Patent ID: 8073420
Filing Date: 2011-12-06
Classification: H04L

Abstract:
1. A sensor node device for implementation within a sensor network which includes plurality of sensor node devices capable of being connected to a base station, the sensor node device comprising: a sensor unit for performing observation; a communication unit for sending sensor data serving as a result of the observation to the base station; a counter unit which is synchronized with a counter unit of the base station; and a controller, and wherein the controller performs control such that a counter value of the counter unit of the sensor node device is used to perform activation at an observation timing determined based on an observation interval and a start timing which are notified by the base station, wherein the observation is performed using the sensor unit, wherein sensor data, serving as a result of the observation, is sent from the communication unit to the base station, wherein the plurality of sensor node devices within the sensor network are grouped based on a requested observation granularity, and wherein the observation interval and the start timing are determined based on a requested observation interval for each group of sensor node devices and a quantity of sensor node devices included in each group.