User-Centric Cell Resource Management in C-RAN
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Solution Overview
Problem
In conventional cellular networks, terminals located at cell edges experience performance degradation due to interferences from adjacent base stations, which cannot be alleviated by existing cooperative technologies like CoMP, and the application of CFmMIMO is limited by fronthaul network constraints such as jitter, bandwidth limitations, and delivery delay.
Innovation Solution
A resource management method in a user-centric wireless network that divides total time-frequency resources into orthogonal resources, allocating them to user-centric cells to minimize interference, using a central processor to determine orthogonal resource sharing groups and map resources, with the help of bipartite matching techniques and weight calculations based on interference and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If all base stations cooperate with each other without cell boundaries (CFmMIMO), then interference to terminals at cell edges is reduced, but the amount of information to be exchanged between base stations becomes vast and real-time exchange is difficult due to fronthaul network limitations
Solution Approach 1:
The patent segments the network into multiple user-centric cells, each served by a dedicated access node. This segmentation allows interference management within each cell while avoiding the need for all base stations to cooperate simultaneously, thus reducing information exchange complexity while maintaining interference reduction benefits.
Solution Approach 2:
The patent implements user-centric cells with dedicated access nodes that provide localized service to specific terminals. Each cell operates independently with its own resource allocation, allowing interference management at the local level without requiring network-wide coordination, thereby reducing the burden on fronthaul networks.
2Object-affected harmful factors
If base stations form clusters to cooperate (CoMP), then performance degradation at cell edges is alleviated, but terminals at cluster edges still experience interference from other clusters
Solution Approach 1:
Instead of having base stations form clusters to provide coverage, the patent inverts the approach by having each base station serve a dedicated user-centric cell. This inversion eliminates the boundary problem between clusters because each cell is independently managed with its own access node, preventing interference from other cells while maintaining flexible resource allocation.
3Object-affected harmful factors
If user-centric cells are configured with dedicated access nodes, then interference between cells is minimized, but resource allocation must consider interference and throughput to ensure fair performance
Solution Approach 1:
The patent implements a feedback mechanism where the central processor receives interference information from access nodes and uses this feedback to adjust resource allocation. The central processor calculates weights based on interference and throughput measurements, then allocates orthogonal resources accordingly, ensuring fair performance while managing interference through iterative feedback loops.
Data Source
AI summary
A resource management method performed by a CP in C-RAN system includes configuring M user-centric cells for M terminals with a plurality of ANs, and determining a number K of orthogonal resource sharing groups sharing a same orthogonal resource; selecting K user-centric cells as group headers for the K orthogonal resource sharing groups, and adding the selected K user-centric cells as group headers to the K orthogonal resource sharing groups; configuring the K orthogonal resource sharing groups by sequentially adding ungrouped user-centric cells to the K orthogonal resource sharing groups; and dividing total system resources into K orthogonal resources, and mapping the divided K orthogonal resources to the K orthogonal resource sharing groups, respectively.