HARQ Feedback Codebook Grouping for 5G Signaling Overhead
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing HARQ feedback mechanisms in 5G networks face challenges in managing varying numbers of code block groups (CBGs) across different component carriers (CCs), leading to increased signaling overhead and inefficient feedback information volume, particularly when the number of CBGs in a transmission block (TB) exceeds 32.
Innovation Solution
Grouping component carriers according to a binding rule, calculating parameter values for each group, and generating and feeding back HARQ codebooks corresponding to these groups to optimize feedback information volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple HARQ codebooks are fed back for each CC to accurately track CBG retransmission status, then retransmission accuracy is improved, but feedback information volume and signaling overhead increase significantly
Solution Approach 1:
The patent segments the feedback mechanism by introducing a two-type codebook structure: Type 1 codebook provides comprehensive CBG-level retransmission status for each CC, while Type 2 codebook provides aggregated TB-level retransmission status. This segmentation allows the system to selectively use detailed or summary feedback based on actual needs, reducing overall feedback volume while maintaining necessary accuracy.
Solution Approach 2:
Instead of always providing full CBG-level feedback for every CC (excessive action), the patent enables partial feedback by allowing Type 2 codebooks that provide aggregated TB-level status. This partial action approach reduces feedback overhead when full granularity is not required, while still maintaining the capability to provide detailed feedback when needed.
2Productivity
If the number of CBGs in TB increases to 32 to improve data transmission capacity, then transmission efficiency is improved, but the number of required HARQ codebooks increases to 32, increasing signaling overhead
Solution Approach 1:
The patent merges multiple individual CBG-level codebooks into aggregated TB-level codebooks (Type 2). Instead of managing 32 separate codebooks for 32 CBGs, the system can use a single Type 2 codebook that provides aggregated retransmission status at the TB level, significantly reducing codebook management complexity while supporting high CBG counts.
Solution Approach 2:
The patent provides a scalable feedback mechanism where the granularity of feedback can be adjusted. For systems with many CBGs per TB, the system can use aggregated Type 2 codebooks rather than individual CBG-level codebooks, reducing the effective number of feedback units from 32 to a smaller number of aggregated TB-level indicators.
3Productivity
If CBG-level retransmission feedback is used instead of TB-level feedback to improve retransmission efficiency, then retransmission efficiency is improved, but feedback information volume increases
Solution Approach 1:
The patent segments the feedback granularity into two levels: Type 1 codebooks provide CBG-level segmentation for efficient retransmission of individual code blocks, while Type 2 codebooks provide TB-level aggregation to reduce overall feedback volume. This dual-level segmentation allows the system to balance retransmission efficiency with feedback overhead.
Solution Approach 2:
The patent introduces dynamic feedback granularity where the system can adaptively switch between CBG-level (Type 1) and TB-level (Type 2) feedback granularity based on channel conditions, traffic patterns, and retransmission needs. This dynamic adjustment allows the system to use fine-grained CBG feedback when efficiency is critical and coarse-grained TB feedback when overhead reduction is prioritized.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present disclosure relates to a HARQ feedback method and device, a method and device for determining data to be retransmitted, a data receiving apparatus, a data sending apparatus and a computer-readable storage medium. The HARQ feedback method includes: grouping component carriers (CCs) according to a binding rule which includes the number of resource units in the CCs that can be bound into a group; calculating a parameter value of each CC group; generating the same number of HARQ codebooks as that of CC groups, a length of one of the HARQ codebooks being determined by a parameter value of a corresponding CC group and the maximum number of resource units in a single CC in the corresponding CC group; and feeding the HARQ codebooks back to a data sender. In embodiments of the present disclosure, the volume of feedback information is optimized and reduced by grouping CCs according to a binding rule, calculating a parameter value of each CC group, and generating the same quantity of HARQ codebooks as the CC groups.