Bluetooth Technology

Mobile Computing Tutorial



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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.

 

Conditions

  • 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(∞).

 

This image describes the Bluetooth technology architecture which is commonly known as piconet.

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

  • Wireless technology.
  • Very simple to form a Piconet.
  • Cheap Technology.
  • Robust.
  • Low energy consumption.

Disadvantages : Bluetooth Technology

  • Low in bandwidth.
  • Data transmission range is a constraint as it is very less.

 

Applications : Bluetooth Technology

  • Blue-tooth Speakers.
  • Blue-tooth Headphones.
  • Blue-tooth Headsets(for calling purpose).
  • Wireless mouse and keyboard.
  • Blue-tooth gaming consoles.