Hybrid Network for Battery Powered IoT Endpoint Communications
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Solution Overview
Problem
Battery-powered IoT devices face significant power consumption issues when frequently establishing and maintaining cellular links, leading to reduced battery life and increased operational overhead, as they need to report metrology data regularly and respond to on-demand read requests.
Innovation Solution
A hybrid network system where nodes establish cellular links intermittently and form low-power wireless mesh links to conserve energy, allowing them to communicate with the back office as needed without frequent cellular link establishment or continuous active links, using a combination of cellular and mesh networks to manage data transmission and on-demand read requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If battery-powered IoT devices frequently establish and maintain cellular links to report metrology data and respond to on-demand read requests, then communication reliability and responsiveness are improved, but power consumption increases and battery life decreases
Solution Approach 1:
The system dynamically adapts communication behavior based on operational context. Battery-powered nodes switch between mesh network mode (for routine data reporting) and cellular link mode (for on-demand read requests or critical communications). This dynamic adaptation allows the system to maintain communication reliability while optimizing power consumption by using the lower-power mesh network for routine operations and reserving cellular links for necessary communications.
Solution Approach 2:
Instead of maintaining continuous cellular links, the system implements periodic cellular link establishment only when needed. Battery-powered nodes establish cellular links intermittently for specific purposes (such as responding to on-demand read requests or periodic bulk data transfers) rather than maintaining continuous connections. This periodic action significantly reduces power consumption while maintaining necessary communication capabilities.
2Loss of time
If battery-powered IoT devices maintain active cellular links at all times to enable on-demand read requests, then responsiveness to on-demand requests is improved, but battery life is substantially reduced
Solution Approach 1:
The mesh network acts as an intermediary layer between battery-powered nodes and the back office. When on-demand read requests are received, the system uses the mesh network to relay requests and data between nodes and the back office, eliminating the need for continuous cellular link maintenance. This intermediary approach maintains responsiveness while dramatically reducing power consumption by avoiding frequent cellular radio activations.
Solution Approach 2:
The system performs preliminary actions by establishing mesh network connections in advance and maintaining them continuously at low power. This allows the mesh network to be ready for immediate data transfer when cellular links are intermittently established, reducing the latency for on-demand requests without requiring continuous cellular connectivity. The mesh network infrastructure is prepared beforehand to handle communications during cellular link availability windows.
3Productivity
If battery-powered IoT devices establish cellular links frequently to report metrology data regularly, then data reporting frequency is improved, but operational overhead increases due to battery replacements
Solution Approach 1:
The communication architecture is segmented into two distinct layers: a low-power mesh network layer for routine data reporting and an intermittent cellular link layer for bulk transfers and on-demand requests. This segmentation allows battery-powered nodes to report metrology data frequently through the mesh network without incurring the high power costs of frequent cellular link establishment. The operational overhead is reduced because the mesh network handles routine communications autonomously without requiring battery replacements.
Data Source
AI summary
Nodes included in a hybrid network establish cellular links infrequently and at staggered intervals. When a node establishes a cellular link, other nodes can transmit and receive data to a back office using that cellular link. In addition, the node can receive a request from the back office across the cellular link indicating that another node should respond to an on-demand read request. The node can then signal the other node via a wireless mesh network to establish a cellular link in order to respond to the on-demand read request. An advantage of the disclosed approach is that a battery powered node can communicate as often as needed with the back office without frequently establishing a cellular link and without maintaining a continuously active cellular link.