interference automation jan28

8/6/2019 Interference Automation Jan28

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Empirical study of WirelessStandards for Home Automation

Chengjie Wu, Abu S. Saifullah and Yong Fu


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Outline

Comparison between Wifi, Zigbee and Bluetooth (2

classes)

1. Packet reception rate (PRR)

Number of packets successfully received at receiver over total

number of packets sent by sender

2. Maximum communication range3. PRR under interference of Wifi AP

Performance of Zigbee under interference of Bluetooth

1. Packet lost rate

2. Anti interference

2


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Outline


classes)

1. Packet reception rate

2. Maximum communication range

3. PRR under interference of Wifi AP


1. Packet lost rate


3


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Experimental setup

Testbed:

1. WIFI(802.11g): ConnectBlue cB-OWSPA 311

2. Bluetooth(Class 1): ConnectBlue cB-OEMSPA331

3. BlueTooth(Class 2): ConnectBlue cB-OEMSPA311

4. ZigBee(802.15.4): ConnectBlue cB-OZS331

Measurement:

1. PRR


3. Power Consumption (Current)

Scenarios Jolly Hall (Indoor)

Danforth Campus (Outdoor)

4


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Scenario 1: line of sight

Campus Wifi: Channel 6;

Testing Wifi: Channel 11; Testing Zigbee: Channel 25

5

Sender Receiver


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PRR (%) v.s. Distance (m)

100 100 100

96.8

100 100 100 100100 100 100 100100 100 100 100

95

96

97

98

99

100

101

12 24 36 48

WifiBluetooth C1

Bluetooth C2

Zigbee

6


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Scenario 2: Drywall

7

Sender Receiver


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PRR (%) v.s. No. of drywalls

100 100 98

87

100 100 100 100100 100 100

0

100 100 100 100

0

20

40

60

80

100

120

1 2 3 4

PRR

No. of drywalls

WifiBluetooth C1

Bluetooth C2

Zigbee

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Scenario3: Different floors

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Sender Receiver


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PRR (%) v.s. No. of floors

100

90

0

100 100

0

100 100

0

100 100

00

20

40

60

80

100

120

1 2 3

PRR

No. of floors

wifiBluetooth C1

Bluetooth C2

Zigbee

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Scenario 4: Outdoor

11


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Max Communication Range

70

67

82

90

0 20 40 60 80 100

Wifi

Zigbee

Bluetooth Class2

Bluetooth Class1

Communication range (m)

12


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Current

171

52

34

35

173

53

35

37

175

54

40

43

0 50 100 150 200

Wifi

Zigbee

Bluetooth C2

Bluetooth C1

Current (mA)

Max

Min

Base

13


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Scenario 5: Interference under Wifi

Campus Wifi: Channel 6

Testing Wifi: Channel 6

Testing Zigbee: Ch. 17

(Coincide with Wifi Ch.

6)

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Sender Receiver WUFI AP


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PRR (%) v.s. Interference

95%

100%

100%

100%

56%

42%

100%

100%

0% 20% 40% 60% 80% 100% 120%

Wifi

Zigbee

Bluetooth2

Bluetooth1

Video streaming

No Wifi Traffic

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Comparison

16

0

0.5

1

1.5

2

2.5

3

3.5

4

PRRMax Comm

Range Power

Consumption

Bluetooth C1

Bluetooth C2

Zigbee

Wifi


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Outline


classes)

1. Packet reception rate


3. PRR under interference of Wifi AP


1. Packet lost rate (PLR)

PLR=1-PRR


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Experiment setup

Testbed:

1. Tmote sky motes

2. One Mac book pro and one Dell Latitude D630

Scenarios:

1. A two bedroom apartment

2. Jolly Hall

Measurement:

1. Packet lost rate

2. Received Signal Strength Index (RSSI)

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Scenario: Multiple Zigbee Sender

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Bluetooth Master

Bluetooth Slave

Zigbee Sender

Zigbee Receiver


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PLR v.s. Location of Zigbee Sender

0.0%

5.0%

10.0%

15.0%

20.0%

25.0%

P

LR

No Interference

Under Bluetooth

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Scenario: Multiple Bluetooth Pairs

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Bluetooth Master

Bluetooth Slave

Zigbee Sender

Zigbee Receiver


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PLR v.s. Location of Bluetooth Pair

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0.0%

2.0%

4.0%

6.0%

8.0%

10.0%

12.0%

14.0%

16.0%

18.0%

Bedroom1 Living Room Bedroom2 Kitchen None

PLR


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Scenario: Jolly Hall 5th Floor

24

1

Bluetooth pair Zigbee Receiver Zigbee Sender

2345


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PLR v.s. Distance

0.0%0.5%

1.0%

1.5%

2.0%

2.5%

3.0%

3.5%

4.0%

4.5%

5.0%

1 2 3 4 5

PLR

Position of Zigbee Sender

No Interference

Under Bluetooth

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Why Bluetooth could degrade


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Why Bluetooth could degradeZigbees Performance

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Test parameter

Motes channel: 25 (2475 MHz)

Motes packet rate:

Sends a packet when receives a senddone

Disable CSMA

Bluetooths data rate: around 70 kB/s

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Test Scenario

2929

Bluetooth Receiver

Bluetooth Sender

WispySpectrum Analyzer

Tmote Jammer


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Adaptive Frequency Hopping

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480s 230s190sG1: 10s

Bluetooth

802.15.4

BackgroundNoise


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Cost v.s. Gain

0

50

100

150

200

250

300

350

Test1 Test2 Test3 Test4

Second

s

Cost (s)

Gain (s)

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Questions?

33

interference automation jan28

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