Power Line Communication Priority Notification Signal Mechanism
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Solution Overview
Problem
Power line communication networks experience frequent data transmission collisions and reduced performance due to hidden nodes, which cause priority inversion and malfunction in prioritization techniques.
Innovation Solution
A method that adjusts the prioritization section of priority notification signals by increasing transmission power level or decreasing carrier detection threshold values to prevent priority inversion, ensuring that nodes with higher priorities are identified and transmitted first, using protocols like ISO/IEC 15118 and IEC 61850.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If prioritization technique is applied in PLC network, then data transmission order can be controlled, but priority inversion occurs when hidden nodes are present
Solution Approach 1:
The patent applies preliminary action by transmitting a priority notification signal before actual data transmission. This signal includes a prioritization section that预先 indicates the priority level of the upcoming data packet, allowing other nodes to adjust their transmission behavior in advance and prevent priority inversion before it occurs.
Solution Approach 2:
The patent introduces an intermediary mechanism - the priority notification signal with prioritization section - that acts as a mediator between the data source and other network nodes. This intermediary carries priority information that enables hidden nodes to recognize and respect transmission priorities even when they cannot directly observe the high-priority data transmission.
2Area of stationary object
If hidden nodes transmit data without detecting carrier, then network coverage is improved, but data transmission collisions increase
Solution Approach 1:
The patent uses preliminary action by having hidden nodes transmit priority notification signals before actual data. The prioritization section in these signals allows nodes to declare their transmission intentions and priorities in advance, enabling other nodes to defer their transmissions and avoid collisions while still allowing hidden nodes to access the network.
Solution Approach 2:
The patent applies parameter changes by modifying the carrier detection threshold parameter. Hidden nodes use a lower (more sensitive) carrier detection threshold for data transmission compared to priority notification signals. This parameter adjustment allows hidden nodes to detect carriers more sensitively and avoid collisions while maintaining network coverage.
Data Source
AI summary
A method of preventing priority inversion in power line communication includes generating a priority notification signal of each node in order to prioritize a packet transmitted by each of the nodes, decreasing carrier detection threshold value of a prioritization section in the priority notification signal of each of the nodes, increasing transmission power level of the prioritization section in the priority notification signal of each of the nodes, transmitting the priority notification signal generated by each of the nodes, prioritizing the nodes by comparing the prioritization sections of the priority notification signals, and preferentially transmitting a packet of a node with a higher priority. This can solve a priority inversion problem between signals in a network to safely transmit signals without collisions and latency.