presented by selim dursun n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Presented by Selim Dursun PowerPoint Presentation
Download Presentation
Presented by Selim Dursun

Loading in 2 Seconds...

play fullscreen
1 / 31

Presented by Selim Dursun - PowerPoint PPT Presentation


  • 161 Views
  • Uploaded on

Presented by Selim Dursun. Bluetooth. What is bluetooth? Introduction Overview Specifications & Layers Profiles Ad-hoc networking Qualification Products & Future Usage. What is bluetooth?.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Presented by Selim Dursun' - eliana-pickett


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
bluetooth
Bluetooth
  • What is bluetooth?
  • Introduction
  • Overview
  • Specifications & Layers
  • Profiles
  • Ad-hocnetworking
  • Qualification
  • Products & Future Usage
what is bluetooth
What is bluetooth?
  • Bluetooth wireless technology is an open specification for a low-cost, low-power, short-range radio technology for ad-hoc wireless communication of voice and dataanywhere in the world.
intoduction
Intoduction
  • 1994Ericsson getsinterested in wirelessconnectionsfrommobiletelephonesto other deviceslikePDAsand accessorieslikeHeadsets
  • FormingtheSIG(SpecialInterestGroup)with4othermembers(IBM,Intel,Nokia,Toshiba)in orderto developawirelessstandard for communicationbetweenmobiledevices
introdution
Introdution
  • Todayover 2000members
  • 2main priorities:
    • Cheap
    • Lower energyconsumption
  • IEEE802.15committeestandardizesthephysicaland linklayer
  • SIGstillenhancesBluetooth
    • two versionsin futurepossible

(SIGvsIEEE)

overview
Overview
  • Originally conceived as a cable replacement technology
  • Other usage models begantodevelop:
    • Personal Area Network (PAN)
    • Ad-hoc networks
    • Data/voice access points
    • Wireless telematics
overview1
Overview
  • Advantages
    • Bluetooth: interoperable
    • IrDA:line ofsightneeded,point-to-point
    • WLAN:higher power consumption
  • Disadvantages
    • Bluetooth: onlyupto1Mbps
    • IrDA:muchcheaper,faster (upto16Mbps)
    • WLAN:faster (upto11Mbps)

WLANandBluetoothinterfere eachother(bothare usingthe ISMband)

specifications layers
Specifications & Layers
  • specification protocol stack
layers
Layers
  • Bluetooth Radio
  • Baseband
  • LMP(LinkManagerProtocol)
  • HCI(HostControllerInterface)
  • L2CAP(LogicalLinkControl andAdaptation Protocol)
  • RFCOMM(RadioFrequency Communication)
  • SDP(Service DiscoveryProtocol)
bluetooth radio
Bluetooth Radio
  • the lowest defined layer of the Bluetooth specification
  • operating inthe 2,4GHzISMBand
  • accomplishesspectrumspreading byfrequency hopping(FHSS)from2.402GHzto2.480GHz
bluetooth radio1
Bluetooth Radio
  • 3 different power classes
    • PowerClass1:long range (100m,100mW)
    • PowerClass2:midrange (10m,1-2,5mW)
    • PowerClass3:shortrange (0.1-10m,1mW)
  • signalstrength adjustment
baseband
Baseband
  • the physical layer of the Bluetooth that provides
    • Errorcorrection
    • Flowcontrol
    • Hopping sequence
    • Security
  • hopping through 79channels
  • dataisdividedinpackets
    • accesscode:e.g.timing synchronization
    • header:e.g.packetnumbering,flowcontrol,slave address
    • payload:voice,dataorboth
baseband1
Baseband
  • Connection Modes

describes the set of rules by which all bluetooth devices must abide in order to establish a link a communicate with one another

    • STANDBY: not connected in a piconet
    • ACTIVE:active participation on the channel
    • PowerSaving Modes
      • SNIFF:slave listensto the channel atareducedrate(decreasing ofdutycycle) leastpowerefficient
      • HOLD:datatransferisheldforaspecifictime period, mediumpowerefficient
      • PARK:synchronizedto the piconetbutdoesnotparticipate intraffic
baseband2
Baseband
  • SecurityModes
    • non-secure
    • encryption enforcedby application layer
    • encryption enforcedby linklayer
    • For devices
      • trusted device
      • untrusted device
    • For services
      • require authorization and authentication
      • require authentication
      • open to all devices
audio
Audio
  • two codecs:PCMandCVSD
  • both at64kbit/s
  • synchronousconnection oriented(SCO)links
  • time-critical
  • no retransmission
  • errorsappearasbackgroundnoise
lmp link manager protocol
LMP (LinkManagerProtocol)
  • providesauthentication,linksetupandlinkconfiguration including powersurveillance
  • takesplace asaservice provider
  • communication with LMPDUs(protocol dataunits)
hci host controller interface
HCI (HostControllerInterface)
  • providesacommandinterface to baseband controllerandlinkmanager
  • also to hardware status,control andeventregister
  • Bluetooth definedHostControllerTransportLayers:
    • UART (HCIoverserialinterface)
    • RS232(HCIoverserialinterface)
    • USB(HCIoverUSBinterface e.g.USBdongle)
l2cap logical link control and adaptation protocol
L2CAP (LogicalLinkControl andAdaptation Protocol)
  • providesaconnection-orientedandconnectionlessservice to upperlayer
  • protocolswith quality-of-service functionsusing multiplexing,segmentation andreassembly
  • two linktypesdefinedinBasebandlayer:
    • 1.SCO(synchronousconnection-oriented)
    • 2.ACL(asynchronousconnection-less)

BUT ONLYACLissupportedby L2CAP

(SCOnotplanned)

rfcomm radio frequency communication
RFCOMM (RadioFrequency Communication)
  • Providesemulation ofserialports
  • Supportsupto 60simultaneousconnections
  • Differentiatesbetween two device types:
    • Type 1:communication endpoints(e.g.printer or headsets)
    • Type 2:deviceswhich are partofcommunication(e.g.modems)
  • Butinthe protocol itselfno distinction ismade, some information isfortype 1otherfortype 2
sdp service discovery protocol
SDP (Service DiscoveryProtocol)
  • discoverswhichservicesare available
  • identifiesthe characteristicsofthe services
  • uses a request/response model where each transaction consists of one request protocol data unit (PDU) and one response PDU
  • SDPisusedwithL2CAP
  • isoptimizedforthedynamicnature of bluetooth
  • SDPdoesnot definemethodsforaccessingservices
profiles
Profiles
  • how bluetooth isused
  • describe howimplementationsforaspecificuse mustbe written
  • definesoptionsineach protocol
  • definesparameterranges
  • profilesare usedto solve interoperabilityproblemsbetween differentmanufacturers’ products
ad hoc networking
Ad-hoc-networking
  • piconet
    • decentral, onemasterupto7slaves
    • upto255parked slaves
    • point to point or point to multipoint conn
    • unique bluetoothdeviceaddress
  • scatternet
    • overlappingoftwopiconets, up to 10
    • differenthoppingsequences
    • peer to peer (P2P) network
ad hoc networking1
Ad-hoc-networking
  • a: piconet with a single slave
  • b: piconet with a multi slave
  • c: scatternet
qualification
Qualification
  • aimsinteroperabilitybetween all bletooth devices
  • no licensefees
  • bluetoothdevicesmustsupportsameprofiles
  • bluetoothlogo guaranteesinteroperability
qualification1
Qualification
  • no line ofsight required
  • you can use it everywhere
  • bluetoothchip
    • integrated
    • powermanagement
    • not reallycheap
  • Automaticad-hocnetworking(invisible)

e.g.automaticdata synchronisation

products
Notebook PCs & desktop computers

Printers

PDAs

Other handheld devices

Cell phones

Wireless periperals:

Headsets

Cameras

Access Points

CD Player

TV/VCR/DVD

Telephone Answering Devices

Cordless Phones

Cars

Products
products1
Products
  • 2004 Toyota Prius – hands free calls
  • Toshiba Washer & Dryer – downloads the washer/dryer software for new clothes!
  • Nokia N-gage
  • Digital Pulse Oximetry System
future usage
Future Usage
  • Home Automation
  • Home Entertainment/Games
  • Electronic Commerce/M-Commerce
  • Industrial Control
  • Surveillance
  • Access Control
  • Location Based Services
  • Current Trials: Shopping Malls, Train Stations
thats all

Thats All !

Thanks for listening...