Network Apparatus Disconnection Detection via Staggered Monitoring
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Solution Overview
Problem
Conventional network systems face challenges in detecting the disconnection of apparatuses from the network in a timely manner without increasing network traffic, as frequent information transmission leads to heavy traffic, while infrequent transmission delays detection and compromises reliability.
Innovation Solution
Implementing a network system where monitoring apparatuses A and B receive information from monitored apparatuses at different timings, allowing apparatus B to determine the state based on both received information and state information from apparatus A, enabling early detection of disconnection without substantial network traffic increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the transmission frequency of information from monitored apparatus to monitoring apparatuses is increased, then the detection speed of apparatus disconnection is improved, but the network traffic becomes heavier
Solution Approach 1:
The monitored apparatus transmits state information in advance when it detects a state change (such as disconnection), allowing monitoring apparatuses to detect the disconnection earlier without waiting for the next scheduled information transmission cycle. This preliminary action resolves the contradiction by enabling faster detection without requiring increased transmission frequency.
Solution Approach 2:
The system implements a feedback mechanism where the monitored apparatus actively notifies monitoring apparatuses of state changes. This feedback loop allows the system to respond to actual disconnection events immediately rather than relying on periodic status checks, thereby improving detection speed without proportionally increasing network traffic.
2Quantity of substance
If the transmission frequency of information from monitored apparatus to monitoring apparatuses is decreased, then the network traffic is reduced, but the detection speed of apparatus disconnection becomes slower
Solution Approach 1:
Instead of waiting for the next scheduled transmission in a low-frequency system, the monitored apparatus performs a preliminary action by immediately transmitting state information when a disconnection occurs. This ensures that even with infrequent scheduled transmissions, the system can detect disconnections quickly when they actually happen.
Solution Approach 2:
The monitored apparatus autonomously detects its own state changes and initiates the transmission of state information without requiring external polling from monitoring apparatuses. This self-service approach allows the system to maintain low traffic while achieving fast detection, as transmissions occur only when necessary.
3Reliability
If multiple monitoring apparatuses receive information at the same timing, then the system complexity is reduced, but the early detection capability is compromised
Solution Approach 1:
The patent introduces a new dimension to the monitoring system by having multiple monitoring apparatuses operate at different timing cycles. Instead of all monitors checking at the same time, they check at staggered intervals, allowing at least one monitor to detect state changes earlier without significantly increasing overall system complexity.
Data Source
AI summary
In the present network system, a printer 10 periodically transmits an update request at different timings respectively to an apparatus management PC 30 and to a directory service 50 which are monitoring apparatuses for monitoring network apparatuses (such as the printer 10). Each of the monitoring apparatuses 30, 50 determines a state of the printer 10 based on the update request from the printer 10. Especially in the present system, if the apparatus management PC 30 determines that the update request from the printer 10 is not received, it notifies the directory service 50 by transmitting a delete request. As a result, early detection of disconnection of the printer 10 by the directory service 50 is possible without causing substantial increase in the network traffic.