Downlink Angle-of-Departure Positioning with Adjacent-Beam RSRP
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Solution Overview
Problem
Conventional 5G NR positioning methods suffer from inaccuracies due to physical interference and obstacles, leading to reduced accuracy in angle-of-departure calculations, especially in real-world environments where line-of-sight communication is obstructed, and require significant overhead in DL PRS resource transmission.
Innovation Solution
The method involves configuring user equipment (UE) to measure and report reference signal received power (RSRP) measurements of adjacent beams from multiple DL PRS resources, using configuration data that indicates spatial adjacency between these beams, allowing for more accurate position estimation by considering non-line-of-sight conditions and reducing the need for extensive resource transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional angle-of-departure positioning methods are used, then positioning can be performed, but accuracy is reduced due to physical interference and obstacles
Solution Approach 1:
The patent segments the positioning measurement process by separately measuring RSRP values for multiple individual beams (first beam, second beam, third beam, etc.) instead of treating them as a single aggregated signal. This segmentation allows the system to identify and weigh individual beam measurements, reducing the impact of physical obstacles that may block certain beams while leaving others clear.
Solution Approach 2:
The patent changes the measurement parameter from conventional angle-of-departure calculations to RSRP (Reference Signal Received Power) measurements of multiple beams. By measuring power levels of individual beams and using weighted averaging based on these measurements, the system adapts to varying channel conditions caused by physical obstacles, improving positioning accuracy in non-line-of-sight environments.
2Measurement precision
If multiple DL PRS resources are transmitted for positioning, then positioning accuracy can be improved, but transmission overhead increases significantly
Solution Approach 1:
The patent makes the DL PRS resources multi-functional by using the same reference signal resources for both conventional positioning measurements and the new RSRP-based multi-beam measurements. The configured DL PRS resources serve multiple purposes: providing timing information, enabling angle-of-departure calculations, and enabling RSRP measurements for obstacle mitigation, thereby reducing the need for additional dedicated transmission resources.
Solution Approach 2:
The patent uses a limited set of beams (e.g., three beams) rather than exhaustively measuring all possible beams in all directions. This partial action approach provides sufficient positioning accuracy improvement while keeping the measurement and transmission overhead manageable, avoiding the need to transmit and measure an excessive number of beams.
Data Source
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AI summary
A method includes receiving, at a user equipment, configuration data of a resource set. The configuration data indicates an association between a first resource and a second resource. The method further includes obtaining a first RSRP measurement and a second RSRP measurement of the first and second DL PRS resources, determining a value based on the second RSRP measurement, and transmitting the first RSRP measurement and the value to the TRP.