Innovation In Wireless Communication Protocols In Smart Devices
Abstract- Bluetooth 4.0 (code named Bluetooth Lower Energy) is a new protocol specification defined by the Bluetooth
SIG (Special Interest Group). Bluetooth 4.0 is a lower energy wireless communication protocol, which will allow small
devices to transmit data power efficiently. The purpose of this paper is to cover the brief about the low power wireless
technologies and architecture of Bluetooth 4.0.
Currently there are other short range low power wireless technologies in the market (IEEE 802.15.4, ZigBee, ANT and
other proprietary solutions), so what is it all about new Bluetooth specification? What is it bringing on to the table? Well
none of these wireless technologies have achieved notable market capitalization as Bluetooth technology. So how does it
solve the problem? One of the possible solutions is to capitalize on the Bluetooth technology market success and build a
technology which can be incorporated within existing Bluetooth® chip.
The Bluetooth 4.0 can be implemented either as Bluetooth dual mode (which is will communicate with single mode
devices and classical Bluetooth devices) or only Bluetooth single mode (Which is power optimized and specifically designed
for low power devices).
The low power devices (like wrist watch, TV remote controller, industrial sensors and Medical and Fitness devices)
demands for highly power efficient wireless protocols, these devices can use the single mode chips and devices like mobiles,
Computer and sensor controller can use Dual mode through which these device can communicate with low power devices
and classical Bluetooth devices. The goal was to build a low cost wireless technology through which devices can work on
coin cell batteries for more than a year, which resulted single mode Bluetooth 4.0.
The new Bluetooth 4.0 is designed to coexist with existing Bluetooth specifications. It works in the same frequency
bandwidth (which is within ISM band – 2.4000 to 2.4835) and uses frequency hopping mechanism. But Bluetooth 4.0
divides bandwidth into 39 channels, whereas classical Bluetooth divides into 78 channels and works using a simple hopping
mechanism (note that hopping frequency is different for classical Bluetooth).
The Bluetooth 4.0 provides a unique blend of options through which device manufactures can develop high power devices
with Dual mode which can communicate to low powered devices using LE links as well as to other high powered devices
using normal Bluetooth links and silicon cost remains same as the same radio is being reused. The low powered devices can
make use of power efficient single mode which is low cost and low powered. New protocol stack also provides simple
interface for application programmers.