DMRS Sequence Mapping for Overlapping PSCCH and PSSCH Resources
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Solution Overview
Problem
The overlap of resources allocated for Physical Sidelink Control Channel (PSCCH) and Physical Sidelink Shared Channel (PSSCH) in D2D communication networks, such as V2X, causes challenges in the transmission of the reference signal, specifically the DeModulation Reference Signal (DMRS), due to unsuitable mapping types.
Innovation Solution
A new mechanism for the transmission of the reference signal is designed to handle the overlap of PSCCH and PSSCH resources. This involves generating a DMRS sequence based on a scrambling identity derived from the PSCCH, mapping it to intermediate quantities, and precoding it for transmission. The method determines frequency-domain resources based on the number of transmission layers and time-domain resources based on the overlap relationship between PSCCH and PSSCH resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If resources for PSCCH and PSSCH are allocated to overlap, then resource utilization efficiency is improved, but reference signal transmission reliability deteriorates
Solution Approach 1:
The resource allocation is segmented into control region (PSCCH) and data region (PSSCH), with further segmentation of PSSCH into reference signal resources and data resources. This segmentation allows independent optimization of each part, enabling reference signals to be protected from control channel interference while maintaining overall resource utilization efficiency.
Solution Approach 2:
A new reference signal mapping mechanism acts as an intermediary between the overlapping PSCCH/PSSCH resources and the reference signal transmission. This intermediary mechanism dynamically determines reference signal positions based on the actual resource allocation, preventing direct interference from control channels while maintaining efficient resource usage.
2Reliability
If a new reference signal mapping mechanism is designed, then reference signal transmission reliability is improved, but system complexity increases
Solution Approach 1:
The reference signal mapping mechanism is designed to be dynamic rather than static. The reference signal positions and parameters are determined based on the actual PSCCH and PSSCH resource allocation in each transmission instance. This dynamic approach adapts to varying resource conditions without requiring complex pre-configured mapping tables, thus improving reliability while controlling complexity.
Solution Approach 2:
The system changes key parameters of the reference signal (such as time-frequency positions, sequence initialization values) based on the resource allocation parameters. By dynamically adjusting these parameters according to the actual PSCCH/PSSCH overlap configuration, the system achieves reliable reference signal transmission without implementing a completely new complex mapping framework.
Data Source
Figure 1~2B
Figure 2C~2E
Figure 2F~3
AI summary
Embodiments of the present disclosure relate to methods, devices and computer readable mediums for resource selection. The method comprises generating a sequence of a reference signal for Physical Sidelink Shared Channel, PSSCH based on a scrambling identity derived from a Physical Sidelink Control Channel, PSCCH; determining a time-domain resource based on the frequency-domain resource and partially based on an overlap relationship between a first set of resources allocated for the PSCCH and a second set of resources allocated for the PSSCH; and mapping the sequence to the time-domain resource and the frequency-domain resource for transmitting the reference signal. In this way, the reference signal could be transmitted via PSSCH efficiently in a case that the resources allocated for PSCCH is overlapped with the resources allocated for PSSCH.