WWAN-WLAN Channel Filtering for 2.4 GHz Interference Avoidance
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Solution Overview
Problem
The coexistence of WWAN and WLAN modules in terminal devices leads to interference due to overlapping frequency ranges, particularly in the 2.4 GHz spectrum, causing signal blocking and in-band noise, and existing solutions either waste bandwidth or require complex hardware and software configurations.
Innovation Solution
Implementing two sets of filters in WWAN and WLAN modules, where the distance between frequency ranges of the filters exceeds a threshold, allowing simultaneous operation without interference by selecting non-interfering channels based on mapping tables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If WWAN and WLAN modules operate simultaneously in overlapping frequency ranges, then communication functionality is enhanced, but signal interference and in-band noise increase
Solution Approach 1:
The patent segments the frequency spectrum by introducing frequency domain division, where different filters are assigned to different frequency ranges. The WWAN module uses a first filter for a first frequency range while the WLAN module uses a second filter for a second frequency range, effectively dividing the spectrum to avoid interference while maintaining simultaneous operation capability.
Solution Approach 2:
The patent applies local quality by assigning different filtering characteristics to different frequency ranges. Each filter is optimized for its specific frequency range, with the first filter tailored for WWAN frequencies and the second filter tailored for WLAN frequencies, allowing each module to operate optimally in its designated frequency band without interfering with the other.
2Object-affected harmful factors
If traditional interference avoidance methods are used, then signal interference is reduced, but bandwidth is wasted or device complexity increases
Solution Approach 1:
The patent merges the filtering functions of both WWAN and WLAN modules into a unified frequency domain division scheme. By coordinating the operation of the first and second filters across different frequency ranges, the system achieves interference avoidance without requiring separate complex interference management systems for each module, thereby reducing overall device complexity while maintaining effective bandwidth utilization.
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 avoids interference without sacrificing bandwidth or adding complex controllers, maintaining efficient communication and reducing costs by optimizing channel selection.
Implementation Method 1
control a first filter to process a first signal in a first working channel of a first frequency band
Implementation Method 2
control a second filter to process a second signal in a second working channel of a second frequency band
Data Source
AI summary
In implementations of the present disclosure, there is provided an approach for reducing interference between channels of a wireless wide area network (WWAN) and channels of a wireless local area network (WLAN). A method comprises determining a first working channel in a first frequency band of a WWAN, and selecting a first filter from a first set of filters corresponding to the first frequency band based on the first working channel. Then, a second filter from a second set of filters corresponding to a second frequency band in a WLAN and a second working channel in the second frequency band are selected. The determined first working channel and the selected second working channel are used to transmit data. Implementations of the present disclosure can help the terminal device to use channels of WWAN and WLAN simultaneously and reduce interference between channels of WWAN and WLAN.