Vending Machine Network Time Synchronization via Protocol Layering
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Solution Overview
Problem
Existing vending machine networks face challenges in synchronizing time-critical activities, such as coordinated lighting patterns and graphical content displays, due to network latency issues with logical network protocols like Zigbee, which are not sufficient for ensuring tight time synchronization across multiple machines.
Innovation Solution
The implementation of a network protocol using the Zigbee application layer to specify synchronized actions, combined with the 802.15.4 physical and media access control layers to distribute timing events, ensuring harmonious actuation of illumination elements and other coordinated activities across a bank of vending machines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If logical network protocols like Zigbee are used for vending machine networks, then ease of operation and device compatibility are improved, but time synchronization precision deteriorates due to network latency
Solution Approach 1:
The patent segments the network protocol into distinct layers: the application layer (Zigbee) handles high-level communication and coordination, while the physical and media access control layers (802.15.4) handle time-critical timing events. This segmentation allows each layer to optimize for its specific function without compromising the other.
Solution Approach 2:
The patent introduces an intermediary mechanism that bridges the application layer and the physical/MAC layers. This intermediary translates high-level synchronization requests from the application layer into precise timing events at the physical/MAC layer, ensuring accurate time synchronization while maintaining ease of operation through the Zigbee protocol.
2Manufacturing precision
If tight time synchronization is achieved across vending machines, then coordination of illumination and display activities is improved, but network complexity increases
Solution Approach 1:
The patent merges the timing functionality into the existing Zigbee network infrastructure by utilizing the physical and media access control layers that are already part of the standard protocol stack. This integration approach achieves tight time synchronization without adding separate complex timing hardware or protocols.
Solution Approach 2:
The patent makes the network protocol multi-functional by enabling it to handle both high-level application communication (through the application layer) and precise timing synchronization (through the physical and MAC layers) using a single integrated protocol stack, thereby avoiding the need for separate specialized systems.
Data Source
AI summary
Synchronization of activities requiring coordinated timing across a bank of vending machines, such as harmonious actuation of illumination elements, is performed by specifying, in an application layer (e.g., Zigbee) of a network protocol, actions to be synchronized to a distributed timing event and distributing notice of the specified timing event using physical and media access control layers of the network protocol.