Power Line Communication Beacon Synchronization
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Solution Overview
Problem
Power line communication systems face challenges in maintaining high data rates and quality of service due to varying noise and frequency response characteristics caused by AC line cycle phase variations, which are not effectively addressed by existing channel adaptation techniques.
Innovation Solution
A method and system that utilize repeated beacon transmissions synchronized to the AC power line waveform to assign time slots and adaptation parameters based on varying channel characteristics, ensuring reliable and high-data-rate communication by optimizing transmission parameters according to different phase regions of the AC cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If channel adaptation is performed to maximize data rate, then productivity is improved, but the system complexity increases due to dynamic parameter adjustment
Solution Approach 1:
The patent applies periodic action by synchronizing beacon transmissions and channel adaptation to the AC line cycle phase. The system divides the AC cycle into multiple phase regions and performs channel adaptation periodically at beacon intervals, allowing the system to exploit the periodic nature of power line channel variations. This reduces complexity by using predetermined phase region boundaries rather than continuous adaptation, while maintaining high data rates through phase-specific parameter optimization.
2Adaptability or versatility
If multiple phase regions are used for channel adaptation, then adaptability is improved, but the loss of time increases due to coordination overhead
Solution Approach 1:
The patent applies preliminary action by pre-defining phase region boundaries and adaptation parameters for each phase region before actual data transmission. The coordinator station determines the number of phase regions and their boundaries in advance, and stations prepare their transmission parameters based on predetermined rules. This eliminates the need for real-time negotiation and reduces coordination time, while maintaining adaptability through phase-specific parameter selection.
3Reliability
If beacon transmissions are synchronized to AC line cycle, then reliability is improved, but the device complexity increases due to synchronization requirements
Solution Approach 1:
The patent applies self-service by enabling stations to autonomously determine their transmission parameters based on the synchronized beacon transmissions. Each station independently identifies the AC line cycle phase, determines the appropriate phase region, and selects transmission parameters without requiring complex centralized coordination. The coordinator station simply provides synchronized beacons with phase information, and stations self-configure their adaptations, reducing overall system complexity while improving reliability through phase-synchronized transmission.
Data Source
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AI summary
A method and corresponding system for operating in a network in which stations (102A, 102B, 104A, 104B, 104C) communicate over a shared medium (110) are presented. The shared medium has at least one varying channel characteristic that varies approximately periodically. The method includes providing repeated beacon transmissions (402) from a coordinator station for coordinating transmissions among a plurality of the stations, wherein at least some beacon transmissions are synchronized to the varying channel characteristic; and transmitting from a first station to at least one receiving station during a time slot determined based on at least one of the beacon transmissions received by the first station from the coordinator station.