Irrigation Hub Broadcast Scheduling for Low-Power Controller Sync
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Solution Overview
Problem
Current irrigation systems face challenges in optimizing water application timing and amount without waste, particularly in larger systems where multiple controllers need centralized management, and there is a need for efficient power management to maintain continuous operation.
Innovation Solution
A wireless network system comprising a network hub and remote terminal units connected to irrigation control devices, using wireless broadcasts with encoded parameters to synchronize states and manage device operations efficiently, minimizing power consumption and preventing collisions through unique indexing and modulation techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If centralized control is implemented for multiple irrigation controllers spread over wide areas, then system coordination and control precision are improved, but communication complexity and power consumption increase
Solution Approach 1:
The system uses periodic broadcast messages transmitted at scheduled intervals to update controller states. Remote terminal units enter sleep mode between broadcasts, waking only to receive updates. This periodic communication pattern maintains system coordination while dramatically reducing average power consumption compared to continuous monitoring.
Solution Approach 2:
Each remote terminal unit independently processes broadcast messages and autonomously determines when to wake and when to sleep based on its assigned wake time. The system distributes intelligence to individual units, eliminating the need for continuous centralized polling and reducing overall network power consumption.
2Speed
If continuous monitoring and communication are used to maintain controller activity, then system responsiveness is improved, but battery life and power efficiency deteriorate
Solution Approach 1:
The system achieves responsiveness through periodic broadcasts at predetermined intervals rather than continuous communication. Remote terminal units wake at assigned times to receive broadcast messages containing state information and wake time updates, then return to sleep mode. This maintains system responsiveness while extending battery life by minimizing active communication periods.
Solution Approach 2:
The broadcast messages contain feedback information about current system state and updated wake times. Remote terminal units use this feedback to adjust their wake schedules dynamically, ensuring they remain responsive to system changes while optimizing their power consumption based on actual system needs rather than operating on fixed schedules.
3Device complexity
If multiple controllers operate independently without synchronization, then device complexity is reduced, but system coordination and water application precision worsen
Solution Approach 1:
The system segments control functions by assigning each remote terminal unit a unique wake time and specific irrigation zones to manage. This segmentation allows simple, low-cost controller hardware while maintaining precise water application through coordinated operation. Each unit operates independently with simple logic but contributes to precise overall system control through its assigned functions.
Solution Approach 2:
The system uses parameter changes in broadcast messages to coordinate controllers, including wake time assignments and state information. By dynamically adjusting these parameters in periodic broadcasts, the system achieves precise water application timing and coordination without requiring complex hardware in individual controllers.
4Loss of information
If broadcast messages contain complete state information for all remote terminal units, then communication completeness is improved, but data transmission size and power consumption increase
Solution Approach 1:
Each remote terminal unit is assigned a specific wake time and processes only the portion of broadcast messages relevant to its assigned time slot and irrigation zones. The broadcast contains complete system state information, but individual units selectively process only their local portion, reducing effective data processing load and enabling efficient power management without losing necessary information.
Data Source
AI summary
An irrigation system includes a network hub and a plurality of remote terminal units configured for wireless communication with the network hub. The remote terminal units are connected to a device for irrigation control or sensing, such as a valve for a sprinkler. The network hub is configured to transmit a wireless broadcast to the remote terminal units, in which the wireless broadcast includes a plurality of individual packets transmitted in succession, each of the plurality of individual packets including a network identifier associated with the network hub, a time remaining in a broadcast period of time, and an assignment map indicative of an assigned state for each of the plurality of remote terminal units.