Efficient and Flexible Solutions for 5G Wireless Network Security

The advanced features of 5G mobile wireless network systems yield new security requirements and challenges. In this dissertation, 5G wireless network security is studied to provide flexibility and efficiency. Current 5G wireless security solutions are studied based on physical layer security and cryptographic techniques. Security service requirements in 5G wireless networks are discussed. To achieve those requirements, a 5G wireless security architecture is studied. In particular, the overview of the proposed 5G wireless security architecture and corresponding security domains are studied. For physical layer security, a security analysis for an interference management mechanism in a two-tier heterogeneous network system is studied. The proposed interference management mechanism aims to maximize the secrecy rate of a cellular user under eavesdropping attack. Three different interferences are considered. The security analysis of the proposed interference management mechanism shows that some of the interferences can be utilized to improve the secrecy rate. Furthermore, cryptographic approaches based flexible and efficient security solutions are studied based on the proposed 5G wireless security architecture in this dissertation. Specifically, security protocols and schemes are proposed for flexible and efficient authentication and securing data transmission for IoT applications. A general IoT system architecture is studied with corresponding trust models. The security analysis shows the proposed scheme can achieve the design objectives. Moreover, the performance evaluation verifies the efficiency of the proposed scheme. In addition to IoT applications, a secure and efficient mobility management scheme over software-defined networking (SDN) - based 5G networks is studied. A new network architecture for heterogeneous networks (HetNets) is proposed. With the proposed network architecture, the proposed mobility management can be simplified and achieve higher efficiency. Three different handover scenarios and corresponding handover procedures are discussed. Full and fast authentication protocols are studied. In this dissertation, the overhead of the proposed scheme is analyzed. SDN is utilized for achieving global information sharing to reduce communication overhead. Finally, some of the open issues and research directions in 5G wireless security are pointed out in this dissertation