1. University of Eastern Finland School of Computing P.O. Box 111 FIN- 80101 Joensuu Tel. +358 13 251 7959 fax +358 13 251 7955 www.uef.fi/cs Bluetooth Mikko Malinen Location-aware mobile applications development course University of Eastern Finland 8th February, 2011

2. University of Eastern Finland School of Computing P.O. Box 111 FIN- 80101 Joensuu Tel. +358 13 251 7959 fax +358 13 251 7955 www.uef.fi/cs Definition Bluetooth is an open wireless technology standard for exchanging data over short distances (using short wavelength radio transmissions) from fixed and mobile devices.

3. University of Eastern Finland School of Computing P.O. Box 111 FIN- 80101 Joensuu Tel. +358 13 251 7959 fax +358 13 251 7955 www.uef.fi/cs Bluetooth is created by Ericsson in 1994. Today Bluetooth is managed by the Bluetooth Special Interest Group, with a membership of over 13000 companies worldwide.

4. University of Eastern Finland School of Computing P.O. Box 111 FIN- 80101 Joensuu Tel. +358 13 251 7959 fax +358 13 251 7955 www.uef.fi/cs Logo comes from medieval King Harald’s initials: +

5. University of Eastern Finland School of Computing P.O. Box 111 FIN- 80101 Joensuu Tel. +358 13 251 7959 fax +358 13 251 7955 www.uef.fi/cs Modulation Originally GFSK Bluetooth 2.0+EDR π/4-DQPSK 8DPSK

6. University of Eastern Finland School of Computing P.O. Box 111 FIN- 80101 Joensuu Tel. +358 13 251 7959 fax +358 13 251 7955 www.uef.fi/cs One master may communicate with 7 slaves. Master transmits in even slots and receives in odd slots. Slave receives in even slots and transmits in odd slots.

7. University of Eastern Finland School of Computing P.O. Box 111 FIN- 80101 Joensuu Tel. +358 13 251 7959 fax +358 13 251 7955 www.uef.fi/cs It is a secure way to transmit information between devices such as faxes, mobile phones, telephones, laptops, personal computers, printers, GPS receivers, digital cameras, and video game consoles. Mobile phone headset.

8. University of Eastern Finland School of Computing P.O. Box 111 FIN- 80101 Joensuu Tel. +358 13 251 7959 fax +358 13 251 7955 www.uef.fi/cs Range

9. University of Eastern Finland School of Computing P.O. Box 111 FIN- 80101 Joensuu Tel. +358 13 251 7959 fax +358 13 251 7955 www.uef.fi/cs Throughput

10. University of Eastern Finland School of Computing P.O. Box 111 FIN- 80101 Joensuu Tel. +358 13 251 7959 fax +358 13 251 7955 www.uef.fi/cs Bluetooth vs. WiFi WiFi uses the same radio frequencies as Bluetooth, but with higher power, resulting in faster connection and a better range from a base station.

11. University of Eastern Finland School of Computing P.O. Box 111 FIN- 80101 Joensuu Tel. +358 13 251 7959 fax +358 13 251 7955 www.uef.fi/cs Computer requirements Internal Bluetooth card or a dongle. Internal Bluetooth card. A dongle.

12. University of Eastern Finland School of Computing P.O. Box 111 FIN- 80101 Joensuu Tel. +358 13 251 7959 fax +358 13 251 7955 www.uef.fi/cs Mobile phone requirements A Bluetooth-enabled mobile phone.

13. University of Eastern Finland School of Computing P.O. Box 111 FIN- 80101 Joensuu Tel. +358 13 251 7959 fax +358 13 251 7955 www.uef.fi/cs Bluetooth versions v1.1 v1.2 v2.0+EDR v2.1+EDR v3.0+HS High speed. negotiation Bluetooth device data transfer 802.11 link v4.0 Ultra-low power

14. University of Eastern Finland School of Computing P.O. Box 111 FIN- 80101 Joensuu Tel. +358 13 251 7959 fax +358 13 251 7955 www.uef.fi/cs Layer protocol architecture TCP/IP/UDP included! Mandatory protocols: LMP, L2CAP, SDP Also almost universally supported: HCI, RFCOMM

15. University of Eastern Finland School of Computing P.O. Box 111 FIN- 80101 Joensuu Tel. +358 13 251 7959 fax +358 13 251 7955 www.uef.fi/cs Error correction implemented •1/3 rate forward error correction (FEC) •2/3 rate FEC •Automatic repeat-request (ARQ)

16. University of Eastern Finland School of Computing P.O. Box 111 FIN- 80101 Joensuu Tel. +358 13 251 7959 fax +358 13 251 7955 www.uef.fi/cs Pairing Legacy pairing, ->v2.0: Enter same pin code to both devices Secure simple pairing, v2.1: Uses a form of public key cryptography ”Just works” or key comparison

17. University of Eastern Finland School of Computing P.O. Box 111 FIN- 80101 Joensuu Tel. +358 13 251 7959 fax +358 13 251 7955 www.uef.fi/cs Air interface 2.402-2.480 GHz, divided to 79 channels, change channels up to 1600 times per second.

18. University of Eastern Finland School of Computing P.O. Box 111 FIN- 80101 Joensuu Tel. +358 13 251 7959 fax +358 13 251 7955 www.uef.fi/cs Health concerns Class 2 and Class 3 Bluetooth devices are considered less of a potential hazard than mobile phones, and class 1 may be comparable to that of mobile phones.

19. University of Eastern Finland School of Computing P.O. Box 111 FIN- 80101 Joensuu Tel. +358 13 251 7959 fax +358 13 251 7955 www.uef.fi/cs Bluetooth Sample Code apps for Android http://www.androidzoom.com/android_a pplications/bluetooth%20sample%20c ode

20. University of Eastern Finland School of Computing P.O. Box 111 FIN- 80101 Joensuu Tel. +358 13 251 7959 fax +358 13 251 7955 www.uef.fi/cs Sources: Wikipedia http://www.androidzoom.com