PSSCH DMRS Mapping Alignment with PSCCH Resources in NR V2X
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Solution Overview
Problem
In NR-based V2X communication, the detection performance of sidelink communication is deteriorated when the PSSCH DMRS is not mapped correctly in relation to the PSCCH resources, leading to inefficiencies in resource utilization and communication reliability.
Innovation Solution
A method is introduced where a UE selects a synchronization source based on sidelink synchronization priority, transmits a sidelink-synchronization signal block including S-PSS, S-SSS, and PSBCH, and maps the PSSCH DMRS to time resources aligned with the PSCCH, ensuring accurate decoding and transmission of PSSCH DMRS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PSSCH DMRS is not mapped correctly in relation to PSCCH resources, then resource utilization efficiency is improved, but sidelink detection performance deteriorates
Solution Approach 1:
The patent changes the mapping parameters of PSSCH DMRS by introducing a new mapping rule that aligns DMRS positions with PSCCH resource boundaries. Specifically, the DMRS is mapped to specific time-frequency resources relative to the PSCCH start position, using parameters such as offset values and resource block allocations. This parameter adjustment resolves the contradiction by ensuring proper alignment between control channel and data channel reference signals, thereby maintaining detection performance while optimizing resource utilization.
2Device complexity
If PSSCH DMRS mapping is not aligned with PSCCH resources, then device complexity is reduced, but communication reliability deteriorates
Solution Approach 1:
The patent introduces standardized mapping parameters and formulas that define the relationship between PSCCH resources and PSSCH DMRS positions. By establishing clear parameter relationships (such as fixed offsets and resource allocation rules), the patent reduces configuration complexity while ensuring reliable communication. The mapping is defined through specific parameters like starting resource block indices and subcarrier spacing, which simplify the mapping process while maintaining communication reliability.
Data Source
AI summary
A method for performing wireless communication by a first device is proposed in an embodiment. The method may comprise the steps of: selecting a synchronization source on the basis of a sidelink synchronization priority; acquiring synchronization on the basis of the synchronization source; transmitting a sidelink-synchronization signal block (S-SSB) to a second device on the basis of the acquired synchronization; transmitting, to the second device, information related to a pattern of a physical sidelink shared channel (PSSCH) demodulation reference signal (DMRS) for decoding a PSSCH through sidelink control information (SCI) on a physical sidelink control channel (PSCCH); mapping the PSSCH DMRS onto a time resource related to the PSSCH on the basis of the information related to the pattern of the SSCH DMRS and an interval of a time resource scheduled for transmission of the PSSCH related to the PSCCH; and transmitting the PSSCH DMRS to the second device through the PSSCH.