Method for using only two base stations for determining the position of a mobile subscriber in a CDMA cellular telephone system
First Claim
1. A method for determining the position of a mobile station within a cellular telephone system having first and second base stations, comprising the steps of:
- (A) measuring, at said first base station, a round trip signal propagation time between said first base station and said mobile station;
(B) transmitting a first signal from said first base station to said mobile station, and transmitting a second signal from said second base station to said mobile station;
(C) measuring, at said mobile station, an arrival time difference representing a time interval between a first relative time when said first signal is received at said mobile station and a second relative time when said second signal is received at said mobile station; and
(D) determining said position of said mobile station in accordance with said round trip propagation time and said arrival time difference.
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Abstract
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.
185 Citations
14 Claims
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1. A method for determining the position of a mobile station within a cellular telephone system having first and second base stations, comprising the steps of:
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(A) measuring, at said first base station, a round trip signal propagation time between said first base station and said mobile station; (B) transmitting a first signal from said first base station to said mobile station, and transmitting a second signal from said second base station to said mobile station; (C) measuring, at said mobile station, an arrival time difference representing a time interval between a first relative time when said first signal is received at said mobile station and a second relative time when said second signal is received at said mobile station; and (D) determining said position of said mobile station in accordance with said round trip propagation time and said arrival time difference. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for determining the position of a mobile station within a cellular telephone system having first and second base stations, comprising the steps of:
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(A) measuring, at said first base station, a first round trip signal propagation time between said first base station and said mobile station; (B) measuring, at said second base station, a second round trip signal propagation time between said second base station and said mobile station; and (C) determining said position of said mobile station in accordance with said first and second round trip propagation times. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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Specification