Partial Sensing for NR V2X Sidelink Resource Allocation
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Solution Overview
Problem
Current communication systems, particularly in NR V2X, face challenges in partial sensing of sidelink channels, leading to inefficiencies in resource allocation and increased power consumption, especially in scenarios with configurable reservation periods and aperiodic traffic reservations.
Innovation Solution
The solution involves a method where a terminal device selects a predetermined number of potential candidate resources from a resource selection window for partial sensing, with the number being above a minimum threshold, and associates different minimum sizes of the resource selection window with various sets of values, enhancing partial sensing capabilities and accuracy by excluding unknown slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a terminal device performs partial sensing by selecting a minimum number of potential candidate resources, then device complexity and power consumption are reduced, but measurement precision and reliability of sensing results deteriorate due to unknown slots
Solution Approach 1:
The patent applies preliminary action by determining reserved resources based on resource reservation periods before performing partial sensing. The terminal device uses the resource reservation period to predict and exclude reserved resources from the sensing process in advance, ensuring that only non-reserved resources are sensed. This preliminary determination of reserved resources prevents measurement errors that would occur if sensing were performed on resources that are already reserved, thereby improving sensing accuracy without requiring full sensing of all resources.
Solution Approach 2:
The patent implements feedback by using sensing results to update resource selection decisions. The terminal device performs partial sensing on selected potential candidate resources, receives feedback about resource availability and occupancy, and then determines final resources for sidelink transmission based on this feedback. This feedback mechanism ensures that the terminal device can adapt its resource selection to avoid reserved resources while maintaining efficient partial sensing operation.
2Measurement precision
If a terminal device performs full sensing of all potential candidate resources, then measurement precision and reliability of sensing results improve, but device complexity and power consumption increase
Solution Approach 1:
The patent applies partial action by selecting a specific number of potential candidate resources for sensing rather than sensing all resources. The terminal device determines the number of resources to sense based on the resource selection window size and other parameters, performing sensing only on a partial set of resources that are most likely to be available. This partial sensing approach, combined with excluding reserved resources determined through resource reservation periods, maintains adequate measurement precision while significantly reducing power consumption compared to full sensing.
Solution Approach 2:
The patent uses preliminary action to determine and exclude reserved resources before performing partial sensing. By calculating which resources are reserved based on the resource reservation period and other terminal devices' transmission patterns, the system pre-identifies resources that should not be sensed or selected. This preliminary exclusion allows the terminal device to focus sensing efforts only on non-reserved resources, reducing overall sensing operations and power consumption while maintaining accurate sensing results for the relevant resource set.
3Use of energy by moving object
If a terminal device selects resources without sensing or partial sensing, then device complexity and power consumption are minimized, but reliability of resource allocation deteriorates due to potential resource conflicts
Solution Approach 1:
The patent applies preliminary action by determining reserved resources based on resource reservation periods before the terminal device selects its transmission resources. Other terminal devices announce their reserved resources in advance through sidelink control information, and the resource reservation period allows these reservations to be determined before resource selection occurs. This preliminary determination of reserved resources enables the terminal device to perform random selection from only the non-reserved resources, maintaining low power consumption while improving resource allocation reliability by avoiding conflicts with previously reserved resources.
4Adaptability or versatility
If the resource selection window size is increased, then the number of potential candidate resources increases improving resource allocation flexibility, but partial sensing effectiveness decreases due to larger sensing overhead
Solution Approach 1:
The patent applies partial action by selecting a specific number of potential candidate resources for sensing that is proportional to the resource selection window size but represents only a fraction of total resources. The terminal device determines the number of resources to sense based on parameters including the resource selection window size, ensuring that sensing is performed on a manageable subset even when the overall window is large. This approach maintains resource allocation flexibility through large selection windows while controlling partial sensing complexity by sensing only a partial set of resources.
Solution Approach 2:
The patent uses preliminary action to determine and exclude reserved resources before performing partial sensing on the remaining resources. By calculating which resources are reserved based on the resource reservation period and other terminal devices' transmission patterns, the system pre-identifies and removes reserved resources from the candidate set. This preliminary exclusion reduces the number of resources that need to be sensed, thereby reducing partial sensing complexity even when the resource selection window is large, while maintaining the flexibility benefits of the large window size.
Data Source
AI summary
Embodiments of the present disclosure provide a solution for partial sensing of sidelink channels. A method for communications comprises determining, at a first terminal device, a second resource in a resource selection window based on a first resource in a sensing window and a resource reservation period for a second terminal device. The method also comprises selecting, from the resource selection window, a resource as a candidate resource for a second sidelink transmission of the first terminal device by performing partial sensing of sidelink channels in the sensing window. The candidate resource is different from the second resource.