Non-Terrestrial HARQ Feedback for Lower Data Transmission Delay
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Solution Overview
Problem
The conventional HARQ technology is not suitable for non-terrestrial communications systems like satellite communications due to excessive transmission delays and the resulting increase in the number of HARQ threads, leading to low throughput and high storage and processing requirements for UE.
Innovation Solution
A data transmission method that evaluates channel quality at the receive end to determine when to send feedback, using acknowledgment or negative acknowledgment information to manage HARQ processes, thereby reducing transmission delays and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional HARQ technology is applied to non-terrestrial communications systems, then data retransmission reliability is improved, but transmission delay increases and throughput decreases
Solution Approach 1:
The patent applies preliminary action by having the receive end evaluate channel quality in advance and send feedback information before the transmit end completes data transmission. This allows the transmit end to pre-determine retransmission decisions, reducing the overall transmission delay while maintaining reliability through early channel quality assessment and proactive feedback mechanisms.
2Reliability
If conventional HARQ technology is applied to non-terrestrial communications systems, then data retransmission reliability is improved, but the quantity of HARQ threads increases excessively
Solution Approach 1:
The patent implements feedback by having the receive end evaluate channel quality and send feedback information to the transmit end. This feedback mechanism allows the transmit end to make informed retransmission decisions based on actual channel conditions, reducing the need for excessive HARQ threads while maintaining data retransmission reliability through intelligent, feedback-driven resource management.
3Reliability
If conventional HARQ technology is applied to non-terrestrial communications systems, then data retransmission reliability is improved, but storage capability and data processing capability requirements for UE increase
Solution Approach 1:
The patent applies self-service by enabling the receive end to autonomously evaluate channel quality and generate feedback information without requiring complex processing at the UE. This shifts the intelligence to the receive end, reducing storage and processing requirements at the UE while maintaining reliability through distributed intelligence and simplified UE functionality.
4Productivity
If channel quality evaluation and early feedback mechanism are implemented, then transmission delay is reduced and throughput is improved, but feedback mechanism complexity increases
Solution Approach 1:
The patent reduces feedback mechanism complexity by implementing preliminary channel quality evaluation at the receive end, allowing feedback to be generated based on pre-assessed channel conditions rather than requiring complex real-time analysis. This preliminary assessment simplifies the feedback generation process while enabling early feedback transmission, improving throughput without excessive complexity increase.
Data Source
AI summary
Embodiments of this application provide a data transmission method and related device. The method includes: A receive end receives data from a transmit end; and sends a first response message to the transmit end at a triggering moment of a first preset condition. The first response message comprises acknowledgement (ACK) or negative acknowledgement (NACK) determined based on a channel quality evaluation result obtained by the receive end after evaluating channel quality of a first channel of the transmit end. The first response message is used by the transmit end to determine, based on the ACK or NACK carried in the first response message, whether to resend the data. The receive end may estimate the channel quality in advance, to predetermine a data receiving status before the data is actually received, and return the channel quality to the transmit end at preset moments. This effectively shortens a data transmission delay.