Selective Cell Group Activation for Conditional PSCell Change
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Solution Overview
Problem
Existing wireless communication networks face challenges in efficiently managing mobility of wireless terminals, particularly in highly mobile environments, to provide high-speed, low-latency, and ultra-reliable communication, especially during successive or subsequent cell changes.
Innovation Solution
A method for selective activation of cell groups involves a master node sending a request to a candidate secondary node for preparing cell group activation procedures, including lists of candidate cells and conditions for subsequent cell changes, allowing the network to pre-configure and manage candidate cells efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional cell change management is used, then network simplicity is maintained, but mobility management reliability and speed deteriorate in highly mobile environments
Solution Approach 1:
The patent applies preliminary action by pre-configuring candidate PSCell configurations and preparation conditions before actual cell change occurs. The master node sends reconfiguration messages to candidate secondary nodes in advance, preparing multiple candidate cells with their configurations and conditions. This allows the network to have ready-to-execute cell change plans, improving reliability and reducing interruption time when mobility events occur, while maintaining manageable complexity through structured preparation.
2Reliability
If multiple candidate cells are prepared for subsequent cell changes, then cell change reliability improves, but signaling overhead and processing complexity increase
Solution Approach 1:
The patent applies segmentation by dividing the cell change management into distinct segments: candidate PSCell configuration, execution condition evaluation, and actual cell change execution. The master node segments the candidate cells into different groups with specific conditions, allowing selective activation based on current network state. This segmentation enables reliable multi-candidate preparation while reducing signaling overhead by only transmitting necessary configuration segments rather than all possible combinations.
Solution Approach 2:
The patent applies dynamics by making the cell change management adaptive and flexible. The master node dynamically selects which candidate cells to activate based on current network conditions and UE state. The system can adjust the number and type of candidate cells prepared, modify execution conditions, and selectively activate appropriate candidates. This dynamic approach maintains high reliability through multiple prepared options while minimizing signaling overhead by only managing actively relevant candidates rather than all possible cells.
3Speed
If conditional PSCell addition/change is implemented, then mobility speed improves, but interruption time during cell transition increases
Solution Approach 1:
The patent applies preliminary action by pre-preparing candidate PSCell configurations and their associated conditions before actual cell transition occurs. The master node sends reconfiguration messages to candidate secondary nodes in advance, so that when a mobility event triggers cell change, the target PSCell configuration is already ready. This eliminates the need for time-consuming on-demand configuration, enabling faster cell transitions while maintaining mobility speed benefits of conditional addition/change mechanisms.
Data Source
AI summary
This disclosure is directed generally to wireless communications and more specifically to an improved handling of mobility of wireless terminals via successive/subsequent conditional cell change. The various example implementations are provided to describe example manners for preparing candidate SCG/PSCell configurations for SCG selective activation to support subsequent conditional PSCell addition/change among various network elements, including indicating the available/subsequent candidate PSCells among all candidate PSCells to be evaluated when a candidate PSCell become a serving PSCell during the UE mobility.