Unequal Density DM-RS Configuration 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 frequency or time, which can lead to suboptimal channel estimation accuracy for UEs with varying channel conditions and mobility.
Innovation Solution
The implementation of new parameters for DM-RS configuration, such as dmrs.CDMGroupFrequencyDensity, allows for flexible allocation of DM-RS densities across frequency and time, enabling better resource utilization and channel estimation accuracy based on UE-specific channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If equal density DM-RS configuration is used for all antenna ports, then device complexity is reduced and ease of operation is improved, but channel estimation accuracy deteriorates for UEs with varying channel conditions and mobility
Solution Approach 1:
The patent applies local quality by configuring different DM-RS densities for different antenna ports based on their specific channel conditions. Each antenna port can have its own density parameter (e.g., dmrs.CDMGroupFrequencyDensity set to different values like 2 or 4), allowing the system to optimize channel estimation accuracy for each port individually rather than using a uniform density across all ports.
Solution Approach 2:
The patent implements dynamics by making the DM-RS density configurable and adaptable through RRC signaling. The network can dynamically adjust the density parameters based on UE-specific requirements, channel conditions, and mobility patterns, transitioning from a static equal-density configuration to a dynamic unequal-density configuration that responds to changing conditions.
2Measurement precision
If unequal density DM-RS configuration is implemented for different antenna ports, then channel estimation accuracy is improved for UEs with varying channel conditions, but device complexity and configuration overhead increase
Solution Approach 1:
The patent applies parameter changes by introducing and configuring specific DM-RS density parameters (such as dmrs.CDMGroupFrequencyDensity) that can take different values for different antenna ports. This allows the system to change the density parameter from a fixed value to variable values, optimizing channel estimation for each port while managing complexity through standardized parameter definitions.
Solution Approach 2:
The patent applies segmentation by dividing the DM-RS configuration into separate, independently configurable parameters for each antenna port or CDM group. Instead of a single global density setting, the configuration is segmented into port-specific or group-specific density parameters, allowing granular control while maintaining manageable complexity through modular configuration.
3Adaptability or versatility
If separate DM-RS density groups are configured for uplink and downlink communications, then adaptability to different communication directions is improved, but configuration overhead and complexity increase
Solution Approach 1:
The patent applies universality by creating a reusable DM-RS density configuration framework that can be applied to both uplink and downlink communications. The same parameter structure and configuration mechanisms (RRC signaling, group-based configuration) serve multiple communication directions, reducing the need for entirely separate configuration systems while maintaining direction-specific adaptability.
Data Source
AI summary
A system can receive a message from a base station configured to communicate via a group of antenna ports, the message being indicative of conducting uplink communications of broadband cellular communications with the base station according to a first group of differing demodulation reference signal densities, wherein respective demodulation reference signal densities of the group of differing demodulation reference signal densities correspond to respective antenna ports of the group of antenna ports, and wherein communicating the broadband cellular communications for uplink communications according to the first group of differing demodulation reference signal densities is performed independently of a second group of demodulation reference signal densities that is configured for downlink communications. The system can use the group of differing demodulation reference signal densities to further communicate the broadband cellular communications with the base station.