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Signal Collecting Platform and "Handprint" Positioning System
KTH, School of Information and Communication Technology (ICT).
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Mobile computing is an emerging research field in recent years. Although the computation capability of main stream smartphones are several orders of magnitude better than computers twenty years ago, the capacity of battery does not increase at same speed. To save energy, some recent work tries to schedule network traffic according to signal strength variations. To achieve this goal, a database that is used for storing signal strength distribution is essential.We first design and implement a platform to collect cellular network information, including Cell-ID and signal strength information. The platform is designed as a distributed system that supports collecting signal strength data by using crowdsourcing approach.We then deploy the platform and collect signal strength information in Otaniemi area (Finland). After analysing the collected data, we observe several interesting phenomenons. (1) the density of base stations is out of expectation; (2) cells is becoming smaller; (3) in most places a device may connect to different base stations. Based on these observations, we design a new energy-efficient positioning system called “handprint”, which utilises signal strength information from neighbouring smartphones to assist positioning. Compared with Google Geolocation API and other existing work, our “handprint” system can improve positioning accuracy by more than 20%.

Place, publisher, year, edition, pages
2015. , 56 p.
Series
TRITA-ICT-EX, 2015:260
Keyword [en]
crowdsourcing, positioning, cellular network, short range communication
National Category
Communication Systems
Identifiers
URN: urn:nbn:se:kth:diva-210818OAI: oai:DiVA.org:kth-210818DiVA: diva2:1120307
External cooperation
Aalto University
Subject / course
Communications Systems
Educational program
Master of Science -Security and Mobile Computing
Examiners
Available from: 2017-07-06 Created: 2017-07-06 Last updated: 2017-07-06Bibliographically approved

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CiteExportLink to record
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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf