Patent ID: 8478314

Claim:
A communication method for a mobile sensor node in a wireless sensor network which is constructed by linearly connecting a plurality of sensor nodes, comprising: in a state that the mobile sensor node performs synchronization with reference to a message reception interrupt from a parent sensor node and determines transmitting and receiving durations of an uplink active duration and transmitting and receiving durations of a downlink active duration, transmitting a message to the parent sensor node in the transmitting duration of the uplink active duration, receiving and processing messages from the parent sensor node and sensor nodes linearly connected around the parent sensor node in the receiving duration of the uplink active duration, and resetting a new parent sensor node with reference to a received signal strength indication RSSI of the received messages; and transmitting a message to the parent sensor node in the transmitting duration of the downlink active duration, checking whether or not a message is received from the parent sensor node in the receiving duration of the downlink active duration, if the message is not received from the parent sensor node, determining that time synchronization fails and resetting a new parent sensor node, and if the message is received from the parent sensor node, performing synchronization according to a message reception interrupt from the parent sensor node.