Abstract
Formation technology of Bluetooth scatternet has been researched for over a decade and promoted by rapid development of wearable computing. Limited by technical features, the traditional scatternet formation technology has not been widely used in real commercial chipsets. As new features are introduced into the Bluetooth core field, the ability to use Bluetooth Low Energy (BLE) technology to construct a network becomes the reality and puts forward new challenges. The scatternet formation technology facing to BLE and wearable devices requires significant improvement in energy efficiency. According to our experiments, 92% of the system energy consumption can be attributed to central nodes. In this paper, we presented a Bluetooth scatternet formation technology focused on energy efficiency, GreenLink, which minimizes the amount of central nodes by enhancing system aggregation degree to ensure excellent energy-saving performance. Meanwhile, we implemented a prototype of GreenLink on Nordic nRF51822 chipsets, conducted experiments, and verified in practice. According to the experiments, GreenLink used only 30% central nodes and reduced 50% system energy consumption compared with traditional technology.
Highlights
Since its appearance in the 1990s, Bluetooth has become a widely used technology for short-range communication
With an explosive growth of smart home and wearable computing, lots of smart devices such as smart lights, smart switches, smart watches, and smart scales are based on Bluetooth because of its simplicity, energy efficiency, and low cost
Energy efficiency is the essential issue which needs to be significantly improved for the existing scatternet formation technology before they can be used
Summary
Since its appearance in the 1990s, Bluetooth has become a widely used technology for short-range communication. With an explosive growth of smart home and wearable computing, lots of smart devices such as smart lights, smart switches, smart watches, and smart scales are based on Bluetooth because of its simplicity, energy efficiency, and low cost. The short transmission range and low ability to cross over obstacles still limit the wider use of Bluetooth in smart home scenarios. You may fail to control your lamps in the bedroom from your living room because it is out of the control range. You have to use your smart scale with holding your smartphone so that the application can record your weight through the Bluetooth link. Multihop transmission is unavailable between Bluetooth nodes, which has limited many features and use cases
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