Partial Sensing Resource Selection in NR V2X Sidelink
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Solution Overview
Problem
In wireless communication systems, especially in sidelink communication, the lack of guaranteed partial sensing window length leads to inaccurate collision detection, affecting power saving and reliability, particularly in scenarios like vehicle-to-everything (V2X) communications where resource selection is critical.
Innovation Solution
A method and device for performing wireless communication based on partial sensing, which involves triggering a resource selection procedure, determining a selection window within a packet delay budget, selecting candidate slots, and performing sensing within a contiguous partial sensing window, with the option to select a sidelink resource through random selection even if the number of slots is less than the minimum, optimizing power saving and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE performs partial sensing with a guaranteed sensing window length, then collision detection accuracy is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent changes the parameter of sensing window length from a fixed guaranteed value to a variable that can be adjusted based on available resources. The UE determines whether to perform partial sensing or random selection by comparing the actual sensing window length against a threshold, thereby adapting the collision detection accuracy to the available time resources while managing device complexity.
2Use of energy by moving object
If the UE performs partial sensing with insufficient slots, then power consumption is reduced, but collision detection accuracy deteriorates
Solution Approach 1:
The patent applies partial action by allowing the UE to perform sensing with fewer than the ideal number of slots when resources are limited. Instead of requiring a full guaranteed sensing window, the UE can perform partial sensing with available slots or switch to random selection, accepting reduced detection accuracy in exchange for lower power consumption in resource-constrained scenarios.
Solution Approach 2:
The patent changes the operational mode parameter based on the sensing window length. When the sensing window contains insufficient slots, the UE transitions from partial sensing mode to random selection mode, thereby adjusting the collision detection accuracy parameter to match the available power and time resources.
3Device complexity
If the UE performs random selection instead of partial sensing, then device complexity and power consumption are reduced, but resource selection reliability deteriorates
Solution Approach 1:
The patent changes the resource selection method parameter based on the sensing window length. When the sensing window is sufficient, the UE uses partial sensing to improve reliability. When the sensing window is insufficient, the UE switches to random selection to reduce complexity, thereby dynamically adjusting reliability based on available resources.
4Adaptability or versatility
If the sensing window length is not guaranteed, then adaptability to varying packet delay budgets is improved, but collision detection accuracy deteriorates
Solution Approach 1:
The patent makes the sensing window length dynamic rather than fixed. The sensing window is determined based on the packet delay budget and available resources, allowing the system to adapt to varying traffic requirements. The UE dynamically adjusts whether to perform partial sensing or random selection based on the actual sensing window length, thereby achieving adaptability while managing collision detection accuracy.
Data Source
AI summary
A method for a first device to perform wireless communication based on partial sensing and an apparatus supporting the same are provided. The method may comprise: triggering a resource selection procedure; determining a selection window within a packet delay budget (PDB) based on the triggering of the resource selection procedure; selecting Y candidate slots in the selection window; performing sensing within a contiguous partial sensing (CPS) window related to the Y candidate slots; and selecting a sidelink (SL) resource based on random selection within the selection window, based on the number of slots included in the CPS window which is less than a minimum number of slots, wherein Y is a positive integer.