Sidelink Resource Selection via Inter-UE Coordination
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Solution Overview
Problem
In 5G sidelink communication systems, resource collisions occur when transmitting terminals select resources used by hidden or exposed terminals, leading to unsuccessful data transmission between vehicles in V2X communications.
Innovation Solution
A method where a first terminal requests and receives assistance information from a second terminal, selecting transmission resources based on this information to perform sidelink communication, reducing resource collisions by distinguishing between preferred and non-preferred resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If transmitting terminals select resources autonomously in sidelink communication, then resource selection flexibility is improved, but resource collision probability increases due to hidden and exposed terminals
Solution Approach 1:
The patent implements feedback mechanisms where terminals exchange resource selection information and collision detection data with neighboring terminals. This feedback loop enables terminals to adjust their resource selections based on actual channel conditions and other terminals' activities, resolving the contradiction between autonomous selection flexibility and collision avoidance reliability.
Solution Approach 2:
The patent introduces coordination messages and control information as intermediaries between transmitting terminals. These intermediaries carry resource selection indicators, collision detection results, and coordination data that enable indirect communication and coordination between terminals, allowing flexible autonomous selection while maintaining reliability through mediator-facilitated conflict resolution.
2Reliability
If resource coordination information is exchanged between terminals, then resource collision probability is reduced, but communication overhead increases
Solution Approach 1:
The patent extracts only the essential coordination information needed for collision avoidance from the full resource selection process. By taking out and transmitting only critical elements such as resource selection indicators, collision detection results, and coordination data rather than complete resource selection details, the system achieves reliable collision avoidance while minimizing communication overhead.
Solution Approach 2:
The patent implements partial coordination where terminals exchange resource coordination information selectively rather than comprehensively. By performing partial action - exchanging only the necessary subset of coordination data rather than all possible information - the system achieves sufficient collision avoidance reliability while keeping communication overhead manageable.
3Reliability
If assistance information is transmitted through multiple channels (PSCCH, PSSCH, PSFCH), then information delivery reliability is improved, but system complexity increases
Solution Approach 1:
The patent makes the resource coordination mechanism universal by enabling assistance information to be transmitted through multiple channels (PSCCH, PSSCH, PSFCH) depending on the specific scenario and information type. This multi-functionality approach allows the same coordination mechanism to adapt to different reliability requirements and channel conditions, improving information delivery reliability while managing complexity through scenario-based channel selection.
Data Source
AI summary
Disclosed is a communication method based on inter-UE coordination information in a sidelink. An operation method of a first terminal comprises the steps of: transmitting, to a second terminal, a first indicator for requesting transmission of support information; receiving the support information from the second terminal; selecting a transmission resource in consideration of a resource indicated by the support information; and performing sidelink communication by using the transmission resource.