Beam Measurement Reporting for Accurate Downlink AOD Estimation
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Solution Overview
Problem
Existing angle-based positioning technologies, such as those using downlink angle of departure (DL-AOD), suffer from low estimation precision due to the reliance on reference signal received powers (RSRPs) for measurement reporting, which affects the accuracy of downlink angle estimation and subsequent positioning precision.
Innovation Solution
Incorporating channel phases and channel matrices into the measurement reporting method, alongside RSRPs, to enhance the estimation of downlink angles of departure (AODs) by providing additional information for network devices to improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only reference signal received powers (RSRPs) are reported for measurement, then the reporting quantity is small and signaling overhead is low, but the estimation precision of downlink angle is insufficient
Solution Approach 1:
The patent combines multiple measurement parameters (RSRP, channel phase, and channel matrix) into a unified measurement reporting framework. By merging these different types of information that characterize the reference signal reception from multiple directions, the system achieves more accurate downlink angle estimation while maintaining efficient signaling through structured reporting formats.
Solution Approach 2:
The patent introduces additional measurement parameters (channel phase and channel matrix) beyond the traditional RSRP metric. This parameter expansion transforms the measurement space from scalar power values to include complex channel characteristics, enabling more precise angle estimation through enhanced information content in the reported measurements.
2Measurement precision
If additional measurement information (channel phases and matrices) is reported, then AOD estimation accuracy is improved, but the reporting quantity and signaling overhead increase
Solution Approach 1:
The patent segments the measurement reporting into distinct components: RSRP values, channel phase information, and channel matrix data. Each segment serves a specific purpose in the angle estimation process, allowing the system to manage complexity through structured organization while maintaining the benefits of comprehensive measurement information.
Solution Approach 2:
The patent designs a universal measurement reporting structure that can accommodate multiple types of measurement information (power, phase, matrix) within a single framework. This multi-functional reporting mechanism serves both traditional signal quality assessment and advanced angle estimation purposes, reducing overall system complexity by unifying diverse reporting requirements.
Data Source
AI summary
A measurement reporting method and an apparatus, the method including receiving, from network devices, reference signals based on beams, obtaining measurement results by measuring the received reference signals, where the measurement results comprise reference signal received powers, receiving information about transmit beams from the network devices, and determining downlink angles of departure relative to the network devices based on the measurement results and the information about the transmit beams, where the information about the transmit beams includes at least one of characteristic information of the transmit beams or beam radiation mode information of the transmit beams.