Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Patent
1998-06-30
1999-10-19
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
G01S 302
Patent
active
059696796
ABSTRACT:
A method and apparatus for determining whether a wireless station is operating within a prescribed geographic location. During an initialization process, the wireless telephone measures propagation delays of pilot signals from nearby base stations and stores the propagation delays in a non-volatile memory of the wireless station. Thereafter, during a check process, the wireless station measures propagation delays of pilot signals from nearby base stations and compares them with the stored propagation delays stored in memory. If the difference between the two sets of propagation delays are within a predetermined tolerance, then a determination is made that the wireless station is operating within the prescribed geographic location. Multiple sets of propagation delays may be stored in memory such that a determination can be made as to whether the mobile station is operating within any one of a number of prescribed geographic locations.
REFERENCES:
patent: 5646632 (1997-07-01), Khan
Bolliger Brian David
Light Jeffrey Ross
Stockert Mark Kevin
Varvaro Charles
Drummond Devin
Lucent Technologies - Inc.
Tarcza Thomas H.
Weinick Jeffrey M.
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