Full-Duplex Precoding Matrix Switching for Self-Interference Control
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing self-interference and optimizing precoding matrices in half duplex and full duplex modes, leading to inefficiencies in power consumption, spectral efficiency, and reliability.
Innovation Solution
Configuring user equipment (UE) to use different precoding matrices during different portions of a transmission time interval (TTI), specifically a first precoding matrix in half duplex mode and a second precoding matrix in full duplex mode, to reduce self-interference and enhance communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single precoding matrix is used for both half duplex and full duplex modes, then device complexity is reduced, but self-interference increases and spectral efficiency deteriorates in full duplex mode
Solution Approach 1:
The patent applies dynamics by making the precoding matrix configuration adaptive to the operating mode. The system dynamically selects between a first precoding matrix for half duplex mode and a second precoding matrix for full duplex mode, allowing the precoding configuration to change based on real-time operational requirements. This resolves the contradiction by accepting increased configuration complexity in exchange for significantly reduced self-interference and improved spectral efficiency in full duplex mode.
Solution Approach 2:
The patent changes the precoding matrix parameter based on the duplex mode. By using different precoding matrices optimized for specific modes (first matrix for half duplex, second matrix for full duplex), the system optimizes performance for each operating condition. This parameter change approach allows the system to minimize self-interference in full duplex mode while maintaining simplicity in half duplex mode, resolving the technical contradiction between complexity and performance.
2Productivity
If different precoding matrices are used for half duplex and full duplex modes, then spectral efficiency improves, but device complexity and configuration overhead increase
Solution Approach 1:
The patent segments the precoding matrix configuration into mode-specific matrices: a first precoding matrix optimized for half duplex operation and a second precoding matrix optimized for full duplex operation. This segmentation allows each matrix to be independently optimized for its specific mode, improving spectral efficiency in full duplex mode while keeping half duplex operation simple. The segmentation resolves the contradiction by organizing complexity in a structured, mode-specific manner rather than requiring a single complex matrix to handle all scenarios.
Solution Approach 2:
The system changes the precoding matrix parameter based on the detected or indicated duplex mode. When full duplex mode is detected or indicated, the second precoding matrix is applied to optimize spectral efficiency. When half duplex mode is active, the first precoding matrix is used. This parameter change strategy improves productivity in full duplex mode while managing device complexity through mode-based selection rather than continuous optimization.
3Use of energy by moving object
If full duplex mode is used continuously, then power consumption is reduced, but self-interference and reliability decrease
Solution Approach 1:
The patent implements periodic switching between half duplex and full duplex modes based on operational conditions, traffic requirements, and interference levels. Rather than continuously operating in full duplex mode to minimize power consumption, the system periodically evaluates whether to switch modes. This periodic action allows the system to maintain full duplex operation during favorable conditions (reducing power consumption) while switching to half duplex mode during unfavorable conditions (maintaining reliability), thus resolving the contradiction between energy efficiency and reliability.
Solution Approach 2:
The system uses feedback mechanisms to monitor communication quality, interference levels, and operational conditions. Based on this feedback, the system dynamically determines whether to operate in full duplex or half duplex mode. When feedback indicates high self-interference or poor channel conditions, the system switches to half duplex mode to maintain reliability. When conditions are favorable, full duplex mode is used to reduce power consumption. This feedback-driven approach resolves the contradiction by continuously adapting to maintain both energy efficiency and reliability.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A communication device, otherwise known as a user equipment (UE) may support use of separate precoding matrices, among other parameters, while the UE is operating in a half duplex mode or a full duplex mode, or a combination thereof. For example, the UE may determine a first precoding matrix associated with wireless communication (e.g., downlink, uplink) when in a half duplex mode during a first portion of a transmission time interval (TTI), and determine a second precoding matrix to use for the wireless communication when in a full duplex mode during a second portion of the TTI. The second precoding matrix may be different from the first precoding. The UE may, as a result, perform the wireless communication based on the second precoding matrix when in the full duplex mode during the second portion of the TTI.