Monitoring changeable locations of client devices in wireless networks

A refusing space from the edge wireless device of the external at stipulation, to improve the wireless network the safety. Using the reversing antenna array is provided with multiple measuring point; and calculates the vector the point of the part, determining wireless device to elastic space position. The determines the position to the; and device of the preset hollow outer edge, which can be rejected to the wireless network access. Or, the device or beside the position of the hollow edge can be used for monitoring wireless network one or more client apparatus a position, a wire of the larceny detecting or the larceny preventing mechanism.