with 1.1, and was adopted by the Bluetooth SIG on July 26, 2007.This
specification includes the following features:
* Extended inquiry response: provides more information during the
inquiry procedure to allow better filtering of devices before
connection. This information includes the name of the device, a list
of services the device supports, as well as other information like the
time of day, and pairing information.
* Sniff subrating: reduces the power consumption when devices are
in the sniff low-power mode, especially on links with asymmetric data
flows. Human interface devices (HID) are expected to benefit the most,
with mouse and keyboard devices increasing the battery life by a
factor of 3 to 10. It lets devices decide how long they will wait
before sending keepalive messages to one another. Previous Bluetooth
implementations featured keep alive message frequencies of up to
several times per second. In contrast, the 2.1 specification allows
pairs of devices to negotiate this value between them to as
infrequently as once every 5 or 10 seconds.
* Encryption Pause Resume: enables an encryption key to be
refreshed, enabling much stronger encryption for connections that stay
up for longer than 23.3 hours (one Bluetooth day).
* Secure Simple Pairing: radically improves the pairing experience
for Bluetooth devices, while increasing the use and strength of
security. It is expected that this feature will significantly increase
the use of Bluetooth.
* Near Field Communication (NFC) cooperation: automatic creation
of secure Bluetooth connections when NFC radio interface is also
available. For example, a headset should be paired with a Bluetooth
2.1 phone including NFC just by bringing the two devices close to each
other (a few centimeters). Another example is automatic uploading of
photos from a mobile phone or camera to a digital picture frame just
by bringing the phone or camera close to the frame.
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