User Terminal Code Block HARQ Control
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Solution Overview
Problem
In future radio communication systems, the efficiency of radio resource utilization deteriorates due to retransmission control being performed for each transport block, which is inefficient for accommodating various services such as high-speed, large-capacity communication, massive access, and low-latency requirements.
Innovation Solution
A user terminal divides transport blocks into code blocks and controls retransmission of both downlink and uplink signals on a per-code-block or per-code-block-group basis, allowing for more efficient use of radio resources by transmitting acknowledgment or negative acknowledgment information for each code block or code block group.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If retransmission control is performed for each transport block as in existing systems, then the retransmission control mechanism is simple to implement, but the efficiency of radio resource utilization deteriorates
Solution Approach 1:
The patent divides a transport block into multiple code blocks, each with its own HARQ process. This segmentation allows independent retransmission control for each code block, enabling more granular and efficient radio resource utilization while maintaining manageable complexity through modular HARQ processes.
Solution Approach 2:
The patent introduces a new dimension to retransmission control by implementing HARQ processes at the code block level rather than the traditional transport block level. This dimensional change in the control granularity enables more flexible and efficient resource allocation without fundamentally complicating the existing HARQ mechanism.
2Ease of operation
If retransmission control is performed for each transport block, then the control mechanism is straightforward, but it cannot accommodate various services such as high-speed communication, massive access, and low-latency requirements
Solution Approach 1:
By segmenting the transport block into multiple code blocks with independent HARQ processes, the system can selectively retransmit only failed code blocks. This provides the flexibility needed to support diverse services with different requirements (high-speed, massive access, low-latency) while keeping the control mechanism relatively simple through modular design.
Solution Approach 2:
The patent enables dynamic adaptation to different service requirements by allowing independent HARQ processes for each code block. This dynamic control allows the system to adjust retransmission behavior based on service-specific needs, providing versatility while maintaining operational simplicity through standardized procedures.
3Device complexity
If retransmission control is performed per transport block, then the system structure is simple, but the efficiency of radio resource utilization deteriorates due to unnecessary retransmissions
Solution Approach 1:
The patent segments the transport block into multiple code blocks, each handled by a separate HARQ process. This segmentation reduces system complexity by isolating retransmission control to individual code blocks, preventing unnecessary retransmission of successfully received data and thereby improving radio resource utilization efficiency.
Solution Approach 2:
The patent extracts the retransmission control function from the transport block level down to the code block level. This extraction allows independent handling of each code block's retransmission, eliminating wasteful retransmissions of entire transport blocks when only partial data needs retransmission, thus improving resource efficiency without significantly increasing overall system complexity.
Data Source
AI summary
The present invention is designed to improve the efficiency of the use of radio resources in retransmission control in future radio communication systems. A user terminal according to one aspect of the present invention has a receiving section that receives a downlink (DL) signal, and a control section that, when a transport block of the DL signal is divided into a plurality of code blocks, controls transmission of retransmission control information representing an acknowledgment (ACK) or a negative acknowledgment (NACK) for each code block, or representing an ACK or a NACK for each code block group, which groups fewer code blocks than the plurality of code blocks.