Full-Duplex Resource Power Scaling for Self-Interference Mitigation
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Solution Overview
Problem
Full-duplex wireless communications systems face challenges with self-interference due to concurrent transmission and reception, impacting reception quality and reliability.
Innovation Solution
Mitigation of self-interference through reduced transmission power on overlapping wireless resources, with the base station indicating power reduction to receiving devices, allowing successful decoding and combining of transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex transmission is implemented to enable concurrent transmission and reception, then system throughput is improved, but self-interference increases and reception reliability deteriorates
Solution Approach 1:
The base station applies different transmission power levels to different wireless resources (time slots, frequency subcarriers, or resource blocks) based on whether they are subject to self-interference. Specifically, resources that experience self-interference during full-duplex operation are transmitted at reduced power, while non-interfered resources maintain nominal power, thereby locally optimizing reception quality where needed while preserving overall system throughput
Solution Approach 2:
The system dynamically adjusts the transmission power parameter for specific wireless resources based on the full-duplex interference condition. When a resource is identified as being subject to self-interference, the transmission power parameter is changed from nominal level to a reduced level, enabling the receiver to successfully decode the transmission despite the interference environment
2Reliability
If transmission power is reduced on overlapping resources to mitigate self-interference, then reception quality is improved, but transmission power efficiency deteriorates
Solution Approach 1:
Rather than reducing transmission power across all resources, the system applies power reduction only to specific wireless resources that are subject to self-interference during full-duplex operation. This localized approach ensures reception quality is maintained for interfered resources while avoiding unnecessary power reduction on non-interfered resources, thereby preserving transmission power efficiency
Solution Approach 2:
The system applies partial power reduction only to the extent necessary to mitigate self-interference on affected resources, rather than applying full power reduction across the entire transmission. This partial action approach is sufficient to ensure successful decoding on interfered resources while minimizing the impact on overall power efficiency
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described in which a base station operating in full-duplex mode may provide for reception of one or more higher priority transmissions using at least partially overlapping time-frequency resources as used for transmission of lower priority communications. In order to mitigate self-interference at the base station, a transmission power used for the overlapping time-frequency resources may be reduced. The base station may provide an indication of a subset of resources that have a reduced transmission power, an amount of the power reduction for the subset of resources, or both.