Location based services in smartphones
KeywordsΚινητά συστήματα επικοινωνίας ; Έξυπνο τηλέφωνο ; Αποτυπώματα Wi-Fi ; Αισθητήρες ; Υπηρεσίες αξιοποίησης της γεωγραφικής θέσης σε κλειστούς χώρους ; Smartphones ; Cloud computing services ; Wi-Fi ; Fingerprinting ; Sensor ; Indoor location based services
Mobile computing evolves constantly and quickly. Every day, new mobile devices, technologies, methods and applications are introduced. Recently, location-based service (LBS), a mobile application, became the centre of attention. Such a service is based on the geographical position of a mobile device (for example, a mobile phone and particularly a smartphone). Even though location-based services are quite popular, most developers don’t seem to be familiar with its design and implementation. LBS services prevail in the everyday life of people. Navigation, logistics, points of interest (POI), and others, are all types of LBS services. These services should be available in every place, even in indoor areas, such as buildings, subway stations, underground shopping malls, centres of big cities, etc. LBS services which are located inside of buildings are usually called Indoor Location Based Services or ILBS. This dissertation deals with the comprehension of LBS services and is divided into four chapters. In the first chapter, there is an introduction to LBS services (about their characteristics, structure, architectures, etc.) and there is a reference of their relationship with Geographic Information Systems (GIS). The second chapter describes the technologies and applications of LBS services and gives information about the security of user’s personal data. Continuing the structure of the research, there is a reference to indoor and outdoor systems of LBS. Finally, there is a presentation of recent researches which are based on the different technologies and algorithms used for the improvement of Location Based Services.