Uplink Frequency Resource Allocation for PAPR Reduction
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Solution Overview
Problem
Existing wireless communication technologies face challenges in efficiently reducing peak-to-average power ratio (PAPR) in uplink transmissions, particularly in 5G and beyond, which limits cell coverage and requires power amplifier backoff, impacting performance in low-latency and high-reliability applications.
Innovation Solution
Implementing frequency domain spectral shaping (FDSS) with spectrum extension, where a user device determines and applies a target extension factor to allocate excess band frequency resources, extending the frequency domain values to reduce PAPR and enhance coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional uplink transmission methods are used, then device complexity remains low, but peak-to-average power ratio (PAPR) is high causing cell coverage limitations and requiring power amplifier backoff
Solution Approach 1:
The patent applies frequency domain spectral shaping by extending the spectrum in the frequency dimension. The user device performs spectrum extension on uplink signals by allocating excess band frequency resources beyond the inband resources, effectively adding a frequency dimension to the signal processing. This spectral extension reduces PAPR by distributing power across a wider frequency range, thereby reducing peak power levels without requiring additional time or power domains.
2Reliability
If power amplifier backoff is applied to reduce PAPR, then signal distortion decreases, but transmission power is reduced impacting data rate and coverage
Solution Approach 1:
The patent changes the frequency domain parameters of the uplink signal by introducing spectrum extension with a configurable extension factor. The network node configures excess band frequency resources, and the user device applies spectral shaping by modifying the frequency content of the signal. This parameter change allows the system to reduce PAPR through frequency domain manipulation rather than reducing transmission power, thereby maintaining both signal quality and transmission power levels.
3Area of stationary object
If spectrum extension is implemented to reduce PAPR, then cell coverage increases, but frequency resource allocation complexity increases
Solution Approach 1:
The patent implements dynamic frequency resource allocation for spectrum extension. The network node dynamically configures the extension factor and excess band frequency resources based on current channel conditions and user requirements. The user device dynamically adjusts its spectral shaping operation according to the configured parameters, allowing the system to adaptively manage frequency resources while expanding cell coverage through PAPR reduction.
4Power
If frequency domain spectral shaping with spectrum extension is applied, then PAPR is reduced enabling higher power transmission, but processing time and computational complexity increase
Solution Approach 1:
The patent performs spectrum extension and frequency domain spectral shaping operations in advance before the actual uplink transmission. The network node configures the extension parameters and the user device pre-processes the signal by allocating excess band frequency resources and applying spectral shaping. This preliminary action allows the PAPR reduction to be achieved before transmission, enabling higher power transmission without increasing processing time during the actual data transmission phase.
Data Source
AI summary
A method including receiving, by a user device from a network node, a configuration including at least an indication to perform spectrum extension; determining a target extension factor for excess band frequency resources for a target spectrum extension; receiving information indicating a set of inband frequency resources allocated to the user device for uplink transmission; determining, by the user device based on the set of inband frequency resources and the target extension factor, the excess band frequency resources for the spectrum extension and/or a total allocation of frequency resources for uplink transmission, wherein the total allocation of frequency resources includes the inband frequency resources and the excess band frequency resources; performing, by the user device, a spectrum extension based on the excess band frequency resources for a set of frequency domain values, to obtain a spectrum extended signal; and transmitting the spectrum extended signal.