PLC Frequency Band Allocation for Multi-Slave Communication
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Solution Overview
Problem
In power stations, Power Line Communication (PLC) systems face inefficiencies and reliability issues due to bus congestion and noise interference, limiting communication efficiency and reliability, especially when multiple slave nodes communicate with a single master node.
Innovation Solution
The operating frequency range is divided into multiple frequency bands, allowing the master node to communicate with different slave nodes in separate bands, using various communication manners like broadcast, multicast, and unicast, to avoid interference and improve efficiency and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PLC uses a single frequency range for communication between master node and multiple slave nodes, then the communication system is simple, but bus congestion occurs and communication efficiency deteriorates
Solution Approach 1:
The patent divides the PLC frequency range into multiple frequency bands, with each band dedicated to communication with a specific slave node. This segmentation allows the master node to communicate with multiple slave nodes simultaneously without bus congestion, directly resolving the technical contradiction by improving communication efficiency through frequency resource partitioning.
2Reliability
If PLC bus is occupied by one communication pair, then communication reliability between that pair is maintained, but other nodes cannot communicate and system reliability deteriorates
Solution Approach 1:
By segmenting the frequency spectrum into multiple independent bands, the patent enables parallel communication channels between the master node and different slave nodes. This eliminates the waiting time caused by bus occupation while maintaining communication reliability through dedicated frequency resources for each node pair.
Solution Approach 2:
The patent transitions from time-division multiplexing to frequency-division multiplexing, adding a frequency dimension to the communication system. This allows multiple communication pairs to operate simultaneously in different frequency bands, eliminating sequential access delays and improving both reliability and response time.
3Reliability
If PLC communicates over a fixed frequency range, then the communication system is simple to implement, but noise interference degrades communication reliability
Solution Approach 1:
The patent segments the frequency range into multiple bands and assigns different bands to different slave nodes. This segmentation isolates noise interference to specific frequency bands, preventing it from affecting all communications. The system can select cleaner frequency bands for communication, improving reliability while managing complexity through structured frequency allocation.
4Productivity
If master node communicates with one slave node at a time, then communication protocol is simple, but communication efficiency deteriorates due to bus congestion
Solution Approach 1:
The patent implements frequency-division multiplexing by segmenting the available spectrum into multiple bands, each dedicated to a specific slave node. This allows the master node to engage in simultaneous communications with multiple slave nodes through different frequency bands, dramatically improving communication efficiency while maintaining relatively simple protocols within each band.
Data Source
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AI summary
The present invention provides a communication method, apparatus and system, applied to a master node. The method comprises: dividing a preset operating frequency range into multiple frequency bands; determining a slave node for communication corresponding to each frequency band; and according to a preset communication mode, communicating with the slave node corresponding to each frequency band. An operating frequency range can be divided into multiple frequency bands, communication with different slave nodes is performed in different frequency bands, and mutual influence is avoided, thereby improving the communication efficiency and reliability.