CU-DU Tunnel Duplication for Reliable Radio Bearer Paths
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Solution Overview
Problem
The implementation of a duplication mode for a radio bearer in a CU-DU architecture is a pressing issue in radio communications systems, particularly in the context of 5th generation communications technologies where one PDCP entity corresponds to at least two RLC entities, necessitating effective duplication strategies.
Innovation Solution
A method is provided to establish a CU-DU connection in a duplication mode by configuring and managing uplink and downlink tunnel endpoints and paths between the CU and DU, including the establishment of primary and secondary paths, and implementing duplication modes for both data and signaling radio bearers through explicit messaging and configuration between the CU and DU.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If duplication mode is implemented for radio bearers in CU-DU architecture, then communication reliability is improved, but system complexity increases
Solution Approach 1:
The patent segments the radio bearer duplication function into distinct components: PDCP entities at the CU, multiple RLC entities at the DU, and separate tunnel endpoints. This segmentation allows each component to be independently configured and managed, reducing overall system complexity while maintaining reliability through duplication.
Solution Approach 2:
The F1 interface acts as an intermediary between the CU and DU, carrying duplication configuration messages and user plane data. This intermediary mechanism enables coordinated duplication operations without requiring direct complex interactions between PDCP and RLC entities, simplifying the overall system architecture.
2Adaptability or versatility
If multiple tunnel endpoints are configured for duplication mode, then path diversity is improved, but configuration complexity increases
Solution Approach 1:
The patent establishes multiple tunnel endpoints and associates them with different paths before actual data transmission begins. The CU configures uplink tunnel endpoints and the DU configures downlink tunnel endpoints in advance, creating a ready-to-use duplicated path structure that simplifies real-time operation.
Solution Approach 2:
The CU and DU exchange configuration messages through the F1 interface to confirm tunnel endpoint associations and path configurations. This feedback mechanism ensures both sides have consistent understanding of the duplication setup, reducing configuration errors and simplifying management.
Data Source
Figure 1
Figure 2A~2B
Figure 2C~3A
AI summary
Embodiments of this application provide a duplication (duplication) mode communication processing method in a central unit-distributed unit (CU-DU) architecture. In a possible implementation, in a process of establishing a user plane tunnel between a CU and a DU by exchanging information about uplink tunnel endpoints and information about downlink tunnel endpoints, the DU provides an identity of a primary path to the CU, thereby implementing a duplication mode of a data radio bearer.