1. [1] Cisco White Paper, “Cisco visual networking index: Global mobile data traffic forecast,” 2009-2014 reports.
2. [2] Report ITU-R M.2243 (IMT.UPDATE), WP5D, 2011.
3. [3] Ministry of Internal Affairs and Communications, Japan, “Mobile communication traffic in Japan,” Data base of ICT statistics, Dec. 2014.
4. [4] V. Vakilian, T. Wild, F. Schaich, S. ten Brink, and J.-F. Frigon, “Universal-filtered multi-carrier technique for wireless systems beyond LTE,” 2013 IEEE Globecom Workshops (GC Wkshps), pp.223-228, 2013.
5. [5] DOCOMO Press Release, “DOCOMO to develop next-generation base stations utilizing advanced C-RAN architecture for LTE-Advanced,” Feb. 2013. https://www.nttdocomo.co.jp/english/info/media_center/pr/2013/0221_00.html