Dual-Radio LTE WLAN Interference Cancellation
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Solution Overview
Problem
As cellular networks become congested, the increasing use of unlicensed spectrum for offloading traffic leads to undesirable interference between different radio access technologies (RATs), such as LTE and WLAN, which existing systems struggle to effectively mitigate.
Innovation Solution
A dual-radio mobile device is equipped with multiple radios to receive and process convoluted signals, where one radio reconstructs its signal to cancel interference from another RAT's signal, allowing the LTE radio to identify and isolate the clean LTE signal from the convoluted signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple radios operate simultaneously over shared spectrum, then network capacity and traffic offloading are improved, but interference between different RATs increases
Solution Approach 1:
The patent converts the harmful interference signal from one RAT into a useful component for cancellation. The WLAN radio reconstructs the interfering signal and sends it to the LTE radio, which subtracts it from the received convoluted signal, transforming the harmful interference into a beneficial cancellation mechanism that improves signal quality
Solution Approach 2:
The patent introduces an intermediary signal processing mechanism where the WLAN radio acts as a mediator that reconstructs the interfering signal and provides it to the LTE radio. This intermediary process enables the LTE radio to identify and cancel the specific interference pattern without directly interfering with WLAN operations
2Reliability
If interference cancellation processing is performed, then signal quality is improved, but processing complexity increases
Solution Approach 1:
The patent segments the interference cancellation process into distinct functional modules: the WLAN radio reconstructs the interfering signal separately, the reconstructed signal is transmitted to the LTE radio, and the LTE radio performs the subtraction operation. This segmentation allows each component to perform a specific function, managing overall system complexity through modular processing
3Reliability
If dynamic interference cancellation is implemented, then communication quality is improved, but energy consumption increases
Solution Approach 1:
The patent implements dynamic interference cancellation where the system continuously monitors signal conditions and adapts the cancellation process in real-time. The WLAN radio dynamically reconstructs the interfering signal based on current channel conditions, and the LTE radio dynamically subtracts the reconstructed signal, allowing the system to optimize performance based on varying interference levels while managing energy consumption through adaptive processing
Data Source
AI summary
Methods, systems, and devices are described for eliminating interference from a convoluted signal comprising several signals of different radio access technologies (RATs), such as a Long Term Evolution (LTE) signal and wireless local area network (WLAN) signal, in an unlicensed or shared radio frequency spectrum band are described. In accordance with the present disclosure, a dual-radio mobile device may utilize a multiple radios to assist in the operation of interference cancellation. Specifically, in some examples, a first radio (e.g., WLAN radio) may process the received convoluted signal to reconstruct a first signal (e.g., WLAN signal). The reconstructed first signal may be utilized by a second radio (e.g., LTE radio) to identify a second signal (e.g., LTE signal) in the received convoluted signal by cancelling or removing the reconstructed first signal from the convoluted signal.