Quasi-Colocation Grouping for 5G Positioning Measurement Reduction
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G networks, face challenges in efficiently utilizing quasi-colocation relationships between neighboring cells for accurate positioning due to limitations in reporting and measuring reference signals, which affects the precision and speed of location determination.
Innovation Solution
A method where user equipment (UE) receives system information indicating quasi-colocation (QCL) relationships for neighboring cells and reports selected cells to a location server, allowing for the transmission of assistance data that includes identifiers of cells with common QCL relationships, enabling efficient measurement and positioning operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE measures reference signals from all neighboring cells, then the positioning measurement completeness is improved, but the measurement time and processing complexity increase
Solution Approach 1:
The patent segments the set of neighboring cells into multiple groups based on QCL relationships. The UE only needs to measure reference signals from one cell per group (the cell with the lowest cell ID), rather than measuring all neighboring cells. This segmentation reduces the measurement burden while maintaining positioning accuracy through geometric diversity.
Solution Approach 2:
The patent applies partial action by selecting a subset of neighboring cells for measurement based on QCL relationships. Instead of measuring all neighboring cells (excessive action), the UE measures only the necessary representative cells from each QCL group, achieving sufficient positioning information with reduced measurement overhead.
2Loss of information
If the system provides assistance data for all neighboring cells, then the positioning information completeness is improved, but the signaling overhead and processing complexity increase
Solution Approach 1:
The location server segments the assistance data by organizing it according to QCL groups of neighboring cells. Instead of providing separate assistance data for every neighboring cell, the server provides consolidated assistance data for representative cells from each QCL group, reducing signaling overhead while maintaining information completeness.
Solution Approach 2:
The patent merges assistance data for cells within the same QCL group. Since cells in a QCL group share common channel properties, the assistance data can be consolidated and represented through a single representative cell per group, reducing the overall signaling burden while preserving necessary positioning information.
3Measurement precision
If the UE reports all measured neighboring cells, then the positioning data completeness is improved, but the reporting overhead and processing complexity increase
Solution Approach 1:
The UE segments its measurement reports by organizing measured cells into QCL groups. Instead of reporting all measured neighboring cells, the UE reports only the representative cell from each QCL group (the cell with the lowest cell ID), reducing reporting overhead while maintaining positioning data completeness through the QCL relationship information.
Data Source
AI summary
Disclosed are techniques for wireless communication. In an aspect, a user equipment (UE) may receive system information for a plurality of neighboring cells in one or more system information block type 2 (SIB2) messages, one or more system information block type 4 (SIB4) messages, or both, the system information indicating at least an identifier and a quasi-colocation (QCL) relationship for each neighboring cell of the plurality of neighboring cells. The UE may report, to a location server, identifiers of one or more neighboring cells of the plurality of neighboring cells, the one or more neighboring cells selected from individual neighboring cells in one or more individual sets of neighboring cells of the plurality of neighboring cells, wherein the individual neighboring cells in each individual set of neighboring cells have a common QCL relationship with other individual neighboring cells in the individual set of neighboring cells.