Conditional PCell-PSCell Handover for Stable 5G Mobility
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing handover and conditional PSCell addition or change, leading to connection interruptions and slow processing during mobility changes in 5G/NR networks, particularly in scenarios involving fast UE movements.
Innovation Solution
A joint operation of conditional handover (CHO) and conditional PSCell addition or change (CPAC) is implemented, where UE evaluates execution conditions for both PCell and PSCell simultaneously, performs random access procedures, and applies configurations to minimize interruptions and enhance mobility management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate handover and PSCell addition procedures are used, then procedure simplicity is maintained, but connection interruptions and slow processing occur during mobility changes
Solution Approach 1:
The patent combines conditional handover (CHO) and conditional PSCell addition/change (CPAC) into a joint operation mechanism. The UE simultaneously evaluates execution conditions for both PCell handover and PSCell addition/change, and performs both procedures in an integrated manner. This merging of previously separate procedures enables faster processing and reduces connection interruptions during mobility changes, directly resolving the contradiction between processing speed and connection stability.
2Loss of time
If sequential evaluation of handover and PSCell conditions is performed, then processing complexity is reduced, but handover processing time increases
Solution Approach 1:
The network prepares and provides execution conditions for both PCell handover and PSCell addition/change in advance through configuration messages. The UE stores these pre-provided conditions and evaluates them simultaneously when triggered, rather than sequentially. This preliminary preparation of evaluation criteria enables parallel processing of both conditions, reducing overall handover processing time while maintaining manageable complexity through structured evaluation frameworks.
3Reliability
If joint evaluation of PCell and PSCell conditions is performed, then connection stability is improved, but UE processing complexity increases
Solution Approach 1:
The joint evaluation process is segmented into distinct components: PCell execution condition evaluation and PSCell execution condition evaluation. Each component is evaluated independently but simultaneously, with clear separation of evaluation criteria and execution procedures. This segmentation reduces the cognitive load on the UE processor by organizing complex multi-condition evaluation into manageable modules, while still achieving the reliability benefits of joint evaluation.
Data Source
AI summary
Methods and apparatuses a joint operation of conditional handover and conditional PSCell addition or change in a wireless communication system. A method of a UE comprises: receiving information including association information, execution conditions, and configurations for candidate PCells and candidate PSCells; evaluating the execution conditions for the candidate PCells and associated candidate PSCells simultaneously; upon the execution conditions for (i) a candidate PCell among the candidate PCells and (ii) a candidate PSCell associated with the candidate PCell are satisfied, determining that the candidate PCell and the associated candidate PSCell as a target PCell and an associated target PSCell, respectively; applying the configurations for the target PCell and the associated target PSCell; performing a random access procedure for the target PCell; and performing a random access procedure for the associated target PSCell.