DM-RS Resource Element Mapping for Multi-Layer NR Transmission
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Solution Overview
Problem
The existing 3GPP NR system lacks a defined method for configuring a pattern for Demodulation Reference Signals (DMRS) that supports an increased number of layers and antenna ports, particularly in various operation modes, which is essential for meeting the requirements of 5G communication standards like IMT for 2020 and beyond.
Innovation Solution
The proposed solution involves determining a set of antenna ports for DMRS transmission, generating DMRS using orthogonal cover codes, and mapping it to specific resource elements, allowing for dynamic signaling of DMRS configuration information to support multiple layers and antenna ports, enabling efficient DMRS transmission and reception in the NR system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of layers and antenna ports is increased to support advanced communication scenarios, then the system capacity and service requirements (eMBB, mMTC, URLLC) are improved, but the complexity of DMRS pattern configuration and signaling methods increases
Solution Approach 1:
The patent segments the DMRS configuration into multiple components: antenna port sets, orthogonal cover codes (OCC), and resource element mappings. This segmentation allows the complex configuration to be broken down into manageable parts that can be independently configured and signaled, reducing the overall complexity while supporting increased layers and antenna ports
Solution Approach 2:
The patent introduces dynamic signaling mechanisms where the DMRS pattern configuration can be adapted based on the number of layers and antenna ports being used. The system can dynamically select from predefined configurations and adjust the OCC and resource element mapping according to the specific communication scenario, enabling flexible support for various service requirements
2Adaptability or versatility
If dynamic signaling of DMRS pattern configuration is implemented to support various operation modes, then the adaptability to different service requirements is improved, but the signaling overhead and processing complexity increase
Solution Approach 1:
The patent designs a universal DMRS configuration framework that can serve multiple operation modes (eMBB, mMTC, URLLC) and various numbers of layers and antenna ports through a single set of configuration methods. The same basic principles of antenna port set determination, OCC generation, and resource element mapping apply across different scenarios, reducing the need for separate signaling for each mode
Solution Approach 2:
The patent utilizes parameter changes in the orthogonal cover codes and resource element mappings to adapt the DMRS configuration to different operation modes. By varying parameters such as the OCC sequence and the mapping pattern based on the number of layers and antenna ports, the system achieves adaptability without requiring fundamentally different signaling mechanisms for each scenario
Data Source
AI summary
Methods, apparatuses, and systems described herein generally relate to a reference signal generation and mapping. For example, a method comprises determining a first set of antenna ports for a demodulation reference signal (DM-RS) transmission; determining, based on the first set, a frequency index associated with four adjacent resource elements, wherein the four adjacent resource elements correspond to two adjacent symbols in a time axis and to two adjacent subcarriers in a frequency axis; generating, based on a first orthogonal cover code and a second orthogonal cover code, a DM-RS associated with the first set of antenna ports; and transmitting, via a mapping to the four adjacent resource elements, the DM-RS associated with the first set of antenna ports.