As voice revenues of operators are in sharp decline as a result of OTT voice service utilization in the all IP network, maintaining quality of mobile broadband services will be of strategic importance. Slow-down in revenue growth, spectrum limitations, and higher cost-per-bit in traditional macro-networks drive operators to seek new ways of expanding capacity and increasing revenue. One such method to tackle the capacity expansion problem is the “network densification”, which is also regarded as the crucial step towards 5G evolution. 

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