BLUETOOTH

1. BLUETOOTH
IEEE 802.15.1

2. BLUETOOTH
 Universal radio interface for ad-hoc wireless connectivity.
 Short range (10 m), low power consumption, license-free 2.45 GHz
ISM band.
 Voice and data transmission, approx. 1 Mbit/s gross data rate.
 Wireless Personal Area Network (WPAN)
 FHSS and TDD
 Frequency hopping with 1600 hops/s
 Hopping sequence in a pseudo random fashion, determined by a
master
 Time division duplex for send/receive separation

3. Piconet

4. Scatternet

5. Bluetooth Protocol Stack  Radio
 Baseband
 Link manager protocol
 Logical link control and adaptation
protocol (L2CAP)
 Service discovery protocol
Core Protocols of Bluetooth

6. RADIO LAYER
 It only defines the carrier frequencies and output power.
 A frequency-hopping/time-division duplex scheme is used for transmission,
with a fast hopping rate of 1,600 hops per second.
 The time between two hops is called a slot, which is an interval of 625 μs.
 Each slot uses a different frequency.
 Bluetooth uses 79 hop carriers equally spaced with 1 MHz.
 Bluetooth transceivers use Gaussian FSK for modulation.

7. BASEBAND LAYER
Frequency selection during data transmission
(1, 3, 5 SLOT PACKETS)

8. BASEBAND PACKET FORMAT
 Bluetooth offers two different types of links,
 Synchronous connection-oriented link (SCO)
 Asynchronous connectionless link (ACL)

9.  SCO (Synchronous Connection Oriented) – Voice
 Periodic single slot packet assignment, 64 Kbit/s full-duplex, point-to-point
 ACL (Asynchronous Connectionless) – Data
 Variable packet size (1,3,5 slots), asymmetric bandwidth, point-to-multipoint

10. LINK MANAGER PROTOCOL
BASEBAND STATES OF A BLUETOOTH DEVICE

11. LOGICAL LINK CONTROL AND
ADAPTATION PROTOCOL (L2CAP)
 Simple data link protocol on top of baseband
 Connection oriented, connectionless, and signaling channels
 Protocol multiplexing
 Segmentation & reassembly

12. SECURITY