21
Jan P Vanderspool II: Method for calculating a location of a remote Unit utilizing observed time difference (OTD) and real time difference (RTD) measurements.. Motorola, Kenneth A Haas, August 22, 2000: US06108558 (77 worldwide citation)

Base stations (101, 103, and 105) transmit, and a remote unit (117) receives a radio frequency (RF) location signal. The remote unit (117) then computes an observed-time-difference (OTD) for each base station at particular time t1. Observed differences in received signal times, and are reported to a ...


22
Donald E Gillespie: System and method for an integrated wireline/wireless service using private branch exchange lines. US West, Brooks & Kushman, January 11, 2000: US06014377 (72 worldwide citation)

A method and system for routing a call incoming to a Private Branch Exchange (PBX) network telephone number from outside of the PBX network based on a PBX subscriber's location includes routing the call to a wireline switch which detects predetermined PBX triggers. Also included is generating a quer ...


23
Bagher R Zadeh, Shahrokh Amirijoo: GPS assistance data for positioning of mobiles with built-in GPS. Ericsson, Arthur I Navarro, July 24, 2001: US06266533 (66 worldwide citation)

A wireless communication network and methodology providing GPS assistance data for positioning of mobiles with built-in GPS receivers (GPS-MS). The system and methodology includes obtaining a site location of the BTS currently serving a GPS-MS to be located, as well as obtaining the air interface ti ...


24
Byron H Chen, Maria E Palamara, Charles Varvaro: Local positioning system. Lucent Technologies, June 8, 2004: US06748224 (64 worldwide citation)

A local positioning system (LPS) uses the radio propagation parameters in a CDMA forward link or TDMA reverse link to establish a mobile station's position. The mobile station receives pilot channel signals from at least three distinct base stations and records the PN chip offset of the pilot c ...


25
Theodore Havinis, Dimitris Papadimitriou: System and method for providing efficient signaling for a positioning request and an indication of when a mobile station becomes available for location services. Ericsson, Jenkens & Gilchrist P C, January 30, 2001: US06181934 (60 worldwide citation)

A telecommunications system and method is disclosed for reducing the unnecessary signaling for positioning requests involving a Mobile Station (MS) when that MS does not respond to paging requests or is purged from the network, e.g., not registered with a Mobile Switching Center/Visitor Location Reg ...


26
Rajamani Ganesh: Method and system for mobile location detection using handoff information. Verizon Corporate Services Group, BBN Technologies, April 29, 2008: US07366492 (57 worldwide citation)

Methods and systems for mobile station location detection. A mobile station measures signal strength of each of a set of signals associated with the mobile station, then determines whether a number of signals in the set is less than a predetermined threshold. Based on the determination, the mobile s ...


27
Giovanni Vannucci: Mobile location estimation in a wireless system using designated time intervals of suspended communication. Lucent Technologies, February 1, 2000: US06021330 (57 worldwide citation)

Methods and apparatus for estimating mobile location in a wireless communication system including a plurality of base stations. In a base-to-mobile embodiment, the system base stations periodically transmit location signals to mobile stations during a system-wide blank-and-burst interval during whic ...


28
Bikash Saha, Christopher Kingdon, Bagher Zadeh, Tahir Hussain: System and method for time of arrival positioning measurements based upon network characteristics. Ericsson, Jenkens & Gilchrist P C, March 6, 2001: US06198935 (56 worldwide citation)

An improved system and method for determining a position of a mobile station in a mobile telecommunications network is disclosed. The system includes a database having geographical information pertaining to the service area of the telecommunications network, including whether service areas therein a ...


29
Alan Denis MacDonald, Marc W Sather, John Lawrence Snapp: Methods and apparatus for mobile station location estimation. AT&T Mobility II, Michael J Donohue, Davis Wright Tremaine, April 14, 2009: US07519372 (48 worldwide citation)

Methods and apparatus for estimating mobile station location include receiving reported signal strengths or other attachment indicator values from a mobile station. The reported signal strengths are compared with characteristic received signal strength values in a coverage area of a mobile network. ...


30
Giovanni Vannucci: Mobile location estimation in a wireless system using designated time intervals of suspended communication. Lucent Technologies, Ryan & Mason, April 30, 2002: US06381464 (48 worldwide citation)

Methods and apparatus for estimating mobile location in a wireless communication system including a plurality of base stations. In a base-to-mobile embodiment, the system base stations periodically transmit location signals to mobile stations during a system-wide blank-and-burst interval during whic ...



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