NR V2X Sidelink Resource Window Selection Under Channel Congestion
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently selecting transmission and retransmission resources for sidelink communication in NR V2X scenarios, particularly in determining an optimal selection window based on service type, priority, and congestion levels.
Innovation Solution
A method for a transmitting terminal to determine a selection window and sub-selection windows to efficiently select transmission resources based on sensing operations, considering remaining delay budget, service type, priority, and channel busy ratio (CBR).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transmission terminal selects resources from a selection window based on sensing operations, then resource selection effectiveness is improved, but the complexity of determining the optimal selection window increases
Solution Approach 1:
The selection window is divided into multiple sub-selection windows, each corresponding to a different service type (e.g., casting type, priority level). This segmentation allows the terminal to manage resource selection by processing smaller, type-specific windows rather than handling the entire selection window at once, reducing computational complexity while maintaining comprehensive resource evaluation.
Solution Approach 2:
Different sub-selection windows are created with specific characteristics tailored to their corresponding service types. Each sub-window is optimized for its particular service requirements (e.g., latency-sensitive services get dedicated windows), allowing the terminal to apply appropriate selection criteria locally for each service type rather than using a uniform approach.
2Productivity
If the selection window is divided into sub-selection windows based on service type, then resource selection efficiency is improved, but the number of windows to manage increases
Solution Approach 1:
The sub-selection windows are organized within a unified resource pool structure that can be configured to support multiple service types simultaneously. The same basic window management mechanism applies across all sub-windows, allowing the terminal to reuse existing control logic and data structures while managing multiple service-specific windows, thus reducing the practical burden of managing increased window quantities.
3Reliability
If resources are selected based on remaining delay budget and priority, then transmission reliability is improved, but the complexity of evaluating multiple criteria increases
Solution Approach 1:
The terminal performs sensing operations in advance to identify and evaluate potential resources before the actual transmission time. By pre-evaluating resources against the multiple criteria (delay budget, priority, congestion level) during the sensing phase, the terminal prepares selected resources ahead of time, reducing the computational burden during transmission and simplifying real-time decision-making.
Data Source
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AI summary
A method by which a first device performs wireless communication is presented. The method can comprise the steps of: determining a first selection window for selecting a resource related to sidelink transmission; determining N number of preset second selection windows in the first selection window; selecting a resource on the basis of the number of idle resources in the N number of second selection windows; and transmitting, on the resource, a PSCCH and a PSCCH related to the PSCCH to a second device. For example, N can be a positive integer.