Sidelink Resource Mapping for SL PRS and PSSCH Slot Conflicts
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Solution Overview
Problem
The challenge of sending Sidelink Positioning Reference Signals (SL PRS) and Physical Sidelink Shared Channel (PSSCH) in the same slot within the NR-V2X communication system has not been effectively addressed, leading to resource conflicts and reduced positioning accuracy for User Equipment (UE) outside cellular network coverage.
Innovation Solution
The proposed solution involves mapping second-stage Sidelink Control Information (SCI) in the PSSCH to resource units that do not overlap with SL PRS symbols, ensuring that demodulation reference signals (DMRS) of the PSSCH are positioned on specific symbols, and mapping the remaining PSSCH portions without second-stage SCI to non-overlapping resource units, thereby optimizing resource allocation and reducing conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SL PRS and PSSCH share the same resource pool and are transmitted in the same slot, then resource utilization is improved, but resource conflicts occur between SL PRS symbols and PSSCH resource units
Solution Approach 1:
The PSSCH transmission resources are segmented into multiple resource units (RUs) within the slot. The second-stage SCI is mapped to specific RUs that are configured to not overlap with SL PRS symbols, while other PSSCH data can be mapped to remaining RUs. This segmentation allows simultaneous transmission of SL PRS and PSSCH without resource conflicts.
Solution Approach 2:
Different resource units within the PSSCH are assigned different mapping characteristics. Specifically, RUs containing second-stage SCI are configured with quality attributes that prevent overlap with SL PRS symbols, while other RUs can utilize available resources. This local differentiation resolves the resource conflict by applying different mapping rules to different parts of the PSSCH.
2Adaptability or versatility
If second-stage SCI is mapped to resource units that may overlap with SL PRS symbols, then mapping flexibility is improved, but positioning accuracy deteriorates due to resource conflicts
Solution Approach 1:
The system performs preliminary configuration of resource units before mapping the second-stage SCI. Specific RUs are pre-configured with mapping characteristics that ensure they do not overlap with SL PRS symbols. This preliminary action guarantees that positioning reference signals remain intact and accurate, while still allowing flexible mapping of control information to appropriate resource units.
3Productivity
If DMRS of PSSCH is positioned on symbols that overlap with SL PRS symbols, then resource efficiency is improved, but signal interference increases
Solution Approach 1:
The patent extracts or removes the conflict between DMRS and SL PRS by configuring resource units for second-stage SCI mapping that explicitly exclude overlap with SL PRS symbols. The DMRS positioning is adjusted or selected from available RUs that do not conflict with positioning reference signals, thereby eliminating harmful interference while maintaining resource efficiency through optimized RU selection.
Data Source
AI summary
Provided in the embodiments of the present application is a resource mapping method, the method includes that: second-stage sidelink control information (SCI) in a physical sidelink shared channel (PSSCH) is mapped from a first resource unit in a time slot to at least one second resource unit comprising the first resource unit, wherein a demodulation reference signal of the PSSCH is present on a symbol where the first resource unit is located, and the at least one second resource unit does not overlap or partially overlaps with a symbol for transmitting a sidelink positioning reference signal (SL PRS); and a portion of the PSSCH that does not include the second-stage SCI is mapped to at least one third resource unit that does not include the second-stage SCI.