Non-Terrestrial Data Transmission Channel State Feedback
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Solution Overview
Problem
Non-terrestrial communication systems, such as satellite communication, face significant communication delays and reduced throughput due to the long communication distance and high propagation losses, which are exacerbated by conventional retransmission technologies like HARQ that rely on stop-and-wait protocols.
Innovation Solution
A data transmission method where the receiving end feeds back channel state information to the transmitting end, allowing for dynamic scheduling of transmission resources and enabling advanced retransmission decisions without waiting for ACK/NACK feedback, thereby reducing communication delay and improving throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional HARQ retransmission technology is used in non-terrestrial communication, then data transmission reliability is improved, but communication delay increases and throughput is reduced
Solution Approach 1:
The patent applies preliminary action by having the receiving end feed back channel state information to the transmitting end before data transmission occurs. This allows the transmitting end to pre-determine the appropriate transmission mode (retransmission or aggregation transmission) based on predicted channel conditions, eliminating the need to wait for ACK/NACK feedback after transmission. The channel state feedback enables proactive decision-making that resolves the contradiction between maintaining reliability and reducing delay.
2Reliability
If conventional HARQ retransmission technology is used in non-terrestrial communication, then data transmission reliability is improved, but system throughput is reduced
Solution Approach 1:
The patent implements dynamics by enabling the transmitting end to dynamically switch between retransmission mode and aggregation transmission mode based on channel state feedback. When channel conditions are good, aggregation transmission can proceed without waiting for retransmission confirmation, thereby increasing system throughput while maintaining reliability through adaptive mode selection.
Solution Approach 2:
By obtaining channel state information in advance and pre-determining transmission modes, the system avoids the stop-and-wait protocol bottleneck, allowing continuous data transmission and improving overall system throughput while maintaining reliable delivery.
3Reliability
If stop-and-wait protocol is used for data transmission, then transmission reliability is improved through confirmation feedback, but communication delay increases due to waiting for ACK/NACK
Solution Approach 1:
The patent introduces a new feedback mechanism where the receiving end feeds back channel state information proactively before transmission. This inverted feedback approach allows the transmitting end to make informed transmission mode decisions in advance, eliminating the need to wait for post-transmission ACK/NACK feedback while maintaining reliability through appropriate mode selection.
Data Source
AI summary
The present disclosure relates to data transmission methods and apparatuses. In one example method, a receiving end obtains a transmission resource, and feeds back first information to a transmitting end based on the transmission resource. The first information is determined based on a channel state of a first channel, and the first information indicates whether retransmission is required or indicates whether a transmission mode is to be adjusted.