Analog Radio-over-Fiber Transmission for Cloud Base Stations
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Solution Overview
Problem
Current digital optical transmission technologies for fifth-generation mobile communication networks incur high network establishment costs and complexity, making it difficult to establish a commercial network, thus a cost-efficient analog radio-over-fiber (RoF) transmission scheme is needed for cloud base stations.
Innovation Solution
A radio-over-fiber (RoF) transmission system comprising a baseband unit (BBU), optical line terminal (OLT), optical distribution network (ODN), optical network unit (ONU), and remote radio head (RRH) that converts radio signals into optical signals and back, using optical fibers and splitters to support high-capacity mobile Internet services with MIMO configuration and efficient signal distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If digital optical transmission technology is utilized for fifth-generation mobile communication networks, then network capacity and service quality are improved, but network establishment cost and complexity increase significantly
Solution Approach 1:
The patent replaces complex digital signal processing systems with an analog radio-over-fiber transmission system. The BBU converts radio signals to optical signals that are transmitted through optical fibers to ONUs, which convert them back to radio signals for RRHs. This analog approach eliminates the need for complex digital optical transmission equipment while maintaining network capacity for fifth-generation mobile communication services.
Solution Approach 2:
The patent changes the transmission parameter from digital signals to analog radio signals over optical fiber. By transmitting radio frequency signals directly in analog form through the optical network, the system achieves fifth-generation network capacity without requiring the complex digital signal processing and conversion infrastructure that would otherwise be necessary.
2Reliability
If digital optical transmission technology is utilized for fifth-generation mobile communication networks, then service quality is improved, but network establishment cost increases
Solution Approach 1:
The patent makes the existing optical network infrastructure universal by using it for both traditional data transmission and radio signal transmission. The optical fiber network, already deployed for internet services, is repurposed to carry radio-over-fiber signals for fifth-generation mobile communication, eliminating the need for separate dedicated transmission infrastructure and significantly reducing network establishment costs while maintaining service quality.
Solution Approach 2:
The system allows the existing optical network to serve dual purposes - its original data transmission function and the new radio signal transmission function for mobile communication. This self-service approach enables the infrastructure to support fifth-generation services without requiring additional dedicated resources, thereby reducing overall establishment costs while maintaining reliable service quality.
3Ease of manufacture
If analog radio-over-fiber transmission scheme is used, then network establishment cost is reduced, but signal distribution efficiency must be maintained
Solution Approach 1:
The patent segments the optical network into multiple ONUs that can independently receive and process optical signals. Each ONU serves specific RRHs, allowing parallel signal distribution to multiple locations simultaneously. This segmentation enables the cost-effective analog radio-over-fiber system to maintain high signal distribution efficiency by handling multiple channels concurrently through the optical fiber network.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides a cost-effective and simple structure for establishing and managing cloud base stations, enabling high-speed mobile Internet services by efficiently utilizing existing optical infrastructure and reducing signal latency, thereby supporting economical network establishment.
Implementation Method 1
an optical line terminal (OLT) configured to convert a radio signal received from the at least one BBU into an optical signal
Implementation Method 2
at least one optical network unit (ONU) configured to receive the optical signal from the OLT via the ODN and convert the optical signal into a radio signal
Data Source
AI summary
A radio-over-fiber (RoF) transmission system includes at least one baseband unit (BBU) connected to a core network of a service provider that provides a mobile Internet service, an optical line terminal (OLT) configured to convert a radio signal received from the at least one BBU into an optical signal, an optical distribution network (ODN) comprising an optical fiber and an optical splitter, at least one optical network unit (ONU) configured to receive the optical signal from the OLT via the ODN and convert the optical signal into a radio signal, and at least one remote radio head (RRH) configured to receive the radio signal from the at least one ONU and output the radio signal via a plurality of antennas.