DFT-s-OFDM Reference Signal Segmentation for Flexible CSI Transmission
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Solution Overview
Problem
The design of next-generation wireless communication systems faces challenges in meeting diverse use-case specific requirements for enhanced mobile broadband, ultra-reliable low latency communications, and massive machine type communications, particularly in optimizing the physical layer waveform for flexibility and efficiency in channel state information determination.
Innovation Solution
Implementing methods and apparatus for configuring and transmitting discrete Fourier transform-spread-orthogonal frequency division multiplexing (DFT-s-OFDM) symbols with reference signals, allowing for modes that include either data tones or null tones, and segmenting these symbols to optimize channel state information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If reference signals are transmitted with data tones in DFT-s-OFDM symbols, then channel state information transmission efficiency is improved, but flexibility in supporting diverse use cases deteriorates
Solution Approach 1:
The DFT-s-OFDM symbol is segmented into multiple parts: reference signal tones, data tones, and null tones. This segmentation allows the system to flexibly configure the composition of each symbol based on different use case requirements, while maintaining efficient channel state information transmission through dedicated reference signal chunks within each segment.
Solution Approach 2:
The patent introduces dynamic mode indication where the transmitter can switch between different transmission modes (first mode with data tones, second mode with null tones) based on received mode indication information. This dynamic adaptability allows the system to optimize performance for different use cases while maintaining efficient channel state information transmission.
2Adaptability or versatility
If DFT-s-OFDM symbols are segmented with chunks of reference signal tones, then flexibility in configuration is improved, but device complexity increases
Solution Approach 1:
The reference signal sequence is divided into segments with specific chunks allocated to different purposes. This segmentation provides flexible configuration for different use cases while using systematic division methods that minimize processing complexity through regular patterns and standardized chunk structures.
Solution Approach 2:
The patent employs parameter-based configuration where the number of reference signal tones, data tones, and null tones can be adjusted through mode indication. This allows flexible adaptation to different use cases by changing parameters rather than restructuring the entire system, thereby managing device complexity.
3Adaptability or versatility
If mode indication information is received and transmitted accordingly, then adaptability to different use cases is improved, but processing overhead increases
Solution Approach 1:
The mode indication mechanism serves multiple functions: it signals the transmission mode, determines the composition of DFT-s-OFDM symbols, and enables adaptation to different use cases. This multi-functionality reduces the need for separate signaling mechanisms, thereby minimizing processing overhead while maintaining high adaptability.
Data Source
AI summary
Methods, apparatus, systems, architectures and interfaces for reference signal (RS) configuration, generation, and/or transmission in a transmitter/receiver. The method includes receiving information indicating any of at least first and second modes of operation for transmitting a discrete Fourier transform (DFT)-spread-orthogonal frequency division multiplexing (DFT-s-OFDM) symbol including a reference signal (RS), and transmitting the DFT-s-OFDM symbol including: (1) the RS and data tones, on condition that the information indicates the first mode; or (2) the RS and null tones, on condition that the information indicates the second mode, wherein the DFT-s-OFDM symbol is divided into a number of segments, each including a chunk of RS tones, and wherein any of a size or a location of the chunk is determined according to any of the first or second modes.