Controllable Device Caching for Resource-Constrained Network Data
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Solution Overview
Problem
Resource-constrained devices in network systems, such as those used in automation and control networks, face challenges due to their limited power and communication capabilities, leading to inefficiencies and network congestion when trying to obtain and provide information, as they often require significant processing and network resources and may need to wait for wake-up periods to receive data.
Innovation Solution
A network system with a controllable device and a cache memory that stores data from resource-constrained devices, allowing the controllable device to transparently cache and provide data to requesting devices without the resource-constrained device needing to know about the cache, thereby reducing communication overhead and maintaining transparency for both the resource-constrained and requesting devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a resource-constrained device sends multiple requests to obtain information during its wake periods, then the requested information can be obtained, but network congestion and waste of processing resources occur
Solution Approach 1:
The requested information is cached in advance at the controllable device before the resource-constrained device needs it. When the resource-constrained device sends a request during its wake period, the controllable device can immediately provide the cached information without requiring the resource-constrained device to wait for the source device to wake up and respond, thus reducing multiple requests and network congestion.
Solution Approach 2:
The controllable device acts as an intermediary between the resource-constrained device and the information source. It maintains a cache of information and mediates requests by providing cached data to resource-constrained devices, reducing the need for direct communication with the source device and minimizing network traffic during wake periods.
2Use of energy by moving object
If a resource-constrained device waits for wake-up periods to receive data, then power consumption is reduced, but time delay and loss of information occur
Solution Approach 1:
The controllable device caches the requested information in advance, so when the resource-constrained device wakes up and sends a request, the data is already available immediately. This eliminates the waiting time that would otherwise occur until the source device wakes up and can respond, while the resource-constrained device still maintains its power-saving sleep schedule.
Solution Approach 2:
Instead of the resource-constrained device directly accessing the source device during wake periods, it receives copies of the information from the controllable device's cache. This copying mechanism allows rapid data retrieval without requiring the resource-constrained device to stay awake longer or wait for the source device's wake cycle.
3Loss of information
If a centralized access point caches data from resource-constrained devices, then data availability is improved, but device complexity and communication overhead increase
Solution Approach 1:
Each controllable device maintains its own local cache of information from resource-constrained devices it controls. This distributed caching approach allows each controllable device to serve requests independently without requiring a centralized access point, reducing communication overhead and distributing the system complexity across multiple simple, self-sufficient units.
Data Source
AI summary
A network system (100) for and a method of caching information from a resource-constrained device are provided. A resource-constrained device (110) provides via a network (130) generated data (d) that relates to a status of the resource-constrained device (110) to a controllable device (150) for controlling the controllable device (150). The controllable device (150) controls an operation of an operational component (154) in response to receiving the data (d). The controllable device (150) also comprises a cache memory (156) in which the received data (d) is stored and the controllable device (150) is configured to receive from a requesting device (170) a request (r) for the stored data (d) and is configured to provide the stored data (d) to the requesting device (170). The network system (100) provides a caching solution for the data (d) which is more transparent for the resource-constrained device (110).