Transport Block Segmentation for Flexible Uplink Scheduling
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Solution Overview
Problem
Current systems for transmitting transport blocks in New Radio (NR) networks face challenges in efficiently managing slot availability and unavailability for uplink transmission, leading to suboptimal performance in hybrid automatic repeat request (HARQ) processes.
Innovation Solution
The system segments transport blocks into segments and transmits them in available slots, with subsequent segments transmitted in subsequent sets of slots based on received grants, allowing for flexible scheduling and resource allocation across multiple slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transport block is transmitted over multiple consecutive slots with repeated grants, then the reliability of transmission is improved, but the complexity of managing slot availability and HARQ processes increases
Solution Approach 1:
The transport block is divided into multiple codeblock groups (CBGs), where each CBG can be independently transmitted and acknowledged. This segmentation allows the system to improve reliability by transmitting critical segments in available slots while managing complexity by handling smaller, independent units rather than managing the entire transport block as one unit across multiple slots.
2Productivity
If the transport block is segmented and transmitted in available slots, then the productivity of slot utilization is improved, but the device complexity for segmentation and scheduling increases
Solution Approach 1:
The transport block is pre-segmented into codeblock groups before transmission, and the system determines availability of slots in advance. This preliminary segmentation and availability assessment enables efficient slot utilization by pre-planning which CBGs can be transmitted in which available slots, reducing the complexity of real-time scheduling decisions.
Solution Approach 2:
The system dynamically adjusts the transmission schedule based on determined slot availability. Rather than following a fixed transmission pattern, the scheduling adapts to actual slot conditions, allocating CBGs to available slots flexibly. This dynamic approach improves slot utilization efficiency while managing complexity through adaptive rather than rigid scheduling rules.
Data Source
AI summary
Systems methods and devices for transmitting a transport block (TB) over multiple slots. A first grant associated with a hybrid automatic repeat request (HARQ) process in a first set of slots is received. A first subset of the first set of slots is determined to be available, and a second subset of the first set of slots is determined to be unavailable, for uplink transmission. The TB is segmented into a first segment and a second segment in response to the determination. The first segment is transmitted in the first subset of the first set of slots. A second grant associated with the HARQ process is received to transmit the TB in a second set of slots. The second segment of the TB is transmitted in the second set of slots.