GATEWAY NODE DEVICE, SENSOR NODE DEVICE, AND METHOD FOR CONTROLLING ACTIVE TIME PERIOD

摘要

A processor of a gateway node device determines whether to divide a first tree included in a tree structure formed by sensor node devices intermittently operating and the gateway node device as a root of the tree structure. The first tree includes a first node device as a root. The processor divides, upon determining to divide the first tree, the first tree into a second tree and a third tree at a second node device different from the first node device. The second node device is a root of the second tree. The second node device is a child node of the third tree. The processor assigns active time periods within an intermittent operation cycle to the respective second and third trees. The assigned active time periods are mutually disjoint. The processor notifies sensor node devices included in the first tree of the assigned active time periods.