NR PSCCH Design with DM-RS and Waveform Selection
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Solution Overview
Problem
Existing 3GPP New Radio (NR) wireless communication systems do not support WTRU-to-WTRU communication designs, such as device-to-device (D2D) or V2X communication, which are essential for vehicle platooning, extended sensors, and advanced driving applications, and LTE-based solutions are not compatible with NR networks.
Innovation Solution
A physical sidelink control channel (PSCCH) design in NR is developed, allowing wireless transmit/receive units (WTRUs) to determine DM-RS density based on HARQ parameters and association information, and select between OFDM and DFT-S-OFDM waveforms for sidelink transmissions, with HARQ feedback enabled or disabled.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LTE-based WTRU-to-WTRU communication solutions are used, then device-to-device communication is supported, but compatibility with NR networks is lost
Solution Approach 1:
The patent applies parameter changes by transitioning from LTE-based communication parameters to NR-specific parameters for sidelink communication. This includes defining new physical channel structures (PSCCH, PSSCH), new reference signal types (DM-RS with different densities), and new waveform options (CP-OFDM and DFT-S-OFDM) that are specific to NR, thereby achieving both reliable D2D communication and NR network compatibility simultaneously
2Measurement precision
If DM-RS density is increased for sidelink transmissions, then channel estimation accuracy is improved, but resource overhead increases
Solution Approach 1:
The patent implements dynamics by making DM-RS density configurable and adaptable based on communication conditions. The system allows dynamic selection of DM-RS density levels (e.g., normal density or reduced density) depending on channel conditions, traffic type, and reliability requirements, thereby optimizing the balance between channel estimation accuracy and resource efficiency for different sidelink scenarios
3Reliability
If HARQ feedback is enabled for sidelink communication, then transmission reliability is improved, but system complexity increases
Solution Approach 1:
The patent implements feedback mechanisms by introducing HARQ feedback for sidelink communications. The system enables receiving WTRUs to send HARQ acknowledgments (ACK/NACK) to transmitting WTRUs, allowing for retransmissions when errors occur. This feedback loop significantly improves transmission reliability for critical V2X applications while managing complexity through standardized procedures
Data Source
AI summary
A wireless transmit receive unit (WTRU) may receive a physical control channel transmission including control information for a data transmission. The WTRU may determine between a first type of waveform and a second type of waveform for the data transmission based on at least a format of the control information. Further, the WTRU may transmit the data transmission using the determined type of waveform. In an example, the type of waveform is further determined based on indication information included in the physical control channel transmission. Also, the first type of waveform may be an orthogonal frequency division multiplexing (OFDM) waveform and the second type of waveform is a discrete Fourier transform spread OFDM (DFT-S-OFDM) waveform. Moreover, the determination between the first type of waveform and the second type of waveform may be further based on an indication to use the DFT-S-OFDM waveform.