Patent ID: 8244275
Filing Date: 2012-08-14
Classification: G01S,H04W

Abstract:
1. A method for estimating a location of a wireless device receiving signals from plural nodes of a Universal Mobile Telecommunications System (“UMTS”) network, the method comprising: (a) collecting observed time difference of arrival (“OTDOA”) measurements of signals received by the wireless device; (b) transmitting a message to a stand alone serving mobile location center (“SAS”), the message including round trip time information, tipping information, and the collected OTDOA measurements; (c) tasking one or more location measurement units (“LMU”) to determine uplink and downlink signal measurements between the wireless device and ones of the plural nodes as a function of the transmitted message; (d) determining at the one or more LMUs range measurements from the wireless device to ones of the plural nodes, uplink time of arrival (“TOA”) measurements, and downlink TOA measurements; and (e) estimating a location of the wireless device as a function of the uplink and downlink TOA measurements, OTDOA measurements, round trip time information, and range measurements.