E-zigbee with complex postioning fuction and device and method for indoor postioning using the same

Indoor Positioning device according to one embodiment of the present invention, a tag generates a radio signal; And it receives the radio signal from the tag check the strength of the tag ID and the received radio signal and transmits the wireless signal includes a flag in the tag, and receives the wireless signal including the flag from the tag of the radio signal intensity information and the AP to transmit the flag information transmission and reception time of the radio signal containing the; And a wireless signal signal including the tag receives the reception time information of the wireless signal including the intensity information and the flag of the radio signal from the AP includes a location server to determine a location of the tag, the flag from the AP start time count of the received tag, and, and ends the time counting of the transmitted tag, the radio signal including the flag to the AP, the AP will start the time count of the AP during transmission of the radio signal including the flag in the tag , and finishes the time counting upon the AP from the tag receives a radio signal including the flag.