DM-RS Reception With Time-Domain Multiplexing for Multi-User MIMO
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently handling increasing data traffic, high per-user transmission rates, and low latency while supporting a large number of devices, particularly in multi-user-multi-input multi-output scenarios, where demodulation reference signals (DM-RS) are not effectively multiplexed without increasing overhead.
Innovation Solution
A method for configuring and multiplexing DM-RS in a time domain by providing UE-specific or BS-specific information about DM-RS symbols, including a first front-loaded symbol and additional symbols, with options for time division multiplexing, allowing terminals to receive DM-RS without increasing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If time division multiplexing is applied to multiplex DM-RS for multiple UEs, then resource utilization efficiency is improved, but system complexity increases due to UE-specific configuration management
Solution Approach 1:
The DM-RS configuration is segmented into UE-specific parameters, allowing different UEs to have individually configured DM-RS symbol positions and TDM patterns. This enables precise control over resource allocation for each UE while maintaining overall system efficiency through structured configuration management.
Solution Approach 2:
The system employs dynamic TDM configuration where DM-RS symbols are flexibly allocated to different UEs based on instantaneous resource needs. The configuration can be adjusted per scheduling decision, enabling adaptive resource utilization that responds to changing traffic conditions while managing complexity through standardized configuration procedures.
2Adaptability or versatility
If DM-RS overhead is increased to support more orthogonal DM-RS ports, then multi-user MIMO capability is improved, but signal overhead increases
Solution Approach 1:
The patent introduces time domain multiplexing as an additional dimension for DM-RS port multiplexing. Instead of solely relying on frequency and code domains, DM-RS symbols are multiplexed across different time symbols, effectively increasing the number of available orthogonal ports without proportionally increasing overhead in any single resource dimension.
Solution Approach 2:
The system changes the configuration parameters of DM-RS symbols, including their positions in the time domain and association with different UEs. By dynamically adjusting which symbols contain DM-RS for which UEs, the system optimizes the balance between supporting multiple users and minimizing overall overhead.
Data Source
AI summary
A method comprises the steps of: receiving DM-RS configuration information from a base station (BS); wherein the DM-RS configuration information comprises (i) information related to a plurality of first DM-RS symbols including one first FL DM-RS symbol and at least one first additional DM-RS symbol, (ii) information about whether TDM is configured for the at least one first additional DM-RS symbol, and (iii) information about one specific DM-RS symbol from among the plurality of first DM-RS symbols; determining at least one second DM-RS symbol including the specific DM-RS symbol on the basis of the DM-RS configuration information; and receiving, from the BS, a first DM-RS only for the at least one second DM-RS symbol from among the plurality of first DM-RS symbols.