FDR Mode Self-Interference Mitigation via DMRS Puncturing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, full duplex multiplexing radio (FDR) mode faces performance deterioration due to self-interference issues, particularly when demodulation reference signal (DMRS) and data resources overlap, affecting signal transmission and reception between user equipment (UE) and base stations.
Innovation Solution
The method involves allocating DMRS and data resources non-overlappingly in FDR mode, with UE and base stations performing self-interference channel estimation and cancellation using punctured resources, and determining operation modes based on resource allocation indication information to prevent performance deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If DMRS and data resources are allocated overlappingly in FDR mode, then resource utilization is improved, but self-interference increases causing performance deterioration
Solution Approach 1:
The patent segments the time-frequency resources by introducing a puncturing mechanism that divides the overlapping DMRS and data resources into separate non-overlapping regions. The UE identifies punctured resource locations where DMRS and data would otherwise overlap, and excludes these locations from data transmission, thereby separating the reference signal resources from data resources to eliminate self-interference while maintaining resource utilization in non-punctured regions.
2Object-affected harmful factors
If puncturing is applied to separate DMRS and data resources, then self-interference is mitigated, but resource utilization decreases
Solution Approach 1:
The patent changes the resource allocation parameters dynamically by using puncturing patterns that are indicated through downlink control information (DCI). The network can adjust the puncturing pattern parameters to adapt to different channel conditions and traffic requirements, optimizing the balance between self-interference mitigation and resource utilization. This allows flexible adjustment of which resource locations are punctured versus utilized for data transmission.
Data Source
AI summary
A method of operating a user equipment (UE) in a wireless communication system is provided. The method includes obtaining resource allocation indication information from a base station through a control channel, determining a UE operation mode based on the resource allocation indication information, transmitting an uplink signal by allocating physical uplink shared channel (PUSCH) resource based on a physical downlink shared channel (PDSCH) demodulation reference signal (DMRS) received from the base station, when the UE operation mode is a full duplex multiplexing radio (FDR) mode, performing self-interference channel estimation based on a PUSCH DMRS resource location, and performing reception channel estimation based on the PDSCH DMRS and demodulating data.