Adaptive DMRS Structures for Low-Latency 5G Channel Estimation
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Solution Overview
Problem
The 5G wireless communication system requires new DMRS structures to support low latency and high mobility while minimizing reference signal overhead, especially in frequency bands up to 6 GHz or less, and to adaptively select suitable DMRS structures based on transmission environments.
Innovation Solution
A method for constructing multiple DMRS structures and allowing a base station to set DMRS structures suitable for varying transmission environments, enabling adaptive DMRS transmission and minimizing overhead, along with methods for determining transmission timing such as HARQ ACK/NACK timing to reduce delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single DMRS structure is used in the LTE system, then the reference signal overhead is minimized and the system is simple to implement, but it cannot support low latency and high mobility requirements of the 5G system
Solution Approach 1:
The patent divides the DMRS structure into multiple types (first type with first DMRS position and second type with second DMRS position) to support different transmission scenarios. This segmentation allows the system to select appropriate DMRS structures based on specific requirements for latency and mobility support.
Solution Approach 2:
The patent introduces dynamic selection mechanisms where the base station can choose between different DMRS structures based on current transmission conditions. The network can dynamically switch between first-type and second-type DMRS structures to adapt to varying latency and mobility requirements.
2Adaptability or versatility
If multiple DMRS structures are constructed to support different transmission environments, then adaptability to low latency and high mobility is improved, but the complexity of DMRS structure management increases
Solution Approach 1:
The patent pre-defines multiple DMRS structures with different characteristics (first-type and second-type) before actual transmission occurs. This preliminary preparation allows the system to quickly select from pre-configured options rather than dynamically creating structures during transmission, reducing management complexity.
Solution Approach 2:
The patent varies specific parameters of DMRS structures (such as DMRS position, mapping patterns, and resource allocation) to create different structure types. By changing key parameters rather than redesigning entire structures, the system achieves adaptability while maintaining manageable complexity.
3Productivity
If reference signal overhead is minimized in the 5G system, then spectral efficiency is improved, but the ability to support high mobility and low latency is compromised
Solution Approach 1:
The patent applies different DMRS structure types in different local scenarios - using first-type structures when low latency is critical and second-type structures when high mobility is the primary concern. This localized optimization ensures that reference signal overhead is minimized while maintaining adequate channel estimation performance for each specific scenario.
Data Source
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AI summary
Disclosed are a communication technique of merging, with IoT technology, a 5 G communication system for supporting a data transmission rate higher than that of a 4G system, and a system therefor. The disclosure can be applied to intelligent services (for example, smart home, smart building, smart city, smart car or connected car, healt h care, digital education, retailing, security and safety relate services, and the like) on t he basis of 5G communication technology and IoT related technology. Disclosed is a method by which a base station sets a plurality of demodulation reference signal (DM RS) structures and determines uplink and downlink transmission timing for reducing d elay.