NR Reference-to-PDSCH Power Offsets for CSI and Demodulation
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Solution Overview
Problem
In the context of new radio (NR) communications, the accuracy of channel state information (CSI) reporting and downlink data channel demodulation is compromised due to the use of single-carrier waveforms, particularly in high-frequency scenarios, necessitating a method to notify power differences to ensure accurate CSI reporting and demodulation.
Innovation Solution
A method is provided for notifying power differences between reference signals and physical downlink shared channels (PDSCH) using various waveforms and modulation schemes, enabling the terminal device to accurately deduce CSI and demodulate downlink data channels by configuring power offsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single-carrier waveform is used for downlink transmission, then uplink coverage is improved, but accuracy of CSI reporting and downlink data channel demodulation deteriorates
Solution Approach 1:
The patent introduces a power difference parameter (powerOffset) that quantifies the power relationship between reference signals and data channels. By notifying the terminal device of this parameter, the system compensates for the inherent inaccuracies in single-carrier waveform transmissions, allowing the terminal to correctly interpret channel state information and demodulate data despite the waveform's limitations in maintaining consistent power characteristics.
2Reliability
If single-carrier waveform is used for downlink transmission, then uplink coverage is improved, but demodulation accuracy of downlink data channel deteriorates
Solution Approach 1:
The network device performs a preliminary action by calculating and notifying the power difference parameter before the terminal device attempts demodulation. This advance notification allows the terminal to pre-compensate for power variations in the received signal, establishing the correct reference level for demodulation before the actual data reception occurs, thereby improving demodulation accuracy without changing the waveform itself.
3Measurement precision
If power difference notification is implemented, then CSI reporting accuracy is improved, but device complexity increases
Solution Approach 1:
The power difference parameter acts as an intermediary that bridges the gap between the network device's transmission and the terminal device's reception. Rather than implementing complex adaptive waveform switching or real-time power adjustment mechanisms, the system uses this single numerical parameter to convey essential power relationship information, simplifying the overall system architecture while maintaining CSI reporting accuracy.
Data Source
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AI summary
This application discloses a method and a device for notifying information about a power difference, and relates to the communications field. A network device sends, to a terminal device, information about power differences corresponding to different waveforms and/or modulation schemes. The power difference is an offset between a power of a reference signal and a power of a PDSCH on which a specific waveform or modulation scheme is used, and is used by the terminal device to calculate CSI.