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ZigBee-based alarm system forpervasive healthcare in rural areas

Communications, IET Publication Date: February 2008 Volume 2Cassas,R Marco,A Plaza,I Garrido,Y Falco,J

StudentChen, Zong-Ren . , -

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Outline

Introduction

Descri tion of the Method

Mobile End-Device

ZigBee Characteristics

Network Architecture Systems flow diagram

Conclusions

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Abstract

in rural areas is presented

The alarm system take advantage of ZigBee

Smalllong battery life and large coverage region

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Introduction

What is their need

a s e pro em o s ay n e ome

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Descri tion of the Method

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The system what is enable to those in need to receive

Create a communication infrastructure( point-to-point link with

Telephone line and GSM modem have problem about costefficiency

Cell phone and PDAs to exchange data via bluetooth, but

bluetooth is more consuming

Using WiFi that is large for device

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Mobile End-Device 1/2

accelerometer

Active mode

Rest mode

Deep monitoring mode

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Mobile End-Device 2/2

mode for maximize the lifetime of the device

its parent

Polling the neighbor/relative takes 20ms

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Zi Bee Characteristics 1/3

,topologiesstarcluster tree and mesh

ZigBee devices will be more ecological than WiFi saving

WiFi RX power is 667 mW on 100 devices/home & 50000homes/city = 3.33 MW

ZigBee power is 30 mW on 100 devices/home & 50000

homes/city = 150kW

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Zi Bee Characteristics 2/3

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Extremely low cost and Ease of implementation

IEEE defines two type of devices

Full function device( FFD)

Able to be Network CoordinatorRouter and End device

Can talk with any other device

Only star topology

Only can be End device n y a w oor na or or ou er

Simple implementation

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Zi Bee Characteristics 3/3

Sleep mode change to active = 15ms typically

Active channel access time = 15ms typically

2+ years from normal batteries

Bluetooth

Sleep mode change to active = 3s typically Active channel access time = 2ms typically

ZigBee devices can quickly attach, exchange information,

detach, and then o to dee slee to achieve a lon batter life.

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Network Architecture 1/5

-

The nodes in the network have three different roles coordinator

Routers

MED

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Network Architecture 2/5

data and connect to a central computer

exchange data with the mobile devices

,

MEDs connected in star

MED carried b eo le transmit data and receive messa esfrom the coordinator

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Network Architecture 3/5

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Network Architecture 4/5

Directional antenna( 21*21 cm)

SMD antennas( 2*7 mm)

Directional antennas are used to cover cover straight streets orto reach sites located far from coordinator

SMD antennas are used in portable devices and routers

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Network Architecture 5/5

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S stems flow dia ram 1/2

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S stems flow dia ram 2/2

ALARM RAISEDCan handle the

alarm Wam Local ResponsibleNO

Addressed by ZigBeeNetwork to the Local

ALARM ATTENDEDLOCALLY

Connect to the RegionalManagement Centre over Serious alarm

Internet

Users Neighbor/RelativeSupporting List

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Ener consum tion 1/2

accelerometer data

That is a current consumption of 95.7A/s in active mode That is a current consumption of 22.7A/s in rest mode

When it polling the neighbor/relative

That is a current consumption of 70A/s in active mode

That is a current consumption of 70A/s in rest mode

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Ener consum tion 2/2

It will provide more than 8 months of continuous monitoring in

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Conclusions

,move freely in their habitual environment: home and

surroundings

The system has obvious benefits, but it can also invade theusers privacy

The use of ZigBee give the village with a wireless infrastructurethat enables the integration with many other systems that might

of the environment and remote medical monitoring

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References

,

Chen, J., Kwong, K., Chang, D., Luk, J., and Bajcsy, R.: Int. Conf. Engineering in Medicine and Biology Society, IEEE-EMBS 2005, September 2005, pp. 35513554

Lindemann, U., Hock, A., Stuber, M., Keck, W., and Becker, C.:Evaluation of a fall detector based on accelerometers: a pilot

, . . . . ., , , , .

Jovanov, E., Milenkovic, A., Otto, C., and de Groen, P.C.: A

wireless bod area network of intelli ent motion sensors forcomputer assisted physical rehabilitation, J. NeuroEng.Rehabil., 2005, 2, (6), available at:

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an s or your s en ng

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