  The rapid involution of the mobile generation with incipient data networking
capabilities and utilization has exponentially increased the data traffic
volumes. Such traffic drains various key issues in 5G mobile backhaul networks.
Security of mobile backhaul is of utmost importance; however, there are a
limited number of articles, which have explored such a requirement. This paper
discusses the potential design issues and key challenges of the secure 5G
mobile backhaul architecture. The comparisons of the existing state-of-the-art
solutions for secure mobile backhaul, together with their major contributions
have been explored. Furthermore, the paper discussed various key issues related
to Quality of Service (QoS), routing and scheduling, resource management,
capacity enhancement, latency, security-management, and handovers using
mechanisms like Software Defined Networking and millimeter Wave technologies.
Moreover, the trails of research challenges and future directions are
additionally presented.
