COMMUNICATION NODE, SYSTEM AND SYNCHRONIZATION METHOD

摘要

Each sensor node (102) controls a reception unit so that, if the capacity of a battery incorporated in the sensor node (102) is at least a prescribed level, the reception unit is controlled so that the state of the sensor node (102) changes such the state of the reception unit switches from a first state in which the electricity consumption by the reception unit of the sensor node (102) is a first power to a second state in which the same is a second power which is higher than the first power. A sensor node (102) sends a synchronization request signal (S1) that requests transmission of a synchronization signal (S2) for synchronizing multi-hop communications. The sensor node (102) receives the synchronization signal (S2) in response to the synchronization request signal (S1). In a case where the sensor node (102) receives a synchronization request signal (S1) from another sensor node (102) other than the sensor node (102) itself after the reception unit received the synchronization signal (S2), the sensor node (102) sends a synchronization signal (S2) that corresponds to the received synchronization request signal (S1) and that is based on the received synchronization signal (S2).