Method and apparatus for calculating a device location

Details Method and apparatus for calculating a device location Method and apparatus for calculating a device location

2006-07-31

2009-11-10

Appiah, Charles N (Department: 2617)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S446000, C375S141000

Reexamination Certificate

active

07616965

ABSTRACT:
A method and apparatus for calculating a location of a device is provided. A likelihood of the device being located at a particular location point or a particular location floor is determined using a likelihood calculation at each of a plurality of locations. The location point or location floor is then identified as that location having an associated highest likelihood calculation. The likelihood calculation includes calculating a distance from the device to each of a plurality of reference routers including one or more virtual coplanar reference routers, wherein each of the one or more virtual coplanar reference routers comprise a projection of a non-coplanar reference router onto the floor.

REFERENCES:
patent: 6799047 (2004-09-01), Bahl et al.
patent: 7203497 (2007-04-01), Belcea
patent: 2004/0180665 (2004-09-01), Slawitschka et al.
patent: 2006/0194588 (2006-08-01), Zhao

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