LoRa Duty Cycle Ceilings That Decide Payload Frequency
LoRa duty cycle ceilings restrict packet frequency by limiting hourly transmission airtime, forcing trade-offs between spreading factor, payload size, and battery life.
Receive Window
Meaning
Scheduled time intervals define when a wireless device activates its radio receiver to listen for incoming messages from a gateway. The receive window is usually timed to follow an uplink transmission, allowing the network to send an acknowledgment or a command back to the node. This method ensures that the device only consumes power for receiving when it expects a response.
Timing Offset
Protocol specifications define the exact delay between the end of a transmission and the opening of the first receive window. Accurate internal clocks are required to ensure that the device wakes up at the correct moment.
Battery Conservation
Keeping the radio in a low power sleep mode between these windows is the primary way that smart devices extend their operational life. Short windows minimize the time the receiver is active while still providing a reliable path for downlink communication.
Protocol Handshake
If a gateway has data for a node, it must send the packet within the boundaries of this scheduled interval. A second window may be opened if the first one does not result in a successful reception. This structured approach to communication reduces the likelihood of missed messages and allows for efficient management of many nodes by a single gateway.