TPMI Selection for Full-Duplex Interference Reduction
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Solution Overview
Problem
Existing wireless communication systems face challenges in reducing interference for downlink transmissions due to concurrent uplink transmissions in full-duplex communications, where the base station transmits and receives signals simultaneously.
Innovation Solution
A method where a base station determines a transmit precoding matrix indicator (TPMI) for uplink transmissions based on feedback from a first device, by identifying a candidate subset of TPMIs for a second device and selecting a preferable subset based on interference metrics measured by the first device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex communications are implemented to double link capacity, then productivity is improved, but interference between downlink and uplink transmissions increases
Solution Approach 1:
The patent applies local quality by differentiating the treatment of downlink and uplink transmissions through separate precoding matrix selection. The base station selects different precoding matrices for downlink transmissions to first UEs versus uplink transmissions from second UEs, allowing localized optimization of signal quality for each transmission direction while operating in full-duplex mode.
Solution Approach 2:
The patent changes the parameter of precoding matrix selection based on transmission direction and UE pairing. The base station determines TPMIs (Transmit Precoding Matrix Indicators) differently for downlink versus uplink transmissions, adjusting the precoding parameters to minimize interference while maintaining full-duplex operation and doubled link capacity.
2Productivity
If multiple UEs are supported simultaneously to increase system capacity, then productivity is improved, but device complexity increases
Solution Approach 1:
The patent segments the UE population into first UEs (downlink receivers) and second UEs (uplink transmitters), and applies separate precoding matrix selection processes for each group. This segmentation allows the base station to manage multiple UEs systematically by handling them in distinct categories with dedicated processing logic.
Solution Approach 2:
The patent employs feedback mechanisms where UEs provide channel state information and interference measurements to the base station. This feedback enables the base station to dynamically adjust precoding matrix selections for multiple UEs, reducing the complexity of manual configuration and enabling automated optimization of system capacity.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described for enabling a network equipment to reduce interference for downlink (DL) transmissions to a first device by determining a transmit precoding matrix indicator (TPMI) for uplink (UL) transmissions transmitted by a second device based on feedback from the first device. The first device may determine a subset of possible TPMIs that the second device may use for UL transmissions for full-duplex communications. The first device may indicate the subset to the network equipment. Based on the subset indicated by the first device, the network equipment may determine a pairing of the first device and the second device for full-duplex communications. Additionally, the network equipment may determine a TPMI for the second device to use in UL transmissions and indicate the TPMI to the second device.