Bluetooth Intro


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  • Bluetooth Intro

    1. 1. Introduction Bluetooth and Bluetooth logos are trademarks owned by Bluetooth SIG,Inc,, USA and used by MindTree Consulting Pvt. Ltd. under license. - Chandu
    2. 2. Session 1 - Agenda <ul><ul><li>Bluetooth Intro </li></ul></ul><ul><ul><li>Applications and Usage Scenarios </li></ul></ul><ul><ul><li>Comparison – WLAN, ZigBee </li></ul></ul><ul><ul><li>The Market and Main Players </li></ul></ul><ul><ul><li>Bluetooth Architecture </li></ul></ul><ul><ul><ul><li>Controller Layers </li></ul></ul></ul><ul><ul><ul><li>Host Layers </li></ul></ul></ul><ul><ul><li>Bluetooth Radio Basics </li></ul></ul><ul><ul><li>Concept of Frequency Hopping </li></ul></ul><ul><ul><ul><li>Bluetooth Topology </li></ul></ul></ul>
    3. 3. What is Bluetooth ? <ul><li>It is a cable-replacement technology </li></ul><ul><li>Named after a Danish Viking and King, Harald Blåtand (translated as Bluetooth in English) </li></ul><ul><li>Conceived initially by Ericsson </li></ul><ul><li>Low cost, low power, Short-range (10m-100m) </li></ul><ul><li>SIG Special Interest Group </li></ul>
    4. 4. What can I do with Bluetooth ? <ul><li>Eliminating the need for wired connections between electronic products and accessories </li></ul><ul><li>Exchanging files, business cards, calendar appointments, etc. with groups of Bluetooth users </li></ul><ul><li>Transferring and synchronizing files between devices </li></ul><ul><li>Connecting to localized content services in public areas </li></ul><ul><li>Functioning as remote controls, keys, tickets and e-cash wallets </li></ul>
    5. 5. Applications and Usage Scenarios <ul><li>Mobile Phones </li></ul><ul><ul><li>Headset </li></ul></ul><ul><ul><li>Handhelds </li></ul></ul><ul><ul><li>PC </li></ul></ul><ul><ul><li>Printer </li></ul></ul><ul><ul><li>Mobile Phones </li></ul></ul><ul><ul><li>Cameras </li></ul></ul><ul><ul><li>Automotive </li></ul></ul><ul><ul><li>GPS </li></ul></ul><ul><li>PCs </li></ul><ul><ul><li>Mobile Phones </li></ul></ul><ul><ul><li>Handhelds </li></ul></ul><ul><ul><li>PC’s </li></ul></ul><ul><ul><li>MP3 Players </li></ul></ul><ul><ul><li>Keyboard </li></ul></ul><ul><ul><li>Mice </li></ul></ul><ul><ul><li>Camera </li></ul></ul><ul><ul><li>Access Point </li></ul></ul>
    6. 6. Applications and Usage Scenarios <ul><li>Innovative Solutions </li></ul><ul><ul><li>MP3 Headsets </li></ul></ul><ul><ul><li>Gaming </li></ul></ul><ul><ul><li>Automotive Diagnostics </li></ul></ul><ul><ul><li>Barcode </li></ul></ul><ul><ul><li>Music System </li></ul></ul><ul><ul><li>Monitoring </li></ul></ul>
    7. 7. The Main Players - Truly integrated single-chip Bluetooth system. - CMOS technology. - Stack and Profiles - <ul><li>Single-chip radio processors, </li></ul><ul><li>stand-alone radio modems </li></ul><ul><li>- Ultimate Blue Series </li></ul>Single Chip solutions Strong in Cell phone Market BlueLink series <ul><li>- Single Chip solutions </li></ul><ul><li>Stack & Profiles (WIDCOMM) </li></ul><ul><li>- BlueTonium Series </li></ul>
    8. 8. Bluetooth journey <ul><li>V 1.1 </li></ul><ul><ul><li>From Feb 2001 </li></ul></ul><ul><ul><li>Low power modes </li></ul></ul><ul><ul><li>Isochronous connections </li></ul></ul><ul><li>V 1.2 </li></ul><ul><ul><li>Nov 2003 </li></ul></ul><ul><ul><li>Co-existance with other wireless applications </li></ul></ul><ul><ul><li>Improved support for isochronous connections </li></ul></ul><ul><ul><li>Faster connection </li></ul></ul>
    9. 9. Bluetooth journey (contd..) <ul><li>V 2.0 </li></ul><ul><ul><li>Nov 2004 </li></ul></ul><ul><ul><li>Higher speed </li></ul></ul><ul><ul><ul><li>723kbps to 723*3 kbps </li></ul></ul></ul><ul><li>V 2.1 </li></ul><ul><ul><li>July 2007 </li></ul></ul><ul><ul><li>Ultra low power consumption </li></ul></ul><ul><ul><li>Enhanced security </li></ul></ul><ul><ul><li>Faster user response </li></ul></ul>
    10. 10. Protocol Stack Bluetooth Controller Bluetooth Host
    11. 11. Protocol Stack <ul><li>Radio </li></ul><ul><ul><li>Transmit/receive packets on physical channel </li></ul></ul><ul><ul><li>Transforms streams of bits between physical channel & baseband. </li></ul></ul><ul><li>Baseband and Link Control </li></ul><ul><ul><li>The Baseband and Link Control layer enables the physical link between Bluetooth units forming a piconet </li></ul></ul><ul><ul><li>Bluetooth uses FHSS where packets are transmitted on defined frequencies in defined time slots </li></ul></ul><ul><ul><li>This layer uses inquiry and paging procedures to synchronize the transmission hopping frequency and clock of different Bluetooth devices. </li></ul></ul><ul><ul><li>Provides asynchronous and synchronous logical connections </li></ul></ul><ul><ul><li>Takes care of encoding / decoding , Encryption etc </li></ul></ul>
    12. 12. Protocol Stack <ul><li>Link Manager Protocol </li></ul><ul><ul><li>The link manager protocol is responsible for creation, modification and release of links between Bluetooth devices. </li></ul></ul><ul><ul><li>Authentication and encryption </li></ul></ul><ul><ul><li>Control and negotiation of Baseband packet </li></ul></ul><ul><ul><li>Controls the power modes and the connection states of a Bluetooth unit. </li></ul></ul><ul><li>Logical Link Control and Adaptation Protocol (L2CAP) </li></ul><ul><ul><li>The Bluetooth logical link control and adaptation protocol (L2CAP) adapts upper layer protocols over the Baseband. </li></ul></ul><ul><ul><li>L2CAP provides connection-oriented and connectionless data services to the upper layer protocols with protocol multiplexing capability. </li></ul></ul><ul><ul><li>Segmentation and reassembly operation. </li></ul></ul><ul><ul><li>Group abstractions. </li></ul></ul>
    13. 13. Protocol Stack <ul><li>Service Discovery Protocol (SDP) </li></ul><ul><ul><li>Provide the basis for all the usage models. Using SDP, device information, services and the characteristics of the services can be queried and after that, a connection between two or more Bluetooth devices can be established. </li></ul></ul><ul><li>RFCOMM </li></ul><ul><ul><li>RFCOMM is a serial line emulation protocol and is based on ETSI 07.10 specification. This “cable replacement” protocol emulates RS-232 control and data signals over Bluetooth. </li></ul></ul>
    14. 14. Bluetooth Radio Basics <ul><li>The Bluetooth radio accomplishes spectrum spreading by frequency hopping in 79 hops displaced by 1 MHz, starting at 2.402GHz and finishing at 2.480GHz. </li></ul><ul><li>Uses GFSK (Gaussian Frequency Shift Keying) Modulation </li></ul><ul><li>Uses PSK (Phase Shift Keying) Modulation for EDR </li></ul>BB Radio Digital IFC
    15. 15. Bluetooth Channel <ul><li>The channel is represented by a pseudo-random frequency hopping sequence & slot timing </li></ul><ul><li>The channel is divided into time slots where each slot corresponds to an RF hop frequency. Consecutive hops correspond to different RF hop frequencies. Each slot is 625 us in length. The time slots are numbered according to the Bluetooth clock of the piconet master. </li></ul><ul><li>A TDD scheme is used where master and slave alternatively transmit. The master shall start its transmission in even-numbered time slots only, and the slave shall start its transmission in odd-numbered time slots only. The packet start shall be aligned with the slot start </li></ul>
    16. 16. Bluetooth Topology PICONET Two or more Bluetooth devices using the same channel form a piconet . There is one master and one or more slave (s) in each piconet SCATTERNET If multiple piconets cover the same area, a device can participate in two or more overlaying piconets by applying time multiplexing.
    17. 17. Bluetooth Channel (Cont..)
    18. 18. Bluetooth Clock and Bluetooth Device Address LPO Worst Case accuracy +- 250ppm Standard Worst Case accuracy +- 20ppm Obtained from the IEEE Registration Authority.
    19. 19. Packet Format <ul><li>Standard basic rate packet format </li></ul>
    20. 20. Packet Format <ul><li>Standard Enhanced Data rate packet rate format </li></ul>
    21. 21. Imagination Action Joy