Wireless Positioning Reference Signaling for Carrier Phase Errors
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in performing wireless signal transmission and reception procedures, particularly in accurately determining the location of user equipment (UE) using carrier phase measurement (CPM)-based positioning methods, where initial phase errors and varying channel characteristics complicate precise positioning.
Innovation Solution
The introduction of a positioning reference unit (PRU) with known location, which performs measurements and reports phase measurements for all reference signal resources, including those with measurement failures, using modulo operation expressions and carrier phase measurements to correct errors, and supports various measurement types like ToA, TDOA, ScPM, AoD, and AoA.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If carrier phase measurement-based positioning is performed, then positioning precision is improved, but initial phase errors and varying channel characteristics cause measurement accuracy to deteriorate
Solution Approach 1:
A positioning reference unit (PRU) is introduced as an intermediary device with known location to perform measurements and provide reference phase information. The PRU acts as a mediator between the target UE and the network, enabling error correction by comparing measurements from the PRU with those from the target UE, thereby resolving the contradiction between achieving high positioning precision and maintaining measurement reliability in the presence of initial phase errors and channel variations
Solution Approach 2:
The system implements feedback mechanisms where the PRU reports phase measurements and measurement failures to the network. The network uses this feedback information to correct phase measurement errors for target UEs. The feedback loop includes transmitting device capability information, receiving configuration information, performing measurements, reporting results including failure information, and using this information for error correction, thereby maintaining measurement reliability while achieving high positioning precision
2Loss of information
If measurement reporting is performed for all reference signal resources, then measurement completeness is improved, but system complexity increases due to handling measurement failures
Solution Approach 1:
The measurement reporting process is segmented into different components: capability information transmission, configuration information reception, measurement performance, and structured measurement reporting. Each reference signal resource is handled as a separate measurable entity, and measurement failures are segmented and reported individually with specific failure causes. This segmentation allows comprehensive measurement coverage while managing system complexity through organized, modular processing of measurement data and failure information
3Measurement precision
If device capability information and configuration information are exchanged, then positioning accuracy is improved, but signaling overhead increases
Solution Approach 1:
The system exchanges capability information and configuration information selectively rather than continuously. The PRU transmits capability information indicating its positioning reference unit functionality, and the network provides configuration information only when needed for specific measurement tasks. This partial action approach ensures positioning accuracy is maintained when required while minimizing signaling overhead by avoiding unnecessary information exchange during normal operation
Data Source
AI summary
A method for a first apparatus to perform positioning-related measurement in a wireless communication system according to at least one of the examples disclosed herein may involve: transmitting apparatus capability information informing that the first apparatus can operate as a positioning reference unit (PRU) providing a positioning reference location; receiving configuration information about measurement that the first apparatus is to perform as the PRU; and reporting, to a network, the measurement performed by the PRU on the basis of the configuration information, wherein measurement reporting is performed for all of the reference signal resources included in the configuration information on the basis that the first apparatus operates as the PRU, and the measurement reporting for all of the reference signal resources includes information about reference signal resources for which measurement failed.