5G Uplink Time Synchronization for Sub-Microsecond TSN Accuracy
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Solution Overview
Problem
Current 5G systems face challenges in achieving high-precision time synchronization between TSN master and slave devices, particularly in uplink scenarios due to excessive air interface synchronization errors, which exceed the required 1 μs error threshold.
Innovation Solution
An access network device obtains indication information to determine the precision requirements for time synchronization and performs adjustments such as timing advance commands and subcarrier spacing to ensure high-precision synchronization, reducing air interface errors and meeting synchronization error requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink time synchronization is implemented in 5G system, then TSN devices can achieve time synchronization, but air interface synchronization error becomes excessively large exceeding 1 μs threshold
Solution Approach 1:
The patent applies parameter changes by adjusting the timing advance command parameters and subcarrier spacing configurations to reduce the air interface synchronization error. The access network device modifies these parameters dynamically to ensure synchronization error remains within the 1 μs threshold while maintaining uplink time synchronization capability.
Solution Approach 2:
The patent implements feedback mechanisms where the access network device obtains indication information about synchronization requirements from terminal devices, continuously monitors synchronization status, and adjusts timing advance commands accordingly. This closed-loop feedback ensures synchronization error is kept within acceptable limits.
2Measurement precision
If timing advance commands and subcarrier spacing adjustments are performed, then synchronization accuracy is improved, but access network device complexity increases
Solution Approach 1:
The patent applies universality by designing the access network device to perform multiple functions: obtaining indication information about synchronization requirements, calculating timing advance commands, adjusting subcarrier spacing, and monitoring synchronization status. This multi-functional approach consolidates complexity into a single device rather than requiring multiple separate components.
Data Source
AI summary
This application provides a time synchronization method, an access network device, a communication apparatus, a computer storage medium, and a communication system. The method includes: A first access network device obtains first indication information, where the first indication information is used to indicate that a first terminal has a requirement for receiving or sending an uplink time synchronization message, and/or the indication information is used to indicate a precision requirement for time synchronization between the first terminal and a wireless network. The first access network device performs time synchronization on the first terminal based on the first indication information. This can avoid a case in which a requirement on a synchronization error of a time sensitive network TSN in an uplink time synchronization scenario cannot be met due to an excessively large air interface synchronization error, so that synchronization between TSN devices is improved, and TSN performance is improved.