Hybrid TRS Pattern for High-Doppler UE Synchronization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless communications systems face challenges in providing reliable fine time and frequency tracking for UEs in high-speed scenarios due to maximum doppler shift exceeding the pull-in range for carrier frequency offset estimation, leading to unreliable TRS acquisition and synchronization.
Innovation Solution
Implementing an enhanced TRS pattern with a first portion and a second portion, where the first portion follows existing TRS patterns and the second portion includes additional TRS transmissions with reduced symbol intervals, allowing for a larger pull-in range and enabling reliable time and frequency synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional TRS patterns are used, then device complexity is reduced and ease of operation is maintained, but reliability of time and frequency tracking deteriorates in high-speed scenarios
Solution Approach 1:
The TRS pattern is divided into a first portion with traditional symbol gaps and a second portion with reduced symbol gaps. This segmentation allows the system to maintain compatibility with existing TRS patterns while introducing enhanced tracking capability for high-speed scenarios, thereby improving reliability without entirely replacing the original pattern structure.
Solution Approach 2:
The TRS pattern transitions from a static traditional structure to a dynamic hybrid structure that adapts to different speed scenarios. The second portion with reduced symbol gaps is activated specifically when high-speed tracking is needed, making the system dynamically adjustable rather than uniformly complex across all operating conditions.
2Reliability
If TRS transmission interval is reduced to increase pull-in range, then reliability of synchronization improves, but loss of time for data transmission increases
Solution Approach 1:
Instead of reducing symbol gaps throughout the entire TRS pattern, the invention applies reduced symbol gaps only in the second portion, using partial action. This provides the necessary pull-in range extension for high-speed scenarios while minimizing the impact on overall data transmission time, as the first portion maintains the original timing structure.
Solution Approach 2:
The enhanced tracking capability with reduced symbol gaps is applied locally in the second portion of the TRS pattern, specifically where it is needed for high-speed pull-in range extension. The first portion maintains traditional spacing, creating different local qualities within the same TRS pattern to address different functional requirements.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit, to a base station, a UE capability to receive a first portion of a tracking reference signal (TRS) and a second portion of the TRS, the first portion and the second portion associated with a TRS pattern. The UE may receive, from the base station, an indication of the TRS pattern, where the TRS pattern includes the first portion of the TRS pattern and the second portion of the TRS pattern. The UE may receive one or more TRSs according to the first portion of the TRS pattern and the second portion of the TRS pattern.