Bluetooth 2.1 + EDR added further enhancements to the Bluetooth 2 spec—better, faster pairing, with fewer steps and lower power slur page still, depending on what you're doing. It also adds support for Near Field Communications (NFC), for completely auto magical pairing.
Bluetooth
Bluetooth 3.0 + HS and Bluetooth Low Energy
Oh hey, you made it. The Bluetooth Core Specification 3.0 High Speed was formally adopted a week ago.
Oh hey, you made it. The Bluetooth Core Specification 3.0 High Speed was formally adopted a week ago.
The big deal is that has crazy fast data speeds of up to 24Mbps (fast for Bluetooth, that is), thanks to the fact it piggybacks on good old 802.11 Wi-Fi radio. The standard Bluetooth radio is used for the boring, low intensity part, like profiles and whatnot, but the data shakedown happens over 802.11 when you're doing things like wirelessly syncing music libraries, downloading photos to a printer or sending video files, so you're only using lots of juice when you need to. Unicast Connectionless Data is a feature that'll make devices more responsive (less lag, yo) and Enhanced Power Control will use power more smart and efficiently (so, using less of it, though transferring heavy files like whole music libraries is gonna suck on the power teet hard, obviously). No device has it now, but we should be seeing it live in the next 9 to 12 months, which isn't a bad turnaround, considering it took 4 years for the first Bluetooth 1.0 devices to show up.
Bluetooth 2.0+EDR and Bluetooth 2.1+EDR are specifications for short-range wireless data exchange. Both Version 2.0 and 2.1 support EDR (Enhanced Data Rate), a faster PSK modulation scheme capable of transmitting data 2 or 3 times faster than previous versions of Bluetooth.
Version 2.1+EDR is built to be more secure and makeman-in-the-middle (eavesdropping) attacks more difficult. Connecting, which is called "pairing" is easier than in previous versions. In version 2, a Bluetooth device will make a connection automatically and all the end user has to do is confirm the connection. Version 2 also allows multiple Bluetooth connections at the same time.
A feature called Sniff Subrating extends battery life by reducing the active duty cycle of Bluetooth devices like keyboards and mice to improve battery life. Bluetooth hosts can specify maximum transmit and receive latencies so that low-power devices can know how often they must exit and re-enter "sniff mode." This can result in up to five times the battery life experienced by older low-power Bluetooth devices.
| Specifications | Bluetooth 1.0 | Bluetooth 1.2 | Bluetooth 2.0+EDR (enhanced data rate) | Bluetooth 2.1+EDR (enhanced data rate) | Bluetooth 3.0 HS (high speed) |
| Transmission rate | 721 kbit/s | 721 kbit/s | 2.1 Mbits/s | 3 Mbits/s | 24 Mbit/s |
| Adopted | 2002 | 2005 | 2004 | 2007 | 2009 |
| Backward compatible |  | yes | yes | yes | yes |
| Simple Secure Pairing | | yes | yes | yes | yes |
| Near Field Communication | | | | yes | yes |
| Sniff Subrating | | | | yes | yes |
| 802.11 Protocol Adaptation Layer (PAL) | | | | | yes |
| Standard PANrange | 10 meters (33 feet) | 10 meters (33 feet) | 10 meters (33 feet) |
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