2. WHAT IS BLUETOOTH?
Bluetooth is an open wireless protocol for
exchanging data over short distance using short
length radio waves from fixed and mobile devices
creating a personal area network. It can connect
several devices overcoming problems of
synchronization.
It is high speed ,low power microwave wireless link
technology.
3. WHY THIS NAME?
Danish Harald Blåtand was the King of Denmark
between 940 and 985 AD.
He united Denmark and Norway, so same way
Bluetooth of today will unite the worlds of
computers and telecom.
4. IMPLEMENTATION
Bluetooth uses a radio technology called frequency
hopping spread spectrum, which chops up data
being sent and transmits it.
It operates at 2.4 Ghz and is capable of transmitting
voice and data.
The effective range of bluetooth device is 32
feet(10 mts).
It transfers at the rate of 1 Mbps which is 3 to 8
times the avg speed of parallel and serial ports.
It is also known as IEEE 802.15 standards.
5. FREQUENCY HOPPING SPREAD
SPECTRUM
In this modulation
technique frequencies
are switched
repeatedly during radio
transmission.
It reduces interference
with other devices
1600 hops/sec- time
slot is defined as 625
microseconds
Pseudorandom
hopping
6. Bluetooth is a packet based protocol with master
slave structure
One master may communicate with upto 7 slaves in
a piconet
All devices share the masters clock
The master clock ticks at312.5micro sec intervals
Two clock ticks make up a slot of 625 micro sec
7. CNTD.
The master transmits in even slots and receives in
odd slots
Where as the slave receives in even slots and
transmits in odd slots
Packets may be 1,3 or 5 slots long
8. CLASSIFICATION
Classification of devices on the basis of Power
dissipated & corresponding maximum Range.
Class Max Power Range
permitted( (dbm) (approx)
mw)
Class 1 100 20 ~100mts
Class 2 2.5 4 ~10mts
Class 3 1 0 ~1mt
9. TECHNICAL FEATURES
Spread Spectrum (Frequency Hopping) &
Connection Type
Time Division Duplex (1600 hops/sec)
2.4 GHz ISM Open Band (79 MHz of
Spectrum
spectrum = 79 channels)
Modulation Gaussian Frequency Shift Keying
Transmission Power 1 mw – 100 mw
Data Rate 1 Mbps
Range 30 ft
Supported Stations 8 devices
Data Security –Authentication Key 128 bit key
Data Security –Encryption Key 8-128 bits (configurable)
Module size 9 x 9 mm
10. TYPICAL BLUETOOTH SCENARIO
• Bluetooth will support wireless point-to-point and
point-to-multipoint (broadcast) between devices in
a piconet.
• Point to Point Link m s
— Master - slave relationship
— Bluetooth devices can function as masters or
slaves
• Piconet
— It is the network formed by a Master and one or m
more slaves (max 7)
— Each piconet is defined by a different hopping
channel to which users synchronize to s s s
— Each piconet has max capacity (1 Mbps)
11. AD-HOC NETWORK
• Inter-piconet
communication
• Up to 10 piconets in a
scatternet
• Multiple piconets can
operate within same
physical space
• This is an ad-hoc, peer
to peer (P2P) network
13. CHANNEL ESTABLISHMENT
• There are two managed
situations
— A device knows the
parameters of the other
– It follows paging process
— No knowledge about the
other
– Then it follows inquiring &
paging process
• Two main states and sub-states
— Standby (no interaction)
— Connection (working)
— Seven more sub-states for
attaching slaves &
connection establishment
15. USES
Bluetooth is a standard communication protocol
primarily designed for low power consumption
Short range wireless solutions
World wide usability
Transfer of data as well as voice
Wireless networking between PCs in a confined
space and where little bandwidth is require
19. SUMMARY
• A new global standard for data and voice
• Eliminate Cables
• Low Power, Low range, Low Cost network devices
• Future Improvements
— Master-Slave relationship can be adjusted
dynamically for optimal resource allocation and
utilization.
— Adaptive, closed loop transmit power control can be
implemented to further reduce unnecessary power
usage.
