bluetooth based smart sensor networks
TRANSCRIPT
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Bluetooth Based Smart Sensor
Networks
By-Kokate Shantaram
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Bluetooth is wireless high speed data transfer technology over a short range (10 - 100 meters).
Bluetooth Wireless Technology (BWT) was developed in 1994 at Ericsson in Sweden.
Purpose – Originally it was build to eliminate the need for cable connections.
Introduction
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Ericsson on advent of BWT conceptualized a Radio Technology through a wireless personal area network (WPAN).
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Bluetooth Specifications are: Developed by: Jaap Haarsten in Sweden 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
BLUETOOTH SPECIFICATIONS
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Depending on the type of connections established between various Bluetooth devices, 2 main topologies are as:
1. PICONET TOPOLOGY, and 2. SCATTERNET TOPOLOGY
To any topology, there are 2 prime components:
1.MASTER device2. SLAVE device
BLUETOOTH TOPOLOGY
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In bluetooth, a Piconet is a collection of up to 8 devices that frequency hop together.
Primary Devices: Those devices which sets the frequency hopping pattern.
Secondary Devices: Those devices which get synchronized.
1. PICONET TOPOLOGY
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Master’s Bluetooth address is used for defining frequency-hopping sequence.
Slave devices use master clock to synchronize their clocks so as to hop simultaneously.
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use paging procedure to establish connection.
Blue tooth defines three low power modes sniff, hold and park.
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Scatternet consists of several Piconets connected by devices participating in multiple Piconet
2. SCATTERNET TOPOLOGY
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Advantages of Scatternet:• Higher throughput• Multi-hop connections between devices in different piconets.
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BWT uses 3 security mechanisms: authentication,authorization and encryption
3 levels (modes) security are:◦ MODE 1: No Security;◦ MODE 2: Service Level Security;◦ MODE 3: Link Level Security;
BWT SECURITY
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One such application is : WIRELESS SENSOR NETWORKS (WSN)
Important features of WSN: Collaboration of network nodes during Execution &
Data Centric nature
Many smart sensor nodes scattered in the field collect data and send it to users via ‘gateway’ using multi-hop routes
BLUETOOH BASED SENSOR NETWORKS
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WSN consists of number of small devices equipped with a sensing unit, microprocessors, wireless communication interface,power source.
Two main operations performed by WSN are 1. QUERING-(current value of the observation) 2. TASKING-(phenomenon has to be observed)
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MERITS of Bluetooth based Smart Sensor Networks:• Low Cost• Low Power Consumption• Short Range• Wireless Technology• Reasonable throughput• Low maintenance cost• Easy link establishmentDEMERITS of Bluetooth based Smart Sensor Networks:• Short Range (10 – 100 m)• Average Speed• Short Life
MERITS and DEMERITS
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THANK YOU
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