Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2003-10-06
2008-08-12
Beamer, Temica M (Department: 2617)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S067110, C455S226200
Reexamination Certificate
active
07412246
ABSTRACT:
Mobile units within an area are located using a wireless local area network. Reference signal transmitters are provided at selected fixed locations within the area. Reference signals are transmitted using the reference signal transmitters using a first selected channel of the wireless local area network. A computer is provided having a database relating signal characteristics of signals transmitted by the reference signal transmitters to location within the area At least one access point is coupled to the computer and provides wireless data communications between the computer and the mobile unit using one or more channels of the wireless data communications system that are different from the first data communications channel. A selected plurality of the reference signals are received at the mobile unit, signal characteristics of the received reference signals are determined and data representing the received reference signal characteristics is transmitted to the computer via the access point using the one or more data communications channels. The data representing reference signal characteristics is received at the computer and position of the mobile unit is determined using the database.
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Barr Russell A.
Lewis Thomas P.
Beamer Temica M
Fay Kaplun & Marcin LLP
Symbol Technologies Inc.
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