Bluetooth-Piiconet Formation

Bluetooth is a wireless process by which devices can communicate without a physical connection such as a cable.This expertise is based on radio waves, there can be objects or even walls placed between the communicating devices & the connection wont be disrupted.
Multiple devices connected in a network using bluetooth forms a piconet. Piconets can include anywhere from to eight devices. Bluetooth communication always designates of the Bluetooth devices as a main controlling unit i.e. master unit. While all other devices that follow master device are known as slave units. This makes Bluetooth process to be non colliding network. This means that after a Bluetooth device has been added to the Piconet, each device is assigned a specific time period to transmit & they do not collapse or overlap with each other units operating within the same Piconet. The master device acts as the hub i.e. all slave devices must must communicate through the master device in order to communicate with each other. In most piconets, the computer serves as the master device.
The master unit is responsible for synchronising all other devices. Clock & hopping sequences of master are used to perform synchronisation. The master also assigns numbers to the communication channels. The master unit sends a train of 16 identical page messages on 16 different hop frequencies defined for the device to be paged (slave unit). If there is no response, the master transmits a train on the remaining 16 hop frequencies in the wake-up sequence. The maximum delay before the master reaches the slave is two times the wakeup period is two.56 seconds while the average delay is half the wakeup period is 0.64 seconds.
Bluetooth makes use of a method known as spread-spectrum frequency hopping that makes it rare for over device to be transmitting on the same frequency at the same moment. In this method, the Bluetooth process hops over 79 channels, the probability of interfering (overlapping) with another Bluetooth process is less than one.5%.. Transmitters alter frequencies up to one,600 times every second in this case.
There's types of message "page" & "inquiry" responsible for the building of piconet:
The connection procedure of piconet is initiated by any of the device & this device later becomes the master for the network. Page message is used to form piconet only if the address is already known. While INQUIRY message is followed by a later PAGE message only if the address is unknown.

A slave device on a Bluetooth network or piconet can be in either active state or park state. As discussed before, active slave devices can be up to sseven but there can be up to fifty (255) parked slave devices. Parked devices retain time synchronization with the piconet but are otherwise disconnected & consume the lowest power (power consuming depend on the protocol used).