V2X Terminal DMRS Sequence Generation for Short TTI
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems lack defined methods for generating demodulation reference signals (DMRS) and channel scrambling information for vehicle-to-X (V2X) communication using short transmission time intervals (TTIs), which are essential for efficient V2X communication, especially in next-generation mobile communication systems like IMT-Advanced and LTE-Advanced.
Innovation Solution
A method for determining DMRS sequence generation and channel scrambling information is provided, where the information is calculated based on specific equations and rules, allowing V2X UE to perform V2X communication using either short TTIs or legacy TTIs, ensuring compatibility and efficient interference randomization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If short TTI-based V2X communication is introduced to improve communication efficiency and reduce latency, then communication speed and responsiveness are improved, but there is no defined method for DMRS generation and channel scrambling, leading to system incompatibility and implementation complexity
Solution Approach 1:
The patent applies universality by enabling the V2X communication system to support multiple TTI lengths (both short TTI and legacy 1ms TTI) using a unified framework. The DMRS generation and channel scrambling methods are designed to be adaptable to different TTI configurations, allowing the same system to serve both low-latency V2X applications and traditional cellular communications without requiring separate dedicated systems.
Solution Approach 2:
The patent utilizes parameter changes by introducing configurable TTI length parameters that can be adjusted based on communication requirements. The DMRS generation process incorporates TTI length as a variable parameter, and the channel scrambling initialization uses both TTI index and symbol index parameters to adapt the scrambling behavior to the specific TTI configuration being used.
2Reliability
If DMRS sequence generation and channel scrambling methods are defined for short TTIs to ensure communication reliability, then communication reliability is improved, but the system complexity increases due to multiple TTI configuration options
Solution Approach 1:
The patent applies segmentation by dividing the V2X communication framework into distinct configurable components: short TTI mode and legacy TTI mode. Each mode has its own specific DMRS generation and channel scrambling procedures. This segmentation allows the system to implement reliable communication for each mode independently while providing clear implementation boundaries that reduce overall system complexity.
Solution Approach 2:
The patent implements dynamics by making the TTI length and associated processing parameters configurable rather than fixed. The system can dynamically select between short TTI and legacy TTI modes based on communication requirements, and the DMRS generation and channel scrambling processes adapt their behavior according to the selected mode, allowing flexibility without requiring separate hard-coded paths for each scenario.
3Measurement precision
If separate definitions are created for DMRS generation and channel scrambling in short TTI to ensure proper signal processing, then signal processing accuracy is improved, but the difficulty of detecting and measuring system parameters increases
Solution Approach 1:
The patent applies preliminary action by pre-defining the DMRS generation and channel scrambling methods for short TTI configurations before actual V2X communication begins. The specification establishes clear formulas and procedures in advance, so that when short TTI mode is activated, the UE can immediately apply the predefined methods without needing to detect or measure complex parameters during operation. This eliminates the need for real-time parameter detection and simplifies implementation.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention provides a short transmission time interval (S-TTI)-based vehicle-to-X (V2X) communication method performed by a V2X terminal in a wireless communication system, in which the S-TTI is relatively shorter than a legacy transmission time interval (L-TTI), the method comprising: determining information used for generation of a demodulation reference signal (DMRS) sequence and information used for channel scrambling; and performing the S-TTI-based V2X communication on the basis of the determination, wherein the L-TTI corresponds to a plurality of S-TTIs.