Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2007-05-29
2007-05-29
Zewdu, Meless (Department: 2617)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S456200, C455S456300, C455S466000, C455S404200
Reexamination Certificate
active
10344857
ABSTRACT:
An asset positioning method and system (700) rapidly and accurately determine the special location of wireless nodes distributed in three-dimensional space. Furthermore, as a by-product, every node also determines the relative offset and drift of every other node's clock, so that it is possible for all nodes to carry out a precise synchronized action (708). The positioning and synchronization protocol has significant implications for a broad range of wireless networking infrastructure and applications. For instance, the rapid availability of accurate location information greatly simplifies and optimises the implementation of ad-hoc networks and sensor-based applications (716). Additionally, the synchronized node operations facilitate the development of new applications, such as phase-locked arrays, in which several low power transmitters coordinate to form a powerful group transmitter. Since the positioning protocol yields rapid responses and positional accuracy in the range of a few centimeters, the positioning protocol permits mobile nodes to be tracked while they are moving.
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International Search report for International Application No. PCT/US01/25381, International Filing Date: Aug. 5, 2001.
Agrawala Ashok Kumar
Larsen Ronald L
Shankar A. Udaya
Szajda Douglas C
Sterne Kessler Goldstein & Fox P.L.L.C.
University of Maryland College Park
Zewdu Meless
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