UE RSTD Reporting via Segmented PRS Processing
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately determining the location of User Equipment (UE) in environments with multiple cells, particularly in efficiently receiving and processing Positioning Reference Signals (PRS) to enhance positioning accuracy.
Innovation Solution
A method and apparatus for reporting Reference Signal Timing Difference (RSTD) values by UE in a wireless communication system, involving transmitting a random access preamble, establishing an RRC connection, receiving cell group identifiers and cell-independent information, detecting second PRS sequences, and reporting RSTD information to a location server, which allows for precise UE positioning even in environments with multiple cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE receives and processes Positioning Reference Signals (PRS) from multiple cells to improve positioning accuracy, then positioning precision is improved, but the processing complexity and time consumption increase
Solution Approach 1:
The patent divides the PRS processing into two distinct phases: a first PRS sequence processing phase for initial positioning and a second PRS sequence processing phase for refined positioning. This segmentation allows the UE to handle multiple cells systematically in stages, reducing the complexity burden at any single moment while still achieving high positioning accuracy through cumulative processing results.
Solution Approach 2:
The patent implements preliminary processing by first handling the first PRS sequence from a reference cell to establish baseline positioning parameters. This preliminary action prepares the UE's measurement resources and processing context before tackling the second PRS sequences from multiple other cells, thereby reducing the effective complexity of processing all cell signals simultaneously.
2Measurement precision
If the UE processes multiple PRS sequences from multiple cells to enhance positioning accuracy, then location determination precision is improved, but the time required for signal processing increases
Solution Approach 1:
The patent segments the PRS processing temporally into sequential phases: first processing the reference cell's PRS sequence, then processing multiple other cells' PRS sequences. This time-based segmentation allows the UE to complete measurements and calculations for each phase before transitioning to the next, managing processing time efficiently while maintaining high precision through comprehensive multi-cell analysis.
Solution Approach 2:
The patent performs preliminary processing of the reference cell's PRS sequence before processing other cells' signals. This preliminary action establishes the measurement baseline and prepares processing parameters in advance, reducing the time required for subsequent processing of multiple other cells while still achieving comprehensive location determination.
3Device complexity
If the system uses a single PRS sequence for positioning in multiple cells, then the positioning method is simplified, but positioning accuracy deteriorates
Solution Approach 1:
The patent makes the positioning method universally applicable to multiple cells by processing both a first PRS sequence from a reference cell and second PRS sequences from multiple other cells using a unified processing framework. This multi-functional approach maintains simplicity through consistent processing logic while achieving high accuracy by applying the same logic across multiple cell contexts with different PRS sequences.
Data Source
AI summary
Disclosed according to the present invention is a method for reporting a reference signal timing difference (RSTD) value by a terminal, in a wireless communication system. Specifically, the method may comprise: transmitting a random access preamble related to a synchronization signal/physical broadcast channel block (SS/PBCH block) received from a particular cell among multiple cells; requesting a radio resource control (RRC) connection to the particular cell on the basis of a random access response (RAR) received from the particular cell, to make establishment of the RRC connection to the particular cell; receiving, from a location server, a cell group identifier for a cell group including the multiple cells and independent cell information for each of the multiple cells; detecting second PRS sequences transmitted from the respective multiple cells on the basis of a first PRS sequence related to the cell group identifier; and reporting, to the location server, at least one piece of reference signal timing difference (RSTD) information acquired on the basis of the second PRS sequences and the independent cell information.