Patent ID: 8089909

Claim:
An asynchronous sensor network comprising a plurality of nodes which perform a low power listening (LPL) operation in an asynchronous manner at predetermined time intervals, the asynchronous sensor network comprising: a sender node, which is from among the plurality of nodes, generating a second preamble comprising at least one first preamble for reducing overhearing of other nodes if the sender node has transmission data, and sequentially transmitting the second preamble and the transmission data; and a receiver node determining whether a valid signal transmitted from the sender node is sensed during an active state in the LPL operation, receiving the first preamble transmitted from the sender node if it is determined that the valid signal is sensed, and determining a duration time of a deactivated state of the receiver node based on a destination address of the transmission data transmitted by the sender node, a preamble remainder of the second preamble at a time position of the received first preamble, and a length of the transmission data from the plurality of nodes among information included in the received first preamble.