Voice Fallback Handover Tagging in RLF Reports
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Solution Overview
Problem
Current radio link failure (RLF) reports in NR to LTE handovers do not differentiate between normal mobility-related handovers and voice fallback handovers, making it difficult for the network to optimize handover parameters effectively.
Innovation Solution
Enhance RLF reports with an indication that specifies whether the last completed handover was for voice fallback purposes, allowing the network to distinguish between different types of handovers and optimize mobility parameters accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RLF reports include detailed handover information, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts only the essential handover type indication (voice fallback or normal handover) from the complex RLF report, separating this critical information from other detailed measurements. This allows the network to identify handover type without requiring the UE to process and report all possible handover parameters, thus improving measurement precision while limiting device complexity increase.
Solution Approach 2:
The patent applies local quality by adding specific handover type indication fields only where needed in the RLF report structure (e.g., in connectionFailureType or dedicated handover information fields), rather than uniformly complicating the entire report. This targeted approach improves identification accuracy for voice fallback scenarios without unnecessarily increasing overall device complexity.
2Adaptability or versatility
If the network optimizes handover parameters for all scenarios, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent segments handover optimization into distinct categories: voice fallback handovers and normal mobility handovers. By identifying the handover type through the indication field, the network can apply different parameter optimization strategies for each category rather than attempting to optimize all parameters for all scenarios simultaneously, thus improving adaptability while reducing network configuration complexity.
Solution Approach 2:
The patent enables dynamic handover parameter optimization by allowing the network to adjust parameters based on the identified handover type. The system transitions from static, one-size-fits-all parameter configurations to dynamic, scenario-specific optimizations, improving adaptability while maintaining manageable complexity through automated type-based parameter selection.
Data Source
AI summary
Systems and methods are disclosed that relate to radio link failure reporting with an indication that indicates whether a last successfully completed handover was for voice fallback purposes. In one embodiment, a method performed by a User Equipment (UE) comprises receiving, from a first network node belonging to a first radio access technology, a configuration to perform a handover to a second network node belonging to a second radio access technology, the configuration comprising an indication that indicates that the handover is for voice fallback purpose. The method further comprises connecting to a cell served by the second network node and, responsive to declaring a radio link failure in the cell served by the second network node and the indication, storing information associated to the radio link failure in a report, the information comprising an indication that a last completed handover was for voice fallback purpose.