HARQ Codebook Feedback Adaptation for Non-Terrestrial Networks
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Solution Overview
Problem
In non-terrestrial networks (NTN) such as satellite communication systems, the Hybrid Automatic Repeat Request (HARQ) efficiency is reduced due to large Round-Trip Time (RTT), and existing mechanisms for disabling HARQ feedback processes lead to differing opinions among terminal manufacturers regarding HARQ codebook enhancement, resulting in complexity and incompatibility issues.
Innovation Solution
A method for codebook feedback is introduced, where terminals send capability information indicating their HARQ codebook configuration capabilities, and network devices configure HARQ codebook configuration information accordingly, allowing terminals to generate and feed back HARQ codebooks that match their supported capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HARQ codebook enhancement is implemented to reduce codebook size, then uplink transmission efficiency is improved, but terminal complexity increases
Solution Approach 1:
The patent applies local quality by enabling HARQ codebook enhancement only for terminals that support it, while maintaining backward compatibility with terminals that do not support enhancement. The network device configures different codebook types (Type-1, Type-2, Type-3) based on terminal capability, allowing enhanced terminals to use optimized codebooks with reduced size while non-enhanced terminals continue using traditional codebooks.
2Loss of information
If HARQ codebook enhancement is implemented, then redundant information is reduced, but compatibility among different terminal manufacturers deteriorates
Solution Approach 1:
The patent implements dynamics by making the HARQ codebook configuration adaptive to terminal capabilities. The network device dynamically selects and configures appropriate codebook types based on the terminal's enhancement support status. Terminals report their capability information, and the network device responds with corresponding configuration, enabling seamless interoperability between enhanced and non-enhanced terminals without requiring all terminals to support the same codebook type.
3Productivity
If HARQ feedback processes are disabled to improve system efficiency, then feedback overhead is reduced, but HARQ decoding reliability deteriorates
Solution Approach 1:
The patent applies parameter changes by introducing different codebook types (Type-1, Type-2, Type-3) with varying feedback mechanisms. Type-1 codebook provides semi-static feedback for disabled HARQ processes, Type-2 codebook provides dynamic feedback, and Type-3 codebook provides one-shot feedback. The network device can select the appropriate codebook type based on channel conditions and terminal capabilities, thereby adjusting the feedback parameter to balance system efficiency and decoding reliability.
Data Source
AI summary
A method for codebook feedback performed by a terminal, includes: sending capability information, the capability information being used to indicate a HARQ codebook configuration capability, when there are feedback-disabled HARQ processes; acquiring HARQ codebook configuration information configured by a network device for the terminal on the basis of the capability information; and generating a HARQ codebook on the basis of the HARQ codebook configuration information.