Locating users in wireless and mobile networks

OData support
Dr. Szabó Sándor
Department of Networked Systems and Services

Nowadays, mobile phones known as smartphones have advanced to such a high level that through their proliferation several mobile service became available for the users. Among the above mentioned services, location-based services deserve favoured position, which are able to provide further value-added services using the appliance’s position.

Positioning might happen trough the well-known GPS technology which is counted among the most widely used positioning solutions, although depending on the environmental conditions it provides limited usability. Cells principal deriving from the structure of the GSM/UMTS mobile network is qualified for compensating the above mentioned drawbacks, which is able to offer positioning information independently of environmental conditions. Cells principal is true to most of the surface mobile telecommunication systems, in other words it means that they are located in clusters where to each cells belong an individual identification code. Basically, if both the longitudinal and the latitude coordinate belonging to the cell identification code, are known, our position can be fixed, being either under the ground travelling by tube or inside an enclosed building. Accordingly, I have aimed at the elaboration of such a positioning system, which alloys the advantages of the above mentioned two methods.

Through some applications, I have stated some potential business opportunity implied in the location-based services, pointing at the idle areas on this field.

In my thesis, after becoming acquainted with the theoretical background of the above methods, I have worked out the algorithms necessary to map the cells, both in enclosed and open space, since the location of these mobile cells are in the future too held in secret by the telecommunication companies. The client-server based follow-up system prepared by me accomplishes the combination of the satellite and the cell based positioning, which for the time being is available on the client devices running Android. Examining the barriers of the system I have outlined the possibilities of its further development and I have suggested potential solutions.


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