UE Network Selection Using Dual Signal Thresholds
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently performing signal level-based network selection, particularly in determining appropriate signal thresholds for network selection, especially when dealing with public land mobile networks (PLMNs) with low signal strength but high priority, or high signal strength that is not expected.
Innovation Solution
A method and device for determining a signal threshold for network selection in a wireless communication system, using either a two-step or single threshold approach, which includes configuring two signal thresholds and selecting a first or second threshold based on consecutive timer expirations, and excluding PLMNs with low signal strength or unexpected high signal strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single signal threshold is used for network selection, then the network selection process is simple, but it cannot effectively exclude PLMNs with low signal strength or unexpected high signal strength
Solution Approach 1:
The patent divides the network selection process into two distinct stages: first evaluating signal strength against an initial threshold, then evaluating signal quality against a second threshold. This segmentation allows the system to handle both simple and complex selection scenarios effectively, resolving the contradiction between process simplicity and selection accuracy.
Solution Approach 2:
The patent introduces two different threshold parameters (first threshold for signal strength, second threshold for signal quality) instead of using a single threshold. By changing the evaluation parameter between stages, the system can accurately exclude PLMNs with low signal strength or unexpected high signal strength while maintaining a manageable selection process.
2Reliability
If a two-step threshold approach is used for network selection, then network selection accuracy is improved, but the network selection process becomes more complex
Solution Approach 1:
The patent segments the network selection process into two distinct evaluation stages, each with its own threshold criterion. This segmentation improves accuracy by considering both signal strength and signal quality, while the modular structure of the two-step process keeps the complexity manageable and organized.
Solution Approach 2:
The patent implements a dynamic two-step threshold mechanism where the first threshold is applied initially and the second threshold is applied subsequently based on the first evaluation result. This dynamic approach allows the system to adapt its evaluation criteria, improving accuracy while avoiding unnecessary complexity in cases where the first threshold is sufficient.
3Productivity
If signal level-based network selection is performed without proper threshold determination, then the selection process is fast, but PLMNs with low signal strength but high priority or high signal strength that is not expected cannot be excluded
Solution Approach 1:
The patent applies a preliminary first threshold evaluation for signal strength before proceeding to the second threshold evaluation for signal quality. This preliminary action quickly filters out PLMNs that clearly do not meet the minimum requirements, maintaining selection speed while preventing incorrect selections of PLMNs with low signal strength or unexpected high signal strength.
Solution Approach 2:
The patent changes the evaluation parameter from signal strength (first threshold) to signal quality (second threshold) in a sequential manner. This parameter change approach enables fast initial filtering while ensuring accurate final selection, resolving the contradiction between selection speed and accuracy.
Data Source
AI summary
A method of operating a node in a wireless communication system may comprise determining whether a terminal registered in a network is a first type terminal, determining terminal measurement information and measured cell information collection based on the terminal being the first type terminal, transmitting terminal measurement information and measured cell information collection indication to the terminal, receiving measurement information and measured cell information measured by the terminal, determining whether a signal threshold is used and the signal threshold based on the obtained measurement information and measured cell information, and transmitting the determined threshold to the terminal.