V2X ACK/NACK Resource Pool Switching for Latency Reduction
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting ACK/NACK signals for V2X communication, particularly in managing resource pools and minimizing interference and latency during vehicle platooning services.
Innovation Solution
The method involves configuring a second resource pool for V2X communication from a first resource pool and transmitting ACK/NACK signals based on a time interval configured for ACK/NACK resource pool selection, using RRC signaling to determine the resource for transmission, considering factors like Code-Division-Multiplexing, Frequency-Division-Multiplexing, and Time-Division-Multiplexing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single resource pool is used for V2X communication, then the system structure is simple, but ACK/NACK transmission efficiency deteriorates due to resource conflicts and interference
Solution Approach 1:
The patent divides the resource pool into multiple segments (first resource pool for data transmission, second resource pool for ACK/NACK transmission) to eliminate resource conflicts. This segmentation allows different types of traffic to use dedicated resources, improving ACK/NACK transmission efficiency while maintaining manageable system complexity through structured resource allocation.
Solution Approach 2:
The patent introduces a time dimension by configuring different time intervals for data transmission and ACK/NACK transmission. By separating resources in the time domain, the system achieves efficient ACK/NACK transmission without requiring complex spatial or frequency resource management, thus balancing simplicity and efficiency.
2Productivity
If resource pool switching is implemented for ACK/NACK transmission, then transmission efficiency improves, but system complexity increases due to multiple resource pool management
Solution Approach 1:
The patent pre-configures the relationship between the first and second resource pools through higher-layer signaling before actual transmission occurs. This preliminary configuration includes setting time intervals, resource offsets, and mapping rules, which simplifies real-time decision-making at the UE level and reduces operational complexity despite having multiple resource pools.
Solution Approach 2:
The system implements feedback mechanisms where the base station configures resource pool parameters based on observed transmission patterns and UE capabilities. This feedback loop allows the system to optimize resource pool management dynamically, reducing complexity by adapting to actual traffic conditions rather than maintaining fixed complex configurations.
3Quantity of substance
If ACK/NACK transmission uses the same resource pool as data transmission, then resource utilization is high, but interference increases and transmission reliability deteriorates
Solution Approach 1:
The patent extracts ACK/NACK transmission resources from the data transmission resource pool and places them in a dedicated second resource pool. This extraction eliminates interference between data and control signals, improving ACK/NACK transmission reliability. The time interval configuration ensures that ACK/NACK resources are separated from data resources in both time and frequency domains.
4Loss of time
If time interval for ACK/NACK resource pool selection is reduced, then latency decreases, but resource selection accuracy deteriorates
Solution Approach 1:
The patent pre-configures resource pool parameters and selection criteria through higher-layer signaling before the time interval expires. This preliminary action allows the UE to have multiple pre-evaluated resource options ready, enabling fast selection within the shortened time interval while maintaining accuracy through pre-computed resource quality metrics and configured selection rules.
Data Source
AI summary
The present invention relates to a method and an apparatus for transmitting, by a vehicle-to-everything (V2X) terminal, acknowledgement/negative acknowledgement (ACK/NACK) in a wireless communication system. Specifically, the method of the present invention comprises the steps of: changing a resource pool configuration for a V2X communication from a first resource pool to a second resource pool; and transmitting the ACK/NACK on the basis of at least one of the first resource pool and the second resource pool, on the basis of a time interval established to select an ACK/NACK resource pool, with respect to a message received on the basis of the first resource pool.