Question : LoRa/LoRaWAN number of device

CongducPham / LowCostLoRaGw

Low-cost LoRa IoT & gateway with SX12XX (SX1261/62/68; SX1272/76/77/78/79; SX1280/81), RaspberryPI and Arduino boards

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Question : LoRa/LoRaWAN number of device #228

Open AntoineGirafe opened 5 years ago

AntoineGirafe commented 5 years ago

Hi there,

There is my question : How much device can LowCostLoRaGW manage ? I mean if I want 200 devices to transmit at the same time how much messages will be received by the gateway ? How does it works ? What are the limits ? (I'm using an SX1272 module for now, but I could use an RN2483A module too)

Is the LoRaWAN protocole any better to manage that number of end device ?

Thanks a lot for your help

AntoineGirafe

CongducPham commented 5 years ago

Sorry for my late answer.

A gateway can easily manage several hundreds of devices as the load should be low, e.g. 1 message every hour from each end-devices. Normally, it is not adviced to have all your devices transmitting at the same time as there will be collisions. We have integrated CSMA (carrier sense) mechanism at end-device but it is also better to perform device randomization, meaning that the interval between 2 transmission adds a random part. Currently, the limit is 254 devices as address 0 and 1 are reserved.