초록 ▼

A method and apparatus for efficiently transmitting location assistance information to a mobile communication device over a control channel with a minimal impact on the capacity of the control channel. A position location server provides a difference between satellite locations which have been compu

A method and apparatus for efficiently transmitting location assistance information to a mobile communication device over a control channel with a minimal impact on the capacity of the control channel. A position location server provides a difference between satellite locations which have been computed using Almanac data and then Ephemeris data. Sending only the difference between the locations and clock corrections computed using the two different data types, the total amount of information to be transmitted to a mobile communication device is significantly reduced. Furthermore, by providing rate of change information, the method and apparatus allows the location assistance information to remain valid for a relatively long time after it is has been received by the mobile communication device.

대표청구항 ▼

[ What is claimed is:] [1.] A method for calculating the position of a satellite, including the steps of:a) transmitting Almanac data to a mobile communication device;b) computing the location of the satellite at a first point in time using the transmitted Almanac data;c) computing the clock correct

[ What is claimed is:] [1.] A method for calculating the position of a satellite, including the steps of:a) transmitting Almanac data to a mobile communication device;b) computing the location of the satellite at a first point in time using the transmitted Almanac data;c) computing the clock correction for the satellite at the first point in time using the transmitted Almanac data;d) computing the location of the satellite at the using Ephemeris data at the first point in time;e) computing the satellite clock correction for the satellite at the first point in time using the Ephemeris data;f) computing difference between the location and satellite clock correction computed using the transmitted Almanac data and the location and clock correction using the Ephemeris data; andg) transmitting to the mobile communication device the computed differences.