Multi-Slot Transport Block Transmission via Segmentation
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Solution Overview
Problem
Current communication technologies face challenges in efficiently transmitting transport blocks (TB) over multiple slots, particularly in New Radio (NR) coverage enhancement, where determining optimal Transport Block Size (TBS) and ensuring power boosting gains and lower coding rates are necessary for improved spectral density and reduced CRC padding.
Innovation Solution
A method where user devices determine the TBS based on available resource elements across multiple slots, segmenting TBs into smaller packets for efficient transmission, and employing specific mapping orders and redundancy versions to enhance transmission performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TB is transmitted over multiple slots, then power boosting gain and lower coding rate are achieved, but TBS determination and resource allocation complexity increase
Solution Approach 1:
The patent segments the Transport Block into multiple Code Block Groups (CBGs) that can be independently transmitted and acknowledged across different slots. This segmentation allows the system to achieve reliable transmission through partial retransmission while simplifying TBS determination by enabling independent handling of each CBG, thus resolving the contradiction between transmission reliability and determination complexity.
Solution Approach 2:
The patent introduces dynamic Redundancy Version (RV) selection and adaptive CBG transmission strategies where the transmission parameters are adjusted based on channel conditions and previous acknowledgment status. This dynamic approach enables the system to optimize power boosting and coding rates adaptively across multiple slots, reducing the overall complexity of TBS determination while maintaining high transmission reliability.
2Productivity
If TB processing is extended over multi-slot, then spectral density is improved, but TDRA and TBS determination become more complex
Solution Approach 1:
By segmenting the TB into CBGs that can be independently scheduled and transmitted across slots, the patent simplifies Time-Domain Resource Allocation (TDRA) while maintaining high spectral density. Each CBG can be allocated to specific slots based on channel conditions, avoiding the need for complex multi-slot TB processing and reducing TDRA complexity.
Solution Approach 2:
The patent changes the parameter perspective by treating each CBG as an independent transmission unit with its own TBS determination, rather than processing the entire TB as a single unit across multiple slots. This parameter change simplifies TDRA and TBS determination while still achieving improved spectral density through efficient multi-slot utilization.
3Loss of substance
If multi-slot transmission is implemented, then CRC padding is reduced, but phase continuity and power consistency requirements increase
Solution Approach 1:
The patent segments the TB into CBGs with individual CRC checks, allowing each segment to be independently transmitted and acknowledged. This segmentation reduces overall CRC padding overhead since each CBG has its own compact CRC rather than requiring extensive CRC for the entire TB across multiple slots. The segmentation also simplifies phase continuity requirements by enabling independent processing of each CBG.
Solution Approach 2:
The patent introduces CBG-level acknowledgment and retransmission mechanisms as intermediaries between the transmitter and receiver. This intermediary layer reduces the need for extensive CRC padding by enabling efficient error detection and selective retransmission at the CBG level, while also simplifying phase continuity management through structured retransmission protocols.
Data Source
AI summary
Example embodiments of the present disclosure relate to methods, devices, apparatuses and computer readable storage media for multi-slot transmission of a transport block (TB). In example embodiments, a user device determines a transport block size (TBS) based on a plurality of slots. The user device transmits a TB with the TBS over the plurality of slots.