Bluetooth 4.0: An introduction to Bluetooth Low Energy—Part I

URL : http://www.eetimes.com/document.asp?doc_id=1278927

 

Figure 1.  Bluetooth LE channel arrangements. The channel plan consists of 37 data communication channels and 3 advertising channels used for device discovery. Advertising channels are allocated in different parts of the spectrum to provide immunity against interference from 802.11/Wi-Fi

.....

Figure 2: Bluetooth LE over-the-air frame breakdown. Different PDU types are used for advertising and data channels: the advertising channel carries the device’s discovery and connection establishment information; after a connection is established, a data channel PDU provides link control data and payload for higher level protocols. 

......