Patent ID: 8432831

Claim:
A routing method for a wireless sensor network having a sensor field defined by a plurality of clusters each including a plurality of sensor nodes and a header node, one of the cluster is a destination cluster including a sink node, comprising: announcing, at at least one source node which is the sensor node detecting an event, the event by transmitting a data announcement packet; requesting, at the sink node, the source node to transmit data required for ubiquitous services; and transmitting, at the at least one source node, data to the sink node, wherein announcing the event comprises: relaying, at the at least one source node, a data announcement packet from a source cluster to which the source node belongs to a destination cluster which is arranged along an i th second direction axis through the header nodes of the clusters arranged along a first direction axis of the source cluster, wherein the i th second direction axis is a center second direction axis in the sensor field, and the first direction axis is a vertical direction axis in the sensor field, wherein the sensor field comprises the clusters defined at cross sections of a plurality of first and second direction axes.