Terminal PRS Beam Measurement Reporting for 5G Positioning
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately determining the position of a terminal (user equipment) in scenarios supporting beamforming, particularly in next-generation communication systems like 5G, where high mobility and low latency are required.
Innovation Solution
A method and apparatus for a user equipment (UE) to measure and report positioning reference signals (PRS) by applying beamforming, where the UE measures multiple PRSs received in different transmission beams and reports the measurement results, including transmission beam identification and resource information, to a base station (BS).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If beamforming is applied to PRS transmission, then positioning accuracy is improved, but device complexity increases due to multiple beams and measurement reporting
Solution Approach 1:
The patent segments the positioning measurement process by having the UE measure and report PRS separately for each transmission beam. The UE identifies multiple PRS resources corresponding to different beams and reports measurement results (e.g., RSRP, RSTD) along with beam identification information for each beam individually, enabling the network to determine UE position based on beam-specific measurements
Solution Approach 2:
The patent introduces beam identification information (such as TCI state IDs, SSB indices, or PRS resource indicators) as an intermediary element that links the measurement results to specific transmission beams. This intermediary enables the network to associate positioning measurements with directional beam information without requiring complex direct beam management
2Measurement precision
If multiple PRSs are measured in different transmission beams, then positioning accuracy is improved, but measurement and reporting overhead increases
Solution Approach 1:
The patent extracts only the essential positioning information from multiple beam measurements for reporting. The UE selects and reports key parameters such as reference signal received power (RSRP), reference signal time difference (RSTD), or time of arrival (TOA) along with corresponding beam identification information, omitting redundant measurement details while preserving positioning accuracy
Solution Approach 2:
The patent changes the reporting parameters by introducing compact beam identification fields (such as TCI state indicators or resource index values) that efficiently represent multiple beams. The measurement reports include parameters like L1-RSTD, L1-RLT, or L1-RSRP paired with beam IDs, reducing the information burden compared to reporting full measurement datasets
Data Source
AI summary
A method for measuring and reporting, by a terminal, a positioning reference signal (PRS) in a wireless communication system according to one embodiment of the present invention comprises the steps of: measuring a plurality of positioning reference signals (PRSs) to which beamforming is applied; and reporting, to a base station, measurement results for at least two of the plurality of PRSs, wherein the plurality of PRSs are received via different transmission beams, and the terminal may report, to the base station, at least one from among transmission beam identification information indicating through which transmission beam each of the at least two PRSs has been received and resource identification information indicating through which resource each of the at least two PRSs has been received, together with the measurement results. The terminal is capable of communicating with at least one of another terminal, a terminal related to an autonomous driving vehicle, a base station or a network.