V2X Terminal Dynamic CBR Adaptation for Interference Reduction
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Solution Overview
Problem
In V2X communication, V2X terminals continue to perform operations based on previous Channel Busy Ratio (CBR) values even after they have changed, leading to interference with other terminals and excessive resource re-reservation due to increased CBR values.
Innovation Solution
A method for V2X User Equipment (UE) to dynamically adjust V2X communication based on changed CBR values by switching to new frequency or time resources, signaling changes in transmission periods, and managing re-transmissions, thereby reducing interference and resource collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a V2X terminal performs resource reservation based on CBR, then resource allocation is established, but the terminal cannot adapt to CBR changes and continues to use previous CBR values, leading to communication interference
Solution Approach 1:
The patent implements dynamic CBR monitoring and adaptation by allowing the terminal to detect CBR changes after resource reservation and switch between previously reserved resources and newly selected resources based on current CBR conditions. This dynamic adjustment mechanism enables the system to adapt to changing channel conditions while maintaining communication reliability.
Solution Approach 2:
The patent employs feedback mechanisms where the terminal continuously monitors CBR values and uses this feedback information to adjust its resource selection. When CBR changes are detected, the terminal feedback-adaptively switches resource allocation strategies, ensuring communication reliability under varying channel conditions.
2Stability of the object's composition
If a V2X terminal continues to perform communication based on previous CBR values after CBR increases, then resource reservation stability is maintained, but communication interference with other terminals increases
Solution Approach 1:
The patent introduces dynamic resource selection where the terminal can switch between stable previously reserved resources and newly selected resources based on real-time CBR conditions. This dynamic approach maintains stability when conditions are good while adapting to reduce interference when CBR increases, resolving the contradiction between stability and interference avoidance.
Solution Approach 2:
The patent changes the resource selection parameter based on CBR conditions. When CBR is low, the terminal uses stable previously reserved resources; when CBR increases, it switches to newly selected resources. This parameter change strategy maintains resource reservation stability while adapting to reduce communication interference.
3Adaptability or versatility
If a V2X terminal performs frequent resource re-reservation to adapt to CBR changes, then communication adaptability improves, but resource re-reservation overhead and complexity increase
Solution Approach 1:
The patent implements a dynamic yet controlled resource selection mechanism where the terminal monitors CBR changes and selectively switches between previously reserved and newly selected resources. This dynamic approach provides CBR adaptability while avoiding excessive resource re-reservation operations, thereby controlling resource management complexity.
Solution Approach 2:
The patent applies partial resource re-reservation by only performing full resource re-selection when necessary based on CBR change detection. The terminal can partially adapt by switching between resource sets without always performing complete re-reservation, reducing the overhead and complexity while maintaining necessary adaptability.
4Stability of the object's composition
If a V2X terminal uses previously reserved resources after CBR increases, then resource allocation consistency is maintained, but the likelihood of communication interference increases
Solution Approach 1:
The patent implements dynamic resource allocation consistency where the terminal maintains consistent resource usage when CBR is stable but switches to new resources when CBR changes. This dynamic consistency approach ensures resource allocation stability under normal conditions while adapting to reduce interference when channel conditions deteriorate.
Solution Approach 2:
The patent changes the resource allocation parameter based on CBR conditions. When CBR is stable, the terminal maintains consistent use of previously reserved resources; when CBR increases, it switches to newly selected resources. This parameter change strategy maintains resource allocation consistency while adapting to reduce interference likelihood.
Data Source
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AI summary
Provided is a vehicle-to-X (V2X) operation method executed by a V2X UE in a wireless communication system, the method comprising: determining whether a channel busy ratio (CBR) value has changed after resource reservation is performed; and performing V2X communication based on the determination, wherein, if the CBR value has changed after the resource reservation is performed, the V2X communication is performed based on the changed CBR value.