Subband PMI Compression for Distinct Frequency Full Duplex
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Solution Overview
Problem
Full duplex wireless communication systems face issues with self-interference and cross-link interference due to simultaneous transmission and reception, which degrade performance and require efficient channel state information reporting.
Innovation Solution
Implementing precoding matrix indicators (PMIs) for distinct frequency full duplex (DFFD) communication, utilizing frequency domain compression based on correspondence between downlink subbands and CSI subbands to optimize channel state information overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full duplex mode is implemented to improve spectrum efficiency and capacity, then communication efficiency is improved, but self-interference and cross-link interference increase
Solution Approach 1:
The patent segments the frequency spectrum into distinct downlink and uplink subbands that do not overlap, creating separate frequency regions for transmission and reception. This segmentation allows full duplex operation while preventing self-interference by ensuring that the transmitted downlink signal does not interfere with the received uplink signal at the same frequency resources.
Solution Approach 2:
The patent applies different precoding strategies and interference mitigation techniques tailored to specific subbands. By optimizing the transmission characteristics locally for each subband based on channel state information, the system can maximize communication efficiency in each frequency region while minimizing interference effects in overlapping or adjacent regions.
2Reliability
If channel state information reporting is enhanced to improve full duplex performance, then communication quality is improved, but CSI overhead increases
Solution Approach 1:
The patent extracts and reports only the essential channel state information parameters needed for full duplex operation, specifically focusing on precoding matrix indicators (PMIs) for each subband. By selecting and reporting only the most critical CSI parameters rather than complete channel matrices, the system achieves improved communication quality through better precoding while reducing the overhead burden on the uplink control channel.
Solution Approach 2:
The patent implements partial CSI reporting by providing subband-level PMIs rather than full-bandwide CSI or extremely fine-grained subband information. This partial action approach delivers sufficient channel state information to enable effective interference mitigation and precoding for full duplex operation, while avoiding the excessive overhead that would result from reporting complete channel matrices or overly detailed subband information for every resource element.
Data Source
AI summary
This disclosure discloses systems, methods, and devices for wireless communication that support distinct frequency full duplex (DFFD) subband based basis precoding matrix indicators (PMIs) comprising frequency domain compression based at least in part on a correspondence between downlink subbands for a DFFD wireless signal and channel state indicator (CSI) subbands of a CSI subband configuration for the DFFD wireless signal communication. A number of subbands for PMI calculation may be determined based at least in part on CSI subbands having overlap with respect to one or more downlink subbands and frequency domain compression basis determined based at least in part on the determined number of subbands for PMI. Frequency domain basis computation and/or PMI reporting may be provided together or separately with respect to each downlink subband for DFFD wireless signal communication. Other aspects and features are also claimed and described.