Threshold determination in TDOA-based positioning system
First Claim
Patent Images
1. A method in a wireless communication terminal, the method comprising:
- receiving a Positioning Reference Signal (PRS) transmission from a serving cell and a PRS from a neighbor cell;
estimating a signal quality metric (SQM) based on the PRS of the neighbor cell;
estimating a time difference of arrival (TDOA) measurement for the neighbor cell based on the PRS of the neighbor cell;
determining if the estimated SQM satisfies a first criterion threshold T_X1<
=SQM<
=threshold T_X2, wherein at least one of the thresholds T_X1 or T_X2 is based at least in part on a signal received from the serving cell;
sending a report to the serving cell that includes the estimated TDOA if the first criterion is satisfied;
determining at least one of T_X1 and T_X2 based on a serving cell signal power received at the wireless communication terminal;
determining whether a strength of a signal received from the serving cell satisfies a second criterion;
threshold T_Y1<
=SCSS<
=threshold T_Y2; and
sending the report to the serving cell only if the first and second criteria are satisfied.
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Abstract
A method in a wireless communication terminal including receiving a signal comprising at least a Positioning Reference Signal (PRS) transmission from a serving cell and a PRS transmission from a neighbor cell, estimating a signal quality metric (SQM) based on the PRS transmission from the neighbor cell, estimating a time difference of arrival (TDOA) measurement for the neighbor cell based on the PRS transmissions, determining if the estimated SQM satisfies a criterion, and sending a report to the serving cell that includes at least the estimated TDOA if the criterion is satisfied.
78 Citations
13 Claims
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1. A method in a wireless communication terminal, the method comprising:
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receiving a Positioning Reference Signal (PRS) transmission from a serving cell and a PRS from a neighbor cell; estimating a signal quality metric (SQM) based on the PRS of the neighbor cell; estimating a time difference of arrival (TDOA) measurement for the neighbor cell based on the PRS of the neighbor cell; determining if the estimated SQM satisfies a first criterion threshold T_X1<
=SQM<
=threshold T_X2, wherein at least one of the thresholds T_X1 or T_X2 is based at least in part on a signal received from the serving cell;sending a report to the serving cell that includes the estimated TDOA if the first criterion is satisfied; determining at least one of T_X1 and T_X2 based on a serving cell signal power received at the wireless communication terminal; determining whether a strength of a signal received from the serving cell satisfies a second criterion;
threshold T_Y1<
=SCSS<
=threshold T_Y2; andsending the report to the serving cell only if the first and second criteria are satisfied. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method in a wireless communication terminal, the method comprising:
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receiving a Positioning Reference Signal (PRS) from a serving cell and a PRS from a neighbor cell; estimating a signal quality metric (SQM) based on the PRS of the neighbor cell; estimating a time difference of arrival (TDOA) measurement for the neighbor cell based on the PRS of the neighbor cell; determining if the estimated SQM satisfies a criterion threshold T_X1<
=SQM <
=threshold T_X2, wherein at least one of the thresholds T_X1 or T_X2 is based on a frame timing offset between the serving cell and the neighbor cell;sending a report to the serving cell that includes the estimated TDOA if the criterion is satisfied; determining whether the serving cell PRS is muted during an occasion in which the neighbor cell PRS is received; and estimating the TDOA based on the PRS signal received during the occasion in which the serving cell PRS is muted, wherein at least one of the thresholds T_X1 or T_X2 is based on whether the serving cell PRS was muted. - View Dependent Claims (11, 12, 13)
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Specification