Event-Based Handover Reporting for Ping-Pong and Link Quality
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Solution Overview
Problem
Existing wireless communication systems face issues with handover performance due to resource inefficiencies and deteriorated link quality caused by 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 performance by receiving and acting on detailed reports from terminals regarding specific handover events such as outage, ping-pong, and interruption times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conditional handover scheme is used to reduce handover failure probability, then handover reliability is improved, but resource efficiency deteriorates due to waste of reserved resources
Solution Approach 1:
The patent changes the handover triggering parameters by introducing event-based reporting conditions (A3 event with specific offset and time-to-trigger parameters) that dynamically adjust handover decision criteria based on actual radio conditions, allowing the system to reduce handover failures without unnecessarily reserving resources for all potential handovers
2Stability of the object's composition
If handover is delayed until target cell has significantly better radio channel condition, then ping-pong probability is reduced, but transmission rate deteriorates due to link state deterioration
Solution Approach 1:
The patent implements dynamic handover parameter adjustment where the source base station modifies handover parameters (such as handover margin, time-to-trigger, and event thresholds) based on real-time reporting from the terminal about radio link quality and handover performance, creating a adaptive system that balances ping-pong reduction with transmission rate maintenance
3Reliability
If handover parameters are adjusted based on event reporting, then handover performance is improved, but system complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the terminal monitors handover-related events (A3 event occurrences, radio link quality changes, handover execution outcomes) and reports them to the source base station, which then adjusts handover parameters based on this feedback. This closed-loop approach improves handover performance while keeping the adjustment logic centralized at the base station rather than distributed across multiple devices
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.