Wireless Sensor Network Platforms - Datasheets versus Measurements · · 2011-10-05Wireless...

Wireless Sensor Network Platforms −Datasheets versus Measurements

ITG Fachgruppen 5.2.1/5.2.4

Peter [email protected]

University Bremen, Germany

29th of September 2011

Peter Trenkamp:WSN Platforms - Datasheets versus Measurements 1 / 21

Outline

Introduction

Datasheet based Evaluation

Measurement based EvaluationSerial InterfaceRadio Frequency InterfaceUnmodulated Carrier MeasurementRF Output Power vs. Supply VoltageOutdoor Line-of-Sight Measurement

Conclusion & Outlook


Introduction

I Antenna / Externalantenna connector

I RF interfaceI Serial interfaceI MicrocontrollerI Other peripherals

Zolertia’s Sensor Mote: "Z1"


Datasheet Evaluation of the Components

WSN Mote→ TelosB ZigBit Amp Z1 CM3300Radio Chip CC2420 AT86RF230 CC2420 CC2420RF OutputWSN Mote 0/-25 dBm 20/0 dBm 0/-25 dBm 20/-5 dBm(Max/Min)Sensitivity -94 dBm -104 dBm -95 dBm -103 dBmWSN MoteLink Budget 95 dB 124 dB 95 dB 123 dB

Micro- MSP- Atmega- MSP- MSP-controller 430F1611 1281V 430F2617 430F1611

Baud Rate 115200 57600 115200 115200


Throughput Measurements on the Serial InterfaceTelosB

ZigBit Amp

Z1

CM3300

Serial Connection

(USB)

Notebook

Measurement Setup

Inter-send time in binary milli seconds: IST = 62, 30, 24, 22, 20, 18, 16, 14, 12, 10, 8, 6, 4, 3 mis


Throughput Measurements on the Serial Interface

0 20 40 60 80 100Offered Traffic [kbit/s]

0

20

40

60

80

100Ca

rrie

d Tr

affic

[kbi

t/s]

Carried Traffic vs. Offered Traffic for a 34 byte Message Comparison of different Platforms

Theoretic LimitTelosBZigBit AmpZ1CM3300


Throughput Measurements on the Radio Interface

TelosB

ZigBit Amp

Z1

CM3300

TelosB

ZigBit Amp

Z1

CM3300

Radio Link

Notebook

USB Connection

Sender Receiver

Measurement Setup

IST = 124, 62, 30, 24, 22, 20, 18, 16, 14, 12, 10, 8, 6, 4 mis


Throughput Measurements on the Radio Interface


20

40

60

80

100

Carr

ied

Traf

fic [k

bit/s

]

Carried Traffic vs. Offered Traffic for a 45 byte MessageBasestation: Refer to Legend / Sending Mote: TelosB


Throughput MeasurementsSending Mote: TelosB


20

40

60

80

100

Carr

ied

Traf

fic [k

bit/s

]

Carried Traffic vs. Offered Traffic for a 45 byte MessageBasestation: Refer to Legend / Sending Mote: ZigBit Amp


Throughput MeasurementsSending Mote: ZigBit Amp


Maximum Throughput (Serial and Radio Interface)

WSN Mote→ TelosB ZigBit Amp Z1 CM3300

Serial 46.4 kBit/s 23.2 kBit/s 69.6 kBit/s 46.4 kBit/sInterface

Radio IF 49.4 kBit/s 35.6 kBit/s 82.9 kBit/s 50.8 kBit/s(receive)

Radio IF 24.8 kBit/s 82.9 kBit/s 29.5 kBit/s 25.3 kBit/s(send)


Unmodulated Carrier Measurement

Spectrum Analyzer

CM3300

Z1

TelosB

RF Connection(Coax Cable)

Measurement Setup

2479.6 2479.7 2479.8 2479.9 2480.0 2480.1 2480.2 2480.3 2480.4Frequency [MHz]

50

40

30

20

10

0

Pow

er S

pect

ral D

ensi

ty [d

Bm/H

z]

Center Frequencyof Channel 26

Spectral Analysis using Unmodulated Single Carrier (USB Powered)

Z1 rc0163 Carrier Power (max): -4.6 dBmZ1 rc0149 Carrier Power (max): -4.63 dBm

USB Powered

2479.6 2479.7 2479.8 2479.9 2480.0 2480.1 2480.2 2480.3 2480.4Frequency [MHz]

50

40

30

20

10

0

Pow

er S

pect

ral D

ensi

ty [d

Bm/H

z]

Center Frequencyof Channel 26

Spectral Analysis using Unmodulated Single Carrier (1.48V Battery Powered)

Z1 rc0163 Carrier Power (max): -4.8 dBmZ1 rc0149 Carrier Power (max): -4.74 dBm

Battery Powered


Results of the Unmodulated Carrier Measurement

WSN Mote→ TelosB ZigBit Amp Z1 CM3300RF OutputWSN Mote 0 dBm 20 dBm 0 dBm 20 dBm(Datasheet)RF OutputWSN Mote -1.03 dBm N/A -4.60 dBm 12.52 dBm

(Meas.)Deviation 1.03 dB N/A 4.60 dB 7.48 dB

(Log.)


RF Output Power versus the Supply Voltage

1.0 1.5 2.0 2.5 3.0Battery Voltage [V]

2.4

2.2

2.0

1.8

1.6

1.4

1.2

1.0

Outp

ut P

ower

[dBm

]

Battery Power vs. Output Power using Single Carrier Test Mode (Channel 11)

Z1: rc0149 max. Output Power: -1.85 dBmZ1: rc0163 max. Output Power: -1.7 dBm

Sending Mote: Z1

1.0 1.5 2.0 2.5 3.0Battery Voltage [V]

15

10

5

0

5

10

15

20

Outp

ut P

ower

[dBm

]

Battery Power vs. Output Power using Single Carrier Test Mode (Channel 11)

CM3300: 1-1 max. Output Power: 12.3 dBmCM3300: 2-2 max. Output Power: 12.49 dBm

Sending Mote: CM3300


Attenuated Signal Performance (Wired)RF Attenuator

Sending Mote

RF Coupler

Computer

Receiving Mote B

Receiving Mote A

RF Connection(Coax Cable)

USB Connection USB Connection

192.168.1.2

192.168.1.1NetworkConnection

- 3 dB

- 3 dB

Measurement SetupPeter Trenkamp:WSN Platforms - Datasheets versus Measurements 13 / 21

Attenuated Signal Performance (Wired) Part I

0 200 400 600 800 1000Sequence Number

100

80

60

40

20

0

RSSI

[dBm

]

Rel. Damping of 0 dB



Sequence Number vs. RSSI with Sending Mote: ZigBit AmpBasestations are shielded by Metallic Box

TelosB RSSI (min): -92 dBm Seq Nr (max): 940 Pkt Lost: 4 ZigBit Amp RSSI (min): -91.0 dBm Seq Nr (max): 832 Pkt Lost: 9 Z1 RSSI (min): -91 dBm Seq Nr (max): 896 Pkt Lost: 180 CM3300 RSSI (min): -90 dBm Seq Nr (max): 971 Pkt Lost: 3

Sending Mote: ZigBit Amp

0 200 400 600 800 1000Sequence Number

100

80

60

40

20

0

RSSI

[dBm

]




Sequence Number vs. RSSI with Sending Mote: CM3300Basestations are shielded by Metallic Box

TelosB RSSI (min): -92 dBm Seq Nr (max): 894 Pkt Lost: 14 ZigBit Amp RSSI (min): -91.0 dBm Seq Nr (max): 759 Pkt Lost: 9 Z1 RSSI (min): -91 dBm Seq Nr (max): 856 Pkt Lost: 5 CM3300 RSSI (min): -89 dBm Seq Nr (max): 912 Pkt Lost: 1

Sending Mote: CM3300


Attenuated Signal Performance (Wired)Part II (Sensitivity)

Sending Mote→ TelosB Z1 ZigBit Amp CM3300dB dB dB dB

Receiving Mote ↓1. CM3300 0.0 0.0 0.0 0.02. TelosB -3.4 -4.8 -3.9 -3.53. Z1 -7.6 -6.4 -9.4 -7.04. ZigBit Amp -19.1 -17.1 -17.4 -19.1


Outdoor Line-of-Sight Measurement

Measurement SetupPeter Trenkamp:WSN Platforms - Datasheets versus Measurements 16 / 21

Outdoor Line-of-Sight MeasurementRSSI Values

0 50 100 150 200 250 300 350 400Distance [m]

100

90

80

70

60

50

40

30

20

RSSI

[dBm

]

Distances vs. RSSI (Mean and Measurement Uncertainty) with Sending Mote: TelosB

Theo. RSSI (min/max): -102.87/-42.79 dBm PTx: -1.0 dBm GTx: 3.3 dB GRx: 5.0 dB TelosB RSSI (min/max): -90.97/-55.42 dBm ZigBit Amp RSSI (min/max): -91.0/-78.98 dBm Z1 RSSI (min/max): -90.64/-67.85 dBm CM3300 RSSI (min/max): -88.71/-45.47 dBm

Sending Mote: TelosB

0 50 100 150 200 250 300 350 400Distance [m]

100

90

80

70

60

50

40

30

20

RSSI

[dBm

]

Distances vs. RSSI (Mean and Measurement Uncertainty) with Sending Mote: ZigBit Amp

Theo. RSSI (min/max): -83.17/-23.09 dBm PTx: 18.0 dBm GTx: 4.0 dB GRx: 5.0 dB TelosB RSSI (min/max): -81.77/-25.93 dBm ZigBit Amp RSSI (min/max): -91.0/-46.72 dBm Z1 RSSI (min/max): -88.37/-38.0 dBm CM3300 RSSI (min/max): -75.37/-26.77 dBm

Sending Mote: ZigBit Amp


Results from the Outdoor Line-of-Sight MeasurementRange Performance

Sending Mote→ TelosB ZigBit Amp Z1 CM3300Distance Distance Distance Distance

Receiving Mote ↓TelosB 112.5 m > 409 m 90 m 290 mZigBit Amp 97.5 m > 409 m 2.6 m 180 mZ1 82.5 m > 409 m 60 m 240 mCM3300 135 m > 409 m 60 m 290 m


Conclusion

I The performance of the 4 platforms differ significantly fromeach other and from the datasheets

I The CM3300 platform shows the best and the Z1 platformshows the worst overall performance in the mentionedtests

I The ZigBit Amp possesses a weak receiver performanceI Asymmetric radio link behavior occurs due to the usage of

different platforms and different voltage levels


Outlook

I Evaluation of further nodesI Further simulation based evaluation of asymmetric radio

links in TOSSIM using Blip 2.0 with MRHOF


Thanks for your attention!


Wireless Sensor Network Platforms - Datasheets versus Measurements · · 2011-10-05Wireless...

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