UE PAPR Reduction via SFMT Null Space Transmission
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in reducing the peak to average power ratio (PAPR) of downlink signals, which increases power consumption in user equipment (UE) due to higher bandwidths and increased data rates, leading to higher power consumption and heat dissipation issues.
Innovation Solution
The system employs a space frequency multiple transmission reception point (SFMT) approach where the base station transmits a PAPR reduction signal into the UE's null space, utilizing the SFMT report from the UE to adjust the downlink signal, thereby reducing PAPR without affecting the bit error rate (BER).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher bandwidths and increased data rates are used in 5G NR, then communication capacity and speed are improved, but power consumption and heat dissipation increase
Solution Approach 1:
The patent extracts and removes the PAPR reduction signal from the main downlink signal by transmitting it into the UE null space. This separation allows the UE to process the main signal with high resolution ADCs while the PAPR reduction signal is handled separately, enabling power savings without compromising communication capacity
Solution Approach 2:
The patent changes the parameter of signal resolution by allowing the UE to use lower resolution ADCs specifically for processing the PAPR reduction signal while maintaining high resolution for the main downlink signal. This parameter differentiation reduces power consumption while preserving overall communication capacity
2Speed
If higher bandwidths and increased data rates are used in 5G NR, then communication speed is improved, but heat dissipation increases
Solution Approach 1:
The patent extracts the heat-generating PAPR reduction processing from the main signal processing path by transmitting it in the null space. This allows the UE to handle the high-speed main signal separately from the PAPR reduction signal, reducing overall heat dissipation while maintaining data rate performance
3Use of energy by moving object
If PAPR reduction signal is transmitted into UE null space, then power consumption is reduced, but signal processing complexity increases
Solution Approach 1:
The patent introduces the UE null space as an intermediary channel for transmitting the PAPR reduction signal. This intermediary approach allows the signal to be transmitted without interfering with the main downlink signal, reducing power consumption while managing processing complexity through spatial separation
4Use of energy by moving object
If lower resolution ADCs are used in UE, then power consumption is reduced, but signal quality may deteriorate
Solution Approach 1:
The patent applies local quality differentiation by using lower resolution ADCs specifically for the PAPR reduction signal while maintaining high resolution ADCs for the main downlink signal. This localized approach reduces power consumption for the PAPR component without compromising the overall signal quality required for reliable communication
Data Source
AI summary
A configuration to reduce a UE PAPR due to a transmission of a PAPR reduction signal into a UE null space. The apparatus establishes a connection with a base station. The apparatus transmits, to the base station, an SFMT report including an indication of a capability of the UE to process a signal form the base station that includes an SFMT transmission. The apparatus receives, from the base station, a downlink PAPR reduction signal based on the SFMT report of the UE.