Autonomous Sidelink Feedback Resource Allocation for V2X
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current sidelink radio communication techniques for vehicle-to-everything (V2X) applications face challenges in meeting high reliability and low latency requirements, particularly in unicast and feedback-based transmissions, as they rely on centralized scheduling and additional signaling with the radio access network, which can increase latency and reduce spectral efficiency.
Innovation Solution
A method for sidelink radio communication that allows for autonomous determination of feedback radio resources by the transmitting and receiving devices, enabling unicast mode transmissions and feedback control without relying on centralized scheduling, thus reducing latency and improving reliability by allowing feedback-controlled transmissions and adaptive modulation/coding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If centralized scheduling with RAN node is used to allocate feedback channel resources, then resource allocation control is improved, but latency increases and reliability decreases due to additional signaling requirements
Solution Approach 1:
The transmitting UE autonomously determines feedback channel resources without RAN node involvement. The UE selects resources from a pre-configured set based on its own transmission parameters, eliminating the need for centralized scheduling and reducing signaling latency.
Solution Approach 2:
A set of feedback channel resources is pre-configured in the UE before communication begins. This preliminary preparation allows the UE to immediately select appropriate feedback resources without waiting for RAN node allocation decisions, reducing latency while maintaining controlled resource usage.
2Reliability
If blind retransmission is used for unicast sidelink communication, then reliability is improved through multiple transmission attempts, but spectral efficiency decreases due to repeated transmissions without feedback
Solution Approach 1:
The receiving UE sends feedback signals (ACK/NACK) to the transmitting UE on pre-configured feedback channel resources. This feedback mechanism allows the transmitting UE to determine whether retransmission is necessary, improving spectral efficiency by avoiding unnecessary blind retransmissions while maintaining reliability through targeted retransmission when needed.
3Ease of operation
If RAN node involvement is required for feedback channel allocation, then resource management control is improved, but device complexity increases due to additional signaling protocols and procedures
Solution Approach 1:
The UE independently determines feedback channel resources using pre-configured parameters and its own transmission information, eliminating the need for complex signaling protocols with the RAN node. This self-service approach reduces device complexity while maintaining controlled resource allocation through pre-planned resource sets.
4Loss of time
If autonomous resource selection by transmitting device is used, then latency is reduced by eliminating centralized scheduling, but resource allocation control worsens without coordinated management
Solution Approach 1:
The pre-configured feedback channel resources serve multiple purposes: they provide autonomous selection capability for low latency, while also enabling controlled resource management through pre-planned allocation. The same resource set supports both independent UE selection and systematic resource management without requiring real-time coordination.
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
A technique for transmitting and receiving data (602) using a sidelink, SL, radio communication (604) between a first radio device (100) and a second radio device (200) is described. As to one method aspect of the technique, a scheduling assignment, SA (601), announcing a transmission of the data (602) for the second radio device (200) is broadcasted. The data is transmitted according to the SA (601) from the first radio device (100) in a unicast mode to the second radio device (200). Responsive to the data transmission, a control feedback (608) is received from the second radio device (200) in a unicast mode at the first radio device (100), wherein the control feedback (608) is received on a feedback radio resource (708) determined by at least one of the first radio device (100) and the second radio device (200).