1 / 31

Presented by Selim Dursun

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

eliana-pickett
Download Presentation

Presented by Selim Dursun

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Presented by Selim Dursun

  2. Bluetooth • What is bluetooth? • Introduction • Overview • Specifications & Layers • Profiles • Ad-hocnetworking • Qualification • Products & Future Usage

  3. 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.

  4. Intoduction • 1994Ericsson getsinterested in wirelessconnectionsfrommobiletelephonesto other deviceslikePDAsand accessorieslikeHeadsets • FormingtheSIG(SpecialInterestGroup)with4othermembers(IBM,Intel,Nokia,Toshiba)in orderto developawirelessstandard for communicationbetweenmobiledevices

  5. Introdution • Todayover 2000members • 2main priorities: • Cheap • Lower energyconsumption • IEEE802.15committeestandardizesthephysicaland linklayer • SIGstillenhancesBluetooth • two versionsin futurepossible (SIGvsIEEE)

  6. 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

  7. 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)

  8. Specifications & Layers • specification protocol stack

  9. Layers • Bluetooth Radio • Baseband • LMP(LinkManagerProtocol) • HCI(HostControllerInterface) • L2CAP(LogicalLinkControl andAdaptation Protocol) • RFCOMM(RadioFrequency Communication) • SDP(Service DiscoveryProtocol)

  10. Bluetooth Radio • the lowest defined layer of the Bluetooth specification • operating inthe 2,4GHzISMBand • accomplishesspectrumspreading byfrequency hopping(FHSS)from2.402GHzto2.480GHz

  11. 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

  12. 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

  13. 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

  14. 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

  15. Audio • two codecs:PCMandCVSD • both at64kbit/s • synchronousconnection oriented(SCO)links • time-critical • no retransmission • errorsappearasbackgroundnoise

  16. LMP (LinkManagerProtocol) • providesauthentication,linksetupandlinkconfiguration including powersurveillance • takesplace asaservice provider • communication with LMPDUs(protocol dataunits)

  17. HCI (HostControllerInterface) • providesacommandinterface to baseband controllerandlinkmanager • also to hardware status,control andeventregister • Bluetooth definedHostControllerTransportLayers: • UART (HCIoverserialinterface) • RS232(HCIoverserialinterface) • USB(HCIoverUSBinterface e.g.USBdongle)

  18. 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)

  19. 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

  20. 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

  21. SDP (Service DiscoveryProtocol)

  22. Profiles • how bluetooth isused • describe howimplementationsforaspecificuse mustbe written • definesoptionsineach protocol • definesparameterranges • profilesare usedto solve interoperabilityproblemsbetween differentmanufacturers’ products

  23. Profiles

  24. 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

  25. Ad-hoc-networking • a: piconet with a single slave • b: piconet with a multi slave • c: scatternet

  26. Qualification • aimsinteroperabilitybetween all bletooth devices • no licensefees • bluetoothdevicesmustsupportsameprofiles • bluetoothlogo guaranteesinteroperability

  27. Qualification • no line ofsight required • you can use it everywhere • bluetoothchip • integrated • powermanagement • not reallycheap • Automaticad-hocnetworking(invisible) e.g.automaticdata synchronisation

  28. 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

  29. 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

  30. 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

  31. Thats All ! Thanks for listening...

More Related