Distributed Power Repeater Channel Loading Management
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Solution Overview
Problem
Existing distributed power control systems for trains face radio traffic congestion in areas with heavy rail traffic, leading to channel saturation and inefficiencies due to repeater activity, which can prevent trains from linking or commanding remotes.
Innovation Solution
A method and system where a distributed power repeater monitors radio traffic, determines channel loading, and adjusts its activity level to prevent saturation by reducing low-priority message relaying and potentially ceasing all message relay activity when channel loading exceeds a predetermined limit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If repeaters relay all messages at full activity level, then communication coverage is improved, but channel congestion increases leading to saturation
Solution Approach 1:
The repeater dynamically adjusts its activity level based on real-time channel loading conditions. When channel loading is high, the repeater reduces or suspends message relaying to prevent saturation; when channel loading is low, the repeater operates at full capacity to maximize coverage. This dynamic adaptation resolves the contradiction between maintaining coverage and avoiding congestion.
Solution Approach 2:
The system changes the operational parameter of the repeater (activity level) based on channel loading conditions. By monitoring channel loading and adjusting the repeater's transmission activity accordingly, the system optimizes the balance between coverage area and traffic volume, preventing channel saturation while maintaining effective communication coverage.
2Quantity of substance
If repeater operation is disabled entirely, then channel congestion is eliminated, but communication coverage in hilly terrain and tunnels is lost
Solution Approach 1:
Rather than completely disabling the repeater, the system dynamically controls its operation based on channel conditions. The repeater remains operational but adjusts its activity level downward when congestion is detected, providing a flexible intermediate solution that maintains coverage in challenging terrain while preventing channel saturation.
Solution Approach 2:
The repeater monitors channel loading conditions and uses this feedback to adjust its message relaying activity. This closed-loop control allows the system to automatically reduce repeater operation when channel congestion is detected, eliminating the need for complete disabling while preventing saturation in high-traffic areas.
3Reliability
If repeaters are used in congested areas like rail yards, then communication reliability is improved, but channel saturation occurs preventing train linking and remote commanding
Solution Approach 1:
The repeater continuously monitors channel loading in congested areas and adjusts its activity level in response. When channel loading exceeds thresholds, the repeater reduces message relaying to prevent saturation, thereby maintaining communication reliability for critical train operations while avoiding channel congestion that would prevent train linking and remote commanding.
Solution Approach 2:
The system dynamically adapts repeater operation in congested rail yard environments based on real-time channel conditions. By adjusting activity levels rather than maintaining fixed operation, the system ensures communication reliability is preserved when needed while preventing channel saturation that would disrupt train control operations.
Data Source
AI summary
A method is provided for operating a distributed power repeater for a train system. The method includes: (a) monitoring all radio traffic on a wireless communications channel used by the repeater to relay distributed power commands between a plurality of transmitters and receivers disposed on a plurality of trains for distributed power control of the trains; (b) determining the level of channel loading on the communications channel; (c) comparing the channel loading to a predetermined limit; (d) if the channel loading is less than the predetermined limit, relaying messages over the wireless communications channel at a first activity level; and (e) if the channel loading exceeds the predetermined limit, relaying messages over the wireless communications channel at a second activity level less than the first activity level.