DIUF, Seminar in Telecommunications, M. Hayoz The Bluetooth TM wireless technology A brief overview

DIUF, Seminar in Telecommunications, M. Hayoz 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 L2CAP, Link Manager & the Baseband Network creation: Inquiry & Paging About Piconets and Scatternets

DIUF, Seminar in Telecommunications, M. Hayoz The obligatory Bluetooth question: Where does the name come from? 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

DIUF, Seminar in Telecommunications, M. Hayoz 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

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

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

DIUF, Seminar in Telecommunications, M. Hayoz L2CAP Logical 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 L2CAP

DIUF, Seminar in Telecommunications, M. Hayoz 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 Link Manager

DIUF, Seminar in Telecommunications, M. Hayoz 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 Baseband

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

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

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

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

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

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

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

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

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