Piconet and Scatternet in Bluetooth
- Bluetooth uses spread spectrum technologies at the Physical Layer while using both direct sequence and frequency hopping spread spectrum technologies.
- It uses connectionless (ACL–Asynchronous Connectionless Link) and connection-oriented (SCO– Synchronous Connection-oriented Link) links.
- Bluetooth allows users to make ad-hoc wireless connections between devices like mobile phones, desktop or notebook computers wirelessly.
- Also, Bluetooth operates in a globally available frequency band ensuring interoperability. Bluetooth uses the unlicensed 2.4GHz ISM (Industrial Scientific and Medical) frequency band.
- There are 79 available Bluetooth channels spaced 1MHz apart from 2.402 GHz to 2.480 GHz.
- The Bluetooth standard is managed and maintained by Bluetooth Special Interest Group.
- Data transfer at a speed of about 720 Kbps within 50 meters (150 feet) of range or beyond through walls, clothing and even luggage bags.
- Bluetooth protocol uses the concept of master and slave. In a master-slave protocol, a device cannot talk as and when they desire. They need to wait until the time the master allows them to talk.
- Also, The master and slaves together form a piconet. Up to seven “slave” devices can set to communicate with a “master”.
- Several of these piconets can link together to form a larger network in an ad-hoc manner.
- Moreover, The topology can think as flexible, multiple piconet structures. This network of piconets called scatter.
- A scatternet formed when a device from one piconet also acts as a member of another piconet. In this scheme, a device is a master in one piconet can simultaneously be a slave in the other one.