What Is Bluetooth? – In This Blog We Will What is Bluetooth , Bluetooth History , Bluetooth Technology And System Challenge to create Bluetooth And Many More
What Is Bluetooth?
Bluetooth is the name given to a technology standard using short-range radio links, intended to replace the cables connecting portable and/or fixed electronic devices
The standard defines a uniform structure for a wide range of devices to communicate with each other, with minimal user effort.
The technology also offers wireless access to LANs, PSTN, the mobile phone network and the Internet for a host of home appliances and portable handheld interfaces.
The standard has achieved global accepatance such that any Bluetooth device, anywhere in the world, can connect to other Bluetooth devices in its proximity, regardless of brand.
Bluetooth enabled electronic devices connect and communicate wirelessly via short-range, ad hoc networks called piconets.
Each unit can simultaneously communicate with up to seven other units per piconet.
To save power and/or to connect to even more devices Active Slaves can be Parked (up to 256 total!)
These piconets are established dynamically and automatically as Bluetooth devices enter and leave the radio proximity.
Moreover, each unit can simultaneously belong to several piconets Bluetooth devices can participate in multiple piconets simultaneously creating a topologies called Scatternets.
Scatternets can evolve into extremely complex structure creating a rich fabric of many, many, devices creating a topologies called Advacned scatternets.
Bluetooth was invented in 1994 by L. M. Ericsson of sweden. The standard is named after Harald Blaatand Bluetooth || king of Denmark 940-981 A.D
A runic stone has been erected in his capitol city jelling that depicts the chivalry of harald and the runes say.
Harald christenzed the danes. Harald controlled (united) Denmark and Norway. Harald thinks notebooks and cellular phones should seamlessly communicate.
The Bluetooth special interest group (sig) was founded by
- Nokia and
in february 1998, to develop an open specification for short-range wireless connectivity.
The group is now also promoted by
- Lucent Technologies and
More than 2500 companies have joined the SIG
The following section describes some of the requirements from the Bluetooth system and in essence, suggest the functionalities planned for it.
Although originally conceived to enable the design of universal wireless connections for laptops, computers and cellular telephones, it quickly became apparent that there were many other application for the Bluetooth standard.
Thus, the Bluetooth standard not only tries to overcome the limitations of the wired networks but also offers a variety of other services and creates opportunities for new usage models.
the Bluetooth system is now recognized more than just a cable replacement technology. various innovative usage models have opened up new areas where Bluetooth can be used.
These also impose many requirements on the system, some of which are discussed below.
The Most important requirement from the wireless link is that there should be a universal framework that offers means to access information across a diverse set of devices (for example, PDA’s laptops, PC’s mobile phones, home appliances etc.)
- in a seamless.
- user friendly and
- efficient manner.
In the practical scenario all devices are not expected to be capable of all functionalities and users too many expect their familiar devices to perform their basic functions in the usual way.
So Bluetooth must offer the facility for collaboration
- between devices
- in proximity of one another
where every device provides its inherent function based on
- its form
- user interface,
- cost and power,
but additional services emerge due to the synergy resulting out of the collaboration.
the standard must enable the devices to establish ad hoc connections.
Also introduced is the unconscious connectivity paradigm, where devices can connect to those in priximity almost without any user command or interaction.
Support for both data and voice is expected, as these are the two most importand kinds of information being transmitted over networks today. ( The requirements of video and streaming multimedia are also being imposed on the future versions of Bluetooth).
The standard should be able to incorporate new usage models without requireing any registration of the new service with a central authority.
The Communications should offer similar protection as in cables. There Should not be any compromises on security in switching over to wireless.
The implementations of the standard should be
- small and
- power efficient for easy mobile usage.
It is necessary for the rapid deployment of the system and for the Bluetooth benefits to actually reach the users that a large number of devices be enabled with the Bluetooth Standard.
The devices to be enabled comprise a highly non-uniform set and no single company can have the expertise to manufacture all these.
For this and other reasons, the bluetooth standard has been made royalty free and its worldwide acceptance should be facilitated.
The Above requirements involve great technical complexity not only in terms of the functionalities to be provided but also in terms of the power and size requirements.
The technology designed to meet the above requirements must face the following technical challenges:
- The system has to use an unlicensed band for universal acceptance and usage. thus the industrial, scientific and medical ( ISM ) band has been selected for Bluetooth.
- The challenge here is to make the system robust to interference from other sources in this band, which include not only ISM band communication systems but also microwave ovens.
- Preferably, each trasmitter itself should use the minimum power required so as not to increase the noise for other users.
- The transceivers should be able to adapt to a rapidly changing enviorment, as the devices will usually be mobile.
- the well-known problems in wireless systems such as multi-path fading must be handled.
- Also the connection establishment and routing protocols have to operate in an enviorment where the Number, location and variety of Bluetooth devices will change dynamically with fair amount of rapidity.
The size of the implemetation should be small for easy integration into handheld and mobile devices. the power consumption should not be more than a small fraction of the host devices into which the Bluetooth capability is to be introduced.
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