SDR Adaptive Profiles for LTE-U Wi-Fi Interference
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Solution Overview
Problem
The proliferation of wireless communication systems using unlicensed frequency bands leads to increased interference in RF environments, particularly between LTE networks and Wi-Fi networks, causing severe interference and unacceptable data throughput in Wi-Fi devices.
Innovation Solution
Implementing a method and apparatus that allows devices with software-defined radios (SDRs) to adapt their operating behavior based on network RF environment conditions by switching between predefined profiles stored in a database, which can modify MAC profiles, forward error correction codes, and RF baseband signaling to minimize interference and optimize resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Wi-Fi devices use back-off behavior to avoid interference, then transmission errors are reduced, but data throughput becomes unacceptable
Solution Approach 1:
The patent implements dynamic adaptation of Wi-Fi device behavior through multiple profiles (aggressive, moderate, conservative) that can be switched based on detected interference levels. Instead of static back-off behavior, the system dynamically adjusts transmission parameters including back-off counters, contention window sizes, and power levels to optimize both reliability and throughput under varying interference conditions from LTE-U networks
Solution Approach 2:
The system changes multiple transmission parameters simultaneously when switching profiles: back-off counter reset values, contention window minimum/maximum values, transmit power levels, and modulation schemes. These parameter changes allow the Wi-Fi network to adapt its behavior from aggressive (high throughput, low reliability) to conservative (low throughput, high reliability) based on the detected LTE-U interference environment
2Productivity
If LTE networks transmit at high power levels and hold channels for long periods, then LTE network performance is improved, but Wi-Fi network interference increases
Solution Approach 1:
The patent converts the harmful LTE-U interference into useful information for adaptive behavior adjustment. By detecting LTE-U presence and interference levels, the system identifies when aggressive Wi-Fi transmission would cause harm and switches to conservative profiles that reduce Wi-Fi transmissions during high interference periods, thereby benefiting from the LTE-U network's channel holding while minimizing mutual interference
Solution Approach 2:
The system implements continuous feedback monitoring of the RF environment to detect LTE-U transmissions and measure interference levels. This feedback drives automatic profile switching and parameter adjustment, allowing Wi-Fi devices to respond to LTE-U network behavior in real-time and adapt their transmission strategy to minimize interference while maintaining acceptable performance
3Object-affected harmful factors
If devices adapt behavior based on RF environment, then interference effects are reduced, but device complexity increases
Solution Approach 1:
The patent segments the adaptive behavior into discrete, pre-defined profiles (aggressive, moderate, conservative) rather than continuous adjustment. Each profile contains a specific set of transmission parameters that can be switched between without complex real-time calculation. This segmentation simplifies device implementation while still providing effective interference adaptation through profile-based behavior change
Data Source
AI summary
Methods and apparatus in a wireless network that allow devices, such as client devices and access points (APs), having software defined radios (SDRs) to change operating behavior depending on network RF environment conditions are disclosed. The devices may be instructed to operate according to differently defined behavior profiles that may be chosen based on RF environment conditions. The profiles may be stored in a database. A particular profile may be obtained from the database for one or more devices based on an interference level within an RF environment of the devices. The profiles may be implemented to change device operating behavior so that interference is reduced or minimized in higher levels of interference. The profiles may also be implemented to change device behavior so that interference is reduced in lower levels of interference while also freeing up resources for more efficient use in the network during lower levels of interference.