Beam Quality Measurement for Wireless Cell Stability
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Solution Overview
Problem
Current methods for selecting beams for cell quality measurement in 3GPP wireless communication systems, such as the 'best beam', 'N best beams', 'all detected beams', and 'beams above a threshold' options, are not ideal as they lead to inconsistent and potentially inaccurate measurements, increasing the risk of ping-pong handovers and measurement reporting fluctuations.
Innovation Solution
A method involving measuring beam quality for each beam, identifying a group of N best beams, selecting a secondary group with beam quality better than or equal to the best within a preconfigured offset, and deriving cell quality based on these selected beams, while considering beam correlation and quality variations across cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single best beam is selected for cell quality measurement, then measurement complexity is reduced, but measurement accuracy and reliability deteriorate due to beam quality variations and ping-pong handovers
Solution Approach 1:
The patent combines multiple beam measurements (N best beams) into a unified cell quality measurement. Instead of relying on a single best beam, the system merges measurements from multiple beams to derive a more stable and accurate cell quality metric, reducing the impact of beam quality variations and ping-pong handovers.
Solution Approach 2:
The patent changes the measurement parameter from a single beam quality metric to a composite metric based on multiple beam measurements. By introducing new parameters such as the number of beams to measure (N) and the quality threshold offset, the system achieves more reliable cell quality assessment while managing complexity through configurable parameters.
2Measurement precision
If all detected beams are used for cell quality measurement, then measurement accuracy improves, but measurement complexity and processing overhead increase
Solution Approach 1:
The patent extracts only the N best beams from all detected beams for measurement purposes. Instead of processing all detected beams, the system identifies and selects the top N beams with the highest quality metrics, thereby maintaining measurement accuracy while significantly reducing processing complexity and overhead.
Solution Approach 2:
The patent segments the set of all detected beams into two groups: the N best beams selected for measurement and the remaining beams excluded from measurement. This segmentation allows the system to focus computational resources on the most relevant beams, achieving a balance between measurement accuracy and processing complexity.
3Stability of the object's composition
If beams above a threshold are selected for measurement, then measurement stability improves, but the selection process becomes more complex and requires additional configuration
Solution Approach 1:
The patent performs preliminary selection of the N best beams before applying the quality threshold filter. By first identifying the top N beams and then applying the threshold offset relative to the best beam quality, the system stabilizes measurements while minimizing configuration complexity. The preconfiguration of N and the offset value simplifies the overall selection process.
Data Source
AI summary
A method, performed by a communication device, including a) measuring a respective beam quality for each of a plurality of beams of a cell, b) identifying, within said plurality of beams, a first group of beams comprising a number, N, of beams, c) selecting, from within said first group of beams, a second group of beams comprising a number, M, of beams, and d) deriving a cell quality for the cell based on the measured beam qualities for the M beams of the second group.