Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1997-08-15
2000-04-18
Chin, Wellington
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455466, 342367, 342450, H04Q 722
Patent
active
060525975
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method and to a system for determining the position or location of a mobile station in a cellular mobile telecommunications system. In a preferred method and apparatus embodiment, the invention relates to a method and to a system of apparatus for localizing vehicles equipped with mobile stations by updating their position in a cellular GSM mobile telecommunications system, either at frequent-intervals or instantaneously.
DESCRIPTION OF THE BACKGROUND ART
Existing positioning functions are based, among other things, on the use of the GPS system (Global Positioning System). GPS is an accurate position-determining satellite system. The system uses many satellites, where a receiver receives signals from several channels and from different satellites. The receiver determines the mutual phase position between direct sequences received from different satellites and calculates their positions in three coordinates from an equation system.
Positioning systems based on the GPS system also exist. The positioning information is transmitted with the aid of GSM technology (Global System for Mobile communication) or with the aid of some other cellular telecommunications technique (Mobitexe). This requires firstly capacity utilization in the GSM technique for short message services (SMS), and secondly it incurs costs in the GSM system and costs in the GPS system.
SUMMARY OF THE INVENTION
The invention is intended to provide in cellular mobile telecommunications system a method and a system for establishing the geographical position or location of a mobile station in the system, either with regard to time or distance. In a particular embodiment, the mobile station accompanies a vehicle, wherein the geographical position of the vehicle can be presented on a graphic screen for subscriber information.
In one embodiment of the method of determining the position of a mobile station in a cellular mobile telecommunications system in accordance with the invention, the mobile telecommunications system sets up a simulated call connection generated by a position handler. The position handler contains mobile station categories and stations intended for simulated call connection, said connection being released after the system has sent a paging message to a mobile station and when a reply to the paging message has been received from the mobile station. This response is used to determine the cell in which the mobile station is located, via the identity of the cell. The timing advance (TA) of a mobile station can be used together with the cell identity to obtain more accurate positioning of a mobile station in the cell. The position handler converts at least one of the parameters cell identity and timing advance (TA) to establish the geographic position of the mobile station.
In one embodiment, the position handler includes the register HLR in GSM for categorizing mobile stations intended for simulated call connection. Position handlers are comprised of the means that are provided in a telephone services switching centre or an exchange for establishing call connections and are used to generate and analyze simulated call connections and call releases.
In a further embodiment, the position handler includes an administrative means having a register for categorizing mobile stations that are intended for simulated call connections, and at least one call generator for generating and analyzing call connections and call releases respectively.
At least one of the parameters cell identity and timing advance (TA) are processed so as to be converted continuously to give the longitude and latitude of the mobile stations paged via the position handler, after each simulated call connection. A graphic presentation of the location of a given mobile station is transmitted to the subscriber requesting the simulated call connection, the position or location of the mobile station being subsequently updated for presentation. The subscriber requesting the call connection is also given the possibility of
REFERENCES:
patent: 5794142 (1998-08-01), Vantilla et al.
patent: 5901358 (1999-05-01), Petty et al.
Chin Wellington
Europolitan AB
Sobutka Philip J.
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