Conditional Handover Targeting with UE Radio Trajectory Prediction
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Solution Overview
Problem
Current cellular communication networks lack an effective method to identify suitable target cells for conditional handover with a safe look-ahead time, relying on resource-intensive configurations and imprecise UE positioning, which hinders the timely and efficient initiation of handovers.
Innovation Solution
A method and management node that utilize UE radio resource measurements to assign radio locations to zones in a multidimensional radio space, update UE trajectories, and calculate handover probabilities to neighbor cells, enabling precise initiation of conditional handovers based on probability thresholds and individual UE characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Conditional HandOver configuration is performed for all neighbor cells, then handover reliability is improved, but network resource consumption increases significantly
Solution Approach 1:
The patent extracts only the necessary subset of neighbor cells that are likely to be target cells for Conditional HandOver, rather than configuring all neighbor cells. This is achieved by determining UE trajectory and identifying neighbor cells along the predicted path, thereby reducing network resource consumption while maintaining handover reliability.
Solution Approach 2:
The patent performs preliminary determination of UE trajectory and pre-identifies potential target cells before handover is needed. By calculating the trajectory based on current position and movement direction, the system prepares the necessary handover configurations in advance, avoiding the need to configure all neighbor cells.
2Measurement precision
If precise UE positioning is performed continuously, then target cell prediction accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent applies partial positioning by determining only the essential trajectory information (current position and movement direction) rather than continuous precise positioning. This partial action provides sufficient accuracy for predicting target cells while avoiding the excessive processing complexity of continuous high-precision positioning.
Solution Approach 2:
The system performs preliminary trajectory determination using available positioning information to pre-identify potential target cells. This preliminary action provides adequate prediction accuracy without requiring continuous complex positioning calculations.
3Ease of operation
If existing ANR table is used for handover preparation, then system simplicity is maintained, but handover speed and robustness are insufficient
Solution Approach 1:
The patent introduces preliminary trajectory-based target cell identification that works in conjunction with the existing ANR table. By pre-determining the UE trajectory and identifying likely target cells in advance, the system accelerates handover preparation while maintaining compatibility with the simple ANR table structure.
Solution Approach 2:
The patent introduces trajectory information as an intermediary layer between the ANR table and handover execution. This intermediary provides direction-aware target cell selection, improving handover speed and robustness while the ANR table continues to provide the foundational neighbor cell information.
Data Source
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AI summary
A computer implemented method (200) is disclosed for managing Conditional Handover of a UE in a cellular communication network. The method comprises receiving a report of radio resource measurements performed by a UE (210) and assigning a current radio location of the UE to a radio zone of the communication network on the basis of the contents of the report (220). A radio zone comprises a region of a multidimensional radio space over which the communication network extends that is defined by a particular combination of radio field characteristics (220a). Each cell of the communication network comprises a plurality of radio zones. The method further comprises updating, in a database, a trajectory of the UE through the radio space of the communication network with the radio zone to which the current radio location of the UE is assigned (230), and using the updated trajectory to calculate a probability of Handover of the UE to neighbor cells of the current serving cell of the UE (240). The method further comprises initiating a Conditional Handover procedure for Handover of the UE to neighbor cells for which the probability of Handover is above a first Handover threshold value (250).