Uplink Data Transmission HARQ-ACK State Adaptation
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Solution Overview
Problem
In LTE wireless communication systems, the simultaneous transmission of HARQ-ACK and uplink control information (UCI) can lead to inefficiencies, particularly when the HARQ-ACK state is DTX or NACK, as existing methods prioritize HARQ-ACK over UCI, resulting in dropped UCI and reduced uplink data transmission efficiency.
Innovation Solution
A method where the processor determines whether to transmit HARQ-ACK or UCI based on the HARQ-ACK state, selecting one for transmission in the uplink subframe if the HARQ-ACK state is DTX or NACK, allowing UCI to be transmitted only when the HARQ-ACK state is favorable, thereby optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ-ACK is prioritized over UCI for simultaneous transmission, then HARQ-ACK reliability is improved, but UCI transmission is dropped and uplink data transmission efficiency deteriorates
Solution Approach 1:
The patent applies dynamics by making the transmission priority adaptive rather than fixed. The UE dynamically switches between prioritizing HARQ-ACK and prioritizing UCI based on the HARQ-ACK state (ACK, NACK, or DTX). When HARQ-ACK is ACK, UCI is transmitted; when NACK or DTX, HARQ-ACK is transmitted. This dynamic adaptation resolves the contradiction by allowing the system to optimize for reliability when needed and for efficiency when possible.
Solution Approach 2:
The patent changes the transmission parameter (which signal to prioritize) based on the HARQ-ACK state parameter. By monitoring the HARQ-ACK state and adjusting the transmission priority accordingly, the system transitions between different transmission modes. This parameter-based control allows the system to resolve the contradiction by selecting the appropriate transmission priority based on current channel conditions and data state.
2Loss of information
If UCI is transmitted simultaneously with HARQ-ACK, then uplink control information completeness is improved, but transmission resource conflict increases and causes efficiency loss
Solution Approach 1:
The patent resolves this contradiction by dynamically selecting which signal to transmit based on the HARQ-ACK state. Instead of always transmitting both signals (which causes resource conflicts) or always prioritizing one (which loses information), the system adapts its transmission behavior. When HARQ-ACK is ACK, UCI is transmitted to maintain information completeness; when NACK or DTX, HARQ-ACK is transmitted to avoid resource conflicts and energy waste.
Data Source
AI summary
Provided are a method and apparatus for transmitting uplink data. The method for transmitting data in a uplink subframe comprises the steps of: determining whether or not a hybrid automatic retransmission request-acknowledgement (HARQ-ACK) and uplink control information (UCI) are being simultaneously transmitted in the uplink subframe; selecting either the HARQ-ACK or UCI on the basis of the HARQ-ACK state for HARQ-ACK upon the occurrence of simultaneous transmission; and transmitting the selected HARQ-ACK or UCI in the uplink subframe.