NR V2X Sidelink Resource Coordination Using Inter-UE Feedback
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing increasing data traffic and overhead in eNBs, particularly in vehicle-to-everything (V2X) communications, requiring enhanced mobile broadband and reliable low-latency solutions.
Innovation Solution
Implementing inter-UE coordination (IUC) through radio resource control (RRC) messages and medium access control (MAC) elements to manage SL resources, including the exchange of IUC capability, preferred and non-preferred resources, and transmission of SCI and MAC PDUs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If eNB intervention is used for resource management in V2X communications, then resource allocation can be controlled centrally, but communication overhead increases and scalability is limited
Solution Approach 1:
The patent extracts the resource management function from the eNB and relocates it to the UEs themselves through inter-UE coordination. The transmitting UE autonomously selects resources based on IUC information received from the receiving UE, eliminating the need for eNB intervention in sidelink resource allocation and reducing eNB overhead while maintaining reliable resource management.
Solution Approach 2:
The patent implements self-service by enabling UEs to autonomously manage their own sidelink resources through inter-UE coordination. The transmitting UE independently performs resource selection based on IUC information exchanged with the receiving UE, without requiring eNB control, thereby reducing network overhead while maintaining reliable resource allocation.
2Device complexity
If direct SL communication is established between UEs, then eNB overhead is reduced, but resource coordination and collision avoidance become more challenging
Solution Approach 1:
The patent implements feedback through the IUC mechanism where the receiving UE provides IUC information (preferred and non-preferred resources) to the transmitting UE. This feedback enables the transmitting UE to make informed resource selection decisions, avoiding collisions and ensuring reliable resource coordination without eNB intervention.
Solution Approach 2:
The patent uses IUC information as an intermediary mechanism to facilitate resource coordination between UEs. The receiving UE acts as a mediator by providing preferences about suitable resources, enabling the transmitting UE to select appropriate resources without direct eNB control, thus simplifying operation while maintaining coordination effectiveness.
3Loss of time
If autonomous SL resource selection is implemented, then latency is reduced, but resource collision and reliability may increase
Solution Approach 1:
The patent applies preliminary action by having the receiving UE prepare and provide IUC information (preferred and non-preferred resources) in advance to the transmitting UE. This allows the transmitting UE to perform autonomous resource selection with full knowledge of resource suitability, reducing latency while preventing collisions through pre-coordinated resource preferences.
Data Source
AI summary
Systems and techniques in which a first device performs wireless communication. For example, the first device may receive, from a second device, an RRC message including information related to whether inter-user equipment (UE) coordination capability is supported. For example, the first device may transmit an inter-UE coordination request MAC CE to the second device, on the basis of the information related to whether the inter-UE coordination capability is supported indicating that the inter-UE coordination capability is supported.