PRS Angle Configuration for Unambiguous Wireless Positioning
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Solution Overview
Problem
Current mobile communication systems face challenges in accurately aligning beams between user equipment (UE) and base stations for angle-based positioning due to ambiguities in interpreting and configuring angles related to positioning reference signals (PRS), which affects the accuracy of location measurements.
Innovation Solution
A method is proposed to configure angles related to PRS without ambiguity by using a first and second value to determine boundary values, based on global or local coordinate systems, for azimuth and zenith angles of arrival/departure, to improve beam alignment between UE and base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If angle information for PRS is configured without standardized definition, then flexibility in beam configuration is improved, but measurement precision deteriorates due to ambiguous interpretation of angle values between UE and base station
Solution Approach 1:
The patent applies parameter changes by standardizing the definition of angle parameters (azimuth angle and zenith angle) with specific reference directions and rotation senses. This resolves the ambiguity in angle interpretation between UE and base station while maintaining configuration flexibility through standardized parameter specifications.
2Ease of operation
If different angle definition methods are used by UE and base station, then ease of operation is improved for individual devices, but reliability deteriorates due to beam misalignment
Solution Approach 1:
The patent applies equipotentiality by establishing a common reference framework for angle definitions at both UE and base station. Both devices use the same reference direction (e.g., x-axis or y-axis) and rotation sense (e.g., counter-clockwise), creating equal operational conditions that eliminate beam misalignment caused by interpretive differences.
3Device complexity
If angle range configuration is ambiguous, then device complexity is reduced, but manufacturing precision deteriorates in terms of beam alignment accuracy
Solution Approach 1:
The patent defines specific parameter specifications for angle ranges with clear boundary conditions and reference points. This standardization reduces configuration complexity by providing explicit parameters while simultaneously improving beam alignment precision through unambiguous angle range definitions.
Data Source
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.