Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

New Software Alleviates Wireless Traffic

15.04.2013
The explosive popularity of wireless devices—from WiFi laptops to Bluetooth headsets to ZigBee sensor nodes—is increasingly clogging the airwaves, resulting in dropped calls, wasted bandwidth and botched connections.

New software being developed at the University of Michigan works like a stoplight to control the traffic and dramatically reduce interference.

The software, GapSense, lets these devices that can't normally talk to one another exchange simple stop and warning messages so their communications collide less often. GapSense creates a common language of energy pulses and gaps. The length of the gaps conveys the stop or warning message. Devices could send them at the start of a communication, or in between information packets to let other gadgets in the vicinity know about their plans.

"All these devices are supposed to perform their designated functions but they're using the same highway and fighting for space," said Kang Shin, the Kevin and Nancy O'Connor Professor of Computer Science at U-M. "Since they don't have a direct means of communicating with each other because they use different protocols, we thought, 'How can we coordinate them so that each can perform their functions while minimizing interference with the others?'"

The researchers tested GapSense and found that it could reduce interference by more than 88 percent on some networks with diverse devices. Shin and Xinyu Zhang, a former doctoral student in electrical engineering and computer science, will present the work April 18 at the IEEE International Conference on Computer Communications in Turin, Italy.

To get a sense of how many wireless devices exist today, in 2013, CTIA, the Wireless Association counted more than 321 million WiFi-enabled cell phones, laptops and tablets in the United States. That's more than one device per person, and it's just the items that use WiFi, the protocol that transmits big chunks of data over relatively long distances.

Bluetooth and ZigBee use the same wireless spectrum as WiFi, but they all speak different languages. Bluetooth, shorter range and less powerful, can connect headsets and keyboards to phones and computers, for example. ZigBee, the lowest powered of the group, links networks of small radios to automate home and building systems such as lighting, security alarms and thermostats. It's also found in hospitals, where it gathers medical data from patients.

All these devices are already equipped with the standard "carrier sense multiple access," or CSMA, protocol that programs them to listen for radio silence before they send their own transmissions. But often it doesn't work.

ZigBee takes 16 times longer than WiFi to gear up from its idle state to transmit information, so sometimes it might sound to WiFi that the coast is clear when a ZigBee packet is on its way out.

"The little guy might be talking, but big guy cannot hear it," Shin said. "So the little guy's communication will be destroyed."

That's just one of several potential problems GapSense can help remedy. The researchers tested the software in a simulated office environment. With moderate WiFi traffic, they detected a 45 percent collision rate between ZigBee and WiFi, and GapSense reduced that to 8 percent.

The software could also address the so-called "hidden terminal" problem. Newer WiFi standards allow for faster data rates on wider bandwidths than the standard 20 megahertz, but devices on different bandwidths can't hear one another's communications to avoid talking over them. GapSense could enable these devices on different standards to talk in turn. At moderate WiFi traffic, the researchers detected around 40 percent collision rate between wider- and narrower-bandwidth devices and GapSense reduced it to virtually zero.

GapSense could also reduce energy consumption of WiFi devices by 44 percent. It would accomplish this by allowing the WiFi receiver to operate at low clock rates. With the software, the faster-clocked WiFi transmitter could send a wake-up message to the slower-clocked receiver in time for it to synch and catch an information packet.

"The impact of GapSense is huge in my opinion," Shin said. "It could be the Tower of Babel for the increasingly diversified world of wireless devices."

The paper is titled "Gap Sense: Lightweight Coordination of Heterogeneous Wireless Devices." The work is funded by the National Science Foundation. The university is pursuing patent protection for the intellectual property and is seeking commercialization partners to help bring the technology to market.

Kang Shin: http://web.eecs.umich.edu/~kgshin

IEEE Infocom conference: http://infocom.di.unimi.it

Nicole Casal Moore | Newswise
Further information:
http://www.umich.edu

More articles from Information Technology:

nachricht Defining the backbone of future mobile internet access
21.07.2017 | IHP - Leibniz-Institut für innovative Mikroelektronik

nachricht Researchers create new technique for manipulating polarization of terahertz radiation
20.07.2017 | Brown University

All articles from Information Technology >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Manipulating Electron Spins Without Loss of Information

Physicists have developed a new technique that uses electrical voltages to control the electron spin on a chip. The newly-developed method provides protection from spin decay, meaning that the contained information can be maintained and transmitted over comparatively large distances, as has been demonstrated by a team from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute. The results have been published in Physical Review X.

For several years, researchers have been trying to use the spin of an electron to store and transmit information. The spin of each electron is always coupled...

Im Focus: The proton precisely weighted

What is the mass of a proton? Scientists from Germany and Japan successfully did an important step towards the most exact knowledge of this fundamental constant. By means of precision measurements on a single proton, they could improve the precision by a factor of three and also correct the existing value.

To determine the mass of a single proton still more accurate – a group of physicists led by Klaus Blaum and Sven Sturm of the Max Planck Institute for Nuclear...

Im Focus: On the way to a biological alternative

A bacterial enzyme enables reactions that open up alternatives to key industrial chemical processes

The research team of Prof. Dr. Oliver Einsle at the University of Freiburg's Institute of Biochemistry has long been exploring the functioning of nitrogenase....

Im Focus: The 1 trillion tonne iceberg

Larsen C Ice Shelf rift finally breaks through

A one trillion tonne iceberg - one of the biggest ever recorded -- has calved away from the Larsen C Ice Shelf in Antarctica, after a rift in the ice,...

Im Focus: Laser-cooled ions contribute to better understanding of friction

Physics supports biology: Researchers from PTB have developed a model system to investigate friction phenomena with atomic precision

Friction: what you want from car brakes, otherwise rather a nuisance. In any case, it is useful to know as precisely as possible how friction phenomena arise –...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Closing the Sustainability Circle: Protection of Food with Biobased Materials

21.07.2017 | Event News

»We are bringing Additive Manufacturing to SMEs«

19.07.2017 | Event News

The technology with a feel for feelings

12.07.2017 | Event News

 
Latest News

NASA looks to solar eclipse to help understand Earth's energy system

21.07.2017 | Earth Sciences

Stanford researchers develop a new type of soft, growing robot

21.07.2017 | Power and Electrical Engineering

Vortex photons from electrons in circular motion

21.07.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>