AI-Enabled Time Sync Reference Unit for 5G Wireless Backhaul
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Solution Overview
Problem
Incorrect time synchronization among nodes in 5G New Radio (5G NR) networks, particularly in Integrated Access Backhaul (IAB) deployments, leads to communication errors such as latency, dropped calls, and inaccurate positioning.
Innovation Solution
The implementation of an AI-Enabled Time Sync Reference Unit (TRU) calculates and adjusts time synchronization deltas between Radio Units (RUs) and Distributed Units (DUs) using machine learning to account for environmental conditions and network load, thereby ensuring precise timing across the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wireless Integrated Access Backhaul (IAB) is used to connect base stations without wired or fiber connections, then deployment flexibility and coverage are improved, but time synchronization accuracy deteriorates
Solution Approach 1:
The patent introduces a Time Sync Reference Unit (TRU) as an intermediary component that collects timing information from multiple Radio Units (RUs), calculates synchronization deltas using machine learning algorithms, and provides corrected timing information to the Distributed Unit (DU). This mediator approach resolves the time sync accuracy issue in wireless IAB deployments by compensating for propagation delays and clock drift through intelligent processing of timing measurements.
Solution Approach 2:
The system implements continuous feedback mechanisms where the TRU monitors timing differences between RUs, calculates synchronization offsets, and feeds back corrected timing information to the DU, which then adjusts the timing of signals transmitted to UEs. This closed-loop feedback system ensures ongoing time synchronization accuracy despite the challenges of wireless backhaul propagation.
2Productivity
If multiple cells or Radio Units with different clocks are used to provide network access, then network capacity and coverage are improved, but communication reliability deteriorates due to time sync errors
Solution Approach 1:
The TRU serves as a centralized timing coordination intermediary that manages time synchronization across multiple cells and RUs. It collects timing information from each RU, calculates individual synchronization deltas, and provides coordinated timing corrections to the DU, ensuring that all RUs operate with consistent timing despite using different local clocks. This enables the network to maintain high capacity while improving communication reliability through coordinated time sync.
3Measurement precision
If machine learning algorithms are used to calculate time synchronization deltas, then time synchronization accuracy is improved, but device complexity increases
Solution Approach 1:
The patent places the complex machine learning-based time synchronization calculations in a dedicated TRU component that acts as an intermediary between the RUs and the DU. This modular approach isolates the computational complexity to a specific reference unit rather than distributing it across all network nodes, thereby improving time synchronization accuracy while managing device complexity through functional separation.
Data Source
AI summary
An apparatus and method for time synchronization in 5th generation (5G) networks are presented. Time sync Reference Unit (TRU) instances are used to calculate synchronization deltas between Radio Units (RUs) and Distributed Units (DUs) and time offsets between antennas of an RU. Time synchronization data are collected from the antennas with reference signals synchronized using precision time protocol (PTP) signals, deltas calculated, and averaged to determine a synchronization offset that is applied to adjust the timing of the RUs and DUs. An artificial intelligence (AI) model is used to process timing data, accounting for environmental and network variables. The synchronization offsets are published for application adjustments, and feedback is collected to refine the AI model and enhance future synchronization accuracy.