Dynamic Railway Frequency Band Allocation for Interference Reduction
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Solution Overview
Problem
Current railway communication technologies, such as GSM-R, are limited in supporting advanced services due to their second-generation nature, and there is a need for efficient management of frequency bands to reduce interference and enhance communication reliability, especially when railway dedicated wireless communication networks are not installed in certain regions.
Innovation Solution
A method for flexible communication network access management that determines the type of terminal based on a unique identifier and hands over access between a common terminal and a railway dedicated terminal, allowing the railway dedicated frequency band to be used for general communications in regions without railway installations, thereby distributing traffic and reducing load on mobile communication networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If railway dedicated frequency band is assigned exclusively for railway communication, then communication reliability for railway services is improved, but frequency band utilization efficiency deteriorates when railway dedicated network is not installed in certain regions
Solution Approach 1:
The patent implements dynamic frequency band allocation where the railway dedicated frequency band is exclusively assigned when railway dedicated network is installed, but automatically released for general mobile communication use when railway network is not present. This dynamic switching resolves the contradiction by adapting frequency band usage to actual railway infrastructure distribution, ensuring communication reliability where needed while maximizing frequency utilization efficiency in non-railway regions.
Solution Approach 2:
The patent applies different frequency band allocation policies to different geographic regions based on the presence or absence of railway dedicated network infrastructure. In regions with railway network, the frequency band is reserved for railway services; in regions without railway network, the same frequency band is allocated to general mobile communication. This localized quality approach resolves the contradiction by tailoring frequency band usage to local infrastructure conditions.
2Adaptability or versatility
If railway dedicated frequency band is used for general communications in regions without railway installation, then frequency band utilization efficiency is improved, but interference with railway communication may occur
Solution Approach 1:
The patent introduces a base station as an intermediary that detects the presence or absence of railway dedicated network infrastructure and controls the allocation of railway dedicated frequency band accordingly. The base station acts as a mediator that prevents general mobile communication from using the railway frequency band in regions where railway network exists, thereby avoiding interference while enabling efficient frequency utilization in regions without railway infrastructure.
Solution Approach 2:
The patent implements a feedback mechanism where the base station continuously monitors the presence of railway dedicated network and adjusts frequency band allocation in real-time. When railway network is detected, the system feedback triggers exclusive allocation of the frequency band to railway services; when railway network is absent, the feedback enables general mobile communication to utilize the frequency band. This feedback control prevents interference while maximizing frequency utilization.
3Measurement precision
If terminal type determination is implemented based on unique identifier, then access management accuracy is improved, but system complexity increases
Solution Approach 1:
The patent implements a self-service mechanism where terminals automatically determine their own type (railway dedicated terminal or common terminal) based on their unique identifiers and autonomously select appropriate networks for access. Railway dedicated terminals with specific identifiers automatically access the railway dedicated network, while common terminals access the general mobile communication network. This self-service approach achieves high access management accuracy without requiring complex centralized determination systems, thereby resolving the contradiction between precision and complexity.
Data Source
AI summary
Provided is a network access management method of a terminal, the method including determining whether a terminal located adjacent to a railway dedicated wireless communication network is a common terminal or a railway dedicated terminal, based on a unique identifier (ID) of the terminal, and handing over the terminal to a different communication network allowing an access based on a result of the determining.