HARQ Feedback Reduction via Time Window Segmentation
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Solution Overview
Problem
In New Radio (NR) systems operating on unlicensed spectra, the high data transmission bandwidth leads to a significant increase in HARQ information feedback, resulting in high signaling overhead for CG-PUSCH transmission, which is not efficiently managed by existing technologies.
Innovation Solution
A method is introduced where a time window is divided for CG-PUSCH transmission, allowing the network device to perform HARQ-ACK feedback within this window, thereby reducing the quantity of downlink HARQ-ACK feedback and signaling overhead by avoiding full-codebook HARQ-ACK feedback similar to LTE systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full-codebook HARQ-ACK feedback is used for CG-PUSCH transmission on unlicensed spectrum, then complete HARQ information feedback is provided, but signaling overhead increases significantly
Solution Approach 1:
The patent segments the time window into multiple sub-windows and divides HARQ feedback into multiple parts, where each part corresponds to a specific sub-window. This segmentation allows the system to provide complete HARQ feedback information while reducing the signaling overhead by only transmitting feedback for specific time segments rather than requiring full-codebook feedback for the entire window.
2Loss of time
If CG-PUSCH transmission is supported on unlicensed spectrum, then uplink transmission delay is reduced, but HARQ feedback quantity increases
Solution Approach 1:
By segmenting the time window and dividing HARQ feedback into multiple parts corresponding to different sub-windows, the patent reduces the quantity of HARQ feedback transmitted at any single moment while maintaining complete feedback coverage, thus resolving the contradiction between reduced transmission delay and increased feedback quantity.
Solution Approach 2:
The patent implements periodic HARQ feedback transmission where feedback is provided in periodic intervals corresponding to different sub-windows. This periodic action allows the system to maintain efficient uplink transmission while managing the quantity of HARQ feedback through time-based periodic reporting rather than continuous feedback.
Data Source
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AI summary
The embodiments of the present application provide an HARQ information transmission method, a terminal device and a network device. A time window is divided with regard to CG-PUSCH transmission on an unlicensed spectrum and a network device performs HARQ-ACK feedback on the CG-PUSCH transmission in the time window, and thus a downlink HARQ-ACK feedback amount with regard to an uplink PUSCH can be reduced so as to decrease signalling overhead. The method comprises: a network device determining first HARQ information, wherein the first HARQ information comprises at least one piece of HARQ information corresponding to a first PUSCH; and the network device sending, on a first time unit, the first HARQ information to a terminal device.