UE Conditional Handover Selection via RSRP Priority
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Solution Overview
Problem
In communication networks, the existing handover procedures in LTE and NR often fail to ensure reliable handover when radio conditions are poor, leading to potential loss of connectivity due to delayed or segmented handover commands, especially during conditional handover scenarios where multiple target cells may fulfill the conditions simultaneously, causing uncertainty in selecting the optimal target cell.
Innovation Solution
A method where the UE selects a target cell based on predefined parameters such as RSRP, RSRQ, SINR, or priority, allowing it to initiate handover when multiple candidate cells meet the conditional handover criteria, ensuring optimal connectivity by choosing the cell with the highest measurement values or most favorable conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network sends handover commands to the UE, then the handover procedure is initiated, but the commands may be delayed or segmented in poor radio conditions leading to connectivity loss
Solution Approach 1:
The network prepares and sends the handover command to the UE in advance, before the actual handover execution is needed. This preliminary action ensures that the UE already has the necessary handover configuration stored locally, eliminating delays caused by command transmission during poor radio conditions and preventing connectivity loss.
2Adaptability or versatility
If multiple target cells fulfill conditional handover criteria simultaneously, then the UE has multiple options, but uncertainty arises in selecting the optimal target cell
Solution Approach 1:
The network provides feedback to the UE by including priority information for each candidate target cell in the conditional handover configuration. This feedback mechanism enables the UE to clearly identify and select the optimal target cell based on the provided priority indicators, resolving the uncertainty that arises when multiple cells meet the handover criteria.
3Ease of operation
If the UE waits for network handover decisions, then network control is maintained, but handover execution is delayed in poor radio conditions
Solution Approach 1:
The network pre-configures conditional handover commands with multiple candidate target cells and their priorities before the UE needs to execute handover. This preliminary preparation enables the UE to autonomously and immediately select and execute handover to the most suitable target cell when conditions are met, speeding up execution while maintaining connection reliability through pre-validated options.
Data Source
AI summary
The present disclosure relates to a method performed by a UE for initiating handover of the UE from a source cell to a target cell. The UE selects, based on at least one parameter, a target cell from multiple candidate target cells. Each candidate target cell of the multiple candidate target cells fulfills a handover criterion. The UE initiates handover of the UE from the source cell to the selected target cell.