CU-DU Communication Feedback for SCG Configuration Parsing
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Solution Overview
Problem
In a 5G mobile communications system with a CU-DU architecture, the distributed unit (DU) fails to correctly obtain configuration information of a secondary cell group (SCG) due to parsing issues, leading to system errors.
Innovation Solution
The DU sends cell group configuration information and/or a first instruction to the central unit (CU) to trigger full configuration, and the CU generates radio bearer configuration information accordingly, ensuring complete and accurate configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the CU sends reference configuration information of SCG to the DU, then the configuration transfer process is simplified, but the DU cannot correctly parse the configuration information causing system errors
Solution Approach 1:
The DU sends a first instruction to the CU to indicate that it cannot correctly parse the reference configuration information. The Cu receives this feedback and generates full configuration information accordingly, ensuring the DU obtains correct and complete configuration data.
2Productivity
If the DU uses reference configuration information, then the configuration acquisition is more efficient, but the parsing correctness deteriorates leading to system errors
Solution Approach 1:
The DU provides feedback through the first instruction when parsing errors are detected. The Cu responds by generating full configuration information, thereby correcting the parsing errors while maintaining efficient configuration acquisition processes.
Solution Approach 2:
The system changes the configuration information from reference-based to full configuration based on the parsing correctness requirement. This parameter change ensures that the DU receives complete and accurate configuration data when needed.
3Reliability
If the CU generates full configuration information, then the configuration completeness is improved, but the processing complexity increases
Solution Approach 1:
The Cu only generates full configuration information when the DU sends the first instruction indicating parsing failures. This conditional generation approach maintains configuration completeness when needed while avoiding unnecessary processing complexity during normal operations.
Data Source
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AI summary
Embodiments of this application provide a communication method, to resolve a problem that a system error is caused because when a base station having a CU-DU architecture is used as a secondary base station, a DU cannot correctly obtain, through parsing, configuration information of an SCG sent by a CU to the DU. The method includes: sending, by a distributed unit DU, a first instruction and/or cell group configuration information with a full configuration to a central unit CU, where the first instruction is used to notify the central unit CU of a status in which the distributed unit DU has performed full configuration; and sending, by the distributed unit, a second instruction from the CU to a terminal device, where the second instruction is used to instruct the terminal device to perform a configuration update operation.