Mobility Robustness Optimization Using Segmented Handover Counters
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Solution Overview
Problem
Current mobility robustness optimization methods in LTE networks fail to accurately address 'Handover to Wrong Cell' failures, as they cannot distinguish between different scenarios involving a third cell, leading to incorrect corrective measures and reduced effectiveness.
Innovation Solution
Introducing a method to provide neighbor relation information with separate counters for unsuccessful handovers and connection re-establishment attempts, allowing for precise identification and updating of candidate handover target cells, enabling targeted corrective actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single counter per neighbor relation is used to track handover to wrong cell failures, then the device complexity is reduced, but the measurement precision deteriorates because it cannot distinguish between different failure scenarios involving different third cells
Solution Approach 1:
The patent segments the single HWC counter into multiple counters, each associated with a specific third cell. This segmentation allows the system to track handover failures to different wrong cells separately, enabling precise identification of the specific failure scenario without increasing overall system complexity significantly.
2Measurement precision
If separate counters for different third cells are introduced to improve failure identification accuracy, then the measurement precision improves, but the device complexity increases due to multiple counters per neighbor relation
Solution Approach 1:
The patent adds a new dimension to the counter structure by introducing an association between counters and specific third cells. Instead of a flat single counter per neighbor relation, the system creates a multi-dimensional structure where counters are indexed by both neighbor relation and third cell, enabling precise tracking while maintaining systematic organization.
3Reliability
If centralized correction approach is used to evaluate all performance management data, then the reliability of correction measures improves, but the productivity decreases due to centralized processing bottleneck
Solution Approach 1:
The patent implements a feedback mechanism where the eNB autonomously monitors handover failures, identifies specific failure scenarios using the segmented counters, and automatically applies correction measures. This closed-loop feedback system enables the eNB to make real-time decisions without centralized processing delays, improving both response speed and reliability through local intelligence.
4Productivity
If autonomous eNB correction is implemented to improve response speed, then the productivity increases, but the reliability may deteriorate due to limited evaluation capability at eNB level
Solution Approach 1:
The patent enables the eNB to perform self-service by autonomously detecting handover failures, analyzing the specific failure scenario using the detailed counter information, and applying appropriate correction measures independently. This self-service capability allows the eNB to respond immediately to failures without waiting for centralized analysis, achieving both high speed and reliability through empowered local decision-making.
Data Source
AI summary
Methods, apparatus and computer program products are disclosed for enhancing mobility robustness optimization in self optimizing networks. Neighbor relation information indicating relations between a handover source cell and candidate handover target cell(s), each including a first counter indicating events of an unsuccessful handover of a user equipment from the handover source cell to one candidate handover target cell, and a second counter indicating events of connection re-establishment attempt of the user equipment to the candidate handover target cell after an unsuccessful handover to another cell. A first candidate handover target cell to which handover of the user equipment was unsuccessful and a second candidate handover target cell to which the user equipment has re-established a connection, out of the candidate handover target cells, are determined. The first counter and/or the second counter of the neighbor relation information concerning the determined first and second candidate handover target cells is updated.