Topics: Bluetooth, ISM band, IEEE 802.11 Pages: 2 (350 words) Published: September 11, 2014
.Bluetooth developed by SIG ( Special Interest Group). Bluetooth is originally described by Institute of Electrical and Electronics Engineers (IEEE) in 802.X standards [4].The first Bluetooth technology was described in 802.15 standards. which is based on had the primary aim to transfer data on layer 3 of the OSI-Model, where the Media Access Control (MAC Layer) could work with any of the two radio transmission layers and an infrared layer [6]. MAC Layer is a part of the security mechanism, enabling avoidance from collusions, during data transmission. Most widely used band by Bluetooth transmissions works at a frequency of 2.4GHz. However, in case that more than three different 2.4 GHz using BLUETOOTHs work in real-time at the same spot, they disturb each other’s communication due to radio interference. An alternative to the 2.4GHz band is the 6GHz band. Although networks using 6GHz band are less affected by interference, The 2.4 GHz ISM band is available and unlicensed in most countries[6]. Bluetooth technology also uses radio waves, it transmits them over a shorter distance. Its intended to be a wireless replacement for cables on phones,Headset,TV and most of electronics.

3.1 System-Architecture
The mode of System-Architectures mentioned in IEEE 802.15.1 standards is the Ad-hoc mode. While the Ad-hoc mode enables fast and spontaneous networking between two devices. 3.1.1 Ad-hoc Mode
In Ad-hoc mode two devices are connected together. To establish such a connection, one of the devices sends Beacons to provide the Bluetooth. The other device, which is in coverage area of the first one, receives these packets and both devices can connect to each other. It is not possible in Ad-hoc mode that a device A connects the device B over a device C. There are however methods extending the Ad-hoc mode to make this scenario possible. 3.2 Physical Layer

On Physical Layer it is to be decided, how data is going to be transferred and how the incoming...
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