HARQ Feedback Disabling Control for Low-Latency NTN Links
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Solution Overview
Problem
The existing methods for hybrid automatic repeat request (HARQ) feedback disabling are not sufficiently studied, leading to insufficient number of HARQ processes, which can result in inadequate communication quality, particularly in low latency and non-terrestrial network scenarios.
Innovation Solution
A terminal device configured to receive and recognize HARQ feedback disabling information set for each cell, beam, component carrier, bandwidth part, user equipment, or HARQ process, enabling dynamic control of HARQ feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of HARQ processes is increased to handle low latency and NTN scenarios, then communication quality and reliability are improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent implements dynamic HARQ feedback disabling where the terminal device determines whether to disable HARQ feedback based on current communication conditions, data characteristics, and buffer status. This dynamic approach allows the system to adaptively adjust HARQ process usage, maintaining high reliability when needed while reducing complexity when HARQ feedback can be disabled, thus resolving the contradiction between communication quality and device complexity
Solution Approach 2:
The patent changes the operational parameters of HARQ processes by introducing disabling conditions based on data size thresholds, buffer status, and communication scenario types. By parameterizing the decision to disable HARQ feedback, the system can flexibly control the number of active HARQ processes, improving reliability when parameters indicate need while reducing complexity when parameters allow simplification
2Quantity of substance
If HARQ feedback is disabled to resolve HARQ process insufficiency, then the number of available HARQ processes increases, but error correction capability and communication reliability deteriorate
Solution Approach 1:
The patent segments the decision to disable HARQ feedback into specific conditions and scenarios rather than applying it globally. By segmenting based on data size, buffer status, and communication type, the system preserves error correction capability through HARQ feedback when conditions are favorable while disabling it only when necessary to free up HARQ processes, thus resolving the contradiction between quantity of processes and reliability
Solution Approach 2:
The patent applies partial disabling of HARQ feedback only when specific conditions are met (e.g., small data size, sufficient buffer space, specific communication scenarios) rather than complete disabling. This partial action approach maintains error correction capability for critical communications while freeing enough HARQ processes to handle low latency and NTN requirements, resolving the contradiction between process quantity and reliability
3Productivity
If HARQ processing is performed in parallel for multiple processes, then data throughput increases, but the processing time for each individual HARQ process increases due to resource sharing
Solution Approach 1:
The patent implements periodic evaluation of HARQ feedback necessity based on communication patterns and data characteristics. By periodically assessing whether HARQ feedback should be disabled based on current conditions, the system optimizes the balance between parallel processing throughput and individual process timing, ensuring that HARQ processing time remains acceptable while maintaining high overall productivity through selective feedback disabling
Data Source
AI summary
A terminal device includes a communication unit and a control unit. The control unit is configured to receive disabling information of hybrid automatic repeat request (HARQ) feedback via the communication unit, and recognize that one or more pieces of HARQ feedback indicated by the disabling information of the HARQ feedback are disabled, and the disabling information of the HARQ feedback is set for each cell, each beam, each component carrier, each bandwidth part (BWP), each user equipment (UE), or each HARQ process.