DM-RS Parameter Sets for MU-MIMO Multiplexing
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Solution Overview
Problem
Current wireless communication systems, such as LTE, face challenges in efficiently transmitting reference signals for multi-user multiplexing in multi-antenna-based systems, particularly in reducing overhead and improving channel estimation accuracy, which affects MU-MIMO performance due to limitations in DM-RS antenna port configurations and quasi-co-location assumptions.
Innovation Solution
The method involves configuring multiple parameter sets for DM-RS transmission, including scrambling identifiers and OCC lengths, to enable efficient DM-RS sequence generation and transmission, allowing for extended DM-RS antenna port usage and orthogonal/quasi-orthogonal DM-RS generation across multiple layers, thereby enhancing MU-MIMO capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current LTE DM-RS antenna port configurations are used, then system compatibility is maintained, but the number of supported MU-MIMO users and layers is limited
Solution Approach 1:
The patent segments the DM-RS configuration into multiple parameter sets (first, second, third parameter sets) with different scrambling identifiers and OCC lengths. This allows the system to support multiple MU-MIMO users and layers by selectively applying different parameter sets, thereby increasing adaptability while managing complexity through structured organization of configuration parameters.
Solution Approach 2:
The patent introduces dynamic configuration of DM-RS parameters through higher layer signaling that can be adjusted based on the number of MU-MIMO users and layers. The system dynamically selects appropriate parameter sets (first, second, or third) depending on the multiplexing requirements, enabling flexible adaptation to different MU-MIMO scenarios without requiring complete system redesign.
2Measurement precision
If multiple parameter sets with different scrambling identifiers are configured, then channel estimation accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent utilizes parameter changes in the form of different scrambling identifiers (first, second, third scrambling identifiers) and OCC lengths to improve channel estimation accuracy for multiple MU-MIMO users. By varying these parameters across different parameter sets, the system achieves better multiplexing performance while controlling overhead through efficient parameter utilization.
Solution Approach 2:
The patent designs the parameter sets to serve multiple functions: they provide channel estimation references for multiple MU-MIMO users simultaneously, enable different scrambling patterns for orthogonal separation, and can be dynamically selected based on system requirements. This multi-functionality reduces the need for separate dedicated reference signals for each user, thereby managing overhead effectively.
3Productivity
If DM-RS sequence generation is extended to multiple layers, then MU-MIMO capacity increases, but the complexity of DM-RS configuration and management increases
Solution Approach 1:
The patent extends DM-RS sequence generation from single-layer to multi-layer operation by introducing additional parameter dimensions (different scrambling identifiers and OCC lengths for different layers). This dimensional extension enables simultaneous support for multiple MU-MIMO users and layers, increasing capacity while organizing complexity through systematic parameter assignment across layers.
Solution Approach 2:
The patent performs preliminary configuration of multiple parameter sets through higher layer signaling before actual MU-MIMO transmission begins. By pre-configuring the first, second, and third parameter sets with their respective scrambling identifiers and OCC lengths, the system prepares everything needed for multi-layer DM-RS generation in advance, reducing real-time configuration complexity and enabling efficient multi-user multiplexing.
Data Source
AI summary
The present specification proposes a method for a user equipment to receive a DM-RS (demodulation-reference signal) from a base station in a multi-antenna-based wireless communication system. Specifically, the method includes the step of configuring a plurality of parameter sets via a higher layer signaling, receiving a downlink control signal including information on an antenna port for the DM-RS and a number of layers, and receiving the DM-RS and a downlink data signal corresponding to the DM-RS based on the downlink control signal. In this case, the downlink control signal comprises an indicator for indicating one of a plurality of the parameter sets and each of a plurality of the parameter sets comprises information indicating a scrambling identifier of the DM-RS.