Service Level Throughput vs. Aggregate Sector Throughput vs. Site Separation – PedB• 80% mobile throughput (red) vs. average sector throughput and site to site distance.


93 (8 users)

52 (8 users)

57 (16 users)

38 (16 users)

3000

3100

3200

3300

3400

3500

3600

3700

3800

0.0 0.5 1.0 1.5 2.0 2.5 3.0


Aggr

egat

e Th

roug

hput

/Sec

tor (

kbps

)

Minimum Service Level Throughput (kbps)8 Rx Antennas

183 (8 users)

157 (8 users)

110 (16 users)

92 (16 users)

4700

4900

5100

5300

5500

5700

5900

6100

6300

0.0 0.5 1.0 1.5 2.0 2.5 3.0

Site to Site Distance (km)Ag

greg

ate

Thro

ughp

ut/S

ecto

r (kb

ps)



Uplink Minimum Service Level Throughput vs. Spectral Efficiency vs. Site Separation – PedB• 80% mobile throughput (red) vs. spectral efficiency and site to site distance.


93 (8 users)

52 (8 users)

57 (16 users)

38 (16 users)

0.60

0.62

0.64

0.66

0.68

0.70

0.72

0.74

0.76

0.0 0.5 1.0 1.5 2.0 2.5 3.0


Spec

tral E

ffici

ency

Minimum Service Level Throughput (kbps)8 Rx Antennas

183 (8 users)

157 (8 users)

110 (16 users)

92 (16 users)

0.90

0.95

1.00

1.05

1.10

1.15

1.20

1.25

1.30

0.0 0.5 1.0 1.5 2.0 2.5 3.0

Site to Site Distance (km)Sp

ectra

l Effi

cien

cy

Documents

802.20 Session # 23, March 2007, Orlando, Florida, USA · 2007-03-06 · 802.20 Session # 23, March 2007, Orlando, Florida, USA Submission IEEE C.802.20-07/13 3 Out-of-Band Emissions