V2X Resource Release Notification via Scheduling Assignment
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Solution Overview
Problem
In V2X communication, resources reserved for message transmission are often released prematurely due to changes in speed, progress angle, or location, leading to inefficient use as other V2X UEs are not aware of the resource availability changes, preventing them from adapting and reconfiguring resources effectively.
Innovation Solution
A method where a V2X UE determines if message transmission is possible on a reserved resource and transmits a scheduling assignment channel to notify other V2X UEs of resource unavailability, allowing for resource reconfiguration and adaptive message transmission on newly reserved resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a V2X UE releases a reserved resource before the preset time due to changes in speed, progress angle, or location, then the V2X UE can adapt to its new operational conditions, but other V2X UEs remain unaware of the resource availability change and cannot efficiently utilize the released resource
Solution Approach 1:
The patent implements a feedback mechanism where the V2X UE that releases a reserved resource transmits release information to other V2X UEs through the scheduling assignment channel. This feedback loop enables other UEs to become aware of the resource availability change and subsequently select and use the released resource for their own message transmissions, thereby resolving the information asymmetry problem and improving overall radio resource utilization efficiency.
2Stability of the object's composition
If a V2X UE maintains a reserved resource for the preset time even when no longer needed, then resource availability information is stable, but the resource cannot be reallocated to other V2X UEs that might need it
Solution Approach 1:
The patent introduces dynamic resource allocation by allowing V2X UEs to release reserved resources early when operational conditions change (speed, progress angle, or location changes exceed thresholds). The release information is transmitted to the network and other UEs, enabling the resource pool to dynamically adapt to changing traffic conditions. This dynamic approach balances resource stability with flexibility, allowing resources to be reallocated to UEs that need them while maintaining stable reservations when conditions warrant continued use.
3Reliability
If other V2X UEs are unaware of released resources, then resource reservation information remains consistent, but resource utilization efficiency decreases due to inability to adapt
Solution Approach 1:
The patent uses the scheduling assignment channel as an intermediary mechanism to transmit resource release information from the V2X UE that released the resource to other V2X UEs. This intermediary channel ensures reliable and consistent dissemination of resource availability changes across the V2X network, allowing all UEs to maintain synchronized knowledge of the resource pool state without compromising the consistency of resource reservation information.
Data Source
AI summary
The present invention provides a V2X operation method implemented by a V2X (vehicle-to-X) terminal in a wireless communication system, the method characterized by: determining whether or not V2X message transmission is possible on reserved periodic resources; and, if the V2X message transmission is not possible on the reserved periodic resources, transmitting to another V2X terminal a first scheduling assignment (SA) channel comprising information which indicates that the V2X message transmission is not possible on the reserved periodic resources.