Bluetooth by Pratusha

8/8/2019 Bluetooth by Pratusha

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PRESENTATION

ONBLUETOOTH BASED

SMART SENSOR

NETWORK

BY

PRATUSHA PRADAKSHINA0501212171

BRANCH: EN-TC



OVERVIEW

WIRELESS SENSOR NETWORK

o Features of WSN.

BLUETOOTH

o Concept of Piconet & Scatternet.o FHSS scheme in bluetooth.

SMART SENSOR NODE IMPLEMENTATION.

APPLICATIONS

BLUETOOTH RELATED ISSUES

PROPOSED SOLUTIONS

CONCLUSION



WHAT IS WIRELSS SENSOR

NETWORK? Comprises of a no. of

small devices equipped

with sensing unit,microprocessor,wireless communicationinterface and power source.

Deployed in ad-hocmanner.



Features Of WSNSelf organization

capability.

Collaboration of network nodes duringtask execution.

Data-centric nature.

Querying and Tasking



What is BLUETOOTH? It is wireless protocol utilizing short range

communication technology.

Facilitates data transmission from fixed and/or mobile devices creating personal area

network(PAN).

Low cost device with small power consumption

and reasonable throughput.

Suitable for small battery driven devices.



Concept Of PICONET &

SCATTERNETPICONET :

o It is a collection of upto 8

devices that frequencyhop together.

o Out of which one is themaster device and other

are slaves.o Slave devices use the

masters clock tosynchronize their clocks.



SCATTERNET

Consists of several

piconets connected by

devices participating inmultiple piconets.

These devices can be

slave in all piconets or

master in one and slave

in other piconets.



FREQUENCY HOPPING SPREAD

SPECTRUM Scheme In Bluetooth

FHSS is a method of transmitting radio signals byrapidly switching a carrier among many frequencychannels.

It uses a pseudorandom process known to bothtransmitter and receiver.

Master¶s bluetooth address is used for definitionof frequency hopping sequence in a piconet.

Bluetooth uses unlicensed 2.4 GHz ISM banddivided into 79 channels of 1MHz each.



FREQUENCY HOPPING SPREAD

SPECTRUM(Contd.)Blutooth hops 1600 times

per second.

It uses a form of TDMAcalled TDD-TDMA.

Basic radio transmission packet time slot is 625s

(i.e.1/1600s).Each radio packet consists

of local area piconet ID,device ID and logicalchannel identifier



BLUETOOTH ISSUES

Scalability Issues: Only 8 nodes can be connected ata time so dense n/w not possible.Slave to Slave directcommunication not possible.

Increased Delay In Connection: inquiry procedureto discover different bluetooth unit is lengthy.

Privacy Concerns: No information about source of n/w is provided by inquiry unit.

Establishing a scatternet is very difficult due tofrequency interference problem.

Low Throughput: It is 1mbps but withoverheads it is 722 kbps only.



PROPOSED SOLUTIONSWith bluetooth 2.0 throughput of 10mbps

possible.

Multiple piconets can coordinate to avoidfrequency interference

Master of one piconet can get the sequence of frequencies used by other piconets and can choose

a set of non-overlapping frequency for itself.Making the inquiry unit to send the source

information can solve privacy issues.



CONCLUSIONBluetooth is a possible choice for data

communication in sensor networks.

Low power, low cost, hardware availability are someof bluetooth advantages.

While slow connection, smaller range are some of itsdisadvantages.

As the saying ³SMALL IS BEAUTIFUL´ isgetting popular bluetooth is certainly going to emergeas best short range wireless technology.



REFERENCESo www.bluetooth.como invited paper by Srdjan Krco- Applied research lab,

Ericsson Ireland ,o 3.J.M. Rabaey, M.J. Ammer, J.L. da Silva Jr., D.

Patel, S. Roundy, ³ PicoRadio Supports Ad Hoc Ultra-Low Power

o Wireless Networking" , IEEE Computer Magazine,

July 2000

o "How Bluetooth TechnologyWorks".Bluetooth SIG. Retrieved on 2008-02-

01.



THANK YOU

Bluetooth by Pratusha

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