Titlebook: User-Centric Ultra-Dense Networks for 5G; Shanzhi Chen,Fei Qin,Jiamin Liu Book 2018 The Author(s) 2018 User-Centric Ultra-Dense Networks (

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Security,DN, we define five the security domains, as shown in Fig. 6.1. The six security domains includes: (1), AP access security (2) APG organization security, (3) UE to UUDN access network security, (4) UE to UUDN core network security, (5) Network domain security.