Full Duplex CSI Reporting via Aggressor Signal Measurement
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Solution Overview
Problem
Full duplex wireless communication systems face challenges in maximizing capacity due to interference issues, such as self-interference and co-channel interference, which limit the potential of doubling wireless link capacity compared to traditional duplex schemes.
Innovation Solution
A user equipment (UE) and base station configuration that allows a UE to receive candidate two-dimensional hypotheses for channel state information (CSI) reporting, enabling the determination of preferred hypotheses based on signal measurements from an aggressor UE, and transmitting these to the base station for joint determination of uplink and downlink transport formats, thereby optimizing resource allocation and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full duplex communication is implemented to double wireless link capacity, then system throughput is improved, but interference (self-interference and co-channel interference) increases
Solution Approach 1:
The patent measures the interfering signal from the aggressor UE using reference signals, determines channel state information about the interference, and uses this information to adjust downlink transmissions to the victim UE. By converting the harmful interference into useful channel state information, the system can compensate for and mitigate the interference effects, enabling full duplex operation to achieve its capacity benefits while managing the interference through informed transmission adjustments
Solution Approach 2:
The patent implements a feedback mechanism where the victim UE measures the interfering signal, determines channel state information, and reports this information back to the base station. The base station then uses this feedback to adjust downlink transmission parameters (such as precoding matrices, modulation and coding schemes, or resource allocation) to compensate for the measured interference, creating a closed-loop system that continuously adapts to interference conditions
2Reliability
If interference cancellation techniques are applied to reduce interference, then signal quality is improved, but system complexity increases
Solution Approach 1:
The patent extracts only the essential interference information needed for mitigation by having the victim UE measure specific reference signals from the aggressor UE and report channel state information about the interference. Rather than implementing complex real-time interference cancellation processing, the system extracts and reports only the necessary channel characteristics, which the base station then uses to adjust transmissions. This approach achieves interference mitigation with minimal additional complexity at the UE side
Data Source
AI summary
Aspects of the disclosure relate to a wireless user equipment (UE) configured to receive a downlink in a network configured for full duplex communication. The UE receives from the network an indication of one or more candidate two-dimensional hypotheses for channel state information (CSI) reporting. The UE measures interference of a signal from the aggressor UE, and based on the measurement, determines one or more preferred two-dimensional hypotheses, from the candidate two-dimensional hypotheses. The UE may further determine one or more downlink transmission parameters for a downlink the UE receives, corresponding to the preferred two-dimensional hypotheses. The UE then transmits a CSI report that includes an indication of preferred two-dimensional hypotheses. The CSI report may further include the determined downlink transmission parameters. Other aspects, embodiments, and features are also claimed and described.