Uplink Control Channel Transmission Resource Management
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, there is a need for a method to ensure reliable uplink signal transmission when the terminal fails to transmit at the scheduled time or requires retransmission, especially in unlicensed bands or when resources are not idle, to maintain system performance and reduce delays.
Innovation Solution
A method where a base station configures additional transmission resources for a terminal or reconfigures it to perform uplink signal transmission using existing resources, including the use of downlink control information (DCI) with ACK requests, HARQ processes, and specific fields like DAI and HARQ window to manage uplink signal transmission effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the terminal transmits uplink control channel at the scheduled time, then the system achieves efficient resource utilization, but the transmission may fail when resources are not idle or when interference occurs
Solution Approach 1:
The base station performs preliminary channel assessment and proactively identifies suitable alternative uplink resources before the scheduled transmission time. When the originally scheduled resource is found to be unavailable or interfered with, the base station has already prepared alternative resources, enabling the terminal to switch transmission resources without delay and ensuring both efficient resource utilization and reliable transmission.
2Reliability
If the terminal retransmits the uplink control channel when initial transmission fails, then the transmission reliability is improved, but the transmission delay increases
Solution Approach 1:
The base station performs preliminary identification and reservation of alternative uplink transmission resources before the terminal's scheduled transmission time. When transmission failure occurs, the terminal can immediately switch to the pre-identified alternative resource without waiting for retransmission scheduling, thereby maintaining high reliability while minimizing additional delay.
Solution Approach 2:
The base station continuously monitors the uplink control channel transmission status and provides feedback to the terminal about transmission success or failure. Based on this feedback, the terminal determines whether to switch to alternative resources, enabling adaptive retransmission that reduces unnecessary delays while ensuring reliable delivery.
3Reliability
If the base station configures additional transmission resources for the terminal, then the transmission reliability is improved, but the system resource overhead increases
Solution Approach 1:
Instead of configuring additional uplink resources for all terminals universally, the base station applies resource configuration locally and selectively - only for terminals that experience transmission failures or operate in challenging channel conditions. This localized approach ensures high reliability for affected terminals while minimizing overall system resource overhead.
Solution Approach 2:
The base station dynamically adjusts the number and quality of alternative resources configured based on terminal-specific parameters such as channel conditions, transmission history, and service requirements. This parameter-based adaptation ensures that resources are allocated efficiently - providing sufficient alternatives for terminals needing reliability while avoiding unnecessary resource consumption for terminals with good transmission conditions.
Data Source
AI summary
A method for transmitting an uplink signal by a terminal in a wireless communication system according to the present invention comprises the steps of: receiving a downlink signal from a base station; receiving downlink control information (DCI) for requesting transmission of an uplink signal corresponding to the downlink signal, from the base station; and transmitting, to the base station, a response to the downlink signal on the basis of a message, wherein the DCI includes at least one among an ACK window field, a DAI field, and an ACK request field for requesting the response to the downlink signal.