CU-DU Configuration Mismatch Resolution via Feedback
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Solution Overview
Problem
In the New Radio Access Technology system, an understanding mismatch occurs between the Central Unit (CU) and Distributed Unit (DU) when the CU cannot comprehend the configured configuration received from another node, while the DU can understand it, leading to failed procedures such as SN change and handover, as there is no specified method to resolve this mismatch.
Innovation Solution
A communication device is provided that notifies another device of the need for full configuration when it cannot understand the received configuration, with methods including explicit or implicit messages indicating the requirement for full configuration, ensuring both CU and DU generate full configurations to resolve the mismatch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If CU and DU use different functional separations with different layer functions, then device complexity is reduced and flexibility is improved, but understanding mismatch occurs between CU and DU when receiving configured configuration
Solution Approach 1:
The DU feeds back to the CU whether it can understand the configured configuration received from another gNB. This feedback mechanism allows the CU to make informed decisions about whether to generate full configuration or rely on the DU's existing configuration understanding, thereby resolving the understanding mismatch while maintaining functional separation benefits
Solution Approach 2:
The CU acts as an intermediary between the external configuration source and the DU. It receives the configured configuration, assesses its own understanding, queries the DU's understanding capability, and decides whether to generate full configuration or use delta configuration, thus mediating the configuration distribution process
2Reliability
If full configuration is executed to resolve understanding mismatch, then configuration consistency is improved, but signaling overhead and processing time increase
Solution Approach 1:
Instead of always executing full configuration, the system performs partial configuration (delta configuration) when the DU can understand the received configured configuration. Full configuration is only executed when necessary (when CU cannot understand), thus reducing unnecessary signaling overhead and processing time while maintaining configuration consistency
3Reliability
If CU generates full configuration when it cannot understand received configuration, then configuration reliability is improved, but device complexity and processing load increase
Solution Approach 1:
The DU performs self-assessment of its configuration understanding capability and provides feedback to the CU. This self-service approach reduces the CU's processing burden and complexity, as the DU independently evaluates its own ability to handle the configured configuration without requiring extensive CU intervention
Data Source
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AI summary
A communication unit is provided that notifies another communication device that full configuration is required to be generated when a received configured configuration cannot be understood or when a message requesting execution of full configuration is received.