Threshold determination in TDOA-based positioning system
AssigneeMotorola Mobility LLC
InventorsSandeep H. Krishnamurthy, Colin D. Frank
Life of this patent
Estimating the term…
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.
Claims13
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.
A method in a wireless communication terminal, the method comprising:
- 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.
Dependencies are inferred from the claim text.