Terminal Apparatus Multiplexing Demodulation Reference Signal and Uplink Data
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the context of 5G NR communication systems, there is a need for efficient control of reference signal configurations and switching between DFT-S-OFDM and CP-OFDM for data transmission, including decisions on whether to multiplex data and reference signals within OFDM symbols.
Innovation Solution
A base station and terminal apparatus configuration that receives and transmits demodulation reference signals and uplink data using the same OFDM symbol, with control information indicating the configuration and transmission scheme, allowing for efficient multiplexing and switching between DFT-S-OFDM and CP-OFDM based on higher layer signaling and DCI fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple switching operations are performed for reference signal configurations and transmission schemes, then communication flexibility and adaptability are improved, but control complexity and signaling overhead increase
Solution Approach 1:
The control information is segmented into two distinct parts: higher layer signaling that carries first information on DMRS configuration, and physical downlink control channel (PDCCH) signaling that carries second information on transmission scheme switching. This segmentation allows independent optimization of each control layer and reduces the complexity of managing multiple switching operations within a single signaling structure.
Solution Approach 2:
The system implements dynamic switching capabilities where the terminal can transition between different transmission schemes (DFT-S-OFDM and CP-OFDM) and reference signal configurations based on real-time channel conditions and network requirements. The dynamic nature is controlled through flexible signaling that allows the base station to adaptively adjust parameters without requiring complete reconfiguration.
2Productivity
If data and reference signals are multiplexed in the same OFDM symbol, then resource utilization efficiency is improved, but signal interference and demodulation difficulty increase
Solution Approach 1:
Different local qualities are applied to different regions within the OFDM symbol. Reference signals are allocated to specific resource elements with high reliability requirements, while data occupies other resource elements. The system applies different processing and protection strategies to each type of signal based on its local requirements, allowing efficient multiplexing while maintaining demodulation reliability.
Solution Approach 2:
The control information acts as an intermediary that coordinates the multiplexing of data and reference signals. By providing explicit instructions through higher layer signaling and PDCCH, the system manages the resource allocation and signaling between data and reference signals, ensuring that both can coexist in the same OFDM symbol without compromising reliability.
3Use of energy by moving object
If DFT-S-OFDM is used for uplink transmission, then power efficiency is improved, but frequency selective fading tolerance decreases
Solution Approach 1:
The system dynamically changes the transmission parameter by switching between DFT-S-OFDM and CP-OFDM based on channel conditions. When channel conditions are favorable, DFT-S-OFDM is used for power efficiency. When frequency selective fading is severe, the system transitions to CP-OFDM which provides better fading tolerance. This parameter change is controlled through the transmission scheme indication in the PDCCH.
Data Source
AI summary
A receiver configured to receive first information on a configuration of a demodulation reference signal via higher layer signaling and receive downlink control information including second information on transmission of the demodulation reference signal via a physical downlink control channel, and a transmitter configured to transmit the demodulation reference signal and uplink data are included. The transmitter transmits the demodulation reference signal and the uplink data by using a same OFDM symbol based on at least the first information and the second information.