NR V2X Sidelink Positioning With Overlapping SL PRS and PSFCH
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently supporting sidelink communication for vehicle-to-everything (V2X) scenarios, particularly in next-generation radio access technology (NR), including the transmission of Sidelink Positioning Reference Signals (SL PRS) and Physical Sidelink Feedback Channels (PSFCH), which are crucial for accurate positioning and feedback in V2X communications.
Innovation Solution
A method and apparatus for transmitting SL PRS and PSFCH in NR V2X, involving the reception and transmission of physical sidelink control and shared channels, with overlapping time intervals for SL PRS and PSFCH transmission, utilizing processors and transceivers to determine and manage these channels effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SL PRS and PSFCH are transmitted in overlapping time intervals, then positioning accuracy and feedback reliability are improved, but resource conflict and transmission reliability deteriorate
Solution Approach 1:
The patent segments the overlapping time interval into distinct transmission regions: SL PRS is transmitted in a first time interval while PSFCH is transmitted in a second time interval that overlaps with it. By dividing the transmission into separate resource allocations within the overlap period, the system enables both signals to coexist without mutual interference, resolving the contradiction between achieving positioning accuracy through overlap and maintaining transmission reliability through resource conflict avoidance
Solution Approach 2:
The patent resolves the time-domain conflict by introducing frequency domain separation. SL PRS and PSFCH are allocated to different frequency resources (different physical resource blocks) within the overlapping time interval. This dimensional transition from purely time-based to time-frequency resource allocation allows both signals to be transmitted simultaneously without interference, maintaining both positioning accuracy and feedback reliability
2Reliability
If SL PRS and PSFCH transmission time intervals are separated, then resource conflict is avoided, but transmission efficiency and time resource utilization worsen
Solution Approach 1:
The patent merges the transmission of SL PRS and PSFCH by allowing their time intervals to overlap, thereby utilizing the same time resources for multiple purposes. This combining approach increases transmission efficiency and time resource utilization while maintaining reliability through frequency domain separation and power control mechanisms that prevent signal interference
3Measurement precision
If power is allocated to both SL PRS and PSFCH in overlapping intervals, then signal quality improves, but total power consumption and interference increase
Solution Approach 1:
The patent applies local quality by allocating different power levels to SL PRS and PSFCH based on their specific requirements. Since SL PRS requires higher signal quality for accurate positioning measurements, it is allocated higher power in its specific time-frequency resources, while PSFCH receives appropriate power for reliable feedback transmission. This localized power optimization maintains signal quality where needed while avoiding excessive overall power consumption and inter-signal interference
Data Source
AI summary
According to an embodiment of the present disclosure, a method in which a first apparatus performs sidelink communication is provided. The method may comprise: receiving a PSCCH from a second apparatus; receiving a PSSCH related to the PSCCH from the second apparatus; transmitting an SL PRS for sidelink positioning to the second apparatus; determining a PSFCH resource for transmitting a PSFCH to the second apparatus based on the PSCCH and the PSSCH; and transmitting the PSFCH to the second apparatus based on the PSFCH resource, wherein a time interval in which the SL PRS is transmitted and a time interval in which the PSFCH is transmitted may overlap each other.