BLUETOOTH

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					PAPER PRESENTATION ON BLUETOOTH

BLUETOOTH OVERVIEW
1.INTRODUCTION 2.ORIGIN 3.BLUETOOTH SIG 4.AIMS

INTRODUCTION

BLUETOOTH’S ORIGIN
• VERSION 1.0 SPECIFICATION OF BLUETOOTH CAME IN 1999. • BUT BLUETOOTH STARTED IN 1994 BY ERICSSION MOBILE COMM. • NAMED AFTER HARALD BLATLAND(BLATAND IS DANISH FOR BLUETOOTH).

THE BLUETOOTH SIG
• BLUETOOTH SIG WAS FOUNDED IN FEB.1998 BY FOLLOWING CORE PROMOTORS • ERICSON MOBILE COMMUNICATIONS . • INTEL CORP. • IBM CORP. • TOSHIBA CORP. • NOKIA MOBILE PHONES.

AIMS OF SIG
• • • • • • EASY AND CONVENIENT RELIABLE RESILIENT WIDELY AVAILABLE INEXPENSIVE LOW POWER

specification

Technical overview

Core architecture of bluetooth

PROTOCOL STACK

PHYSICAL LAYER
• 1.FREQUENCY OF OPERATION(2.4GHZ) • 2.GLOBALLY AVAILABLE ISM BAND • 3.DIV.OF OP.BAND. IN 1MHZ-SPACED CHANNELS. • 4.EACH DIVISION’S SPEED IS 1MEGASYMBOL/S.USE OF MAXIMUM CHANNEL BANDWIDTH. • 5.MODULATION SCHEME(GFSK) • 6.FHSS • 7.POWER CLASSES

MASTER,SLAVES,SLOTS,FH
• TWO MODES OF OPERATION. • MASTER OR SLAVE. • MASTER SETS THE FREQ.HOPING SEQ. • SLAVES SYNCHRONISE TO THE MASTER IN TIME AND FREQ. • MASTER ALSO CONTROLS WHEN DEVICES ARE ALLOWED TO COMMUNICATE. • IT ALSO FIXES TIME SLOTS FOR DATA AND VOICE TRAFFIC. • IT ALSO DIVIDES BANDWIDTH AMONG SLAVES DEPENDING ON SITUATION WITH THE HELP TDM.

addressing

Radio power classes and links

connections

Piconet channel

Radio power class
• The bluetooth specification allows for three different types of radio powers. • Class1=100mW(20 dbm). • Class2=2.5mW(4 dbm). • Class3=1mW(0 dbm).

Voice and data links
• Bluetooth allows time critical data communication for voice or audio,as well as high speed,time insensitive packet data commu. • Two types of links. • SCO and ACL. • ACL data packets are constructed from 72-bit access code,a 54-bit packet header code and a 16-bit CRC code,in addition to payload data.

Link types

Packet types

There are variety of packet types for sending different amount of data.largest data Payload is a DH5 packet.it streches over 5 slots.can carry 339 bytes or 2,712 bits Of data.data rate in one dir. Is 723.2 kb/s.

Multi slot packets

security
• High speed,pseudo-random freq.hopping algorithm used. • For link encryption and authentication,it uses cipher algo.called safer+.

application
• • • • • Mobile cellular phone to PSTN. Mobile cellular phone to notebook PC. Mobile cellular phone to a headset. Lan access points for laptops or palmtops. Notebook,palmtop,or other internet access device to the internet via a PSTN access point or acces module. • Communication between laptop and palmtop.

Using bluetooth
• Discovering Bluetooth devices
User opens application

1st

bluetooth device

Repeated inquiry… 2nd bluetooth device

FHS

Connecting to service discovery database
• Baseband paging procedures set up ACL link.
Setup L2cap connection
Setup SDP connection

1st

bluetooth device

Service search attribute req.4 dun
Return attributes of DUN disconnect

2nd bluetooth device

Connecting to a bluetooth service
• Baseband paging setup ACL link.
LMP configuration proc.

Setup L2cap connection 1st bluetooth device 2nd bluetooth device

Setup RFcomm connection

LMP security procedures SETup DUN connection

THE FUTURE
• Correction and clarification of the latest version’s specification. • Development of further profiles. • Evolution of core specification for enhanced performance. • Increasing data rate. • Low power consumption • Link handover. • Quality of service.

advantages
• • • • • • • Low cost Low power Wireless Portability Security Omni-directional High penetration

Value propostion

disvantages
• Low range • Slow data rate

RADIO

baseband

LINK MANAGER

L2CAP MANAGER

VVI POINT

WHAT TO DO?

SEGMENTATION &REASSEMBLY

L2CAP CHANNELS

L2CAP:SUMMARY

SDP

SDP USAGE

RFCOMM

conclusion
• It can be safely concluded that • Bluetooth is and going to be very high volume system and yet demand very low cost with high levels of optimisation being very crucial.

Bibliography
• Bluetooth 1.1 by Jenifer Bray and Charles F sturman. • Embedded system design by RAJKAMAL. • Supported link • (www.bluetooth.com)


				
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posted:7/29/2009
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Description: ABOUT BLUETOOTH