1. Astely D, Dahlman E, Furuskar A, Jading Y, Lindstrom M, Parkvall S (2009) LTE: the evolution of mobile broadband. IEEE Commun Mag 47(4):44–51
2. Bao VNQ, Thuan TD, Quy NT, Trung LM et al (2011) Vietnam spectrum occupancy measurements and analysis for cognitive radio applications. In: IEEE international conference on advanced technologies for communications (ATC), pp 135–143
3. Chen S, Wang Y, Ma W, Chen J (2012) Technical innovations promoting standard evolution: from TD- SCDMA to TD-LTE and beyond. IEEE Wirel Commun 19(1):60–66
4. Chen K, Min J, Han X, Yan X, Duan Y, Zhang L, Feng Z (2014) Spectrum survey for TV band in Beijing. In: IEEE international conference on telecommunications (ICT), pp 267–271
5. Contreras S, Villardi G, Funada R, Harada H (2011) An investigation into the spectrum occupancy in Japan in the context of TV white space systems. In: IEEE cognitive radio oriented wireless networks and communications (CROWNCOM), pp 341–345