NTN Synchronization Assistance for Multi-Satellite Timing Alignment
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Solution Overview
Problem
Existing communication systems face challenges in satellite-based Non Terrestrial Networks (NTN) due to large propagation delays and complex network deployments, which affect synchronization and synchronization assistance information delivery, particularly in scenarios involving multiple satellites serving ground cells.
Innovation Solution
A method and system for providing synchronization assistance information, including ephemeris data and timing offsets, to enable terminal devices to achieve time and frequency synchronization, utilizing GNSS capabilities and predefined rules for accurate timing advance adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional synchronization methods are used in NTN systems, then the system structure remains simple, but synchronization accuracy deteriorates due to large propagation delays
Solution Approach 1:
The network device performs preliminary actions by calculating and providing synchronization assistance information (including ephemeris information and timing advance values) before the terminal device needs to establish synchronization. This allows the terminal to proactively acquire synchronization using its GNSS capabilities, addressing the large propagation delay issue without requiring complex real-time synchronization protocols.
Solution Approach 2:
The patent introduces synchronization assistance information as an intermediary element that mediates between the network device and terminal device. This intermediary contains ephemeris information and timing parameters that enable the terminal to calculate appropriate timing advance values, thereby achieving accurate synchronization without direct complex interactions between the terminal and network.
2Reliability
If multiple satellites relay signals in complex network scenarios, then communication coverage is improved, but synchronization reliability deteriorates
Solution Approach 1:
The network device provides synchronization assistance information in advance, including ephemeris information and timing advance values, before the terminal needs to synchronize. This preliminary provision of synchronization parameters enables the terminal to maintain reliable synchronization even when multiple satellites are involved in signal relay, as the terminal can calculate appropriate timing based on pre-provided satellite ephemeris data.
Solution Approach 2:
The patent employs parameter changes by dynamically adjusting timing advance values and synchronization parameters based on the specific network deployment scenario and satellite configuration. The network device modifies synchronization assistance information according to the actual communication path, enabling reliable synchronization across diverse scenarios including multiple satellite relay configurations.
Data Source
AI summary
The present application relates to an information transmission method, a terminal device, and a network device. The information transmission method comprises: a terminal device receives synchronization assistance information, the synchronization assistance information having a first association relationship with first information; the terminal device is synchronized according to the synchronization assistance information.