Full-Duplex Self-Interference Mitigation via Joint Node Selection
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Solution Overview
Problem
Existing full-duplex wireless communication systems face challenges in effectively mitigating self-interference, particularly when digital transmit and receive precoding are involved, which affects the accuracy of channel state information (CSI) acquisition.
Innovation Solution
The proposed solution involves joint downlink (DL) node or beam selection, along with user equipment (UE) self-interference emulation, to enable full-duplex (FD) operations. This approach allows the UE to receive from one node while transmitting to another, enhancing cross-link isolation and mitigating self-interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex communication is implemented over the same frequency bandwidth, then spectrum utilization is improved, but self-interference between transmit and receive beams increases
Solution Approach 1:
The patent segments the communication process by separating downlink and uplink channel state information acquisition into distinct phases with different precoding configurations. The network configures separate CSI reporting settings for downlink and uplink, allowing independent optimization of each direction while maintaining full-duplex operation over the same frequency bandwidth.
Solution Approach 2:
The patent changes the precoding parameters dynamically based on the communication direction. Different precoding matrices are applied for downlink CSI acquisition versus uplink CSI acquisition, and the network adjusts these parameters according to the operational mode (half-duplex or full-duplex) to mitigate self-interference while maintaining spectrum efficiency.
2Reliability
If digital transmit and receive precoding are applied at the UE side, then communication performance is improved, but accuracy of channel state information acquisition deteriorates due to self-interference
Solution Approach 1:
The patent implements preliminary action by having the network configure precoding settings and CSI reporting parameters before the actual full-duplex communication begins. The network provides advance configuration information including precoding matrix indicators and CSI reporting settings, allowing the UE to prepare the appropriate precoding configurations that will minimize self-interference impact during subsequent measurements.
Solution Approach 2:
The network acts as an intermediary by configuring and coordinating the precoding settings between the UE's transmit and receive functions. The network provides the configuration information that mediates the interaction between digital precoding and self-interference, ensuring that the precoding parameters are optimized to maintain CSI accuracy while enabling full-duplex operation.
Data Source
AI summary
Some aspects of the present disclosure enable a network to account for impacts of digital transmit and receive precoding at the user equipment (UE) side in the presence of UE self-interference that may occur during full duplex (FD) operation. Some aspects of the present disclosure include joint downlink (DL) node selection or beam selection, or both, and UE self-interference emulation, so that the UE is enabled with FD operation that includes receiving from one node, but transmitting towards another node. When compared with the case where the UE receives from, and transmits, to a same node, because when two separate nodes are involved and the two nodes are more physically separated, the chance of achieving higher cross-link isolation, and hence FD transmission, is higher.