DU Cell Migration via Modular PDP and BPP Function Pods
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Solution Overview
Problem
Existing mobile communication networks face challenges in efficiently managing distributed unit (DU) resources due to varying UE demands, leading to inefficiencies and increased deployment costs in both D-RAN and C-RAN structures.
Innovation Solution
A method and electronic device for cell migration in a wireless network system, allowing relocation of packet distributing pod (PDP) and baseband processing pod (BPP) functions between a centralized-radio access network (C-RAN) hub and distributed units (DUs), utilizing virtualization and dynamic resource allocation to optimize DU capacity and reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DU functions are distributed across multiple base stations in D-RAN structure, then network coverage and service availability are improved, but resource utilization efficiency deteriorates due to varying UE demands at different locations
Solution Approach 1:
The DU is segmented into multiple functional pods (PDP for RLC layer, BPP for MAC layer) that can be independently relocated. This segmentation allows partial functions to be moved to the C-RAN hub while leaving other functions at the original base station, thereby maintaining service availability while optimizing resource utilization through dynamic allocation.
Solution Approach 2:
The patent implements dynamic cell migration where DU functions can be relocated between base stations and C-RAN hub based on real-time UE demand conditions. The system continuously monitors traffic load and automatically triggers function relocation when thresholds are exceeded, transforming the static distributed architecture into a dynamic system that adapts to changing conditions.
2Productivity
If DU functions are centralized at C-RAN hub, then resource utilization efficiency is improved through pooling, but deployment complexity and transmission requirements worsen
Solution Approach 1:
Instead of fully centralizing all DU functions at the C-RAN hub, the patent segments functions into modular pods that can be selectively relocated. This partial centralization approach achieves resource pooling benefits for high-demand cells while avoiding the complexity of complete centralization, allowing a gradual and flexible deployment strategy.
Solution Approach 2:
The C-RAN hub is designed with universal capability to host multiple DU function pods from different base stations. This multi-functionality allows the hub to dynamically allocate resources across multiple cells and base stations, improving overall resource utilization while managing deployment complexity through standardized interfaces.
3Productivity
If cell migration is implemented to optimize resource allocation, then productivity is improved, but system complexity and control overhead worsen
Solution Approach 1:
The system performs preliminary preparation for cell migration by pre-configuring backup DU function pods at potential target locations before actual migration is needed. When UE demand exceeds thresholds, the pre-prepared functions can be quickly activated and switched to, reducing the complexity of real-time migration control while maintaining high productivity.
Solution Approach 2:
The patent implements a feedback mechanism where UE demand conditions are continuously monitored and fed back to the control system. When demand thresholds are exceeded, this triggers automated function relocation decisions. The feedback loop enables simple threshold-based control logic that achieves efficient resource allocation without requiring complex optimization algorithms.
Data Source
AI summary
A method performed by a centralized-radio access network (C-RAN) hub device in a wireless communication system is provided. The method includes transmitting a request message for moving a function for a cell of a distributed unit (DU) connected to the C-RAN hub device, based on the request message reallocating at least one of a packet distributing pod (PDP) function of the DU for a radio link control (RLC) layer or a baseband processing pod (BPP) function for a medium access control (MAC) layer, and based on the reallocation, performing at least one of the PDP function of the DU and the BPP function of the DU.