LoRaWAN Wireless Node Energy Control Using Credit Point Scheduling
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Solution Overview
Problem
Battery-powered wireless nodes in LoRaWAN networks face premature battery exhaustion due to uncontrollable energy consumption during bidirectional data transmission, particularly when receiving and processing downlink transmissions, which shortens their intended service life of ten years.
Innovation Solution
Implementing a credit point system that controls the wireless node's energy usage by managing uplink and downlink transmissions based on a credit point score, allowing the node to autonomously decide on energy-intensive activities, such as processing or sending data, to optimize energy consumption and extend battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless node receives and processes all downlink transmissions, then data communication completeness is improved, but energy consumption increases causing premature battery exhaustion
Solution Approach 1:
The wireless node selectively processes only certain downlink transmissions based on credit point availability, rather than processing all received downlinks. This partial action approach allows the node to maintain essential communication functionality while avoiding energy expenditure on non-critical data, thereby extending battery life without completely sacrificing communication reliability
Solution Approach 2:
The processing behavior of the wireless node is made dynamic through the credit point mechanism. The node adapts its processing decisions in real-time based on current credit point status, energy reserves, and communication priorities. This dynamic adjustment allows the system to optimize between reliability and energy consumption under varying operational conditions
2Reliability
If the wireless node opens receive windows frequently to ensure receiving downlink transmissions, then data reception reliability is improved, but energy consumption increases
Solution Approach 1:
The wireless node opens receive windows selectively rather than continuously or at every scheduled interval. By using the credit point system to determine when receive windows should be opened, the node performs the action partially - only when energy reserves and credit points justify the energy expenditure, thus maintaining essential data reception while reducing overall energy consumption
Solution Approach 2:
The wireless node checks credit point status before opening receive windows, performing a preliminary assessment of whether the action is justified. This preliminary action prevents unnecessary receive window openings that would consume energy without providing proportional communication benefit, thereby extending battery life while maintaining critical data reception
3Reliability
If the wireless node sends uplink transmissions to maintain network connectivity, then network connectivity is improved, but energy consumption increases reducing service life
Solution Approach 1:
The wireless node performs uplink transmissions partially - only when credit points are available and the transmission serves a critical purpose. Rather than maintaining continuous connectivity through regular uplinks, the node sends uplink transmissions selectively based on credit point status and network requirements, thus preserving essential connectivity while significantly reducing energy consumption to extend battery service life
Solution Approach 2:
The credit point system changes the parameter of transmission frequency and timing based on energy status. When credit points are low, the node reduces uplink transmission frequency and delays non-critical communications. This parameter change allows the system to adapt network connectivity behavior to energy availability, extending battery service life while maintaining essential network functionality
Data Source
AI summary
A method for energy management of a battery-powered wireless node for bidirectional data transmission in a long range wide area network (LoRaWAN) between the wireless node and a network server and/or an application server via at least one gateway. The wireless node goes into a transmit mode for an uplink transmission, and into a receive mode for receiving a downlink. The wireless node opens at least one receive window after an uplink transmission. On a basis of a credit point system during operation of the wireless node, a current sending or not-sending of an uplink transmission and/or a current processing or not-processing of a, preferably received, downlink transmission is controlled according to a credit point score of the credit point system of the wireless node.