Wireless sensor network and method for communicating thereof

The present invention is a wireless sensor network, and relates to its communication method in a wireless sensor network for performing at least one top node and a plurality of child nodes to communicate, the indirect transmission to the upper node transmits the downlink data to the lower node interval and the indirect transmission interval with neighbors, and when transmitting a beacon message to identify the direct transfer section for receiving uplink data from a subordinate node, the received beacon messages, the lower node that transmission interval direct and indirect transmission interval from the beacon message to identify and, in the indirect transfer section, and the upper node transmits a downlink data sequentially in the sub-node, characterized in that in the direct transmission interval, the lower node to send the uplink data to the upper node. According to the invention, when the parent node and a plurality of sub-node communication, it is possible to efficiently transmit data to the lower node from the parent node. Accordingly, it is possible to suppress the waste of the battery power from the parent node and the child node. Wireless sensor networks, the parent node, the beacon message, the child nodes, identification address