Network Node Layer State Control for 5G CU-DU Coordination
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Solution Overview
Problem
In the 5G radio network architecture, the separation of functions between the Central Unit (CU) and Distributed Unit (DU) creates challenges in controlling the layer states, as the physical layer to the RRC layer are closed and controlled in one node, making it difficult to perform appropriate control according to the state of each layer below the RLC layer in the DU, and vice versa.
Innovation Solution
A network node system where a control unit acquires and transmits information regarding layer states between nodes, allowing for appropriate control of layer states between the CU and DU, with the DU managing layers below the RLC and the CU managing layers above the PDCP, using network interfaces to indicate and manage layer states such as synchronization, data activity, and RLC states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the layer structure is separated between CU and DU nodes, then the system capacity and data transmission speed are improved, but the control complexity between nodes increases and appropriate control according to layer state becomes difficult
Solution Approach 1:
The patent implements feedback mechanisms where network nodes exchange information about their layer states (such as RRC state, PDCP state, RLC state) with connected nodes. This feedback enables each node to make informed control decisions based on the actual state of the distributed layer structure, resolving the control complexity issue while maintaining the benefits of functional separation.
Solution Approach 2:
The patent introduces intermediary communication protocols and message structures that facilitate coordination between CU and DU nodes. These intermediaries standardize the information exchange about layer states, making the distributed control more manageable and less complex while preserving system capacity improvements.
2Speed
If the layer structure is separated between CU and DU nodes, then the data transmission speed is improved, but the coordination and control between nodes becomes more difficult
Solution Approach 1:
The patent segments the layer structure into distinct functional units (CU and DU) with clearly defined responsibilities. Each segment manages specific layers independently, which simplifies coordination by reducing the scope of interaction needed between nodes while maintaining high data transmission speeds through optimized local control.
Solution Approach 2:
The patent establishes feedback channels that allow segmented nodes to report their layer states and receive coordination instructions. This feedback mechanism makes coordination easier by providing real-time visibility into the state of each segment, enabling efficient decision-making without compromising data transmission speed.
3Reliability
If information regarding layer states is exchanged between nodes, then appropriate control according to layer state is achieved, but the information transmission overhead increases
Solution Approach 1:
The patent extracts only the essential layer state information needed for control decisions (such as RRC state, PDCP state, RLC state) and excludes redundant data. This extraction approach maintains control accuracy by focusing on critical parameters while reducing information overhead through selective data transmission between nodes.
Solution Approach 2:
The patent changes the parameter representation of layer state information to more compact and efficient formats. By optimizing how layer state parameters are encoded and transmitted, the patent achieves accurate control while minimizing the quantity of information that needs to be exchanged between CU and DU nodes.
Data Source
AI summary
A network node that is a second network node connected to a user device and a first network node includes: a control unit that acquires information regarding a layer which is terminated at the user device and the second network node; and a transmission unit that transmits the information regarding the layer to the first network node. The layer is not terminated at the user device and the first network node.