UE Configuration Management for Conditional Procedure Failures
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing configurations when a conditional procedure fails, particularly in conditional handover (CHO), conditional SN addition/change (CSAC), and conditional PSCell change (CPC) scenarios, leading to communication failures due to mismatched configurations between the UE and RAN.
Innovation Solution
Implementing a mechanism where the UE and RAN manage configurations by reverting to previous or consistent configurations after a conditional procedure failure, ensuring seamless communication by using subsequent or prior configurations that are compatible, thereby avoiding communication failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE applies a conditional configuration when the condition is met, then the UE can successfully execute the conditional procedure (CHO/CSAC/CPC), but if the UE and RAN have mismatched configurations, communication failures occur
Solution Approach 1:
The RAN provides both a conditional configuration (for when the condition is met) and a subsequent configuration (for when the condition is not met or procedure fails) in advance. The UE stores these pre-prepared configurations and applies the appropriate one based on whether the conditional procedure succeeds, eliminating the need for complex post-failure configuration negotiations
Solution Approach 2:
The RAN creates a copy of the conditional configuration and modifies it to create a subsequent configuration that is compatible with the original conditional configuration. This copied and adapted configuration ensures that even if the conditional procedure fails, the UE and RAN can continue using consistent, pre-matched configuration parameters
2Productivity
If the UE reverts to a previous configuration after conditional procedure failure, then communication continuity is maintained, but configuration consistency between UE and RAN may be compromised
Solution Approach 1:
The subsequent configuration acts as an intermediary solution between the conditional configuration and the original first configuration. It is specifically designed to be compatible with the conditional configuration's parameters, serving as a bridge that maintains communication continuity while ensuring configuration consistency between UE and RAN after failure
3Reliability
If the RAN provides subsequent configuration to the UE, then the UE can maintain communication after conditional procedure failure, but the configuration management overhead increases
Solution Approach 1:
The subsequent configuration is not a complete reconfiguration but rather a localized adjustment that modifies only the necessary parameters to ensure compatibility with the conditional configuration. This targeted approach provides the needed communication recovery capability while minimizing the amount of configuration data that needs to be managed and transmitted
Data Source
AI summary
A user equipment (UE) in communication with a radio access network (RAN) in accordance with a first configuration (i) receives (1102) from the RAN, a conditional configuration for application in a conditional procedure when a corresponding condition is satisfied; (ii) subsequently to receiving the conditional configuration, applies (1104) a second configuration received from the RAN; (iii) detects (1106), after applying the second configuration, a failure to execute the conditional procedure; and (iv) in response to the detecting, continues (1108) to apply the second configuration or notifies the RAN of the UE reverting back to the first configuration.