64 ||| 1556-6072/16©2016IEEE IEEE VEHICULAR TECHNOLOGY MAGAZINE | MARCH 2016 Digital Object Identifier 10.1109/MVT.2015.2496240 Date of publication: 1 February 2016 T here has been active research worldwide to develop the next-genera- tion, i.e., fifth-generation (5G), wireless network. The 5G network is expected to support a significantly large amount of mobile data traffic and a huge number of wireless connections and achieve better cost- and energy-efficiency as well as quality of service (QoS) in terms of communi- cation delay, reliability, and security. To this end, the 5G wireless network should exploit the potential of new developments, including superdense and heterogeneous deployment of cells and massive antenna arrays [i.e., massive Potential Benefits and Challenges Tadilo Endeshaw Bogale and Long Bao Le IMAGES LICENSED BY INGRAM PUBLISHING Massive MIMO and mmWave for 5G Wireless HetNet