L1-Split MIMO Hybrid Beamforming Bandwidth Optimization
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Solution Overview
Problem
Current cellular networks face limitations in bandwidth and interference management, particularly in high-user-density areas, where existing technologies struggle to efficiently distribute and process data signals across multiple cell sites, leading to reduced network capacity and coverage.
Innovation Solution
Implementing a multiple input, multiple output (MIMO) communications system with hybrid beamforming in a layer 1 split architecture, which includes frequency domain compression and statistical multiplexing, and hybrid analog/digital beamforming to optimize signal processing and transmission across base stations, enabling efficient data transmission and improved coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional cellular networks are used to serve multiple users in high-density areas, then network coverage is maintained, but network capacity and bandwidth are insufficient
Solution Approach 1:
The base station is segmented into two separate functional units: a remote unit (RU) that handles RF signal processing and analog beamforming, and a digital unit (DU) that handles digital signal processing and coordination. This segmentation allows distributed MIMO operations across multiple sites while managing bandwidth requirements through selective signal processing at each location.
Solution Approach 2:
The patent transitions from traditional single-site MIMO to multi-site distributed MIMO by adding the spatial dimension of multiple geographically separated base station sites. This enables the system to serve more users simultaneously across a larger area, effectively increasing network capacity without proportionally increasing bandwidth requirements at any single site.
2Productivity
If more base stations are deployed to increase network capacity, then coverage and user connectivity improve, but system complexity and interference management become more difficult
Solution Approach 1:
Multiple geographically distributed base station sites are merged into a unified virtual MIMO system through the L1-split architecture. The digital unit coordinates signals from multiple remote units, allowing them to function as a single logical base station with enhanced capacity. This merging approach increases user connectivity while managing system complexity through centralized digital processing.
Solution Approach 2:
The digital unit acts as an intermediary between multiple remote units and the core network. It coordinates the distributed RF units, manages signal processing, and handles interference mitigation, thereby reducing the overall system complexity that would otherwise result from having multiple independent base stations.
3Quantity of substance
If frequency domain compression is applied to reduce bandwidth requirements, then transmission efficiency improves, but signal processing complexity increases
Solution Approach 1:
The system applies frequency domain compression by transforming time-domain signals to the frequency domain and selectively processing different frequency components. This parameter transformation reduces the overall bandwidth requirements while the associated signal processing complexity is managed through the distributed architecture, where the digital unit handles the complex frequency domain operations.
Data Source
AI summary
A system, a method, and a computer program product for transmission of data using a multiple input, multiple output communications system with hybrid beamforming in a layer 1 split architecture. A first portion of a signal is processed at a first portion of a physical layer located in a first portion of a base station. A frequency domain compression with statistical multiplexing is applied to the processed first portion of the signal. A compressed first portion of the signal is generated. The compressed first portion of the signal and a second portion of the signal are transmitted to a second portion of the physical layer located in a second portion of the base station.