Power Line Communication Apparatus Time Slot Allocation
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Solution Overview
Problem
Conventional power line communication systems fail to guarantee quality of service (QoS) for streaming data, such as video or audio, due to variations in transmission path conditions and noise, and lack the ability to allocate time slots effectively across different communication interfaces like Ethernet.
Innovation Solution
A power line communication apparatus and method that includes a data relay unit with a time slot setting function, allowing for the reservation and allocation of time slots based on data format and type, ensuring QoS by integrating power line communication with other interfaces like Ethernet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If power line communication is used to avoid installing separate wire lines, then ease of operation is improved, but communication quality deteriorates due to noise and impedance variations
Solution Approach 1:
The system performs transmission path prediction and measures transmission path conditions (S/N ratio) before actual data communication begins. This preliminary action allows the bridge unit to determine appropriate modulation factors and set communication parameters in advance, ensuring reliable communication quality while using the convenient power line infrastructure.
2Productivity
If modulation factor is increased to increase data transmission rate, then productivity is improved, but communication quality deteriorates due to reduced S/N ratio
Solution Approach 1:
The bridge unit dynamically adjusts the modulation factor based on real-time transmission path conditions. When the S/N ratio is high, the modulation factor is increased to maximize data transmission rate. When the S/N ratio deteriorates, the modulation factor is decreased to maintain communication quality. This dynamic adaptation resolves the contradiction between productivity and reliability.
3Reliability
If time slot allocation is implemented to guarantee QoS for streaming data, then reliability is improved, but device complexity increases
Solution Approach 1:
The system segments the communication time into dedicated time slots for different types of data traffic. Streaming data (video, audio) is allocated specific time slots with guaranteed bandwidth and QoS parameters, while other data uses remaining time slots. This segmentation allows the bridge unit to manage complex QoS requirements through structured time division, making the complexity more manageable and systematic.
4Reliability
If transmission path prediction is performed to optimize communication parameters, then communication quality is improved, but loss of time occurs during prediction and measurement
Solution Approach 1:
The system performs transmission path prediction and measurement as a preliminary action before actual data communication begins. By completing these measurements in advance, the system establishes optimal communication parameters (modulation factors, bit rates) before data transmission starts. This approach minimizes the impact of prediction time on actual communication efficiency, as the prediction is done once before communication begins rather than continuously during data transmission.
Data Source
AI summary
The PLC 20 adaptor corresponding to a power line communication apparatus has four PLC bridges 30A to 30D, each of which is correspondingly connected to Ethernet communication connectors 26A to 26D, operation mode setting switches 27A to 27D, display units 28A to 28D. Each PLC bridge 30A to 30D includes a PLC modem unit 301, a bridge unit 302, an Ethernet IF unit 303, and a communication control unit 304. The communication control unit 304 obtains data type information on the basis of setting conditions of switches 27A to 27D corresponding to each communication port. Since the time slot required for the communication link corresponding to the communication port of the PLC network can be obtained on the basis of the data type information, the reservation request can be transmitted to the control terminal.