Communication System with Repeated Signaling for Noisy Industrial Control
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Solution Overview
Problem
Conventional communication systems experience deterioration of performance due to transmission delays caused by noise interference in industrial environments, leading to inadequate control of devices like cameras.
Innovation Solution
A communication system that includes a first communication unit transmitting data signals with identification codes, allowing the second communication unit to return ACK signals, and repeatedly transmitting the same data signal at shorter intervals than a failure determination time, with the second unit processing only the first received signal with the same identification code.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control device waits for a predetermined standby time before re-transmitting data signals, then communication interference caused by noise is addressed, but transmission delay increases and communication performance deteriorates
Solution Approach 1:
The transmitter performs preliminary repeated transmissions of the data signal before the failure determination time elapses. By proactively re-transmitting the signal multiple times within the waiting period rather than waiting passively, the system ensures that at least one copy reaches the receiver promptly, reducing effective transmission delay while maintaining reliability in noisy industrial environments
Solution Approach 2:
The transmitter implements periodic re-transmission of the data signal at intervals during the standby period. This periodic action pattern ensures continuous signal presence in the communication channel, increasing the probability of successful reception without requiring the full standby time to elapse, thus reducing overall transmission delay while maintaining communication reliability
2Reliability
If the second communication unit processes all repeatedly transmitted data signals, then no data is lost, but processing time increases and communication efficiency decreases
Solution Approach 1:
The second communication unit performs preliminary identification of duplicate data signals using identification codes before full processing. By checking the identification code against previously received signals in advance, the unit can immediately recognize and exclude duplicates without undergoing complete processing, thus maintaining data reception reliability while significantly improving processing efficiency
Solution Approach 2:
The second communication unit extracts and processes only the first received data signal with each unique identification code, separating the useful signal from redundant repetitions. This extraction approach ensures that each unique data signal is processed reliably while eliminating unnecessary processing of duplicate signals, thereby maintaining reliability while enhancing overall processing efficiency
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A first communication unit 11 repeatedly transmits the same data signal as a transmitted data signal to a second communication unit 23 at shorter time intervals than an acknowledgement time in which an ACK signal is returned from the second communication unit 23 without any failure. As a result, even when the transmitted data signal is garbled in the middle of a transmission path due to noise, the second communication unit 23 can rapidly receive the repeatedly transmitted same data signal.