Cloud DTP Calibration Platform for HFC Network Sync
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Solution Overview
Problem
Mobile networks, such as 4G/5G cellular networks, require high-accuracy synchronization sources in backhaul, mid-haul, or fronthaul where GPS signals are unreliable. The DOCSIS Timing Protocol (DTP) provides sync signals in Xhaul over Hybrid Fiber Coax (HFC) networks, but its calibration cannot be performed for individual devices like cable modems or CMTS, leading to insufficient accuracy of sync signals.
Innovation Solution
A cloud-based DTP calibration method and platform are introduced to automate the calibration of DTP in the field. The platform, accessible via a web GUI and API, allows for the storage, retrieval, and application of DTP calibration data, ensuring accurate time delivery to base stations without reliable GPS signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If DTP calibration is performed manually for each device, then calibration accuracy can be ensured, but the complexity and time required for deployment increases significantly
Solution Approach 1:
The patent pre-calibrates DTP parameters in a laboratory environment for various device combinations before deployment. Calibration profiles are determined in advance and stored in a database, eliminating the need for complex field calibration procedures while maintaining accuracy.
Solution Approach 2:
The patent creates standardized calibration profiles that can be copied and applied to multiple devices with similar configurations. Instead of calibrating each device individually, pre-established calibration profiles are retrieved and applied, significantly reducing deployment complexity.
2Reliability
If individual device calibration is implemented, then synchronization accuracy improves, but the time and resources required for calibration increase
Solution Approach 1:
Calibration data is prepared in advance during laboratory testing for various device combinations. This preliminary calibration eliminates the need for time-consuming field calibration, allowing devices to be deployed immediately with pre-determined calibration profiles.
Solution Approach 2:
The patent creates universal calibration profiles that can be applied across multiple device types and combinations. A single calibration profile can serve multiple devices with similar configurations, reducing the overall calibration time and resources required.
3Speed
If DTP calibration data is stored locally on each device, then access speed improves, but the ability to update and manage calibration data across the network decreases
Solution Approach 1:
The patent introduces a calibration management server as an intermediary between the central database and field devices. The server caches calibration data locally for fast access while maintaining the ability to retrieve updated profiles from the central database, balancing speed and manageability.
Solution Approach 2:
The system implements a hierarchical storage approach where frequently accessed calibration data is cached locally on devices for fast access, while the central database maintains the master copy for updates and management. This local-quality approach optimizes both access speed and manageability.
Data Source
AI summary
Systems and methods implement Data-Over-Cable Service Interface Specification (DOCSIS) time protocol (DTP) calibration. A testing laboratory measures a DTP timing error for a test configuration representative of a DOCSIS network to determine DTP calibration data. The DTP calibration data is stored in association with a DTP calibration testing setup of the DOCSIS network in a DTP calibration platform. An operational cable modem termination system (CMTS) conforming to the DTP calibration testing setup retrieves and applies the DTP calibration data from the DTP calibration platform based on the DTP calibration testing setup.