SCG-Maintained Conditional Handover in Dual Connectivity
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Solution Overview
Problem
Current cellular communication systems face challenges in managing radio link failures during conditional handovers, particularly in scenarios where the secondary cell group configuration remains unchanged, leading to unnecessary re-initiation of secondary node addition processes, which introduces delays in network reconfiguration.
Innovation Solution
Incorporating an indicator in the RRC reconfiguration process that the secondary cell group remains the same after conditional handover execution, along with parameters controlling the reporting of radio link failures, allowing the user equipment to determine whether to access the secondary cell group after handover has begun, thereby avoiding re-initiation of secondary node addition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the user equipment reports radio link failure at the secondary cell group before conditional handover execution, then the network can detect and respond to the failure, but it causes unnecessary re-initiation of secondary node addition processes and introduces delays
Solution Approach 1:
The network pre-configures the user equipment with parameters controlling radio link failure reporting behavior before conditional handover execution. This preliminary configuration allows the UE to understand when reporting is appropriate, preventing unnecessary failure reports that would trigger redundant secondary node addition processes and cause delays.
Solution Approach 2:
The network provides feedback to the user equipment through configuration parameters indicating whether radio link failure should be reported at the secondary cell group. This feedback mechanism enables the UE to adjust its reporting behavior based on network conditions and handover state, avoiding unnecessary failure reports during conditional handover scenarios where the secondary cell group remains unchanged.
2Reliability
If the network re-initiates secondary node addition processes in response to radio link failure reports, then it ensures proper network reconfiguration, but it introduces unnecessary delays when the secondary cell group configuration remains the same
Solution Approach 1:
The network performs preliminary assessment during conditional handover preparation to determine whether the secondary cell group will remain unchanged. Based on this preliminary action, it pre-configures the UE with appropriate parameters to control failure reporting, preventing unnecessary re-initiation of secondary node addition processes that would slow down handover execution.
Solution Approach 2:
The network changes the reporting behavior parameter of the user equipment based on the handover scenario. When the secondary cell group remains unchanged, the parameter is set to suppress failure reports, allowing faster handover execution without compromising network reconfiguration reliability.
3Reliability
If the user equipment continuously monitors and reports radio link status, then the network maintains awareness of link conditions, but it increases signaling overhead and processing complexity
Solution Approach 1:
The network applies different monitoring and reporting rules to different parts of the communication system based on local conditions. Specifically, it configures the UE to monitor radio link status continuously but to report failures only under specific conditions (when the secondary cell group changes or when explicitly required), reducing unnecessary signaling while maintaining reliability.
Solution Approach 2:
The network dynamically changes the reporting control parameters of the UE based on the handover phase and secondary cell group configuration status. This parameter adjustment allows the system to maintain simple monitoring operations while controlling the complexity of failure reporting through conditional logic.
Data Source
AI summary
Techniques of configuring and executing CHO include including in a RRC reconfiguration of the UE, during a CHO configuration process in which a PSCell is unchanged, include (i) an indicator indicating that the secondary cell group (SCG) remains the same after the CHO has been executed and (ii) a value SCG and determining whether a user equipment (UE) should attempt to access the SCG after execution of the CHO has begun.