20 Oct '15, 5am

A Survey of Longer-Range #IoT Wireless Protocols

A Survey of Longer-Range #IoT Wireless Protocols

It’s not even clear what energy consumption should be compared. According to Telensa, “The only power consumption figures that count are… measured in [the] battery life [of edge nodes].” M2COMM’s Mr. Petitgrand notes that power efficiency can also differ: “LPWAN [protocols] use low power, but this actually translates to higher energy consumption than 2G when transferring the same amount of data . [emphasis in original]” The issue here is that lower transmit power means a slower data rate, which means it takes longer to transmit, which means you’re out of sleep mode for longer. Fainter signals due to low transmit power also require more sensitive receive circuits, which typically means more power.

Full article: http://www.eejournal.com/archives/articles/20150907-lpwa/

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