Wireless Network Self-Optimization with Inter-RAT SHR Thresholds
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Solution Overview
Problem
Existing wireless communication systems face challenges in optimizing inter-RAT handovers and voice fallbacks, leading to inefficient network resource usage and connection failures, which are not adequately addressed by current Self-Organizing Network (SON) techniques.
Innovation Solution
A method and apparatus for self-optimization in wireless networks that involve a UE and network apparatus to manage inter-RAT handovers by determining thresholds for Successful Handover Reports (SHR) and voice fallback indications, enabling logging or skipping of SHR, and reporting Radio Link Failures (RLF) to enhance network performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If inter-RAT handover is performed without optimized threshold management, then handover speed is improved, but handover reliability deteriorates due to unnecessary handovers and connection failures
Solution Approach 1:
The network apparatus pre-configures threshold parameters for Successful Handover Reports (SHR) and voice fallback indications before handover execution. The UE evaluates these pre-set thresholds to determine whether to log or skip SHR, enabling proactive optimization of handover decisions before actual handover occurs, thus balancing speed and reliability
Solution Approach 2:
The system implements feedback mechanisms where the UE reports handover success/failure information and the network apparatus adjusts threshold configurations based on observed handover performance. This closed-loop feedback enables continuous optimization of handover reliability while maintaining efficient handover speed
2Measurement precision
If Successful Handover Report logging is performed for all handovers, then measurement precision is improved, but device complexity increases due to additional logging and reporting overhead
Solution Approach 1:
The system applies different logging qualities to different handover scenarios by evaluating threshold conditions. Successful Handover Reports are logged selectively based on whether configured thresholds are satisfied, rather than uniformly for all handovers. This local differentiation reduces unnecessary logging overhead while maintaining measurement precision for critical handover events
Solution Approach 2:
Instead of logging all handovers (excessive action), the system implements partial logging based on threshold evaluation. The UE determines whether to log SHR by checking if configured thresholds are met, performing logging only when necessary to achieve measurement objectives, thus reducing device complexity while maintaining adequate measurement precision
3Reliability
If voice fallback indication is implemented with RLF reporting, then connection reliability is improved, but information processing complexity increases
Solution Approach 1:
The system merges voice fallback indication handling with existing RLF reporting mechanisms. When a voice fallback indication is received, the UE leverages the established RLF reporting framework to report relevant information, combining multiple functions into a unified processing path. This integration improves connection reliability for voice services while avoiding the need for separate complex reporting systems
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. The method includes detecting whether a threshold configured for a SHR for an inter-RAT handover is satisfied when at least one of a first RRC message includes the threshold for the SHR and a mobility command includes the threshold for the SHR for the inter-RAT handover, and logging or skipping logging of the SHR for the inter-RAT handover when the threshold configured for the SHR for the inter-RAT handover is satisfied. In another embodiment, the method includes detecting a RLF during or after performing the inter-RAT handover when the mobility command includes the voice fallback indication, and logging an indicator indicating the mobility is for the voice fallback in a RLF report for the RLF during or after performing the inter-RAT handover.