Apparatus, system and method of estimating a location of a mobile device

A system comprising:

• a mobile device comprising:
• a processor;
• a memory;
• at least one antenna;
• a transmitter;
• a receiver;
• and
• a controller coupled to the transmitter and to the receiver;
• when the mobile device is at a first location, the transmitter to wirelessly transmit a first message to a wireless communication station (STA) and the receiver to wirelessly receive a first acknowledgement (ACK) message from the STA in response to the first message,
• when the mobile device is at a second location, the transmitter to wirelessly transmit a second message to said STA and the receiver to wirelessly receive a second ACK message from the STA in response to the second message,
• when the mobile device is at a third location, the transmitter to wirelessly transmit a third message to said STA and the receiver to wirelessly receive a third ACK message from the STA in response to the second message,
• the controller 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.

A method comprising:

• transmitting a first message from a mobile device to a wireless communication station (STA) and receiving a first acknowledgement (ACK) message from the STA in response to the first message, when the mobile device is at a first location;
• transmitting a second message from said mobile device to said STA and receiving a second ACK message from the STA in response to the second message, when the mobile device is at a second location;
• transmitting a third message from said mobile device to said STA and receiving a third ACK message from the STA in response to the third message, when the mobile device is at a third location;
• determining 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, said first distance being between said first location and said STA, and said second distance being between said second location and said STA, wherein the first round trip time comprises a round trip time of the first message and the first ACK, and the second round trip time comprises a round trip time of the second message and the second ACK;
• and
• determining 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 third distance being between said third location and said STA, and the third round trip time comprises a round trip time of the third message and the third ACK.

A product including a non-transitory storage medium having stored thereon instructions that, when executed by a machine, result in:

• transmitting a first message from a mobile device to a wireless communication station (STA) and receiving a first acknowledgement (ACK) message from the STA in response to the first message, when the mobile device is at a first location;
• transmitting a second message from said mobile device to said STA and receiving a second ACK message from the STA in response to the second message, when the mobile device is at a second location;
• transmitting a third message from said mobile device to said STA and receiving a third ACK message from the STA in response to the third message, when the mobile device is at a third location;
• determining 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, said first distance being between said first location and said STA, and said second distance being between said second location and said STA, wherein the first round trip time comprises a round trip time of the first message and the first ACK, and the second round trip time comprises a round trip time of the second message and the second ACK;
• and
• determining 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 third distance being between said third location and said STA, and the third round trip time comprises a round trip time of the third message and the third ACK.