Low power and long-range communications are crucial features of the Internet of Things (IoT) paradigm that is becoming essential even for industrial applications. Today, the most promising long-range communication technologies are LoRaWAN and Narrow Band IoT (NB-IoT), which are driving a large IoT ecosystem. In this paper, we evaluate the performance of LoRaWAN and NB-IoT with accurate in-field measurements using the same application context for a fair comparison in terms of energy efficiency, lifetime, quality of service, and coverage. The NB-IoT energy transmission is scarcely dependent on the payload length. Thus applications that can tolerate buffering and caching techniques on the node are favored. On the other hand, LoRaWAN consumes 10× lower energy compared to NB-IoT for occasional and latency-sensitive communications, for which it enables much end-device lifetime. Finally, this paper provides design guidelines for future industrial applications with stringent requirements of long-range and low power wireless connectivity.

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A b stra ct-W ireless w earab le sen sors have developed rap id ly in recen t y ears, p rim arily d riven b y e-h ealth , fitn ess and w elln ess a p p lication s. T he tech n ological evolu tion o f low p ow er m icro p rocessors is en ab lin g to p rocess d ata loca lly , savin g energy and bandw idth and in creasin g th e o verall through pu t o f the w ireless n etw ork. T h is p aper p resen ts a new gen eral-pu rp ose In ertia l M easure U n it th at exp loits a d ual-core arch itectu re. A core offers p rocessin g cap ab ility, and th e oth er on e is a rad io in terfa ce IE E E 8 02.15.4. We p rop ose th e w hole system and a p rotocol to m axim ize th e through pu t, redu ce th e p ack et lo ss and im prove th e rob u stn ess o f w ireless sen sor nodes com m unication. E xp erim en tal resu lts show th at our solu tion offers b etter data through pu t for con figurations b elow 10 nodes com pared to w id ely u sed com m ercial w ireless sen sor n od es. T he p ap er also p resen ts an exp erim en tal evalu ation o f sca la b ility (up to 10 n odes) and p ow er con su m p tion o f th e p roposed solu tion . In d ex Terms-W ireless S en sor N etw ork, In ertia l M easurem ent U n its, M otion C apture, tim e-triggered p rotocol I. I n t r o d u c t i o n

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