DMRS Time Bundling for Channel Estimation in 5G Wireless Systems
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Solution Overview
Problem
In 5G wireless communication systems, the coexistence of different services such as enhanced mobile broadband (eMBB), massive machine-type communications (mMTC), and ultra-reliable and low-latency communications (URLLC) poses challenges in channel estimation and data transmission, particularly due to the limited resources available for reference signals (RS), which affects the demodulation and decoding performance.
Innovation Solution
The implementation of DMRS bundling in both time and frequency domains to enhance channel estimation performance, allowing for improved demodulation and decoding of data signals by bundling DMRSs across consecutive slots, thereby increasing data demodulation and decoding probabilities while adapting to different scheduling scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple services (eMBB, mMTC, URLLC) are provided simultaneously in 5G wireless communication systems, then service diversity and coverage are improved, but channel estimation performance and data demodulation reliability deteriorate due to limited reference signal resources
Solution Approach 1:
The patent segments the channel estimation process by introducing separate first channel estimation values from first reference signals and second channel estimation values from second reference signals. This segmentation allows different service types to use different reference signal resources, preventing resource conflicts and maintaining reliable channel estimation for each service despite the presence of multiple simultaneous services.
2Reliability
If reference signal resources are increased to improve channel estimation performance, then data demodulation reliability is improved, but system resource efficiency and throughput deteriorate due to resource overhead
Solution Approach 1:
The patent implements a universal reference signal framework where first reference signals serve eMBB services and second reference signals serve mMTC and URLLC services. This multi-functional approach allows the system to maintain reliable data demodulation for diverse service types without proportionally increasing overall reference signal overhead, as different reference signal sets are optimized for different service requirements.
3Measurement precision
If DMRS bundling is performed across multiple slots to improve channel estimation accuracy, then data demodulation performance is improved, but system flexibility and adaptability to different scheduling scenarios deteriorate
Solution Approach 1:
The patent introduces dynamic switching capability between first channel estimation values and second channel estimation values based on service type and scheduling conditions. The terminal can dynamically select which channel estimation value to use for data demodulation, and the system can dynamically adjust the bundling configuration. This dynamic approach maintains high channel estimation accuracy through bundling while preserving scheduling flexibility by adapting to different service requirements and channel conditions.
Data Source
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AI summary
A method, performed by a terminal in a wireless communication system, of transmitting and receiving data information is provided. The method includes receiving multiple transmission unit scheduling information, receiving information about whether demodulation reference signal (DMRS) time bundling is feasible with respect to DMRS information respectively contained in a plurality of transmission units scheduled according to the multiple transmission unit scheduling information, and when the information indicates that the DMRS time bundling is feasible, performing decoding on data information based on at least one of a hybrid automatic request (HARQ) acknowledge (ACK)/negative acknowledge (NACK) transmission time, a size of a frequency resource of a downlink (DL) physical data channel to which the data information scheduled according to the multiple transmission unit scheduling information is assigned, a timing advance value, and a time required for a valid data process.