An apparatus of a first wireless device in a wireless communication system, the apparatus comprising: a transmitter/receiver configured to: transmit, to a second wireless device , first range capability information of the first wireless device ; receive, from the second wireless device , second range capability information of the second wireless device ; and if the first range capability information indicates that the first wireless device is capable of transmitting a null data packet and the second range capability information indicates that the second wireless device is capable of receiving the null data packet, transmit the null data packet as a request range packet to the second wireless device, and receive a response range packet from the second wireless device; and at least one processor configured to estimate a location of the second wireless device based on a processing delay for the null data packet and the response range packet, wherein the at least one processor is further configured to estimate a distance between the first wireless device and the second wireless device based on a first time difference (Ti) between a time point of transmission of the null data packet and a time point of detection of reception of the response range packet, and a second time difference (Tr) between a time point of detection of reception of the null data packet and a time point of transmission of the response range packet. a transmitter/receiver configured to: transmit, to a second wireless device , first range capability information of the first wireless device ; receive, from the second wireless device , second range capability information of the second wireless device ; and if the first range capability information indicates that the first wireless device is capable of transmitting a null data packet and the second range capability information indicates that the second wireless device is capable of receiving the null data packet, transmit the null data packet as a request range packet to the second wireless device, and receive a response range packet from the second wireless device; and transmit, to a second wireless device , first range capability information of the first wireless device ; receive, from the second wireless device , second range capability information of the second wireless device ; and if the first range capability information indicates that the first wireless device is capable of transmitting a null data packet and the second range capability information indicates that the second wireless device is capable of receiving the null data packet, transmit the null data packet as a request range packet to the second wireless device, and receive a response range packet from the second wireless device; and at least one processor configured to estimate a location of the second wireless device based on a processing delay for the null data packet and the response range packet, wherein the at least one processor is further configured to estimate a distance between the first wireless device and the second wireless device based on a first time difference (Ti) between a time point of transmission of the null data packet and a time point of detection of reception of the response range packet, and a second time difference (Tr) between a time point of detection of reception of the null data packet and a time point of transmission of the response range packet. <EOS>