Handover from Fixed to Mobile Cell via Secondary Connection
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Solution Overview
Problem
In wireless communication systems, existing handover methods for user equipment (UE) to moving cells are inefficient, leading to unnecessary handovers and data disconnection, as they do not consider cell mobility and rely solely on signal quality without distinguishing between cells with and without the UE's physical association.
Innovation Solution
A method where the UE receives measurement configuration information from a fixed cell, sets a secondary connection with a moving cell, and performs handover by switching the secondary connection to primary when the moving cell's signal quality is consistently better than the fixed cell's, considering the UE's movement trajectory and mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If handover is performed based solely on signal quality measurement, then handover decision is simple and fast, but unnecessary handovers occur leading to data disconnection and reduced reliability
Solution Approach 1:
The system performs preliminary measurement of multiple cells before handover occurs. The UE measures signal quality of the serving cell and neighboring cells in advance, and the network stores these measurement results. When handover becomes necessary, the pre-measured data is immediately available, enabling fast decision-making without requiring real-time measurement at the moment of handover, thus resolving the contradiction between speed and reliability
Solution Approach 2:
The system implements feedback mechanisms where the UE reports measurement results to the network, and the network uses this feedback information to make informed handover decisions. The measurement configuration information and measurement report conditions create a closed-loop feedback system that ensures handover occurs only when truly necessary, preventing unnecessary handovers while maintaining fast response through efficient feedback processing
2Measurement precision
If the UE measures and reports measurement results frequently, then the network has accurate real-time information for handover decisions, but the UE consumes more energy and system resources
Solution Approach 1:
Instead of continuous measurement, the system uses periodic measurement with configurable intervals. The network can set measurement report conditions that trigger measurements at specific intervals or when certain thresholds are met. This periodic approach provides sufficient measurement data for accurate handover decisions while significantly reducing energy consumption compared to continuous measurement, resolving the contradiction between measurement precision and energy efficiency
Solution Approach 2:
The system dynamically adjusts measurement parameters based on network conditions and UE state. The measurement report conditions can be configured with different thresholds, intervals, and triggers adapted to current network load, UE mobility patterns, and signal conditions. This parameter adaptation allows the system to maintain measurement precision when needed while reducing measurement frequency and energy consumption during stable conditions
3Device complexity
If handover is performed without considering cell mobility and UE movement trajectory, then handover process is simple, but the UE may connect to cells that do not match its movement pattern causing frequent disconnection
Solution Approach 1:
The system introduces dynamic consideration of cell mobility and UE movement trajectory into the handover process. The network now accounts for whether cells are stationary or moving, and whether the UE is on a moving vehicle, to determine appropriate handover behavior. This dynamic adaptation maintains relatively simple handover procedures while significantly improving connection continuity by matching handover decisions to actual movement patterns, resolving the contradiction between complexity and reliability
Data Source
AI summary
According to one embodiment of the present invention, a user equipment performs handover from a fixed cell to a moving cell by receiving, from the fixed cell, measurement configuration information containing measurement report conditions on the moving cell, if the measurement results on the moving cell satisfy the measurement report conditions, reporting, to the fixed cell, the measurement results on the moving cell, configuring a secondary connection in the moving cell in addition to a primary connection in the fixed cell, releasing the primary connection in the fixed cell and switching secondary connection in the moving cell to a new primary connection.