29-08-2011, 11:26 AM
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Abstract
Wibree is a digital radio technology (intended to become an open standard of wireless communications) designed for ultra low power consumption (button cell batteries) within a short range (10 meters / 30 ft) based around low-cost transceiver microchips in each device.
Wibree is based on dual mode and single mode implementation. In the dual mode implementation the Wibree functionality is an add-on feature inside Bluetooth circuitry sharing a great deal of existing functionality and the stand alone implementations are power and cost optimized designs. Wibree is the first open technology offering connectivity between mobile devices or personal computers, and small, button cell battery power devices such as watches, wireless keyboards, toys, and sports sensors. Also known as Ultra Low Power Bluetooth, Wibree is poised to become the fastest growing wireless standard ever. Its symbiotic relationship with Bluetooth will open up substantial opportunities for network operators in consumer-based services. Less publicized are its many features that will prove of equal significance to the industrial market.
This concept of Wibree within a Bluetooth chip is vitally important in understanding its place and the role that it can fulfil. Because low power, personal Wibree devices will be able to communicate with handsets, it means that in time every mobile phone becomes a Wibree gateway to the mobile network. So every Wibree device can communicate with the internet, allowing information to be sent backwards and forwards. And because the data rates are low, the cost of this data transfer will be a negligible portion of the user’s monthly phone contract.
The new paradigm will enable a range of additional services that today are just too expensive for widespread deployment
1. Introduction.
Wibree is a short range RF communication technology featuring ultra-low power consumption, a lightweight protocol stack and simple integration with Bluetooth. Wibree radio technology complements other local connectivity technologies, consuming only a fraction of the power compared to other such radio technologies, enabling smaller and less costly implementations and being easy to integrate with Bluetooth solutions. Wibree is a machine-to-machine protocol. Sensor to handset and handset to server might bee a more illustrative way to explain its value. Wibree is the first open technology offering connectivity between mobile devices or Personal Computers, and small, button cell battery power devices such as watches, wireless keyboards, toys and sports sensors. By extending the role mobile devices can play in consumers’ lives, this technology increases the growth potential in these market segment.
Wibree is complementary to existing technologies. It does not replace them; rather it's intended to operate side-by-side with the existing protocol, offering dual-mode functionality depending on the need.Wibree, also called "Baby Bluetooth," is a low-power wireless local area network (WLAN) technology that facilitates interoperability among mobile and portable consumer devices such as pagers, personal digital assistants (PDAs), wireless computer peripherals, entertainment devices and medical equipment..
2. Wibree.
Wibree is a short range RF communication technology (intended to become an open standard of wirelesscommunications) designed for ultra low power consumption (button cell batteries) within a short range (10 meters / 30 feet) based around low-cost transceiver microchips in each device.The short answer is, it's an extension to Bluetooth, one that extends the capabilities of the Bluetooth protocol to better enable low-power uses and to better process data intermittently, rather than continuously. The name for the new low-power wireless standard called wibree is an amalgam of "Wi," for "wireless," and "bree," from an Old English word for "crossroads," or a place where two things come together. This technology was announced on 2006-10-03 by nokia
3.What Wibree does?
Wibree’s main application is to provide an ultra low power radio within the 2.4GHz band. Low power is always determined in large part by the application – the longer a device is active, and the more data it transmits, the shorter its battery life will be. Wibree is aiming to produce a radio that can transmit a small packet of data approximately every second for a year using a small button cell, such as a CR2430, with a capacity of around 280mAH.If the duty cycle is reduced to one transmission every 15 to 30 seconds, then the battery life effectively becomes the leakage life of the battery. 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. The receiving device, which is likely to contain a larger battery as it will be on for more of the time, will acknowledge the message and tell the first device which channel to send its data on. It will then acknowledge receipt of this data, at which point both can go back to sleep. The whole process will take less than three or four milliseconds
4. Wibree device architecture.
Wibree specifications have been created by having two types of Wibree implementations – one based on the Wibree stand-alone chip, and another based on the Wibree-Bluetooth dual-mode chip - which will serve different purposes and be installed on different devices. Stand-alone Wibree chips would be implemented in small, low cost devices such as wireless mouse and keyboards, sport sensors, watches and toys. The Wibree-Bluetooth dual-mode chips would probably be implemented in future mobile phones, allowing users to benefit from both worlds – Bluetooth 2.0 high speed and Wibree's low power and extended ability to communicate with a new generation of smaller wireless devices. Wibree technology is up to ten times more efficient than Bluetooth and have an output power around -6dbm.
4.1 Examples.
Figure .1 Dual mode implementation
Figure . 2 stand alone implementation
5. Wibree link layer specification.
Wibree link layer provides ultra low power idle mode operation, simple device discovery and reliable point-to-multipoint data transfer with advanced power-save and encryption functionalities. The link layer provides means to schedule Wibree traffic in between Bluetooth transmission.