Multiplex communications – Communication over free space – Combining or distributing information via time channels
Reexamination Certificate
2007-01-09
2010-10-19
Chang, Kent (Department: 2617)
Multiplex communications
Communication over free space
Combining or distributing information via time channels
C340S664000
Reexamination Certificate
active
07817616
ABSTRACT:
A time synchronization method in a wireless sensor network, has an upper node that provides back-off scheduling to lower nodes in the wireless sensor network of a hierarchical structure. Each of the lower nodes synchronizes time according to the back-off scheduling based on its local clock. The time synchronous method also allows the number of packets required for synchronization in the wireless sensor network to sharply decrease, and the life time of the network to increase. Additionally, the time synchronous method provides a response packet from a lower node in response to a synchronization packet from an upper node, which is used as a synchronization start packet for secondary lower nodes, so that synchronization in the entire network is rapidly processed.
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Jeong Min-seop
Kim Dae-young
Kim Hyunhak
Kim Min-Q
Park Jong-hun
Chang Kent
Nguyen Dinh P
Samsung Electronics Co,. Ltd.
Sughrue & Mion, PLLC
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