Bluetooth is an industrial specification for wireless personal area networks (PANs). Bluetooth provides a way to connect and exchange information between devices like personal digital assistants (PDAs), mobile phones, laptops, PCs, printers and digital cameras via a secure, low-cost, globally available short range radio frequency. Bluetooth extends a violet beam to another Blutooth-capable device, allowing both devices to exchange information in 2 ways: chat and WiFi.
Bluetooth is a wirefree radio standard primarily designed for low power consumption, with a short range (power class depended 10 centimetres, 10 metres, 100 metres or up to 400 metres [1], ) and with a low-cost transceiver microchip in each device.
Bluetooth lets these devices talk to each other when they come in range, even if they are not in the same room, as long as they are within up to 100 metres (328 feet) of each other, dependent on the power class of the product. Products are available in one of three power classes:
- Class 1 (100 mW) [still readily available]: It has the longest range at up to 100 metres (320 ft).
- Class 2 (2.5 mW) [most common]: It allows a quoted transmission distance of 10 metres (32 ft).
- Class 3 (1 mW) [rare]: It allows transmission of 10 cm (3.9 in), with a maximum of 1 metre (3.2 ft).
Bluetooth specification was first developed by Ericsson, and was later formalized by the Bluetooth Special Interest Group (SIG). The SIG was formally announced on May 20, 1999. It was established by Sony Ericsson, IBM, Intel, Toshiba and Nokia, and later joined by many other companies as Associate or Adopter members. Bluetooth is also IEEE 802.15.1.
Bluetooth 1.0 and 1.0B
Versions 1.0 and 1.0B had numerous problems and the various manufacturers had great difficulties in making their products interoperable. 1.0 and 1.0B also had mandatory Bluetooth Hardware Device Address (BD_ADDR) transmission in the handshaking process, rendering anonymity impossible at a protocol level, which was a major set back for services planned to be used in Bluetooth environments, such as Consumerium.
Bluetooth 1.1
In version 1.1:
many errata found in the 1.0B specifications were fixed.
There was added support for non-encrypted channels.
Bluetooth 1.2
This version is backwards compatible with 1.1 and the major enhancements include
Adaptive Frequency Hopping (AFH), which improves resistance to radio frequency interference by avoiding using crowded frequencies in the hopping sequence
Higher transmission speeds in practice
extended Synchronous Connections (eSCO), which improves voice quality of audio links by allowing retransmissions of corrupted packets.
Received Signal Strength Indicator (RSSI)
Host Controller Interface (HCI) support for 3-wire UART
HCI access to timing information for Bluetooth applications.
Bluetooth 2.0
This version is backwards compatible with 1.x. The main enhancement is the introduction of Enhanced Data Rate (EDR) of 2.1 Mbit/s. This has the following effects (Bluetooth SIG, 2004):
3 times faster transmission speed (up to 10 times in certain cases).
Lower power consumption through reduced duty cycle.
Simplification of multi-link scenarios due to more available bandwidth.
Further improved BER (Bit Error Rate) performance.
Read more in Wikipedia Bluetooth article.