Frequency Hopping Adaptation for Industrial Wireless Interference
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Solution Overview
Problem
Industrial wireless communication networks face interference and data loss due to frequency selective fading and co-channel interference from other networks, such as WLAN, which affects the bit error rate and requires improved communication methods.
Innovation Solution
A method and device for an industrial wireless network that partitions bits into segments transmitted at different frequencies, determines the quality of each segment, forms quality measures, compares them to criteria, and updates the frequency transmission scheme to avoid poor frequencies, allowing the network to adapt and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fast frequency hopping is used to transmit bits in segments at different frequencies, then the number of faulty bits is reduced and communication reliability is improved, but the device complexity increases due to the need for frequency switching and quality monitoring mechanisms
Solution Approach 1:
The patent divides each bit into multiple segments and transmits them at different frequencies. This segmentation allows the system to overcome frequency-selective fading by ensuring that at least some segments are received correctly even if others are corrupted, thereby improving communication reliability without requiring complex error correction codes
Solution Approach 2:
The receiving node monitors the quality of received segments and provides feedback to the transmitting node about which frequencies are experiencing interference. This feedback mechanism enables dynamic adaptation of the frequency hopping sequence, allowing the system to avoid problematic frequencies and maintain reliable communication while managing device complexity through intelligent control
2Productivity
If multiple wireless networks operate in the same area using the same frequency, then spectrum utilization is improved, but co-channel interference increases and causes data packet loss
Solution Approach 1:
The patent implements dynamic frequency selection where the frequency hopping sequence is adapted based on real-time quality measurements. When interference from other networks is detected on certain frequencies, the system dynamically adjusts by avoiding those frequencies in future transmissions, allowing multiple networks to coexist by reducing persistent co-channel interference while maintaining efficient spectrum utilization
Solution Approach 2:
The system changes the frequency parameter dynamically based on observed interference conditions. By monitoring segment quality and identifying problematic frequencies, the system modifies its frequency hopping pattern to avoid interfered channels, thereby reducing packet loss while allowing other networks to operate on the frequencies they need
Data Source
AI summary
A transmitting node in an industrial wireless network transmits a first number of bits to a receiving node, where at least one bit is partitioned into segments and each segment is transmitted at a different frequency according to a frequency transmission scheme. The receiving node receives the number of bits, determines the quality of each segment of a received bit, collects quality determinations of segments, forms a quality measure for each frequency through combining quality determinations of the corresponding frequency, compares each quality measure with a quality measure criterion, determines at least one frequency that does not fulfill the quality measure criterion and informs the transmitting node about frequencies for which the corresponding quality measures do not fulfill the quality measure criterion. The transmitting node receives the information and updates the frequency transmission scheme.