eV2X Resource Selection Latency Reduction via Dynamic Exclusion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication technologies face challenges in reducing latency between packet arrival at the physical layer and resource selection for transmission in eV2X, particularly in Vehicle-to-Everything (V2X) scenarios, where a tradeoff is needed between the percentage of candidate resources and channel quality to meet latency requirements without compromising coverage or increasing collision probability.
Innovation Solution
The method involves excluding resources from the resource set for packets transmission based on parameters such as the required percentage of candidate resources, maximum power threshold of interference signal, and maximum number of times for increasing power threshold, considering Channel Busy Ratio (CBR) and ProSe Per Packet Priority (PPPP) to optimize resource selection and minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the resource selection window size is reduced to meet latency requirements of 10 ms or less, then latency is reduced, but the percentage of candidate resources in the resource set falls below the default 20% requirement
Solution Approach 1:
The patent dynamically adjusts the resource selection window size based on latency requirements rather than using a fixed window. The window size is adapted to be shorter when low latency is required, and the system compensates by adjusting other parameters to maintain sufficient candidate resources. This dynamic approach allows the system to meet both latency targets and candidate resource percentage requirements under different operating conditions.
Solution Approach 2:
The patent changes multiple parameters simultaneously to resolve the contradiction: it adjusts the resource selection window size, modifies the threshold for excluding resources based on interference power, and adapts the candidate resource percentage requirement based on channel conditions. By coordinating changes in these parameters, the system can achieve low latency while maintaining adequate candidate resource availability.
2Quantity of substance
If the percentage of candidate resources is guaranteed by increasing the allowed power threshold of interference signal, then the candidate resource percentage is maintained, but the SINR of candidate resources decreases resulting in reduced coverage and increased collision probability
Solution Approach 1:
The patent applies different interference power thresholds to different resource candidates based on their specific channel conditions. Instead of using a uniform threshold that guarantees minimum candidate resource percentage, the system evaluates each resource candidate individually and applies local adjustments to the threshold based on measured interference levels and channel quality. This allows the system to maintain sufficient candidate resources while preserving high SINR for each selected resource.
Solution Approach 2:
The patent performs preliminary evaluation of resource candidates by measuring interference power and channel conditions before final resource selection. By conducting this preliminary assessment, the system can identify resources that meet both the candidate percentage requirement and the SINR threshold requirement, avoiding the need to lower SINR thresholds to meet percentage targets. The preliminary action enables informed decision-making that balances both objectives.
Data Source
AI summary
Method and apparatus for reduction of latency between the time when packets arrive at Layer 1 and the time when resource is selected for transmission are disclosed. One method of the apparatus for latency reduction includes excluding resource from a resource set for packets transmission on SL based on at least one of parameters which are determined according to a latency requirement for the packets, wherein, the parameters comprise a required percentage of the candidate resource in the resource set, maximum power threshold of interference signal, and maximum number of times for increasing power threshold of interference signal.