Method and Arrangement for Determining Terminal Position
First Claim
1. A method of determining positions of mobile terminals in a cell of a mobile communication network where time alignment is employed for terminal transmissions in timeslots to a serving base station providing radio coverage in said cell, the method comprising:
- determining a timing independent distance (D) to the base station for at least one mobile terminal in the cell;
obtaining a current timing value (T) used by the at least one mobile terminal for timing adjustment of uplink signal transmissions;
estimating a relation between the determined timing independent distance and the obtained current timing value for each mobile terminal;
determining a timing bias of the cell or the at least one mobile terminal based on the estimated relation as a calibration parameter for position determination of any mobile terminals in said cell using a timing based positioning method;
adjusting the current timing value based on the timing bias; and
determining a position of a subsequent mobile terminal using a timing independent distance determined for the subsequent mobile terminal and said adjusted timing value.
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Accused Products
Abstract
A method and apparatus for determining the position of mobile terminals in a cell of a mobile communication network where timing-based alignment is employed for terminal transmissions in timeslots to a serving base station. First, the distance to the base station is determined for at least one mobile terminal in the cell. A current timing value used by the at least one mobile terminal for timing adjustment of signal transmissions is also obtained. A relation between the determined timing independent distance and the obtained current timing value for each terminal is then estimated, and a timing bias of the cell or the at least one mobile terminal is determined based on the estimated relation. The position of subsequent terminals can then be determined using a timing based positioning method and the timing bias, such that the current timing value used by the subsequent terminal is adjusted by the timing bias.
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Citations
24 Claims
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1. A method of determining positions of mobile terminals in a cell of a mobile communication network where time alignment is employed for terminal transmissions in timeslots to a serving base station providing radio coverage in said cell, the method comprising:
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determining a timing independent distance (D) to the base station for at least one mobile terminal in the cell; obtaining a current timing value (T) used by the at least one mobile terminal for timing adjustment of uplink signal transmissions; estimating a relation between the determined timing independent distance and the obtained current timing value for each mobile terminal; determining a timing bias of the cell or the at least one mobile terminal based on the estimated relation as a calibration parameter for position determination of any mobile terminals in said cell using a timing based positioning method; adjusting the current timing value based on the timing bias; and determining a position of a subsequent mobile terminal using a timing independent distance determined for the subsequent mobile terminal and said adjusted timing value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A positioning unit configured to determine positions of mobile terminals in a cell of a mobile communication network where time alignment is employed for terminal transmissions in timeslots to a serving base station providing radio coverage in said cell, the arrangement comprising:
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a distance determining unit configured to determine a distance timing independent (D) to the base station for at least one mobile terminal in the cell; an obtaining unit configured to obtain a current timing value (T) used by the at least one mobile terminal for timing adjustment of uplink signal transmissions; a logic unit configured to estimate a relation between the determined timing independent distance and the obtained current timing value for each mobile terminal, and to determine a timing bias of the cell or the at least one mobile terminal based on the estimated relation as a calibration parameter for position determination of any mobile terminals in said cell using a timing based positioning method; and a position determining unit configured to adjust the current timing value based on the timing bias and to determine a position of a subsequent mobile terminal using a timing independent distance determined for the subsequent mobile terminal and said adjusted timing value. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification