RU Precoding Matrix Mapping for Multi-Cell MIMO Fronthaul Reduction
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Solution Overview
Problem
The increasing complexity and cost of installing base stations due to smaller cell coverage in high-frequency communication systems, particularly in 5G, necessitates a more efficient distribution of digital and radio units to reduce fronthaul bandwidth demands and installation costs.
Innovation Solution
A method and electronic device for a radio unit (RU) that processes signal processing by obtaining and identifying MIMO layers and precoding matrices, allowing for efficient storage and management of these matrices across multiple cells, optimizing the distribution of DU and RU functions to minimize fronthaul bandwidth and installation costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple base stations are installed to improve cell coverage in high-frequency communication systems, then signal transmission performance is improved, but installation cost and system complexity increase
Solution Approach 1:
The patent combines the functions of multiple base stations into a single base station by implementing a MIMO system with multiple antenna ports that can serve multiple cells simultaneously. The network device processes precoding matrices for multiple cells through a unified signal processing architecture, reducing the need for separate base station installations while maintaining coverage performance.
Solution Approach 2:
The base station is designed with multi-functional capability to handle multiple cells and multiple MIMO layers simultaneously. The signal processing apparatus can dynamically allocate antenna ports and precoding matrices across different cells, allowing a single base station to perform the work of multiple traditional base stations.
2Productivity
If more antenna ports are allocated for MIMO layers in multiple cells, then signal processing capability is improved, but fronthaul bandwidth requirements increase
Solution Approach 1:
The patent extracts and processes precoding matrix information at the network device before transmitting to the radio access device. By pre-processing the precoding matrices for multiple cells and identifying corresponding antenna ports, the system reduces the amount of raw signal data that needs to be transmitted over the fronthaul interface, thereby reducing bandwidth requirements while maintaining processing capability.
Solution Approach 2:
The network device performs preliminary processing of precoding matrices and antenna port identification before signal transmission. The apparatus pre-determines the mapping between precoding matrices and antenna ports for multiple cells, allowing the radio access device to directly use these pre-configured parameters without requiring extensive real-time fronthaul bandwidth for parameter transmission.
Data Source
AI summary
A method performed by a radio unit (RU) is provided. The method includes obtaining, by the RU from a digital unit (DU), first cell information with respect to a first cell and second cell information with respect to a second cell, based on the first cell information and the second cell information, identifying, by the RU, at least one first multiple input multiple output (MIMO) layer for the first cell and at least one second MIMO layer for the second cell from among a plurality of MIMO layers associated with memory of the RU, based on the first cell information, identifying, by the RU, first address information for the at least one first MIMO layer from a first precoding matrix for the first cell and a precoding matrix for the plurality of MIMO layers, based on the second cell information, identifying, by the RU, second address information for the at least one second MIMO layer from a second precoding matrix for the second cell and the precoding matrix, and storing, by the RU on the memory, the precoding matrix identified based on the first precoding matrix, the second precoding matrix, the first address information, and the second address information.