Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1995-12-26
1998-09-15
Bost, Dwayne D.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
342450, H04Q 722
Patent
active
058094245
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO THE RELATED APPLICATION
This application is a National Stage Application under 35 U.S.C. .sctn. 371 of PCT/EP 94/01977.
BACKGROUND OF THE INVENTION
The invention relates to a process for locating mobile stations in a cellular mobile radio network having a plurality of spatially distributed fixed base stations, each assigned to one or more cells, and at least one mobile station, which network has at least one memory device that receives information about the identity of the at least one mobile station and about the cell or cell group in which the at least one mobile station was most recently reported. The invention additionally relates to a cellular mobile radio network for carrying out the process, with the radio network having a plurality of spatially distributed, fixed base stations each assigned to one or more cells, and at least one mobile station, as well as at least one memory device which includes information about the identity of the at least one mobile station and about the cell or the cell group in which the at least one mobile station was most recently reported. One such process and mobile radio network are already known from H. Hamalek, K. Kammerlander: "Grundlagen und Praxis der Funkzellengestaltung mit of Cellular Radio Design with Relative Distance Measurement in the C Network of the Federal German Postal Service! in NTG-Fachberichte Bewegliche Funkdienste, Vol. 90, pp. 157-164.
Determining the location of mobile stations in radio networks is desirable for a number of applications. Examples are emergency calls or transporting of securities and hazardous goods, but also the monitoring of vehicle fleets, for example freight-hauling trucks or car rental agencies.
In principle, in the process for locating mobile stations in a cellular mobile radio network, a distinction can be made between active-subscriber and passive-subscriber processes; the passive-subscriber processes can be further subdivided into two classes.
In the active-subscriber processes, the subscriber finds his location on his own. To that end, radio navigation methods (GPS (Global Positioning System), Decca), compass methods and path pickups ("dead reckoning") or other aids can be used. The subscriber, or his set, that is, the radio station, reports the current location to a central station over the mobile radio network. This is done either automatically by the mobile station or after interrogation ("polling") by the central station. In the passive-subscriber process with mobile station supports, the subscriber or the mobile station in the network reports in and explicitly or implicitly (as in an emergency call, for instance) requests that the location of the mobile station be determined by the mobile radio network. The mobile radio network then carries out the location determination, or location finding. The subscriber report makes the location finding considerably easier, because triggering for the measurement and the search for the subscriber in the network are then unnecessary. In the passive-subscriber process without mobile station support, the mobile radio network first ascertains the approximate location of the subscriber (such as the cell), and then carries out a precise location finding without any contribution by the subscriber. The passive-subscriber processes without mobile station support are the most technically complicated processes. If a passive-subscriber process is achieved without mobile station support, then a passive-subscriber process with mobile station support can easily be derived from it.
For synchronous public mobile radio networks (PLMN=Public Land Mobile Network), passive-subscriber processes have already been proposed for locating mobile stations.
For instance, in the article by H. Hamalek and K. Kammerlander referred to at the outset, a locating process for the C network (operating on an analog basis) of the Federal German Postal Service, is described, by which the mobile station can determine the relative distance by measuring the time difference between the reception signal
REFERENCES:
patent: 4891650 (1990-01-01), Sheffer
patent: 5153902 (1992-10-01), Buhl et al.
patent: 5327144 (1994-07-01), Stilp et al.
patent: 5408683 (1995-04-01), Ablay et al.
patent: 5432841 (1995-07-01), Rimer
patent: 5513243 (1996-04-01), Kage
G. Brody et al.: "Subscriber Tracking and Locating In Personal Communications Networks". In: International Switching Symposium 1992, vol. 1, Oct. 25, 1992, Yokohama, JP, pp. 307-311.
S. Sakagami et al.: "Vehicle Position Estimates by Multibeam Antennas in Multipath Environments". In: IEEE Transactions on Vehicular Technology, vol. 41, No. 1, Feb. 1992, New York, pp. 63-67.
Wickman et al.: "Localisation Associee au Systeme GSM". In: Navigation. Revu Technique de Navigation Maritime, Aerienne, Spatiale et Terrestre, vol. 39, No. 153, Jan. 1991, Paris, FR, pp. 13-21.
H. Halamek et al.: "Grundlagen und Praxis der Funkzellengestaltung mit Relativer Entfernungsmessung im Netz C der DBP". In: NTG-Fachberichte Bewegliche Funkdienste, vol. 90, pp. 157-164.
H. Ochsner: "Das zukuenftige paneuropaeische digitale Mobiltelefonsystem", Part 1, GSM-Empfehlungen und Dienste, Bulletin SEV/VSE 79, (1988) 11, pp. 603-608.
H. Ochsner: "Das zukuenftige paneuropaeische digitale Mobiltelefonsystem", Part 2, Die Funkstrecke, Bulletin ASE/UCS 79 (1988) 15, pp. 937-942.
H. Ochsner: "Das zukuenftige paneuropaeische digitale Mobiltelefonsystem", Part 3, Digitalisierung der Sprache und Netzwerkaspekte, Bulletin ASE/UCS 79 (1988) 21, pp. 1318-1324.
Bost Dwayne D.
Daimler-Benz Aerospace AG
Wyche Myron K.
LandOfFree
Process for locating mobile stations in a cellular mobile radio does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for locating mobile stations in a cellular mobile radio , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for locating mobile stations in a cellular mobile radio will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-103768