Adaptive Channel Bandwidth Selection for White Space Interference
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Solution Overview
Problem
Communication devices operating in unlicensed white space spectrum face challenges due to variable bandwidth, interference from other devices, and limitations of existing database systems, which fail to account for unlicensed user interference and changing propagation conditions.
Innovation Solution
A communication device that adapts its bandwidth usage based on the activity of other devices by detecting or predicting interference, selecting a portion of the channel bandwidth, and adjusting the spreading factor and center frequency to minimize interference and optimize bandwidth use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a communication device uses the full bandwidth of an available white space channel, then data transmission rate is improved, but interference with other devices operating in the same spectrum increases
Solution Approach 1:
The communication device applies local quality by using only a portion of the available channel bandwidth rather than the full bandwidth. This allows the device to concentrate its transmission energy in a specific frequency range, achieving adequate data transmission rates while reducing interference to other devices operating in adjacent frequency portions of the white space spectrum.
Solution Approach 2:
The device dynamically adjusts the bandwidth portion it uses based on detected interference conditions and activities of other devices. By making the bandwidth allocation adaptive rather than fixed, the system can optimize between transmission rate and interference reduction in real-time according to the spectral environment.
2Reliability
If a database system is used to determine channel availability, then compliance with incumbent protection requirements is improved, but the system becomes vulnerable to abnormal propagation conditions and irrelevant information
Solution Approach 1:
The communication device implements feedback by actively monitoring the spectral environment and interference conditions in real-time. This feedback mechanism allows the device to detect abnormal propagation conditions and adjust its transmission parameters accordingly, making the system adaptable to changing conditions rather than relying solely on static database information.
Solution Approach 2:
The device performs preliminary actions by detecting interference and selecting an appropriate bandwidth portion before actual data transmission begins. This proactive approach ensures compliance with incumbent protection while adapting to current propagation conditions, rather than reacting to problems after they occur.
3Object-generated harmful factors
If the communication device adapts bandwidth usage based on detected interference, then interference with other devices is reduced, but device complexity increases
Solution Approach 1:
The communication device applies self-service by autonomously monitoring interference conditions and selecting its own bandwidth portion without requiring complex external coordination or control systems. The device independently adapts its transmission parameters based on detected environmental conditions, reducing the need for additional control infrastructure.
Data Source
AI summary
A communication device for communicating via a wireless network that is permitted to operate only in communication channels that are not designated for use by another network, the communication device being configured to determine that it is permitted to use a communication channel and use only a part of the bandwidth of that communication channel in dependence on an activity associated with a device operating outside of the wireless network.