Code Block Group Feedback for Wireless Resource Efficiency
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Solution Overview
Problem
In wireless communication networks, especially at high carrier frequencies, the current HARQ-ACK feedback mechanisms lead to performance degradation due to excessive resource usage for retransmissions, particularly when eMBB transmission is preempted by or collides with URLLC, and the existing code block segmentation methods result in inefficient resource utilization.
Innovation Solution
Implementing a method where multiple code blocks are grouped into code block groups, allowing a single HARQ-ACK bit to represent the group, reducing feedback overhead and optimizing resource allocation by using mini-slots within a slot for retransmissions and new data transmissions, thereby improving resource utilization efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If code block segmentation is applied to transport blocks larger than maximum code block size, then the transport block can be decoded independently with early detection capability, but the feedback overhead increases significantly when one HARQ-ACK bit corresponds to one code block
Solution Approach 1:
Multiple code blocks are grouped into code block groups (CBGs), and a single HARQ-ACK bit is used to represent the group. This merging approach reduces the number of feedback bits required while maintaining the ability to independently decode and provide early detection for each code block within the group.
2Reliability
If a NACK is reported for a transport block with multiple code blocks, then the transmitter retransmits the entire transport block, but this leads to significant resource wastage when only one code block is incorrectly decoded
Solution Approach 1:
The transport block is segmented into code block groups (CBGs) instead of treating it as a single unit. This segmentation allows the receiver to identify and request retransmission of only the specific CBG that contains errors, rather than retransmitting the entire transport block, thereby reducing retransmission resource consumption.
Solution Approach 2:
The system implements granular feedback at the code block group level, where each CBG can be independently acknowledged or negatively acknowledged. This enables precise feedback that triggers selective retransmission of only the failed CBGs, optimizing resource usage compared to all-or-nothing retransmission of the entire transport block.
3Speed
If eMBB transmission is preempted by or collides with URLLC, then URLLC low-latency requirements are met, but performance degradation occurs due to excessive resource usage for retransmissions
Solution Approach 1:
By segmenting the transport block into code block groups, the system enables selective retransmission of only the affected CBGs after URLLC preemption. This reduces the total resource consumption for retransmissions compared to retransmitting the entire transport block, thereby improving overall energy efficiency while maintaining the ability to meet URLLC low-latency requirements.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for transmitting and/or receiving an indication of a portion of a time interval. One apparatus (200) includes a receiver (212) that: receives (902) a signal in a first transmission time interval indicating associated information of a second transmission time interval, wherein the second transmission time interval is a portion of the first transmission time interval; and receives (904) first data in the first transmission time interval and second data in the second transmission time interval.