Terminal Retransmission Control via Code Block Groups
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Solution Overview
Problem
Current 5G mobile communication systems face inefficiencies in retransmission control for downlink transmissions, particularly in New Radio (NR) systems, where the existing methods do not effectively manage retransmissions for multiple Transport Blocks (TBs) scheduled in units of Code Block Groups (CBGs), leading to suboptimal power consumption and transmission efficiency.
Innovation Solution
Implementing a terminal and base station configuration that executes retransmission control for multiple TBs in units of CBGs, allowing for efficient communication by determining the number of CBs within each CBG based on the number of assigned TBs and CBGs, and using HARQ process numbers, NDI, RV, CBGTI, and CBGFI to manage retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If retransmission control is performed for multiple transport blocks in units of code block groups, then transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The patent divides transport blocks into multiple code block groups (CBGs), where each CBG contains one or more code blocks. This segmentation allows selective retransmission of individual CBGs that contain errors, rather than retransmitting entire transport blocks. The control circuitry manages multiple HARQ processes for different CBGs independently, enabling fine-grained error correction and improving transmission efficiency while maintaining manageable complexity through structured organization.
2Use of energy by moving object
If the number of code blocks per code block group is increased, then power consumption is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent introduces dynamic configurability of the number of code blocks per code block group through higher-layer parameters. The system can adaptively adjust CBG sizes based on channel conditions, transport block sizes, and error rates. When channel conditions are good, larger CBGs reduce overhead and power consumption. When error rates increase, smaller CBGs provide better granularity for error detection and correction, maintaining measurement precision. This dynamic adjustment resolves the contradiction between power efficiency and precision.
Data Source
AI summary
The present disclosure is directed to downlink retransmission control. A terminal includes a control circuit that performs retransmission control for a plurality of transport blocks in units of code block groups including at least one code block, and a communication circuit that performs communication according to the retransmission control.