Target eNodeB Handover Failure Detection and Power Adjustment
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Solution Overview
Problem
Current Mobility Robustness Optimization (MRO) procedures in wireless communication networks are limited in addressing handover failures, as they primarily focus on adjustments at the source eNodeB and do not effectively remedy issues caused by the target eNodeB or other cells providing undesired coverage areas, leading to handover failures such as too-early, too-late, wrong cell, and incomplete handovers.
Innovation Solution
The implementation of methods and apparatuses at the target eNodeB to detect handover failure events, determine if it is providing an undesired coverage area, and adjust its transmit power to alter this area, thereby improving handover reliability. This includes using a handover event detecting component, performance measurement component, performance analyzer, and transmit controller to autonomously or centrally manage adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current MRO procedures focus only on source eNodeB adjustments, then source cell handover parameters can be optimized, but target eNodeB caused handover failures cannot be remedied
Solution Approach 1:
The patent segments the MRO function into two independent components: source eNodeB MRO (existing) and target eNodeB MRO (new). The target eNodeB independently detects handover failure events and adjusts its own transmission parameters, allowing each eNodeB to optimize its specific contribution to handover success without being limited by centralized control
Solution Approach 2:
Instead of having the source eNodeB solely responsible for handover optimization, the patent inverts the approach by enabling the target eNodeB to detect failures and adjust its own parameters. This reversal allows the target eNodeB to directly address issues it causes, such as excessive coverage area leading to too-early handovers
2Productivity
If a cell provides extended coverage area, then more UEs can be served, but handover failures increase due to undesired coverage areas
Solution Approach 1:
The patent implements dynamic adjustment of transmission parameters based on real-time handover failure detection. The target eNodeB continuously monitors for failure events (too-early, too-late, wrong cell, incomplete handovers) and dynamically adjusts its transmit power or coverage area to eliminate the undesired coverage region causing failures, while maintaining adequate service capacity
Solution Approach 2:
The target eNodeB uses feedback from detected handover failure events to adjust its transmission parameters. By monitoring failure patterns and using this feedback to modify coverage area dynamically, the system resolves the contradiction between providing extended coverage and preventing handover failures caused by undesired coverage areas
Data Source
AI summary
The disclosure describes methods and apparatuses for handover-related measurements and events for power adaptation. The disclosure provides for management of an eNodeB for improving reliability of incoming handovers to a cell provided by the eNodeB. At least one handover failure event for an incoming handover to a cell provided by the target eNodeB is detected. The eNodeB or central entity determines that the cell is providing an undesired coverage area based on the at least one handover failure event. In response to determining that the cell is providing an undesired coverage area, the transmit power for the cell may be adjusted to alter the undesired coverage area. A performance measurement based on the at least one handover failure event may be used to evaluate the undesired coverage area. The incoming handover failure events may include incoming too-early handovers, incoming too-late handovers, incoming wrong cell handovers, and incomplete incoming handovers.