Optical Path Switching With Shared Line-Quality Measurement
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Solution Overview
Problem
There is no method for automatically setting an optical path using limited resources, particularly transmission quality measurement devices, when a carrier accommodates connection requests from user terminals.
Innovation Solution
An optical transmission system with a connection device and control device that includes a fixed number of measurement devices, a notification device, and a switching device, which allows for automatic optical path setting by temporarily connecting user terminals to a notification device when measurement devices are unavailable, and connecting them to measurement devices once available, after measuring transmission quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed number of measurement devices are used to measure transmission line quality, then the system cost is reduced and device complexity is lowered, but the ability to handle multiple connection requests simultaneously is limited
Solution Approach 1:
The notification device serves as an intermediary between user terminals and measurement devices. When measurement devices are unavailable, the notification device temporarily connects user terminals and notifies them of the busy state, allowing the system to accept and queue connection requests without requiring additional measurement devices. This mediator approach enables the system to handle more connection requests than the number of measurement devices while maintaining quality measurement capabilities.
2Measurement precision
If measurement devices are allocated to each connection request, then transmission quality measurement accuracy is ensured, but the quantity of measurement devices required increases system cost and complexity
Solution Approach 1:
The system dynamically allocates measurement devices to connection requests based on real-time availability and priority. Instead of static one-to-one allocation, the switching device dynamically connects user terminals to available measurement devices when needed, allowing the same measurement device to serve multiple connection requests sequentially. This dynamic allocation maintains measurement precision while reducing the total number of measurement devices required.
3Reliability
If the system waits for measurement device availability before accepting connection requests, then transmission quality measurement is ensured, but connection setup time increases and user experience deteriorates
Solution Approach 1:
The notification device performs preliminary actions by temporarily connecting user terminals and notifying them of measurement device availability status before actual quality measurement occurs. This allows the system to accept connection requests immediately without waiting for measurement device availability, while still ensuring that quality measurement will be performed when devices become available. The preliminary notification action reduces perceived waiting time while maintaining measurement reliability.
Data Source
AI summary
There is provided an optical transmission system including a connection device 1 and a control device 2. The connection device 1 includes a fixed number of measurement devices 12 that measure a quality of a transmission line between a user terminal 3 and the connection device, a notification device 13 that notifies the user terminal of busy information, and a switching device 11 that switches a connection destination of the user terminal 3 to any one of: one of the fixed number of the measurement devices 12; the notification device 13; and the optical transmission network. The control device 2 includes a control unit 21 that controls the switching device 11. The control unit 21 detects a connection request from the user terminal 3, and in a case where a measurement device 12 of the fixed number of measurement devices 12 is available, connects the user terminal 3 to the available measurement device 12, in a case where none of the fixed number of measurement devices 12 is available, temporarily connects the user terminal 3 to the notification device 13, and when a measurement device of the fixed number of measurement devices has become available, connects the user terminal 3 to the available measurement device 12, and after the quality of the transmission line is measured by the connected measurement device 12, connects the user terminal 3 to the optical transmission network.