DMRS Mapping for PSSCH Detection in NR V2X
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, particularly in NR-based V2X scenarios, the detection performance of sidelink communication is deteriorated when the PSSCH DMRS is not mapped correctly in relation to the PSCCH, leading to inefficiencies in resource utilization and communication reliability.
Innovation Solution
A method where a UE transmits sidelink control information including DMRS pattern information and maps the DMRS onto PSSCH resources based on the pattern and symbol duration related to the PSCCH, ensuring accurate DMRS transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PSSCH resources are superimposed on PSCCH resources or surrounded by PSCCH resources to increase resource usage efficiency, then resource utilization efficiency is improved, but PSSCH detection performance deteriorates when DMRS is not correctly mapped
Solution Approach 1:
The patent applies preliminary action by determining the DMRS pattern and mapping DMRS to PSSCH resources before actual data transmission. The transmitting UE determines whether to use type 1 or type 2 DMRS pattern based on PSCCH-PSSCH resource relationship, and the receiving UE is notified of this pattern through SCI. This advance preparation ensures that the receiving UE can correctly detect PSSCH even when PSCCH and PSSCH resources are superimposed or adjacent, thus maintaining detection performance while achieving efficient resource utilization.
2Reliability
If DMRS pattern information is transmitted through SCI to enable correct DMRS mapping, then PSSCH detection performance is improved, but communication overhead increases
Solution Approach 1:
The patent applies universality by making the SCI serve multiple functions: it carries both the traditional sidelink control information and the DMRS pattern indication. By reusing the existing SCI structure to convey DMRS pattern information (indicating whether type 1 or type 2 pattern is used), the patent avoids introducing separate signaling channels, thus improving PSSCH detection performance while minimizing additional overhead.
3Adaptability or versatility
If the symbol duration of PSCCH is relatively larger than that of downlink CORESET, then PSCCH resource allocation flexibility is improved, but PSSCH detection performance deteriorates without proper DMRS mapping
Solution Approach 1:
The patent applies dynamics by making the DMRS mapping adaptable to different PSCCH-PSSCH resource configurations. The system dynamically selects between type 1 and type 2 DMRS patterns based on the actual resource relationship: type 1 is used when PSCCH and PSSCH are superimposed in frequency domain, while type 2 is used when PSCCH surrounds PSSCH resources. This dynamic adaptation ensures optimal PSSCH detection performance across different resource allocation scenarios while maintaining PSCCH allocation flexibility.
Data Source
AI summary
Proposed is a method for a first device for communicating wirelessly. The method can comprise a step of, from a second device, transmitting sidelink control information (SCI) comprising information relating to a demodulation reference signal (DMRS) pattern by means of a physical sidelink control channel (PSCCH) to the second device, mapping the DMRS on resources relating to a physical sidelink shared channel (PSSCH) on the basis of the information relating to the DMRS pattern and the length of a symbol duration of the PSSCH relating to the PSCCH, and transmitting the DMRS to the second device by means of the PSSCH.