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 Supercomputing the emergence of material behavior
18.05.2018 | University of Texas at Austin, Texas Advanced Computing Center

nachricht Keeping a Close Eye on Ice Loss
18.05.2018 | Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung

All articles from Information Technology >>>

The most recent press releases about innovation >>>

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

Im Focus: LZH showcases laser material processing of tomorrow at the LASYS 2018

At the LASYS 2018, from June 5th to 7th, the Laser Zentrum Hannover e.V. (LZH) will be showcasing processes for the laser material processing of tomorrow in hall 4 at stand 4E75. With blown bomb shells the LZH will present first results of a research project on civil security.

At this year's LASYS, the LZH will exhibit light-based processes such as cutting, welding, ablation and structuring as well as additive manufacturing for...

Im Focus: Self-illuminating pixels for a new display generation

There are videos on the internet that can make one marvel at technology. For example, a smartphone is casually bent around the arm or a thin-film display is rolled in all directions and with almost every diameter. From the user's point of view, this looks fantastic. From a professional point of view, however, the question arises: Is that already possible?

At Display Week 2018, scientists from the Fraunhofer Institute for Applied Polymer Research IAP will be demonstrating today’s technological possibilities and...

Im Focus: Explanation for puzzling quantum oscillations has been found

So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics

Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...

Im Focus: Dozens of binaries from Milky Way's globular clusters could be detectable by LISA

Next-generation gravitational wave detector in space will complement LIGO on Earth

The historic first detection of gravitational waves from colliding black holes far outside our galaxy opened a new window to understanding the universe. A...

Im Focus: Entangled atoms shine in unison

A team led by Austrian experimental physicist Rainer Blatt has succeeded in characterizing the quantum entanglement of two spatially separated atoms by observing their light emission. This fundamental demonstration could lead to the development of highly sensitive optical gradiometers for the precise measurement of the gravitational field or the earth's magnetic field.

The age of quantum technology has long been heralded. Decades of research into the quantum world have led to the development of methods that make it possible...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Save the date: Forum European Neuroscience – 07-11 July 2018 in Berlin, Germany

02.05.2018 | Event News

Invitation to the upcoming "Current Topics in Bioinformatics: Big Data in Genomics and Medicine"

13.04.2018 | Event News

Unique scope of UV LED technologies and applications presented in Berlin: ICULTA-2018

12.04.2018 | Event News

 
Latest News

Achema 2018: New camera system monitors distillation and helps save energy

22.05.2018 | Trade Fair News

LZH showcases laser material processing of tomorrow at the LASYS 2018

22.05.2018 | Trade Fair News

Matabele ants: Travelling faster with detours

22.05.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>