Encrypted SSB Time Synchronization for Cellular Networks
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Solution Overview
Problem
Cellular communication networks, particularly those using 5G/NR technology, face challenges in providing accurate time synchronization due to clock drift and the need for costly modem implementations, as well as issues with accessibility and control over synchronization services.
Innovation Solution
Embedding time synchronization information into a Synchronization Signal Block (SSB) or System Information Block (SIB), encrypting it, and transmitting it within the cellular network, allowing for different device categories to access and utilize time synchronization services with varying levels of accuracy and security, using encryption keys and registration models to control access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If time synchronization information is transmitted without encryption, then accessibility and ease of operation are improved, but security and control over synchronization services deteriorate
Solution Approach 1:
The patent introduces encryption as an intermediary mechanism between the time synchronization information and receiving devices. The synchronization information is encrypted before transmission and can only be decrypted by authorized devices possessing the correct decryption keys. This intermediary encryption layer maintains security while allowing controlled access to the synchronization service.
2Measurement precision
If full-featured modems are implemented for time synchronization, then measurement precision and reliability are improved, but device complexity, cost, and power consumption increase
Solution Approach 1:
The patent extracts the time synchronization function from the complex full-featured modem and implements it as a separate, simplified subsystem. Devices can obtain time synchronization information through basic reception and decryption capabilities without requiring complete modem functionality. This extraction allows devices to achieve accurate time synchronization while reducing overall device complexity and cost.
Solution Approach 2:
The patent enables the use of simpler, lower-cost modem implementations that are sufficient for time synchronization purposes. Rather than requiring expensive, full-featured modems, the system allows devices with basic reception and decryption capabilities to achieve accurate time synchronization, effectively replacing complex permanent solutions with simpler alternatives.
3Measurement precision
If time synchronization is performed frequently to prevent clock drift, then time synchronization accuracy is improved, but use of energy and network traffic increase
Solution Approach 1:
The patent implements periodic transmission of encrypted time synchronization information at optimized intervals. Rather than continuous transmission, the system sends synchronization updates at calculated periods that maintain accuracy while minimizing energy consumption and network traffic. Devices wake periodically to receive updates and remain in low-power states between updates.
Data Source
AI summary
According to an example aspect of the present invention, there is provided a method comprising, embedding information for time synchronization to a SSB, encrypting the SSB and transmitting in a cellular communication network the encrypted SSB comprising the information for time synchronization.