Inter-RAT Cell Reselection Using Signal Quality Offsets
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Solution Overview
Problem
In heterogeneous wireless communication networks with multiple radio access technologies, mobile stations face challenges in effectively performing cell reselection due to the lack of priority information from serving cells, leading to increased power consumption and potential service quality deterioration.
Innovation Solution
A method where a mobile station determines if priority information for the first radio access technology is provided, and if not, performs inter-RAT cell reselection based on measured values from the second radio access technology without considering its priority information, selecting cells with better signal quality by offsetting measured values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If priority-based inter-RAT cell reselection is performed, then cell reselection efficiency is improved, but the system requires priority information from the serving cell which may not be provided
Solution Approach 1:
The patent changes the cell reselection parameters by introducing measured value offsets (Qoffset) and hysteresis margins that allow the mobile station to perform effective cell reselection based on signal quality measurements even without priority information from the serving cell
Solution Approach 2:
The mobile station performs self-service by autonomously determining cell reselection based on its own measurements of neighboring cells and applying offset values, without requiring priority information from the serving cell
2Reliability
If the mobile station continuously measures signals in all searchable frequency bands for cell reselection, then cell quality is improved, but power consumption increases
Solution Approach 1:
The patent applies local quality by introducing offset values (Qoffset) that are specific to each neighboring cell, allowing the mobile station to prioritize measurements of cells with better signal characteristics while reducing unnecessary measurements of cells with poor signal quality
Solution Approach 2:
The mobile station performs partial measurements by only evaluating neighboring cells that meet certain signal quality thresholds after applying offsets, rather than continuously measuring all cells in all frequency bands
Data Source
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AI summary
An apparatus and method of performing cell reselection in a wireless communication system is provided. A mobile station determines whether first priority information for the first RAT is provided by the serving cell, and receives second priority information of a second RAT from the serving cell. The mobile station performs inter-RAT cell reselection based on the first and second priority information if the first priority information for the first RAT is provided. The mobile station performs cell reselection toward the second RAT based on measured values of cells of the second RAT without considering the second priority information if the first priority information for the first RAT is not provided.