Process for locating mobile stations in a cellular mobile radio network and mobile radio network for carrying out the process

Patent 5809424 Issued on September 15, 1998. Estimated Expiration Date:

December 26, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Vehicle location system
Patent #: 4891650
Issued on: 01/02/1990
Inventor: Sheffer

Multi-exchange paging system for locating a mobile telephone in a wide area telephone network
Patent #: 5153902
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System for locating and communicating with mobile vehicles
Patent #: 5432841
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Inventor: Rimer

Person location system Patent #: 5513243
Issued on: 04/30/1996
Inventor: Kage

Inventor

Eizenhoefer, Alfons

Assignee

Daimler-Benz Aerospace AG

Application

No. 569241 filed on 12/26/1995

US Classes:

455/456.2, Based on request signal342/450Position indicating (e.g., triangulation)

Examiners

Primary: Bost, Dwayne D.
Assistant: Wyche, Myron K.

Attorney, Agent or Firm

Spencer & Frank

Foreign Patent References

0335558 EP. 10/13/1989

International Class

H04Q 007/22

Foreign Application Priority Data

1993-06-26 DE

Abstract

A process for locating mobile stations in a cellular mobile radio network with several spatially distributed fixed base stations associated each to several cells and several mobile stations. The network has storage devices which contain information about the identify of the mobile stations and about the cells in which the individual mobile stations were last signaled. In order to locate a mobile station in as flexible as possible a manner, but also if required as precisely as possible, the information in the storage devices is used for approximately locating the searched-for mobile station and at least one direction finding is carried out in order to more precisely locate the mobile station. A cellular mobile radio network for carrying out this process is characterized in that the individual stations are each in communication with a direction finder and that the mobile radio network has a locating central office in communication with all direction finders.

Other References

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