Apparatus, system and method of one-sided round-trip-time (RTT) measurement
View Patent ↗Some demonstrative embodiments include apparatuses, devices, systems and methods of one-sided Round-Trip-Time (RTT) measurement. For example, an apparatus may include circuitry and logic configured to cause a mobile device to receive bias information of an Access-Point (AP); perform a one-sided round-trip-time (RTT) measurement with the AP; and estimate a range between the mobile device and the AP based on the one-sided RTT measurement and the bias information.
1. A server to provide information to a mobile device, the server comprising:
a communication interface configured to receive from a plurality of wireless devices a plurality of reports corresponding to an Access Point (AP), a report from a wireless device comprising an identifier of the AP and a calculated range between the wireless device and the AP, the communication interface configured to receive from the mobile device a request to receive bias information of the AP, the request comprising the identifier of the AP; and
a bias calculator configured to determine the bias information of the AP based on the identifier of the AP, and to send the bias information of the AP to the mobile device via the communication interface, the bias calculator configured to determine the bias information of the AP based on a minimal calculated range in the plurality of reports and mapping information corresponding to a location of the AP, the bias calculator configured to update the bias information of the AP based on a received report comprising a calculated range, which is shorter than the minimal calculated range.
2. The server of claim 1 , wherein the bias calculator is configured to determine, based on the mapping information, an estimated location of a wireless device from which the minimal calculated range is reported, and configured to determine the bias information of the AP, based on the location of the AP and the estimated location of the wireless device.
3. The server of claim 1 comprising a database (DB), wherein the bias calculator is configured to store in the DB a plurality of bias information elements corresponding to a plurality of APs having a respective plurality of identifiers, and configured to retrieve from the DB the bias information of the AP based on the identifier of the AP.
4. The server of claim 1 comprising a memory, and a processor.
5. A product comprising one or more tangible computer-readable non-transitory storage media comprising computer-executable instructions operable to, when executed by at least one computer processor, enable the at least one computer processor to cause a server to:
receive from a plurality of wireless devices a plurality a reports corresponding to an Access Point (AP), a report from a wireless device comprising an identifier of the AP and a calculated range between the wireless device and the AP:
determine the bias information of the AP based on a minimal calculated range in the plurality of reports and mapping information corresponding to a location of the AP:
update the bias information of the AP based on a received report comprising a calculated range, which is shorter than the minimal calculated range;
receive from a mobile device a request to receive bias information of the AP, the request comprising the identifier of the AP;
determine the bias information of the AP based on the identifier of the AP; and
send the bias information of the AP to the mobile device.
6. The product of claim 5 , wherein the instructions, when executed, cause the server to determine, based on the mapping information, an estimated location of a wireless device from which the minimal calculated range is reported; and determine the bias information of the AP, based on the location of the AP and the estimated location of the wireless device.
7. The product of claim 5 , wherein the instructions, when executed, cause the server to store in a database (DB) a plurality of bias information elements corresponding to a plurality of APs having a respective plurality of identifiers; and retrieve the bias information of the AP based on the identifier of the AP.