Central Unit ACB Parameter Update via Distributed Unit Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In a scenario where a central unit (CU) and a distributed unit (DU) of a base station are split, the CU cannot update the access class barring (ACB) parameter due to lack of knowledge about the current radio situation, leading to network congestion issues.
Innovation Solution
A method and apparatus for the CU to receive information indicating a change in the ACB-related parameter, update it, and transmit the updated parameter to the DU, enabling the CU to control access attempts and prevent network congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the base station is split into CU and DU, then device complexity is reduced and functionality is distributed, but the CU loses the ability to update ACB parameters due to lack of radio situation knowledge
Solution Approach 1:
The base station is segmented into CU and DU with distinct functions. The DU handles radio-related functions including ACB parameter determination, while the CU handles non-radio functions. This segmentation allows the CU to remain simple while the DU maintains radio situation awareness for ACB updates.
Solution Approach 2:
A new interface is introduced between CU and DU to enable communication. The DU acts as an intermediary that provides radio situation information to the CU, allowing the CU to update ACB parameters without directly accessing radio resources. This intermediary mechanism resolves the information asymmetry created by the split architecture.
2Ease of operation
If the CU cannot access radio situation information, then the system maintains clear separation of functions, but network congestion cannot be effectively controlled
Solution Approach 1:
A feedback mechanism is established where the DU monitors radio situation and congestion conditions, then provides this information to the CU. The CU uses this feedback to determine and update ACB parameters appropriately. This feedback loop ensures reliable congestion control while maintaining functional separation between CU and DU.
3Stability of the object's composition
If ACB parameter updates are centralized in the CU, then parameter management is unified, but the CU cannot respond to real-time radio conditions
Solution Approach 1:
The DU performs preliminary actions by continuously monitoring radio conditions and preparing congestion assessment information. When congestion is detected, the DU has the information ready to immediately communicate with the CU, enabling rapid ACB parameter updates. This preliminary preparation maintains both centralized management and fast response.
Data Source
AI summary
Provided are: a method by which a central unit (CU) of a base station updates access control barring (ACB)-related parameters in a wireless communication system; and an apparatus for supporting the same. The method comprises the steps of: receiving information indicating a change in the ACB-related parameters; updating the ACB-related parameters based on the received information; and transmitting the updated ACB-related parameters to a distributed unit (DU) of the base station.