Bluetooth technology by polite group

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Bluetooth in wireless Communication

Bluetooth in wireless Communication

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Group#4Group Members

Polite Group

M.Aftab Mustafa

Junaid Arshad

Syed Mubashir Abid

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Polite Group

Contents

Overview1

Why Bluetooth2

Features3

Classes of bluetooth4

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Contents

Bluetooth topology1

Security of Bluetooth2

Bluetooth Protocol stack3

Application/Advantages/Disadvantages4

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Over View

IntroductionBluetooth is short range

wireless communication technology

Bluetooth SIG.

Over View

.HistoryThe Bluetooth name came

from Danish king Harald Blatand

This technology was born in 1994

First version was release in 1999

COMPANYLOGOIntroduction

Bluetooth is a short range low power wireless technology standard for exchanging data over short distances.

Bluetooth is a wireless technology for creating personal networks operating in the 2.4 GHz unlicensed band, with a range of 10 meters

Networks are usually formed ad-hoc from portable devices such as cellular phones, handhelds and laptops.

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COMPANYLOGOWhy Bluetooth

Cable replacement between devices Supported by major companies Open specification Capable handling of both voice and data

simultaneously Low power consumption and Slow

transmission rate Connection can be initiated without user

interaction Devices can be connected to a multiple

devices at the same time

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Technical Features

Connection Type Spread Spectrum and time division duplex

Frequency Band 2.4GHz

Data rate per channel 1 to 3 Mb/sec

Network Topology Star

Transmission Power 1mw-100mw

Range 30ft

Supporting Station 8 devices

Data security-Authentication Key

128 bit key

Data security-Encryption key

8-128bits

Module size 9x9 mm

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Features of Bluetooth

Broadcast channel Enable Bluetooth information points that will drive the adoption of Bluetooth

into the cell phones and enable advertising model based around user pulling information

Topology management Enable automatic configuration of points Automatic configuration of Bluetooth topology

Alternative MAC PHY For transporting Bluetooth profile data For sending lots of data at high speed

QOS Improvement

Transmission at higher quality Enable the use of alternative MAC and PHY’s for transporting Bluetooth

profile data

COMPANYLOGOClasses of Bluetooth

Bluetooth devices are classified in three different power classes as shown in the following table

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Class Maximum parameter power (mW)

Range(approximately)

Class1 100mW 100 meter

Class2 2.5mW 10 meter

Class3 1mW 1 meter

COMPANYLOGOApplication Areas

Data and Voice Access points Real time voice and data transmission Cable Replacement Eliminates need for numerous cable

attachment for connection Ad-Hoc Networking Device with Bluetooth radio can

establishment connection with another when in range

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Bluetooth Topology

Piconets A set of Bluetooth devices sharing a common channel is called a

piconets.

Scatternets Scatternets are two or more independent and non-synchronized

piconets that communicate with each other by making bridge node

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Bluetooth security

Safer Transmission of data in Bluetooth 2.0 and late version

1. Bluejacking Bluejacking is the sending of unsolicited messages over Bluetooth to

Bluetooth-enabled devices such as mobile phones

2. Bluesnarffing Bluesnarfing is the unauthorized access of information from a wireless

device through a Bluetooth connection, often between phones, desktops, laptops, and PDAs. This allows access to a calendar, contact list, emails and text messages, and on some phones users can copy pictures and private video

Bluetooth error correction scheme1. FEC(forward error correction) The sender encodes the data using an error-correcting code (ECC) prior to

transmission.

2. ARQ unnumbered scheme(Automatic repeat request)• Blocks of data are verified using the error detection code• Receiver requests for retransmission of erroneous data.

COMPANYLOGOFHSS

Frequency-hopping spread spectrum (FHSS) is a method of transmitting

radio signals by rapidly switching a carrier among many frequency channels,

using a pseudorandom sequence known to both transmitter and receiver. It is

utilized as a multiple access method in the frequency-hopping code

division multiple access (FH-CDMA) scheme

Bluetooth devices use a protocol called (FHHS) Frequency-Hopping Spread Spectrum .

Uses packet-switching to send data.

Bluetooth sends packets of data on a range of frequencies.

In each session one device is a master and the others are slaves. The master device tells the slaves at what frequency data will be

sent.

This technique allows devices to communicate with each other more securely.

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COMPANYLOGOBluetooth Protocol Stack

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COMPANYLOGOBluetooth Protocol Stack

RF Layer The Radio (layer) is the lowest defined layer of the Bluetooth specification. It defines the requirements of the Bluetooth transceiver device operating

in the 2.4GHz ISM band It uses a packet switching protocol

Baseband layer This layer defines the timing, framing, packets and flow control on the link. Link Manager Responsible for managing connection states(authentication & encryption),

enforcing fairness among slaves & power management Logical Link Layer Handles multiplexing, segmentation and reassembly of large packets and

device discovery.

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COMPANYLOGOBluetooth Protocol Stack

Logical link control and adaptation protocol  L2CAP is used within the Bluetooth protocol stack. It passes packets to

either the Host Controller Interface (HCI) or on a hostelss system, directly to the Link Manager/ACL link.

L2CAP's functions include: Multiplexing data between different higher layer protocols. Segmentation and reassembly of packets. Providing one-way transmission management of multicast data to a group

of other Bluetooth devices. Quality of service (QoS) management for higher layer protocols Service discovery protocol (SDP) Used to allow devices to discover what services each other support, and

what parameters to use to connect to them Telephony Control Protocol Specification  TCS defines the call control signaling that is used by Bluetooth devices

for the establishment of speech and data calls

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Diagram

DisadvantagesAdvantages

Health concernApplications

Bluetooth

COMPANYLOGOAdvantages

Eliminates wire

Facilitate data and voice communication

Offer formation of Ad-Hoc network

Standardized Protocols

Free of charge

Easy to use

Low power consume battery less

Bluetooth technology is inexpensive

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COMPANYLOGODisadvantages

Relatively short range

Less secure

Interference with other devices

Medicore data rates

Bluetooth internet connection gets slow sometimes

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COMPANYLOGOHealth Concern

The carrier wave use by Bluetooth transmitter is the same

frequency range of microwave oven

The transmitting power is far to weak to be noticeable for humans

The radiation output power is Bluetooth devices is low so it is

assumed that the potential for health risk are lower

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COMPANYLOGOApplication

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COMPANYLOGORefrences

http://www.slideshare.net/guest664c3f/bluetooth-presentation-2562337#btnNext

http://en.wikipedia.org/wiki/Bluetooth

Stalling,W(2007) Wireless Communication and Network 2nd Edition PP 463-509

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