DMRS Layer Configuration for M-PAM Constellations
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Solution Overview
Problem
Current wireless communication systems, such as 3GPP New Radio (NR), lack suitable constellations for modulation, limiting spectral efficiency and flexibility in resource allocation.
Innovation Solution
The method involves transmitting control signalling from a network node to a wireless device indicating the layer configuration associated with an upcoming demodulation reference signal (DMRS), allowing the device to differentiate between data and interference layers, and enabling the use of M-PAM constellations for improved spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional complex-valued constellations are used in NR, then the system maintains compatibility with existing standards, but spectral efficiency and flexibility in resource allocation are limited
Solution Approach 1:
The patent segments the complex-valued modulation constellation into separate real and imaginary components, each treated as independent layers. This allows independent configuration and allocation of resources to each layer, enhancing flexibility while maintaining compatibility with existing NR infrastructure that expects complex-valued signals.
Solution Approach 2:
The patent introduces a new dimension of configuration by treating real and imaginary parts as separate configurable layers with independent DMRS associations. This dimensional expansion allows the system to allocate resources and apply different modulation schemes (like M-PAM) to different dimensions, thereby improving spectral efficiency and adaptability.
2Productivity
If M-PAM constellations are introduced for real-valued modulation, then spectral efficiency improves, but the system requires new demodulation reference signalling mechanisms
Solution Approach 1:
The patent creates a universal DMRS framework that can serve both traditional complex-valued modulations and new real-valued M-PAM modulations. By configuring DMRS associations with layer indicators that specify whether real or imaginary layers are present, the system achieves multi-functionality without requiring separate reference signal mechanisms for different modulation types.
Solution Approach 2:
The patent changes the configuration parameters of DMRS by introducing layer-specific indicators that specify the presence and type of layers (real, imaginary, or both). This parameter change allows the system to adapt DMRS transmission and processing to match the specific modulation scheme being used, enabling M-PAM while maintaining a unified reference signal framework.
3Productivity
If multiple wireless devices share one QAM transmission, then resource utilization improves, but interference between devices increases
Solution Approach 1:
The patent segments the shared QAM transmission into separate real and imaginary layers, each of which can be independently decoded by different wireless devices. This segmentation allows devices to focus on decoding specific layers, reducing the impact of interference from other devices' data while improving overall resource utilization through non-orthogonal multiple access.
Data Source
AI summary
Disclosed is a method, performed by a network node, for demodulation reference signalling. The method comprises transmitting, to a wireless device, control signalling indicative of layer configuration associated with an upcoming demodulation reference signal, DMRS. The layer configuration comprises a type of layer. The type of layer can comprise a data layer, and/or an interference layer.