Sidelink Resource Selection for Aperiodic Service Conflict Avoidance
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Solution Overview
Problem
In NR systems, the lack of periodicity in service arrivals leads to challenges in avoiding resource conflicts during sidelink data transmission, as opposed to LTE systems where periodicity allows for resource reservation and avoidance.
Innovation Solution
A terminal device selects a data resource and a separate indication resource within a selecting window, sending indication information to prevent other devices from using the reserved data resource, thus minimizing resource conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If terminal devices randomly select resources or determine resources by sensing in NR systems, then device complexity is reduced, but resource conflicts increase due to lack of periodicity in service arrivals
Solution Approach 1:
The terminal device performs preliminary sensing in a sensing window before the selecting window to detect resources occupied by other devices. This advance detection allows the device to exclude conflicting resources from its selection, resolving the contradiction by preparing resource conflict avoidance information before actual resource selection occurs
Solution Approach 2:
The system implements feedback through sensing mechanisms where terminal devices continuously monitor and detect resources occupied by other devices. This feedback information is used to adjust resource selection decisions, enabling dynamic avoidance of resource conflicts while maintaining autonomous selection
2Reliability
If terminal devices send indication information on separate control resources, then resource conflict avoidance improves, but device complexity increases due to separate resource selection
Solution Approach 1:
The resource selection process is segmented into two independent parts: sensing window for detecting other devices' resources, and selecting window for choosing own transmission resources. This segmentation allows each function to be optimized independently, improving resource conflict avoidance while managing complexity through modular design
Solution Approach 2:
Indication information serves as an intermediary that conveys resource reservation status between terminal devices. By sending this information on separately selected control resources, devices enable others to detect and avoid conflicts without direct coordination, resolving the contradiction through indirect communication
3Loss of time
If terminal devices select resources autonomously without periodicity-based reservation, then transmission delay is reduced, but resource conflicts increase
Solution Approach 1:
Terminal devices perform preliminary sensing and resource detection before actual transmission occurs. This advance preparation allows devices to identify and avoid conflicting resources without waiting for periodic reservation cycles, reducing transmission delay while maintaining conflict avoidance through proactive resource selection
Solution Approach 2:
The resource selection mechanism transitions from static periodic reservation to dynamic autonomous selection. Devices adaptively choose resources based on real-time sensing of other devices' transmissions, enabling flexible response to varying traffic patterns without periodic constraints, thus reducing delay while maintaining reliability
Data Source
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AI summary
The present application discloses a method for data transmission in a sidelink, and a terminal device, being able to avoid the occurrence of resource conflicts during transmission of an aperiodic service. Said method comprises: a first terminal device selecting a first resource from a data resource pool in a selection window, the first resource being used for sending data of the first terminal device; the first terminal device selecting, from a control resource pool in the selection window, a second resource for sending first indication information, the first indication information being used for indicating the first resource, the positions of the first resource and the second resource in a time domain and/or frequency domain being different; and the first terminal device sending the first indication information over the second resource, and sending the data of the first terminal device over the first resource.