Rate-Matching Control for Secondary Sidelink SCI in NR V2X
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The performance of secondary sidelink control information (SCI) decreases when a TX UE maps the SCI to not fill all resource elements (REs) on a specific symbol in a resource block (RB), leading to inefficiencies in sidelink communication.
Innovation Solution
A method for efficiently transmitting secondary sidelink control information (SCI) involves obtaining bits by attaching cyclic redundancy check (CRC) bits to initial bits, performing channel coding, and determining the number of modulation symbols based on various parameters. The method also includes rate matching for the coded bits based on the number of modulation symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the TX UE maps the secondary SCI to not fill all resource elements (REs) on a specific symbol in a resource block (RB), then the resource utilization is reduced, but the detection performance of the secondary SCI is improved
Solution Approach 1:
The patent changes the mapping parameters of secondary SCI by introducing a gamma value that adjusts the number of modulation symbols. This allows the system to optimize the balance between detection performance and resource utilization by dynamically adjusting the mapping density based on channel conditions and traffic requirements, rather than using fixed mapping rules
Solution Approach 2:
The patent makes the secondary SCI mapping dynamic by allowing the number of modulation symbols to be adjusted based on the gamma value and other parameters. This dynamic adjustment enables the system to adapt to varying channel conditions and traffic patterns, improving both detection performance and resource efficiency under different operating scenarios
2Reliability
If the number of modulation symbols for secondary SCI is increased to improve detection performance, then the resource consumption increases, but the transmission reliability is improved
Solution Approach 1:
The patent introduces multiple parameters (alpha, beta offset, gamma) to control the number of modulation symbols for secondary SCI. These parameters allow fine-grained adjustment of resource allocation, enabling the system to achieve reliable transmission with optimized resource consumption by changing the mapping parameters based on channel quality and traffic requirements
Data Source
AI summary
A first device performs wireless communication by performing operations that include: attaching cyclic redundancy check (CRC) bits to first bits related to second sidelink control information (SCI), thereby acquiring second bits; acquiring third bits based on channel coding regarding the second bits; acquiring the number of first modulation symbols related to the second SCI acquiring the number of second modulation symbols related to the second SCI by adding a gamma value to the number of the first modulation symbols based on the number of at least one resource element (RE), to which the first modulation symbols are not mapped, among multiple REs on a symbol, to which the last modulation symbol among the first modulation symbols is mapped, within a resource block (RB) to which the last modulation symbol belongs; and performing rate matching regarding the third bits based on the second modulation symbols.