CU-DU Connection Establishment Bypassing Interface Delays
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Solution Overview
Problem
In wireless communications, particularly in LTE systems, the central unit (CU)-distributed unit (DU) architecture for secondary base stations leads to significant data transmission delays due to the need for data to traverse both the MeNB-to-SeNB and CU-to-DU interfaces, hindering high data throughput and service rates.
Innovation Solution
A connection establishment method where the CU function entity directly establishes a connection with the DU function entity, allowing part of the data from the master device to bypass the CU-to-DU interface, thereby reducing transmission delays by enabling direct data transmission from the master device to the DU function entity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data is transmitted through the MeNB-to-SeNB interface in a CU-DU architecture, then connectivity is established, but transmission delay increases due to the additional CU-to-DU interface traversal
Solution Approach 1:
The patent segments the data transmission path by allowing direct data transmission from the MeNB to the DU function entity, separating the control plane (which still goes through Cu) from the user plane data path. This segmentation eliminates the unnecessary CU-to-DU traversal for data transmission while maintaining connectivity through the segmented path.
Solution Approach 2:
The patent introduces an intermediary mechanism where the CU function entity establishes a direct data transmission path between the MeNB and DU function entity. This intermediary arrangement allows data to bypass the Cu-to-DU interface while the Cu still manages control functions, effectively using the Cu as a control intermediary rather than a data forwarding node.
2Device complexity
If data transmission goes through multiple interfaces (MeNB-to-SeNB and CU-to-DU), then system architecture is maintained, but data throughput decreases due to accumulated delays
Solution Approach 1:
The patent segments the transmission path into control plane (through Cu) and user plane (direct MeNB to DU), allowing data throughput to improve by eliminating redundant interface traversals while the system architecture is preserved through the segmented approach. Different planes are handled differently to optimize performance.
Solution Approach 2:
The patent applies local quality by optimizing the data transmission path specifically (MeNB to DU direct connection) while maintaining the overall system architecture. The local optimization of the user plane path improves data throughput without compromising the global system structure, as only the data transmission quality is changed locally.
Data Source
AI summary
The present disclosure relates to connection establishment methods and apparatus. In one example method, a central unit (CU) function entity receives a first connection establishment request of a master device, where the first connection establishment request includes at least first identification information of a terminal, identification information of a first data radio bearer (DRB), identification information of a target cell, and interface information of the master device. The CU function entity sends a second connection establishment request to a distributed unit (DU) function entity to request the DU function entity to establish a connection to the master device, where the second connection establishment request includes at least second identification information of the terminal, the identification information of the first DRB, and the interface information of the master device.