Conditional Handover Configuration Update Mechanism
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Solution Overview
Problem
Current 3GPP Radio (NR) specifications do not adequately address the handling of target node configuration changes during conditional handovers, leading to uncertainty and inefficiency in network signaling and UE configuration management.
Innovation Solution
Proposed mechanisms include the source node informing candidate target cells of its updated configuration, allowing them to reconfigure delta CHO commands, and the UE storing baseline or updated source configurations to minimize network signaling and optimize memory usage, with options for delta command conversion and HO cancel mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the source node informs candidate target cells of its updated configuration during conditional handover, then the target node configuration accuracy is improved, but the network signaling overhead increases
Solution Approach 1:
The patent extracts only the necessary configuration information (delta configuration) that needs to be updated from the source node to candidate target cells, rather than transmitting complete configuration sets. This selective extraction reduces signaling overhead while maintaining configuration accuracy for conditional handover execution.
Solution Approach 2:
The source node proactively informs candidate target cells of configuration changes before the conditional handover is actually executed. This preliminary action ensures that target nodes have up-to-date configuration information ready, avoiding the need for additional signaling at the moment of handover execution.
2Measurement precision
If the UE stores baseline source configuration for delta command conversion, then the handover execution accuracy is improved, but the UE memory consumption increases
Solution Approach 1:
The UE creates and stores a copy of the baseline source configuration information locally. This copied baseline configuration enables the UE to accurately process and convert delta configuration commands received from the source node, ensuring precise handover execution while managing memory usage through selective storage of essential reference data.
3Reliability
If the source node sends updated configuration to candidate target cells during conditional handover, then the handover reliability is improved, but the network processing complexity increases
Solution Approach 1:
The source node performs configuration updates to candidate target cells in advance, during the conditional handover preparation phase. This preliminary action ensures that all configuration changes are propagated before handover execution, improving reliability without adding complexity during the critical handover moment.
Solution Approach 2:
The system extracts and transmits only the specific configuration elements that have changed, rather than retransmitting complete configuration sets. This reduction in information volume simplifies network processing while maintaining the reliability needed for accurate conditional handover execution.
Data Source
AI summary
An apparatus of a source Radio Access Network (RAN) node, a system, and a method. The apparatus includes one or more processors that configures a user equipment (UE) for a conditional handover of the UE from the source RAN node to a candidate target RAN node based on at least one of a first configuration of the source RAN node or conditions to be met for execution of the conditional handover; and in response to a reconfiguration of the source RAN node to a second configuration, configure the UE for the conditional handover to the candidate target RAN node based on the second configuration by causing transmission of a message to the UE including information based on the second configuration.