Uplink Control Resource Allocation for Spectral Efficiency
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Solution Overview
Problem
In 5G/NR radio communication systems, the lack of demodulation reference signals for uplink control information leads to low spectral usage efficiency, particularly due to the inefficiency of NACK-based A/N feedback methods which result in increased overhead and resource wastage.
Innovation Solution
A user terminal is designed with a control section that determines resource allocation for uplink control information transmission, allowing for the use of either unallocated or shared resources, thereby optimizing resource usage without relying on demodulation reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If NACK-based A/N feedback method is used without demodulation reference signals, then uplink control information transmission is simplified, but spectral usage efficiency deteriorates due to resource wastage
Solution Approach 1:
The patent changes the parameter of resource allocation by introducing a determination mechanism that selects between first resources (unallocated) and second resources (allocated to other terminals) based on terminal identification information. This parameter change enables the system to adaptively allocate resources, avoiding wastage of allocated resources while maintaining simplified transmission without demodulation reference signals.
2Device complexity
If demodulation reference signals are eliminated for uplink control information, then transmission overhead is reduced, but spectral usage efficiency deteriorates due to inability to demodulate control information
Solution Approach 1:
The patent introduces terminal identification information as an intermediary element that enables the base station to identify which terminal is transmitting uplink control information without requiring demodulation reference signals. This intermediary allows the base station to accurately determine the transmitting terminal based on resource allocation patterns, thereby maintaining demodulation capability while eliminating reference signals.
Solution Approach 2:
The patent implements a feedback mechanism where the base station determines resource allocation based on terminal identification information and uses this feedback to accurately identify the transmitting terminal. The base station receives terminal identification information and determines whether to allocate first or second resources, creating a feedback loop that maintains communication reliability without demodulation reference signals.
3Loss of energy
If first resources (unallocated) are used for uplink control information transmission, then spectral usage efficiency is improved, but resource allocation complexity increases
Solution Approach 1:
The patent introduces dynamic resource allocation by allowing the system to switch between first resources (unallocated) and second resources (allocated to other terminals) based on real-time terminal identification information. This dynamic mechanism enables the system to adaptively select the most efficient resource type, improving spectral usage efficiency while managing allocation complexity through conditional logic rather than fixed rules.
Data Source
AI summary
To suppress decreases in spectral usage efficiency, even in the case of not using a reference signal in demodulation of uplink control information, a user terminal according to one aspect of the present invention is characterized by having a control section that determines whether or not to use a predetermined resource in transmission based on uplink control information to notify, and a transmitting section that transmits a signal in the predetermined resource when it is determined that the predetermined resource is used in transmission, where the predetermined resource is one of a first resource that is not allocated to another user terminal and a second resource that is allocated also to another user terminal.