Bluetooth - The New And Advanced Technology

Bluetooth is the advance tehnology mainly used to establish wireless connection between two bluetooth enable devices.
it has some limited range,this is the the only problem with this.on other hand it has many advantages too which discuss later.
It is a cable-replacement technology,which generally means technology using short-range radio links,
intended to replace the cables connecting portable and/or fixed electronic devices i-e it is totally wireless.
Bluetooth conceived initially by Ericsson in 1994,
set to commercially come out in bulk around 2002. In this,
small chip (radio chip) is to be plugged into bluetooth devices like -computers, printers,
mobile phones, etc.
SOME INTERESTING AND USEFULL INFORMATION ABOUT BLUETOOTH
i. The Bluetooth Special Interest Group (SIG) was founded by Ericsson, IBM, Intel, Nokia and Toshiba in February 1998, to develop an open specification for short-range wireless connectivity.
ii. Bluetooth devices within 10m can share up to 720kbps of capacity
iii. Projected cost for a Bluetooth chip is low + its low power consumption, means you could literally place one anywhere
iv. It Can operate on both circuit and packet switching modes, providing both synchronous and asynchronous data services.
v. It is intended to support an open-ended list of applications, including data, audio, graphics and even video.

BLUETOOTH MUST BE ABLE TO –
Recognize any other Bluetooth device in radio range
Permit easy connection of these devices
Be aware of the device types
Support service discovery
Support connectivity aware applications

EXAMPLES OF BLUETOOTH USES -
• Cheching email: access email while the PC is still in the briefcase; when PC receives an email, you are notified through the mobile phone. Use the mobile phone to browse the email.
• Cordless desktop: connect your desktop/laptop cordlessly to printers, scanner, keyboard, mouse, etc.

BLUETOOTH ARCHITECTURE -
In bluetooth technology up to 8 devices can communicate in a small network, called piconet.10 piconets can coexist in the same coverage range of the Bluetooth radio.Each piconet has 1 MASTER and the rest serve as SLAVES. SLAVES within a piconet only have links to the MASTER.
PHYSICAL LINKS -
Synchronous Connection Oriented (SCO) : allocates a fixed bw between a point-to-point connection involving the master and one slave. The master reserves slots periodically. It primarily supports time-bounded information like voice. SCO packets do not include a CRC and are never retransmitted.The master can support up to 3 simultaneous SCO links
Asynchronous connectionless (ACL) : a point-to-multipoint link between the master and all slaves in the piconet. Packet-switch style of connectionNo bw reservation possible.Delivery may be guaranteed thru error detection and retransmission.Only single ACL link can exist.
BLUETOOTH LIMITATIONS -
Does not address routing, most network functions are pushed into the link layer.Does not support multi-hop multicasting.Does not address how to cope with mobility. No. of nodes in piconet is limited.Does not address power-saving methods done at upper layers, above the link-layer.

CONCLUSION –
Bluetooth is a global, RF-based (ISM band: 2.4GHz), short-range, connectivity solution for portable, personal devices.it is not just a radio, it is an end-to-end solution.Implanting Bluetooth technology in a single chip will allow many devices to be Bluetooth-enabledLimitations of Bluetooth need to be addressed
THE REAL IMPACT OF BLUETOOTH STILL TO BE SEEN…….VERY SOON