1. BLUETOOTH AND ITS APPLICATION IN MOBILE PHONES
                                                                                                                                                
BLUETOOTH AND ITS APPLICATION IN MOBILE PHONES

2. Started by Ericsson Mobile Communication in 1994
Short range wireless technology
Operates in ISM band at 2.4 to GHz using
spread spectrum,frequency hopping full duplex signal at a nominal rate of 1600 hops/sec.

3. ADVANTAGE:
Low cost
Low power
Robustness
The ability to simultaneously handle both data and voice transmissions

4. COMMUNICATION
Short-range adhoc networks known as piconets
Communication is done through Master units

6. Establishing network connections

7. PROCEDURES
Inquiry – This enables a unit to discover which
units are in range and what their device addresses and
clocks are.
Paging- An actual connection can be established.

8. The master must poll the slave by sending POLL or
NULL packets to which the slaves will respond.
Link Manager Protocol procedure is carried out.
LMP_host_ connection_req
LMP_accepted or LMP_not_accepted

9. VARIOUS STATES OF
BLUETOOTH
                                                                                                               

10. BLUETOOTH OPERATIONAL STATUS
                                                                                                        

11. BLUETOOTH’S SECURITY
&
ERROR CORRECTION SCHEMES
Encryption and authentication
Frequency-hopping scheme in 1600 hops/sec
Automatic output power adaption
Forward Error correction
Automatic Repeat Request

12. ARQ_Automatic Repeat Request
                                                                                                                                      
On 2 occasions, the transmitted data blocks get corrupted, which is detected by the recipient.
So the next time that recipient get a chance to communicate with that sender (i.e. at the next appropriate timeslot),
the recipient sends a Negative Acknowledgement (a NAK, depicted in red), which prompts the other party to
re-transmit that data block.

13. APPLICATION IN MOBILE PHONES
                  

14. The Serendipity Server and connected mobile device