BLUETOOTH TECHNOLOGY-an OVERVIEW

Bluetooth technology essentially works by using short-range wireless communication technology to connect two devices together. This eliminates the need for cables or wires. Bluetooth allows you to listen to music from your mobile phone, tablet or iPad through wireless headphones. Wireless communication between a smartphone and a smart lock for unlocking doors. Wireless control of communication with iOS and Android device phones, tablets and portable wireless speakers. Wireless Bluetooth headset and Intercom. Idiomatically, a headset is sometimes called "a Bluetooth". Bluetooth was borrowed from the 10th-century, second king of Denmark, King “Harald Bluetooth”; The king was famous for uniting Scandinavia just as We intended to unite the PC and cellular industries with a short-range wireless link. IEEE 802.15. 1, more commonly known as Bluetooth, is a low-data-rate, low-power wireless networking standard aimed at replacing cables between lightweight devices [IEEE802. 15.1]. ... The Bluetooth stack defines many components above the PHY and MAC layers, some of which are optional. Range of Bluetooth is dependent on its class and primarily there are three classes of Bluetooth: Class 1 maximum power is100 mW with a range of 100 meters or 328 feet. Class 2: maximum power is 2.5 mW with a range of 10 meters or 33 feet (most Bluetooth headsets and headphones are common Class 2 devices). Class 3: maximum power is 1 mW and used for short range devices ( 10 cm) While the Bluetooth signal will work through walls, the more objects that are in between the devices, the less overall range the devices will have. The key features of Bluetooth technology are robustness, low power, and low cost, The fact that it has become a universal standard for exchanging data amongst a range of fixed and mobile devices. In addition, Bluetooth wireless technology has the ability to simultaneously handle both data and voice transmissions. Bluetooth is the wireless communications technology for developers which allows devices to communicate with each other without the need for a central device like a router or access point. Although most mobile devices and many PCs today support Bluetooth, the technology comes with a few disadvantages, Including slow data speeds, Poor data security and Shortened battery life. Bluetooth's low-power design limits its data communications speed. The Bluetooth is used in wireless head sets. Bluetooth is used to transfer files, images and MP3 or MP4 between cell phones. It is used in laptops and notebooks. It is used in PDAs (personal digital assistant). It is also used in printers. It is almost used in wireless communication (WAN). Piconet is a collection of devices connected in ad-hoc fashion. One unit acts as master and the other as slaves for the lifetime of piconet. Master (M) determines hopping pattern in the Piconet and the slaves (S) have to synchronize to this pattern. Each piconet has a unique hopping pattern. If a device wants to participate it has to synchronize to this. Each piconet has one master and upto 7 simultaneous slaves. Scatternet is the process of linking of multiple co-located piconets through the sharing of common master or slave devices. Devices can act as slave in one piconet and master of another piconet. Communication between different piconet takes place by devices jumping back and forth between these nets.