Patent ID: 9173183
Filing Date: 2015-10-27
Classification: H04W

Abstract:
1. A method, comprising: receiving, by a location server, a first time difference of arrival (TDOA) measurement obtained by a mobile device, wherein the first TDOA measurement relates to wireless signals transmitted from a first node and a second node and received by the mobile device, wherein the first and second nodes are synchronized to a time reference; receiving, by the location server, a second TDOA measurement obtained by the mobile device, wherein the second TDOA measurement relates to wireless signals transmitted from the first node and a third node and received by the mobile device, wherein the third node is mobile, and wherein the third node has a time synchronization error relative to the time reference; receiving, by the location server, additional location-determination data obtained by the mobile device, wherein the additional location-determination data relates to a one-dimensional bar code or a two-dimensional bar code; determining, by the location server, a location of the third node; and determining, by the location server, the time synchronization error based on at least the first TDOA measurement, the second TDOA measurement, the additional location-determination data, and the determined location of the third node.