Localization-based beamforming scheme for systems with multiple antennas
AssigneeMediaTek Singapore Pte. Ltd.
InventorsWen-Rong Wu, Yun-Kai Wang
Life of this patent
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Abstract
A method of accurate 3D positioning with reduced cost is proposed. A user equipment (UE) receives a plurality of positioning reference signals (PRSs) from a plurality of base stations. The plurality of base stations includes a serving base station and two neighboring base stations. The UE estimates a plurality of line-of-sight (LOS) paths and corresponding indexes of the PRSs for time of arrival (TOA) and time difference of arrival (TDOA) measurements. The UE then estimates an elevation angle of the UE based on the estimated LOS paths of the PRS from the serving base station. Finally, the system (either UE or network, depending on where the coordinates are) can calculate the UE position based on the TDOA measurements and the elevation angle.
Claims16
A method comprising:
- receiving a plurality of positioning reference signals (PRSs) from a plurality of base stations by a user equipment (UE) in a mobile communications network, wherein the UE receives a PRS transmission from a serving base station applied with distinct beamforming vectors for multiple OFDM symbols using multiple antennas;
- estimating a plurality of line-of-sight (LOS) paths and corresponding indexes of the PRSs for time of arrival (TOA) and time difference of arrival (TDOA) measurements;
- estimating an elevation angle of the UE based on the estimated LOS paths of the PRS from the serving base station, wherein the UE estimates the elevation angle based on multiple LOS path measurements that correspond to the multiple OFDM symbols in one subframe;
- determining whether the UE knows the plurality of base station positions;
- and
- calculating a UE position based on the TOA/TDOA measurements and the elevation angle when the UE knows the plurality of base stations positions.
A user equipment (UE), comprising:
- a radio frequency (RF) receiver that receives a plurality of positioning reference signals (PRSs) transmitted from a plurality of base stations in a mobile communications network, wherein the UE receives a PRS transmission from a serving base station applied with distinct beamforming vectors for multiple OFDM symbols using multiple antennas;
- a channel estimation circuit that estimates a plurality of line-of-sight (LOS) paths and corresponding indexes of the PRSs for time of arrival (TOA) and time difference of arrival (TDOA) measurements;
- an elevation angle estimation circuit that estimates an elevation angle of the UE based on the estimated LOS paths of the PRS from a serving base station, wherein the UE estimates the elevation angle based on multiple LOS path measurements that correspond to the multiple OFDM symbols in one subframe;
- and
- a positioning circuit that calculates a UE position based on the TOA/TDOA measurements and the elevation angle if the UE knows positions of the base stations.
Dependencies are inferred from the claim text.