Relay Node Conditional Handover in Cellular Networks
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Solution Overview
Problem
In cellular communication systems, existing handover methods can lead to communication disruptions due to rapid radio state degradation, and there is a need for more efficient management of relay nodes to prevent unnecessary handovers and optimize network topology.
Innovation Solution
A communication control method that includes a relay node receiving flow control feedback or failure occurrence notifications, allowing for conditional handovers to be executed after a predetermined period or upon persistent data packet transfer failures, thereby optimizing handover timing and reducing network disruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If handover is executed immediately upon detecting radio state degradation, then communication continuity is improved, but unnecessary handovers increase and network stability deteriorates
Solution Approach 1:
The system performs preliminary evaluation of handover conditions by checking multiple criteria (radio state degradation threshold, data transfer failure count, time elapsed since last handover) before executing handover. This preliminary action filters out transient failures and prevents unnecessary handovers while maintaining communication continuity for genuine failures.
Solution Approach 2:
The system implements feedback mechanisms by monitoring data transfer outcomes and using them to adjust handover decisions. When data transfer fails, the system counts failures and evaluates whether to trigger handover based on accumulated feedback, preventing premature handovers due to temporary issues.
2Stability of the object's composition
If conditional handover is executed after a certain period, then handover timing is optimized and network topology stability is improved, but data packet transfer delay increases
Solution Approach 1:
The system applies partial waiting by setting a configurable time period threshold that balances stability and delay. Instead of waiting for a fixed extended period, the system uses a optimized threshold that provides sufficient stability while minimizing delay, representing a partial action that achieves the optimal compromise.
3Measurement precision
If multiple handover conditions are monitored, then handover decision accuracy is improved, but system complexity and processing overhead increase
Solution Approach 1:
The system segments the handover decision process into distinct evaluable conditions: radio state degradation threshold, data transfer failure count threshold, and time elapsed since last handover. Each condition is independently monitored and evaluated, making the complex decision process manageable and modular while maintaining high accuracy.
Data Source
AI summary
In a first aspect, a communication control method is used in a cellular communication system. The communication control method includes receiving, by a relay node, a flow control feedback message or a failure occurrence notification message from a parent node of the relay node. The communication control method includes executing, by the relay node, a conditional handover in response to a certain period elapsing after receiving the flow control feedback message or the failure occurrence notification message.