| 摘要 |
<P>PROBLEM TO BE SOLVED: To transmit data, to a receiver node, using the minimum electric power from a transmitting node which constitutes a network. <P>SOLUTION: Prior to transmitting data from a transmitting node to a receiving node, it is confirmed whether a transmission power value is predetermined for the receiving node and if the transmission power value is not predetermined, the transmitting node transmits data to the receiving node at maximum power. The receiving node that has received the data calculates an RSSI value, writes the RSSI value in an ACK signal, and transmits the ACK signal to the transmitting node. Thereafter, the transmitting node that has received the ACK calculates an approximate transmission power value from the RSSI value attached to the ACK signal. If new data are generated later, the data are transmitted to the receiving node at minimum transmission power newly determined at the transmitting node, the receiving node that has received data at the newly determined minimum transmission power calculates an RSSI value, writes the RSSI value in an ACK signal, and transmits the ACK signal to the transmitting node. The transmitting node adjusts a minimum transmission power level, based on the transmitted RSSI value. <P>COPYRIGHT: (C)2009,JPO&INPIT |
