Radio Communication System with Redundant Data Frame Transmission
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Solution Overview
Problem
Industrial automation systems face communication interruptions and message loss due to high message traffic and short message lengths, leading to potential production failures and costly outages, with existing redundancy protocols like Media Redundancy Protocol and High-availability Seamless Redundancy experiencing issues with message loss and latency in wireless communication systems.
Innovation Solution
A radio communication system with a radio base station and subscriber stations that use multiplexer units for redundant data frame transmission over multiple carrier frequencies, incorporating redundancy handling units for restoring data frames from fragments, and adaptive carrier frequency selection based on signal quality and interference, enabling efficient resource use and interference resilience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If bumpy media redundancy methods are used, then device complexity is reduced, but message loss occurs and fault states are present during reconfiguration
Solution Approach 1:
The system pre-configures redundant communication paths and establishes backup connections before faults occur. The redundancy manager proactively monitors connection quality and prepares alternative routes, ensuring that when a fault occurs, the system can immediately switch to pre-established backup paths without message loss or fault states during reconfiguration.
Solution Approach 2:
The system implements buffer mechanisms and error correction codes in advance to cushion against potential message loss. Redundant message copies are prepared and stored beforehand, and error detection/correction capabilities are built into the communication protocol, allowing the system to recover from transmission errors without affecting overall reliability.
2Reliability
If High-availability Seamless Redundancy is used, then message transmission reliability is improved, but latency increases in wireless communication systems
Solution Approach 1:
The system dynamically adapts redundancy mechanisms based on real-time channel conditions. When wireless channel quality is good, the system reduces redundancy overhead and uses lighter error correction, minimizing latency. When channel quality deteriorates, the system increases redundancy and error correction strength, maintaining reliability while optimizing the balance between reliability and latency based on current conditions.
Solution Approach 2:
The system changes communication parameters such as modulation schemes, coding rates, and redundancy levels adaptively based on channel quality metrics. By adjusting these parameters dynamically, the system achieves high reliability when needed while minimizing latency during good channel conditions, resolving the contradiction between reliability and time loss in wireless environments.
3Reliability
If parallel redundant transmission is used, then message transmission reliability is improved, but resource efficiency decreases
Solution Approach 1:
Instead of always transmitting full redundant copies in parallel, the system uses partial redundancy where only critical portions of messages are duplicated, or uses forward error correction that adds minimal overhead. This provides sufficient reliability for industrial applications while consuming fewer radio resources, achieving a balance between reliability and resource efficiency.
Solution Approach 2:
The system implements selective redundancy where redundant message copies are discarded when not needed (when channel conditions are good) and recovered/activated when channel quality deteriorates. This allows the system to maintain high reliability when necessary while optimizing resource utilization by avoiding unnecessary redundant transmissions during good channel conditions.
Data Source
AI summary
A radio communication system for an industrial automation system includes at least one radio base station and at least one radio subscriber station that each have a multiplexer unit for data frames that are to be sent redundantly, where the radio base station and the radio subscriber station each transmit data frames that are to be sent redundantly in parallel using multiple different carrier frequencies and each comprise a redundancy handling unit for processing received redundant data frames, and where the redundancy handling units each detect received redundant data frames or restore redundantly sent data frames from different data frame fragments.