Smart IRAT VoLTE Mobility Handover Control
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Solution Overview
Problem
Current VoLTE systems face challenges in seamless handover processes due to the lack of load-based and priority checks before initiating handovers to target cells, leading to high call drop rates and poor user experience.
Innovation Solution
A system that determines whether to perform measurement-based or blind-based handovers based on critical coverage conditions, using a conditional parameter to evaluate load conditions and priority of target cells, and implements a configurable timer to defer context release commands, thereby improving VoLTE call retention and reducing call drop rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If measurement-based handover is performed based on UE measurement reports, then handover decisions can be made with coverage information, but the system fails to check load condition and priority of target cells before handover
Solution Approach 1:
The system performs preliminary load condition checks and priority evaluations of target cells before initiating handover. The serving cell evaluates the load condition of the target IRAT cell and determines handover eligibility based on pre-configured thresholds, ensuring that handover decisions are made only when the target cell can accommodate the UE.
Solution Approach 2:
The system implements feedback mechanisms where the serving cell continuously monitors measurement reports from UEs, evaluates target cell load conditions, and adjusts handover decisions based on this feedback. The system also provides feedback to UEs regarding handover eligibility and initiates appropriate handover procedures based on the evaluated conditions.
2Speed
If blind-based handover is performed to a preconfigured neighboring cell, then handover can be initiated quickly, but the system does not evaluate load condition of target cell leading to high call drop rates
Solution Approach 1:
The system performs preliminary load condition evaluations of target cells before initiating blind handover. The serving cell checks whether the target IRAT cell's load condition meets pre-configured thresholds and determines handover eligibility in advance, ensuring that quick handover execution does not compromise call retention.
Solution Approach 2:
The system dynamically adjusts handover behavior based on real-time load conditions of target cells. When load conditions are favorable, blind handover is permitted for quick execution; when load conditions are unfavorable, the system switches to measurement-based handover or denies handover, thereby maintaining call retention while preserving execution speed when possible.
3Productivity
If handover is initiated without checking target cell load condition, then handover process is simple and fast, but call drop rates increase due to poor user experience
Solution Approach 1:
The system performs preliminary load condition checks of target cells before initiating handover. The serving cell evaluates whether the target IRAT cell can accommodate additional UEs based on pre-configured load thresholds, ensuring that handover processing remains efficient while preventing call drops caused by target cell overload.
Solution Approach 2:
The system enables target cells to self-manage their load conditions by comparing actual load against pre-configured thresholds. Target cells can autonomously determine their handover eligibility and communicate this information to serving cells, reducing the signaling overhead and maintaining high processing efficiency while preventing call drops.
Data Source
AI summary
A system, method, and computer program product are provided for smart inter-Radio Access Technology (IRAT) Voice over Long-Term Evolution (VoLTE) mobility. In operation, a serving cell receives an indication of poor coverage from user equipment (UE) during an active call. The serving cell determines to initiate an inter-Radio Access Technology (IRAT) handover process if the coverage for the UE has become worse than a threshold value. The serving cell identifies at least one parameter (e.g. CovTriggerdBlindHoAllowed) indicating a conditional state in which selection between a measurement-based handover and a blind-based handover for the IRAT handover process is based on a critical condition threshold. The serving cell selects between the measurement-based handover and the blind-based handover for the IRAT handover process, as a result of identifying the conditional state of the parameter.