Cell Selection Method Using Positional Correction
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Solution Overview
Problem
In multilayer cellular radio networks, frequent cell switching occurs due to the reliance on reception quality parameters, leading to increased overhead and reduced communication quality, while setting lower thresholds for cell switching can result in prolonged stays in cells with degraded reception quality, affecting throughput and traffic forwarding time properties.
Innovation Solution
A user terminal equipped with a reception quality measuring, correcting, and determining system that takes into account the positional relationship and moving direction of the terminal to select the most suitable connection cell, thereby reducing cell switching frequency while maintaining communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cell selection is based only on reception quality parameters, then cell switching is triggered frequently to maintain quality, but overhead increases and communication quality deteriorates
Solution Approach 1:
The patent applies preliminary action by predicting future reception quality trends based on terminal movement direction and cell geometric relationships before actual quality degradation occurs. The terminal calculates whether it will exit cell coverage based on current position, movement velocity, and cell boundaries, triggering handover in advance or preventing unnecessary handovers by anticipating future conditions, thereby reducing frequent switching and associated overhead.
Solution Approach 2:
The patent implements dynamics by transitioning from static reception quality threshold-based handover to dynamic prediction-based handover. The system continuously updates handover decisions based on terminal movement state, cell geometric configuration, and predicted reception quality trends, allowing adaptive handover timing that reduces unnecessary switching while maintaining communication quality.
2Loss of energy
If lower threshold for BCH reception quality is set to reduce cell switching, then cell switching frequency decreases, but terminal stays too long in cells with degraded reception quality, degrading throughput
Solution Approach 1:
The patent applies preliminary action by predicting future reception quality trends before actual degradation occurs. The terminal calculates whether it will exit cell coverage based on current position, movement velocity, and cell boundaries. By anticipating future quality degradation or coverage loss, the system can proactively initiate handover before throughput severely degrades, or conversely, prevent premature handover by anticipating stable future conditions, thus optimizing the balance between switching frequency and quality maintenance.
Solution Approach 2:
The patent implements feedback by continuously monitoring actual reception quality against predicted trends and adjusting handover decisions accordingly. The system compares predicted future quality with actual measured quality and uses this feedback to validate or correct handover timing, ensuring that handover occurs only when necessary to maintain throughput while avoiding excessive switching.
3Reliability
If cell switching is frequent to maintain reception quality, then communication quality is maintained, but time property of traffic forwarding flow is degraded
Solution Approach 1:
The patent applies preliminary action by predicting future reception quality trends based on terminal movement direction and cell geometric relationships before actual quality degradation occurs. The terminal calculates whether it will exit cell coverage based on current position, movement velocity, and cell boundaries, triggering handover in advance or preventing unnecessary handover by anticipating future conditions, thereby reducing frequent switching and associated overhead.
Data Source
AI summary
In user terminal 10 of the present invention, connection-cell-selection controlling section 110 measures reception quality of signals respectively transmitted from cells and received by antenna section 108, corrects the reception quality of each of the cells based on a positional relationship between each of the cells and user terminal 10 and based on a moving direction of user terminal 10, and determines a connection cell for user terminal 10 (base station in communication with user terminal 10) based on the corrected reception quality. This configuration lowers a cell switching frequency, while preventing degradation of throughput and the like in a future radio communication system (multilayer cellular radio network).