Full-Duplex Self-Interference Measurement and MCS Adjustment
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Solution Overview
Problem
In wireless communications, full-duplex devices experience self-interference that current technologies fail to adequately account for, leading to decreased efficiency in decoding transmissions and overall communication effectiveness.
Innovation Solution
A method where a first wireless device transmits a reference signal to a second device, which measures self-interference and provides channel state information and an interference report, allowing the first device to adjust its modulation and coding scheme (MCS) and rank to compensate for self-interference, thereby improving communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex communications are implemented to enable simultaneous transmission and reception, then communication efficiency and spectrum utilization are improved, but self-interference occurs that degrades signal quality and decoding success rate
Solution Approach 1:
The patent implements a feedback mechanism where the receiving device measures self-interference on measurement resources and reports this information back to the transmitting device. The transmitting device then uses this feedback to adjust transmission parameters (MCS, rank) to compensate for the measured self-interference, thereby maintaining communication efficiency while mitigating the harmful effects of self-interference in full-duplex operations
Solution Approach 2:
The patent dynamically changes transmission parameters (modulation and coding scheme, rank) based on measured self-interference levels. When self-interference is detected on measurement resources, the system adjusts these parameters to adapt to the degraded channel conditions, allowing full-duplex communication to maintain reliability despite the presence of self-interference
2Reliability
If self-interference measurement and reporting mechanisms are added to full-duplex systems, then decoding success rate is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent performs self-interference measurement in advance on dedicated measurement resources before actual data transmission. By measuring self-interference beforehand and reporting this information, the system can pre-adjust transmission parameters to account for expected interference conditions, improving decoding success rate while containing complexity through structured measurement and reporting procedures
3Reliability
If transmission parameters are dynamically adjusted based on self-interference measurements, then communication reliability is improved, but processing overhead and latency increase
Solution Approach 1:
The patent performs self-interference measurement and parameter adjustment in advance using measurement resources allocated before data transmission. By completing the measurement and adjustment process beforehand, the system minimizes the time loss during actual communication, maintaining high reliability while reducing latency compared to real-time adjustment approaches
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. For instance, a first device may transmit a reference signal to a second device and the second device may measure self-interference at the second device. In a first example, the second device may transmit an indication of channel state information to the first device along with an interference report including a measure of the self-interference, which the first device may use to determine an MCS and/or a rank. In a second example, the second device may determine an MCS and/or rank based on measuring the self-interference. In some examples, the second device may transmit a first indication of the MCS and/or rank determined based on measuring the self-interference to the first device along with a second indication that the MCS and/or rank is associated with full-duplex communications at the second device.