Neighbor Cell List Management via Performance-Based Segmentation
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Solution Overview
Problem
The ANR function in LTE mobile communication systems faces delays and increased handover failure probabilities due to repeated additions and deletions of neighbor cells, and invalid or low-performing neighbor cells remaining in the Neighbor Relation Table, leading to system performance degradation.
Innovation Solution
Implementing a method to manage a neighbor cell list by classifying cells into allow and disallow lists based on handover statistical information, where cells with poor performance are disallowed for handovers and maintained for interference control and load balancing, while valid cells are prioritized.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the ANR function repeatedly adds and deletes neighbor cells in the NRT when the table is full, then the NRT maintains size within limits, but handover delay increases and handover failure probability increases
Solution Approach 1:
The patent segments the NRT into multiple groups (first group and second group) based on handover performance. Cells with poor handover performance are moved to the second group, while cells with good performance remain in the first group. This segmentation prevents repeated addition and deletion operations by maintaining a stable structure divided by performance criteria, thereby reducing handover delay and failure probability while keeping the overall NRT size within limits.
2Reliability
If the ANR function keeps all detected neighbor cells in the NRT, then the neighbor cell list remains comprehensive, but invalid or low-performing cells remain as handover targets increasing handover failure probability
Solution Approach 1:
The patent applies local quality by differentiating the status of individual cells within the NRT based on their handover performance. Each cell is evaluated and assigned to different groups (first group for good performance, second group for poor performance) rather than treating all cells uniformly. This allows the system to maintain comprehensiveness by keeping all detected cells in the NRT while improving reliability by preventing handovers to low-performing cells through group-based management.
3Productivity
If the NRT is maintained in a size full state, then storage efficiency is maximized, but repeated addition/deletion operations cause system performance degradation
Solution Approach 1:
The patent implements preliminary action by proactively moving cells with poor handover performance to the second group before they can cause handover failures. The base station monitors handover performance metrics and pre-classifies cells into performance-based groups, preventing future handover failures rather than reacting after failures occur. This maintains NRT management efficiency while improving handover reliability through advance classification.
Data Source
AI summary
An apparatus and method for efficiently manage a neighbor cell list in a mobile communication system. A method for operating a base station in a mobile communication system includes generating a neighbor cell list including at least one cell, including at least one cell among the at least one cell in a first list disallowing a handover, and disallowing a handover to the at least one cell included in the first list.