TVWS Mesh Network Frequency Coordination via Centralized Database
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Solution Overview
Problem
Managing communication devices in a television white space (TVWS) environment to maintain communication quality while accommodating a changeable communication environment, particularly in a mesh network structure, is challenging due to the need for efficient frequency allocation and path optimization.
Innovation Solution
A communication management device that stores available frequencies for each geographical position, specifies common frequencies for device pairs, acquires communication qualities, defines best frequencies and paths, and directs devices to use these paths for optimal communication, ensuring high-quality communication across the mesh network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mesh network is formed by multiple communication devices to improve network coverage and connectivity, then network versatility and coverage are improved, but network management complexity and frequency allocation difficulty increase
Solution Approach 1:
The patent introduces a database as an intermediary component that centralizes frequency availability information for multiple geographic positions. The communication management device queries this database to obtain pre-calculated available frequencies, thereby delegating the complex frequency coordination task from the mesh network devices to the centralized database system. This mediator approach resolves the contradiction by maintaining network versatility while reducing management complexity.
Solution Approach 2:
The system performs preliminary frequency availability analysis by storing frequency information in advance for multiple geographic positions in the database. When a communication device needs to operate, the available frequencies are already determined and stored, eliminating the need for real-time complex calculations among mesh network devices. This preliminary action approach allows the mesh network to maintain high adaptability while simplifying operational management.
2Reliability
If frequencies are dynamically allocated based on geographic position to improve communication quality, then communication quality is improved, but frequency management complexity and processing time increase
Solution Approach 1:
The patent implements preliminary frequency allocation by pre-storing available frequency information for multiple geographic positions in the database before actual communication needs arise. When a device requires frequency allocation, the system simply queries the pre-computed database rather than performing real-time spectral analysis and calculations. This approach ensures high communication quality through accurate frequency selection while minimizing allocation time by eliminating complex real-time processing.
Solution Approach 2:
The system maintains different frequency availability information for different geographic positions in the database, allowing each location to have optimized frequency allocations tailored to its specific environment. The communication management device queries the database using its geographic position to obtain locally-optimized frequency recommendations. This local quality approach improves communication quality by considering location-specific factors while reducing time complexity through pre-computed local solutions.
3Productivity
If multiple communication devices share the same frequency band in a mesh network to improve network efficiency, then network efficiency is improved, but interference risk and communication stability deteriorate
Solution Approach 1:
The patent assigns different available frequency sets to different geographic positions based on local interference conditions and regulatory requirements. When multiple communication devices form a mesh network, each device queries the database with its specific geographic position to obtain locally-optimized frequency recommendations. This ensures that devices in different locations use frequencies appropriate to their local environment, reducing interference while maintaining high network efficiency through parallel communications.
Solution Approach 2:
The database acts as an intermediary that provides centralized frequency coordination for the distributed mesh network. By querying the database with geographic position information, communication devices receive pre-coordinated frequency assignments that consider the locations of multiple devices. This intermediary approach enables efficient parallel communications across the mesh network while maintaining stability through centralized frequency management that prevents harmful interference.
Data Source
AI summary
Provided is a management device maintaining communication qualities while accommodating a changeable communication environment. Based on correspondence between each geographical position of plural managed devices and available frequencies thereat, pair available frequencies available in common by arbitrary two managed devices are specified for each pair, and notified to the arbitrary two devices. From managed devices, acquiring pair communication qualities obtained when the pair available frequencies is used, defined is a best pair available frequency capable of obtaining a best pair communication quality. Specifying all of candidate paths connecting the each pair, relaying other managed devices, calculated are, based on the best pair communication quality, path communication qualities in the candidate paths connecting the each pair using the best pair available frequency. Selecting for the each pair a use path having a best quality in the path communication qualities, communication between the each pair is performed by using the use path.