WPAN Node Channel Hopping via PRBS Sequence
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Solution Overview
Problem
Media Access Control (MAC) systems in Wireless Sensor Networks are vulnerable to radio interference due to the use of a single frequency, leading to throughput degradation and inability to variably schedule communication link bandwidth.
Innovation Solution
A node device in a beacon-enabled Wireless Personal Area Network (WPAN) generates a pseudo-random binary sequence (PRBS) to create a hopping sequence, which is used to select channels in temporally divided time slots, ensuring pseudo-randomness and variable channel allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single frequency is used for link usage period, then the MAC system can maintain simple operation and consistent communication protocol, but the system becomes weak against interference signals and cannot variably schedule communication link bandwidth
Solution Approach 1:
The patent implements dynamic channel hopping where the MAC system transitions from static single-frequency operation to dynamic multi-frequency hopping. The channel hopping sequence is generated pseudo-randomly and changes over time, allowing the system to adapt to interference conditions while maintaining operational simplicity through automated sequence generation and selection.
2Reliability
If a time-division based channel hopping scheme is implemented, then the system can achieve variable channel allocation and improved interference resistance, but the device complexity increases due to multiple PHY layers and sequence generation requirements
Solution Approach 1:
The patent changes the parameter of channel frequency from static to dynamic by implementing time-division based channel hopping. The system generates pseudo-random channel hopping sequences and switches between different frequency channels according to the sequence, achieving variable channel allocation without requiring complex multi-PHY layer implementations.
3Adaptability or versatility
If channel hopping sequence is defined in MAC upper layer based on user circumstance, then the system can achieve variable scheduling, but pseudo randomness of sequence cannot be guaranteed and multiple PHY layers are required
Solution Approach 1:
The patent implements self-service by generating the pseudo-random channel hopping sequence automatically within the MAC layer using a standardized algorithm (e.g., LFSR or similar pseudo-random sequence generator). The sequence is generated based on predefined parameters such as PAN ID and time, eliminating the need for manual configuration or multiple PHY layers while ensuring guaranteed pseudo-randomness through the mathematical properties of the generation algorithm.
Data Source
AI summary
Provided are a node device of a beacon-enabled Wireless Personal Area Network (WPAN) managing a channel resource and a method thereof. The node device may generate a pseudo random binary sequence (PRBS) and generate a hopping sequence based on a number of available channels using the PRBS, thereby generating a hopping sequence having a characteristic of pseudo randomness and selecting a channel to be hopped, using the hopping sequence.