Split-Deployment Baseband Coordination with gNB-DU Feature Selection
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Solution Overview
Problem
In 5G cellular communications networks, the central unit (gNB-CU) is solely responsible for selecting band combinations and feature sets, limiting the ability of the distributed unit (gNB-DU) to indicate the best band combination or feature set based on its substantial knowledge of layer 1 capability and current radio conditions.
Innovation Solution
The distributed unit (gNB-DU) is allowed to select the feature set and, where appropriate, the band combination for the Secondary Cell Group (SCG) configuration, informing the central unit of its selection to enhance baseband processing capability coordination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the central unit (gNB-CU) is solely responsible for selecting band combinations and feature sets, then the control architecture is simplified and centralized, but the distributed unit (gNB-DU) cannot indicate the best band combination or feature set based on its knowledge of layer 1 capability and current radio conditions
Solution Approach 1:
The patent segments the decision-making process for band combination and feature set selection between the central unit and distributed unit. The gNB-CU provides a list of candidate band combinations and feature sets, while the gNB-DU selects the appropriate combination based on local radio conditions and layer 1 capabilities. This segmentation allows both centralized control and local optimization to coexist.
Solution Approach 2:
The patent enables the distributed unit to make locally-informed decisions about band combination and feature set selection based on its knowledge of current radio conditions and layer 1 capabilities. Each gNB-DU can independently select the optimal configuration from candidates provided by the gNB-CU, allowing local quality and adaptability to be maintained while preserving overall system coordination.
2Productivity
If the distributed unit (gNB-DU) is allowed to select the feature set and band combination, then the baseband processing capability coordination is optimized based on local knowledge, but the control architecture becomes more complex and distributed
Solution Approach 1:
The gNB-CU performs preliminary action by generating and providing a list of candidate band combinations and feature sets to the gNB-DU before the actual selection process. This preliminary preparation reduces the complexity at the distributed unit, as it only needs to select from pre-evaluated candidates rather than performing comprehensive analysis itself.
Solution Approach 2:
The patent introduces an intermediary mechanism where the gNB-CU acts as a mediator that provides candidate configurations to the gNB-DU. The gNB-DU then selects the appropriate candidate based on local conditions and communicates the selection back to the gNB-CU. This intermediary approach distributes intelligence while maintaining coordination, optimizing network performance without excessive complexity.
3Extent of automation
If only the central unit can select the band combination and feature set, then the decision-making process is centralized, but the distributed unit's substantial knowledge of layer 1 capability is underutilized
Solution Approach 1:
The patent introduces dynamic decision-making where the gNB-DU can adaptively select band combinations and feature sets based on changing local radio conditions and layer 1 capabilities. This dynamic approach allows the system to respond to real-time variations in the wireless environment, improving adaptability while maintaining centralized coordination through the candidate list mechanism.
Solution Approach 2:
The patent implements a feedback mechanism where the gNB-DU communicates its selected band combination and feature set back to the gNB-CU. This feedback loop allows the centralized unit to maintain awareness of local decisions and adjust future candidate lists accordingly, balancing centralized control with local adaptability.
Data Source
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AI summary
In a process for adding a base station as a secondary base station, and for example in 5 response to a UE Context Setup Request or a UE Context Modification Request, a distributed unit of a base station selects a feature set, and informs a central unit of the base station of the selected feature set.