Cell Reselection Priority Handling for Wireless Devices
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Solution Overview
Problem
Wireless communications apparatuses often perform unnecessary cell reselection processes, leading to increased power consumption due to incorrect prioritization of signal strengths or evaluation times, resulting in inefficient cell reselection and potential 'ping-pong' effects between cells.
Innovation Solution
A communications apparatus and method that receive priority information from a network operator to directly select a target cell from a serving cell to a higher-priority cell without passing through intervening cells, by adjusting evaluation times and signal characteristics based on priority orders, thereby optimizing the cell reselection process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the communications apparatus performs cell reselection based on signal strength or priority order, then the apparatus can maintain service continuity, but the apparatus may perform unnecessary cell reselection processes leading to increased power consumption
Solution Approach 1:
The patent applies preliminary action by performing a prediction process before actual cell reselection. The communication apparatus predicts the target cell based on current cell information and measurement results, then performs reselection only when the prediction indicates a suitable target. This avoids unnecessary reselection processes and reduces power consumption while maintaining service continuity.
Solution Approach 2:
The patent implements feedback by using measurement results and cell information to continuously update the prediction of target cells. The apparatus monitors signal strengths, qualities, and other parameters, feeds this information back into the prediction algorithm, and adjusts reselection decisions accordingly. This feedback mechanism ensures reliable service continuity while minimizing unnecessary reselection operations that would increase power consumption.
2Reliability
If the communications apparatus performs frequent cell reselection to find better signal conditions, then the apparatus can improve service quality, but the apparatus may experience 'ping-pong' effects between cells reducing efficiency
Solution Approach 1:
The patent applies preliminary action by predicting the target cell before actual reselection occurs. The prediction process analyzes current cell measurements, signal trends, and historical data to determine whether a reselection is truly necessary and which cell would be the optimal target. This prevents unnecessary reselection operations that would cause ping-pong effects and improve reselection efficiency while maintaining service quality.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting evaluation criteria for cell reselection. Instead of using fixed thresholds, the system modifies prediction parameters based on current network conditions, signal characteristics, and cell priorities. This adaptive approach prevents premature or unnecessary reselections that would create ping-pong effects while ensuring high service quality when reselection is genuinely beneficial.
3Measurement precision
If the communications apparatus evaluates multiple candidate cells to ensure optimal selection, then the apparatus can improve reselection accuracy, but the apparatus increases evaluation time and processing complexity
Solution Approach 1:
The patent applies the taking out principle by extracting and prioritizing the most critical evaluation parameters from the full set of possible cell characteristics. Instead of evaluating all possible cell parameters equally, the system identifies and focuses on the most influential factors for reselection accuracy. This selective approach maintains high reselection accuracy while significantly reducing evaluation time and processing complexity.
Solution Approach 2:
The patent implements local quality by applying different evaluation strictness levels to different candidate cells based on their characteristics. High-priority cells or those with strongly favorable measurements undergo more rigorous evaluation, while cells with clearly inferior parameters are quickly dismissed. This differentiated approach optimizes reselection accuracy for promising candidates while minimizing time spent on unlikely options.
Data Source
AI summary
A method for performing a cell reselection process in a wireless communications system is provided. The method is used in a communications apparatus camping on a serving cell. The method includes: receiving priority information about a priority order of frequencies of candidate cells from a network operator; performing a cell reselection evaluation process to select a target cell from the serving cell and the candidate cells; and performing a cell reselection process from the serving cell to the target cell directly without passing through any intervening cell.