sources. In addition to increased flexibility and optimization, a 5G system needs to support stringent key performance indicators (KPIs) for latency, reliability, throughput, etc. Enhancements in the radio access network contribute to meeting these KPIs as do core network improvements such as network slicing, in-network caching, and hosting services closer to the end nodes [21]. Flexible network operations are the cornerstone of the 5G systems and the new features that allow this flexibility include NFV, network slicing, SDN, network scalability, and seamless mobility. Other network operational requirements address the indispensable control and data plane resource allocation efficiencies as well as network configurations that optimize service delivery by adopting optimal routing strategies between end users and application servers. Enhanced charging and security mechanisms manage new types of UEs connecting to the network in different ways. The enhancements in mobile broadband access mechanisms aim to meet a number of new KPIs, which pertain to high data rates, high user density, high user mobility, highly variable data rates, flexible deployment options, and improved coverage. High data rates are driven by the increasing use of data for services such as streaming (e.g., video, music, and user generated content), interactive services (e.g., augmented reality), and some IoT use cases. The availability of these services impose stringent requirements on user experienced data rates and latency in order to meet certain QoS requirements. In addition, increased coverage in densely populated areas such as sport arenas, urban areas, and transportation hubs has become an essential demand for pedestrians and users in vehicles. New KPIs related to traf- fic and connection density enable transport of high volume of user traffic per area (traffic density) and transport of data for high number of connections (UE density or connection density). Many UEs are expected to support a variety of services which exchange either a very l