Abstract: Disclosed herein is a method of minimizing electric power consumption in a wireless sensor network. In a large-scale transmission power control process, a sender node determines whether a transmission power value for a receiver node is determined. If the transmission power value is not determined, the sender node transmits data to the receiver node at maximum power. The receiver node calculates an RSSI value, writes the RSSI value in an ACK signal, and transmits the ACK signal to the sender node. Thereafter, the sender node calculates an approximate transmission power value. In a small-scale transmission power control process, if new data is generated, the sender node transmits the data to the receiver node at newly determined transmission power. The receiver node calculates an RSSI value, writes the RSSI value in an ACK signal, and transmits the ACK signal to the sender node. The sender node adjusts a transmission power level.

Abstract: Disclosed herein is a method of minimizing electric power consumption in a non-beacon network including a parent node which maintains an active state only for a specific period in each predetermined cycle, and a child node which attempts to communicate for periods only when data is generated. When data that must be transmitted to the child node exists, the child node notifies the parent node that there is data to be transmitted. The child node periodically transmits the same message to the parent node until the parent node maintains an initial active state. If the parent node is switched into an active state and receives the data transmission notification message, the parent node commands the child node to transmit data. The child node transmits the data to the parent node. Thereafter, the parent node notifies the child node that the reception of data is normally performed.