V2X Demodulation Reference Signal Configuration for Mini-Slot Latency
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Solution Overview
Problem
Current Vehicle to Everything (V2X) communication systems in LTE face challenges in achieving low latency and high data transmission reliability, particularly in scenarios like remote driving and real-time video exchange, due to the limitations of using subframes as the minimum granularity for data transmission, which increases waiting times and does not meet the requirements for low latency.
Innovation Solution
The solution involves determining a demodulation reference signal in a time-domain resource with a number of symbols less than or equal to those in a slot or subframe, allowing for data information transmission and reception using non-slot or mini-slot resources, thereby reducing latency and improving transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If data transmission uses subframes as the minimum granularity in LTE V2X, then compatibility with LTE cellular communications is achieved, but latency increases and low-latency service requirements cannot be met
Solution Approach 1:
The patent segments the time-domain resource from the traditional subframe level down to slot and mini-slot levels. By dividing the subframe into smaller time units (slots containing multiple symbols, or mini-slots containing fewer symbols), the system enables finer-grained data transmission scheduling. This segmentation allows data to be transmitted in smaller time chunks, directly reducing the waiting time and latency while maintaining compatibility with the overall LTE subframe structure through hierarchical organization.
2Productivity
If data transmission uses non-slot or mini-slot resources, then latency is reduced and transmission efficiency is improved, but the complexity of determining demodulation reference signals increases
Solution Approach 1:
The patent implements dynamic adaptation of demodulation reference signal (DMRS) determination based on the actual time-domain resource configuration. When non-slot or mini-slot resources are used, the system dynamically adjusts the DMRS pattern, position, and density to match the reduced time duration. This dynamic approach allows the reference signal structure to flexibly adapt to different transmission scenarios, maintaining accurate channel estimation and demodulation performance while supporting higher data transmission rates through efficient use of reduced time resources.
3Loss of time
If the number of symbols in time-domain resource is reduced, then latency is reduced and real-time communication is enabled, but the reliability of data transmission may be compromised
Solution Approach 1:
The patent employs parameter changes to maintain transmission reliability despite reduced symbol count. By adjusting key parameters such as DMRS density (number of reference signals per resource), modulation and coding scheme (MCS) selection, and resource allocation patterns, the system compensates for the shorter transmission duration. These parameter optimizations ensure that even with fewer symbols available for data transmission, the effective code rate and error correction capability are maintained, thereby preserving data transmission reliability while achieving lower latency through mini-slot configurations.
Data Source
AI summary
Methods and apparatuses for information transmission and reception are provided. The method includes: determining a demodulation reference signal in a time-domain resource by a transmitting device at least according to the number of a part of symbols in the time-domain resource; wherein the number of symbols contained in the time-domain resource is less than or equal to the number of symbols contained in a slot or a subframe; and transmitting data information and the demodulation reference signal by the transmitting device to a receiving device by at least using the time-domain resource.