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In-building Location Sensing Based on WLAN Signal Strength: Realizing a Presence User Agent
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS. (CCSlab)
2008 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Exploiting context-aware environments, where sensors scattered in a environment update presence servers to indicate the environmental changes can be used to enable new services. Such systems have become feasible both in terms of technical di±culties and their cost. A current focus in this area of research is how a context-aware system should be designed so that it reduces both the cost and complexity of the infrastructure, but still provides the desired services. One of the key components of many context-aware systems is location sensing, because a user's location is one of the most used elements of information in context-aware services. In this paper, we address cost e®ective location services by utilizing measurements of WLAN signal strength. We derive from these measurements an estimate of a device's location, and make this location information available via a SIP Presence User Agent, thus making location information readily available to services that might wish to use this information - while hiding details of how this information is acquired from these services.

Abstract [sv]

Genom att utnyttja kontextmedvetna miljöer, där sensorer i en miljö uppdaterar närvarande servrar med information omändringar i omgivningen, så kan man öppna upp vägar för nya tjänster. Sådana system har blivit utförbara bade när det gäller tekniska svarigheter och deras kostnader. Inom forskning som rör sådana här system ägnas mycket uppmärksamhetåt hur en kontextmedveten miljö borde designas för att minimera både kostnaden och komplexiteten av infrastrukturen, men fortfarande tillhandahålla den önskade tjänsten. En av huvudkomponenterna i många kontextmedvetna system är platsuppfattning, eftersom en användares position är en av de mest använda elementen av information i kontextmedvetna tjänster. I den här uppsatsen ägnar vi oss åt kostnadseffektiva platstjänster genom att mäta signalstyrkan av ett WLAN. Genom dessa mätningar uppskattar vi en enhets position och gör denna information tillgänglig via en SIP Presence User Agent, och gör på så vis platsinformationen tillgänglig för tjänster som kan vilja ha den { utan att avslöja detaljer om hur informationen har skaffats.

Place, publisher, year, edition, pages
2008. , 72 p.
Series
Trita-ICT-COS, ISSN 1653-6347 ; COS/CCS 2008-04
Keyword [en]
Location Sensing, WLAN, SIP, SIMPLE, Presence User Agent, Context-aware Computing
National Category
Communication Systems
Identifiers
URN: urn:nbn:se:kth:diva-91868OAI: oai:DiVA.org:kth-91868DiVA: diva2:511454
Subject / course
Computer Communication
Educational program
Master of Science - Internetworking
Presentation
2008-03-14, Seminar room Grimeton, Isafjordsgatan 22, Kista, 13:00 (English)
Uppsok
Technology
Supervisors
Examiners
Available from: 2012-03-23 Created: 2012-03-21 Last updated: 2013-09-09Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
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