Bluetooth - Overview


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Bluetooth - Overview

  1. 1. Introduction History Origin of the Bluetooth name Symbol of Bluetooth Bluetooth Protocol Stack How Bluetooth works? Bluetooth topology Advantages and disadvantages of Bluetooth. Conclusion
  2. 2. • Wireless technology • Used to transfer data between different electronic devices. • Distance of data transmission - Small (Compare to other modes of wireless communication). • Eradicates - Wires, Cables, Adapters.,
  3. 3. • 1994 – Ericsson Telecommunication (main idea). • Objective – eliminate the cables between the mobile telephones and the desktop devices, headset, etc.., • In February, 1998 – (Ericsson, Nokia , IBM , Toshiba and Intel) - SPECIAL INTEREST GROUP. • Now , Bluetooth is managed by the Bluetooth Special Interest Group.( more than 19,000 companies) in the areas of telecommunication, computing , networking and consumer electronics.. SPECIAL INTEREST GROUP
  4. 4. • From an article EE Times: Jim Kardach , an Intel Engineer. • The name was taken from the 10th century, Second king of Denmark, “King Harald Bluetooth” who was famous for uniting Scandinavia (just as them, to unite the PC and cellular Industries with a short range of wireless link). • By February 1997, SIG formed developing the official name. • The top two names were “Radiowire” and “PAN”. • In April, SIG board meeting voted for “PAN”. • A search showed that the name was already in use. • As launch date neared, running out of time , the SIG team had no other alternative than to adopt “Bluetooth” as the official name.
  5. 5. • Harald (transcribed by H) and Bluetooth (transcribed by B)
  6. 6. Bluetooth Radio Baseband LMP L2CAP Audio RFCOMM PPP IP UDP TCP WAP WAE OBEX vCard/vCal AT- Commands TCS BIN Host Controller Interface (HCI) Bluetooth Core Protocol Adopted Protocol Cable Replacement Protocol SDP Telephony Protocol
  7. 7. Bluetooth Radio : specifics details of the air interface, including frequency, frequency hopping, modulation scheme, and transmission power. Baseband: concerned with connection establishment within a piconet, addressing, packet format, timing and power control. Link manager protocol (LMP): establishes the link setup between Bluetooth devices and manages ongoing links, including security aspects (e.g. authentication and encryption), and control and negotiation of baseband packet size .
  8. 8. Logical link control and adaptation protocol (L2CAP): adapts upper layer protocols to the baseband layer. Provides both connectionless and connection-oriented services. Service discovery protocol (SDP): handles device information, services, and queries for service characteristics between two or more Bluetooth devices. Host Controller Interface (HCI): provides an interface method for accessing the Bluetooth hardware capabilities. It contains a command interface, which acts between the Baseband controller and link manager .
  9. 9. TCS BIN (Telephony Control Service): bit-oriented protocol that defines the call control signaling for the establishment of voice and data calls between Bluetooth devices. OBEX(OBject EXchange) : Session-layer protocol for the exchange of objects, providing a model for object and operation representation RFCOMM: a reliable transport protocol, which provides emulation of RS232 serial ports over the L2CAP protocol WAE/WAP: Bluetooth incorporates the wireless application environment and the wireless application protocol into its architecture.
  10. 10. • ISM band ranges between 2.400 GHZ to 2.483 GHZ. •BWT enabled devices uses a technique called FREQUENCY HOPPING . • Data is divided into small pieces called Packets. •Transmitter and receiver exchange a data packet at one frequency to exchange, and then they hop to another frequency to exchange another packet. •They repeat this process until all the data is transmitted.
  11. 11. BWT devices randomly hop between frequencies up to 1600 times per second, much faster than other types of devices that use the ISM band.
  12. 12. •BWT enabled devices form network topologies called Piconets and Scatternets. •Piconet: - consists of up to eight BWT enabled devices. - when a piconet is established, one device (primary device/ master) sets the frequency – hopping pattern and the other device (secondary device / slave) synchronize their signals to the same pattern. •Scatter net: - in which two or more piconets connected by a common device.
  13. 13. Piconet
  14. 14. Scatternet
  15. 15. Bluetooth devices are wireless. Bluetooth technology is inexpensive. Bluetooth is Automatic. Low energy consumption. Share voice and data.
  16. 16. Bluetooth devices can not be connected with more than one device at a time, as it finds problem in discovering the intended device. Bluetooth has a low data rate (i.e 1 MB ps) in comparison to infra- red (i.e 4 MB ps).
  17. 17. Simple Choice for Convenient, wire-free, short range communication between devices. Bluetooth enabled products do not need to install driver software. Latest- This technology is now available in Fourth version. Fourth version – low power, low cost, built – in-security, robustness , ease of use and ad-hoc networking abilities. Leading technology. Shipping over 5 million units every week.
  18. 18. By, SHOBANA. P MCA, Ethiraj College for women March 23,2014.