PRS Precoding Diversity for Indoor Positioning Accuracy
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Solution Overview
Problem
Current wireless communication systems face limitations in position estimation accuracy due to synchronization errors, multipath propagation, and measurement quantization, particularly in indoor environments, where conventional OTDOA schemes struggle to provide precise location information without increasing implementation complexity or battery consumption.
Innovation Solution
The method involves transmitting a positioning reference signal (PRS) with multiple precodings applied across consecutive subframes, allowing user equipment to measure and report high-quality reference signal time differences (RSTD) based on the best precoding, thereby improving timing accuracy through time, frequency, and spatial diversity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional OTDOA schemes are used for position estimation, then implementation complexity and battery consumption remain low, but position estimation accuracy deteriorates due to synchronization errors, multipath propagation, and measurement quantization
Solution Approach 1:
The patent segments the positioning reference signal transmission into multiple precoding instances across different subframes. Each precoding instance transmits PRS with a different precoding matrix, allowing the UE to measure and select the best measurement instance. This segmentation enables improved accuracy through diversity without requiring the entire system to process all instances simultaneously, thus managing complexity.
Solution Approach 2:
The patent applies partial action by having the UE measure multiple precoding instances but only report the best measurement instance (or a limited set of top instances) to the network. The UE performs measurements on all transmitted precoding instances but selectively processes and reports only the most relevant ones, achieving improved accuracy through comprehensive measurement while avoiding the complexity of processing and reporting all measurements in full detail.
2Measurement precision
If multiple precodings are applied to PRS to improve timing accuracy through diversity, then position estimation accuracy improves, but device complexity increases
Solution Approach 1:
The patent divides the PRS transmission into multiple segmented instances, each with a different precoding matrix applied across consecutive subframes. This segmentation in the time and spatial domains allows the system to achieve diversity gain for improved timing accuracy while keeping each individual measurement instance relatively simple, thereby managing overall device complexity.
Solution Approach 2:
The UE autonomously measures multiple precoding instances and independently selects the best measurement instance based on signal quality metrics. This self-service approach allows the UE to improve its own timing accuracy through diversity without requiring complex network-side processing or coordination, thus improving accuracy while minimizing the complexity burden on network devices.
3Measurement precision
If multiple precodings are applied to PRS, then position estimation accuracy improves through time, frequency, and spatial diversity, but battery consumption increases
Solution Approach 1:
The patent implements partial action by having the UE measure all transmitted precoding instances but report only the best measurement instance (or a limited subset). This approach allows the UE to benefit from comprehensive diversity-based measurement for improved accuracy while minimizing the energy required for processing and reporting, as the UE does not need to process and report all measurements in full detail.
Solution Approach 2:
The patent extracts only the essential information (the best measurement instance) from the complete set of measurements taken across multiple precoding instances. By extracting and reporting only the most relevant measurement data, the system achieves improved positioning accuracy through diversity while minimizing the energy consumption associated with data processing and transmission.
Data Source
AI summary
One embodiment of the present invention relates to a method for performing, by a base station, observed time difference of arrival (OTDOA)-related operations in a wireless communication system, the method comprising the steps of: transmitting a positioning reference signal (PRS) to a terminal through a PRS positioning occasion to which at least two precoding processes are applied; receiving, from the terminal, OTDOA signal measurement information on the basis of the PRS; and positioning the terminal on the basis of the OTDOA signal measurement information.