Configured Grant HARQ-ACK Feedback for Uplink Retransmission
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Solution Overview
Problem
The existing 3GPP NR specifications lack comprehensive methods for efficient feedback of uplink data transmission, particularly in scenarios involving configured grant transmissions and retransmission control without explicit HARQ-ACK information, which can lead to inefficiencies and resource wastage.
Innovation Solution
A base station and terminal configuration that determines a transmission method for feedback information, including HARQ-ACK, based on configured grant types, allowing for efficient allocation and transmission of HARQ-ACK information, and optimizing resource usage through methods such as RNTI-based differentiation and identification bit allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ-ACK information is transmitted for all configured grant types, then feedback completeness is improved, but resource wastage increases due to unnecessary feedback transmission
Solution Approach 1:
The patent applies local quality by differentiating feedback transmission based on the specific characteristics of each configured grant type. Instead of uniformly transmitting HARQ-ACK for all grant types, the system transmits feedback only when necessary (e.g., when downlink retransmission is expected), thereby optimizing resource usage while maintaining feedback completeness where needed.
Solution Approach 2:
The patent changes the parameter of feedback transmission behavior based on grant type configuration. By adjusting whether HARQ-ACK is transmitted or not, and modifying the associated indication information, the system adapts to different operational scenarios, reducing unnecessary feedback transmission while maintaining reliability when required.
2Device complexity
If feedback transmission method is simplified, then device complexity is reduced, but feedback efficiency deteriorates
Solution Approach 1:
The patent introduces dynamics by making the feedback transmission method adaptable rather than fixed. The base station dynamically determines whether to transmit HARQ-ACK and what indication information to include, based on the configured grant type and downlink retransmission expectations. This dynamic approach maintains simplicity in the basic mechanism while achieving high feedback efficiency through intelligent adaptation.
3Device complexity
If HARQ-ACK bit allocation is fixed, then device complexity is reduced, but resource allocation efficiency deteriorates
Solution Approach 1:
The patent applies dynamics to HARQ-ACK bit allocation by making it variable based on grant type configuration. Instead of using a fixed allocation scheme, the system adjusts the number of HARQ-ACK bits according to whether the grant is type 1 or type 2, and based on downlink retransmission expectations. This dynamic bit allocation optimizes resource efficiency while maintaining manageable complexity through configuration-based control.
Data Source
AI summary
Provided is a base station that performs feedback with regard to data transmission. The base station includes a downlink feedback information (DFI) generation unit and a transmitter. On the basis of a resource allocation configuration that was configured by a terminal, the DFI generation unit determines a transmission method for feedback information that includes a response signal regarding uplink data. The transmitter transmits the feedback information on the basis of the transmission method.