(Ultra low power connectivity for small devices)By:

SUDESH BHATI

MCA-V

11CIAXX650

What is WIBREE?

Wibree is a new low power, low cost , interoperable radio technology for small devices.

Wibree complements other local connectivity technologies, consuming only a fraction of the power, enabling small, inexpensive implementations as well as easy integration with Bluetooth solutions.

Wibree is the first open technology offering connectivity between mobile devices or personal computers, and small, button cell battery power devices.

By extending the role, mobile devices can play in consumers' lives, this technology increases the growth potential in these market segments

Wibree fullfills the need for a radio technology that:

Allows communication between small button-cell battery devices and Bluetooth devices.

Forms a minimal cost and size addition to Bluetooth devices such as mobile phones and PCs.

Creates smaller and lower cost options for small button-cell battery devices.

Examples:

(1).Mouse communicating with computer using Wibree

(2).Here the keyboard is communicating with cell phone&the watch displays the heart beat and the stress applied to the bat.

Need for Wibree

No standard has been optimized for low power consumption for low duty cycle applications

Several years of battery lifetime on a coin cell battery

6 to 12 months battery lifetime on AA or AAA batteries

Key Features

Very low power consumptionForms a minimal cost and sizeAllows communication between small

battery-powered devicesCost efficient implementation with the

present Bluetooth modules

Types of Wibree chips

There are two types:

1. Stand alone mode Wibree

2. Dual mode Wibree

Stand alone mode Wibree :

Stand alone Wibree chip can communicate with other stand alone Wibree chips and/or dual mode chips.

Wibree

Example for stand alone mode:

Dual mode Wibree

A dual mode chip can communicate with other stand alone or dual mode Wibree chips in addition to other Bluetooth chips

Wibree

Wibree versus Bluetooth:

The device that is compatible with the bluetooth can communicate with the other device within 100meters of range.

The speed of the data transfer is upto 5Mbps.The power consumption is higher when

compared to Wibree.It is not suitable for smaller devices.

Bluetooth:

Wibree:

It can communicate with the other device within 10meters of range.

The power consumption is very low.The speed of data transfer is

upto1mbps.It is suitable for smaller devices.

(Different layers of wibree & bluetooth)

Wibree technologyWibree

technology

(LL)

PAL

Bluetooth:

It is the primary channel of the protocol.

0.400-2.4835 GHz is the frequency range at which it operates.

5 Mbps is the speed. It can communicates with the other

device upto 100meters.

RF channel:

Link controller:It contains master .Master just establishes connection with the

slaves.

Physical Layer:

Up to 10m range. 1 Mega bit/sec air data rate RF Antenna which will operate at the 2.4

GHz can work with the help of the Bluetooth antenna

Wibree:

Link Layer

Low power idle modeScan serviceConnection set-up serviceData exchange serviceTraffic scheduling services

Wibree Profiles

Watch profile

Human Interface Device (HID) profile

Sensor profile

How power is saved in Wibree

Wibree is aiming to produce a radio that can transmit a small packet of data approximately every second

This low power drain is achieved by designing a radio and protocol that lets the radio stay asleep for most of its life. It can wake up quickly, when it will broadcast its requirement to transfer data on a number of advertising channels across the spectrum.

Conclusion

Taking all of these factors together, Wibree has the potential to transform consumer devices.

Today Wibree is a Nokia solution. However, the major Bluetooth chip vendors including Cambridge Silicon Radio and Broadcom are supporting it. That means it will reside within the chips in almost every brand of handset.

Wibree is placed to own the wireless healthcare market.

References

1. www.wibree.com Official website of wibree

2. www.ezurio.com Understanding of wireless range

3. www.ezurio.com White paper on Wibree

4. www.ieee802.org5. www.nordicsemi.no