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Sensors 2016, 16(6), 836;

Energy Efficient IoT Data Collection in Smart Cities Exploiting D2D Communications

DIIES Department, University Mediterranea of Reggio Calabria, Reggio Calabria 89100, Italy
Centre Technològic de Telecommunications de Catalunya (CTTC), Barcelona 08860, Spain
Author to whom correspondence should be addressed.
Academic Editors: Andrea Zanella and Toktam Mahmoodi
Received: 17 March 2016 / Revised: 27 May 2016 / Accepted: 1 June 2016 / Published: 8 June 2016
(This article belongs to the Special Issue Smart City: Vision and Reality)
Full-Text   |   PDF [10062 KB, uploaded 8 June 2016]   |  


Fifth Generation (5G) wireless systems are expected to connect an avalanche of “smart” objects disseminated from the largest “Smart City” to the smallest “Smart Home”. In this vision, Long Term Evolution-Advanced (LTE-A) is deemed to play a fundamental role in the Internet of Things (IoT) arena providing a large coherent infrastructure and a wide wireless connectivity to the devices. However, since LTE-A was originally designed to support high data rates and large data size, novel solutions are required to enable an efficient use of radio resources to convey small data packets typically exchanged by IoT applications in “smart” environments. On the other hand, the typically high energy consumption required by cellular communications is a serious obstacle to large scale IoT deployments under cellular connectivity as in the case of Smart City scenarios. Network-assisted Device-to-Device (D2D) communications are considered as a viable solution to reduce the energy consumption for the devices. The particular approach presented in this paper consists in appointing one of the IoT smart devices as a collector of all data from a cluster of objects using D2D links, thus acting as an aggregator toward the eNodeB. By smartly adapting the Modulation and Coding Scheme (MCS) on the communication links, we will show it is possible to maximize the radio resource utilization as a function of the total amount of data to be sent. A further benefit that we will highlight is the possibility to reduce the transmission power when a more robust MCS is adopted. A comprehensive performance evaluation in a wide set of scenarios will testify the achievable gains in terms of energy efficiency and resource utilization in the envisaged D2D-based IoT data collection. View Full-Text
Keywords: smart city; internet of things; LTE-A; Device-to-Device communications; power control; small data transmission smart city; internet of things; LTE-A; Device-to-Device communications; power control; small data transmission

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Orsino, A.; Araniti, G.; Militano, L.; Alonso-Zarate, J.; Molinaro, A.; Iera, A. Energy Efficient IoT Data Collection in Smart Cities Exploiting D2D Communications. Sensors 2016, 16, 836.

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