| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for estimating a node device installation position that does not need a server calculating at the center.SOLUTION: A method includes the steps of: determining grid node devices on a grid graph related to second node devices holding positional information, in which the grid node devices including the second node devices correspond to coordinates (x, y) (here, x and y are integer numbers) on the grid graph; and each first node device in the grid node devices estimating its installation position on the basis of its coordinates and positional information and coordinates of three second node devices on the grid graph. Each of the grid node devices can directly communicate bi-directionally with a grid node device corresponding to adjacent coordinates in the X-axis direction and a grid node device corresponding to adjacent coordinates in the Y-axis direction, but cannot directly communicate with grid node devices corresponding to coordinates other than adjacent coordinates in the X-axis direction and in the Y-axis direction. |
