Full Duplex Link Adaptation via Power Margin Feedback
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Solution Overview
Problem
Full duplex communications systems face challenges in optimizing link adaptation to enhance spectral efficiency and adapt to varying environmental conditions, as existing methods struggle to effectively manage self-interference and power margins in both uplink and downlink transmissions.
Innovation Solution
A system and method for full duplex link adaptation that involves a communications controller and user equipment exchanging measurement reports to adjust configuration parameters based on power margins, allowing for dynamic modulation and coding scheme adjustments and transmit power levels to optimize link performance, enabling efficient operation in both uplink and downlink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full duplex operation is implemented to double spectrum efficiency, then spectral efficiency is improved, but self-interference management complexity increases
Solution Approach 1:
The patent introduces an intermediary measurement report mechanism that mediates between the transmitting and receiving functions. The reporting entity (which can be the FD device itself or a separate entity) provides feedback about power margins and self-interference conditions, enabling the FD device to adapt its transmission parameters without directly managing the complexity of self-interference cancellation. This intermediary feedback loop resolves the contradiction by externalizing the complexity management.
Solution Approach 2:
The patent implements a feedback mechanism where measurement reports containing power margin information are continuously provided to the FD device. This feedback enables dynamic adjustment of transmission parameters based on actual self-interference conditions, allowing the system to maintain high spectral efficiency while managing complexity through adaptive control rather than static complex processing.
2Adaptability or versatility
If dynamic link adaptation is performed to optimize performance in varying environmental conditions, then adaptability is improved, but control complexity increases
Solution Approach 1:
The patent focuses on changing specific parameters (transmission power, modulation scheme, coding rate) based on power margin measurements rather than redesigning the entire control system. By identifying and adjusting key parameters that have the most impact on performance, the system achieves high adaptability to environmental changes while keeping the control mechanism relatively simple and manageable.
Solution Approach 2:
The FD device performs self-adaptation by using its own measurement reports and power margin information to adjust its transmission parameters. This self-service approach reduces the need for complex external control mechanisms, as the device autonomously adapts to environmental conditions based on its own operational state and measurements.
3Reliability
If transmit power is increased to overcome self-interference, then signal quality is improved, but power consumption increases
Solution Approach 1:
The patent applies partial action by adjusting transmit power based on the actual power margin available rather than always using maximum power. The measurement report indicates whether there is sufficient power margin to increase transmission power to overcome self-interference. This selective approach ensures signal quality is maintained only when necessary, avoiding excessive power consumption when the channel conditions or self-interference levels do not require it.
Data Source
AI summary
A method for operating a communications controller adapted for full duplex (FD) operation includes receiving a measurement report from a user equipment served by the communications controller, the measurement report indicating a first power margin between a current transmit power and a transmit power break point and a second power margin between the current transmit power and a maximum transmit power capable of supporting FD operation, performing FD link adaptation (LA) in accordance with the first power margin and the second power margin to adjust one or more FD configuration parameters of a link between the communications controller and the user equipment, wherein the link includes a downlink and an uplink, and instructing the user equipment to communicate over the link in accordance with the one or more FD configuration parameters.