{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T03:57:33Z","timestamp":1760241453064,"version":"build-2065373602"},"reference-count":37,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2018,4,12]],"date-time":"2018-04-12T00:00:00Z","timestamp":1523491200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>A common concern in smart cities is the focus on sensing procedures to provide city-wide information to city managers and citizens. To meet the growing demands of smart cities, the network must provide the ability to handle a large number of mobile sensors\/devices, with high heterogeneity and unpredictable mobility, by collecting and delivering the sensed information for future treatment. This work proposes a multi-wireless technology communication platform for opportunistic data gathering and data exchange with respect to smart cities. Through the implementation of a proprietary long-range (LoRa) network and an urban sensor network, our platform addresses the heterogeneity of Internet of Things (IoT) devices while conferring communications in an opportunistic manner, increasing the interoperability of our platform. It implements and evaluates a medium access communication (MAC) protocol for LoRa networks with multiple gateways. It also implements mobile Opportunistic VEhicular (mOVE), a delay-tolerant network (DTN)-based architecture to address the mobility dimension. The platform provides vehicle-to-everything (V2X) communication with support for highly reliable and actionable information flows. Moreover, taking into account the high mobility pattern that a smart city scenario presents, we propose and evaluate two forwarding strategies for the opportunistic sensor network.<\/jats:p>","DOI":"10.3390\/s18041184","type":"journal-article","created":{"date-parts":[[2018,4,12]],"date-time":"2018-04-12T12:19:27Z","timestamp":1523535567000},"page":"1184","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["A Multi-Technology Communication Platform for Urban Mobile Sensing"],"prefix":"10.3390","volume":"18","author":[{"given":"Rodrigo","family":"Almeida","sequence":"first","affiliation":[{"name":"Instituto de Telecomunica\u00e7\u00f5es, 3810-193 Aveiro, Portugal"}]},{"given":"Rui","family":"Oliveira","sequence":"additional","affiliation":[{"name":"Instituto de Telecomunica\u00e7\u00f5es, 3810-193 Aveiro, Portugal"},{"name":"Departamento de Eletr\u00f3nica, Telecomunica\u00e7\u00f5es e Inform\u00e1tica, University of Aveiro, 3810-193 Aveiro, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3488-2462","authenticated-orcid":false,"given":"Miguel","family":"Lu\u00eds","sequence":"additional","affiliation":[{"name":"Instituto de Telecomunica\u00e7\u00f5es, 3810-193 Aveiro, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6791-4291","authenticated-orcid":false,"given":"Carlos","family":"Senna","sequence":"additional","affiliation":[{"name":"Instituto de Telecomunica\u00e7\u00f5es, 3810-193 Aveiro, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8761-8281","authenticated-orcid":false,"given":"Susana","family":"Sargento","sequence":"additional","affiliation":[{"name":"Instituto de Telecomunica\u00e7\u00f5es, 3810-193 Aveiro, Portugal"},{"name":"Departamento de Eletr\u00f3nica, Telecomunica\u00e7\u00f5es e Inform\u00e1tica, University of Aveiro, 3810-193 Aveiro, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2018,4,12]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"431","DOI":"10.1016\/j.bushor.2015.03.008","article-title":"The Internet of Things (IoT): Applications, investments, and challenges for enterprises","volume":"58","author":"Lee","year":"2015","journal-title":"Bus. Horiz."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"22","DOI":"10.1109\/JIOT.2014.2306328","article-title":"Internet of things for smart cities","volume":"1","author":"Zanella","year":"2014","journal-title":"IEEE Int. Things J."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"81","DOI":"10.1002\/ett.2704","article-title":"Sensing as a service model for smart cities supported by internet of things","volume":"25","author":"Perera","year":"2014","journal-title":"Trans. Emerg. Telecommun. Technol."},{"key":"ref_4","doi-asserted-by":"crossref","unstructured":"Pellicer, S., Santa, G., Bleda, A.L., Maestre, R., Jara, A.J., and Skarmeta, A.G. (2013, January 3\u20135). A global perspective of smart cities: A survey. Proceedings of the 2013 Seventh International Conference on Innovative Mobile and Internet Services in Ubiquitous Computing, Taichung, Taiwan.","DOI":"10.1109\/IMIS.2013.79"},{"key":"ref_5","first-page":"473","article-title":"Sensor fusion for public space utilization monitoring in a smart city","volume":"5","author":"Billy","year":"2017","journal-title":"IEEE Int. Things J."},{"key":"ref_6","doi-asserted-by":"crossref","unstructured":"Giannini, C., Calegari, P., Buratti, C., and Verdone, R. (2016, January 5\u20137). Delay Tolerant Network for smart city: Exploiting bus mobility. Proceedings of the AEIT International Annual Conference (AEIT), 2016, Capri, Italy.","DOI":"10.23919\/AEIT.2016.7892779"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"1166","DOI":"10.1109\/SURV.2011.081611.00102","article-title":"From delay-tolerant networks to vehicular delay-tolerant networks","volume":"14","author":"Pereira","year":"2012","journal-title":"IEEE Commun. Surv. Tutor."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"60","DOI":"10.1109\/MWC.2016.7721743","article-title":"Long-range communications in unlicensed bands: The rising stars in the IoT and smart city scenarios","volume":"23","author":"Centenaro","year":"2016","journal-title":"IEEE Wirel. Commun."},{"key":"ref_9","unstructured":"Sforza, F. (2013). Communications System, 2013. (8,406,275), U.S. Patent."},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Oliveira, R., Guardalben, L., and Sargento, S. (2017, January 3\u20136). Long Range Communications in Urban and Rural Environments. Proceedings of the 2017 IEEE Symposium on Computers and Communications (ISCC), Heraklion, Greece.","DOI":"10.1109\/ISCC.2017.8024627"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"217","DOI":"10.1016\/j.bjp.2013.12.020","article-title":"SmartSantander: IoT experimentation over a smart city testbed","volume":"61","author":"Sanchez","year":"2014","journal-title":"Comput. Netw."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"14309","DOI":"10.1109\/ACCESS.2017.2723659","article-title":"Practical Lessons From the Deployment and Management of a Smart City Internet-of-Things Infrastructure: The SmartSantander Testbed Case","volume":"5","author":"Sotres","year":"2017","journal-title":"IEEE Access"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"785061","DOI":"10.1155\/2015\/785061","article-title":"Large-scale mobile sensing enabled internet-of-things testbed for smart city services","volume":"11","author":"Lanza","year":"2015","journal-title":"Int. J. Distrib. Sens. Netw."},{"key":"ref_14","doi-asserted-by":"crossref","unstructured":"Latre, S., Leroux, P., Coenen, T., Braem, B., Ballon, P., and Demeester, P. (2016, January 12\u201315). City of things: An integrated and multi-technology testbed for IoT smart city experiments. Proceedings of the 2016 IEEE International Smart Cities Conference (ISC2), Trento, Italy.","DOI":"10.1109\/ISC2.2016.7580875"},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Braem, B., Latre, S., Leroux, P., Demeester, P., Coenen, T., and Ballon, P. (2016, January 12\u201315). Designing a smart city playground: Real-time air quality measurements and visualization in the City of Things testbed. Proceedings of the 2016 IEEE International Smart Cities Conference (ISC2), Trento, Italy.","DOI":"10.1109\/ISC2.2016.7580871"},{"key":"ref_16","doi-asserted-by":"crossref","unstructured":"Luis, Y., Santos, P.M., Lourenco, T., P\u00e9rez-Penichet, C., Calcada, T., and Aguiar, A. (2016, January 12\u201315). UrbanSense: An urban-scale sensing platform for the Internet of Things. Proceedings of the 2016 IEEE International Smart Cities Conference (ISC2), Trento, Italy.","DOI":"10.1109\/ISC2.2016.7580869"},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Petri\u0107, T., Goessens, M., Nuaymi, L., Toutain, L., and Pelov, A. (2016, January 4\u20138). Measurements, Performance and Analysis of LoRa FABIAN, a real-world implementation of LPWAN. Proceedings of the 2016 IEEE 27th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), Valencia, Spain.","DOI":"10.1109\/PIMRC.2016.7794569"},{"key":"ref_18","first-page":"323","article-title":"Sensing the air we breathe-the opensense zurich dataset","volume":"1","author":"Li","year":"2012","journal-title":"Proc. Natl. Conf. Artif. Intell."},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Bharadwaj, A.S., Rego, R., and Chowdhury, A. (2016, January 16\u201318). IoT based solid waste management system: A conceptual approach with an architectural solution as a smart city application. Proceedings of the 2016 IEEE Annual India Conference (INDICON), Bangalore, India.","DOI":"10.1109\/INDICON.2016.7839147"},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Saravanan, M., Das, A., and Iyer, V. (2017, January 6\u20139). Smart water grid management using LPWAN IoT technology. Proceedings of the 2017 Global Internet of Things Summit (GIoTS), Geneva, Switzerland.","DOI":"10.1109\/GIOTS.2017.8016224"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"222","DOI":"10.1109\/SURV.2010.020510.00058","article-title":"MAC essentials for wireless sensor networks","volume":"12","author":"Bachir","year":"2010","journal-title":"IEEE Commun. Surv. Tutor."},{"key":"ref_22","doi-asserted-by":"crossref","unstructured":"Zhang, K., and Marchiori, A. (2017, January 13\u201317). Crowdsourcing low-power wide-area IoT networks. Proceedings of the 2017 IEEE International Conference on Pervasive Computing and Communications (PerCom), Kona, HI, USA.","DOI":"10.1109\/PERCOMW.2017.7917608"},{"key":"ref_23","unstructured":"Alliance, L. (2018, February 02). White paper: LoRaWAN: A Technical Overview of LoRa and LoRaWAN. Available online: http:\/\/docs.wixstatic.com\/ugd\/eccc1a_ed71ea1cd969417493c74e4a13c55685.pdf."},{"key":"ref_24","unstructured":"Bor, M., Vidler, J., and Roedig, U. (2018, February 02). LoRa for the Internet of Things. Available online: http:\/\/eprints.lancs.ac.uk\/77615\/."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"46","DOI":"10.1109\/MNET.2016.7437024","article-title":"A performance comparison of delay-tolerant network routing protocols","volume":"30","author":"Abdelkader","year":"2016","journal-title":"IEEE Netw."},{"key":"ref_26","first-page":"8","article-title":"Routing approaches in delay tolerant networks: A survey","volume":"1","author":"Jose","year":"2010","journal-title":"Int. J. Comput. Appl."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"141","DOI":"10.1016\/j.comcom.2014.03.024","article-title":"Routing protocols in vehicular delay tolerant networks: A comprehensive survey","volume":"48","author":"Benamar","year":"2014","journal-title":"Comput. Commun."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"128","DOI":"10.1016\/j.jnca.2016.01.002","article-title":"A survey of routing and data dissemination in delay tolerant networks","volume":"67","author":"Sobin","year":"2016","journal-title":"J. Netw. Comput. Appl."},{"key":"ref_29","unstructured":"Vahdat, A., and Becker, D. (2018, February 02). Available online: http:\/\/issg.cs.duke.edu\/epidemic\/epidemic.pdf."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"2416","DOI":"10.1002\/dac.3030","article-title":"Probabilistic routing algorithm based on contact duration and message redundancy in delay tolerant network","volume":"29","author":"Yu","year":"2016","journal-title":"Int. J. Commun. Syst."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"102","DOI":"10.1016\/j.inffus.2011.11.003","article-title":"GeoSpray: A geographic routing protocol for vehicular delay-tolerant networks","volume":"15","author":"Soares","year":"2014","journal-title":"Inf. Fusion"},{"key":"ref_32","doi-asserted-by":"crossref","unstructured":"Lin, C.Y., Chung, J.Y., Li, C.T., Hu, C.L., and Lien, Y.N. (2017, January 1\u20134). Geo-Routing with angle-based decision in delay-tolerant networks. Proceedings of the 2017 10th International Conference on Ubi-media Computing and Workshops (Ubi-Media), Pattaya, Thailand.","DOI":"10.1109\/UMEDIA.2017.8074152"},{"key":"ref_33","doi-asserted-by":"crossref","unstructured":"De Andrade, G.E., de Paula Lima, L.A., Calsavara, A., and Maziero, C.A. (2013, January 25\u201328). Routing protocol based on the position, velocity, and direction of the nodes. Proceedings of the 2013 27th International Conference on Advanced Information Networking and Applications Workshops, Barcelona, Spain.","DOI":"10.1109\/WAINA.2013.138"},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"2181","DOI":"10.1109\/TVT.2011.2147342","article-title":"Delque: A socially aware delegation query scheme in delay-tolerant networks","volume":"60","author":"Fan","year":"2011","journal-title":"IEEE Trans. Veh. Technol."},{"key":"ref_35","unstructured":"(2017, May 31). Cooking Hacks LoRa 868 \/ 900MHz SX1272 LoRa Module for Arduino Waspmote and Raspberry Pi. Available online: http:\/\/www.cooking-hacks.com\/documentation\/tutorials\/extreme-range-lora-sx1272-module-shield-arduino-raspberry-pi-intel-galileo."},{"key":"ref_36","doi-asserted-by":"crossref","unstructured":"Almeida, R., Oliveira, R., Sousa, D., Luis, M., Senna, C., and Sargento, S. (2017, January 4\u20138). A Multi-Technology Opportunistic Platform for Environmental Data Gathering on Smart Cities. Proceedings of the 2017 IEEE Globecom Workshops (GC Wkshps), Singapore.","DOI":"10.1109\/GLOCOMW.2017.8269110"},{"key":"ref_37","doi-asserted-by":"crossref","unstructured":"Pessoa, G., Dias, R., Condeixa, T., Azevedo, J., Guardalben, L., and Sargento, S. (2017, January 29\u201331). New Insights on Content Distribution Emulation for Vehicular Networks. Proceedings of the Wireless Days Conference, Porto, Portugal.","DOI":"10.1109\/WD.2017.7918146"}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/18\/4\/1184\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T15:00:30Z","timestamp":1760194830000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/18\/4\/1184"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2018,4,12]]},"references-count":37,"journal-issue":{"issue":"4","published-online":{"date-parts":[[2018,4]]}},"alternative-id":["s18041184"],"URL":"https:\/\/doi.org\/10.3390\/s18041184","relation":{},"ISSN":["1424-8220"],"issn-type":[{"type":"electronic","value":"1424-8220"}],"subject":[],"published":{"date-parts":[[2018,4,12]]}}}