Terminal Handover Event Reporting for Reliable Cell Switching
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Solution Overview
Problem
Existing wireless communication systems face issues with handover performance due to resource inefficiencies and deteriorated link quality from conditional handover schemes, leading to increased handover failure probabilities and ping-pong effects, which degrade the perceived quality of terminals.
Innovation Solution
A method and apparatus that adjust handover parameters based on event reporting from terminals, including handover problems and radio link failure recovery issues, allowing base stations to optimize handover preparation and execution by receiving and acting on detailed reports from terminals regarding specific handover events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conditional handover scheme is introduced to reduce handover failure probability, then handover reliability is improved, but resource efficiency deteriorates due to waste of resources reserved for terminals that will not actually perform handover
Solution Approach 1:
The patent implements feedback mechanisms where terminals report handover problem occurrences and radio link failure recovery status to base stations. This feedback enables base stations to adjust handover parameters dynamically, optimizing the balance between handover reliability and resource efficiency by learning from actual handover outcomes and adjusting future handover decisions accordingly.
Solution Approach 2:
The patent modifies handover parameters such as handover margins, trigger conditions, and reporting thresholds based on observed handover problem types and frequencies. By changing these parameters dynamically rather than using fixed values, the system adapts to actual network conditions to reduce unnecessary resource reservation while maintaining reliable handovers.
2Stability of the object's composition
If conditional handover scheme allows terminal to perform handover when target cell has significantly better radio channel condition, then ping-pong probability is reduced, but transmission rate deteriorates due to deterioration of link state while maintaining connection with source cell
Solution Approach 1:
The patent introduces dynamic adjustment of handover trigger conditions and reporting thresholds based on real-time link state measurements. The system dynamically determines when to initiate handover reporting based on the actual degradation level of the source cell link, allowing the terminal to maintain connection as long as the link state remains acceptable while still triggering reports when necessary to prevent ping-pong effects.
3Reliability
If handover parameters are adjusted frequently to optimize performance, then handover quality is improved, but system complexity increases due to multiple handover problem types and reporting conditions
Solution Approach 1:
The patent segments handover problems into distinct types (e.g., handover failure, ping-pong handover, radio link failure recovery issues) with specific reporting conditions for each type. This segmentation allows the system to manage complexity by handling each problem type with dedicated logic and parameters, making the overall complex system more manageable and maintainable through modular problem classification.
Data Source
AI summary
An operation method of a terminal in a communication system may comprise: receiving a first occurrence reporting condition of a handover problem from a source base station; performing a handover from the source base station to a target base station; identifying whether a handover problem occurs based on the first occurrence reporting condition while performing the handover, and in response to identifying that a handover problem occurs, transmitting information indicating the occurrence of the handover problem to the target base station.