Bluetooth technology is a short-range wireless communication technology to replace the cables that connect electronic devices, allowing a person to have a telephone conversation via headphones, use a wireless mouse and synchronize information from a mobile phone to a PC, all using the same system kernel.
The Bluetooth RF transceiver (or physical layer) operates in the unlicensed ISM band centered at 2.4 GHz. The platform uses a frequency hopping transceiver to combat interference and fading.
Bluetooth forms a set of devices synchronized in this way piconet, which may contain one master and up to seven active slaves, with additional slaves not actively participating in the network. Style, with the master device providing synchronization references.
Bluetooth Connection among Bluetooth Devices
Let’s say that the main device is your mobile phone. All other devices in the piconet are known as slaves. This may include headphones, GPS receivers, MP3 players, car stereos, etc.
Devices in a piconet use a certain frequency hopping pattern, which is computationally determined by the main device. The basic navigation mode is a quasi-random order of 79 frequencies in the ISM band. The navigation mode can be adapted to exclude part of the frequencies used by interfering devices. Adaptive navigation technology improves the coexistence of Bluetooth with fixed ISM system.
Slots are the physical channel (or wireless link) is divided into time units . Data can be transferred between Bluetooth-enabled devices in packets placed in these slots. Frequency hops occur between packet transmission or reception. Different frequency will help transmit the single packets within the ISM band.
One and more transport link are using the physical channel for logical link transportation. Each type of link has a specific use. One of the complications associated with wireless technology is often the process of connecting wireless devices.
Bluetooth Technology in Bluetooth Devices
Bluetooth technology uses your device’s “query” and “inspection” principles. Scanners listen to known frequencies of devices that are actively querying. Upon receiving a query, the scanning device sends a response with the information needed for the querying device. To identify and display the nature of the device that identified the signal.
Let’s say you want to print photos wireless from your mobile phone to a nearby printer. it go to the image on your phone and select Print as an option to send that image. The phone will start searching for devices in the area. The printer will respond to the query. It will appear on the phone as an available printing device. When you select a Bluetooth wireless printer, the printing process begins by creating connections in consecutive higher layers of the Bluetooth protocol stack that control the printing function.
all this complexity continues without the user realizing anything more than the task he is trying to complete, such as connecting devices, talking hands-free or listening to high-quality stereo music on a wireless headset.