Distributed Control System Adaptation for Mobile Detection Devices
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Solution Overview
Problem
In distributed control systems, the continuation of distributed processes is hindered when detection devices move, as notification devices cannot specify the new location of the moved detection device, leading to communication failures and negative acknowledgments without clear reasons, such as congestion or power issues.
Innovation Solution
The system implements a method where a first notification device stores acknowledgement information associating event identifiers with device identifiers when a negative acknowledgement is received, and upon subsequent requests, it determines if the event identifier is stored, deleting the associated device identifier to allow the distributed process to continue by updating the notification destination to the new location of the moved detection device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If notification devices use fixed device identifiers to track detection devices, then communication routing is simplified, but the system cannot adapt when detection devices move to new locations
Solution Approach 1:
The patent implements dynamic tracking by allowing device identifiers to change based on detection device location. When a detection device moves to a new notification device, the system updates the associated device identifier to reflect the new location, enabling continuous tracking without manual intervention
Solution Approach 2:
The system uses feedback mechanisms where notification devices report back to the management device when they detect changes in detection device locations. This feedback loop enables the management device to update tracking information and maintain accurate location data without constant polling
2Reliability
If the system continuously monitors detection device locations, then adaptability to movement is improved, but communication overhead and energy consumption increase
Solution Approach 1:
Instead of continuous monitoring, the system employs periodic location verification where the management device queries notification devices at intervals to check for changes in detection device locations. This periodic approach maintains reliability while significantly reducing energy consumption compared to continuous monitoring
Solution Approach 2:
The notification devices autonomously detect and report location changes without requiring constant active querying. When a detection device moves to a new notification device, the notification device automatically generates and sends an update to the management device, eliminating the need for continuous active monitoring
3Loss of information
If the system stores detailed acknowledgement information for all events, then traceability is improved, but storage requirements and processing time increase
Solution Approach 1:
The system extracts and stores only the essential device identifier information needed for tracking detection devices, rather than maintaining complete acknowledgement information for all events. This selective extraction reduces storage requirements and processing time while preserving the necessary traceability data
Data Source
AI summary
A distributed control method in a distributed control system including a process executed by a by a first notification device, the process including notifying a detection of a first event to a second notification device, storing, in a storage device, acknowledgement information associating an event identifier indicating the first event with a device identifier indicating the second notification device when a negative acknowledgement is received from the second notification device, determining whether the event identifier indicating the first event is stored in the storage device or not when a request for a notification of the detection of the first event is received from a third notification device, and deleting, from the storage device, a device identifier associated with the event identifier indicating the first event when it is determined that the event identifier indicating the first event is stored in the storage device.