Sidelink Coordination Messages for Resource Availability Feedback
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Solution Overview
Problem
The Mode 2 resource allocation scheme for sidelink communication in 5G NR V2X lacks coordination between transmitting and receiving UEs to verify the availability of reserved sidelink resources, leading to potential collisions and increased communication latency.
Innovation Solution
A method and system for coordinating resource allocation between UEs in sidelink communication using coordination messages, where a receiving UE configures resources to transmit a coordination message back to the transmitting UE, indicating whether reserved resources are available or not, using time, frequency, and code domain resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If Mode 2 resource allocation scheme is used for sidelink communication, then autonomous UEs can independently select resources, but resource collisions and interference occur due to lack of coordination between transmitting and receiving UEs
Solution Approach 1:
The receiving UE provides feedback to the transmitting UE about the availability of reserved resources through coordination messages. This feedback mechanism enables the transmitting UE to adjust its resource selection based on actual channel conditions and receiving UE status, resolving the contradiction between autonomous selection and reliable resource availability.
Solution Approach 2:
Coordination messages act as an intermediary communication channel between transmitting and receiving UEs. These messages carry information about resource availability and decoding status, enabling coordinated resource allocation while maintaining autonomous operation of both UEs.
2Adaptability or versatility
If transmitting UE autonomously selects sidelink transmission resources based on channel sensing, then resource selection flexibility is improved, but communication latency increases due to lack of resource coordination
Solution Approach 1:
The receiving UE configures coordination resources in advance and provides feedback about resource availability before the transmitting UE finalizes its resource selection. This preliminary action allows the transmitting UE to make informed resource selections that avoid collisions and reduce latency.
Solution Approach 2:
Real-time feedback through coordination messages enables the transmitting UE to adjust resource selection dynamically, maintaining flexibility while reducing latency by avoiding retransmissions due to resource conflicts.
3Device complexity
If no coordination mechanism is used between UEs, then system complexity is reduced, but resource collision probability increases
Solution Approach 1:
Coordination messages serve as a simple intermediary that carries essential availability information between UEs. This minimal coordination mechanism resolves resource conflicts without requiring complex coordination protocols, maintaining low system complexity while improving reliability.
Data Source
AI summary
Disclosed are methods and systems to coordinate resource allocation between two UEs for sidelink communication. A receiving UE receiving sidelink communication from a transmitting UE may configure coordination resources used to coordinate sidelink communication between the two UEs. The receiving UE may receive from the transmitting UE data indicating resources reserved and intended to be used by the transmitting UE to transmit sidelink data to the receiving UE. The receiving UE may determine a coordination message used to indicate whether the resources reserved by the transmitting UE are available for use by the receiving UE to receive the sidelink data from the transmitting UE. The receiving UE may determine resources from the coordination resources to be used to carry the coordination message and may transmit the coordination message carried on the selected resources to indicate to the transmitting UE whether to use the reserved resources for the sidelink data.