Communications: electrical – Selective – Interrogation response
Reexamination Certificate
2008-04-16
2009-06-02
Zimmerman, Brian A. (Department: 2612)
Communications: electrical
Selective
Interrogation response
C340S539130, C340S539100, C340S572100, C340S003600, C340S005920, C340S005730, C340S870030, C235S384000, C235S385000, C342S357490, C342S357490, C342S357490
Reexamination Certificate
active
07541913
ABSTRACT:
A method for tracking a plurality of containers each joined to an electronic tracking device having routing capabilities and a WPAN-enabled radio receiver/transmitter configured to attempt to connect to a pre-configured WPAN upon being activated comprises activating the radio receiver/transmitter of each tracking device joined to a container being loaded onto a cargo vessel; receiving an indication from each tracking device that fails to connect to the WPAN; intermittently performing a network scan to locate each WPAN-connected tracking device; intermittently configuring the WPAN to include each WPAN-connected tracking device in a hybrid tree-mesh network topology; intermittently configuring routing information stored on each WPAN-connected tracking device to maintain mutual communication with each WPAN-connected tracking device and enable mutual communication between each WPAN-connected tracking device; receiving transport-related data from each WPAN-connected tracking device; transmitting the transport-related data to a control station through a LAN on the vessel; broadcasting a request to be routed between the WPAN-connected tracking devices in a depth-first traversal of the network topology that directs each WPAN-connected tracking device to enter a low-power mode when the depth-first traversal backtracks from the tracking device; and receiving an acknowledgment of the request communicated from each WPAN-connected tracking device when the tracking device enters the low-power mode.
REFERENCES:
patent: 6972682 (2005-12-01), Lareau et al.
patent: 7221750 (2007-05-01), Brahmbhatt et al.
patent: 2004/0203377 (2004-10-01), Eaton et al.
Kamran Javed, ZigBee Suitability for Wireless Sensor Networks in Logistic Telemetry Applications, Hamsted University; School of Information Science, Computer, and Electrical Engineering, Jan. 2006.
Binding Carl
Dolivo Francois B.
Hermann Reto J.
Husemann Dirk
Schade Andreas
Brown Vernal U
Cantor & Colburn LLP
International Business Machines - Corporation
Klett Peter
Zimmerman Brian A.
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