PRS Angle-Range Configuration for Wireless Positioning Accuracy
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Solution Overview
Problem
Current mobile communication systems face challenges in accurately configuring PRS resources for angle-based measurements due to ambiguity in interpreting beam alignment between user equipment (UE) and base stations, leading to inaccurate position measurements.
Innovation Solution
A method is proposed to configure the angle and range of PRS resources unambiguously using a global or local coordinate system, applicable to DL-AoD, DL-TDOA, and Multi-RTT positioning methods, with configuration information transmitted via LTE positioning protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If angle information for PRS is configured using zenith angle or elevation angle definitions, then beam alignment between UE and base station can be achieved, but ambiguity in interpretation leads to inaccurate position measurements
Solution Approach 1:
The patent changes the parameter definition from ambiguous zenith/elevation angles to a standardized 3D coordinate system with explicit x, y, z components. This parameter transformation eliminates interpretation ambiguity by providing a unique, unambiguous representation of beam directions in three-dimensional space, allowing both UE and base station to interpret angle information consistently.
2Ease of operation
If beam alignment is configured using angle ranges with starting point or midpoint definitions, then PRS resource configuration can be established, but different interpretation methods cause misalignment between UE and base station
Solution Approach 1:
The patent transforms the beam alignment configuration from ambiguous angle range definitions (starting point or midpoint) to precise 3D coordinate parameters. By representing beam directions as explicit three-dimensional vectors with x, y, z components, the system eliminates interpretation differences between UE and base station, ensuring reliable and consistent beam alignment.
3Productivity
If search window information (expected RSTD and uncertainty) is transmitted to UE, then timing-related positioning measurement efficiency is improved, but this information is not helpful for angle-based measurement
Solution Approach 1:
The patent creates a universal 3D coordinate system framework that serves multiple positioning functions simultaneously. The same coordinate system can be used for both timing-related positioning (improving upon search window information) and angle-based positioning (adding new capability). This multi-functional approach allows the system to handle different positioning methods consistently without information loss.
Data Source
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AI summary
A method for a user equipment to transmit information for measurement of a positioning reference signal (PRS) in a wireless communication system according to an embodiment of the present disclosure, the method comprises receiving, from a location server, configuration information related to the PRS, receiving the PRS from a base station, and transmitting, to the location server, information for a measurement of the PRS. The configuration information includes information for an angle related to the PRS and the information for the angle related to the PRS includes i) a first value related to an expected angle and ii) a second value related to a range of the expected angle. A boundary value of the range of the expected angle is determined based on the first value and the second value.