Consistent Sidelink Transport Block Size Across Variable Slot Formats
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently determining transport block sizes (TBS) for sidelink communications, particularly when different instances of sidelink data channel transmissions use slots with varying slot formats, leading to inconsistent TBS determinations that hinder decoding efficiency.
Innovation Solution
The transmitting UE determines a consistent TBS for sidelink data channel transmissions by providing explicit or implicit indications in SCI, based on parameters like PSFCH resource inclusion, MCS index, coding rate, modulation order, or transmission type, ensuring the same TBS is used across slots with different formats, facilitating efficient decoding at the receiving UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different slot formats are used for sidelink data channel transmissions, then resource utilization flexibility is improved, but transport block size determination consistency deteriorates
Solution Approach 1:
The patent applies parameter changes by introducing a new parameter (feedback resource inclusion indicator) in the SCI that explicitly controls whether feedback resources are included when determining the number of symbols for TBS calculation. This allows the TBS determination to remain consistent across different slot formats by providing a standardized parameter that overrides the variability introduced by different slot configurations.
Solution Approach 2:
The patent uses an intermediary approach by introducing the feedback resource inclusion indicator as a mediating parameter between the slot format diversity and TBS determination. This intermediary parameter enables the receiving device to correctly interpret the number of symbols available for data transmission regardless of the specific slot format used, thereby maintaining TBS consistency across varied slot configurations.
2Productivity
If explicit indications are provided in SCI for TBS determination, then decoding efficiency is improved, but control information overhead increases
Solution Approach 1:
The patent extracts only the essential information needed for TBS determination by including a specific feedback resource inclusion indicator in the SCI. Rather than transmitting complete slot format details or multiple redundant parameters, the invention extracts and transmits only the critical indicator that enables the receiving device to correctly determine the TBS, thereby improving decoding efficiency while minimizing overhead.
Solution Approach 2:
The patent applies local quality by providing targeted control information specifically where needed for TBS determination. The feedback resource inclusion indicator is inserted at the appropriate location in the SCI structure, providing localized control over the TBS calculation process without requiring changes to the entire control information framework, thus balancing decoding efficiency with overhead constraints.
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AI summary
Methods, systems, and devices for sidelink wireless communications are described in which a transmitting device may determine a transport block size (TBS) for a sidelink data channel transmission and provide an indication in in sidelink control information (SCI) to allow a receiving device to determine the TBS to be used for decoding the sidelink communication. The indication provided in the SCI may be an explicit indication in an information element that indicates whether feedback channel resources are included or excluded when determining a number of symbols for use in a TBS determination. The indication provided in the SCI may also be an implicit indication based on one or more values of one or more parameters provided in the SCI. The sidelink communications devices may determine a same TBS across multiple instances of a sidelink data channel transmission that may be transmitted using slots having different slot formats.