TVWS Node Device Neighbor Discovery via Sub-Channel Energy Comparison
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Solution Overview
Problem
In TV white space (TVWS) communication environments, the neighbor discovery delay increases as the number of communication channels grows, limiting the scalability and flexibility of smart grid networks.
Innovation Solution
A node device and network system that compares energy levels of sub-channels to determine available channels, using a decision unit to calculate a correlation value and decide channel availability, allowing for efficient beacon discovery and network connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of communication channels is increased to provide more DTV channels, then channel availability and network capacity are improved, but neighbor discovery delay increases rapidly
Solution Approach 1:
The patent segments the channel scanning process into two phases: first scanning only pilot channels to identify available DTV channels, then scanning only within those identified channels for beacons. This segmentation reduces the total number of channels that need to be scanned for neighbor discovery, thereby reducing discovery delay while maintaining the ability to utilize all available channels.
Solution Approach 2:
The patent extracts the pilot channel scanning step as a separate preliminary operation before the main beacon scanning process. By taking out the pilot channel assessment as a distinct phase, the system can quickly identify which DTV channels are available without scanning all sub-channels immediately, thus reducing overall neighbor discovery time.
2Measurement precision
If all DTV channels are scanned to ensure complete channel assessment, then channel selection accuracy is improved, but energy consumption and scanning time increase
Solution Approach 1:
The patent divides channel assessment into two stages: first assessing only pilot channels to determine DTV channel availability, then assessing sub-channels only within the identified available DTV channels. This segmented approach maintains measurement precision for channel selection while significantly reducing the total number of channels that require energy-consuming scanning operations.
Solution Approach 2:
The patent applies different scanning intensities to different channel regions: pilot channels are scanned with minimal assessment to identify available DTV channels, while sub-channels are scanned with full assessment only within the boundaries of identified available DTV channels. This local quality differentiation optimizes energy consumption while maintaining accurate channel selection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces neighbor discovery delays, improves energy efficiency, and enhances the reliability and scalability of TVWS networks by minimizing unnecessary scanning operations.
Implementation Method 1
the energy level of the first sub-channel and the energy level of the second sub-channel may be measured by using clear channel assessment (CCA)
Data Source
AI summary
A node device using a TV white space (TVWS) includes a decision unit for comparing energy levels of a first sub-channel and at least one second sub-channel adjacent to the first sub-channel among a plurality of sub-channels with respect to a digital TV (DTV) channel including the plurality of sub-channels and deciding whether the DTV channel is an available channel, and a discovery unit for, if the DTV channel is decided as the available channel, discovering a beacon by scanning the first sub-channel in the DTV channel.