5G NR DMRS Configuration for Flexible PDSCH Symbol Positioning
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Solution Overview
Problem
The challenge in 5G communication systems is effectively configuring demodulation reference signal (DMRS) information to ensure optimal system performance, particularly in the new radio (NR) system where DMRS patterns are flexible and require precise positioning and number settings.
Innovation Solution
A method for configuring DMRS information involves receiving and transmitting configuration details through higher layer signaling, downlink control information, and identifying DMRS positions based on these signals to ensure accurate DMRS reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If DMRS configuration is made flexible with multiple patterns and positions in 5G NR system, then adaptability and system performance are improved, but device complexity and configuration difficulty increase
Solution Approach 1:
The patent implements dynamic DMRS configuration where the base station can flexibly adjust DMRS patterns, positions, and densities based on real-time channel conditions and traffic requirements. The system supports multiple DMRS configurations that can be dynamically selected and switched, allowing the DMRS structure to adapt to varying transmission scenarios while maintaining manageable complexity through standardized configuration mechanisms.
Solution Approach 2:
The patent employs parameter-based configuration where DMRS characteristics such as position, density, and pattern are controlled through configurable parameters signaled to the UE. By changing these parameters dynamically, the system achieves flexible DMRS adaptation without requiring complex structural modifications, simplifying the overall configuration process while maintaining versatility.
2Measurement precision
If precise DMRS positioning and number settings are implemented, then measurement precision and demodulation accuracy are improved, but signaling overhead and configuration complexity increase
Solution Approach 1:
The patent utilizes Downlink Control Information (DCI) messages that serve multiple functions: they not only indicate DMRS configuration parameters but also carry scheduling information and other control data. This multi-functionality allows precise DMRS positioning and number settings to be communicated efficiently without significantly increasing overall signaling overhead, as the DMRS configuration information is embedded within existing universal control structures.
Solution Approach 2:
The patent implements preliminary configuration of DMRS parameters through higher-layer signaling (RRC configuration) before actual data transmission. This preliminary action establishes the DMRS configuration framework in advance, allowing precise positioning and number settings to be predetermined and stored, thereby reducing the need for frequent detailed signaling during actual transmission and minimizing real-time signaling overhead.
3Reliability
If multiple additional DMRS symbols are configured based on scheduled PDSCH duration, then reliability and channel estimation accuracy are improved, but device complexity and processing requirements increase
Solution Approach 1:
The patent implements dynamic determination of additional DMRS symbols based on the scheduled PDSCH duration. The UE processes configuration information that specifies the number of additional DMRS symbols according to the actual PDSCH length, allowing the DMRS structure to adapt dynamically to different transmission scenarios. This dynamic approach improves channel estimation reliability for longer transmissions while maintaining manageable UE processing complexity through standardized determination rules.
4Adaptability or versatility
If flexible DMRS patterns are supported with configurable positions and numbers, then system adaptability is improved, but difficulty of detecting and measuring DMRS parameters increases
Solution Approach 1:
The patent implements feedback mechanisms where the UE detects and measures DMRS parameters based on configured information and provides implicit feedback through successful demodulation and acknowledgment. The base station uses this feedback to verify correct DMRS configuration and adjust parameters if needed. This feedback loop simplifies the detection and measurement process by providing clear reference points and validation mechanisms, reducing the difficulty of parameter detection while maintaining flexible DMRS patterns.
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th generation (5G) communication system with a technology for Internet of Things (IoT) to support higher data rates beyond a 4th generation (4G) system. A method of a UE is provided. The method includes receiving, from a base station, configuration information including first information on a number of an additional demodulation reference signal (DMRS) symbol by higher layer signaling, receiving, from the base station, downlink control information (DCI) including second information on a time domain resource, identifying third information on a duration in symbols of a scheduled physical downlink shared channel (PDSCH) resource based on the second information, identifying a position of a DMRS symbol based on the first information and the third information, and receiving, from the base station, at least one DMRS based on the position of the DMRS symbol.