Sidelink Resource Reservation with Time Gap for Collision Avoidance
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Solution Overview
Problem
In the context of 5G NR sidelink communications, non-sensing terminal devices cannot perform re-evaluation and pre-emption operations, leading to a higher likelihood of resource collisions and degraded system performance due to their inability to detect and adjust resource allocations.
Innovation Solution
A method and device for initiating a first transmission on a first resource and reserving a second resource with a time gap, allowing sensing terminal devices to trigger resource reselection or pre-emption, either by including a reservation in the first transmission or through sidelink control channels, enabling coordination messages for resource management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If non-sensing terminal devices perform resource reservation without sensing capability, then resource allocation simplicity is improved, but resource collision likelihood increases
Solution Approach 1:
The patent introduces sensing terminal devices as intermediaries that monitor resource reservations and send coordination messages to non-sensing terminal devices. This mediator mechanism allows non-sensing devices to benefit from collision detection without requiring sensing capability themselves, resolving the contradiction between operational simplicity and collision reliability
Solution Approach 2:
The patent implements a feedback mechanism where sensing terminal devices detect resource reservations and transmit coordination messages back to non-sensing terminal devices. This feedback loop enables non-sensing devices to adjust their resource allocations based on channel conditions observed by sensing devices, maintaining simplicity while improving collision avoidance
2Reliability
If sensing terminal devices perform resource reselection, then resource collision avoidance is improved, but system complexity increases
Solution Approach 1:
The patent segments the terminal devices into two distinct groups: sensing terminal devices that perform monitoring and coordination, and non-sensing terminal devices that perform simple resource reservation. This segmentation allows the complex sensing and coordination functions to be concentrated in specific devices, reducing overall system complexity while maintaining collision avoidance capabilities
Solution Approach 2:
Sensing terminal devices autonomously perform resource monitoring, collision detection, and coordination message transmission without requiring centralized control. This self-service approach enables the system to handle resource conflicts distributedly, reducing control overhead and system complexity while maintaining high collision avoidance effectiveness
3Productivity
If time gap between first transmission and second transmission is reduced, then transmission efficiency is improved, but sensing device ability to trigger resource reselection deteriorates
Solution Approach 1:
The patent applies preliminary action by having non-sensing terminal devices reserve future resources in advance with sufficient time gap. This allows sensing terminal devices adequate time to monitor the reservation, detect potential collisions, and send coordination messages before the actual transmission occurs, ensuring both efficiency and reliability
Data Source
AI summary
The present disclosure provides a method in a first terminal device. The method includes: initiating a first transmission on a first resource; reserving a second resource for a second transmission; and initiating the second transmission on the second resource. The first resource and the second resource are separated by at least a time gap to enable a second terminal device that is to reserve or has reserved the second resource to trigger a resource reselection in response to sensing the first transmission within the time gap.