SUL Cell Reselection via Reception Level Parameters

The patent applies local quality by introducing SUL-specific minimum requirement reception level parameters (q-RxLevMinSUL) that are specifically tailored for supplementary uplink cells. Instead of using generic cell reselection parameters for all cell types, the invention creates specialized parameters for SUL cells, allowing optimized cell reselection behavior for this specific cell type while maintaining standard parameters for other cells. This resolves the contradiction by improving cell reselection efficiency for SUL cells without requiring complete redesign of the overall cell reselection mechanism.

The patent implements parameter changes by modifying the cell reselection evaluation criteria to incorporate dual connectivity status and SUL-specific reception level thresholds. The terminal device changes how it evaluates candidate cells by considering whether the cell supports SUL and adjusting the reception level requirements accordingly. This enables more efficient packet duplication control and cell reselection without requiring fundamental changes to the cell reselection framework, thus improving productivity while limiting complexity increase.

The patent applies segmentation by dividing cell reselection criteria into distinct categories: standard cell reselection parameters for conventional cells and SUL-specific parameters (q-RxLevMinSUL, s-Urah-ThresholdSUL) for supplementary uplink cells. This segmentation allows the system to apply appropriate criteria for each cell type, improving cell reselection performance for SUL cells while maintaining the simplicity of standard criteria for other cells. The terminal device can selectively apply the appropriate criterion set based on cell type identification.

The patent introduces local quality by creating specialized cell reselection parameters specifically for SUL cells, including minimum requirement reception level (q-RxLevMinSUL) and threshold parameters (s-Urah-ThresholdSUL). These localized parameters are applied only when evaluating SUL cells, ensuring optimal performance for this specific cell type without affecting the simplicity of cell reselection for conventional cells. This resolves the contradiction by improving reliability for SUL cells while limiting overall complexity through targeted rather than universal parameter changes.