Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Mobile data retrieval improved with new algorithm

19.06.2006
Penn State researchers have developed a new algorithm which enables cell-phone users to fetch data from music to TV shows as quickly as feasible with minimal channel switches.

With the computing technique, mobile devices can pick up data that may have been "missed" when first broadcast, thereby alleviating the wait for subsequent broadcast cycles. Because it minimizes channel switching, the new algorithm also reduces power use, thereby extending battery life.

"Currently, mobile devices retrieve broadcast data similar to how TV viewers watch TV shows simultaneously broadcast-by switching channels," said Prasenjit Mitra, assistant professor in the College of Information Sciences and Technology (IST)."But with our algorithm, cell-phone users don't have to wait for fewer broadcast cycles to retrieve the data as the mobile device can pick up objects broadcast across parallel air channels."

The technique is described in a paper, "Efficient Object Retrieval from Parallel Air Channels in the Presence of Replicated Objects," that appears in the proceedings of the Seventh International Conference on Mobile Data Management, held in Japan in May. The other authors are Padmapriya Ayyagari, an IST graduate student, and Ali Hurson, a professor of computer science.

According to the researchers, data dissemination for mobile devices now occurs through one of two techniques: unicast, which is common when data is sent to a single person, and broadcast, when data is sent to multiple people over parallel air channels. Broadcast is more common when the same content such as emergency alerts, weather information or television shows reaches multiple people.

But the algorithm currently used can't take advantage of data that is broadcast repeatedly on different channels. Instead the data has to be broadcast in cycles. This is both time and power consuming.

"If you can retrieve all the data you want in fewer broadcast cycles, then the user saves on time and battery power," Mitra said. "The power-consumption reduction is achieved because the technique fetches all the objects requested by a client while minimizing the number of channel switches required."

As part of their study, the researchers developed and compared the performance of the four kinds of algorithms-greedy, random, branch-and-bound and select first-that could be used to improve object retrieval and reduce power consumption. Of these, the researchers' greedy algorithms created an efficient and quick solution to object retrieval that also decreased battery drain.

The researchers are continuing to explore algorithms for mobile data retrieval and anticipate developing additional ones that will even further reduce power consumption and time, Mitra said.

Margaret Hopkins | EurekAlert!
Further information:
http://www.ist.psu.edu

More articles from Communications Media:

nachricht New Technologies for A/V Analysis and Search
13.04.2017 | Fraunhofer-Institut für Digitale Medientechnologie IDMT

nachricht On patrol in social networks
25.01.2017 | Fraunhofer-Institut für Arbeitswirtschaft und Organisation IAO

All articles from Communications Media >>>

The most recent press releases about innovation >>>

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

Im Focus: Carbon Nanotubes Turn Electrical Current into Light-emitting Quasi-particles

Strong light-matter coupling in these semiconducting tubes may hold the key to electrically pumped lasers

Light-matter quasi-particles can be generated electrically in semiconducting carbon nanotubes. Material scientists and physicists from Heidelberg University...

Im Focus: Flexible proximity sensor creates smart surfaces

Fraunhofer IPA has developed a proximity sensor made from silicone and carbon nanotubes (CNT) which detects objects and determines their position. The materials and printing process used mean that the sensor is extremely flexible, economical and can be used for large surfaces. Industry and research partners can use and further develop this innovation straight away.

At first glance, the proximity sensor appears to be nothing special: a thin, elastic layer of silicone onto which black square surfaces are printed, but these...

Im Focus: 3-D scanning with water

3-D shape acquisition using water displacement as the shape sensor for the reconstruction of complex objects

A global team of computer scientists and engineers have developed an innovative technique that more completely reconstructs challenging 3D objects. An ancient...

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...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Clash of Realities 2017: Registration now open. International Conference at TH Köln

26.07.2017 | 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

 
Latest News

CCNY physicists master unexplored electron property

26.07.2017 | Physics and Astronomy

Molecular microscopy illuminates molecular motor motion

26.07.2017 | Life Sciences

Large-Mouthed Fish Was Top Predator After Mass Extinction

26.07.2017 | Earth Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>