Wavelength Multiplexing Communication System for High-Speed Train Networks
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Solution Overview
Problem
High-frequency band usage in mobile communication systems leads to reduced radio coverage per remote unit (RU), increasing the number of required RUs, optical line terminals (OLT-CTs), and optical network units (ONUs), resulting in higher equipment costs and low utilization efficiency due to varying traffic demands in moving bodies like trains.
Innovation Solution
A wavelength multiplexing communication system where a master station communicates with slave stations using a limited number of wavelengths, dynamically assigning wavelengths for main signal communication and control signals, allowing RUs to share wavelengths for efficient band utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of RUs is increased to provide wide frequency bandwidth for high-speed radio communication, then the radio coverage area is improved, but the number of required wavelengths, OLT-CTs, and ONUs increases, leading to higher equipment investment costs
Solution Approach 1:
The patent merges the wavelength resources of multiple RUs by allowing slave stations to share the same wavelength when they are not performing main signal communication. This consolidation reduces the total number of wavelengths required from N (one per RU) to a smaller shared pool, directly addressing the contradiction between coverage area and equipment complexity.
Solution Approach 2:
The patent implements dynamic wavelength assignment where slave stations can switch between dedicated wavelengths (when performing main signal communication) and shared wavelengths (when not performing main signal communication). This dynamic resource allocation optimizes the use of wavelength resources, reducing equipment investment costs while maintaining adequate radio coverage.
2Reliability
If dedicated wavelengths are assigned to each slave station for main signal communication, then communication reliability is improved, but the utilization efficiency of wavelengths decreases when traffic demand varies
Solution Approach 1:
The patent segments wavelength usage into two distinct modes: dedicated wavelength usage during main signal communication (ensuring reliability) and shared wavelength usage during non-main signal periods (improving utilization efficiency). This segmentation allows the system to optimize for both reliability and productivity under different operational conditions.
Solution Approach 2:
The patent makes wavelengths universal by enabling them to serve multiple slave stations at different times. A wavelength can be dedicated to one slave station during its main signal communication period and then shared with other slave stations when not in use, increasing overall wavelength utilization efficiency while maintaining communication reliability when needed.
3Adaptability or versatility
If the number of slave stations is increased to cover moving bodies like trains, then radio communication availability is improved, but the actual traffic amount per wavelength remains small, reducing system efficiency
Solution Approach 1:
The patent ensures continuous useful action of wavelength resources by allowing slave stations to share wavelengths during periods when they are not performing main signal communication. This eliminates idle wavelength capacity and maintains system efficiency even as the number of slave stations increases to improve radio communication availability for moving bodies.
Data Source
AI summary
A wavelength multiplexing communication system includes a master station apparatus and a plurality of slave station apparatuses. The master station apparatus includes a wavelength multiplexing communication unit that performs wavelength multiplexing communication with the plurality of slave station apparatuses by wavelengths the number of which is equal to or less than the number of the plurality of slave station apparatuses using an optical signal of a wavelength in a first wavelength group and an optical signal of a wavelength in a second wavelength group. The slave station apparatuses include an optical communication unit that performs communication of the main signal with the master station apparatus by an optical signal of a wavelength in the first wavelength group, which is different from a wavelength in the first wavelength group used by another slave station when the main signal communication is performed in the host slave station apparatus, and performs communication of a signal other than the main signal with the master station apparatus by an optical signal of a wavelength in the second wavelength group, which is a wavelength same as a wavelength used by another slave station apparatus when the main signal communication is not performed in the host slave station apparatus.