Priority-Based Inter-RAT Cell Reselection Algorithm
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Solution Overview
Problem
Existing inter-RAT cell reselection algorithms may select lower priority cells due to signal strength thresholds, leading to unnecessary reselection processes and inefficiencies in wireless communication systems.
Innovation Solution
A method and apparatus for priority-based inter-RAT cell reselection that checks for candidate cells with signal strengths above preset thresholds and extends the reselection duration only if a higher priority cell is available, ensuring direct selection of the highest priority cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cell reselection is based solely on signal strength thresholds, then cells meeting the threshold can be selected, but lower priority cells may be selected instead of highest priority cells
Solution Approach 1:
The patent applies preliminary action by pre-establishing priority relationships between different RATs (Radio Access Technologies) before cell reselection occurs. The system预先 determines which RAT should be selected over others based on network configuration and policy, then uses this pre-established priority information to guide the cell reselection process. This ensures that when multiple cells meet the signal strength threshold, the highest priority cell is automatically selected without requiring additional complex evaluation steps during reselection.
2Stability of the object's composition
If the reselection duration T_Reselection is extended to ensure stable selection, then selection stability improves, but the time to complete reselection increases
Solution Approach 1:
The patent uses preliminary action by pre-determining priority relationships between RATs before the reselection process begins. This pre-established priority information allows the system to immediately identify the target RAT without needing to extend the reselection duration to evaluate multiple candidates. The priority information is prepared in advance based on network configuration, enabling faster decision-making while maintaining stability.
Solution Approach 2:
The patent implements feedback mechanisms where the UE (User Equipment) reports measurement results and the network provides priority information based on these reports. This feedback loop allows the system to dynamically adjust reselection decisions using real-time information about signal strength and pre-configured priorities, enabling stable and timely cell selection without excessive duration extension.
Data Source
AI summary
A method and an apparatus for priority based inter-radio access technology (inter-RAT) cell reselection are provided. In the existing algorithm for priority based inter-RAT cell reselection, an inter-RAT cell whose signal strength is above a preset threshold for a given duration is considered as satisfying the cell reselection criteria and may become a candidate for cell reselection. In this case, among those cells whose signal strength is above the preset threshold, a cell that does not have the highest priority may be selected. To address the above problem, the reference time duration for cell reselection may be changed. The enhanced cell reselection algorithm selects a cell having the highest priority among cells whose signal strength is above a preset threshold. Hence, it is possible to prevent repetition of unnecessary cell reselection.