Sidelink Resource Window Re-Evaluation for Collision Avoidance
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Solution Overview
Problem
In 5G NR-V2X sidelink communication, when the remaining time interval for resource re-selection is limited, there is an insufficient amount of resources available for re-evaluation and pre-emption checking, making it difficult for transmitting user equipment to find suitable replacement resources for transmission, leading to potential collisions.
Innovation Solution
A user equipment (UE) is configured to determine a subset of resources within a first resource selection window as part of a re-evaluation and pre-emption checking procedure, extending the selection window if necessary, to ensure coverage by periodic-based partial sensing results and prioritize earlier resources for selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the resource selection window is limited to the original candidate slots, then the device complexity is reduced, but the reliability deteriorates due to insufficient resources for re-evaluation and pre-emption checking
Solution Approach 1:
The resource selection window is segmented into two parts: the original candidate slots and an extended portion. This segmentation allows the system to extend the resource selection window beyond the original candidate slots when re-evaluation and pre-emption checking are triggered, providing additional resources for reliable communication without permanently increasing system complexity
Solution Approach 2:
The resource selection window is made dynamic rather than fixed. It can be extended beyond the original candidate slots when needed for re-evaluation and pre-emption checking, and returns to its original size when not needed. This dynamic adjustment resolves the contradiction by adapting the window size to actual communication needs
2Reliability
If the resource selection window is extended to ensure coverage by sensing results, then the reliability is improved, but the loss of time increases due to extended monitoring period
Solution Approach 1:
Periodic-based partial sensing is performed in advance to obtain sensing results before resource selection. This preliminary action ensures that when the resource selection window is extended for re-evaluation and pre-emption checking, the necessary sensing results are already available, avoiding additional time loss from real-time sensing during the extended window period
3Quantity of substance
If the resource selection window is extended beyond candidate slots, then the quantity of available resources is increased, but the difficulty of detecting and measuring increases
Solution Approach 1:
Sensing results are obtained in advance through periodic-based partial sensing before the resource selection process. This preliminary detection of resources in the extended window area reduces the difficulty of detecting and measuring resources during the actual selection phase, as the extended window can utilize pre-obtained sensing information
Data Source
AI summary
A user equipment (UE) and a resource monitoring method in sidelink communication are disclosed. The resource monitoring method in sidelink communication by the UE includes being triggered, by a higher layer, to determine a subset of resources in a first resource selection window as a part of a re-evaluation and pre-emption checking procedure, wherein the first resource selection window is within a set of candidate slots.