LTM Target Cell Prioritization for Seamless UE Handover
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Solution Overview
Problem
In cellular networks, when a mobile device undergoes handover from one cell to another, the configuration mismatch between the source and target cells can lead to service interruptions and reduced quality, compromising user experience.
Innovation Solution
A method for prioritizing target cells for handover based on their configuration, considering factors like GBR allocation, PDU session to DRB mapping, carrier aggregation, slice mapping, and UE's accepted DRBs, to select a target cell that minimizes service interruption and quality degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple target cells are prepared for handover based on radio conditions, then handover options are increased, but configuration mismatches between serving and target cells cause service interruptions
Solution Approach 1:
The system performs preliminary configuration matching between serving cell and target cell before handover execution. The CU-CP compares configuration parameters (GBR allocation, PDU session mapping, carrier aggregation, slice mapping) of candidate target cells with the serving cell configuration, and prioritizes target cells with matching configurations to prevent service interruptions during handover
Solution Approach 2:
The system changes the handover selection criterion from solely radio-based conditions to a composite criterion that includes configuration similarity. By introducing configuration matching as a new parameter dimension, the system identifies target cells that not only meet radio quality thresholds but also maintain service continuity through configuration consistency
2Speed
If target cells are selected based on radio conditions alone, then handover speed is improved, but service quality is compromised due to configuration mismatches
Solution Approach 1:
The system performs preliminary configuration matching between serving cell and target cell before handover execution. The CU-CP compares configuration parameters (GBR allocation, PDU session mapping, carrier aggregation, slice mapping) of candidate target cells with the serving cell configuration, and prioritizes target cells with matching configurations to prevent service interruptions during handover
Solution Approach 2:
The system changes the handover selection criterion from solely radio-based conditions to a composite criterion that includes configuration similarity. By introducing configuration matching as a new parameter dimension, the system identifies target cells that not only meet radio quality thresholds but also maintain service continuity through configuration consistency
3Reliability
If configuration matching is performed for target cell selection, then service continuity is improved, but processing complexity increases
Solution Approach 1:
The system extracts the configuration matching function from the DU and centralizes it in the CU-CP. By separating the configuration comparison logic as an independent function at the central unit, the system reduces processing complexity at the distributed units while maintaining comprehensive configuration checking capability at the central control level
Data Source
AI summary
In general, the current subject matter relates to target cell prioritization for layer 1/layer 2 triggered mobility (LTM). In some implementations, target cell prioritization for LTM can include receiving, at a serving distributed unit (DU) of a base station from a centralized unit control plane (CU-CP) of the base station, information indicating a handover priority ranking of a plurality of Layer 1/Layer 2 triggered mobility (LTM) target cells of a second DU of the base station, and selecting, at the serving DU and based on the received information, one of the plurality of LTM target cells for handover of service for a user equipment (UE) from the serving DU, and triggering the handover of the service for the UE from the serving DU to the selected target cell. Each of the plurality of LTM target cells from which the serving DU selects satisfies handover criteria.