Mobile networks architecturally are different from fixed networks. A mobile network is supposed to provider coverage outdoors and indoors. A fixed network is supposed to provide connectivity to the side of a building, with indoor coverage being a private network (Wi-Fi for indoor distribution).
But as radio frequencies are higher, their ability to provide good coverage indoors decreases. So, in many ways, the traditional "mobile" architecture starts to resemble the traditional fixed network model: private networks owned by customers or third parties for indoor connectivity; access and transport provided by the mobile service provider.
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