Conditional Handover CHO Cancellation Avoidance via RRC Feature Comparison
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Solution Overview
Problem
In dual connectivity wireless networking, conditional handover procedures face challenges due to inconsistencies in radio resource control (RRC) configurations during secondary cell group reconfigurations, leading to potential cancellations or re-initializations of ongoing handovers, which can disrupt service and affect user equipment configurations.
Innovation Solution
An apparatus and method that receive a list of RRC configuration features from a target secondary node indicating which changes require cancellation or re-initialization of the conditional handover procedure, and compare this list with information about the secondary cell group reconfiguration to determine whether to cancel or maintain the handover, using bitmaps to map features and generate indications for the source master node.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SCG reconfiguration is performed during CHO procedure, then network configuration flexibility is improved, but CHO procedure stability deteriorates due to potential cancellation or re-initialization
Solution Approach 1:
The patent applies preliminary action by pre-configuring the UE with a list of RRC configuration features that require CHO cancellation or re-initialization before the actual reconfiguration occurs. This allows the UE to prepare the necessary comparison logic and data structures in advance, enabling rapid determination during SCG reconfiguration whether the CHO procedure should be canceled or maintained, thus maintaining stability while allowing flexibility.
Solution Approach 2:
The patent implements feedback by establishing a comparison mechanism where the UE continuously monitors SCG reconfiguration information against the pre-configured list of critical features. When reconfiguration occurs, the UE provides feedback by comparing the changed features with the list and determining whether CHO cancellation or maintenance is required, enabling dynamic adaptation while preserving procedural stability.
2Manufacturing precision
If CHO procedure is canceled or re-initialized during SCG reconfiguration, then configuration consistency is improved, but service continuity deteriorates
Solution Approach 1:
The patent applies local quality by differentiating between various RRC configuration features and identifying only the specific local features that require CHO cancellation or re-initialization. Instead of canceling the entire CHO procedure when any configuration change occurs, the system locally analyzes which specific features (e.g., cell identifiers, frequency configurations) are critical and only triggers cancellation/re-initialization for those specific cases, thereby maintaining service continuity while ensuring configuration consistency where needed.
3Measurement precision
If comprehensive comparison of all RRC features is performed, then configuration accuracy is improved, but processing time increases
Solution Approach 1:
The patent extracts the essential information by providing the UE with a pre-configured list of only the critical RRC configuration features that require CHO cancellation or re-initialization. Instead of requiring comprehensive comparison of all possible RRC features, the system extracts and focuses only on the relevant features (such as cell identifiers, frequency configurations, and other critical parameters), significantly reducing processing time while maintaining high configuration accuracy for the decisions that matter most.
Data Source
AI summary
There is provided an apparatus that includes at least one processor and at least one memory storing instructions. The instructions, when executed by the at least one processor, cause the apparatus at least to, receive a list of features of radio resource control (RRC) configuration, where the list is provided by a target secondary node (target SN) of a conditional handover (CHO) procedure, and where the list indicates, for each feature of the list of features of RRC configuration, whether a change in the respective feature requires cancellation or re-initialization of CHO; and, during the CHO procedure, based on information regarding a secondary cell group (SCG) reconfiguration for a source secondary node (source SN), compare the information with the list to determine whether the SCG reconfiguration requires cancellation or re-initialization of the CHO procedure.