Method and system of positioning
First Claim
Patent Images
1. A method of positioning a radio transmitter, comprising the steps of:
- determining a distance to a receiver of known position according to a parameter reflecting propagation delay time;
determining direction from the receiver to the transmitter from a respective parameter reflecting received signal level in a cell/sector where the transmitter is camping or being served and a signal level in one or more co-sited cells/sectors different from the cell/sector where the transmitter is camping or being served, wherein said direction is determined by forming a respective linear scale ratio of or dB-scale differences between at least one or more neighbor cells/sectors received level and a received level of the cell/sector where the transmitter is camping or being served, the received levels being related to the same site.
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Abstract
The present invention relates to cellular mobile radio systems, particularly to systems of more than one co-sited cell/sector. A method and apparatus for high accuracy enhanced positioning not requiring more sites than one to be involved in positioning is disclosed.
25 Citations
16 Claims
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1. A method of positioning a radio transmitter, comprising the steps of:
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determining a distance to a receiver of known position according to a parameter reflecting propagation delay time; determining direction from the receiver to the transmitter from a respective parameter reflecting received signal level in a cell/sector where the transmitter is camping or being served and a signal level in one or more co-sited cells/sectors different from the cell/sector where the transmitter is camping or being served, wherein said direction is determined by forming a respective linear scale ratio of or dB-scale differences between at least one or more neighbor cells/sectors received level and a received level of the cell/sector where the transmitter is camping or being served, the received levels being related to the same site. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device for positioning a radio transmitter, comprising:
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means for determining distance to a receiver of known position according to a parameter reflecting propagation delay time; and
,means for determining direction from the receiver to the transmitter from a respective parameter reflecting received signal level in a cell/sector where the transmitter is camping or being served and signal level in one or more co-sited cells/sectors, wherein said direction to the transmitter Is determined by forming a respective ratio of the neighbor cell/sector received level and a received level of a cell/sector where the transmitter is camping or being served, the received levels being related to the same site. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification