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US 6,665,540 B2Granted
Method and system for locating a mobile terminal in a cellular radio network
AssigneeNokia Mobile Phones Ltd.
InventorsTimo Rantalainen, Jani Moilanen
Life of this patent
Estimating the term…
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AssigneeNokia Mobile Phones Ltd.
InventorsTimo Rantalainen, Jani Moilanen
Estimating the term…
A method and system for estimating the location of a mobile station in a telecommunications network having a reference base station and a plurality of neighboring base stations. At the beginning of the E-OTD measurement, the mobile station may be provided with the expected OTD values in the reference base station site, possibly instead of RTD values of the neighboring base stations, to make it possible for the mobile station to calculate the uncertainty in the measured OTD due to its unknown location. Alternatively, the network provides the mobile station the expected OTD values in its current location, and the estimated uncertainty of those values. When the uncertainty is greater than a predetermined value, the mobile station makes E-OTD measurements based on the SCH burst. Otherwise, the mobile station makes measurements based on normal/dummy bursts, and/or aligns the time window for taking samples from signals received from neighboring base stations.
A method of estimating a location of a mobile station in a mobile telecommunications network having a first base station, and a plurality of second base stations neighboring the first base station for providing communication links to the mobile station, wherein the first base station is located at a first site and second base stations are located at respective second sites, and the first and second base stations provide synchronization channel bursts and further bursts to the mobile station for allowing the mobile station to make arrival time measurements, said method comprising the steps of:
A system for estimating a location of a mobile station in a mobile telecommunications network having a first base station and a plurality of second base stations neighboring the first base station for providing communication links to the mobile station, wherein the first base station is located at a first site and second base stations are located at respective second sites, and the first and second base stations provide synchronization channel bursts and further bursts to the mobile station for allowing the mobile station to make arrival time measurements, said system comprising:
Dependencies are inferred from the claim text.