Time Management Function Selecting Time Distribution Alternatives
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Solution Overview
Problem
Current methods for time synchronization in cellular networks face challenges such as redundancy against jamming/spoofing, GNSS satellite visibility issues, and low accuracy of traditional methods like NTP over IP.
Innovation Solution
The proposed solution involves configuring a Time Management Function (TMF) to select a Time Distribution Alternative (TDA) by transmitting report requests, receiving measurement reports, evaluating TDAs based on requirements and measurements, and selecting the most appropriate TDA to ensure robust time synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional NTP over IP is used for time synchronization, then implementation is simple, but accuracy is low
Solution Approach 1:
The patent segments the time synchronization system into multiple independent Time Distribution Alternatives (TDAs), each providing time through different pathways (e.g., GNSS-based, network-based). The TMF selects from these segmented options based on accuracy requirements, allowing high-accuracy GNSS to be used only when needed rather than universally, thus improving accuracy where required while maintaining simpler solutions elsewhere.
Solution Approach 2:
The patent changes the parameter of time synchronization accuracy by introducing multiple TDAs with different accuracy characteristics. The TMF dynamically selects TDAs based on varying accuracy requirements of different applications and conditions, allowing the system to achieve high accuracy (e.g., sub-microsecond) when needed while maintaining flexibility to use lower-accuracy but simpler methods when sufficient.
2Reliability
If local GNSS receiver is used for time synchronization, then UTC traceability is achieved, but vulnerability to jamming/spoofing increases
Solution Approach 1:
The patent introduces an intermediary TMF that mediates between the local GNSS receiver and the application. The TMF monitors the security status of GNSS signals and can switch to alternative TDAs when jamming or spoofing is detected. This intermediary layer provides UTC traceability through GNSS when available and secure, while protecting against harmful factors by enabling transition to alternative time sources when GNSS is compromised.
Solution Approach 2:
The patent prepares alternative time synchronization TDAs in advance as backup options. When GNSS becomes vulnerable to jamming or spoofing, the system can immediately switch to pre-configured alternative TDAs (such as network-based time distribution or other synchronization sources), providing beforehand cushioning against the harmful effects of GNSS jamming/spoofing while maintaining UTC traceability through the alternative paths.
3Reliability
If GNSS is used as primary sync source, then UTC traceability is achieved, but availability decreases in urban canyons or indoors
Solution Approach 1:
The patent implements dynamic selection of Time Distribution Alternatives based on real-time conditions. The TMF continuously monitors GNSS satellite visibility and signal quality, dynamically switching between GNSS-based TDAs and alternative TDAs (such as network-based time distribution or other synchronization sources). This dynamic adaptation allows the system to maintain UTC traceability when GNSS is available while automatically transitioning to alternative methods when satellite visibility is blocked in urban canyons or indoors.
Solution Approach 2:
The patent creates a universal time synchronization framework that can function through multiple different TDAs depending on environmental conditions. The system is designed to be multi-functional, supporting both GNSS-based time distribution (for outdoor/visible conditions) and alternative network-based time distribution (for indoor/urban canyon conditions), all managed by a single TMF that selects the appropriate TDA based on current adaptability requirements.
4Productivity
If multiple Time Distribution Alternatives are configured and evaluated, then service performance is improved, but system complexity increases
Solution Approach 1:
The patent implements a self-service TMF that automatically configures, monitors, and selects from multiple Time Distribution Alternatives without requiring manual intervention. The TMF autonomously evaluates TDA performance, monitors input conditions (such as signal quality, availability, and accuracy metrics), and dynamically selects the most appropriate TDA based on current service requirements. This self-service capability improves productivity by providing optimized time synchronization while managing configuration complexity through automation.
Data Source
AI summary
Methods, apparatuses, and computer readable media are disclosed for configuring a Time Management Function (TMF) to select a Time Distribution Alternative (TDA). The method includes configuring a set of TDAs. The method further includes transmitting a set of report requests with respect to the set of TDAs to an end station or a Timing Device (TD), and receiving a set of measurement reports with respect to the set of TDAs, from the end station or from the TD. Each of the set of measurement reports being specific TDA with input conditions. The method further includes evaluating the set of TDAs based on one or more requirements and the set of measurement reports, and selecting a currently most appropriate TDA among the set of TDAs based on results of the evaluating step and one or more conditions that may relate to the input conditions.