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Bluetooth

Joe Casey. Bluetooth. Use short-range wireless links between both mobile and stationary devices. Data and voice can be communicated seamlessly. Personal Area Network (PAN). Bluetooth Standard. Spread-spectrum First-generation can transfer data up to rate of 1 Mbps

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Bluetooth

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  1. Joe Casey Bluetooth

  2. Use short-range wireless links between both mobile and stationary devices. Data and voice can be communicated seamlessly. Personal Area Network (PAN) Bluetooth Standard

  3. Spread-spectrum • First-generation can transfer data up to rate of 1 Mbps • Version 2.0 can reach 3 Mbps. • Continuously variable slope delta modulation (CVSD) • Voice encoding; minimal disruption • Serially data in binary over radio frequency link Tech Overview

  4. Asynchronous connectionless link (ACL) • Best-effort traffic • Packet-switched • Point-to-multipoint Asynchronous Channels

  5. SCO link Sender and receiver clocks are in synch Circuit-switch Point-to-point connections Used for voice, data, and multimedia All SCO links are symmetrical, providing the same amount of bandwidth in both the sending and receiving directions. Synchronous Connection-Oriented

  6. Spread Spectrum • Time Division Duplexing (TDD) • Derivative of TDMA • Provides time slots for voice and data Modulation

  7. Bluetooth Core Protocols • Cable Replacement Protocol • Telephony Control Protocols • Telephony Control Specification Binary (TCS BIN) • AT-Commands • Adopted Protocols • PPP, UDP/TCP/IP, OBEX, WAP, vCard, vCalendar, IcMC, WAE Bluetooth Protocol Stack

  8. Baseband • Enables the physical RF link between Bluetooth units in a piconet • Link Management Protocol (LMP) • Logical Link Control and Adaptation Layer (L2CAP) • Service Discovery Protocol (SDP) Bluetooth Core Protocols

  9. Responsible for like setup and control between Bluetooth devices. • Baseband packet sizes • Authentication and encryption • Controls power modes, duty cycles, and connection states. Link Management Protocol (LMP)

  10. Logical Link Control and Adaptation Layer • Supports: • higher level protocol multiplexing • Packet segmentation • Quality of service L2CAP

  11. Radio Frequency Communication (RFCOMM) • Serial line emulation of RS-232 serial ports over L2CAP Cable Replacement Protocols

  12. Software runs on a microprocessor in each Bluetooth device. • Responsibilities: • Discovering other remote link managers. • Link setup • Authentication • Configuration Link Management

  13. The messages exchanged between Link Managers • 55 PDUs in Bluetooth specification • Uses 7-bit op code Packet Data Units (PDU)

  14. Morrow, Robert. Bluetooth: Operation and Use. McGraw-Hill Professional. 2002. Muller, Nathan J.. Bluetooth Demystified. McGraw-Hill Professional Book Group. 2000. Wikipedia.org. Bluetooth. December 1, 2009. http://en.wikipedia.org/wiki/Bluetooth. References

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