Integrated Circuit Feedback Signaling for Configured Grant Retransmissions
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Solution Overview
Problem
The existing 3GPP NR specifications lack comprehensive methods for efficient feedback in 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 and transmits feedback information, such as DFI, based on Configured grant types, optimizing the number of HARQ-ACK bits and using different identifiers or identification bits to manage resource allocation efficiently, thereby reducing unnecessary resource usage and improving feedback accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If comprehensive feedback methods are implemented for all uplink data transmission scenarios, then feedback accuracy and retransmission control reliability are improved, but device complexity and implementation overhead increase
Solution Approach 1:
The patent segments the feedback mechanism by distinguishing between Configured grant Type 1 and Type 2 transmissions, applying different feedback methods to each type. This segmentation allows the system to maintain high reliability for retransmission control while reducing overall complexity by not implementing all possible feedback methods for all transmission types.
Solution Approach 2:
The patent implements dynamic feedback mechanisms where the base station determines transmission methods based on configured resource allocation parameters. The feedback approach adapts dynamically between explicit HARQ-ACK for Type 1 and implicit feedback for Type 2, optimizing the balance between reliability and complexity based on actual transmission conditions.
2Measurement precision
If explicit HARQ-ACK information is transmitted for all uplink data, then feedback precision is improved, but loss of time and resource wastage increase
Solution Approach 1:
The patent extracts the explicit HARQ-ACK feedback mechanism specifically for Configured grant Type 1 transmissions where precision is critical, while omitting it for Type 2 transmissions where time efficiency is prioritized. This selective extraction allows the system to maintain high feedback precision where needed while reducing time loss and resource wastage in other scenarios.
Solution Approach 2:
The patent changes the feedback parameter from explicit HARQ-ACK bits to implicit feedback mechanisms based on the configured grant type. This parameter change allows the system to adjust feedback precision levels dynamically, using more precise feedback when necessary and more time-efficient feedback when acceptable.
3Productivity
If resource allocation is optimized for specific grant types, then productivity of feedback transmission is improved, but adaptability to different transmission configurations decreases
Solution Approach 1:
The patent implements a universal feedback determination mechanism at the base station that can handle both Configured grant Type 1 and Type 2 transmissions using a single decision framework. This multi-functionality allows the system to maintain high productivity for specific grant types while preserving adaptability to different transmission configurations through a unified control approach.
Data Source
AI summary
Disclosed is an integrated circuit including transmission circuitry and reception circuitry. The transmission circuitry, in operation, controls transmitting feedback information from a base station on a user equipment (UE) specific physical downlink control channel (PDCCH), the feedback information including a response signal for uplink data. The reception circuitry, in operation, controls a receiving a retransmission determined based on the feedback information and information of a configured grant transmission. The feedback information indicates hybrid automatic repeat request acknowledgement (HARQ-ACK) information for each hybrid automatic repeat request (HARQ) process by using a bitmap.