Patent Number: 8,818,424

Title: Inter-AP distance estimation using crowd sourcing

Abstract: Techniques are provided for utilizing one or more mobile devices to estimate distances between wireless access points (APs). Embodiments can, for example, enable mobile devices, wireless APs, and/or other systems to estimate a distance between two wireless APs using Round-Trip Time (RTT) measurements obtained by one or more mobile devices. The RTT measurements can be utilized based on whether one or more related Received Signal Strength Indication (RSSI) measurements exceed a threshold value. Embodiments can also utilize crowdsourcing to obtain distance estimation data (e.g., distance estimates, RTT and/or RSSI measurements, etc.) from one or more mobile devices and/or propagate a determined distance, based on the distance estimation data, to multiple devices.

Inventors: Emadzadeh; Amir A. (Santa Clara, CA), Venkatraman; Sai Pradeep (Santa Clara, CA), Gao; Weihua (San Jose, CA)

Assignee: Qualcomm Incorporated

International Classification: H04W 24/00 (20090101); H04B 7/00 (20060101); G01S 19/00 (20100101); G01S 3/02 (20060101)

Expiration Date: 8/26/12018