Conditional PSCell Change Signaling in Multi-RAT Dual Connectivity
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing conditional primary secondary cell (PSCell) changes in multi-radio access technology (multi-RAT) dual connectivity environments, particularly in ensuring reliable signaling aspects during these changes.
Innovation Solution
The method involves a master node (MN) receiving messages indicating that a user equipment (UE) has determined a condition for a conditional PSCell change is satisfied, and subsequently transmitting confirmation messages to source secondary nodes. This process includes revising master cell group configurations and releasing reserved resources as necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conditional PSCell change procedures are implemented in multi-RAT dual connectivity, then wireless communication performance is improved, but signaling reliability during cell changes deteriorates
Solution Approach 1:
The patent applies preliminary action by having the master node pre-configure multiple candidate target PSCells and their associated signaling parameters before the actual cell change is needed. This allows the system to prepare alternative paths in advance, so when a cell change is triggered, the UE can quickly switch to a pre-configured candidate without losing signaling connectivity. The master node maintains configuration information for multiple candidate cells, including their respective secondary node identifiers and bearer configurations, enabling rapid failover while preserving signaling reliability.
2Adaptability or versatility
If multiple candidate target PSCells are configured for conditional PSCell change, then adaptability of the system is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the complex configuration into distinct modular components: each candidate target PSCell is configured with its own unique identifier, associated secondary node identifier, and specific bearer configuration. The master node maintains a segmented list of these candidates rather than a monolithic configuration. This modular structure allows the system to adapt to different scenarios by selecting appropriate candidates while keeping the overall management complexity manageable through structured organization.
Solution Approach 2:
The patent implements universality by designing a standardized configuration framework that can accommodate multiple types of candidate PSCells with different parameters. The same configuration structure and message formats are used regardless of which specific candidate is selected, allowing the system to handle diverse cell types (intra-RAT, inter-RAT, different frequency ranges) through a universal interface. This multi-functional approach enables the system to adapt to various scenarios without requiring separate complex configuration mechanisms for each case.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a master node (MN) may receive a message indicating that a user equipment (UE) has determined that a condition for a conditional primary secondary cell (PSCell) change has been satisfied for a candidate target PSCell. The candidate target PSCell may be one of a set of candidate target PSCells associated with the UE in a conditional PSCell change configuration provided by a base station. The MN may transmit, to a source secondary node, a confirmation message associated with the conditional PSCell change. Numerous other aspects are provided.