Position determination in wireless communication systems
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United States of America Patent
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Apr 10, 2007
Grant Date -
Nov 20, 2003
app pub date -
May 16, 2002
filing date -
May 16, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
In the present invention, the altitude is introduced in the positioning determination. Preferably a three-dimensional position determination is performed. The altitude is according to the present invention introduced as additional information in terms of pre-determined geographical altitude data (40). The position determining can take place either in the mobile unit (20) or in any suitable node (10:1) in the wireless communication system (1). A provisional two-dimensional position can also be provided, which is subsequently corrected to a three-dimensional position by use of pre-determined altitude data. The position determination is based on arrival time measurements (t.sub.1 t.sub.3) of signals (30:1 30:3) between the mobile unit (20) and base stations (10:1 10:3) of the system (1). Both downlink and uplink signals are possible to use. Round trip time measurements can be used to further reduce the need for several hearable base stations (10:1 10:3).
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