Adaptive Duplex-Mode Switching for Wireless Self-Interference
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Solution Overview
Problem
Full duplex wireless communications experience self-interference, leading to transmission and/or reception failures due to co-located transmission and reception of signals, which degrade network performance.
Innovation Solution
Wireless communication stations implement duplex-mode remediation by falling back from full duplex mode to sub-band or half duplex mode, or increasing interference cancellation, to mitigate self-interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full duplex mode is implemented to optimize spectrum usage, then spectral efficiency is improved, but self-interference degrades transmission and reception reliability
Solution Approach 1:
The system dynamically switches between full duplex and half duplex modes based on channel conditions and self-interference levels. When self-interference exceeds a threshold, the system transitions from full duplex to half duplex mode, allowing simultaneous optimization of spectral efficiency and transmission reliability through adaptive mode selection.
Solution Approach 2:
The system changes operational parameters by adjusting duplex mode (full duplex/half duplex) and power levels based on channel state information. This parameter adaptation allows the system to maintain high spectral efficiency when conditions permit while ensuring reliable transmission when self-interference becomes problematic.
2Productivity
If full duplex communication is used to increase network capacity, then network throughput is improved, but self-interference causes signal degradation
Solution Approach 1:
The system uses the transmitted signal itself (the source of self-interference) as a reference to estimate and cancel the self-interference component from the received signal. By treating the harmful self-interference as a known reference signal, the system converts the harmful effect into a useful reference for interference cancellation, thereby maintaining high network throughput while mitigating signal degradation.
Solution Approach 2:
The system introduces an interference cancellation mechanism as an intermediary process between transmission and reception. This intermediary step estimates self-interference based on transmitted signal characteristics and subtracts it from the received signal, effectively mediating the conflict between full duplex operation and self-interference mitigation.
3Reliability
If interference cancellation techniques are applied to reduce self-interference, then reception quality is improved, but system complexity increases
Solution Approach 1:
The system performs self-service by using its own transmitted signal as a reference for estimating and canceling self-interference. This self-referential approach eliminates the need for external reference signals or complex cooperative interference cancellation schemes, improving reception quality while keeping system complexity manageable through autonomous operation.
Solution Approach 2:
The system implements feedback-based interference cancellation where the received signal is processed to estimate self-interference components, which are then subtracted from the original received signal. This feedback loop continuously adapts to channel conditions and self-interference levels, maintaining high reception quality through dynamic compensation while using efficient algorithms to control computational complexity.
Data Source
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AI summary
Systems and methods in which one or more wireless communication stations implement duplex-mode remediation to facilitate the signal communication when an issue with respect to self-interference is identified are described. Duplex-mode remediation may be implemented for various communication scenarios, such as for random access phase communications, for communications having different priorities, etc. A wireless communication station may implement one or more changes with respect to the full duplex operation of the wireless communication station based upon determining that an issue with respect to self-interference may be, or is being, experienced, such as to provide for a wireless communication station operating in an in-band full duplex mode to increase interference cancellation and/or to fall back to a sub-band full duplex mode or a half duplex mode, to provide for a wireless communication station operating in a sub-band full duplex mode to increase interference cancellation and/or to fall back to a half duplex mode.