Beam-Based Communication with Multi-TRP Handover Control
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Solution Overview
Problem
Beam-based communication systems using high-frequency bands face frequent blockage and deterioration of communication quality due to obstacles, leading to increased beam switching and handover frequencies, which degrade link reliability.
Innovation Solution
A method and apparatus for improving communication reliability by implementing multi-connectivity, where a terminal measures beam values, identifies optimal beams and TRPs, and performs handover or beam switching based on predefined conditions, using criteria such as TRP classification, measurement values, and beam search space adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beam-based communication is used in high frequency bands, then transmission speed is improved, but communication reliability deteriorates due to frequent blockage and obstacles
Solution Approach 1:
The terminal performs measurement on a plurality of beams from multiple TRPs in advance and identifies candidate beams before handover is needed. By pre-measuring and pre-identifying alternative beams, the system prepares backup communication paths ahead of time, enabling faster recovery when blockage occurs and reducing the frequency of reactive beam switching.
Solution Approach 2:
The patent introduces a handover determination value that combines the minimum serving beam measurement value with an offset parameter. By adjusting this composite parameter, the system controls the sensitivity of handover triggering, reducing unnecessary beam switching while maintaining reliability. The offset parameter allows flexible tuning of the handover threshold to match specific communication environment requirements.
2Reliability
If beam switching and handover occur frequently to maintain communication quality, then communication stability is reduced, but link reliability should be improved
Solution Approach 1:
The terminal continuously monitors measurement values of serving beams and compares them against the handover determination value. This feedback mechanism triggers handover only when the minimum measurement value plus offset falls below the determination value, providing a controlled response to degradation rather than frequent switching. The system adjusts beam selection based on real-time measurement feedback while maintaining stability through threshold-based decision making.
Solution Approach 2:
By pre-calculating the handover determination value using the minimum serving beam measurement value and an offset, the system establishes a stable threshold before handover is triggered. This preliminary calculation creates a buffer zone that prevents frequent, minor fluctuations from causing unnecessary beam switching, thereby stabilizing communication while maintaining reliability.
3Measurement precision
If multiple beams from multiple TRPs are measured and evaluated, then beam selection accuracy is improved, but system complexity increases
Solution Approach 1:
The patent divides the beam measurement process into distinct segments: measuring multiple beams from multiple TRPs, identifying the minimum serving beam measurement value, calculating the handover determination value with offset, and comparing against candidate beams. This segmentation of the measurement and decision process makes the complex multi-TRP evaluation more manageable and implementable while maintaining measurement precision.
Solution Approach 2:
The system transforms the complex multi-dimensional evaluation of multiple beams from multiple TRPs into a simplified comparison by introducing the handover determination value parameter. Instead of evaluating all possible beam combinations, the system converts the problem into comparing candidate beams against a single determined threshold value, reducing computational complexity while preserving measurement accuracy.
Data Source
AI summary
An operation method of a terminal in a communication system may comprise: obtaining a plurality of serving beam measurement values by performing measurement on a plurality of serving beams; identifying a minimum measurement value among the plurality of serving beam measurement values; obtaining a plurality of beam measurement values by performing measurement on a plurality of beams received from a plurality of base stations included in the communication system; determining whether a first condition is satisfied, the first condition being defined based on a result of comparison between the plurality of beam measurement values and a sum of the minimum measurement value and a first offset; and in response to determining that the first condition satisfied, performing communication with at least part of the plurality of serving base stations and a first base station forming a first beam satisfying the first condition.