Adaptive Duplex Mode Switching for Self-Interference Management
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Solution Overview
Problem
The co-time co-frequency full duplex (CCFD) communication system faces self-interference issues that reduce signal-to-noise ratio, especially when devices are farther from the base station, making it difficult to maintain normal operation and achieve high data transfer rates.
Innovation Solution
A method where a base station device and terminal device adaptively switch between half duplex and full duplex transmission modes based on a signal quality indicator and interference cancellation capability, allowing the terminal device to determine the most suitable mode and communicate this to the base station for setting the appropriate transmission mode, thereby managing self-interference and optimizing data transfer rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device increases transmission energy to maintain signal quality at greater distances, then the signal quality is maintained, but self-interference increases and CCFD system operation cannot be maintained
Solution Approach 1:
The patent implements dynamic switching between half-duplex and full-duplex transmission modes based on real-time signal quality indicators and interference cancellation capability assessments. The terminal device adaptively adjusts its transmission mode rather than using a fixed mode, allowing optimization of signal quality while controlling self-interference levels through mode selection.
Solution Approach 2:
The system changes operational parameters by switching between different transmission modes (half-duplex vs. full-duplex) based on measured signal quality indicators and interference cancellation capabilities. This parameter change allows the system to maintain signal quality at various distances while managing self-interference through appropriate mode selection.
2Productivity
If the CCFD system is used to double spectrum efficiency, then data transfer rate is improved, but self-interference reduces signal-to-noise ratio and system reliability
Solution Approach 1:
The patent implements dynamic mode switching that allows the system to operate in full-duplex mode when signal quality and interference cancellation capability are sufficient (achieving doubled spectrum efficiency), and switch to half-duplex mode when self-interference degrades signal-to-noise ratio. This dynamic adaptation resolves the contradiction by allowing high productivity when conditions permit while maintaining reliability when interference becomes problematic.
Solution Approach 2:
The system uses feedback mechanisms where the terminal device measures signal quality indicators and interference cancellation capability, then reports these to the base station which determines the appropriate transmission mode. This closed-loop feedback allows the system to maintain optimal data transfer rates while preventing self-interference from degrading signal-to-noise ratio below acceptable levels.
3Productivity
If adaptive switching between half duplex and full duplex is implemented, then data transfer rate increases and system operation is maintained, but device complexity increases
Solution Approach 1:
The terminal device performs self-assessment of its interference cancellation capability and signal quality indicators, then autonomously determines the appropriate transmission mode and reports this determination to the base station. This self-service approach reduces the need for complex base station processing while enabling adaptive mode switching that increases data transfer rates.
Solution Approach 2:
The patent divides the transmission mode selection process into separate functional segments: the terminal device measures signal quality and interference cancellation capability, determines suitable modes, and reports findings; the base station receives this information and makes the final mode assignment. This segmentation distributes complexity across multiple devices rather than concentrating it in one location, managing overall system complexity while achieving adaptive optimization.
Data Source
AI summary
A method for setting modes of data transmission, adapted to the base station device provided. The method includes steps of: receiving a signal quality indicator and a value of interference cancellation capability from a terminal device; obtaining a power difference according to the signal quality indicator by subtracting a reception power of the terminal device from a transmission power of the terminal device; comparing the power difference with the value of interference cancellation capability, and setting the terminal device as a first type terminal device only allowed to apply half duplex transmission or a second type terminal device allowed to apply full duplex transmission according to the comparison result.