Patent ID: 9320010
Filing Date: 2016-04-19
CPC Classification: G01S,H04W

Claim Text:
1. An apparatus comprising: a controller to control a mobile device to transmit a first message to a wireless communication station (STA) and to receive a first acknowledgement (ACK) message from the STA in response to the first message, when the mobile device is at a first location; to transmit a second message to said STA and to receive a second ACK message from the STA in response to the second message, when the mobile device is at a second location; and to transmit a third message to said STA and to receive a third ACK message from the STA in response to the third message, when the mobile device is at a third location, wherein said controller is to determine a first distance difference between a first distance and a second distance based on a first round trip time and a second round trip time, and to determine a second distance difference between the first distance and a third distance based on the first round trip time and a third round trip time, said first distance being between said first location and said STA, said second distance being between said second location and said STA, and said third distance being between said third location and said STA, wherein the first round trip time comprises a round trip time of the first message and the first ACK, the second round trip time comprises a round trip time of the second message and the second ACK, and the third round trip time comprises a round trip time of the third message and the third ACK.