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Cell Phones

Method-for-using-only-two-base-stations-for-determining-the-position-of-a-mobile-subscriber-in-a-CDMA-cellular-telephone-system

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Method for using only two base stations for determining the position of a mobile subscriber in a CDMA cellular telephone system

Details

Inventors: Gilhousen, Klein S.;
Assignee:
Primary Examiner: Tarcza; Thomas H.
Assistant Examiner: Phan; Dao L.
Attorney, Agent or Firm: Miller; Russell B., English; Sean, Greenhaus; Bruce W.

A method for determining the position of a mobile station within a cellular telephone system having first and second base stations. A round trip signal propagation time between the first base station and the mobile station is measured at the first base station. A first signal is transmitted from the first base station to the mobile station, and a second signal is transmitted from the second base station to the mobile station. An arrival time difference representing a time interval between a first relative time when the first signal is received at the mobile station and a second relative time when the second signal is received at the mobile station is measured at the mobile station. The position of the mobile station is determined in accordance with the round trip propagation time and the arrival time difference. A method for determining the position of a mobile station within a cellular telephone system having first and second base stations. A first round trip signal propagation time between the first base station and the mobile station is measured at the first base station. A second round trip signal propagation time between the second base station and the mobile station is measured at the second base station. The position of the mobile station is determined in accordance with the first and second round trip propagation times.

DETAILED DESCRIPTION The present invention is directed to a method for determining the position of a mobile station within a cellular telephone system having first and second base stations.
A round trip signal propagation time between the first base station and the mobile station is measured at the first base station.
A first signal is transmitted from the first base station to the mobile station, and a second signal is transmitted from the second base station to the mobile station.
An arrival time difference representing a time interval between a first relative time when the first signal is received at the mobile station and a second relative time when the second signal is received at the mobile station is measured at the mobile station.
The position of the mobile station is determined in accordance with the round trip propagation time and the arrival time difference.
In accordance with a further aspect, the present invention is directed to a method for determining the position of a mobile station within a cellular telephone system having first and second base stations.
A first round trip signal propagation time between the first base station and the mobile station is measured at the first base station.
A second round trip signal propagation time between the second base station and the mobile station is measured at the second base station.
The position of the mobile station is determined in accordance with the first and second round trip propagation times.

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