Autonomous Sidelink Resource Selection for C-V2X
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Solution Overview
Problem
In wireless communication systems, particularly in C-V2X systems, the autonomous resource selection by user equipment (UE) for physical sidelink control channels (PSCCHs) can lead to packet collisions and overlaps due to the selection of the same resources by multiple UEs.
Innovation Solution
The UE performs autonomous sidelink resource selection by excluding resources associated with transmissions at a signal strength above a certain threshold, determining a threshold percentage of resources, and randomly selecting resources for PSCCH transmissions from a set that excludes PSCCH resources while including corresponding PSSCH resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UE autonomously selects resources for PSCCH transmissions from the same resource pool as PSSCH, then resource utilization efficiency is improved, but packet collisions and overlaps between PSCCH and PSSCH increase
Solution Approach 1:
The resource pool is segmented into two distinct sets: a first resource set for PSCCH transmissions and a second resource set for PSSCH transmissions. This segmentation prevents collisions between control and data channels while maintaining efficient resource utilization by dedicating specific resources to each channel type.
Solution Approach 2:
PSCCH resources are extracted from the common resource pool and placed into a separate first resource set. This extraction eliminates the collision problem between PSCCH and PSSCH by ensuring they operate in independent resource spaces, while the second resource set remains available for PSSCH transmissions.
2Reliability
If UE excludes resources with signal strength above threshold from autonomous selection, then collision probability is reduced, but available resource pool size decreases
Solution Approach 1:
The UE performs preliminary sensing and measurement of signal strength in the resource pool before autonomous resource selection. Resources with signal strength above the threshold are identified and excluded in advance, preventing potential collisions before transmission occurs. This preliminary action ensures reliable transmission by avoiding occupied resources.
Solution Approach 2:
The system dynamically adjusts the signal strength threshold parameter based on channel conditions and traffic load. By changing this parameter, the balance between collision avoidance and resource availability is optimized - higher thresholds exclude more resources for reliability, while lower thresholds preserve more resources for productivity.
3Ease of operation
If UE randomly selects PSCCH resources from the third resource set, then selection simplicity is maintained, but resource selection precision decreases
Solution Approach 1:
The UE performs preliminary filtering of the resource pool to create the third resource set by excluding resources with high signal strength and resources already allocated for PSSCH. This preliminary action maintains selection simplicity while improving precision, as the random selection is then performed on a pre-filtered set of suitable resources rather than the entire pool.
Data Source
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AI summary
Certain aspects of the present disclosure provide techniques for user equipment (UE) autonomous sidelink resource selection. A method that may be performed by a UE includes performing autonomous sidelink resource selection. The selection includes excluding resources, from a first resource set, associated with transmissions at a signal strength above a signal strength threshold to form a second resource set. The selection includes determining a resource amount in the second resource set is at or above a threshold percentage of a resource amount in the first resource set. The selection includes excluding, from the second resource set, resources associated with physical sidelink control channels (PSCCHs) without excluding resources associated with physical sidelink shared channels associated with the PSCCHs to form a third resource set. The selection includes randomly selecting resources for a PSCCH transmission from the third resource set. The method includes sending the PSCCH transmission using the randomly selected resources.