its useful for under standing bluetooth to use in sensor network with issues.

1. Bluetooth Based Smart
Sensor Network
Presented by,
Maulik Patel
131060753011(WiMC)

2. What Is Wireless Sensor Network ?

Networks of small devices equipped with sensors, microprocessor and wireless
Communication interfaces and power sources.

It can be deployed in an ad-hoc manner.

Automatically collected and presented in structured way using xml.

No limits in sensor type and number of sensor.

Various simple RF, Bluetooth, UWB or infrared might be used for
communication between sensors.

3. Operation Performed by WSN

QUERING – Queries are used when user requires only the current value of the
observation.

TASKING – More Complex operation Used when a phenomenon has to be
observed over a large period of time.

4. Application

Military applications

Monitoring friendly forces, equipment and ammunition

Nuclear, biological and chemical attack detection

Environmental applications

Forest fire detection

Flood detection and Precision agriculture

Health applications

Tracking and monitoring patients and doctors inside a hospital

Drug administration in hospitals
And much more…

5. Why to use Bluetooth in WSN?

Bluetooth is already well developed and experienced

Large range of Bluetooth devices available today.

Relatively low cost.

Many protocols are already developed.

Automatic node discovery synchronization and connection set up.

6. Bluetooth Specification

Standard: IEEE 802.15

ISM Band Frequency: 2.4 GHz

Range: 10 – 100 meters

Channel Bandwidth: 1 Mbps

Maximum Asymmetric Data Transfer Rate: 721 Kbps

Power saving mode(sniff , park and stand by)

piconet & scatternet

7. Smart Sensor Networks

Challenge : It is to ensure interoperability among various Bluetooth
manufactures’ devices and to provide numerous applications.

Important features of WSN: Collaboration of network nodes during
execution and Data Centric nature.

Many smart sensor nodes scattered in the field collect data and send it to
users via ‘gateway’ using multi-hop routes.

8. Smart Sensor Network (cont.)
Function of gateway :
 Communication with sensor networks: Shortage Wireless
Communication ; Discovery of smart sensor nodes
 Gateway Logic: Controlling Gateway interface and data
flow; Providing uniform access to sensors
 Communication with users: Communication over Internet,
WAN, Satellite, etc.

9. Sensor Network Implementation

Main goal is to develop hardware and software for test based for researcher.

automatically collected and presented in a structured way using XML.

new protocols can be added easily without affecting current functionality.

10. Smart sensor node implementation
For implementation of Sensor as Bluetooth Node, following components are
important:

Bluetooth Device

Sensors

Microcontroller
Its provide the

Sensing

Dataprocessing

Communication

11. Sensor network gateway implementation

Gateway is implemented in Pentium laptop with linux OS.

Complete software functionality developed in java so it is possioble to
change in operation system.

It can be implemented by the use of either bluetooth ,PCMCIA CARD.

Java community undertook the first effort towards bluetooth stack API
application

Ex-JSR-82 JABWT

12. Bluetooth Hardware Architecture

13. Bluetooth hardware architecture (contd.)
Bluetooth Hardware consists of 3 main functional modules:
 2.4 GHz Bluetooth RF Transceiver Unit
 Link Management Unit
 Host Controller Interface
HOST CONTROLLER– Consists of a Digital Signal Processing part,having Link
Controller(LC) & CPU Core. It interfaces to the Host environment.
LINK CONTROLLER - Consists of Hardware & Software parts to perform Base-Band
Processing, and PhysicalLayer Protocols.Also performs low-level digital signal
processing to form connections.

14. Discovery Of Smart Sensor Nodes

After installation, the primary step during execution is
to discover the smart sensor nodes in the area.

The is to prepare a list of sensor’s characteristics and
network topology.

Next in execution process, provision is to have addition
of new or removal of existing sensors.

15. Communication with smart sensor nodes

Initialization of gateway and Bluetooth Inquiry Procedure.

Discovery of Bluetooth device and Checking of major and
minor devices.

Setting of parameters and assigning type of devices and
sensors.

Description by Service-Class Field.

Discarding of non-smart nodes.

Exchange the service profile of each other.

Lastly, Bluetooth link is established and data exchange with
smart node starts.

16. Abstraction layers

Gateway’s abstraction layer uses sensor profiles to
create list of objects that represent each sensor in the
network.

Each object provides methods that enable sending and
receiving data to and from sensor. Specifics of actual
data transmission are hidden from users.

17. Research Issues

There are mainly two research issues for bluetooth based
smart sensor network:-
1.
Hardware development issues,
2.
Software development issues.
Some other functionality to developed
1.
Compression
2.
Aggregation
3.
Power mode related issues

18. Conclusion

Interesting research area with many possible solution

They are based on many collaborative effort of small devices

Many open issue related to physical layer , MAC layer , routing layer and
application layer

19. References

Bluetooth Based Wireless Sensor Networks –Implementation Issues and
Solutions -Srdjan Krco - Applied Research Lab, Ericsson Ireland

I.F. Akyildiz, W. Su, Y. Sankarasubramaniam, E.Cayirci, “Wireless sensor
networks: a survey”,Computer Networks 38, Elsevier, 2002

C. Shen, C. Srisathapornphat, C. Jaikeeo, “Sensorinformation networking
architecture and applications”,IEEE Personal Communications, August 2001

K. Sohrabi, J. Gao, V. Ailawadhi, G.J. Pottie, “Protocols for self-organization
of a wireless sensor network”,IEEE Personal Communications, October 2000