Patent ID: 8265045

Claim:
A method for reducing power consumption in a wireless sensor network, the method comprising the steps of: setting, by a first node, an optimized path destined for a sink node by using a common channel in which the first node and a second node use a Carrier Sense Multiple Access (CSMA) scheme; setting, by the first node, a first channel for packet transmission/reception with child nodes of the first node, and allocating transmission slots for packet transmission to the child nodes of the first channel and reception slots for packet reception from the child nodes of the first node in the first channel; transmitting, by the first node, a packet to the second node, which is allocated a first transmission slot among the transmission slots of the first channel, through the first transmission slot by using a Time Division Multiple Access (TDMA) scheme; and when a packet is not received from the second node, which is allocated a first reception slot among the reception slots of the first channel, through the first reception slot within a first set amount of time, allowing, by the first node, the first reception slot to transition to an inactive state, wherein the first node is one of at least one parent node connected to the sink node, and at least one child node connected to the at least one parent node, and the second node is a child node of the first node.