ABSTRACT
Contents 8.1 Introduction to SONs .............................................................................. 151
8.1.1 SON Architecture ......................................................................... 152 8.1.2 SON before 5G ............................................................................. 153
8.1.2.1 SON in Global System for Mobile Communications and Universal Mobile Telecommunications System ........ 153
8.1.2.2 SON in 3GPP ................................................................. 153 8.1.2.3 SON in 4G .....................................................................154
