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Signal Collecting Platform and "Handprint" Positioning System
KTH, Skolan för informations- och kommunikationsteknik (ICT).
2015 (engelsk)Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
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%.

sted, utgiver, år, opplag, sider
2015. , s. 56
Serie
TRITA-ICT-EX ; 2015:260
Emneord [en]
crowdsourcing, positioning, cellular network, short range communication
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-210818OAI: oai:DiVA.org:kth-210818DiVA, id: diva2:1120307
Eksternt samarbeid
Aalto University
Fag / kurs
Communications Systems
Utdanningsprogram
Master of Science -Security and Mobile Computing
Examiner
Tilgjengelig fra: 2017-07-06 Laget: 2017-07-06 Sist oppdatert: 2017-07-06bibliografisk kontrollert

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