| Summary: | 碩士 === 玄奘大學 === 資訊科學學系碩士班 === 95 === Wireless sensor networks are composed of dispersive sensor nodes which can be used for environmental surveillance, data collection and transmission, and etc. Since sensor nodes are equipped with limited battery power, how to prolong the lifetime of sensor nodes becomes an important issue.
GRAB (GRAdient Broadcast protocol) is an excellent data delivery protocol for sensor networks. By using the budget mechanism, GRAB can enhance the data transmission robustness, and achieve high data delivery rate. However, power saving is not a main issue for GRAB, the GRAB keeps a node in idle listening state while it does not participate in any data transmission task.
In this thesis, we make some modifications for the GRAB protocol to achieve the power saving goal. In our proposed protocol, all the nodes are initiated in the sleeping mode, they can be waken up either by their own sensing device when some events are detected, or by receiving the wake-up beacons sent by neighboring nodes. For the sensor nodes are only waken up on-demand, significant energy saving can be accomplished. As the simulation results shown, our proposed protocol consumes much fewer energy than GRAB does while achieves almost the same data delivery rate as GRAB can do.
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