Unequal Density DM-RS Positions for 5G Uplink Channel Estimation
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Solution Overview
Problem
Existing 5G NR specifications lack flexibility in choosing unequal density demodulation reference signal (DM-RS) ports across time or frequency, which can lead to suboptimal channel estimation accuracy for user equipment (UE) experiencing different channel conditions.
Innovation Solution
The system introduces new parameters for DM-RS configuration, allowing for unequal density DM-RS positions across frequency and time, enabling flexible resource allocation based on UE channel state information and mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If equal density DM-RS positions are used for all antenna ports, then the system configuration is simple and standardized, but channel estimation accuracy deteriorates for UEs experiencing different channel conditions
Solution Approach 1:
The patent applies local quality by allowing different DM-RS densities for different antenna ports based on their specific channel conditions. Each antenna port can be configured with unequal density DM-RS positions tailored to its propagation environment, enabling optimized channel estimation for each local condition rather than a uniform approach.
Solution Approach 2:
The patent introduces dynamic configuration capabilities through new parameters (dmrs.CDMGroupFrequencyDensity, dmrs.DMRSAdditionalPosition) that allow the DM-RS density to be adjusted based on UE channel state information and mobility. This dynamic adaptation enables the system to optimize channel estimation accuracy in response to changing channel conditions.
2Measurement precision
If higher DM-RS density is used for all antenna ports, then channel estimation accuracy improves, but resource utilization deteriorates
Solution Approach 1:
Instead of uniformly increasing DM-RS density for all antenna ports, the patent applies local quality by selectively densifying only those antenna ports that require it based on their specific channel conditions. This localized approach maintains channel estimation accuracy where needed while preserving resource efficiency in favorable conditions.
Solution Approach 2:
The patent changes the density parameter of DM-RS positions dynamically based on channel conditions. By adjusting the DM-RS density parameter selectively for different antenna ports and communication scenarios, the system optimizes the trade-off between channel estimation accuracy and resource utilization.
3Adaptability or versatility
If unequal density DM-RS positions are implemented, then channel estimation accuracy improves for diverse channel conditions, but specification complexity increases
Solution Approach 1:
The patent introduces new configurable parameters (dmrs.CDMGroupFrequencyDensity, dmrs.DMRSAdditionalPosition) that enable unequal density DM-RS positions. These parameter changes allow the system to adapt to diverse channel conditions while maintaining a structured configuration approach through standardized parameter definitions.
Solution Approach 2:
The patent enables dynamic configuration of DM-RS densities based on UE channel state information and mobility conditions. This dynamic capability allows the system to adapt to varying propagation environments while using standardized configuration mechanisms that manage specification complexity.
Data Source
AI summary
A system can determine to communicate first broadband cellular communications with a user equipment, wherein the first broadband cellular communications are configured to be communicated via a group of antenna ports, wherein the first broadband cellular communications are for uplink communications according to a first group of differing demodulation reference signal (DM-RS) densities, wherein respective DM-RS densities correspond to respective antenna ports of the group of antenna ports, and wherein communicating the first broadband cellular communications for uplink communications according to the first group of differing DM-RS densities is performed independently of a second group of DM-RS densities that is configured for downlink communications. The system can communicate the first group of differing DM-RS densities for the uplink communications to the user equipment. The system can use the first group of differing DM-RS densities to further communicate the first broadband cellular communications with the user equipment.