5G NR Resource Block Allocation for Traffic-Priority Power Back-Off
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
5G NR UEs face challenges with non-linear distortion due to high peak-to-average power ratio (PAPR) in power amplifiers (PAs), leading to reduced coverage and performance when operating close to saturation, necessitating power back-off which affects modulation performance and coverage.
Innovation Solution
A network node allocates Inner, Outer, or Edge resource blocks to UEs based on traffic priority, using QoS identifiers, network slice service types, or emergency call indications, and configures DFT-s-OFDM waveform for high-priority traffic to minimize power reduction and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the PA operates close to saturation for maximum efficiency, then power efficiency is improved, but non-linear distortion increases causing receiver desensitization
Solution Approach 1:
The patent changes the operating parameter (power level) of the PA by applying power back-off, lowering the power level from the saturation point to ensure operation in the linear region. This parameter change resolves the contradiction by sacrificing some power efficiency to eliminate non-linear distortion and maintain signal quality.
2Object-generated harmful factors
If power back-off is applied to avoid non-linear distortion, then non-linear distortion is reduced, but UL transmit power decreases affecting coverage and performance
Solution Approach 1:
The patent applies local quality by differentiating resource block allocation based on traffic priority. High-priority traffic receives inner resource blocks with lower MPR (less power back-off), while low-priority traffic receives outer resource blocks with higher MPR (more power back-off). This allows the system to minimize power reduction for critical traffic while still applying power back-off where acceptable, resolving the contradiction between reducing distortion and maintaining transmit power.
3Object-generated harmful factors
If higher MPR is applied to avoid non-linear distortion, then non-linear distortion is reduced, but UL performance and coverage decrease
Solution Approach 1:
The patent changes the MPR parameter dynamically based on traffic priority and resource block location. By adjusting MPR according to the specific combination of modulation, resource blocks assigned, and traffic priority, the system optimizes the balance between avoiding non-linear distortion and maintaining UL performance and coverage.
4Productivity
If CP-OFDM waveform is used for better spectral efficiency, then spectral efficiency is improved, but PAPR increases requiring higher power reduction
Solution Approach 1:
The patent applies local quality by allocating specific resource blocks (inner vs. outer) to different traffic priorities within the CP-OFDM waveform structure. This allows high-priority traffic to use inner resource blocks with lower MPR requirements, thereby maintaining both the spectral efficiency benefits of CP-OFDM and adequate transmit power for critical communications.
Data Source
AI summary
The disclosed technology provides a system and method for allocating resource blocks to a mobile device based on a traffic priority of wireless resources between the network and the mobile device. Traffic priority can be determined based on quality of service (QOS) identifiers or network slice identifiers. The highest priority users are allocated inner resource blocks with the lowest allowed maximum power reduction (MPR), the lowest priority users are allocated edge resource blocks with the highest allowed MPR, and the intermediate priority users are allocated outer resource blocks.