PCell Handover Signaling With Conditional PSCell Addition
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently handling conditional primary secondary cell (PSCell) addition (CPA) configurations during handover procedures, particularly when combined with normal handover, dual active protocol stack (DAPS) handover, or conditional handover (CHO), as they do not effectively integrate CPA configuration with target cell information or CHO configuration.
Innovation Solution
A method and apparatus that enable user equipment (UE) to receive configuration signaling for both target PCell and candidate PSCells, evaluating CPA and CHO execution conditions, and perform handover procedures, including RACH or RRC re-establishment based on predefined criteria to ensure successful handover and data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CPA configuration is integrated with target cell information or CHO configuration during handover preparation, then the reliability of SN addition procedure is improved, but the device complexity increases
Solution Approach 1:
The patent combines CPA configuration with target cell information or CHO configuration into a single integrated configuration structure. The configuration includes both the target PCell parameters and multiple candidate PSCells with their respective CPA execution conditions, allowing the UE to process handover and conditional PSCell addition simultaneously through unified evaluation logic.
Solution Approach 2:
The integrated configuration structure serves multiple functions: it provides target cell information for handover, contains candidate PSCell configurations for conditional addition, and includes execution conditions for both handover and CPA. This multi-functional configuration reduces the need for separate signaling messages and simplifies the overall handover procedure.
2Adaptability or versatility
If multiple candidate PSCells are configured with CPA execution conditions, then the adaptability of handover procedure is improved, but the difficulty of detecting and measuring increases
Solution Approach 1:
The configuration is segmented into distinct components: target PCell information, multiple candidate PSCell configurations, and their associated CPA execution conditions. Each candidate PSCell is independently configured with its own execution conditions, allowing the UE to evaluate them separately and select the appropriate PSCell based on measured conditions without overwhelming complexity.
Solution Approach 2:
All candidate PSCell configurations and their execution conditions are pre-configured during the handover preparation phase. The UE receives the complete configuration including multiple candidate PSCells with their respective conditions before executing the handover, allowing advance preparation and reducing real-time decision complexity.
3Productivity
If the UE evaluates CPA execution conditions during handover procedure, then the productivity of handover process is improved, but the loss of time increases
Solution Approach 1:
The UE continuously evaluates CPA execution conditions during the handover execution phase without interrupting the handover process. The evaluation of candidate PSCell conditions occurs concurrently with handover to the target PCell, allowing the UE to quickly identify and access alternative PSCells if needed, maintaining continuous useful action throughout the procedure.
Solution Approach 2:
The configuration of multiple candidate PSCells with their execution conditions is prepared in advance during handover preparation. This preliminary configuration allows the UE to perform rapid evaluation during handover execution without time-consuming setup, improving productivity while minimizing time loss.
Data Source
AI summary
The present application relates to a method and an apparatus for performing a handover procedure. One embodiment of the subject application provides a method, which includes: receiving a configuration signaling including first configuration information or second configuration information; determining a first target primary cell (PCell) based on the configuration signaling; and performing a handover procedure to the first target PCell.