Patent ID: 7831283
Filing Date: 2010-11-09
Classification: H04W,Y02D

Abstract:
1. A sensor network system comprising: a server having a storage unit holding data addressed to a sensor node, and a transceiver which performs data transmission and reception to and from a base station; an intermediate device connected to said server and connected to said sensor node by wireless; and a sensor terminal connected to said intermediate device via a transceiver, said sensor terminal being to perform an intermittent operation repeating an operating period when power is supplied to a processor, and a first sleep period when power is not supplied, wherein, in case that said server stores continuous plural data in a storage unit, said server transmits a plural-data transmit start message via said transceiver, and said sensor terminal which received said plural-data transmit start message via said intermediate device, changes over to a second sleep period which is shorter than said first sleep period, and performs a polling to said intermediate device after the sleep of said second sleep period, wherein, in case that said server receives said polling via said intermediate device from said sensor terminal, said server sends out said plural data via said transmitter sequentially, when said server completes transmission of said plural data, said server transmits a plural-data transmit end message, and said sensor terminal which received said plural-data transmit end message then changes over the second sleep period to the first sleep period.