Duty Cycle Control for Wireless Sensor Network Nodes
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Solution Overview
Problem
In wireless sensor networks, nodes often face energy constraints that limit their ability to transmit data continuously, requiring a trade-off between energy conservation and transmission delays, especially when using multi-hop paths, where coordination between nodes is necessary to optimize duty cycles.
Innovation Solution
A system that monitors data packets at a relay station, determines transmission parameters, and adjusts the duty cycle based on normalized parameters compared to set-point values, allowing for dynamic optimization of energy usage and transmission efficiency without requiring independent knowledge of data generation frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If nodes transmit data continuously, then transmission delays are reduced, but energy consumption increases
Solution Approach 1:
The duty cycle is dynamically adjusted based on real-time monitoring of data packet transmission patterns. The system transitions from static duty cycle configurations to adaptive duty cycles that respond to actual network conditions, optimizing the balance between energy consumption and transmission delay
Solution Approach 2:
The relay station monitors data packets from nodes and uses this feedback information to determine appropriate duty cycle adjustments. The system continuously observes transmission patterns and modifies duty cycles based on this feedback, creating a closed-loop control system that optimizes energy usage while maintaining acceptable delay performance
2Loss of time
If duty cycle is increased to reduce transmission delays, then energy consumption increases
Solution Approach 1:
The system changes the duty cycle parameter based on monitored transmission patterns. By adjusting this key parameter dynamically rather than using fixed values, the system optimizes the trade-off between transmission delay and energy loss according to actual network conditions
3Adaptability or versatility
If nodes use multi-hop paths to extend communication range, then transmission capability is improved, but coordination complexity increases
Solution Approach 1:
The relay station acts as an intermediary that centralizes the coordination function for multi-hop paths. Instead of requiring complex peer-to-peer coordination between multiple nodes, the relay station manages duty cycle adjustments, simplifying the coordination architecture while maintaining extended communication range
Data Source
Figure 1
Figure 2A~2C
Figure 3
AI summary
Data packets (122) from a network node (106) may be monitored at a relay station (104) associated with the network that is configured to forward the data packets (122) to a base station (102). The network node (106) may transmit the data packets (122) according to a first duty cycle. At least one transmission parameter associated with transmission of the data packets (122) from the network node (106) to the relay station (104) may be determined, and then may be related to at least one reference value (141) to obtain a normalized transmission parameter. The normalized transmission parameter may be compared to a set-point value (132), and a duty cycle change command (130) may be generated for the network node (106) to forward subsequent data packets (122) according to a second duty cycle, based on the comparison.