Patent ID: 8174997

Claim:
A communication method in a sensor network including a plurality of nodes, comprising: receiving, by a first node of the plurality of nodes, a signal from a second node, at least once; and managing, by the first node, a link state with the second node according to a received signal strength indicator (RSSI) of the received signal, said managing comprising: storing RSSIs of the plurality of nodes, based on signal-received times; and predicting link states using the stored RSSIs, said predicting the link states comprises: estimating a distance between the first node and the second node, a moving speed of the second node, and a moving start time point of the second node, wherein the moving start time point of the second node is estimated by averaging a time point when the signal is received in a final stationary state and a time point when the signal is received in a first moving state; and determining whether the second node moves; and communicating, by the first node with the second node according to a link state.