15. Bluetooth Protocols Application Framework and Support Link Manager and L2CAP Radio & Baseband Host Controller Interface RF Baseband Audio Link Manager L2CAP TCP/IP HID RFCOMM Applications Data Control
22. Different phases of Bluetooth Hands free kit connection Discovery Pairing Detection of Profiles Connection Data Synchronisation Hello, I am looking for bluetooth devices Hello, I am an available Bluetooth device
23. Different phases of Bluetooth Hands free kit connection Discovery Pairing Detection of Profiles Connection Data Synchronisation What is your authentification Code ? 1234… This code has to be typed on your keyboard Ok ! Now we are paired
24. Different phases of Bluetooth Hands free kit connection Discovery Pairing Detection of Profiles Connection Data Synchronisation What type of profile do you support ? I can do headset and hands-free . What about you ?
25. Different phases of Bluetooth Hands free kit connection Discovery Pairing Detection of Profiles Connection Data Synchronisation Ok, we are now connected in Hands-free. I can do hands-free.
26. Different phases of Bluetooth Hands free kit connection Discovery Pairing Detection of Profiles Connection Data Synchronization To complete my phonebook, I have to synchronise with your contacts Ok, I transfer my 163 contacts.
FHSS Chops up the data being sent and transmits chunks of it on up to 79 frequencies. 1600 hops/sec- time slot is defined as 625 microseconds Packet 1-5 time slots long FHSS is used to minimize the risk of such interference with systems operating on this Band such as microwave ovens, baby monitors and 802.11 wireless networks. GFSK When we jump from (1,-1 or -1,1), mod waveform changes rapidly, introducing large out of bound spectrum.(no overshoot to a step function input ) Uses Gaussian filter (uses G.Function) to limit its spectral width. GFSK = Baseband pulses(-1,1) gaussian filter FSK modulator FSK = Baseband pulses(-1,1) FSK modulator 1Mb/s with overhead, this effectively becomes 721 kbps. SIG 5 companies joined to form the Bluetooth Special Interest Group (SIG) in 1998. First specification released in July 1999
Most powerful devices Infrared IrDA (WPAN) : synchronization, link between a phone and a laptop… – Less flexible than Bluetooth, need of a line of site – Comparable data rate Wi-Fi (WLAN) : Wireless LAN access – Far higher bandwidth and data rate than Bluetooth – Higher power consumption than Bluetooth – Requires infrastructure investment
The slaves in a piconet can only have links to the master. Slaves cannot directly transmit data to one another
IBM Research P. Bhgwat
Devices that participate in two or more piconets may act as gateways, forwarding traffic from one piconet to another Bluetooth units can only transmit and receive data in one piconet at a time. As devices in mulltiple piconets divide their time between the piconets, spending some time slots in one and some time slots in another on TDM basis. Devices give notification of inactivation to master that it will be inactive for a predetermined length of time. The device will then have to re-synchronize its clock with its other master. When a slave becomes inactive in a piconet, communications between masters and the other active slaves go on as normal. On the other hand, when a master becomes inactive in its piconet, the slaves will have to wait for it to be active again before communication can resume.
The radio layer describes the physical characteristics a Bluetooth device’s receiver-transmitter component must have. These include modulation characteristics, radio frequency tolerance, and sensitivity level.
See ACL links
See ACL links OBEX The Object Exchange Protocol (OBEX) is a specification for object data exchange over infrared (IR) links. Examples for using OBEX include exchanging business cards and synchronizing calendar applications.
Infrared IrDA (WPAN) : synchronization, link between a phone and a laptop… – Less flexible than Bluetooth, need of a line of site – Comparable data rate Wi-Fi (WLAN) : Wireless LAN access – Far higher bandwidth and data rate than Bluetooth – Higher power consumption than Bluetooth – Requires infrastructure investment
Enough said
Standardized protocol supports interoperability of devices of different types.
Interference with other devices that use the same frequency such as baby monitors, microwave over etc. FHSS is used to avoid it.
Many companies are designing and researching impressive bluetooth applications in demand so this shows it has a bright future and it would be difficult for other technology to overcome.
ACL links and SCO links Inquires who’s there Paging creates a link in piconet Expanding a piconet by excessive pages
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