PLCA Beacon Temporal Spreading for EMI Reduction

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Solution Overview

Problem

Existing Ethernet communication systems, particularly those following the IEEE 802.3cg standard (10SPE), face challenges in reducing electromagnetic interference (EMI) during PHY layer collision avoidance (PLCA) operations.

Innovation Solution

The implementation of temporal spreading or dithering of beacon signals in 10SPE networks, where the transmission of beacon signals is delayed based on the completion of previous transmission cycles and EMI levels, effectively reduces EMI by modulating the periodicity of beacon signals.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If beacon signals are transmitted periodically at fixed intervals in PLCA-based networks, then network synchronization and coordination are maintained, but peak electromagnetic interference (EMI) levels increase due to concentrated frequency energy

Engineering Contradiction:

Improvenetwork synchronizationVSAvoidpeak EMI levels

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent applies periodic action by introducing variable delays between beacon signal transmissions. Instead of fixed periodic intervals, the beacon signals are transmitted at variable intervals within a defined range, transforming the regular periodic pattern into a modified periodic pattern that spreads frequency energy while maintaining network synchronization through controlled timing variations.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent changes the temporal parameter of beacon signal transmission by introducing variable delays. The delay value is adjusted dynamically within a specified range, modifying the transmission timing parameter to spread the frequency footprint of EMI noise across a broader spectrum, thereby reducing peak EMI levels while preserving network coordination functionality.

Inventive Principle:

Principle #35Parameter changes

2Object-generated harmful factors

If beacon signal transmission timing is adjusted to reduce EMI, then peak EMI levels decrease, but network coordination complexity increases

Engineering Contradiction:

Improvepeak EMI levelsVSAvoidtransmission timing control

Core Design Contradiction:

Object-generated harmful factorsVSDevice complexity

Solution Approach 1:

The patent implements dynamics by making the beacon signal transmission timing flexible rather than fixed. Variable delays are introduced that can adapt to different network conditions, allowing the system to dynamically adjust transmission timing within defined constraints. This dynamic approach reduces peak EMI while managing complexity through bounded variability rather than uncontrolled complexity.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20250158849A1EMI Reduction in PLCA-Based Networks Through Beacon Temporal Spreading

Publication Date: 2025.05.15 MICROCHIP TECHNOLOGY INC

AI summary

An apparatus may be communicatively coupled to other nodes in a network. The apparatus may include a control circuit configured to repeatedly issue transmission cycles to the other nodes. A given transmission cycle may include a least one send slot for each of the other nodes to send data. The control circuit may be configured to initiate transmission cycles by issuing beacon signals to the other nodes. The control circuit may be configured to determine when to issue a beacon signal in a given transmission cycle by determining that all of the other nodes have completed all associated send slots in an immediately previous transmission cycle and based upon a determination of the completion of the other nodes' transmission, delaying transmission of the beacon signal for the given transmission cycle.