The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 07, 2013
Filed:
Feb. 11, 2008
Takehiro Urano, Hachioji, JP;
Keiro Muro, Koganei, JP;
Toshiyuki Odaka, Fuchu, JP;
Minoru Ogushi, Kodaira, JP;
Yoshihiro Wakisaka, Kunitachi, JP;
Takehiro Urano, Hachioji, JP;
Keiro Muro, Koganei, JP;
Toshiyuki Odaka, Fuchu, JP;
Minoru Ogushi, Kodaira, JP;
Yoshihiro Wakisaka, Kunitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A sensor-Net system includes sensor nodes which are in intermittent operation so as to save power by repeating activated state and inactivated state at a regular interval. Synchronization of time in the system is executed by aligning to the intermittent operation of the sensor nodes. A management server issues a setTime command for configuring the time to each gateway node at a specified interval. Each router node sets or corrects the time of it based on the time received from the gateway node and thereafter turns ON the time configuration flag for each sensor node in order to expand the setTime command to all of its sibling sensor nodes. The router node, upon reception of a polling, which is a command request, from the sensor node, obtains the time at that time, then uses the time to generate a setTime command to transmit to that sensor node.