Conditional PSCell Addition for Radio Link Failure Recovery
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Solution Overview
Problem
Current methods for handling radio link failures in wireless communication systems, particularly in dual connectivity scenarios, often result in significant service interruptions and resource inefficiencies due to the need for re-establishment procedures, which can be costly in terms of time and network resources.
Innovation Solution
Implementing conditional primary secondary cell addition/change (CPAC) and conditional handover (CHO) mechanisms that allow wireless transmit/receive units (WTRUs) to proactively switch to secondary cells based on signal quality thresholds and predefined conditions, reducing the likelihood of radio link failures and minimizing service disruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If re-establishment procedures are used to handle radio link failures, then connectivity can be restored, but service interruptions and network resource consumption increase significantly
Solution Approach 1:
The patent applies preliminary action by configuring the WTRU with conditional PSCell addition/change (CPAC) parameters in advance, including candidate cell lists and triggering conditions. When radio link failure occurs, the WTRU can immediately execute the pre-configured CPAC procedure without waiting for network re-establishment commands, thereby reducing service interruption time while maintaining connectivity restoration capability
Solution Approach 2:
The patent implements beforehand cushioning by preparing multiple candidate PSCells in advance with predefined triggering conditions. This creates a buffer mechanism where alternative cells are ready to take over immediately upon failure detection, cushioning the impact of radio link failure and minimizing service disruption without requiring time-consuming re-establishment procedures
2Reliability
If re-establishment procedures are used to handle radio link failures, then connectivity can be restored, but network resource consumption increases
Solution Approach 1:
The patent applies self-service by enabling the WTRU to autonomously execute CPAC procedures upon detecting radio link failure conditions. The WTRU uses pre-configured parameters to automatically select and switch to candidate PSCells without requiring extensive network intervention, signaling, or coordination, thereby reducing network resource consumption while maintaining connectivity restoration capability
3Loss of time
If conditional PSCell addition/change is implemented, then service interruptions are minimized, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the cell management function into distinct components: candidate cell identification, condition monitoring, triggering decision, and execution. This modular approach allows the WTRU to handle CPAC procedures through structured, manageable steps rather than monolithic complex logic, reducing implementation complexity while achieving minimal service interruption
Data Source
AI summary
The disclosure pertains to methods and apparatus configured to receive, from a first base station, conditional primary secondary cell addition configuration information indicating one or more candidate primary secondary cells of a second base station, a detection of a radio link failure on a primary cell of the first base station and a signal quality threshold associated with the one or more candidate primary secondary cells; perform a primary secondary cell addition of a primary secondary cell based on a signal quality of the primary secondary cell and the signal quality threshold; send, to the second base station, first information comprising an indication of a completion of the primary secondary cell addition; and send, to the first base station using resources of the second base station, second information comprising an indication of the radio link failure on the primary cell of the first base station.