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Two are the main challenges that dense small cell networks are facing: a) various types of interference mainly caused by unplanned deployments, and b) limited and Quality of Service (QoS)-unreliable wired backhaul links. In this paper, the authors propose a model where femtocells' and relays' complementary characteristics are effectively exploited into femto-relays. More specifically, the authors describe four main functionalities of this model: a) interference protection, b) two-fold backhaul alternatives (i.e. wired and wireless backhaul), c) opportunistic femto-relay selection, and d) full-duplex in-band relaying. To evaluate the anticipated technical impact of the proposed model, targeted simulation results are presented for a campus topology where femto-relays are compared with classic femtocells. Finally, related open issues, such as signaling overheads management, context-aware resource management, and business logic aspects are presented, with emphasis on the femto-relay's real market penetration opportunities in the mid and long-term future.<\/p>","DOI":"10.4018\/ijwnbt.2015010104","type":"journal-article","created":{"date-parts":[[2015,3,28]],"date-time":"2015-03-28T21:35:08Z","timestamp":1427578508000},"page":"45-61","source":"Crossref","is-referenced-by-count":1,"title":["Wireless Femto-Relays"],"prefix":"10.4018","volume":"4","author":[{"given":"Nikolaos","family":"Nomikos","sequence":"first","affiliation":[{"name":"Department of Information and Communication Systems Engineering, University of the Aegean, Samos, Greece"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Prodromos","family":"Makris","sequence":"additional","affiliation":[{"name":"Computer Technology Institute, Kazantzaki, Greece"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dimitrios N.","family":"Skoutas","sequence":"additional","affiliation":[{"name":"Department of Information and Communication Systems Engineering University of the Aegean, Samos, Greece"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Demosthenes","family":"Vouyioukas","sequence":"additional","affiliation":[{"name":"Department of Information and Communication Systems Engineering University of the Aegean, Samos, Greece"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Charalambos","family":"Skianis","sequence":"additional","affiliation":[{"name":"Department of Information and Communication Systems Engineering, University of the Aegean, Samos, Greece"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"2432","reference":[{"key":"ijwnbt.2015010104-0","doi-asserted-by":"publisher","DOI":"10.1016\/j.phycom.2013.04.001"},{"key":"ijwnbt.2015010104-1","doi-asserted-by":"publisher","DOI":"10.1109\/TWC.2007.06020050"},{"key":"ijwnbt.2015010104-2","unstructured":"GPP, Technical Specifications Group Radio Access Network. 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