he purpose of provision of new services with desired cost and quality. However, for support of the existing as well as emerging new services IMT-2020 requires management and orchestration for IMT 2020 mobile networks. The term orchestration refers to automated arrangement, coor- dination, instantiation, and use of network functions and resources for both physical and virtual infrastructures by optimization criteria [14]. 5 QoS for Mobile Ultra-Broadband Services Services #1 (eMBB) Services Services Services #2 (mloT) #3 (URLLC) Per network slice management Access Mobile core Cloud-based network network services slice Physical link resources (e.g., VLAN, IP tunnel) Transport resources Storage Computing resources resources Physical infrastructure eMBB - enhanced mobile broadband mloT - massive Internet of Things URLLC - Ultra-reliable low latency communications Figure 5.11 Network slicing for IMT-2020. Generally, network virtualization based on software defined networking (SDN), network function virtualization (NFV), and cloud computing technologies contributes to the IMT-2020 framework [15] by use of software for mobile network design, imple- mentation, deployment, management, and maintenance. With such virtualization, the underlying physical infrastructure is abstracted as network, storage, or computing resources. The main logical building blocks in IMT-2020 are network slices. By one definition [14], a network slice in IMT-2020 is a logical network that provides certain specific capabilities and characteristics for a given mobile services market scenario (Figure 5.11). There are different possible uses of network softwarization in IMT-2020. For example, video traffic is becoming the dominant type of traffic which shows a continuously increasing trend [15]. However, in certain regions disaster resilience is very important (e.g. due to hurricane disasters, floods, earthquakes), where IMT-2020 offers the possi- bility to be used as the first option for communication. Softwarization may contribute 5.7 QoS in 5G Mobi