Bluetooth is a short-range wireless communication technology which is intended to replace wired serial communication i.e. facilitating cable replacement technology which is operating in the frequencies between 2.4 and 2.485 gigahertz (GHz) having high level of security, based on Ad-hoc technology which allows you to share music, videos, photos, & other information wirelessly between paired devices.
Bluetooth have been evolved which include v1.0, v1.1, v1.2, v2.0+EDR, v2.1+EDR, v3.0+HS, v4.0 LE. These upgradation is on the basis of improvements in speed, range and data capacity. Bluetooth technology is based on IEEE 802.15.1 standard and all the versions have different speed and data rate requirements. The important thing to be noted is that the additional features supported by the higher versions or standards of Bluetooth are optional and also they do not affect the encoding and transmission of audio. In other words, all the Bluetooth versions are compatible with their previous versions which gives the advantage that device with one version can interoperate with the other version.
Different standards of Bluetooth can be listed as:
- Bluetooth v1.0 –
It was the first standard of Bluetooth technology, faced many difficulties with interoperability as manufacturers were facing problems and difficulty in making their products interoperable, being the drawback of this version.
- Bluetooth v1.1 –
This version fixed all those problems which were faced from v1.0 i.e. it fixed the problem of interoperability and also added non encrypted channels and signal strength indicators to it.
- Bluetooth v1.2 –
This version gave faster transfer or transmission speed as compared to that of v1.1, up to 721 kbit/s, better transmission involving retransmission of corrupted data packets if any.
- Bluetooth v2.0+EDR –
This version introduced AFH and Enhanced Data Rate (EDR) technology, which is used for faster transmission of data and allowing its users to theoretically boost data transfer rate up to 3 megabits per second (Mbit/s) & maximum data transfer rate is 2.1 Mbit/s. EDR can provide a lower power consumption i.e, it will draw low power to operate. According to the specification, Bluetooth v2.0+EDR, EDR is an optional feature in this version.
- Bluetooth v2.1+EDR –
This version improves the pairing experience for Bluetooth devices & let device pairing happen much faster and more easily, while increasing the overall security and use.
- Bluetooth v3.0+HS –
This version could reach data transfer speed of up to 24 Mbits/s & the important feature of this version is its high-speed data transfer and can able to transfer large amounts of data.
- Bluetooth v4.0 LE –
Bluetooth Low energy, it kept data rates at up by lowering the power, & it was mainly designed to frequently transmit data to devices, such as smart devices including fitness bands, smart watches etc, while saving power. This version is also called as Bluetooth Smart & mainly used by Health and fitness companies.