HARQ Feedback Codebook Generation for NR SPS Terminals
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Solution Overview
Problem
In the New Radio (NR) Rel-15 system, the semi-persistent/semi-static transmission period is shortened, leading to high feedback overhead and reduced transmission efficiency due to inconsistent HARQ codebook understanding between the terminal and the base station, especially when multiple sets of SPS transmission parameters are configured, causing incorrect ACK/NACK information.
Innovation Solution
A method and device for determining feedback information by calculating HARQ process indexes based on the time-domain positions of transmission resources and generating a feedback information codebook that associates same HARQ process indexes with a single feedback information bit, reducing uplink feedback overhead and ensuring consistent HARQ codebook understanding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the semi-persistent/semi-static transmission period is shortened, then the transmission responsiveness is improved, but the feedback overhead increases and transmission efficiency decreases
Solution Approach 1:
The patent changes the parameter of HARQ process index calculation from based on transmission resource position to based on SPS configuration index. This parameter change resolves the contradiction by enabling shorter SPS periods without increasing feedback overhead, as the HARQ process index now directly reflects the SPS configuration rather than the transmission timing position.
Solution Approach 2:
The patent introduces the SPS configuration index as an intermediary element to bridge the SPS configuration and HARQ feedback mechanisms. This intermediary allows the system to maintain consistent HARQ codebook understanding even with shortened transmission periods, thereby reducing feedback overhead while preserving transmission responsiveness.
2Adaptability or versatility
If multiple sets of SPS transmission parameters are configured, then the adaptability is improved, but the HARQ codebook understanding consistency deteriorates
Solution Approach 1:
The patent changes the HARQ process index calculation parameter from transmission resource position to SPS configuration index. This ensures that when multiple SPS configurations are active, each configuration maintains a consistent and predictable HARQ process index assignment, thereby preserving codebook consistency while allowing flexible multi-configurations.
Solution Approach 2:
The patent segments the HARQ feedback mechanism into configuration-specific HARQ process indexes. By associating each SPS configuration with its own dedicated HARQ process indexes, the system maintains clear separation and consistent understanding between terminal and base station for each configuration, eliminating ambiguity in multi-config scenarios.
3Productivity
If the existing HARQ codebook design is used with shortened SPS period, then the transmission efficiency is improved, but the feedback overhead increases
Solution Approach 1:
The patent changes the fundamental parameter of HARQ process index assignment from time-position based to configuration-index based. This parameter change enables the terminal to generate a more compact and accurate HARQ codebook for shortened SPS periods, reducing the quantity of feedback information bits required while maintaining or improving transmission efficiency.
Data Source
AI summary
A feedback information determining method and apparatus, and a storage medium. The method comprises: a terminal determines, according to the position of each transmission resource in multiple transmission resources, a HARQ process index corresponding to the transmission resource; the terminal determines a first feedback information codebook according to the HARQ process indexes corresponding to the multiple transmission resources, wherein the first feedback information codebook comprises feedback information corresponding to the multiple transmission resources.