1. I Hwang, B Song, SS Soliman, A holistic view on hyper-dense heterogeneous and small cell networks. IEEE Commun. Mag. 51, 20–27 (2013). doi:10.1109/MCOM.2013.6525591.
2. IS Gaspar, G Wunder, 5G Cellular communications scenarios and system requirements. Technical report. [Online, last accessed 2014-10-01] https://www.5gnow.eu .
3. JG Andrews, S Buzzi, W Choi, S Hanly, A Lozano, ACK Soong, JC Zhang, What will 5G be?IEEE J. Sel. Areas Commun., Special Issue on 5G Commun. Syst. 32(6), 1065–1081 (2014). doi:10.1109/JSAC.2014.2328098.
4. P Popovski, V Braun, H-P Mayer, P Fertl, DG-S Zhe Ren, E Ström, T Svensson, H Taoka, P Agyapong, A Benjebbour, G Zimmermann, J Meinilä, J Ylitalo, T Jämsä, P Kyösti, K Dimou, M Fallgren, Y Selen, B Timus, H Tullberg, M Schellmann, Y Wu, M Schubert, DH Kang, JI Markendahl, C Beckman, M Uusitalo, O Yilmaz, C Wijting, Z Li, et al., ICT-317669-METIS/ D1.1 Scenarios, requirements and KPIs for 5G mobile and wireless system. Technical report. [Online, last accessed 2014-10-01] https://www.metis2020.com .
5. 3GPP TR 36.836, Technical specification group radio access network: mobile relay for evolved universal terrestrial radio access (E-UTRA). Technical report. [Online, last accessed 2014-10-01] http://www.3gpp.org .