Bluetooth working & principle

[Abhilash Dixit]

I want to know basic principle & working of bluetooth

 

[bhav]

perhaps this may get you started

http://en.kioskea.net/contents/bluetooth/bluetooth-fonctionnement.php3

 

[jessicalennita]

Bluetooth is an open wireless technology used to transfer or interchange the data with in the short distances. It can work up to 30 feet and it includes security and interoperability with the other networking standards.

 

[nacccy123]

I want to know basic principle & working of bluetooth

Bluetooth is a technology whereby devices communicate wirelessly to achieve data transfer at the rate of 720 kbps within a range of 10 to 100 meters.
Working of Bluetooth Technology
Now, about how Bluetooth works. Bluetooth Special Interest Group manages and maintains the Bluetooth Standard. IEEE has accepted it as 802.15la standard. Bluetooth was developed with the purpose of creating a single digital wireless protocol, capable of connecting multiple devices and getting over synchronization issues between them. It enables short-range wireless communication thus replacing the wires that are used to connect multiple devices.

Transmission over Short Distances
The Bluetooth RF transceiver lies at the physical layer. There are 79 Bluetooth channels spaced 1MHz apart. A spread spectrum technology is used at the physical layer. Both voice and data transmissions over short distances are possible, creating wireless PANs.

Instructions to Communicate
A Bluetooth device consists of an adapter. A Bluetooth adapter can be built into a device or can be in the form of a card that connects to a device. Instructions are embedded into the device, which enable it to communicate with other devices.

Packet Segmentation and Reassembly
When devices come in each other's radio range, their link managers discover each other. Link management protocol (LMP) engages itself in peer-to-peer message exchange. LMP layer performs link setup and negotiation of packet size. Segmentation and reassembly of packets is done, if needed.

Connection Sets Up
The service delivery protocol enables a Bluetooth device to join a piconet. A device inquires what services are available with the piconet. Bluetooth GlobalID (a unique identification for each device in the network) is exchanged between the devices. Their profiles are matched and a connection is set up.

Signal Transfer
Bluetooth uses frequency hopping in time slots, which means that the Bluetooth signals avoid interference with other signals by hopping to a new frequency after transmission or reception of every packet. One packet can cover up to five time slots. Bluetooth can support an asynchronous data channel, or up to 3 simultaneous synchronous voice channels, or a channel, which concurrently supports asynchronous data and synchronous voice.

Master Slave
Bluetooth technology makes use of the concept of a master and slave. Devices have to wait until the master allows them to talk! One master and up to seven slaves employ a star topology to form a piconet and begin to communicate with one another (as per orders from their master of course)!

Bluetooth Applications1.Bluetooth has a wide range of applications. Wireless communication between a mobile phone and a headset is possible by way of Bluetooth.
2.Computers can form a wireless network in a limited space and when bandwidth requirement is less.
3.Unwired communication between the input and output devices of a computer is possible by means of Bluetooth technology.
4.Transfer of files and data between devices with OBEX is achieved. OBEX is a session protocol that provides the functionality of HTTP in a lighter way.
5.Some game consoles use Bluetooth for their wireless controllers.
6.Bluetooth-enabled mobile phones and modems can make possible, dial-up Internet connections for PCs or PDAs.


Hope these can help you.

 

[qib]

Basics of Bluetooth from Wikipedia: http://en.wikipedia.org/wiki/Bluetooth
Simple introduction to the latest Bluetooth Smart or Bluetooth 4.0: http://www.chipscoop.com/2012/08/what-is-bluetooth-smart.html