Full-Duplex Channel Quality Reporting via Effective SINR
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Solution Overview
Problem
Full-duplex wireless communication systems face challenges in accurately reporting channel quality due to self-interference, which affects the selection of optimal modulation and coding schemes, leading to inefficient spectrum utilization.
Innovation Solution
An apparatus and method that determine the effective signal-to-interference-plus-noise ratio (SINR) by considering both measured SINR and self-interference cancellation (SIC) levels, allowing for the selection of appropriate modulation and coding schemes to enhance spectral efficiency in full-duplex communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex radio transmission and reception are performed simultaneously using the same frequency resources, then spectrum utilization is improved, but self-interference occurs that degrades signal detection accuracy
Solution Approach 1:
The patent measures the self-interference signal during full-duplex operation and uses this harmful signal to calculate an effective SINR that accounts for the interference. By converting the harmful self-interference into useful measurement data, the system can accurately determine channel quality indicators despite the presence of interference, thereby maintaining high spectrum utilization while compensating for the degradation caused by self-interference
2Device complexity
If traditional channel quality reporting techniques are used in full-duplex systems, then device complexity is reduced, but channel quality measurement accuracy deteriorates due to self-interference
Solution Approach 1:
The patent introduces a new parameter - effective SINR - that differs from traditional SINR measurements by incorporating self-interference cancellation levels. This parameter change allows the system to accurately reflect channel quality in full-duplex conditions without requiring completely new measurement methodologies, thus improving accuracy while maintaining reasonable complexity
3Measurement precision
If self-interference cancellation is implemented in full-duplex radio, then signal detection accuracy is improved, but device complexity increases due to additional cancellation circuitry
Solution Approach 1:
The patent implements a feedback mechanism where the measured self-interference signal is used to calculate cancellation levels, which are then fed back into the effective SINR calculation. This feedback loop enables the system to dynamically adjust channel quality measurements based on actual interference conditions, improving signal detection accuracy while using the existing cancellation circuitry efficiently
Data Source
AI summary
Techniques are disclosed relating to channel quality reporting for full-duplex (FD) wireless communications. In some embodiments an apparatus (e.g., a mobile device) is configured to receive a reference signal in a wireless communication and determine one or more signal quality indicators for FD communications based on a measured SINR of the reference signal and one or more self-interference cancelation levels. The apparatus may determine the one or more self-interference cancelation levels based on the transmit power of signals transmitted by the apparatus and residual power after SIC. The SIC levels may include both analog and digital SIC levels, which may be separately determined. One or more modulation and coding schemes may be determined based on the effective SINR. In some embodiments, multiple effective SINRs are determined for multiple different transmission modulation orders used by the apparatus.