5G NR Uplink MCS Allocation Without Closed-Loop Power Control
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Solution Overview
Problem
In 5G NR systems, the use of closed-loop power control for uplink data transmission in environments with multiple UEs leads to significant resource consumption at the base station, reducing efficiency and performance due to the need for transmitting power control messages.
Innovation Solution
A method is proposed where the base station determines the MCS and allocates radio resources without using power control messages by utilizing power headroom information from UEs to calculate virtual SINR, selecting appropriate resource blocks, and adjusting MCS and resource allocations based on target SINR and data transmission requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If closed-loop power control is used to optimize uplink data transmission, then uplink transmission efficiency is improved, but base station resource consumption increases and base station performance decreases
Solution Approach 1:
The patent extracts the power control functionality from the base station and implements it at the UE side. The base station no longer needs to receive signals from all UEs, generate power control messages, and transmit them to each UE. Instead, UEs autonomously determine their own transmission parameters based on open-loop power control, eliminating the need for closed-loop power control messaging and reducing base station resource consumption.
Solution Approach 2:
The patent enables UEs to self-determine their transmission power and resources without base station intervention. Each UE calculates its own pathloss, determines appropriate transmission parameters, and autonomously adjusts its transmission, thereby eliminating the need for base station processing of power control messages and reducing overall system resource consumption.
2Measurement precision
If closed-loop power control messages are transmitted to each UE, then power control accuracy is improved, but radio resource usage increases
Solution Approach 1:
The patent removes the power control messaging mechanism from the system. Instead of transmitting power control messages from base station to UE, the system relies on UE autonomous determination of transmission parameters based on open-loop power control calculations, eliminating radio resource consumption for power control messaging.
Solution Approach 2:
The patent introduces pathloss as an intermediary parameter that UEs use to autonomously determine transmission power. Rather than receiving direct power control commands from the base station, UEs calculate pathloss and use it to self-adjust transmission parameters, eliminating the need for continuous power control messaging while maintaining reasonable power control accuracy.
3Productivity
If base station processes power control for all UEs, then uplink transmission optimization is improved, but base station processing load increases
Solution Approach 1:
The patent enables UEs to self-handle power control processing. Each UE independently calculates pathloss, determines transmission power, and adjusts its transmission parameters without base station intervention. This transfers the processing load from the base station to the UEs, significantly reducing base station complexity and processing requirements.
Solution Approach 2:
The patent extracts the power control processing function from the base station and relocates it to the UE side. The base station no longer needs to process signals from all UEs for power control purposes, eliminating the processing load while maintaining uplink transmission optimization through UE autonomous parameter determination.
Data Source
AI summary
The present disclosure relates to a method of a 5G NR system for selecting uplink MCSs and allocating resource blocks. Disclosed is a base station of a 5G NR system, including: at least one processor, and the at least one processor may be configured to determine whether power headroom information is received from a UE, calculate, when the power headroom information is received, a virtual SINR based on the power headroom information, the virtual SINR being an expected SINR when the UE transmits one resource block, select a maximum allowed quantity of resource blocks, calculate a first adjusted SINR based on the maximum allowed quantity of resource blocks, determine, based on a target SINR set per MCS, whether there are MCSs allowing the first adjusted SINR to be equal to or greater than the target SINR, select, when there are MCSs allowing the first adjusted SINR to be equal to or greater than the target SINR, a greatest MCS MCS1 along the MCSs and determine that the UE uses the selected MCS1 and RB1 combination for uplink data transmission.