DM-RS Port Association for Interference Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing communication technologies face inefficiencies in interference suppression due to mismatched interference characteristics between resource elements (REs) and demodulation reference symbols (DM-RS) ports in multiplexed physical resource blocks (PRBs), leading to inaccurate interference covariance estimation and suboptimal performance in E-PDCCH and PDSCH transmissions.
Innovation Solution
Associating one or more DM-RS ports with a subset of REs that have similar interference characteristics, allowing for accurate interference estimation and enhanced interference suppression by ensuring the interference experienced by DM-RS ports reflects that of the data and control information REs, thereby improving decoding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple E-PDCCHs or PDSCHs are multiplexed within one PRB pair using FDM, then resource utilization efficiency is improved, but interference covariance estimation accuracy deteriorates due to mismatched interference characteristics between DM-RS ports and data/control REs
Solution Approach 1:
The patent applies local quality by associating each DM-RS port with a specific subset of resource elements that have similar interference characteristics. Instead of using a uniform association across the entire PRB pair, the system creates localized associations where DM-RS ports are mapped to specific E-PDCCH or PDSCH regions. This ensures that interference estimation is performed locally with matching interference characteristics, resolving the contradiction between multiplexing efficiency and estimation accuracy.
2Area of stationary object
If one DM-RS port is mapped to each part of the PRB pair, then reference signal coverage is improved, but interference suppression performance deteriorates due to different interference conditions across PRB parts
Solution Approach 1:
The patent implements local quality by creating specific associations between DM-RS ports and resource element subsets. Each association is tailored to match interference characteristics, so that DM-RS ports in regions with similar interference are grouped together. This resolves the contradiction by ensuring both comprehensive coverage and matched interference characteristics for accurate suppression.
Solution Approach 2:
The patent applies segmentation by dividing the PRB pair into multiple subsets of resource elements, each associated with specific DM-RS ports. This segmentation allows the system to handle different interference conditions in different regions separately, improving overall interference suppression performance while maintaining full coverage through the distributed DM-RS port associations.
3Device complexity
If interference covariance matrix is estimated by averaging sample estimates at RS locations, then estimation process is simplified, but accuracy deteriorates when RS locations experience different interference than data REs
Solution Approach 1:
The patent resolves this contradiction by ensuring that the local quality of interference characteristics is matched between DM-RS ports and their associated resource elements. The simplified averaging process remains valid because the association rule guarantees that averaged samples are taken from locations with similar interference conditions, making the simple estimation method accurate without requiring complex adjustments.
Data Source
AI summary
A method is provided that includes allocating a first subset of resource elements (REs) of a physical resource block (PRB) to a mobile terminal and associating one or more first demodulation reference symbols (DM-RS) ports therewith. The first subset of REs and the one or more first DM-RS ports have common interference characteristics, thereby providing for enhanced interference suppression. The method also includes causing transmission of the PRB for reception by the mobile terminal. Corresponding apparatus and computer program products are also provided.