Full-Duplex Feedback Control for UE Self-Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In full-duplex wireless communication systems, UEs experience self-interference due to simultaneous uplink and downlink transmissions, leading to unsuccessful decoding of downlink transmissions, which current systems fail to recognize as self-interference, resulting in unnecessary adjustments and continued reception failures.
Innovation Solution
UEs generate feedback on self-interference, transmitting a report to the base station indicating decoding failures, allowing the base station to adapt configurations to mitigate self-interference, such as adjusting uplink power, beam pairs, and modulation schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex mode is used for simultaneous uplink and downlink transmissions, then communication efficiency is improved, but self-interference occurs causing decoding failures
Solution Approach 1:
The patent implements a feedback mechanism where the UE reports self-interference conditions to the base station by embedding self-interference indicators in UCI messages. This feedback enables the base station to adjust transmission parameters dynamically, resolving the contradiction by allowing full-duplex operation while mitigating its harmful effects through continuous monitoring and adaptation.
Solution Approach 2:
The system dynamically changes transmission parameters including uplink power, beam pairs, and modulation schemes based on reported self-interference conditions. By adjusting these parameters in response to real-time feedback, the system maintains full-duplex productivity while adapting to varying interference levels to preserve decoding reliability.
2Reliability
If self-interference feedback is implemented, then decoding reliability is improved, but system complexity increases
Solution Approach 1:
The patent reuses existing uplink control information (UCI) channels and message structures to carry self-interference feedback, rather than creating dedicated new signaling channels. This multi-functional approach allows the same control infrastructure to serve both traditional control functions and the new self-interference reporting function, improving reliability without proportionally increasing system complexity.
3Reliability
If base station adjusts transmission parameters frequently, then communication reliability is improved, but latency increases
Solution Approach 1:
The system prepares multiple pre-configured transmission parameter sets at the base station before they are needed. When self-interference feedback is received, the base station can immediately switch to a pre-prepared parameter set rather than calculating new parameters in real-time. This preliminary preparation reduces the time required for parameter adjustments while maintaining communication reliability.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. The described techniques provide for improving negative acknowledgment (NACK) feedback from a user equipment (UE) to limit self-interference during full-duplex communications with a base station. After failing to receive a downlink transmission from a base station, a UE may generate feedback associated with self-interference at the UE to transmit to the base station. The UE may then transmit a report to the base station indicating that the UE failed to successfully decode the downlink transmission, and the UE may include the feedback associated with self-interference at the UE in the report. The base station may receive the report and adapt configurations used for full-duplex communications with the UE based on the feedback to limit self-interference at the UE during full-duplex communications.