DMRS Resource Determination and Indication for LTE-Advanced
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication technologies, such as LTE/LTE-Advanced, lack standardized methods for generating and mapping DMRS resources across various configurations and waveforms, leading to inefficiencies in DMRS transmission.
Innovation Solution
A method and apparatus for determining and indicating DMRS resources, including the use of a DMRS mapping table that combines domain resources in predefined priority orders, and indicating the number of symbols and subcarriers for carrying DMRS resources in time and frequency domains, respectively, using RRC signaling or DCI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple DMRS configurations and waveforms are supported, then system versatility is improved, but resource generation and mapping complexity increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting DMRS configuration parameters (such as resource allocation, mapping patterns, and generation methods) based on the selected waveform type and transmission scenario. This allows the system to adapt to different waveforms (CP-OFDM, DFT-S-OFDM) and configurations without requiring separate complex processing for each case, thereby resolving the contradiction between versatility and complexity.
2Quantity of substance
If DMRS resources are allocated for multiple antenna ports and layers, then system capacity is improved, but resource allocation complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the DMRS resource allocation into distinct segments for different antenna ports and layers. Each port and layer is assigned specific DMRS resources through structured port mapping rules and layer-to-port associations. This segmented approach enables the system to support multiple antenna ports and layers simultaneously while managing allocation complexity through organized, modular resource assignment.
3Reliability
If standardized DMRS resource generation methods are implemented, then system reliability is improved, but flexibility in handling various configurations decreases
Solution Approach 1:
The patent applies universality by designing a standardized DMRS resource generation and mapping framework that can universally handle multiple waveform types (CP-OFDM, DFT-S-OFDM), different transmission scenarios (downlink, uplink), and various antenna port configurations. The standardized methods use configurable parameters and mapping rules that adapt to different scenarios, ensuring reliable and consistent DMRS transmission across diverse configurations without requiring separate standardized procedures for each case.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present disclosure is related to a method and apparatus for DMRS transmission. According an embodiment of the disclosure, a method including determining at least one antenna port for a user equipment (UE); determining a demodulation reference signal (DMRS) resource for each of the at least one antenna port respectively; determining the number of symbols for carrying the determined DMRS resource in time domain； and indicating the determined DMRS resource of each of the at least one antenna port to the UE. Embodiments of the disclosure solve the technical problem of indicating DMRS resource and determining symbol/subcarriers for carrying the DMRS resource during DMRS transmission.