Multi-SCG Configuration for Conditional PSCell Change in 5G
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in improving mobility by efficiently managing primary and secondary cell group configurations, leading to increased latency and overhead during cell changes.
Innovation Solution
The implementation of multi-SCG configurations that allow user equipment (UE) to perform a sequence of primary secondary cell (PSCell) changes without full network reconfiguration after each change, by providing conditional configurations and delta configurations based on base SCG and MCG settings, enabling efficient PSCell change procedures and security handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full network reconfiguration is performed after each PSCell change, then communication reliability is maintained, but latency increases and mobility efficiency deteriorates
Solution Approach 1:
The network performs preliminary actions by pre-configuring multiple SCG configurations with different PSCells before the UE actually needs to change cells. The UE receives and stores these pre-configured SCG configurations (e.g., SCG configuration #1 with PSCell #1, SCG configuration #2 with PSCell #2) so that when a PSCell change is needed, the UE can immediately switch without waiting for full reconfiguration signaling, thus reducing latency while maintaining reliability through network-coordinated configuration management.
Solution Approach 2:
The patent segments the SCG configuration into multiple independent configuration sets, each associated with a specific PSCell. Instead of treating the entire network configuration as a single unit that must be reconfigured together, the system divides it into separate SCG configurations that can be independently selected and applied. This segmentation allows the UE to switch between PSCells by simply switching between pre-configured SCG configuration sets, eliminating the need for full reconfiguration and reducing latency.
2Reliability
If multiple PSCell changes are performed sequentially with full reconfiguration, then communication continuity is maintained, but overhead increases and mobility performance deteriorates
Solution Approach 1:
The network performs preliminary configuration of multiple SCG configurations in advance, storing them in the UE before actual PSCell changes are needed. This preliminary action eliminates the need for real-time reconfiguration signaling during mobility events, reducing overhead and simplifying the configuration management process while ensuring communication continuity through coordinated network-UE configuration management.
Solution Approach 2:
The patent creates a universal configuration management mechanism where a single set of pre-configured SCG configurations can serve multiple PSCell change scenarios. The UE stores multiple SCG configurations (e.g., for PSCell #1, PSCell #2, etc.) and can selectively apply any of them based on current network conditions, making the system versatile for various mobility scenarios without requiring separate reconfiguration procedures for each case, thus reducing overall complexity.
3Productivity
If conditional SCG configurations are provided for multiple PSCells, then mobility efficiency is improved, but configuration management complexity increases
Solution Approach 1:
The patent segments the configuration management task by organizing SCG configurations into distinct, labeled sets (e.g., SCG configuration #1 for PSCell #1, SCG configuration #2 for PSCell #2). Each segment is independently managed and can be selectively applied based on current network conditions. This segmentation approach, while increasing the number of configuration objects, actually simplifies the management process by providing clear, structured organization that reduces the overhead of evaluating and switching between configurations during mobility events.
Data Source
AI summary
A UE receives a first primary cell group (MCG) configuration and a first secondary cell group (SCG) configuration; and receives a set of conditional secondary cell group (SCG) configurations, each conditional SCG configuration including a set of candidate target primary secondary cells (PSCells), corresponding PSCell change execution conditions, and corresponding SCG configurations. The UE communicates with a network, in response to an PSCell change execution condition corresponding to a first PSCell being satisfied, based on the first MCG configuration, the first SCG configuration, and an SCG configuration corresponding to the first PSCell.