V2X Transport Block Size Determination for Sidelink Resource Flexibility
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Solution Overview
Problem
In vehicle-to-everything (V2X) communication systems, the varying number of available symbols in different slots limits the selection of transmission resources and causes transmission delays due to the need for matching transport block sizes between initial and retransmission slots.
Innovation Solution
A method to determine transport block sizes by calculating encoded symbols based on symbol length and a scaling factor, ensuring consistent quantities across slots through preconfiguration or dynamic indication, allowing for consistent resource selection and reducing delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transport block sizes are matched between initial transmission and retransmission slots to ensure combination gain, then transmission reliability is improved, but transmission delay increases due to limited resource selection
Solution Approach 1:
The patent changes the parameter of transport block size determination from being slot-dependent to being determined by a unified formula using available resource elements. By calculating TBS based on the number of available resource elements rather than matching exact slot configurations, the system maintains combination gain while enabling flexible resource selection across different slot types, thereby reducing transmission delay without sacrificing reliability
Solution Approach 2:
The patent introduces dynamic adaptation in TBS calculation by using the actual number of available resource elements in each slot. Instead of requiring static matching of slot configurations, the system dynamically adjusts TBS based on available resources while maintaining consistency through the unified calculation method, allowing flexible resource allocation that reduces delay while preserving combination gain
2Loss of time
If transmission resources are selected flexibly without matching slot configurations, then transmission delay is reduced, but transport block size consistency between initial transmission and retransmission is compromised
Solution Approach 1:
The patent changes the approach from matching slot configurations to using a unified TBS calculation formula based on available resource elements. This parameter change allows flexible resource selection while maintaining TBS consistency through standardized calculation, resolving the contradiction between flexibility and consistency
Solution Approach 2:
The patent creates a universal TBS calculation method that works across different slot configurations. By using a unified formula that adapts to any slot type based on available resource elements, the system achieves both flexible resource selection and consistent TBS determination, making the solution applicable to various transmission scenarios without compromising reliability
Data Source
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AI summary
This application provides a method for determining a transport block size and a communication apparatus, which may be used in systems such as vehicle-to-everything, V2X, and V2V A receive-end terminal device and a transmit-end terminal device may determine a quantity of encoded symbols based on a symbol length used for sidelink communication in a time unit and an scaling factor, and may further determine a transport block size of a data channel based on the quantity of encoded symbols. Therefore, for all slots used for sidelink communication, a same quantity of encoded symbols can be determined, and a same transport block size can be further determined. In this way, initial transmission or retransmission of a transport block can be performed in each slot used for sidelink communication, to avoid a limitation on selection of a transmission resource and a resulting transmission delay.