Evaluating Sub Gigahertz Spreading Factors against Cellular Coverage Enhancement Energy Costs
Sub-GHz LoRaWAN spreading factors consume less baseline battery energy than NB-IoT coverage enhancement repetitions in deep indoor deployments.
Power Class 3 Vs Class 5
Meaning
Operational transmitter power designations classify cellular devices by their maximum radiated output power to match different regional and applications requirements. Designing for power class 3 vs class 5 represents a choice between a stronger 23 decibel-milliwatt transmitter and a more modest 20 decibel-milliwatt option. This decision determines both the layout complexity and the regulatory certification track of the finished board.
It shapes the initial board schematic from the earliest concept phase.
Current Consumption
Current draw spikes during active uplink intervals if the higher power class is utilized. Selecting power class 3 vs class 5 changes the thermal profile of the unit and the necessary decoupling capacitor array. Battery-operated products often choose the lower class to protect their cell chemistry.
Range Tradeoff
The reduced output of the lower power class reduces the communication range. Devices in remote locations need the higher class to reach distant base stations.
Coexistence Margin
Board integration becomes difficult when higher transmit power creates electromagnetic interference with adjacent sensors. Selecting power class 3 vs class 5 affects the shielding requirements of the enclosure. Co-located radio modules require higher filtering attenuation when the higher transmit power is deployed.
System integrators must verify receiver desensitization to prevent internal crosstalk from disabling the download path.