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The Bluetooth TM wireless technology

The Bluetooth TM wireless technology. A brief overview. Agenda for this presentation. The Bluetooth TM wireless technology The obligatory question.. What is Bluetooth? What is Bluetooth good for? Inside Bluetooth – How does it work? The protocol stack Bluetooth specific protocols

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The Bluetooth TM wireless technology

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  1. The BluetoothTM wireless technology A brief overview Seminar in Telecommunications, M. Hayoz

  2. Agenda for this presentation • The BluetoothTM wireless technology • The obligatory question.. • What is Bluetooth? • What is Bluetooth good for? • Inside Bluetooth – How does it work? • The protocol stack • Bluetooth specific protocols • L2CAP, Link Manager & the Baseband • Network creation: • Inquiry & Paging • About Piconets and Scatternets Seminar in Telecommunications, M. Hayoz

  3. Ericsson, the principal inventor, borrowed the name from Harald Bluetooth (son of Gorm) The King of Denmark circa 900AD United Denmark and Norway Seemed like a good name for uniting many dissimilar devices from different manufacturers The obligatory Bluetooth question:Where does the name come from? Seminar in Telecommunications, M. Hayoz

  4. What is Bluetooth? A new wireless technology specifically for: • Short range • Up to 10 meters typically • Modest performance (721Kbps) • Dynamic configurability • i.e. ad hoc networking/roaming • Low power • Well suited to handheld applications • Support for both voice and data Seminar in Telecommunications, M. Hayoz

  5. What is Bluetooth good for? • No wires! • In the home • On the move • Personal Area Networking (PAN) • Enabling a collection of YOUR personal devices to cooperatively work together • Locality sensitive services (i.e. roaming) • Visibility and access to additional resources, but only when they are within range and useful to you Seminar in Telecommunications, M. Hayoz

  6. Inside Bluetooth – The protocol stack Host Application API and Legacy Support Modules Bluetooth HCI Driver Physical I/F Physical I/F HCI Firmware Logical Link Control & Data Adaptation Physical Link Control Data Processing & Transmission Mgmt. Transmission/Reception Application RFCOMM SDP Audio (SCO) Control Host Data (ACL) Transport Interface Transport Bus Host Controller Interface Data (ACL) Bluetooth Module Audio (SCO) Control L2CAP Link Manager Baseband RF (radio and antenna) Seminar in Telecommunications, M. Hayoz

  7. L2CAP L2CAPLogical Link Control and Adaptation Protocol • Manages the creation and termination of virtual connections called Channels with other devices • Negotiates and/or dictates parameters • Including Security and Quality of Service (QoS) etc. • Manages data flow between the host and Link Manager • Multiplexing of multiple concurrent host I/O operations • Segmentation And Reassembly (SAR) of various data formats between the host and Bluetooth Seminar in Telecommunications, M. Hayoz

  8. Link Manager Link Manager • Physically manages creation, configuration, and termination of device to device links • Also manages the data flow between the L2CAP and Baseband through established channel • Forwards data from the L2CAP to the Baseband with its associated link specific transmission parameters • Forwards data from the Baseband back to the L2CAP associated to its specific source channel Seminar in Telecommunications, M. Hayoz

  9. Baseband Baseband • Performs all digital data processing operations • Speech coding • Data whitening • Optional encryption/decryption • Packetization • Header and payload error detection and correction • Manages and controls the radio interface Seminar in Telecommunications, M. Hayoz

  10. How does Bluetooth work? Operational States Master Active Slave Parked Slave* Standby* D F N M P O * Low power state J Q I C Seminar in Telecommunications, M. Hayoz

  11. In the beginning.. • Initially Bluetooth devices only know about themselves • Everyone passively monitors in Standby mode • No devices are synchronized D F N H G M A P B O E K J L Q I C Seminar in Telecommunications, M. Hayoz

  12. Note that a device can be “Undiscoverable” H InquiryDiscovering who’s out there • Inquiry discovers what other devices are within range D F N H G M A P B O E K J L Q I C 10 meters Seminar in Telecommunications, M. Hayoz

  13. B PagingCreating a Piconet • Paging creates a Master/Slave link called a Piconet D F N H G M A A P B O E K J L Q I C 10 meters Seminar in Telecommunications, M. Hayoz

  14. F G B E K J I Expanding a Piconet (1) • Successive Pages can attach up to 7 Active Slaves to a Piconet at one time D F N H M G A P O E K J L Q I C 10 meters Seminar in Telecommunications, M. Hayoz

  15. B B J J Parking • To save power and/or to connect to even more devices Active Slaves can be Parked (up to 256 total!) D F N H G M A P O E K L I Q C 10 meters Seminar in Telecommunications, M. Hayoz

  16. H C Expanding a Piconet (2) • Masters can then attach additional Active Slaves using Active Member Addresses freed up through Parking D F N H G M A P B O E K J L I Q C 10 meters Seminar in Telecommunications, M. Hayoz

  17. Advanced Scatternets • Scatternets can evolve into extremely complex structures creating a rich fabric of many, many, devices D F N H G M A P B O E K L J Q I C Seminar in Telecommunications, M. Hayoz

  18. Conclusional part Any questions..? Seminar in Telecommunications, M. Hayoz

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