DMRS Resource Element Configuration for Channel Estimation Capacity Tradeoffs
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently configuring resource elements (REs) in demodulation reference signals (DMRS) for data transmission, particularly in 5G NR networks, leading to inefficiencies in channel estimation and reduced system capacity.
Innovation Solution
The system configures REs in DMRS by dynamically indicating whether certain sets of DMRS symbols are used for data transmission or not, utilizing code division multiplexing (CDM) groups, and introducing new DMRS patterns to reduce overhead and increase system capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional DMRS configurations are used, then channel estimation can be performed, but DMRS overhead is high and system capacity is reduced
Solution Approach 1:
The patent divides the DMRS configuration into multiple sets of resource elements, where each set can be independently configured for different purposes (channel estimation or data transmission). This segmentation allows the system to reduce overall DMRS overhead while maintaining sufficient channel estimation capability by selectively configuring only the necessary sets, thereby increasing system capacity.
Solution Approach 2:
The patent introduces dynamic indication mechanisms through Downlink Control Information (DCI) that allow the gNodeB to dynamically configure which DMRS sets should be used for channel estimation and which can be used for data transmission. This dynamic configuration enables the system to adapt to different channel conditions and traffic requirements, optimizing the balance between channel estimation reliability and system capacity.
2Measurement precision
If more resource elements are allocated for DMRS, then channel estimation accuracy improves, but available resources for data transmission decrease
Solution Approach 1:
The patent applies different configurations to different sets of resource elements based on their specific requirements. Some sets are configured with higher DMRS density for accurate channel estimation in challenging channel conditions, while other sets use minimal or no DMRS when channel conditions are favorable, maximizing the available REs for data transmission.
Solution Approach 2:
The patent enables flexible parameter configuration for DMRS sets, including the number of front-loaded DMRS symbols, the mapping of DMRS ports to CDM groups, and the indication of which sets should be used for data transmission. These parameter changes allow optimization of the balance between channel estimation accuracy and data transmission capacity based on actual system needs.
3Device complexity
If DMRS patterns are simplified, then system complexity reduces, but compatibility with legacy and new UEs becomes challenging
Solution Approach 1:
The patent designs a universal DMRS configuration framework that can serve both legacy and new UEs. The gNodeB can dynamically indicate which DMRS sets should be used, allowing new UEs to benefit from reduced overhead while legacy UEs continue to operate with traditional configurations. The common DCI signaling mechanism provides a universal interface for configuring DMRS sets that works across different UE types.
Solution Approach 2:
The patent employs feedback mechanisms where the gNodeB receives UE capability information and uses this feedback to determine the appropriate DMRS configuration. The DCI signaling includes indication fields that provide feedback about which sets should be used for channel estimation versus data transmission, enabling the system to adapt to different UE types while maintaining compatibility.
Data Source
AI summary
Presented are systems, methods, apparatuses, or computer-readable media for configuring resource elements (REs) in demodulation reference signals (DMRSs) for data transmission. A wireless communication device may receive, from a wireless communication node, a first signaling indicating whether at least one set of a plurality of sets of resource elements of at least one demodulation reference signal (DMRS) symbol, is to be used for transmission that excludes DMRS. Each of the plurality of sets may include at least one code division multiplex (CDM) group, each of the at least one CDM group including resource elements on which corresponding DMRS ports are multiplexed.