Bluetooth Technology | Mobile Computing Tutorial | Minigranth
Bluetooth Technology : Introduction
Bluetooth technology is a wireless technology based on mobile computing technology. Being an open wireless technology standard, it is used to send or receive data to connected devices present across a certain distance i.e. it uses a band of 2.4 to 2.485 GHz.
Bluetooth is also known as IEEE 802.15 standard.
The developing unit of this technology is a group of 5 companies called as Special Interest Group which was formed in 1998. The companies are Ericsson, Intel, IBM, Nokia and Toshiba.
The range of Bluetooth technology over which data can be exchanged is less than 10 meters but, the latest version of Bluetooth i.e. Bluetooth 5.0 can exchange data in a range of about 40-400 meters.
The speed at which data transmission occur is around 1 mbps.
Bluetooth Technology : Architecture
An architecture of Bluetooth is called as a “Piconet”.
Piconet offers the technology with the help of which data transmission occurs, based on is nodes i.e. Master node and Slave Nodes.
A master node is a node from which data is being sent and slave node is which the data is received.
Ultra-High frequency and short wavelength radio waves, through which data transmission occurs.
The Piconet used the concept of multiplexing as well as spread spectrum i.e. it is a combination of code division multiple access and frequency hopping spread spectrum.
Maximum number of Master Node →1
Maximum number of Slave Nodes →7
Maximum number of Nodes in a Piconet →8
Maximum number of devices that can be paired →28 – 1 = 255
Number of devices that can be parked → Infinite(∞).
Bluetooth Technology Architecture : Piconet
A parked node is a node which is ready to be connected and stand by node is a node which can either become a slave or parked node or either remains idle/disconnected.
Also, data transmission can only occur between master and slave nodes and not between slave and slave nodes.
If the connection from master node gets disconnected, the whole Piconet gets disconnected.
If two master nodes are connected together, then that network is called as Scatter-net.
We can thus conclude that with the increase in number of slaves/devices in a Piconet the data transmission speed decreases and if number of slaves/devices in a Piconet decreases then the data transmission speed increases.
Advantages : Bluetooth Technology
Very simple to form a Piconet.
Low energy consumption.
Disadvantages : Bluetooth Technology
Low in bandwidth.
Data transmission range is a constraint as it is very less.