DMRS Data Multiplexing in 5G Resource Elements
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Solution Overview
Problem
In next-generation/5G radio access networks, there is a need to efficiently allocate data to empty resource elements (RE) present on symbols where demodulation reference signals (DMRS) are placed, and to signal data allocation information effectively to user equipment (UE) in order to support various usage scenarios such as eMBB, mMTC, and URLLC, which require flexible frame structures and efficient multiplexing of radio resources.
Innovation Solution
A method is provided where a base station configures available RE patterns and transmits DMRS port allocation information to a terminal, allowing the terminal to receive this information and use available REs not allocated to DMRS for data transmission and reception, thereby multiplexing data and DMRSs within DMRS symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If DMRS symbols are used for reference signal transmission, then demodulation accuracy is improved, but resource utilization deteriorates due to empty REs
Solution Approach 1:
The patent merges DMRS and data transmission by allowing data to be multiplexed on the same time-frequency resources as DMRS. Specifically, multiple layers of data can be transmitted simultaneously with DMRS on the same resource elements, combining reference signal function and data transmission function into a single resource allocation, thereby improving resource utilization while maintaining demodulation accuracy.
Solution Approach 2:
The patent makes resource elements multi-functional by enabling them to serve both as DMRS carriers and data carriers. The same time-frequency resources that traditionally only carried reference signals now can simultaneously carry both DMRS and data layers, making the system more versatile and efficient in resource usage.
2Adaptability or versatility
If flexible frame structures are implemented to support various usage scenarios, then adaptability is improved, but system complexity increases
Solution Approach 1:
The patent introduces dynamic configurability in the multiplexing scheme, where the number of data layers and DMRS layers can be flexibly adjusted based on usage scenarios. The system can dynamically change the multiplexing configuration to adapt to different requirements (e.g., eMBB, mMTC, URLLC) without requiring completely different frame structures, thus maintaining flexibility while controlling complexity.
Solution Approach 2:
The patent changes key parameters such as the number of data layers (L) and DMRS layers (K) to adapt to different usage scenarios. By varying these parameters, the system can optimize performance for different scenarios without changing the fundamental frame structure, thereby improving adaptability while keeping the base structure simple and manageable.
Data Source
AI summary
The provided are a method of transmitting and receiving data using empty resource elements (REs) located in a demodulation reference signal (DMRS) symbol in a next-generation/5G radio access network. The method of a base station for transmitting DMRS port allocation information to a terminal may include configuring one or more available RE patterns; transmitting, to the terminal, information indicating an available RE pattern to be used by the terminal among the available RE patterns; and transmitting the DMRS port allocation information to the terminal. The available RE pattern is composed of REs to which no DMRSs are allocated among REs located on a symbol to which DMRSs are to be allocated, and through the REs in the available RE pattern, the base station receives uplink data from the terminal or transmits downlink data to the terminal.