 - Sniff subrating is a Bluetooth feature designed to increase battery life as much as 500 percent for devices whose typical usage involves a significant amount of inactive time. Such devices include keyboards, mice, headsets, and home sensor networks. Sniff subrating was introduced as part of the Bluetooth Core Specification Version 2.1 + EDR (Enhanced Data Rate).
Sniff subrating enables Bluetooth 2.1 devices to decide among themselves how long they will wait before sending keepalive messages to one another. Previous Bluetooth implementations featured keepalive 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. Because keepalive message exchanges often comprise the vast majority of activity for devices that are frequently idle, this technique extends their battery life significantly.
Existing Bluetooth devices that predate the specification release (mid-2007) cannot benefit from the 2.1 + EDR specification. Only devices that include circuitry developed to comply with the 2.1 +EDR specification will be able to take advantage of sniff subrating (and other features) to extend battery life as described here.
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Learn more about Bluetooth |
| Bluetooth overview: Bluetooth overview -- discover how it's used and where it fits into the world of wireless. |
| A Bluetooth update: Discover the real beauty of Bluetooth -- the rich set of capabilities and applications defined at higher levels of the Bluetooth protocol stack. |
| Nokia's Wibree vs. Bluetooth as PAN of choice: John Shepler explains Wibree, Nokia's new Personal Area Network initiative. |
| "Mobile Computing," Chapter 4: Emerging technologies: This chapter covers Bluetooth, RFID, WiMax-802.16, Mobile IP, IPv6 and Java Card. |
| Wireless Hacks, 2nd Edition: Hack 2 -- Set up Bluetooth on Windows XP: The Bluetooth wireless standard gets computers and gadgets talking to each other. This chapter from "Wireless Hacks, 2nd Edition" shows how to set it up on Windows XP. |
| Wireless Hacks, 2nd Edition: Hack 1 -- Set up Bluetooth on Linux: Linux kernels from 2.6 onward have easy-to-use tools for Bluetooth. Hack 1 shows you how to set up BlueZ stack, the officially supported way to use Bluetooth in Linux. |
| Step-by-Step Guide: Five Bluetooth security basics: Learn how to protect your network from Bluetooth threats with these five steps for securing Bluetooth devices in the enterprise. |
| LAST UPDATED: |
01 Feb 2008
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