Cell-Specific Reference Signal Modulation for Demodulation Performance
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Solution Overview
Problem
Current cell-specific reference signal configurations in communication technologies, such as LTE and NR, result in lower reception power for CRS compared to PDSCH, leading to reduced demodulation performance due to fixed QPSK modulation and higher Peak-to-Average Power Ratio (PAPR), which affects data demodulation efficiency.
Innovation Solution
Configuring the modulation mode of regular cell-specific reference signals to match or exceed the PAPR of the data to be demodulated, allowing for flexible modulation mode selection, such as π2-BPSK or QPSK, and indicating this mode through synchronization signal blocks (SSBs) to enhance reception power and demodulation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed QPSK modulation is used for cell-specific reference signal, then modulation simplicity is maintained, but reception power is reduced and demodulation performance deteriorates
Solution Approach 1:
The patent applies dynamics by making the modulation mode of CRS configurable and adaptable rather than fixed. The base station can dynamically select different modulation modes (QPSK, π/2-BPSK, or other modes) for CRS based on channel conditions and data requirements, allowing the system to optimize reception power and demodulation performance while maintaining manageable complexity through standardized configuration procedures
Solution Approach 2:
The patent changes the modulation mode parameter of CRS from a fixed value to a configurable parameter. By allowing the modulation mode to be adjusted according to different scenarios and indicated through SSB, the system can optimize reception power and demodulation performance without excessive complexity, as the configuration is managed through existing signaling mechanisms
2Reliability
If higher PAPR modulation mode is used for CRS, then reception power increases, but PAPR exceeds data modulation requirements affecting demodulation efficiency
Solution Approach 1:
The patent changes the PAPR parameter of CRS by selecting modulation modes with appropriate PAPR characteristics. Instead of using high PAPR modes that would increase reception power but harm demodulation efficiency, the system selects modulation modes whose PAPR is less than or equal to that of the data to be demodulated, optimizing both reception power and demodulation efficiency simultaneously
Solution Approach 2:
The patent implements feedback by indicating the CRS modulation mode through SSB, allowing the terminal to understand and adapt to the configured modulation mode. This feedback mechanism ensures that the terminal can properly demodulate the CRS and use it for accurate data demodulation, maintaining efficiency while benefiting from optimized reception power
Data Source
AI summary
A cell-specific reference signal configuration method and device, a storage medium, a base station, and a UE are provided. The method includes: determining to configure a regular cell-specific reference signal in a current time slot; determining an SSB in the current time slot based on the SSB existing in the current time slot, or determining an SSB in a previous SSB time slot based on an SSB not existing in the current time slot and indicating a modulation mode of the regular cell-specific reference signal in the current time slot using modulation mode indication information in the determined SSB, or determining the modulation mode of the regular cell-specific reference signal to be a preset modulation mode, wherein a peak-to-average ratio of the modulation mode of the regular cell-specific reference signal isn't greater than that of data to be demodulated by using the regular cell-specific reference signal.