TV White Space Geo-Location Database Architecture
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Solution Overview
Problem
Current geo-location database regulations for TV white spaces waste significant spectrum opportunities by over-protecting entire coverage areas of TV transmitters, leading to temporal and spatial spectrum holes, especially in urban areas with high demand for wireless bandwidth.
Innovation Solution
A cloud-based architecture that leverages collaborative spectrum sensing and ambient sensors from devices like smartphones to dynamically track the state and location of TV receivers, providing real-time, fine-grained TV white space awareness, enhancing the scalability and reliability of geo-location databases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional geo-location databases protect the entire coverage area of TV transmitters, then TV receivers are protected from interference, but significant spectrum opportunities are wasted due to over-protection
Solution Approach 1:
The patent segments the TV transmitter coverage area into multiple geographic cells (e.g., using GPS coordinates and radius parameters). Each cell is independently evaluated for TV receiver presence through database queries, allowing selective authorization of white space channels in specific cells rather than blanket protection across the entire coverage area. This enables spectrum sharing in areas without active receivers while maintaining protection where receivers exist.
Solution Approach 2:
The patent introduces a database system as an intermediary between TV transmitters and WSDs. This database stores geographic information about TV receivers and provides real-time queries to determine whether specific cells contain active receivers. The intermediary enables dynamic, location-specific spectrum authorization rather than static blanket protection, resolving the contradiction between reliable protection and spectrum efficiency.
2Reliability
If WSDs use spectrum sensing with a very low threshold of -107 dbm to detect TV transmissions, then interference protection is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent uses a centralized database as an intermediary that performs the complex spectrum sensing and analysis functions centrally rather than requiring each WSD to perform sophisticated sensing. The database receives information about TV transmissions and receiver locations, processes this information to determine available white space channels, and provides authorization decisions to WSDs. This eliminates the need for complex sensing hardware and software in individual devices while maintaining reliable interference protection.
Solution Approach 2:
The patent replaces the mechanical/electronic spectrum sensing system (requiring specialized hardware and complex signal processing) with an information-based system using database queries and geographic information processing. Instead of physically sensing radio signals at -107 dbm threshold, the system uses digital database lookups based on GPS coordinates to determine spectrum availability, significantly reducing device complexity while maintaining protection reliability.
3Reliability
If geo-location databases protect the entire coverage area of TV transmitters, then interference mitigation is ensured, but temporal and spatial spectrum holes are wasted
Solution Approach 1:
The patent implements a dynamic system where the database can be queried in real-time to determine current spectrum availability. Instead of static blanket protection, the system evaluates each cell's current state by checking for active TV receivers at the time of the query. This allows the spectrum authorization to change dynamically based on actual receiver activity, enabling WSDs to utilize spectrum during temporal holes when receivers are inactive while maintaining protection when receivers are active.
Solution Approach 2:
The patent applies different spectrum authorization decisions to different local areas (cells) within the coverage zone. Each cell is evaluated independently based on its specific characteristics and current receiver activity. This allows spectrum sharing in local areas with no active receivers while maintaining exclusive protection in areas where receivers are present, optimizing both interference mitigation and spectrum utilization at the local level.
Data Source
AI summary
This invention describes a cloud-based architecture that orchestrates the detection and dissemination of highly-dynamic, real-time, and fine-grained TV white space information to improve spectrum information used for White Space Devices (WSDs). Wasted spectrum opportunities were first identified, both temporal and spatial, due to the current approach of white spaces detection. This invention introduces a next generation of geo-location databases capable of tracking the state of the relatively static TV transmitters and the highly dynamic TV receivers. A quantitative evaluation of the potential gain in white space availability for large scale deployments of this novel architecture demonstrated significant improvement in the availability of white spaces.