Conditional PCell/PSCell Reservation for Faster 5G Handover
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Solution Overview
Problem
Existing 5G/NR communication systems face challenges in efficiently managing conditional primary cell (PCell) and secondary cell (PSCell) additions and changes, leading to increased signaling overhead and connection interruptions during handover procedures, particularly in scenarios involving fast UE movements.
Innovation Solution
Implementing enhanced conditional PCell/PSCell addition and change procedures by reserving and dynamically selecting candidate cells, allowing UEs to apply stored configurations without full reconfiguration, thereby reducing signaling overhead and enabling faster cell changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full reconfiguration is performed during handover procedures, then connection reliability is improved, but signaling overhead increases and connection interruptions occur
Solution Approach 1:
The patent applies preliminary action by pre-configuring candidate PCell/PSCell options with their associated configurations before handover is needed. The UE receives and stores multiple candidate cell configurations in advance, so when handover is triggered, the UE can immediately apply a pre-configured candidate without waiting for full reconfiguration messages, thereby reducing connection interruption time while maintaining reliability through pre-validated configurations.
2Productivity
If conditional PCell/PSCell addition and change procedures are implemented, then mobility performance is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the handover process into distinct phases: configuration phase where multiple candidate PCell/PSCell options are pre-configured with associated parameters, evaluation phase where the UE assesses execution conditions for each candidate, and execution phase where the appropriate candidate is selected and applied. This segmentation allows the UE to handle complexity in manageable stages rather than processing all handover decisions simultaneously, improving mobility performance while making the complexity tractable.
3Speed
If multiple candidate cells are reserved with full configurations, then handover speed is improved, but signaling overhead increases
Solution Approach 1:
The patent applies local quality by providing different levels of configuration detail for different candidate cells based on their specific needs and the UE's current state. Rather than providing identical full configurations for all candidates, the network can provide tailored configurations with only the necessary local modifications from the current configuration, reducing overall signaling overhead while maintaining handover speed by having pre-configured candidates ready for immediate deployment.
Data Source
AI summary
Methods and apparatuses for enhanced conditional PCell/PSCell addition and changes in a wireless communication system. A method of a UE comprises: receiving reservation information including an indication; determining, based on the indication, whether a candidate PCell/PSCell is reserved; storing, based on a determination that the candidate PCell/PSCell is reserved, the reservation information, CG information and one or more execution conditions associated with the reserved PCell/PSCell; retrieving, after performing a first UE operation, the stored CG information and one or more execution conditions associated with the reserved PCell/PSCell; determining whether one or more execution conditions are met for a reserved PCell/PSCell; and upon determination that one or more execution conditions are met, applying the stored the CG information of the reserved PCell/PSCell to a second UE operation.