Adaptive Transport Block Sizing for Long-Delay Wireless Links
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Solution Overview
Problem
Non-terrestrial communication systems face significant retransmission overheads due to large transmission delays, which are not effectively managed by current hybrid automatic repeat request (HARQ) processes, leading to inefficiencies and increased signaling and power consumption.
Innovation Solution
Adaptive adjustment of transport block size based on channel transmission quality and delay, along with selective enabling or disabling of HARQ processes, to optimize data transmission and reduce retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ process is enabled in non-terrestrial communication systems, then data transmission reliability is improved, but retransmission overhead increases significantly
Solution Approach 1:
The patent dynamically adjusts the transport block size parameter based on channel transmission quality and delay characteristics. By changing the parameter (transport block size) according to channel conditions, the system achieves reliable transmission without excessive retransmissions, as larger blocks reduce the frequency of retransmission events while maintaining overall data integrity
Solution Approach 2:
The system transitions from static HARQ configuration to dynamic adaptation where transport block size varies with channel conditions. This dynamic approach allows the system to optimize between reliability and retransmission overhead by adjusting parameters in real-time based on transmission quality and delay feedback
2Loss of energy
If transport block size is increased to reduce retransmission frequency, then retransmission overhead is reduced, but channel transmission quality requirements increase
Solution Approach 1:
The patent implements dynamic parameter adjustment where transport block size is changed based on measured channel transmission quality. When channel quality is good, larger blocks are used to reduce retransmissions; when quality degrades, smaller blocks are used to ensure successful transmission, thus balancing retransmission overhead against transmission quality requirements
3Productivity
If adaptive transport block sizing is implemented based on channel quality and delay, then spectrum efficiency is improved, but device complexity increases
Solution Approach 1:
The system implements adaptive parameter adjustment for transport block sizing based on channel quality and delay measurements. This parameter change approach improves spectrum efficiency by optimizing transmission parameters to match actual channel conditions, reducing waste from failed transmissions while the complexity is managed through standardized measurement and adjustment procedures
Solution Approach 2:
The patent employs feedback mechanisms where channel transmission quality and delay are measured, and this information is used to adjust transport block size. The feedback loop enables spectrum efficiency improvement through continuous optimization while keeping device complexity manageable by using established measurement and control procedures
4Loss of energy
If HARQ process is disabled to reduce overhead, then retransmission overhead is reduced, but data transmission reliability deteriorates
Solution Approach 1:
The patent changes the transport block size parameter adaptively based on channel conditions to achieve reliable transmission without requiring HARQ retransmission mechanisms. By optimizing the block size parameter, the system achieves sufficient reliability through fewer, larger successful transmissions rather than multiple smaller retransmissions
Data Source
AI summary
The present application provides a wireless communication method. One example method includes: sending, by a first device, a first transport block, where a size of the first transport block is determined based on a product of an initial size of the first transport block and a first parameter, the first parameter is determined based on one or more of the following parameters: a second parameter that indicates channel transmission quality corresponding to the first transport block; or a third parameter that indicates a channel transmission delay corresponding to the first transport block.