Ultra-Dense Networks for 5G and Beyond

10Physical Layer Security for Ultra‐dense Networks under Unreliable Backhaul Connection

Huy T. Nguyen¹, Nam‐Phong Nguyen², Trung Q. Duong² and Won‐Joo Hwang¹

¹Department of Information and Communication Engineering, Inje University, South Korea

²School of Electronics, Electrical Engineering and Computer Science, Queen's University Belfast, UK

In the explosion of handsets and associated services, the demand for transferring information and communication tends to grow in an uncontrollable manner. To meet the requirements of reliable communications and high data rate systems, ultra‐dense networks (UDNs) are considered as a solution by deploying multiple small cell base stations (SBSs) in the traditional macrocell base station (MBS) [1], the coverage and throughput of the whole system can be improved significantly. In such network infrastructures, there are important links, namely backhaul, which connect the core network with multiple SBSs [2]. In the traditional cellular systems, wired backhaul is mostly used since it has high reliability communication. However, deploying wired backhaul in the large‐scale systems would lead to an increase in the cost of maintenance services. As a result, wireless backhaul has been focused as an alternative solution to offer cost‐efficiency and flexibility [3]. Even though wireless backhaul has shown many advantages compared to wired backhaul, its reliability could not fully be achieved due to the nature of broadcasting and propagation effects [4] ...