TVWS Node Interference Mitigation via Dynamic Channel Selection
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Solution Overview
Problem
Television white space (TVWS) devices experience interference from TV towers, impairing their ability to transmit and receive data effectively, especially when operating as nodes within a network, leading to impaired interoperation and network performance.
Innovation Solution
A computer-implemented method configures nodes to communicate on TVWS frequencies by retrieving quality of service metrics from a database, determining optimal operating parameters to mitigate interference, and adjusting channel settings to ensure reliable communication despite interference from nearby TV towers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If TVWS devices operate close to TV towers to expand network coverage, then network coverage area is improved, but communication reliability deteriorates due to interference from TV towers
Solution Approach 1:
The system dynamically changes operating parameters including frequency channel selection and transmission power levels based on detected interference conditions. When TV tower interference is detected, the system switches to alternative frequencies and adjusts power levels to maintain reliable communication while operating near TV towers, thus resolving the contradiction between coverage expansion and communication reliability.
2Productivity
If TVWS devices use frequencies close to TV tower frequencies to maximize spectrum utilization, then spectrum utilization is improved, but communication quality deteriorates due to frequency interference
Solution Approach 1:
The system continuously monitors frequency interference levels and dynamically switches between available TVWS channels. When interference on a particular frequency is detected, the system transitions to alternative frequencies within the TVWS band, maintaining high spectrum utilization while avoiding frequencies with TV tower interference to preserve communication quality.
3Reliability
If TVWS devices increase transmission power to overcome interference, then signal strength is improved, but energy consumption increases
Solution Approach 1:
The system dynamically adjusts transmission power levels based on real-time interference conditions and signal quality requirements. Rather than maintaining high power continuously, the system uses adaptive power control to transmit at the minimum necessary power level to achieve reliable communication, thus maintaining signal strength while reducing overall energy consumption.
4Reliability
If TVWS devices perform frequent channel scanning to avoid interference, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The system performs preliminary channel scanning and interference detection during device initialization and setup phases. By pre-identifying and avoiding frequencies with TV tower interference before actual communication begins, the system reduces the need for frequent scanning during operation, thus maintaining communication reliability while minimizing the complexity and overhead of continuous scanning operations.
Data Source
AI summary
Nodes within a network are configured to communicate with one another on one or more television white space (TVWS) frequencies that may be subject to interference caused by nearby TV towers. In order to mitigate that interference, the nodes may be configured to communicate according to specific operating parameters. The operating parameters may be generated based on expected interference levels caused by the nearby TV towers or QOS metrics associated with available channels. The nodes may also update a private database to reflect the expected interference levels or measured QOS metrics for different channels.