Conditional PSCell Recovery via Pre-configured Candidates
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing conditional primary secondary cell (PSCell) addition or change procedures, particularly in detecting failures and recovering from them, which can lead to latency and degraded communication performance due to the need for releasing and re-establishing configurations.
Innovation Solution
A method and apparatus for a user equipment (UE) and network entity to receive configuration information for PSCell addition or change, detect failures, and perform recovery actions based on pre- and post-failure measurement values, allowing for maintaining configurations and selecting alternative PSCells for recovery without immediate transmission of failure information or cell re-establishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE releases and re-establishes configurations upon detecting a CPAC failure, then the system ensures reliability of the PSCell addition or change procedure, but the latency increases and communication performance degrades
Solution Approach 1:
The network configures the UE with multiple candidate PSCells and their corresponding configurations in advance, before any failure occurs. When a CPAC failure is detected, the UE can immediately switch to a pre-configured candidate PSCell without needing to release and re-establish configurations, thereby reducing latency while maintaining reliability
Solution Approach 2:
The patent introduces an intermediary recovery procedure where the UE evaluates pre-configured candidate PSCells using stored measurement values upon failure detection. This intermediary step allows the UE to recover from failure without immediate configuration release, bridging the gap between reliability assurance and latency reduction
2Reliability
If the UE immediately transmits failure information and re-establishes cell connection upon detecting CPAC failure, then the system maintains connection reliability, but the communication performance degrades due to interruption
Solution Approach 1:
The network provides configuration information for multiple candidate PSCells in advance, including all necessary parameters for immediate connection establishment. Upon failure, the UE can directly utilize these pre-configured parameters to switch to an alternative PSCell, maintaining communication performance while ensuring connection reliability
Solution Approach 2:
The UE autonomously evaluates pre-configured candidate PSCells using stored measurement values and independently selects an alternative PSCell for recovery without immediate network intervention. This self-service approach minimizes interruption to communication performance while maintaining connection reliability through autonomous failure recovery
3Reliability
If the UE releases configuration information upon detecting CPAC failure, then the system ensures clean state for re-establishment, but the complexity of the recovery procedure increases
Solution Approach 1:
The network configures multiple candidate PSCells with complete connection parameters in advance, eliminating the need for configuration release and re-establishment. The UE simply selects from pre-configured options upon failure, reducing both complexity and maintaining reliability
Solution Approach 2:
Instead of releasing configuration information upon failure, the UE recovers by selecting from pre-configured candidate PSCells that were never discarded. This approach maintains configuration integrity while simplifying the recovery procedure, as no configuration release or re-establishment is needed
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a primary cell or a primary secondary cell (PSCell), configuration information for a conditional PSCell addition or change (CPAC), the configuration information indicating configurations for one or more candidate PSCells. The UE may detect a failure, associated with the conditional PSCell addition or change, associated with a first target PSCell from the one or more candidate PSCells. The UE may perform an action to recover the CPAC based at least in part on detecting the failure. Numerous other aspects are described.