Code Block Group Retransmission for Wireless Data Efficiency
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Solution Overview
Problem
In existing LTE communication systems, when a transport block exceeds a certain size, the entire block is retransmitted even if only a few code blocks fail to be decoded, leading to inefficient resource utilization due to the lack of granularity in retransmission control, particularly in next-generation radio access technologies like NR that employ wider system bandwidths.
Innovation Solution
The method involves a UE receiving data in a wireless communication system using code block or code block group-based retransmission, where the BS transmits acknowledgement/negative acknowledgement information for each code block group, allowing for more precise control over retransmissions by distinguishing between transport block-based and code block group-based scheduling through specific DCI configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If transport block-based retransmission is used in NR with wider system bandwidth, then the system can support larger data sizes, but resource utilization efficiency deteriorates when only small portions of data fail to be decoded
Solution Approach 1:
The transport block is segmented into multiple code block groups (CBGs), allowing the system to retransmit only the failed CBGs rather than the entire transport block. This segmentation enables granular error recovery, improving resource utilization efficiency while maintaining support for large data sizes in NR's wider system bandwidth.
2Ease of manufacture
If transport block-based retransmission is used, then the retransmission control is simple to implement, but the granularity of retransmission control is insufficient leading to resource waste
Solution Approach 1:
The transport block is divided into multiple code block groups (CBGs) that can be independently acknowledged and retransmitted. This segmentation provides fine-grained control over retransmissions, allowing the system to retransmit only the specific failed CBGs rather than entire transport blocks, thereby improving resource utilization efficiency while maintaining reasonable implementation complexity.
Solution Approach 2:
The system implements CBG-level ACK/NACK feedback mechanisms, where the receiver provides detailed acknowledgment information for each code block group. This feedback enables the transmitter to identify and retransmit only the specific failed CBGs, improving resource utilization efficiency through precise error localization and targeted retransmission.
Data Source
AI summary
A method by which a terminal receives data in a wireless communication system and a device using the method are provided. The method is characterized by receiving first data in a unit of transport block, the transport block including at least one code block, transmitting acknowledgement/negative-acknowledgement (ACK/NACK) information for each code block, of which there is at least one, and receiving, in a unit of code block, second data included in a code block, for which NACK has been transmitted, among code blocks, of which there is at least one.