Sidelink Resource Allocation for Retransmission in V2X
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Solution Overview
Problem
Current wireless communication systems face challenges in quickly and reliably allocating resources for retransmitting sidelink signals, particularly in scenarios requiring low latency and high reliability, such as vehicle-to-everything (V2X) communications.
Innovation Solution
A method and device for transmitting and receiving sidelink signals, involving the reception of resource allocation from a base station, initial transmission using a first resource, receipt of a Hybrid Automatic Repeat Request (HARQ) non-acknowledgement (NACK) signal, and subsequent retransmission using a second resource selected from a pre-configured pool based on availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resources are allocated dynamically for sidelink retransmission, then reliability is improved, but latency increases due to resource allocation signaling overhead
Solution Approach 1:
The system pre-configures resource pools for sidelink retransmission before actual communication occurs. When a NACK is received, the transmitting UE can immediately select and use pre-allocated resources from the configured pool without waiting for dynamic scheduling signaling, thus reducing latency while maintaining reliable retransmission capability
Solution Approach 2:
The transmitting UE autonomously selects resources from the pre-configured pool for retransmission without requiring network scheduling intervention. This self-service mechanism allows the UE to independently handle retransmission resource allocation, eliminating signaling overhead and reducing latency while ensuring reliable communication through HARQ feedback
2Loss of time
If a pre-configured resource pool is used for retransmission, then latency is reduced, but resource utilization efficiency deteriorates
Solution Approach 1:
The system combines static pre-configured resource pools with dynamic selection mechanisms. The UE dynamically selects specific resources from the pre-configured pool based on current channel conditions and transmission needs, allowing the system to maintain low latency through pre-configuration while improving resource utilization through adaptive, condition-based selection
Data Source
AI summary
An embodiment relates to a method for transmitting and receiving a sidelink signal for a first terminal in a wireless communication system, the method comprising the steps of: receiving, from a base station, a signal for allocating one or more first resources; transmitting the sidelink signal to a second terminal by using the one or more first resources; receiving, from the second terminal, a hybrid automatic repeat request (HARQ) non-acknowledgement (NACK) signal, in response to the sidelink signal; and retransmitting the sidelink signal to the second terminal by using a second resource, wherein the second resource is selected from a preset source pool on the basis of the absence of a resource for the retransmission of the sidelink signal.