Partial Sensing for CBR Measurement in NR V2X
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Solution Overview
Problem
In sidelink communication, partial sensing for channel busy ratio (CBR) measurement can lead to reduced accuracy due to the limited number of slots considered, affecting resource selection in wireless communication systems.
Innovation Solution
A method and device for determining candidate slots for sidelink resource selection, where sensing is performed based on a number of slots greater than or equal to a threshold, allowing for more accurate CBR measurement and resource selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If partial sensing is performed to save power, then energy consumption is reduced, but measurement precision of CBR deteriorates
Solution Approach 1:
The patent applies partial sensing by having the UE perform sensing only in a subset of slots (partial sensing window) rather than all slots. The UE measures CBR based on the limited slots where sensing is performed, and uses this partial measurement to make resource selection decisions. This resolves the contradiction by accepting partial measurement action to achieve energy savings while maintaining adequate CBR measurement for resource selection.
2Measurement precision
If sensing is performed based on a number of slots greater than or equal to a threshold, then measurement precision of CBR is improved, but the complexity of the sensing process increases
Solution Approach 1:
The patent changes the parameter of sensing window size to be configurable and adjustable. By setting the sensing window to include a number of slots greater than or equal to a threshold, the system can improve CBR measurement accuracy while managing complexity through parameter optimization rather than structural complexity increases.
3Measurement precision
If full sensing is performed instead of partial sensing, then measurement precision of CBR is improved, but use of energy increases
Solution Approach 1:
The patent implements partial sensing as a compromise between full sensing and no sensing. The UE performs sensing in a partial set of slots rather than all slots (full sensing) or no slots (no sensing). This partial action provides adequate CBR measurement for resource selection while consuming less energy than full sensing would require.
Data Source
AI summary
In one embodiment, a method by which a first device performs wireless communication is proposed. The method may comprise the steps of: determining at least one first candidate slot for selecting a first sidelink (SL) resource; performing sensing of at least one first slot related to the at least one first candidate slot; and selecting the first SL resource in the at least one first candidate slot on the basis of the sensing. For example, a first channel busy ratio (CBR) related to the at least one first slot may be measured on the basis of the number of the at least one first slot that is greater than or equal to a first threshold value.