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There have been active research activities worldwide in developing thenext-generation 5G wireless network. The 5G network is expected to supportsignificantly large amount of mobile data traffic and huge number of wirelessconnections, achieve better cost- and energy-efficiency as well as quality ofservice (QoS) in terms of communication delay, reliability and security. Tothis end, the 5G wireless network should exploit potential gains in differentnetwork dimensions including super dense and heterogeneous deployment of cellsand massive antenna arrays (i.e., massive multiple input multiple output (MIMO)technologies) and utilization of higher frequencies, in particular millimeterwave (mmWave) frequencies. This article discusses potentials and challenges ofthe 5G heterogeneous wireless network (HetNet) which incorporates massive MIMOand mmWave technologies. We will first provide the typical requirements of the5G wireless network. Then, the significance of massive MIMO and mmWave inengineering the future 5G HetNet is discussed in detail. Potential challengesassociated with the design of such 5G HetNet are discussed. Finally, we providesome case studies, which illustrate the potential benefits of the consideredtechnologies.

Massive MIMO and Millimeter Wave for 5G Wireless HetNet: Potentials and Challenges