supported by the NSI. Similarly, the NSSI NRM includes: The list of the component NFs and/or the list of constituent NSSIs; The list of service profiles supported by the NSI. The following information is included in the service profile: Extensive set perfReq of attributes representing the performance requirements. NSI (NSSI) capacity specifications such as maximum number of UEs (maxNumberofUEs) that the NSI should support. NSI availability. UE mobility level. The coverage provided by the NSI, specified in the format of the list of tracking areas. QoS properties, which may include indicators like E2E latency, along with such require- ments as experienced data rate, area traffic capacity (density), and the information of the UE density. The set of QoS properties may differ from those of the standardized scenarios of eMBB, URLLC, and mloT. 6.5.9 SON in 5G 6.5.9.1 SON Evolution Similarly to 4G, 5G supports SON functionality. SON functionality is often categorized as distributed SON (D-SON), carried out by NG-RAN nodes using control-plane messages, for example, Xn-AP, and centralized SON (C-SON), managed by OAM. C-SON is a closed loop optimization process, which performs collection of network performance data, anal- yses, and potentially network node reconfiguration, with the goal of improving network performance. In the current section we focus on C-SON, as it is performed by OAM. 6.5 Operations, Administration, and Management 5G SON contains similar functionality to that of 4G, which has evolved to address new features introduced in NG-RAN and NR. Furthermore, in contrast to 4G SON, in 5G the SON capabilities are extended to optimization of the E2E service quality indicators, in both slicing and non-slicing scenarios. There are multiple aspects in 5G that require additional efforts compared with 4G for network automation, specifically: Increased network densification Challenging QoS requirements Complex radio technology Slicing New RAN architecture options. As mentioned in Chapter 2, 5G network deployments are likel